CN115363667A - Support frame - Google Patents

Support frame Download PDF

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Publication number
CN115363667A
CN115363667A CN202210485907.6A CN202210485907A CN115363667A CN 115363667 A CN115363667 A CN 115363667A CN 202210485907 A CN202210485907 A CN 202210485907A CN 115363667 A CN115363667 A CN 115363667A
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CN
China
Prior art keywords
annular
shaped
stent
waveform
body portion
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Pending
Application number
CN202210485907.6A
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Chinese (zh)
Inventor
崔亚飞
王格
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Shanghai Li Kai Technology Co ltd
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Shanghai Li Kai Technology Co ltd
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Application filed by Shanghai Li Kai Technology Co ltd filed Critical Shanghai Li Kai Technology Co ltd
Priority to CN202210485907.6A priority Critical patent/CN115363667A/en
Priority to CN202310679147.7A priority patent/CN116672021B/en
Publication of CN115363667A publication Critical patent/CN115363667A/en
Pending legal-status Critical Current

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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/12—Surgical instruments, devices or methods, e.g. tourniquets for ligaturing or otherwise compressing tubular parts of the body, e.g. blood vessels, umbilical cord
    • A61B17/12022—Occluding by internal devices, e.g. balloons or releasable wires
    • A61B17/12099—Occluding by internal devices, e.g. balloons or releasable wires characterised by the location of the occluder
    • A61B17/12109—Occluding by internal devices, e.g. balloons or releasable wires characterised by the location of the occluder in a blood vessel
    • A61B17/12113—Occluding by internal devices, e.g. balloons or releasable wires characterised by the location of the occluder in a blood vessel within an aneurysm
    • A61B17/12118—Occluding by internal devices, e.g. balloons or releasable wires characterised by the location of the occluder in a blood vessel within an aneurysm for positioning in conjunction with a stent
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/12—Surgical instruments, devices or methods, e.g. tourniquets for ligaturing or otherwise compressing tubular parts of the body, e.g. blood vessels, umbilical cord
    • A61B17/12022—Occluding by internal devices, e.g. balloons or releasable wires
    • A61B17/12131—Occluding by internal devices, e.g. balloons or releasable wires characterised by the type of occluding device
    • A61B17/12168—Occluding by internal devices, e.g. balloons or releasable wires characterised by the type of occluding device having a mesh structure
    • A61B17/12172—Occluding by internal devices, e.g. balloons or releasable wires characterised by the type of occluding device having a mesh structure having a pre-set deployed three-dimensional shape
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/12—Surgical instruments, devices or methods, e.g. tourniquets for ligaturing or otherwise compressing tubular parts of the body, e.g. blood vessels, umbilical cord
    • A61B17/12022—Occluding by internal devices, e.g. balloons or releasable wires
    • A61B17/12131—Occluding by internal devices, e.g. balloons or releasable wires characterised by the type of occluding device
    • A61B17/12168—Occluding by internal devices, e.g. balloons or releasable wires characterised by the type of occluding device having a mesh structure
    • A61B17/12177—Occluding by internal devices, e.g. balloons or releasable wires characterised by the type of occluding device having a mesh structure comprising additional materials, e.g. thrombogenic, having filaments, having fibers or being coated
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/82—Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/86—Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure
    • A61F2/90—Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure characterised by a net-like or mesh-like structure
    • A61F2/91—Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure characterised by a net-like or mesh-like structure made from perforated sheet material or tubes, e.g. perforated by laser cuts or etched holes
    • A61F2/915—Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure characterised by a net-like or mesh-like structure made from perforated sheet material or tubes, e.g. perforated by laser cuts or etched holes with bands having a meander structure, adjacent bands being connected to each other
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B2017/00831—Material properties
    • A61B2017/00902—Material properties transparent or translucent
    • A61B2017/00915—Material properties transparent or translucent for radioactive radiation
    • A61B2017/0092—Material properties transparent or translucent for radioactive radiation for X-rays
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/82—Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/86—Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure
    • A61F2/90—Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure characterised by a net-like or mesh-like structure
    • A61F2/91—Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure characterised by a net-like or mesh-like structure made from perforated sheet material or tubes, e.g. perforated by laser cuts or etched holes
    • A61F2/915—Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure characterised by a net-like or mesh-like structure made from perforated sheet material or tubes, e.g. perforated by laser cuts or etched holes with bands having a meander structure, adjacent bands being connected to each other
    • A61F2002/9155—Adjacent bands being connected to each other
    • A61F2002/91575—Adjacent bands being connected to each other connected peak to trough
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2250/00—Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
    • A61F2250/0058—Additional features; Implant or prostheses properties not otherwise provided for
    • A61F2250/0096—Markers and sensors for detecting a position or changes of a position of an implant, e.g. RF sensors, ultrasound markers
    • A61F2250/0098—Markers and sensors for detecting a position or changes of a position of an implant, e.g. RF sensors, ultrasound markers radio-opaque, e.g. radio-opaque markers

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  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Surgery (AREA)
  • Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Animal Behavior & Ethology (AREA)
  • Veterinary Medicine (AREA)
  • Vascular Medicine (AREA)
  • Public Health (AREA)
  • Heart & Thoracic Surgery (AREA)
  • General Health & Medical Sciences (AREA)
  • Molecular Biology (AREA)
  • Medical Informatics (AREA)
  • Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
  • Reproductive Health (AREA)
  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Cardiology (AREA)
  • Oral & Maxillofacial Surgery (AREA)
  • Transplantation (AREA)
  • Neurosurgery (AREA)
  • Prostheses (AREA)
  • Media Introduction/Drainage Providing Device (AREA)

Abstract

A stent includes a proximal portion, a first body portion, an intermediate portion, a second body portion, and a distal portion; the proximal portion, the first main body portion, the middle portion, the second main body portion and the distal portion are all formed by annular waveform supporting rods, the first main body portion and the second main body portion are all formed by first annular waveform supporting rods and second annular waveform supporting rods which are alternately arranged, and the first annular waveform supporting rods and the second annular waveform supporting rods are all in Z-shaped waveforms; the length of the Z-shaped waveform of the first annular waveform supporting rod in the axial direction is greater than that of the Z-shaped waveform of the second annular waveform supporting rod in the axial direction; the intermediate portion is provided with a development mark. The stent has higher radial supporting force, can greatly enhance the flexibility and the expansion performance of the stent and improve the overbending performance of the stent, and has simple structure and easy implementation; and facilitates the determination of the specific position of the middle portion of the stent after the stent is completely released.

Description

Support frame
Technical Field
The invention relates to the field of nerve intervention, in particular to a stent.
Background
The treatment of cerebral vascular hemorrhage generally selects to use a dense mesh stent to reconstruct blood flow guide or an auxiliary stent to assist the spring ring embolization treatment, and the common operation strategy is to establish a passage, then convey devices such as the stent or the spring ring to a lesion part, push out the stent or the spring ring, block the lesion vascular aneurysm and complete the operation. The auxiliary support spring ring embolism treatment is a common treatment mode, the requirement on the support is high, the support needs to have enough flexibility and good adherence performance, and the support needs to be visible under X-rays, so that an operator can conveniently judge the opening state of the support.
Disclosure of Invention
The present invention provides a stent comprising a proximal portion, a first body portion, an intermediate portion, a second body portion and a distal portion connected in series from a proximal end to a distal end; wherein the proximal portion, the first body portion, the intermediate portion, the second body portion, and the distal portion are each comprised of a looped, wave-shaped strut; the first main body part and the second main body part are both composed of first annular waveform supporting rods and second annular waveform supporting rods which are alternately arranged, the first annular waveform supporting rods and the second annular waveform supporting rods are both in a Z-shaped waveform, and the Z-shaped waveform comprises a plurality of V-shaped structures; the length of the Z-shaped waveform of the first annular waveform supporting rod in the axial direction is greater than that of the Z-shaped waveform of the second annular waveform supporting rod in the axial direction; the intermediate portion is provided with a development mark. By utilizing the stent, the length of the Z-shaped waveform of the first annular waveform supporting rod in the axial direction is greater than that of the Z-shaped waveform of the second annular waveform supporting rod in the axial direction, so that the stent has higher radial supporting force, the flexibility and the expansion performance of the stent can be greatly enhanced, the overbending performance of the stent is improved, and meanwhile, the stent is simple in structure and easy to implement; and the middle part is provided with a developing mark, which is beneficial to determining the specific position of the middle part of the bracket after the bracket is completely released.
In one embodiment, the middle portion includes two first annular corrugated support rods and a part of the V-shaped structure of the middle portion is replaced by a Y-shaped structure having a rod-shaped fixing portion parallel to the axial direction of the stent, the fixing portion having a development mark disposed thereon. With this embodiment, the rod-like fixing portion of the Y-shaped structure provides a fixing position for the development marker, facilitating the mounting and fixing of the development marker.
In one embodiment, a connection point of the middle portion is formed where the tip of the V-shaped structure of the first annular wave shaped support rod of the middle portion adjoining the first body portion meets the tip of the V-shaped structure of the first annular wave shaped support rod of the middle portion adjoining the second body portion. Through the embodiment, the middle part has enough supporting force, the supporting force is not too large, and the flexibility of the support is ensured.
