CN221512117U - Lumbar vertebra isthmus crack pressurization fixing device - Google Patents

Abstract

The utility model discloses a lumbar isthmus fracture pressurizing and fixing device, which comprises a transverse connection body, a pedicle screw and a pressurizing body; the two pedicle screws comprise U-shaped universal screw tails and screws connected to one ends of the U-shaped universal screw tails, and U-shaped grooves are formed in the other ends of the U-shaped universal screw tails; two ends of the transverse connection body are detachably connected with the U-shaped grooves of the two U-shaped universal nail tails respectively and can rotate along a corresponding U-shaped groove; the middle part of the pressurizing body is provided with a V-shaped structure, and two ends of the pressurizing body are respectively provided with at least one pressurizing hole; at least two threaded holes are arranged at intervals in the middle of the transverse connection body, and one pressurizing hole is detachably connected with the corresponding threaded hole through a pressurizing screw. The utility model connects pedicle screws on two sides through the transverse connection, and the whole structure is firm; the middle part of the V-shaped pressurizing body is clamped at the root of the spinous process, and the pressurizing force conforming to the anatomical directions of isthmus and vertebral lamina is obtained through the rotation adjustment of the V-shaped pressurizing hole and the transverse connection body, so that the fracture bone grafting fusion is facilitated.

Description

Lumbar vertebra isthmus crack pressurization fixing device

Technical Field

The utility model relates to the technical field of medical equipment, in particular to a lumbar isthmus fracture pressurizing and fixing device.

Background

The lumbar vertebral arch isthmus fracture refers to isthmus bone defect or discontinuity between upper and lower articular processes of vertebral arch on one side or two sides, and clinical statistics data show that among patients with lower lumbago, most of patients with lumbar vertebral arch isthmus fracture are teenagers, and part of patients can be cured by conservative treatment methods such as medicines, physiotherapy and the like. For those with persistent lumbago or nerve damage, the short-term (3-6 months) internal vertebral body slipping and intervertebral disc degeneration are obvious, and surgical treatment can be considered. There are two types of surgical approaches currently employed: firstly, isthmus bone grafting operation and secondly, fusion internal fixation operation, wherein the former operation is poor in postoperative stability due to simple bone grafting, and is easy to cause unhealed, recrudescence and bedridden complications because of being braked for 2 to 3 months by a bed rest or a plaster support; the latter type of surgical type is most commonly used as intervertebral fusion segment pedicle screw fixation, because of fixation and fusion of the segments, although stability is good, the motion between the segments is sacrificed, teenagers with no obvious degeneration on the intervertebral disc are easy to cause the restriction of the lumbar motion after the operation, and the degeneration of the adjacent segments is accelerated.

In recent years, the defects of the two operation modes can be avoided by adopting an intra-segment repair internal fixation operation, the cure rate is higher, the later lumbar activity is recovered well, and the early activity can be realized. There are also some documents at present which disclose a hook screw internal fixing device for lumbar isthmus fracture for surgical treatment, such as chinese patent application No. 201810097787.6 and publication No. CN108125711B, which discloses a lumbar isthmus fracture internal fixing device, wherein the length of a 7-shaped fixing piece is utilized to conform to the vertebral plate hook and the longitudinal rod to obtain the optimal fixing direction, thereby effectively realizing isthmus fracture pressurization, and the connection of the two side internal fixing devices is realized through a triangle-shaped connector, so as to construct a stable integral structure, and the device is a surgical instrument for single vertebral body fixation. While some of the problems of lumbar isthmus cleft are addressed in publications like these, the use of pedicle screw hook systems for fixation is often difficult to adapt to the lamina, difficult to adjust intraoperatively, and not capable of rapid positioning and continuous compression; which is not very convenient to handle. For example, chinese patent application No. 201821518199.7 and publication No. CN 209332232U disclose a lumbar isthmus fracture repair fixing device, which is supported by a U-shaped rod and connected to the tail connecting seats of pedicle screws on both sides at the root of the spinous process, and provides supporting force to the spinous process to reduce isthmus fracture to a certain extent. The device in the similar publication adopts pedicle screws and a mould rod supported at the root of the spinous process, and can solve some problems of lumbar isthmus fracture, but in order to pressurize the isthmus, the connecting piece is driven to rotate by rotating the rotating sleeve in operation so as to adjust the supporting force to the spinous process, but the pressurizing force direction obtained by the mode is not perpendicular to the optimal direction of the fracture, in practice, lumbar vertebra movement is continuously dynamic, when the lumbar vertebra leans back, a micro-gap can appear between the mould rod and the root of the spinous process, and the isthmus is not pressurized enough, internal fixation is loose, and the like. Accordingly, the present application provides a lumbar isthmus compression fixation device.

