CN110786911A - Reamer for medullary cavity - Google Patents
Reamer for medullary cavity Download PDFInfo
- Publication number
- CN110786911A CN110786911A CN201911024887.7A CN201911024887A CN110786911A CN 110786911 A CN110786911 A CN 110786911A CN 201911024887 A CN201911024887 A CN 201911024887A CN 110786911 A CN110786911 A CN 110786911A
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- CN
- China
- Prior art keywords
- reamer
- head
- intramedullary
- anchoring
- outer diameter
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000004873 anchoring Methods 0.000 claims abstract description 43
- 230000007423 decrease Effects 0.000 claims description 3
- 238000002513 implantation Methods 0.000 abstract description 3
- 210000000988 bone and bone Anatomy 0.000 description 12
- 238000001356 surgical procedure Methods 0.000 description 5
- 210000000689 upper leg Anatomy 0.000 description 5
- 230000001054 cortical effect Effects 0.000 description 4
- 210000001624 hip Anatomy 0.000 description 3
- 241001391944 Commicarpus scandens Species 0.000 description 2
- 229910001069 Ti alloy Inorganic materials 0.000 description 2
- 239000002639 bone cement Substances 0.000 description 2
- 210000004394 hip joint Anatomy 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000003044 adaptive effect Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011540 hip replacement Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000009418 renovation Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 239000010937 tungsten Substances 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
Images
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/16—Bone cutting, breaking or removal means other than saws, e.g. Osteoclasts; Drills or chisels for bones; Trepans
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/16—Bone cutting, breaking or removal means other than saws, e.g. Osteoclasts; Drills or chisels for bones; Trepans
- A61B17/164—Bone cutting, breaking or removal means other than saws, e.g. Osteoclasts; Drills or chisels for bones; Trepans intramedullary
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/16—Bone cutting, breaking or removal means other than saws, e.g. Osteoclasts; Drills or chisels for bones; Trepans
- A61B17/1659—Surgical rasps, files, planes, or scrapers
Landscapes
- Health & Medical Sciences (AREA)
- Surgery (AREA)
- Life Sciences & Earth Sciences (AREA)
- Biomedical Technology (AREA)
- Medical Informatics (AREA)
- Orthopedic Medicine & Surgery (AREA)
- Oral & Maxillofacial Surgery (AREA)
- Engineering & Computer Science (AREA)
- Dentistry (AREA)
- Heart & Thoracic Surgery (AREA)
- Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
- Molecular Biology (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Prostheses (AREA)
Abstract
The invention belongs to the field of medical instruments and discloses a reamer for a medullary cavity. The intramedullary cavity reamer comprises an operating rod, an anchoring ball head and a reamer head which are coaxially connected in sequence, wherein the ratio of the outer diameter size of the anchoring ball head to the length of the reamer head is more than 1 and less than 2. The medullary cavity reamer can realize the effective medullary expansion with adaptability along with the shape of the medullary cavity, thereby ensuring the good implantation position of the subsequently implanted prosthesis in the medullary cavity.
Description
Technical Field
The invention belongs to the field of medical instruments, and particularly relates to a reamer for a medullary cavity.
Background
The medullary cavity reamer is an important surgical tool for reaming and reaming the medullary cavity of the femur in the hip joint replacement operation. The reaming mode of the medullary cavity reamer is similar to that of a reamer machined by common machinery, and the main cutting object is cancellous bone.
The existing intramedullary cavity reamer technology is mature at present, and can meet the needs of most conventional hip joint operations. However, as the demand for hip replacement is increasing, so too is the need for revision hip surgery. In hip revision surgery, an elongated femoral stem is often required to be implanted, and the elongated femoral stem must be matched with the femoral stem due to the existence of the femoral anterior arch, so that certain requirements are provided for marrow enlargement of a medullary cavity. The soft medullary cavity reamer is usually used for reaming the medullary cavity in the prior art, and although the soft medullary cavity reamer can complete reaming to a certain degree and simultaneously avoid the problem that the reamer itself breaks through cortical bone, effective reaming in the deeper medullary cavity at the tail end of the front femoral arch can not be completely realized, which easily causes the position of the implanted femoral stem prosthesis to be poor, thereby causing the problem that the femur is easy to fracture. In addition, the existing soft reamer for medullary cavity has no way to block the medullary cavity in the renovation operation and to fill and harden the bone cement.