In one embodiment, the plurality of the Y-shaped structures of the fixing portion of the Y-shaped structure are uniformly distributed along the circumferential direction and the free ends of the fixing portions of the Y-shaped structures are directed to the second body portion, and the plurality of the Y-shaped structures of the fixing portion of the Y-shaped structure are uniformly distributed along the circumferential direction and the free ends of the fixing portions of the Y-shaped structure are directed to the first body portion; the free end of the fixed portion of the first annular wave shaped support rod whose intermediate portion abuts the first body portion is axially spaced apart from the free end of the fixed portion of the first annular wave shaped support rod whose intermediate portion abuts the second body portion. By this embodiment, the development marks 9 are advantageously distributed evenly in the middle part 14 of the stent, which facilitates the development marks to clearly identify the open state of the middle part of the stent after the stent is completely released; and when the support is in a compressed state, the radial volume of the support can be reduced, and the pushing resistance is reduced.
In one embodiment, each of the Y-shaped structures of the first annular corrugated strut of the first body portion to which the intermediate portion adjoins is circumferentially staggered from each of the Y-shaped structures of the first annular corrugated strut of the second body portion to which the intermediate portion adjoins; and the included angle of the circle centers corresponding to the two adjacent Y-shaped structures is a fixed value. By the embodiment, when the stent is in a compressed state, the radial volume of the stent can be reduced, and the pushing resistance is reduced; the visualization marker facilitates the operator in locating the position of the middle portion of the stand after it is opened.
In one embodiment, each of the Y-shaped structures of the first annular corrugated strut of the first body portion to which the intermediate portion adjoins is respectively disposed collinearly with each of the Y-shaped structures of the first annular corrugated strut of the second body portion to which the intermediate portion adjoins. The developing mark can be fixed more conveniently and more easily, and the developing mark can be observed and positioned more easily.
In one embodiment, the first annular wave shaped support bar of the intermediate portion adjoining the first body portion and the first annular wave shaped support bar of the intermediate portion adjoining the second body portion each comprise two of the Y-shaped structures. By the embodiment, the development marks are sufficiently arranged, so that the development marks can clearly identify the opening state of the middle part of the bracket after the bracket is completely released.
In one embodiment, the density of the zigzag waveform of the first annular corrugated support rod in the circumferential direction is smaller than the density of the zigzag waveform of the second annular corrugated support rod in the circumferential direction. Through this embodiment, the density of the Z-shaped waveform of the second annular waveform supporting rod in the circumferential direction is small, which is beneficial to improving the expansion performance of the stent.
In one embodiment, a connection point is formed between the first and second annular waveform support rods, and the connection point is located where a trough of the Z-shaped waveform of the first annular waveform support rod meets a peak of the Z-shaped waveform of the second annular waveform support rod and where a peak of the Z-shaped waveform of the first annular waveform support rod meets a trough of the Z-shaped waveform of the second annular waveform support rod. Through this embodiment, the support both had sufficient holding power, and the holding power can not be too big, simultaneously, has guaranteed the compliance of support.
In one embodiment, the proximal portion comprises two of the first annular wave-shaped support rods axially juxtaposed or the proximal portion comprises two of the second annular wave-shaped support rods axially juxtaposed; and/or the distal end portion comprises two first annular wave-shaped supporting rods which are axially distributed in parallel, or the distal end portion comprises two second annular wave-shaped supporting rods which are axially distributed in parallel. By this embodiment, the proximal and distal portions are advantageously formed into a closed loop design, which effectively prevents the free end from puncturing the vessel wall.
In one embodiment, the proximal portion comprises two of the first annular corrugated struts axially juxtaposed, the first body portion being connected to the proximal portion by second annular corrugated struts; the proximal part comprises two second annular waveform supporting rods which are axially distributed in parallel, and the first main body part is connected with the proximal part through the first annular waveform supporting rods; the distal end part comprises two first annular corrugated supporting rods which are axially distributed in parallel, and the second main body part is connected with the distal end part through second annular corrugated supporting rods; the distal end portion comprises two second annular waveform supporting rods which are axially distributed in parallel, and the second main body portion is connected with the distal end portion through the first annular waveform supporting rods. With this embodiment, the formation of a tapered mouth is facilitated by the fact that there are fewer attachment points for the proximal portion to the first body portion and fewer attachment points for the distal portion to the second body portion.
In one embodiment, the junction of the proximal portion and the first body portion forms a tapered opening after deployment of the stent, the generatrix of the tapered opening being at an angle of 30 to 60 degrees from the axis; the junction of the distal portion and the second body portion forms a tapered opening after the stent is deployed, and the included angle between the generatrix of the tapered opening and the axis is 30-60 degrees. Through this embodiment, set up the bell mouth that expands outward, can promote the radial holding power at support both ends, can effectively solve the displacement problem that produces by blood flow impact in the support revascularization.
In one embodiment, a fixation rod is disposed on the first or second looped undulating support rod distal to the proximal end portion of the first body portion or distal to the distal end portion of the second body portion; at the distal end portion, the fixation rod extends from a peak of the Z-shaped waveform of the first or second annular waveform support rods; at the proximal end portion, the fixation rod extends from a trough of a Z-shaped waveform of the first or second annular waveform strut; the fixing rods are uniformly distributed along the circumferential direction; the fixed rod is provided with a developing mark. With this embodiment, the distal and proximal portions of the stent can be effectively positioned by the visualization markers.
In one embodiment, each of the proximal portion or the distal portion comprises four of the fixation rods. With this embodiment, having sufficient visualization indicia facilitates a clear indication of the open state of the proximal and distal portions of the stent after the stent has been fully released.
In one embodiment, the visualization marker is a radiopaque spring or a visualization metal ring, and the visualization marker is fixed to the stent by laser welding or spot gluing. Through the embodiment, the developing mark can be firmly fixed on the bracket, and the safety performance of the bracket is improved.
In one embodiment, the stent is formed by laser cutting an alloy tube. By this embodiment, the manufacturing of the stent is facilitated.
The application provides a support, compare in prior art, has following beneficial effect.
1. Utilize this support, the ascending length of Z shape wave form of the annular wave form bracing piece of first ring shape is greater than the ascending length of Z shape wave form of the annular wave form bracing piece of second in the axial, and the mid portion is provided with the development mark, thereby make the support have higher radial holding power, and can strengthen the compliance and the expansion performance of support greatly, and improve the overbending performance of support, simple structure, easy to carry out simultaneously, and be favorable to after the support releases completely, confirm the concrete position of the mid portion of support.
2. The fixing part and the fixing rod are arranged to be beneficial to fixing the developing mark.
3. The free end of the fixing part of the first annular waveform supporting rod of which the middle part is adjacent to the first main body part and the free end of the fixing part of the first annular waveform supporting rod of which the middle part is adjacent to the second main body part are axially spaced, so that the development marks are uniformly distributed in the middle of the bracket, and the development marks clearly identify the opening state in the middle of the bracket after the bracket is completely released; and when the support is in a compressed state, the radial volume of the support can be reduced, and the pushing resistance is reduced.
The technical features mentioned above can be combined in various suitable ways or replaced by equivalent technical features as long as the purpose of the invention can be achieved.
Drawings
The present invention will become more fully understood from the detailed description given herein below and the accompanying drawings, wherein like elements are numbered alike, and wherein:
FIG. 1 shows a schematic view of a stent in a planar expanded state according to an embodiment of the present invention;
FIG. 2 is a schematic view of a stent having a development mark according to an embodiment of the present invention, the stent being in a planar expanded state;
FIG. 3 is a schematic view showing a structure of a stent having a development mark according to an embodiment of the present invention, the stent being in a three-dimensional state;
FIG. 4 shows a schematic structural view of a stent according to another embodiment of the present invention, the stent being in a planar expanded state;
FIG. 5 shows a schematic view of a stent structure with visualization markers according to another embodiment of the present invention, the stent being in a planar expanded state;
FIG. 6 shows the stent in DAS pass mode with the visualization markers in the middle of the stent positioned at the ostium positions;
FIG. 7 shows the stent in DAS imaging mode with the stent fully released and the visualization markers clearly identifying the open state of the stent;
figure 8 shows that at a bend radius of 4 mm, the scaffold has excellent adhesion properties;
fig. 9 is a schematic view showing the structure of a stent according to still another embodiment of the present invention, which is in a planar expanded state, and a groove-like structure is provided on a fixing rod of a proximal portion of the stent.
List of reference numerals:
1-a proximal portion; 2-a first body portion; 3-a second body portion; 4-a distal portion; 5-a first annular wave-shaped support rod; 6-second annular waveform supporting rod; 7-V-shaped structure; 8-Y-shaped structure; 9-development marking; 10-a fixed part; 11-a fixing bar; 12-a cone-shaped mouth; 13-a trough-like structure; 14-middle part.
Detailed Description
The technical solution of the present invention will be described in further detail below with reference to the following examples and drawings, but the present invention is not limited to the following examples.