Disclosure of utility model

The utility model provides a lumbar isthmus fracture pressurizing and fixing device, which is characterized in that pedicle screws on two sides are connected through a transverse connection body, so that the whole structure is firm; the middle part of the V-shaped pressurizing body is clamped at the root of the spinous process, and the pressurizing force conforming to the anatomical directions of isthmus and vertebral lamina is obtained through the rotation adjustment of the V-shaped pressurizing hole and the transverse connection body, so that the fracture bone grafting fusion is facilitated; the device is fixed by a single vertebral body, has firm structure, is easy to install and is minimally invasive in operation.

In order to achieve the above purpose, the technical scheme adopted by the utility model is as follows:

The lumbar isthmus fracture pressurizing and fixing device comprises a transverse connection body, pedicle screws and a pressurizing body; the pedicle screws comprise two U-shaped universal screw tails and screws connected to one ends of the U-shaped universal screw tails, and the other ends of the U-shaped universal screw tails are provided with U-shaped grooves; the two ends of the transverse connection body are detachably connected with the U-shaped grooves of the two U-shaped universal nails respectively and can rotate along the corresponding U-shaped groove; the middle part of the pressurizing body is provided with a V-shaped structure, and two ends of the pressurizing body are respectively provided with at least one pressurizing hole; at least two threaded holes are formed in the middle of the transverse connection body at intervals, and one pressurizing hole is detachably connected with the corresponding threaded hole through a pressurizing screw.

Further, the end part of the transverse connection body is of a cylindrical structure, and the end part of the transverse connection body is embedded from the side of a U-shaped groove corresponding to the U-shaped universal nail tail; the top of U-shaped universal nail tail is equipped with threaded connection's lock bolt, every lock bolt's one end butt compresses tightly the corresponding tip of cross body.

Further, the outer peripheral side of the end part of the transverse connection body is provided with anti-skid lines.

Further, the inner side of the bottom of the U-shaped universal nail tail is provided with anti-skid lines.

Further, the middle part of the horizontal conjoined is upwards bent and raised to form a raised part of an isosceles trapezoid structure, the threaded holes are distributed on two sides of the raised part, and each side is provided with two threaded holes.

Further, two sides of the protruding portion of the transverse connection body are respectively provided with two threaded holes which are arranged at intervals.

Further, each V-shaped end part of the pressurizing body is provided with at least two pressurizing holes, and a pressurizing inclined surface in each pressurizing hole faces to one side close to the transverse connection body.

The beneficial effects of the utility model are as follows:

1) According to the utility model, the pedicle screws at two sides are connected with the transverse connection body, and in the operation process, the V-shaped middle part of the pressurizing body is only clamped at the root part of the spinous process of the responsible vertebral body, so that the pressurizing body and the transverse connection body can be installed, the whole connection body is formed into a triangle, the structure is stable, and the installation is convenient; in the fixing process, the pressurizing body can simultaneously pressurize the root of the spinous process in the forward direction and the upward direction through the rotation adjustment of the pressurizing hole and the transverse connection body, so that the force application direction accords with the isthmus and the vertebral lamina dissection direction, the isthmus fissure obtains continuous dynamic and balanced pressurizing force perpendicular to the fissure, and the fracture bone grafting fusion is facilitated; the utility model is fixed by a single vertebral body, has firm structure, easy installation and minimally invasive operation. The surgical position is carried out under the condition of the natural position of the responsible vertebral body or the backward position of the adjusting operation bed, so that the problem that the V-shaped body and the root of the spinous process are loosened due to the micro-gap when the postoperative lumbar vertebra is backward in the above-mentioned publication is avoided, the isthmus pressurizing force is larger when the lumbar vertebra is forward bent, and the continuous dynamic pressurizing of the isthmus and the internal fixation loosening are maximally realized.