In response to the deficiencies of the prior art, it would be desirable to have an intramedullary canal reamer capable of achieving effective reaming that is adaptive to the shape of the intramedullary canal to ensure a good implantation position of a subsequently implanted prosthesis within the intramedullary canal.
Disclosure of Invention
In order to solve all or part of the above problems, the present invention aims to provide an intramedullary canal reamer which can effectively ream the medullary canal in accordance with the shape of the medullary canal, so as to ensure a good implantation position of a subsequently implanted prosthesis in the medullary canal.
The intramedullary cavity reamer comprises an operating rod, an anchoring ball head and a reamer head which are coaxially connected in sequence, wherein the ratio of the outer diameter size of the anchoring ball head to the length of the reamer head is more than 1 and less than 2.
Furthermore, at least one cutting channel extending from the tail end of the reamer head to the anchoring ball head is formed on the reamer head, and a through hole communicated with the cutting channel is formed on the anchoring ball head.
Furthermore, a plurality of cutting channels extending from the tail end of the reamer head to the anchoring ball head are formed on the reamer head, a plurality of through holes communicated with the corresponding cutting channels are formed on the anchoring ball head, and the through holes are communicated with each other.
Further, the cutting channel has a tapering width in a direction towards the through hole.
Further, the reamer head includes a plurality of coaxially connected cutting posts, each cutting post having an outer diameter dimension that decreases in a direction from the anchoring bulb toward the reamer head.
Further, the end of the reamer head distal to the cutting post of the anchoring bulb is configured as a tip.
Further, the outer diameter dimension of the anchoring bulb is less than the inner diameter dimension of the human medullary cavity and greater than 4/5 of the inner diameter dimension of the human medullary cavity.
Further, the ratio of the outer diameter dimension of the operating rod to the outer diameter dimension of the anchoring ball head is greater than 1: 5.
Further, the outer diameter dimension of the operating rod is smaller than the outer diameter dimension of the cutting post of the reamer head near the anchoring bulb.
Further, the operating rod, the anchoring ball head and the reamer head are integrally formed.
The solid medullary cavity reamer of the invention solves the problems that the medullary cavity reamer is easy to break through cortical bone and can not effectively ream along with the shape of medullary cavity in the medullary cavity of human body in reaming, especially in joint revision operation, with simple and exquisite design. The medullary cavity reamer can be effectively anchored at a medullary opening point, realizes medullary opening and can immediately expand the medullary, has easy direction control and strong trafficability, saves labor, effectively reduces the number of times of perspective and has extremely high clinical use value.
Drawings
FIG. 1 is a schematic structural view of an intramedullary canal reamer according to an embodiment of the present invention;
FIG. 2 is a cross-sectional view of the intramedullary canal reamer of FIG. 1;
fig. 3 is a schematic representation of the operation of an intramedullary canal reamer according to an embodiment of the present invention.
Detailed Description
For a better understanding of the objects, structure and function of the invention, reference should be made to the following detailed description taken in conjunction with the accompanying drawings.
Fig. 1 and 2 illustrate the structure of an intramedullary canal reamer 100 according to an embodiment of the present invention. Referring to fig. 1 and 2, the intramedullary reamer 100 includes a shaft 1, an anchoring ball 2, and a reamer head 3, which are coaxially connected in sequence. Wherein the ratio of the outer diameter dimension of the anchoring bulb 2 to the length of the reamer head 3 is greater than 1 and less than 2.