The proximal portion 1 of the present invention refers to the end of the stent close to the operator after the stent is implanted in the blood vessel, and the distal portion 4 is the end far from the operator. In fig. 1 to 5, the proximal end portion 1 is disposed on the right side of the stent, and the distal end portion 4 is disposed on the left side of the stent. The definition of peaks and valleys is: the near end of the support is used as an original point, the axial direction of the support is taken as the positive axial direction from the near end to the far end of the support, and the coordinates of the wave crests of the same annular waveform support rod are larger than the coordinates of the wave troughs of the same annular waveform support rod.
As shown in fig. 1 to 5, the present embodiment provides a stent including a proximal end portion 1, a first body portion 2, an intermediate portion 14, a second body portion 3, and a distal end portion 4 connected in this order from the proximal end to the distal end; wherein the proximal portion 1, the first body portion 2, the intermediate portion 14, the second body portion 3 and the distal portion 4 are each formed of a looped corrugated strut rod; the first main body part 2 and the second main body part 3 are both composed of first annular waveform supporting rods 5 and second annular waveform supporting rods 6 which are alternately arranged, the first annular waveform supporting rods 5 and the second annular waveform supporting rods 6 are both Z-shaped waveforms, and each Z-shaped waveform comprises a plurality of V-shaped structures 7; the length of the Z-shaped waveform of the first annular waveform supporting rod 5 in the axial direction is greater than that of the Z-shaped waveform of the second annular waveform supporting rod 6 in the axial direction; the intermediate portion 14 is provided with a development mark 9.
The first and second annular waveform support rods 5 and 6 have substantially the same waveform, i.e., the ratio of the wavelength to the amplitude is constant, but the length of the Z-shaped waveform of the first annular waveform support rod 5 in the axial direction is greater than the length of the Z-shaped waveform of the second annular waveform support rod 6 in the axial direction, i.e., the first annular waveform support rod 5 has a greater amplitude than the second annular waveform support rod 6, and accordingly, the first annular waveform support rod 5 has a longer wavelength than the second annular waveform support rod 6.
Optionally, the ratio of the wavelength of the first annular waveform support rod 5 to the wavelength of the second annular waveform support rod 6 is 3 to 2, that is, the total wavelength of the two V-shaped structures 7 of the first annular waveform support rod 5 is equal to the total wavelength of the 3V-shaped structures 7 of the second annular waveform support rod 6. Optionally, the first annular waveform supporting rod 5 includes 8V-shaped structures 7, and the second annular waveform supporting rod 6 includes 12V-shaped structures 7, and since the ratio of the wavelength of the first annular waveform supporting rod 5 to the wavelength of the second annular waveform supporting rod 6 is 3 to 2, the total length of the first annular waveform supporting rod 5 in the circumferential direction and the radial direction is equal to the total length of the second annular waveform supporting rod 6 in the circumferential direction and the radial direction, that is, the total wavelength of the first annular waveform supporting rod 5 is equal to the total wavelength of the second annular waveform supporting rod 6.
In the axial direction, the number of the annular waveform supporting rods forming the bracket is set according to actual needs, and the first main body part and the second main body part can comprise the same number of annular waveform supporting rods or different numbers of annular waveform supporting rods; alternatively, as shown in fig. 1, the first main body part 2 and the second main body part 3 of the stent may each include 6 annular waveform supporting rods, wherein there are 3 first annular waveform supporting rods 5 and 3 second annular waveform supporting rods 6 in the 6 annular waveform supporting rods.
Optionally, the cross-sectional dimension of the first annular corrugated strut bar 5 is larger than the cross-sectional dimension of the second annular corrugated strut bar 6, that is, the second annular corrugated strut bar 6 is thinner than the first annular corrugated strut bar 5.
The first main body part 2 and the second main body part 3 are respectively composed of a first annular waveform supporting rod 5 and a second annular waveform supporting rod 6 which are alternately arranged, and the first annular waveform supporting rod 5 and the second annular waveform supporting rod 6 are alternately arranged, so that the axial connection strength and the radial supporting force are ensured to be uniformly distributed along the axial direction, and the support is uniformly deformed when being stretched or bent; meanwhile, the length of the second annular waveform supporting rod 6 in the axial direction is smaller, so that the stent has higher flexibility, expansion performance and bending performance compared with a stent completely composed of the first annular waveform supporting rods 5; moreover, the second annular waveform supporting rod 6 is thinner than the first annular waveform supporting rod 5, so that the stent is easier to stretch at the second annular waveform supporting rod 6, and compared with the stent which is completely composed of the first annular waveform supporting rod 5, the stent has better expansion performance; the sectional dimension of the first annular wavy support rod 5 is larger than that of the second annular wavy support rod 6, so that the stent has larger radial supporting force at the first annular wavy support rod 5, and compared with the stent which is entirely composed of the second annular wavy support rod 6, the overall radial supporting force of the stent is larger.
Meanwhile, the support is simple in structure and easy to implement.
The middle part 14 of the stent is provided with a development mark 9, thereby being beneficial to determining the specific position of the middle part 14 of the stent after the stent is completely released.
By utilizing the stent, the length of the Z-shaped waveform of the first annular waveform supporting rod 5 in the axial direction is greater than that of the Z-shaped waveform of the second annular waveform supporting rod 6 in the axial direction, so that the stent has higher radial supporting force, the flexibility and the expansion performance of the stent can be greatly enhanced, the overbending performance of the stent is improved, and meanwhile, the stent is simple in structure and easy to implement; the intermediate portion 14 is provided with a visualization marker to facilitate the determination of the specific location of the intermediate portion 14 of the stent after the stent has been fully released.
In one embodiment, the middle portion 14 comprises two first annular wave-shaped support rods 5 and part of the V-shaped structure 7 of the middle portion 14 is replaced by a Y-shaped structure 8, the Y-shaped structure 8 has a rod-shaped fixing portion 10 parallel to the axial direction of the stent, and the fixing portion 10 is provided with development marks 9.
With this embodiment, the rod-like fixing portion 10 of the Y-shaped structure 8 provides a fixing position for the development marks 9, facilitating the mounting and fixing of the development marks 9.
In one embodiment, the connection point of the middle portion 14 is formed where the tip of the V-shaped structure 7 of the first annular corrugated strut 5 of the middle portion 14 adjacent to the first body portion 2 meets the tip of the V-shaped structure 7 of the first annular corrugated strut 5 of the middle portion 14 adjacent to the second body portion 3.
The Y-shaped formations 8 are all of an open loop configuration, i.e. the rod-like fixed part 10 of the Y-shaped formation 8 of the first annular wave shaped support rod 5 with the intermediate part 14 adjacent the first body part 2 has a free end towards the second body part 3, and the rod-like fixed part 10 of the Y-shaped formation 8 of the first annular wave shaped support rod 5 with the intermediate part 14 adjacent the second body part 3 has a free end towards the first body part 2.
Part of the V-shaped structures 7 are open-loop structures, and the rest of the V-shaped structures 7 are closed-loop structures.
When the V-shaped structure 7 of the first annular corrugated supporting rod 5 of the middle part 14 adjacent to the first main body part 2 is arranged adjacent to the Y-shaped structure 8 of the first annular corrugated supporting rod 5 of the middle part 14 adjacent to the second main body part 3, the V-shaped structure 7 is an open-loop structure, i.e. the top end of the V-shaped structure 7 is not connected with other parts of the bracket; when the V-shaped structure 7 of the first annular wave shaped support rod 5 of the middle portion 14 adjoining the first body portion 2 is disposed adjacent to the V-shaped structure 7 of the first annular wave shaped support rod 5 of the middle portion 14 adjoining the second body portion 3, the V-shaped structure 7 is a closed loop structure, i.e. the top end of the V-shaped structure 7 is connected with other parts of the stent.
Similarly, when the V-shaped structure 7 of the first annular wave shaped support rod 5 of the middle portion 14 adjoining the second body portion 3 is disposed adjacent to the Y-shaped structure 8 of the first annular wave shaped support rod 5 of the middle portion 14 adjoining the first body portion 2, the V-shaped structure 7 is an open loop structure, i.e. the tip of the V-shaped structure 7 is not connected with other parts of the stent; when the V-shaped structure 7 of the first annular wave shaped support rod 5 of the middle portion 14 adjoining the second body portion 3 is disposed adjacent to the V-shaped structure 7 of the first annular wave shaped support rod 5 of the middle portion 14 adjoining the first body portion 2, the V-shaped structure 7 is a closed loop structure, i.e. the top end of the V-shaped structure 7 is connected with other parts of the stent.
The closed loop V-shaped configuration 7 of the intermediate portion 14 provides sufficient support for the stent; the V-shaped structure 7 and the Y-shaped structure 8 of the open ring can effectively avoid overlarge supporting force, and the flexibility of the support is ensured due to the fact that the bending freedom degree of the support is large.
By this embodiment, the middle portion 14 has both sufficient support force without excessive support force and ensures the flexibility of the stent.