2) According to the utility model, the pressurizing body has a first pressurizing effect through the pressurizing hole, and when the pressurizing screw is screwed down, the flange surface of the pressurizing screw gradually presses the pressurizing inclined surface of the pressurizing hole in the downward moving process, so that the pressurizing body has a pressurizing force tending to the transverse connection body, and further the lumbar spinous process is pressurized.

3) According to the utility model, through the rotation adjustment of the transverse connection body to the human body head side direction, the secondary fine adjustment can be performed after the pressing body is fixed, so that the pressing body can provide supporting force with upward and forward trend to the spinous process, the pressing force conforming to the anatomical directions of the isthmus and the vertebral lamina is realized, the isthmus crack is reduced, and the fusion of the bone grafting block arranged in the isthmus crack and the isthmus is promoted.

4) The outer peripheral side of the end part of the transverse conjoined body is provided with anti-slip lines which are meshed with the anti-slip lines at the root of the U-shaped nail tail, so that the fixing effect can be enhanced, slipping and internal fixation looseness in a long term after operation are avoided, and the meshing is more compact and firm in lumbar vertebra dynamic movement.

Drawings

The utility model is described in further detail below with reference to the attached drawing figures, wherein:

FIG. 1 is a perspective view of the present utility model;

FIG. 2 is a perspective view of a conjoined cross in accordance with the present utility model;

FIG. 3 is a perspective view of a pressure body according to the present utility model;

FIG. 4 is a schematic partial cross-sectional view of a pressure body according to the present utility model;

The attached drawings are identified:

The device comprises a transverse connecting body 1, a pedicle screw 2, a pressurizing body 3, a protruding part 11, a non-slip line 12, a threaded hole 13, a screw 21, a universal screw tail 22, a locking bolt 23, a pressurizing hole 31 and a pressurizing screw 32.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

It will be understood that when an element is referred to as being "fixed to" another element, it can be directly on the other element or intervening elements may also be present. When a component is considered to be "connected" to another component, it can be directly connected to the other component or intervening components may also be present. When an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present, as well as being disposed not only in an intermediate position but also in both ends as far as they are within the scope defined by the intermediate position. The terms "vertical," "horizontal," "left," "right," and the like are used herein for illustrative purposes only.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs. The terminology used herein in the description of the utility model is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.

Referring to fig. 1 to 4, a lumbar isthmus fracture pressurizing and fixing device includes a crossing body 1, a pedicle screw 2, and a pressurizing body 3. The utility model is integrally made of medical titanium alloy. Wherein, pedicle screws 2 are arranged in two, each pedicle screw 2 comprises a U-shaped universal nail tail 22 and a screw 21 connected with one end of the U-shaped universal nail tail 22, and the other end of the U-shaped universal nail tail 22 is arranged as a U-shaped groove. The middle part of the cross connecting body 1 is upwards bent and raised to form a protruding part 11 of an isosceles trapezoid structure, two ends of the waist side bottom of the isosceles trapezoid outwards extend to form the end part of a cylindrical structure, the end part of the cross connecting body 1 is embedded from the side of a U-shaped groove corresponding to the U-shaped universal nail tail 22, a threaded hole is formed in the top of the U-shaped universal nail tail 22, the diameter of the threaded hole is larger than the opening of the U-shaped groove, a threaded hole is provided with a threaded locking bolt 23, one end of the locking bolt 23 is abutted to the corresponding end part of the cross connecting body 1 after being screwed, and the locking bolt is pressed and fixed. When the locking bolt 23 is slightly loosened, both ends of the cross-connecting body 23 can be rotated along the corresponding staple tail 21 to adjust the angle. In order to strengthen the fixing effect and prevent slipping, the outer peripheral side of the end part of the transverse conjoined 1 and the bottom of the U-shaped groove of the U-shaped universal nail tail 22 are all provided with anti-slip lines 12.