Fig. 3 shows a schematic view of an intramedullary canal reamer 100 of an embodiment of the present invention inserted into the intramedullary canal 200 of a human femur for reaming during a hip revision surgery. In use of the intramedullary canal reamer 100 of embodiments of the present invention, the intramedullary canal reamer 100 may be advanced into the intramedullary canal 200 of a femur to remove cancellous bone 201. Through the design of the anchoring ball head 2 and the reamer head 3, the intramedullary canal reamer 100 can be ensured to be always positioned in the center of the medullary canal of a patient, and for the femoral anterior arch of the medullary canal (namely the bending part of the medullary canal 200 shown in fig. 3) and the reaming in the medullary canal 200 with the deeper end of the femoral anterior arch, the design can provide more effective anchoring and reaming points for an operator, reduce the number of times of perspective and greatly simplify the operation process. Meanwhile, due to the design of the proportion of the outer diameter size of the anchor ball head 2 to the length size of the reamer head 3 of the intramedullary cavity reamer 100 of the embodiment of the invention, the problem that the reamer head 3 breaks through the cortical bone 202 can be effectively avoided. In addition, the operating rod 1 of the intramedullary canal reamer 100 according to the embodiment of the present invention may be a hard rod, which provides direct force transmission to the anchor ball 2 and the reamer head 3, which is superior to several component forces provided by the existing soft intramedullary canal reamer, and which can reduce the force of a doctor and increase the controllability of the direction of the intramedullary canal reamer 100 while effectively removing the hardened material and the filled bone cement in the intramedullary canal during the revision surgery.
The intramedullary canal reamer 100 of the embodiment of the present invention solves the problems that the intramedullary canal reamer 100 is easy to break through cortical bone and cannot perform effective reaming according to the shape of the intramedullary canal in the human body intramedullary canal in reaming, especially in joint revision surgery, with a simple and exquisite design, and has a very high clinical use value.
In the embodiment shown in fig. 1 and 2, the reamer head 3 may be formed with at least one cutting channel 31 extending from the end of the reamer head 3 towards the anchoring bulb 2, the anchoring bulb 2 being formed with a through hole 21 communicating with the cutting channel 31. The cutting channel 31 is used to cut cancellous bone within the medullary cavity 200 and provide a transport channel for the underreamed cancellous bone to facilitate expulsion through the through-hole 21.
Preferably, the reamer head 3 may be formed with a plurality of cutting passages 31 extending from the distal end of the reamer head 3 toward the anchor ball 2, and the anchor ball 2 may be formed with a plurality of through-holes 21 respectively communicating with the respective cutting passages 31, the through-holes 21 communicating with each other. Many cutting channels 31 can improve the cutting efficiency of reamer head 3, and the through-hole 21 of intercommunication each other can make cancellous bone can be discharged fast, also can effectively avoid the cancellous bone under the hinge to take place the phenomenon of jam in arbitrary through-hole 21 simultaneously.
Further preferably, in order to further improve the efficiency of the discharge of the reamed cancellous bone through the through-hole 21, the cutting channel 31 may be made to have a tapered width in a direction toward the through-hole 21.
In the embodiment shown in fig. 1, the reamer head 3 may comprise a plurality of coaxially connected cutting studs 32, each cutting stud 32 having an outer diameter dimension which decreases in a direction from the anchoring bulb 2 towards the reamer head 3. Such a design contributes to an improved cutting performance of the reamer head 3 and thus to an improved reaming efficiency of the reamer head 3.
Preferably, the end of the reamer head 3 remote from the cutting post 32 of the anchoring bulb 2 is configured as a tip, so that the reamer head 3 is easy to insert into the cancellous bone or hardened cement in the medullary cavity or the like.
According to the intramedullary canal reamer 100 of the present embodiment, the anchoring ball 2 may be spherical or oblate spherical. When the anchoring ball 2 is spherical, the outer diameter of the anchoring ball 2 mentioned below is understood to be the diameter of the anchoring ball 2; when the anchoring bulb 2 is oblate, the outer diameter dimension of the anchoring bulb 2 mentioned below is to be understood as the largest outer diameter dimension in the width direction of the anchoring bulb 2 (up-down direction as shown in fig. 1).