In one embodiment, as shown in fig. 1 to 5, the plurality of Y-shaped structures 8 of the first annular wave shaped support rod 5 of the intermediate portion 14 adjoining the first body portion 2 are evenly distributed in the circumferential direction and the free ends of the fixing portions 10 of the Y-shaped structures 8 are directed to the second body portion 3, the plurality of Y-shaped structures 8 of the first annular wave shaped support rod 5 of the intermediate portion 14 adjoining the second body portion 3 are evenly distributed in the circumferential direction and the free ends of the fixing portions 10 of the Y-shaped structures 8 are directed to the first body portion 2; the free end of the fixed portion 10 of the first annular wave shaped support rod 5 of the intermediate portion 14 adjoining the first body portion 2 is axially spaced from the free end of the fixed portion 10 of the first annular wave shaped support rod 5 of the intermediate portion 14 adjoining the second body portion 3.
The free end of the fixed portion 10 of the first annular wave support rod 5 of which the intermediate portion 14 abuts against the first body portion 2 is axially spaced from the free end of the fixed portion 10 of the first annular wave support rod 5 of which the intermediate portion 14 abuts against the second body portion 3, that is, the length of the Y-shaped structure 8 of the first annular wave support rod 5 in the axial direction is equal to or less than the length of the V-shaped structure 7 of the first annular wave support rod 5 in the axial direction so as to achieve the spaced free ends, and it is avoided that the fixed portion 10 of the first annular wave support rod 5 of which the intermediate portion 14 abuts against the first body portion 2 and the fixed portion 10 of the first annular wave support rod 5 of which the intermediate portion 14 abuts against the second body portion 3 are positionally overlapped in the axial direction, so that the development mark 9 of the first body portion 2 and the development mark 9 of the second body portion 3 are misaligned in the axial direction, so that, in a compressed state, the overall length of the intermediate portion is twice the length of the development mark 9. Twice the length, which is beneficial for the operator to observe better.
More importantly, the free end of the fixing part 10 of the first annular wave-shaped support rod 5 of the middle part 14 adjacent to the first main body part 2 is axially spaced from the free end of the fixing part 10 of the first annular wave-shaped support rod 5 of the middle part 14 adjacent to the second main body part 3, so that the developing marks 9 of the first annular wave-shaped support rod 5 of the middle part 14 adjacent to the first main body part 2 are axially spaced from the developing marks 9 of the first annular wave-shaped support rod 5 of the middle part 14 adjacent to the second main body part 3, and when the stent is in a compressed state, the radial volume of the stent can be reduced, and the pushing resistance can be reduced.
By this embodiment, the development marks 9 are advantageously evenly distributed in the middle part 14 of the stent, and the development marks 9 clearly identify the open state of the middle part of the stent after the stent is completely released; and when the support is in a compressed state, the radial volume of the support can be reduced, and the pushing resistance is reduced.
In one embodiment, as shown in fig. 1 to 3, each Y-shaped structure 8 of the first annular wave-shaped support rod 5 of which the middle portion 14 is adjacent to the first body portion 2 is circumferentially staggered from each Y-shaped structure 8 of the first annular wave-shaped support rod 5 of which the middle portion 14 is adjacent to the second body portion 3; the included angle between the centers of circles corresponding to two adjacent Y-shaped structures 8 is a fixed value, wherein the two adjacent Y-shaped structures 8 respectively belong to two first annular waveform support rods 5 of the middle part 14.
The Y-shaped structures 8 arranged in a staggered mode can reduce pushing resistance. Meanwhile, in the compressed state, since the development marks 9 of the first annular wave-shaped support rod 5 of which the middle portion 14 abuts against the first body portion 2 and the development marks 9 of the first annular wave-shaped support rod 5 of which the middle portion 14 abuts against the second body portion 3 are not overlapped in the axial direction, the middle portion overall radiopaque length is twice as long as the development marks 9, and the length is twice, which is beneficial for the operator to observe better. The visualization marker 9 facilitates the operator to locate the position of the stand after it has been opened. ' Qiyi
By the embodiment, when the stent is in a compressed state, the radial volume of the stent can be reduced, and the pushing resistance is reduced; the visualization marker 9 facilitates the operator to locate the position of the middle part 14 of the stand after it has been opened.
In one embodiment, as shown in fig. 4 and 5, each of the Y-shaped structures 8 of the first looped corrugated strut 5 having the intermediate portion 14 adjacent to the first body portion 2 is respectively disposed in line with each of the Y-shaped structures 8 of the first looped corrugated strut 5 having the intermediate portion 14 adjacent to the second body portion 3.
In the compressed state, since the development marks 9 of the first annular wave-shaped support rod 5 of which the intermediate portion 14 abuts the first body portion 2 and the development marks 9 of the first annular wave-shaped support rod 5 of which the intermediate portion 14 abuts the second body portion 3 are not overlapped in the axial direction, the middle portion overall radiopaque length is twice as long as the development marks 9, and the length is twice as long, which is advantageous for the operator to view better.
The co-linear arrangement of the Y-shaped structures 8 facilitates more convenient fixing of the development marks 9.
Alternatively, as shown in fig. 5, two development marks 9 arranged in line may be formed as a single body, thereby facilitating easier observation and positioning of the development marks 9.
With this embodiment, it is advantageous to fix the development mark 9 more conveniently, and to make the development mark 9 easier to observe and position.
In one embodiment, as shown in fig. 1 to 3, the first annular wave shaped support rod 5 of which the middle portion 14 adjoins the first body portion 2 and the first annular wave shaped support rod 5 of which the middle portion 14 adjoins the second body portion 3 each include two Y-shaped structures 8.
The middle portion 14 is disposed 180 degrees apart adjacent to the two Y-shaped structures 8 of the first annular wave shaped support rod 5 of the first body portion 2, and the middle portion 14 is disposed 180 degrees apart adjacent to the two Y-shaped structures 8 of the first annular wave shaped support rod 5 of the second body portion 2. The middle part 14 is provided with 3V-shaped structures 7 between the two Y-shaped structures 8 of the first annular wavy support rod 5 adjacent to the first body part 2; and the middle portion 14 has 3V-shaped structures 7 between the two Y-shaped structures 8 of the first annular wave shaped support rod 5 adjacent to the second body portion 3.
Optionally, each Y-shaped structure 8 of the first annular corrugated supporting rod 5, which is adjacent to the first main body part 2 through the middle part 14, is staggered with each Y-shaped structure 8 of the first annular corrugated supporting rod 5, which is adjacent to the second main body part 3 through the middle part 14, and the included angle between the centers of the two adjacent Y-shaped structures 8 is 90 degrees, wherein each two adjacent Y-shaped structures 8 includes one V-shaped structure 7, which is adjacent to the first annular corrugated supporting rod 5 of the first main body part 2 through the middle part 14, and one V-shaped structure 7, which is adjacent to the first annular corrugated supporting rod 5 of the second main body part 3 through the middle part 14, and one V-shaped structure 7, which is adjacent to the first annular corrugated supporting rod 5 of the first main body part 2 through the middle part 14, and one V-shaped structure 7, which is adjacent to the first annular corrugated supporting rod 5 of the second main body part 3 through the middle part 14, are disposed between the two adjacent Y-shaped structures 8.
Optionally, each Y-shaped structure 8 of the first annular corrugated supporting rod 5, which is adjacent to the first main body part 2 in the middle part 14, is collinear with each Y-shaped structure 8 of the first annular corrugated supporting rod 5, which is adjacent to the second main body part 3 in the middle part 14, and an included angle between centers of circles of two adjacent Y-shaped structures 8 is 180 degrees.
Alternatively, as shown in fig. 4 and 5, the first annular corrugated supporting rod 5 of which the middle portion 14 adjoins the first body portion 2 and the first annular corrugated supporting rod 5 of which the middle portion 14 adjoins the second body portion 3 each include 4Y-shaped structures 8; each Y-shaped structure 8 of the first annular corrugated supporting rod 5 of the middle part 14 adjacent to the first main body part 2 is arranged in a collinear way with each Y-shaped structure 8 of the first annular corrugated supporting rod 5 of the middle part 14 adjacent to the second main body part 3, and the included angle between the circle centers of the two adjacent Y-shaped structures 8 is 90 degrees.
With this embodiment, it is advantageous that the development marks 9 clearly identify the open state of the middle of the stent after the stent is completely released, since there are enough development marks 9.
In one embodiment, the density in the circumferential direction of the zigzag waveform of the first annular waveform supporting rod 5 is smaller than the density in the circumferential direction of the zigzag waveform of the second annular waveform supporting rod 6; the circumferential width of each V-shaped structure 7 of the Z-shaped waveform of the first annular waveform support rod 5 is larger than the circumferential width of each V-shaped structure 7 of the Z-shaped waveform of the second annular waveform support rod 6.
Alternatively, the ratio of the density of the Z-shaped waveform of the first annular waveform support rod 5 in the circumferential direction to the density of the Z-shaped waveform of the second annular waveform support rod 6 in the circumferential direction is 2 to 3. The ratio of the circumferential width of each V-shaped structure 7 of the Z-shaped waveform of the first annular waveform support rod 5 to the circumferential width of each V-shaped structure 7 of the Z-shaped waveform of the second annular waveform support rod 6 is 3 to 2.
With this embodiment, the density of the Z-shaped waveform of the second annular waveform supporting rod 6 in the circumferential direction is small, which is advantageous for improving the expansion performance of the stent.