The middle part of the pressurizing body 3 is bent to form a V-shaped structure, at least one pressurizing hole 31 is formed in each of two V-shaped end parts of the pressurizing body 3, pressurizing inclined planes 311 in the pressurizing holes 31 face to one side close to the transverse connecting body 1, at least two threaded holes 13 are formed in the middle part of the transverse connecting body 1 at intervals, the threaded holes 13 are distributed on two sides of the protruding portion, one pressurizing hole 31 is detachably connected with the corresponding threaded hole 13 through a pressurizing screw 32, and two ends of the pressurizing body 3 can be fixed on the protruding portion 11 of the transverse connecting body 1. The flange surface of the pressurizing screw 32 is set to be a spherical cambered surface, when the pressurizing screw 32 is screwed down, the flange surface of the pressurizing screw 32 gradually compresses the pressurizing inclined surface 311 of the pressurizing hole 31 in the downward moving process, so that the pressurizing body 3 has pressurizing force tending to the transverse connection 1 to pressurize lumbar spinous processes, and simultaneously, the pressurizing body can provide supporting force tending to upwards and forwards to the spinous processes by matching with the rotation angle rotation adjustment of the transverse connection 1, so that the pressurizing body accords with the pressurizing force in the anatomical direction of isthmus and vertebral lamina, isthmus cracks are reduced, and fusion of bone grafting blocks arranged in the isthmus cracks and isthmus is promoted. The pressurizing body can adjust the opening and closing angles of the V-shaped structure according to the anatomical condition in operation and is connected with the corresponding threaded hole of the transverse connection body, so that the optimal pressurizing force perpendicular to isthmus fissure is obtained.

As a preferable scheme of the utility model, the pressurizing body 3 and the cross connecting body 1 can be manufactured into different specifications according to the operation requirement, in order to adapt to the pressurizing bodies 3 with different specifications, each side of the protruding part 11 of the cross connecting body 1 is provided with two threaded holes 13, the threaded holes 13 at the outer side are used for connecting the pressurizing bodies 3 with large sizes, and the threaded holes 13 at the inner side are used for connecting the pressurizing bodies 3 with small sizes. The pressure body 3 can be shaped with the instrument to conform to the anatomy or to match the superior interbody 1 as the case may be. In order to enable the V-shaped middle part of the pressurizing body 3 to be attached to the lumbar spinous process more easily, an anti-slip stripe is arranged on one side, attached to the spinous process, of the V-shaped middle part of the pressurizing body 3, so that the pressurizing body 3 cannot easily deviate after being clamped on the spinous process, at least two pressurizing holes 31 are formed in each V-shaped end part of the pressurizing body 3, different pressurizing holes 31 are correspondingly adapted to different spinous process positions, accordingly, the pressure to the spinous process can be adjusted, and in the operation process, one of the most suitable pressurizing holes 31 can be selected for connection according to actual needs.

The following will describe the steps of the present utility model in detail:

1) During surgery, the posterior lumbar approach is fully exposed, followed by isthmus fracture repair bone grafting.

2) Two pedicle screws 2 are implanted into the vertebral body, and the needle insertion positions of the two pedicle screws 2 respectively select the junction between the outer side of the articular process on the lumbar vertebra responsibility and the central line of the transverse process or the vertex of the herringbone crest. The cross member 1 and the pressure member 3 of an appropriate specification are selected according to the approximate position.

3) The transverse connection body 1 is connected through the locking bolt 23, and the rotation direction of the transverse connection body 1 is preliminarily adjusted and the locking bolt 23 is pre-tightened.

4) The V-shaped middle part of the pressurizing body 3 bypasses the spinous process, the inner side of the V-shaped middle part of the pressurizing body 3 is tightly attached to the root of the spinous process, two ends of the pressurizing body 3 are connected to the transverse connection body 1, and in the process of continuously tightening the pressurizing screw 32, the pressurizing body 3 has acting force which deflects towards the transverse connection body 1, so that the spinous process is pressurized forwards.