In a preferred embodiment, the anchoring bulb 2 may have an outer diameter dimension 4/5 that is less than the inner diameter dimension of the human intramedullary canal 200 and greater than the inner diameter dimension of the human intramedullary canal 200. The arrangement enables the intramedullary canal reamer 100 to have enough redundant space in the intramedullary canal, and the operating rod 1 can drive the anchoring ball head 2 to swing in a certain angle in the intramedullary canal, so that the intramedullary canal reamer 100 can expand or advance angularly, and the intramedullary canal reamer 100 can expand the marrow in response to the change of the shape of the intramedullary canal, for example, the anterior arch of the femur.
Further, the ratio of the outer diameter dimension of the operating rod 1 to the outer diameter dimension of the anchoring bulb 2 may be greater than 1: 5. This arrangement allows the shaft 1 to be of a smaller diameter, which helps to increase the space available for redundancy in the intramedullary canal 200 for the intramedullary canal reamer 100 to be reamed or advanced more angularly, so that the intramedullary canal reamer 100 can ream to accommodate changes in the shape of the intramedullary canal 200. Furthermore, the design of the longer lever 1 enables itself to be slightly bent to facilitate reaming or advancement of the reamer head 3 without affecting the stiffness required for reaming the lever 1.
Further, the outer diameter dimension of the operating rod 1 may be smaller than the outer diameter dimension of the cutting post 32 of the reamer head 3 near the anchoring bulb 2. This arrangement, which allows the outer diameter of the operating rod 1 to be smaller relative to the maximum outer diameter of the cutting post 32, not only allows the operating rod 1 to be slightly bent (without affecting the hardness required for reaming the operating rod 1) when it is longer, thereby facilitating reaming or advancement of the reamer head, but also ensures the structural strength of the reamer head 3 as a whole to ensure reaming of the reamer head 3.
According to the intramedullary canal reamer 100 of the embodiment of the present invention, the operating rod 1, the anchoring ball 2 and the reamer head 3 may be integrally formed, which contributes to the overall structural strength of the intramedullary canal reamer 100. Preferably, the intramedullary canal reamer 100 may be made of stainless steel, titanium alloy, tungsten steel, or ceramic, among other materials. Further preferably made of a titanium alloy.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention, and they should be construed as being included in the following claims and description. In particular, the technical features mentioned in the embodiments can be combined in any way as long as there is no structural conflict. It is intended that the invention not be limited to the particular embodiments disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.
Claims (10)
1. The intramedullary cavity reamer is characterized by comprising an operating rod, an anchoring ball head and a reamer head which are coaxially connected in sequence, wherein the ratio of the outer diameter size of the anchoring ball head to the length of the reamer head is more than 1 and less than 2.
2. The intramedullary reamer of claim 1 wherein the reamer head has at least one cutting channel formed therein extending from the end of the reamer head toward the anchoring bulb, the anchoring bulb having a through bore formed therein in communication with the cutting channel.
3. The intramedullary reamer of claim 2 wherein the reamer head defines a plurality of cutting channels extending from the end of the reamer head toward the anchoring bulb, the anchoring bulb defining a plurality of through-holes respectively communicating with the respective cutting channels, the through-holes communicating with one another.
4. The intramedullary reamer of claim 3 wherein the cutting channel has a tapered width in a direction toward the through bore.
5. The intramedullary reamer of any one of claims 1 to 4 wherein the reamer head includes a plurality of coaxially connected cutting posts, each of the cutting posts having an outer diameter dimension that decreases in a direction from the anchor ball head toward the reamer head.
6. The intramedullary reamer of claim 5 wherein the end of the reamer head distal to the cutting post of the anchor ball is configured as a tip.
7. The intramedullary reamer of claim 5 wherein the anchoring ball has an outer diameter dimension less than 4/5 the inner diameter dimension of the human intramedullary canal and greater than the inner diameter dimension of the human intramedullary canal.