In one embodiment, as shown in fig. 1 to 5, connection points are formed between the first and second annular waveform support rods 5 and 6, the connection points being located where a valley of the Z-shaped waveform of the first annular waveform support rod 5 meets a peak of the Z-shaped waveform of the second annular waveform support rod 6 and where a peak of the Z-shaped waveform of the first annular waveform support rod 5 meets a valley of the Z-shaped waveform of the second annular waveform support rod 6.
Alternatively, the ratio of the wavelength of the first annular waveform support rod 5 to the wavelength of the second annular waveform support rod 6 is 3 to 2. Alternatively, the first annular wave shaped support rod 5 includes 8V-shaped structures 7, and the second annular wave shaped support rod 6 includes 12V-shaped structures 7.
Therefore, at the connection position of the first annular waveform support rod 5 and the second annular waveform support rod 6, the peaks or the troughs of the first annular waveform support rod 5 are distributed alternatively in a closed loop and an open loop, that is, an open loop peak or trough is arranged between the peaks or the troughs of the second annular waveform support rods 6 of two adjacent closed loops; two open-loop wave crests or wave troughs are arranged between the wave crests or the wave troughs of the second annular waveform supporting rods 6 of the two adjacent closed loops.
Optionally, the first annular waveform supporting rod 5 has 4 closed-loop wave crests, 4 open-loop wave crests, 4 closed-loop wave troughs and 4 open-loop wave troughs; the second annular waveform support rod 6 has 4 closed-loop peaks, 8 open-loop peaks, 4 closed-loop troughs and 8 open-loop troughs.
The wave crests or wave troughs of the closed-loop annular waveform supporting rods can provide larger supporting force, so that the support is ensured to have enough supporting force, and meanwhile, the supporting force of the support is not too large because the support has the wave crests or the wave troughs of the open loop; and because the wave crest or the wave trough of the open ring is not connected with other parts of the stent, the degree of freedom of bending is larger, and the flexibility of the stent is ensured.
Through this embodiment, the support both had sufficient holding power, and the holding power can not be too big, simultaneously, has guaranteed the compliance of support.
In one embodiment, as shown in fig. 4 and 5, the proximal portion 1 comprises two first annular wave-shaped support rods 5 axially juxtaposed; alternatively, as shown in fig. 1 and 2, the proximal portion 1 comprises two second annular wave-shaped support rods 6 axially arranged in parallel; and/or as shown in fig. 4 and 5, the distal end portion 4 comprises two first annular wave-shaped support rods 5 axially juxtaposed; alternatively, as shown in fig. 1 and 2, the distal end portion 4 includes two second annular wave-shaped support rods 6 axially juxtaposed.
By this embodiment, the proximal portion 1 and the distal portion 4, which are advantageous for forming a closed loop design, the free ends are effectively prevented from puncturing the vessel wall.
In one embodiment, the proximal portion 1 comprises two first annular wave-shaped support rods 5 axially juxtaposed, the first body portion 2 being connected to the proximal portion 1 by means of second annular wave-shaped support rods 6; the proximal part 1 comprises two second annular waveform supporting rods 6 which are axially distributed in parallel, and the first main body part 2 is connected with the proximal part 1 through a first annular waveform supporting rod 5; the distal end part 4 comprises two first annular corrugated supporting rods 5 which are axially distributed in parallel, and the second body part 3 is connected with the distal end part 4 through second annular corrugated supporting rods 6; the distal end portion 4 comprises two second annular wave-shaped support rods 6 which are axially arranged side by side, and the second body portion 3 is connected with the distal end portion 4 through the first annular wave-shaped support rods 5.
By this embodiment, the formation of a cone-shaped mouth is facilitated due to the fact that there are fewer attachment points of the proximal portion 1 to the first body portion 2 and fewer attachment points of the distal portion 4 to the second body portion 3.
In one embodiment, as shown in fig. 3, the junction of the proximal portion 1 and the first body portion 2 forms a tapered mouth 12 after stent deployment, the generatrix of the tapered mouth 12 being at an angle of 30 to 60 degrees to the axis; the junction of the distal portion 4 and the second body portion 3 forms a tapered mouth 12 after stent deployment, the generatrix of the mouth 12 being at an angle of 30 to 60 degrees to the axis.
Through this embodiment, set up flaring bell 12, can promote the radial holding power at support both ends, can effectively solve the displacement problem that produces in the support revascularis by blood flow impact.
In one embodiment, as shown in fig. 1 to 5, the first annular wave shaped support rod 5 or the second annular wave shaped support rod 6 distant from the proximal end portion 1 of the first body portion 2 or the distal end portion 4 of the second body portion 3 is provided with a fixing rod 11; at the distal end portion 4, the fixing rod 11 extends from the peak of the Z-shape waveform of the first annular waveform support rod 5 or the second annular waveform support rod 6; at the proximal end portion 1, the fixing rod 11 extends from the trough of the Z-shaped waveform of the first or second annular waveform supporting rod 5 or 6; the plurality of fixing rods 11 are uniformly distributed along the circumferential direction; the fixing lever 11 is provided with a developing mark 9.
With this embodiment, the distal end portion 4 and the proximal end portion 1 of the stent can be efficiently positioned by the development marker 9.
In one embodiment, as shown in fig. 1-5, either the proximal portion 1 or the distal portion 4 includes 4 fixation rods 11.
With this embodiment, it is advantageous for the development marks 9 to clearly identify the open state of the proximal and distal stent portions 1 and 4 after the stent has been completely released, since there are enough development marks 9.
In one embodiment, the visualization marker 9 is a radiopaque spring or a visualization metal ring, and the visualization marker 9 is fixed to the stent by laser welding or spot-bonding.
In one embodiment, the development marks 9 may also be disposed within the trough-like structure 13.
As shown in fig. 9, the fixing lever 11 is opened with a groove-like structure 13, and the developing mark 9 can be disposed in the groove-like structure 13.
The fixing portion 10 may also be provided with a groove-like structure 13, and the developing mark 9 may be disposed in the groove-like structure 13.
By this embodiment, the development marker 9 can be firmly fixed to the bracket, which is advantageous for improving the safety of the bracket.
In one embodiment, the stent is formed by laser cutting an alloy tube.
Under the condition that the cutting modes of the alloy pipe cut into the support are the same, the included angle between the adjacent rods is smaller, namely the vertex angle of the top end of the V-shaped structure 7 is smaller, the straight warp of the support is smaller, the included angle between the adjacent rods is larger, namely the vertex angle of the top end of the V-shaped structure 7 is larger, and the straight warp of the support is larger. The size of the included angle between the adjacent rods can be adjusted through expanding treatment, heat setting treatment and the like, wherein the heat setting treatment is carried out on the expanded stent and can be carried out for multiple times to adjust the diameter of the stent better.
By this embodiment, the manufacturing of the stent is facilitated.
Example one
As shown in fig. 1 to 5, the present embodiment provides a stent including a proximal end portion 1, a first body portion 2, an intermediate portion 14, a second body portion 3, and a distal end portion 4 connected in this order from the proximal end to the distal end; wherein the proximal portion 1, the first body portion 2, the intermediate portion 14, the second body portion 3 and the distal portion 4 are each formed of a looped corrugated strut rod; the first main body part 2 and the second main body part 3 are both composed of first annular waveform supporting rods 5 and second annular waveform supporting rods 6 which are alternately arranged, the first annular waveform supporting rods 5 and the second annular waveform supporting rods 6 are both Z-shaped waveforms, and each Z-shaped waveform comprises a plurality of V-shaped structures 7; the length of the Z-shaped waveform of the first annular waveform supporting rod 5 in the axial direction is greater than that of the Z-shaped waveform of the second annular waveform supporting rod 6 in the axial direction; the intermediate portion 14 is provided with the development mark 9.
The first and second annular waveform support rods 5 and 6 have substantially the same waveform, i.e., the ratio of the wavelength to the amplitude is constant, but the length of the Z-shaped waveform of the first annular waveform support rod 5 in the axial direction is greater than the length of the Z-shaped waveform of the second annular waveform support rod 6 in the axial direction, i.e., the first annular waveform support rod 5 has a larger amplitude relative to the second annular waveform support rod 6, and accordingly, the first annular waveform support rod 5 has a longer wavelength relative to the second annular waveform support rod 6.
Optionally, the ratio of the wavelength of the first annular waveform supporting rod 5 to the wavelength of the second annular waveform supporting rod 6 is 3 to 2, that is, the total wavelength of the two V-shaped structures 7 of the first annular waveform supporting rod 5 is equal to the total wavelength of the 3V-shaped structures 7 of the second annular waveform supporting rod 6. Optionally, the first annular waveform supporting rod 5 includes 8V-shaped structures 7, and the second annular waveform supporting rod 6 includes 12V-shaped structures 7, since the ratio of the wavelength of the first annular waveform supporting rod 5 to the wavelength of the second annular waveform supporting rod 6 is 3 to 2, so that the total length of the first annular waveform supporting rod 5 in the circumferential direction and the radial direction is equal to the total length of the second annular waveform supporting rod 6 in the circumferential direction and the radial direction, that is, the total wavelength of the first annular waveform supporting rod 5 is equal to the total wavelength of the second annular waveform supporting rod 6.