5) If the inner side of the V-shaped middle part of the pressurizing body 4 is not tightly attached to the root of the spinous process, the lateral connecting body 1 can be rotated to the head side by a certain angle by using the surgical forceps, the locking bolt 23 is fixed, the angle of the lateral connecting body 1 is fixed, the spinous process is pressurized upwards for the second time, and the force application direction of the spinous process is adjusted, so that the force application direction accords with the isthmus and the laminboard anatomical direction.

The utility model connects pedicle screws on two sides through the transverse connection, and the whole structure is firm; the middle part of the V-shaped pressurizing body is clamped at the root of the spinous process, and the force application direction accords with the isthmus and vertebral lamina dissection direction through the rotation adjustment of the V-shaped pressurizing hole and the transverse connection body to the head side, so that the isthmus fissure obtains continuous dynamic and balanced pressurizing force perpendicular to the fissure, and the fracture bone grafting fusion is facilitated; the device is fixed by a single vertebral body, has firm structure, is easy to install and is minimally invasive in operation. The surgical position is carried out under the condition of the natural position of the responsible vertebral body or the backward position of the adjusting operation bed, so that the problem that the V-shaped body and the root of the spinous process are loosened due to the micro-gap when the postoperative lumbar vertebra is backward in the above-mentioned publication is avoided, the isthmus pressurizing force is larger when the lumbar vertebra is forward bent, and the continuous dynamic pressurizing of the isthmus and the internal fixation loosening are maximally realized.

The above embodiments are only for illustrating the technical solution of the present utility model and not for limiting the same, and any modifications or equivalent substitutions without departing from the spirit and scope of the present utility model should be covered in the scope of the technical solution of the present utility model.

Claims (7)

1. The lumbar isthmus fracture pressurizing and fixing device is characterized by comprising a transverse connection body, pedicle screws and a pressurizing body; the two pedicle screws comprise U-shaped universal screw tails and screws connected to one ends of the U-shaped universal screw tails, and U-shaped grooves are formed in the other ends of the U-shaped universal screw tails; the two ends of the transverse connection body are detachably connected with the U-shaped grooves of the two U-shaped universal nail tails respectively and can rotate along the corresponding U-shaped groove; the middle part of the pressurizing body is provided with a V-shaped structure, and two ends of the pressurizing body are respectively provided with at least one pressurizing hole; at least two threaded holes are formed in the middle of the transverse connection body at intervals, and one pressurizing hole is detachably connected with the corresponding threaded hole through a pressurizing screw.

2. The lumbar isthmus fracture pressurizing and fixing device according to claim 1, wherein the end part of the cross body is in a cylindrical structure, and the end part of the cross body is embedded from the side of a U-shaped groove corresponding to the U-shaped universal nail tail; the top of U-shaped universal nail tail is equipped with threaded connection's lock bolt, every lock bolt's one end butt compresses tightly the corresponding tip of cross body.

3. The lumbar isthmus pressure fixing device according to claim 2, wherein the lateral connecting body is provided with anti-slip lines on the outer peripheral side of the end portion.

4. The lumbar isthmus pressure fixation device of claim 3, wherein the inside of the bottom of the U-shaped universal nail tail is provided with anti-slip lines.

5. The lumbar isthmus fracture pressurizing and fixing device according to claim 3, wherein the middle part of the transverse connecting body is bent upwards to form a protruding part of an isosceles trapezoid structure, the threaded holes are distributed on two sides of the protruding part, and two threaded holes are formed on each side of the protruding part.

6. The lumbar isthmus pressure fixation device of claim 4, wherein two threaded holes are formed in each side of the bulge of the cross member in spaced apart relation.

7. The lumbar isthmus pressure fixation device of claim 1, wherein each V-shaped end of the pressure body has at least two pressure holes, each pressure hole having a pressure bevel facing toward a side adjacent to the one of the lateral connectors.