8. The intramedullary reamer of claim 7 wherein the ratio of the outer diameter dimension of the shaft to the outer diameter dimension of the anchoring ball is greater than 1: 5.
9. The intramedullary reamer of claim 8 wherein the operative stem has an outer diameter dimension less than an outer diameter dimension of the reamer head's cutting post proximate the anchoring bulb.
10. The intramedullary reamer of any one of claims 1 to 4 wherein the lever, the anchor ball and the reamer head are integrally formed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911024887.7A CN110786911A (en) | 2019-10-25 | 2019-10-25 | Reamer for medullary cavity |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911024887.7A CN110786911A (en) | 2019-10-25 | 2019-10-25 | Reamer for medullary cavity |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110786911A true CN110786911A (en) | 2020-02-14 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911024887.7A Pending CN110786911A (en) | 2019-10-25 | 2019-10-25 | Reamer for medullary cavity |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110786911A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111407359A (en) * | 2020-04-09 | 2020-07-14 | 北京市春立正达医疗器械股份有限公司 | Upper arm bone lower extreme molding apparatus |
| CN112603391A (en) * | 2020-12-25 | 2021-04-06 | 北京市春立正达医疗器械股份有限公司 | Hip joint molding and medullary cavity path exploring device |
| CN116211393A (en) * | 2023-03-14 | 2023-06-06 | 北京市春立正达医疗器械股份有限公司 | Shoulder joint humerus marrow cavity distal end reaming instrument |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6332886B1 (en) * | 1999-02-03 | 2001-12-25 | Synthes (Usa) | Surgical reamer and method of using same |
| WO2014075990A1 (en) * | 2012-11-13 | 2014-05-22 | Trokamed Gmbh | Medullary cavity drill |
| CN204033419U (en) * | 2014-07-30 | 2014-12-24 | 常州健力邦德医疗器械有限公司 | Medical expansion marrow bores |
| US20180042618A1 (en) * | 2016-08-14 | 2018-02-15 | Greatbatch Ltd. | Cutting head for an intramedullary reamer |
| CN209203418U (en) * | 2018-08-01 | 2019-08-06 | 北京市春立正达医疗器械股份有限公司 | Myelocavity file |
| CN211325357U (en) * | 2019-10-25 | 2020-08-25 | 北京市春立正达医疗器械股份有限公司 | Reamer for medullary cavity |
-
2019
- 2019-10-25 CN CN201911024887.7A patent/CN110786911A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6332886B1 (en) * | 1999-02-03 | 2001-12-25 | Synthes (Usa) | Surgical reamer and method of using same |
| WO2014075990A1 (en) * | 2012-11-13 | 2014-05-22 | Trokamed Gmbh | Medullary cavity drill |
| CN204033419U (en) * | 2014-07-30 | 2014-12-24 | 常州健力邦德医疗器械有限公司 | Medical expansion marrow bores |
| US20180042618A1 (en) * | 2016-08-14 | 2018-02-15 | Greatbatch Ltd. | Cutting head for an intramedullary reamer |
| CN209203418U (en) * | 2018-08-01 | 2019-08-06 | 北京市春立正达医疗器械股份有限公司 | Myelocavity file |
| CN211325357U (en) * | 2019-10-25 | 2020-08-25 | 北京市春立正达医疗器械股份有限公司 | Reamer for medullary cavity |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111407359A (en) * | 2020-04-09 | 2020-07-14 | 北京市春立正达医疗器械股份有限公司 | Upper arm bone lower extreme molding apparatus |
| CN112603391A (en) * | 2020-12-25 | 2021-04-06 | 北京市春立正达医疗器械股份有限公司 | Hip joint molding and medullary cavity path exploring device |
| CN116211393A (en) * | 2023-03-14 | 2023-06-06 | 北京市春立正达医疗器械股份有限公司 | Shoulder joint humerus marrow cavity distal end reaming instrument |
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