In the axial direction, the number of the annular waveform supporting rods forming the bracket is set according to actual needs, and the first main body part and the second main body part can comprise the same number of annular waveform supporting rods or different numbers of annular waveform supporting rods; alternatively, as shown in fig. 1, the first main body part 2 and the second main body part 3 of the stent may each include 6 annular waveform supporting rods, wherein there are 3 first annular waveform supporting rods 5 and 3 second annular waveform supporting rods 6 in the 6 annular waveform supporting rods.
Optionally, the cross-sectional dimension of the first annular corrugated strut bar 5 is larger than the cross-sectional dimension of the second annular corrugated strut bar 6, that is, the second annular corrugated strut bar 6 is thinner than the first annular corrugated strut bar 5.
The first main body part 2 and the second main body part 3 are respectively composed of a first annular waveform supporting rod 5 and a second annular waveform supporting rod 6 which are alternately arranged, and the first annular waveform supporting rod 5 and the second annular waveform supporting rod 6 are alternately arranged, so that the axial connection strength and the radial supporting force are ensured to be uniformly distributed along the axial direction, and the support is uniformly deformed when being stretched or bent; meanwhile, the length of the second annular waveform supporting rod 6 in the axial direction is smaller, so that the stent has more flexibility, expansion performance and bending performance compared with a stent which is completely composed of the first annular waveform supporting rods 5; moreover, the second annular waveform supporting rod 6 is thinner than the first annular waveform supporting rod 5, so that the stent is easier to stretch at the second annular waveform supporting rod 6, and compared with the stent which is completely composed of the first annular waveform supporting rod 5, the stent has better expansion performance; the sectional dimension of the first annular wavy support rod 5 is larger than that of the second annular wavy support rod 6, so that the stent has larger radial supporting force at the first annular wavy support rod 5, and compared with the stent which is entirely composed of the second annular wavy support rod 6, the overall radial supporting force of the stent is larger.
Meanwhile, the support is simple in structure and easy to implement.
The middle part 14 of the stent is provided with a development mark 9, thereby being beneficial to determining the specific position of the middle part 14 of the stent after the stent is completely released.
By utilizing the stent, the length of the Z-shaped waveform of the first annular waveform supporting rod 5 in the axial direction is greater than that of the Z-shaped waveform of the second annular waveform supporting rod 6 in the axial direction, so that the stent has higher radial supporting force, the flexibility and the expansion performance of the stent can be greatly enhanced, the overbending performance of the stent is improved, and the stent is simple in structure and easy to implement; the intermediate portion 14 is provided with a visualization marker to facilitate the determination of the specific location of the intermediate portion 14 of the stent after the stent has been fully released.
Example two
In one embodiment, the middle portion 14 comprises two first annular wave-shaped support rods 5 and part of the V-shaped structure 7 of the middle portion 14 is replaced by a Y-shaped structure 8, the Y-shaped structure 8 has a rod-shaped fixing portion 10 parallel to the axial direction of the stent, and the fixing portion 10 is provided with development marks 9. The rod-like fixing portion 10 of the Y-shaped structure 8 provides a fixing position for the development marks 9, facilitating the mounting and fixing of the development marks 9.
The point where the tip of the V-shaped structure 7 of the first annular corrugated support rod 5 of the middle portion 14 adjoining the first body portion 2 meets the tip of the V-shaped structure 7 of the first annular corrugated support rod 5 of the middle portion 14 adjoining the second body portion 3 forms a connection point of the middle portion 14.
The Y-shaped formations 8 are all of an open loop configuration, i.e. the rod-like fixed part 10 of the Y-shaped formation 8 of the first annular wave shaped support rod 5 with the intermediate part 14 adjacent the first body part 2 has a free end towards the second body part 3, and the rod-like fixed part 10 of the Y-shaped formation 8 of the first annular wave shaped support rod 5 with the intermediate part 14 adjacent the second body part 3 has a free end towards the first body part 2.
Part of the V-shaped structures 7 are open-loop structures, and the rest of the V-shaped structures 7 are closed-loop structures.
When the V-shaped structure 7 of the first annular corrugated supporting rod 5 of the middle part 14 adjacent to the first main body part 2 is arranged adjacent to the Y-shaped structure 8 of the first annular corrugated supporting rod 5 of the middle part 14 adjacent to the second main body part 3, the V-shaped structure 7 is an open-loop structure, i.e. the top end of the V-shaped structure 7 is not connected with other parts of the bracket; when the V-shaped structure 7 of the first annular wave shaped support rod 5 of the middle portion 14 adjoining the first body portion 2 is disposed adjacent to the V-shaped structure 7 of the first annular wave shaped support rod 5 of the middle portion 14 adjoining the second body portion 3, the V-shaped structure 7 is a closed loop structure, i.e. the top end of the V-shaped structure 7 is connected with other parts of the stent.
Similarly, when the V-shaped structure 7 of the first annular wave shaped support rod 5 of the middle portion 14 adjoining the second body portion 3 is disposed adjacent to the Y-shaped structure 8 of the first annular wave shaped support rod 5 of the middle portion 14 adjoining the first body portion 2, the V-shaped structure 7 is an open loop structure, i.e. the tip of the V-shaped structure 7 is not connected with other parts of the stent; when the V-shaped structure 7 of the first annular wave shaped support rod 5 of the middle portion 14 adjoining the second body portion 3 is disposed adjacent to the V-shaped structure 7 of the first annular wave shaped support rod 5 of the middle portion 14 adjoining the first body portion 2, the V-shaped structure 7 is a closed loop structure, i.e. the top end of the V-shaped structure 7 is connected with other parts of the stent.
The closed loop V-shaped configuration 7 of the intermediate portion 14 provides sufficient support for the stent; the V-shaped structure 7 and the Y-shaped structure 8 of the open ring can effectively avoid overlarge supporting force, and the flexibility of the support is ensured due to the fact that the bending freedom degree of the support is large.
As shown in fig. 1 to 5, the plurality of Y-shaped structures 8 of the first annular wave-shaped support rod 5 of the intermediate portion 14 adjacent to the first body portion 2 are uniformly distributed in the circumferential direction and the free ends of the fixing portions 10 of the Y-shaped structures 8 are directed to the second body portion 3, the plurality of Y-shaped structures 8 of the first annular wave-shaped support rod 5 of the intermediate portion 14 adjacent to the second body portion 3 are uniformly distributed in the circumferential direction and the free ends of the fixing portions 10 of the Y-shaped structures 8 are directed to the first body portion 2; the free end of the fixed portion 10 of the first annular wave shaped support rod 5 of the intermediate portion 14 adjoining the first body portion 2 is axially spaced from the free end of the fixed portion 10 of the first annular wave shaped support rod 5 of the intermediate portion 14 adjoining the second body portion 3.
The free end of the fixed portion 10 of the first annular wave support rod 5 of which the intermediate portion 14 abuts against the first body portion 2 is axially spaced from the free end of the fixed portion 10 of the first annular wave support rod 5 of which the intermediate portion 14 abuts against the second body portion 3, that is, the length of the Y-shaped structure 8 of the first annular wave support rod 5 in the axial direction is equal to or less than the length of the V-shaped structure 7 of the first annular wave support rod 5 in the axial direction so as to achieve the spaced free ends, and it is avoided that the fixed portion 10 of the first annular wave support rod 5 of which the intermediate portion 14 abuts against the first body portion 2 and the fixed portion 10 of the first annular wave support rod 5 of which the intermediate portion 14 abuts against the second body portion 3 are positionally overlapped in the axial direction, so that the development mark 9 of the first body portion 2 and the development mark 9 of the second body portion 3 are misaligned in the axial direction, so that, in a compressed state, the overall length of the intermediate portion is twice the length of the development mark 9. Twice the length, which is beneficial for the operator to observe better.
More importantly, the free end of the fixing part 10 of the first annular wave-shaped support rod 5 of the middle part 14 abutting the first main body part 2 is axially spaced from the free end of the fixing part 10 of the first annular wave-shaped support rod 5 of the middle part 14 abutting the second main body part 3, so that the development mark 9 of the first annular wave-shaped support rod 5 of the middle part 14 abutting the first main body part 2 is axially spaced from the development mark 9 of the first annular wave-shaped support rod 5 of the middle part 14 abutting the second main body part 3, and when the stent is in a compressed state, the volume of the stent in the radial direction can be reduced, and the pushing resistance can be reduced.
As shown in fig. 1 to 3, each Y-shaped structure 8 of the first annular corrugated support rod 5 of which the middle portion 14 is adjacent to the first body portion 2 is circumferentially staggered from each Y-shaped structure 8 of the first annular corrugated support rod 5 of which the middle portion 14 is adjacent to the second body portion 3; the included angle between the centers of circles corresponding to two adjacent Y-shaped structures 8 is a fixed value, wherein the two adjacent Y-shaped structures 8 respectively belong to two first annular waveform support rods 5 of the middle part 14.
The Y-shaped structures 8 arranged in a staggered mode can reduce pushing resistance. Meanwhile, in the compressed state, since the development marks 9 of the first annular wave-shaped support rod 5 of which the middle portion 14 abuts against the first body portion 2 and the development marks 9 of the first annular wave-shaped support rod 5 of which the middle portion 14 abuts against the second body portion 3 are not overlapped in the axial direction, the middle portion overall radiopaque length is twice as long as the development marks 9, and the length is twice, which is beneficial for the operator to observe better. The visualization marker 9 facilitates the operator to locate the position of the stand after it has been opened.
As shown in fig. 4 and 5, each of the Y-shaped structures 8 of the first annular wave-shaped support rod 5 of which the intermediate portion 14 adjoins the first body portion 2 is respectively disposed collinearly with each of the Y-shaped structures 8 of the first annular wave-shaped support rod 5 of which the intermediate portion 14 adjoins the second body portion 3.
In the compressed state, since the development marks 9 of the first annular wave-shaped support rod 5 of which the intermediate portion 14 abuts the first body portion 2 and the development marks 9 of the first annular wave-shaped support rod 5 of which the intermediate portion 14 abuts the second body portion 3 are not overlapped in the axial direction, the middle portion overall radiopaque length is twice as long as the development marks 9, and the length is twice as long, which is advantageous for the operator to view better. The co-linear arrangement of the Y-shaped structures 8 facilitates more convenient fixing of the development marks 9 and makes it easier to observe and position the development marks 9.
Alternatively, as shown in fig. 5, two development marks 9 arranged in line may be formed as a single body.
As shown in fig. 1 to 3, the first annular wave shaped support rod 5 of which the middle portion 14 adjoins the first body portion 2 and the first annular wave shaped support rod 5 of which the middle portion 14 adjoins the second body portion 3 each include two Y-shaped structures 8.
The middle portion 14 is disposed 180 degrees apart adjacent to the two Y-shaped structures 8 of the first annular wave shaped support rod 5 of the first body portion 2, and the middle portion 14 is disposed 180 degrees apart adjacent to the two Y-shaped structures 8 of the first annular wave shaped support rod 5 of the second body portion 2. The middle part 14 is provided with 3V-shaped structures 7 between two Y-shaped structures 8 of the first annular wavy support rod 5 adjacent to the first main body part 2; and the middle portion 14 has 3V-shaped structures 7 between the two Y-shaped structures 8 of the first annular wave shaped support rod 5 adjacent to the second body portion 3.
Optionally, each Y-shaped structure 8 of the first annular corrugated supporting rod 5, which is adjacent to the first main body part 2 through the middle part 14, is staggered with each Y-shaped structure 8 of the first annular corrugated supporting rod 5, which is adjacent to the second main body part 3 through the middle part 14, and the included angle between the centers of the two adjacent Y-shaped structures 8 is 90 degrees, wherein each two adjacent Y-shaped structures 8 includes one V-shaped structure 7, which is adjacent to the first annular corrugated supporting rod 5 of the first main body part 2 through the middle part 14, and one V-shaped structure 7, which is adjacent to the first annular corrugated supporting rod 5 of the second main body part 3 through the middle part 14, and one V-shaped structure 7, which is adjacent to the first annular corrugated supporting rod 5 of the first main body part 2 through the middle part 14, and one V-shaped structure 7, which is adjacent to the first annular corrugated supporting rod 5 of the second main body part 3 through the middle part 14, are disposed between the two adjacent Y-shaped structures 8.
Optionally, each Y-shaped structure 8 of the first annular corrugated supporting rod 5, which is adjacent to the first main body portion 2 at the middle portion 14, is collinear with each Y-shaped structure 8 of the first annular corrugated supporting rod 5, which is adjacent to the second main body portion 3 at the middle portion 14, and an included angle between centers of circles corresponding to two adjacent Y-shaped structures 8 is 180 degrees.
Alternatively, as shown in fig. 4 and 5, the first annular corrugated supporting rod 5 of which the middle portion 14 adjoins the first body portion 2 and the first annular corrugated supporting rod 5 of which the middle portion 14 adjoins the second body portion 3 each include 4Y-shaped structures 8; each Y-shaped structure 8 of the first annular corrugated supporting rod 5 of the middle portion 14 adjacent to the first main body portion 2 is arranged in a collinear way with each Y-shaped structure 8 of the first annular corrugated supporting rod 5 of the middle portion 14 adjacent to the second main body portion 3, and the included angle between the centers of the circles of the two adjacent Y-shaped structures 8 is 90 degrees. Due to the fact that enough developing marks 9 are arranged, after the support is completely released, the developing marks 9 can clearly identify the opening state of the middle of the support.
EXAMPLE III
The density of the Z-shaped waveform of the first annular waveform supporting rod 5 in the circumferential direction is less than that of the Z-shaped waveform of the second annular waveform supporting rod 6 in the circumferential direction; the circumferential width of each V-shaped structure 7 of the Z-shaped waveform of the first annular waveform support rod 5 is larger than the circumferential width of each V-shaped structure 7 of the Z-shaped waveform of the second annular waveform support rod 6.
Alternatively, the ratio of the density of the zigzag waveform of the first annular wavy support rod 5 in the circumferential direction to the density of the zigzag waveform of the second annular wavy support rod 6 in the circumferential direction is 2 to 3. The ratio of the circumferential width of each V-shaped structure 7 of the Z-shaped waveform of the first annular waveform support rod 5 to the circumferential width of each V-shaped structure 7 of the Z-shaped waveform of the second annular waveform support rod 6 is 3 to 2.
As shown in fig. 1 to 5, a connection point is formed between the first annular wave-shaped support rod 5 and the second annular wave-shaped support rod 6, and the connection point is located where the wave trough of the Z-shaped wave of the first annular wave-shaped support rod 5 meets the wave crest of the Z-shaped wave of the second annular wave-shaped support rod 6, and where the wave crest of the Z-shaped wave of the first annular wave-shaped support rod 5 meets the wave trough of the Z-shaped wave of the second annular wave-shaped support rod 6.
Alternatively, the ratio of the wavelength of the first annular waveform supporting rod 5 to the wavelength of the second annular waveform supporting rod 6 is 3 to 2. Alternatively, the first annular wave shaped support rod 5 includes 8V-shaped structures 7, and the second annular wave shaped support rod 6 includes 12V-shaped structures 7.
Therefore, at the connection position of the first annular waveform support rod 5 and the second annular waveform support rod 6, the peaks or the troughs of the first annular waveform support rod 5 are distributed alternatively in a closed loop and an open loop, that is, an open loop peak or trough is arranged between the peaks or the troughs of the second annular waveform support rods 6 of two adjacent closed loops; two open-loop wave crests or wave troughs are arranged between the wave crests or the wave troughs of the second annular waveform supporting rods 6 of the two adjacent closed loops.
Optionally, the first annular waveform supporting rod 5 has 4 closed-loop wave crests, 4 open-loop wave crests, 4 closed-loop wave troughs and 4 open-loop wave troughs; the second annular waveform support rod 6 has 4 closed-loop peaks, 8 open-loop peaks, 4 closed-loop troughs and 8 open-loop troughs.
The wave crests or wave troughs of the closed-loop annular waveform supporting rods can provide larger supporting force, so that the support is ensured to have enough supporting force, and meanwhile, the supporting force of the support is not too large because the support has the wave crests or the wave troughs of the open loop; and because the wave crest or the wave trough of the open ring is not connected with other parts of the stent, the degree of freedom of bending is larger, and the flexibility of the stent is ensured.
Example four
As shown in fig. 4 and 5, the proximal portion 1 includes two first annular wave-shaped support rods 5 axially juxtaposed; alternatively, as shown in fig. 1 and 2, the proximal portion 1 includes two second annular wave-shaped support rods 6 axially juxtaposed; and/or as shown in fig. 4 and 5, the distal end portion 4 comprises two first annular wave-shaped support rods 5 axially juxtaposed; alternatively, as shown in fig. 1 and 2, the distal end portion 4 includes two second annular wave-shaped support rods 6 axially juxtaposed; thereby being beneficial to form a closed loop design of the proximal part 1 and the distal part 4, and effectively avoiding the free end from puncturing the vessel wall.
The proximal part 1 comprises two first annular corrugated supporting rods 5 which are axially distributed in parallel, and the first main body part 2 is connected with the proximal part 1 through second annular corrugated supporting rods 6; the proximal part 1 comprises two second annular waveform supporting rods 6 which are axially distributed in parallel, and the first main body part 2 is connected with the proximal part 1 through a first annular waveform supporting rod 5; the distal end part 4 comprises two first annular corrugated supporting rods 5 which are axially distributed in parallel, and the second main body part 3 is connected with the distal end part 4 through second annular corrugated supporting rods 6; the distal end portion 4 comprises two second annular wave-shaped support rods 6 which are axially arranged side by side, and the second body portion 3 is connected with the distal end portion 4 through the first annular wave-shaped support rods 5. The formation of a tapered mouth is facilitated by the fact that there are fewer attachment points for the proximal section 1 to the first body section 2 and fewer attachment points for the distal section 4 to the second body section 3.
As shown in fig. 3, the junction of the proximal portion 1 and the first body portion 2 forms a tapered mouth 12 after the stent is unfolded, and the included angle between the generatrix of the tapered mouth 12 and the axis is 30 to 60 degrees; the junction of the distal portion 4 and the second body portion 3 forms a tapered mouth 12 after stent deployment, the generatrix of the tapered mouth 12 being at an angle of 30 to 60 degrees to the axis. The conical opening 12 which is expanded outwards is arranged, so that the radial supporting force at two ends of the support can be improved, and the problem of displacement caused by blood flow impact in the blood vessel of the support can be effectively solved.
As shown in fig. 1 to 5, the fixed rod 11 is arranged on the first annular wave-shaped support rod 5 or the second annular wave-shaped support rod 6 which is away from the proximal end portion 1 of the first body portion 2 or the distal end portion 4 of the second body portion 3; at the distal end portion 4, the fixing rod 11 extends from the peak of the Z-shaped waveform of the first annular waveform supporting rod 5 or the second annular waveform supporting rod 6; at the proximal end portion 1, the fixing rod 11 extends from the trough of the Z-shaped waveform of the first or second annular waveform supporting rod 5 or 6; the plurality of fixing rods 11 are uniformly distributed along the circumferential direction; the fixing rod 11 is provided with the development marker 9, so that the distal end portion 4 and the proximal end portion 1 of the stent can be effectively positioned by the development marker 9.
In one embodiment, as shown in fig. 1-5, either the proximal portion 1 or the distal portion 4 includes 4 fixation rods 11. With enough visualization marks 9, it is advantageous that the visualization marks 9 clearly identify the open state of the proximal portion 1 and the distal portion 4 of the stent after the stent is completely released.
DAS mode
As shown in FIG. 6, in DAS route mode, 4 developing marks 9 in the middle of the stent are positioned at the position of the tumor diameter opening, the relative position of the stent is kept unchanged, the stent is released in situ, and the operator can position the stent conveniently to a great extent. As shown in fig. 7, in the DAS imaging mode, after the stent is completely released, the central 4 visualization markers 9 clearly identify the open state of the stent. As shown in fig. 8, the stent is excellent in adherence performance at a bending radius of 4 mm.
The embodiments of the present invention are not limited to the above-described examples, and various changes and modifications in form and detail may be made by those skilled in the art without departing from the spirit and scope of the present invention, and these are considered to fall within the scope of the present invention.

Claims (16)

1. A stent comprising a proximal portion, a first body portion, an intermediate portion, a second body portion, and a distal portion connected in series from a proximal end to a distal end; wherein the proximal portion, the first body portion, the intermediate portion, the second body portion, and the distal portion are all comprised of looped, wave-shaped struts; the first main body part and the second main body part are both composed of first annular waveform supporting rods and second annular waveform supporting rods which are alternately arranged, the first annular waveform supporting rods and the second annular waveform supporting rods are both in a Z-shaped waveform, and the Z-shaped waveform comprises a plurality of V-shaped structures; the length of the Z-shaped waveform of the first annular waveform supporting rod in the axial direction is greater than that of the Z-shaped waveform of the second annular waveform supporting rod in the axial direction; the intermediate portion is provided with a development mark.
2. The stent of claim 1, wherein the middle portion comprises two first annular wave-shaped support rods and a portion of the V-shaped structure of the middle portion is replaced by a Y-shaped structure having a rod-shaped fixing portion parallel to an axial direction of the stent, the fixing portion having a development mark disposed thereon.
3. The stent of claim 1 or 2, wherein the junction where the apex of the V-shaped structure of the first looped corrugated strut of the middle portion adjoining the first body portion meets the apex of the V-shaped structure of the first looped corrugated strut of the middle portion adjoining the second body portion forms a connection point of the middle portion.
4. The stent of claim 3 wherein the plurality of Y-shaped structures of the intermediate portion adjoining the first annular wave shaped support rod of the first body portion are evenly distributed in the circumferential direction and the free ends of the fixed portions of the Y-shaped structures are directed toward the second body portion, the plurality of Y-shaped structures of the intermediate portion adjoining the first annular wave shaped support rod of the second body portion are evenly distributed in the circumferential direction and the free ends of the fixed portions of the Y-shaped structures are directed toward the first body portion;
the free end of the fixed portion of the first annular wave shaped support rod whose intermediate portion abuts the first body portion is axially spaced apart from the free end of the fixed portion of the first annular wave shaped support rod whose intermediate portion abuts the second body portion.
5. The stent of claim 4 wherein each of the Y-shaped structures of the first annular wave-shaped support rods having the intermediate portion adjoining the first body portion are circumferentially staggered from each of the Y-shaped structures of the first annular wave-shaped support rods having the intermediate portion adjoining the second body portion; the included angle of the circle centers corresponding to the two adjacent Y-shaped structures is a fixed value.
6. The stent of claim 4 wherein each of the Y-shaped structures of the first looped, undulating strut of the intermediate portion adjoining the first body portion are each disposed co-linearly with each of the Y-shaped structures of the first looped, undulating strut of the intermediate portion adjoining the second body portion.
7. A stent according to claim 5 or 6, wherein the first annular wave shaped strut of the intermediate portion adjoining the first body portion and the first annular wave shaped strut of the intermediate portion adjoining the second body portion each comprise two of the Y-shaped structures.
8. The stent of claim 1, wherein the density of the zigzag waveform of the first annular wave-shaped support rods in the circumferential direction is less than the density of the zigzag waveform of the second annular wave-shaped support rods in the circumferential direction.
9. The stent according to claim 1, wherein a connection point is formed between the first and second annular wave shaped support rods, the connection point being located where a trough of the Z-shaped wave of the first annular wave shaped support rod meets a peak of the Z-shaped wave of the second annular wave shaped support rod and where a peak of the Z-shaped wave of the first annular wave shaped support rod meets a trough of the Z-shaped wave of the second annular wave shaped support rod.
10. The stent according to claim 1, wherein the proximal end portion comprises two of the first annular wave shaped support rods axially juxtaposed or the proximal end portion comprises two of the second annular wave shaped support rods axially juxtaposed; and/or the distal end part comprises two first annular wave-shaped supporting rods which are axially distributed in parallel, or the distal end part comprises two second annular wave-shaped supporting rods which are axially distributed in parallel.
11. The stent of claim 10 wherein the proximal portion includes two of the first annular corrugated struts axially juxtaposed, the first body portion being connected to the proximal portion by second annular corrugated struts; the proximal part comprises two second annular waveform supporting rods which are axially distributed in parallel, and the first main body part is connected with the proximal part through the first annular waveform supporting rods; the distal end part comprises two first annular corrugated supporting rods which are axially distributed in parallel, and the second main body part is connected with the distal end part through second annular corrugated supporting rods; the distal end portion comprises two second annular waveform supporting rods which are axially distributed in parallel, and the second main body portion is connected with the distal end portion through the first annular waveform supporting rods.
12. The stent of claim 11, wherein the junction of the proximal portion and the first body portion forms a tapered opening after deployment of the stent, the tapered opening having a generatrix at an angle of 30 to 60 degrees from the axis;
the junction of the distal portion and the second body portion forms a tapered opening after the stent is deployed, and the included angle between the generatrix of the tapered opening and the axis is 30-60 degrees.
13. The stent of any one of claims 10 to 12, wherein a fixing rod is disposed on the first or second annular wave shaped support rods distal from the proximal end portion of the first body portion or distal end portion of the second body portion; at the distal end portion, the fixation rod extending from a peak of the Z-shaped waveform of the first or second looped waveform support rod; at the proximal end portion, the fixation rod extends from a trough of the Z-shaped waveform of the first or second annular waveform support rods; the fixing rods are uniformly distributed along the circumferential direction; the fixed rod is provided with a developing mark.
14. The stent of claim 13, wherein the proximal portion or the distal portion each comprise four of the fixation rods.
15. A stent according to claim 1, 2 or 13, wherein the visualization marker is a radiopaque spring or a visualization metal ring, the visualization marker being fixed to the stent by laser welding or spot gluing.
16. The stent of claim 1 wherein the stent is formed by laser cutting an alloy tube.
CN202210485907.6A 2022-05-06 2022-05-06 Support frame Pending CN115363667A (en)

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US8366763B2 (en) * 2009-07-02 2013-02-05 Tryton Medical, Inc. Ostium support for treating vascular bifurcations
CN102813566A (en) * 2012-04-24 2012-12-12 冯海全 Coronary stent
CN204106265U (en) * 2014-08-12 2015-01-21 孙燕 A kind of semi open model intravascular stent
US10238513B2 (en) * 2017-07-19 2019-03-26 Abbott Cardiovascular Systems Inc. Intravascular stent
US11406517B2 (en) * 2017-11-17 2022-08-09 Hangzhou Endonom Medtech Co. Ltd. Vascular stent
CN110721012A (en) * 2018-07-16 2020-01-24 杭州唯强医疗科技有限公司 Marking support for subsection
CN110269730B (en) * 2019-07-22 2024-02-27 珠海通桥医疗科技有限公司 Vascular stent
CN112353535B (en) * 2020-11-09 2024-07-19 首都医科大学附属北京天坛医院 Self-expanding stent applicable to intracranial venous sinus and conveying system thereof

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