CN216167781U

CN216167781U - Pedicle screw

Info

Publication number: CN216167781U
Application number: CN202122160234.0U
Authority: CN
Inventors: 刘晓凯; 王卫军; 赵东民
Original assignee: Kanghui Medical Innovation Co ltd
Current assignee: Kanghui Medical Innovation Co ltd
Priority date: 2021-09-07
Filing date: 2021-09-07
Publication date: 2022-04-05
Anticipated expiration: 2031-09-07

Abstract

The utility model relates to a pedicle screw, which comprises a screw seat, an intermediate body and a ball head bone screw, wherein one end of the screw seat is provided with a U-shaped groove; the ball head bone nail is arranged in the screw seat through the middle body; the screw seat can swing relative to the ball head bone nail in the direction vertical to the U-shaped groove, and the screw seat can rotate around the central axis of the screw seat; a central hole is arranged in the ball head bone nail in the axial direction, and a side hole communicated with the central hole is arranged on the side wall of the ball head bone nail. The utility model can be used for injecting bone cement into the vertebral body by a surgeon, ensures the internal fixation effect, avoids the loss of the reduction height of the fractured vertebral body and is particularly suitable for patients with osteoporosis.

Description

Pedicle screw

Technical Field

The utility model belongs to the technical field of orthopedic medical instruments, and particularly relates to a pedicle screw.

Background

Currently, fixed angle pedicle screws and polyaxial pedicle screws are the main pedicle screws for internal fixation of screws after treatment of vertebral fractures. When three or more vertebral bodies are fixed by the pedicle screws with fixed angles, the U-shaped grooves of the pedicle screws after being implanted into the vertebral bodies are not on the same plane, so that the fixing rods are particularly difficult to be in place in the U-shaped grooves of the pedicle screws, and the operation time and the operation risk are increased. The multi-axial pedicle screw overcomes the defects, but is not suitable for spine fracture surgery due to the characteristics of multi-axis, is not favorable for bearing and transmitting force, and easily causes the loss of the correction degree of the postoperative vertebral body.

In addition, for osteoporosis patients, not only is the incidence of fusion failure such as pedicle screw fracture and screw extraction high, but also the reduction height of the fractured vertebral body is easy to lose. Therefore, the common pedicle screw internal fixation can hardly achieve good operation effect.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a pedicle screw to solve the problem that the pedicle screw cannot be effectively applied to an osteoporotic thoracolumbar fracture operation.

A pedicle screw of the utility model is realized by the following steps:

a pedicle screw comprises

One end of the screw seat is provided with a U-shaped groove;

an intermediate of the reaction mixture is used as a reaction mixture,

a ball head bone screw capable of being mounted in the screw seat through an intermediate body;

the screw seat can swing relative to the ball head bone nail in a direction vertical to the U-shaped groove, and the screw seat can rotate around the central axis of the screw seat;

a center hole in the axial direction of the ball head bone nail is formed in the ball head bone nail, and a side hole communicated with the center hole is formed in the side wall of the ball head bone nail.

Furthermore, one end, far away from the ball head, of the ball head bone nail body is provided with cancellous bone threads, one end, close to the ball head, of the ball head bone nail body is provided with cortical bone threads, and the side hole is located at the cancellous bone threads.

Further, the side hole is located the gap department of screw thread on the nail body, just same side of the nail body sets up a side hole at least.

Furthermore, one end of the screw seat, which deviates from the U-shaped groove, is provided with an installation through hole which is positioned in the axial direction of the screw seat and is communicated with the U-shaped groove.

Further, from the place side in U type groove, the installation through-hole includes cylinder hole, sphere hole and dysmorphism hole in proper order, the midbody is installed in the cylinder hole, the bulb cooperation of bulb bone nail is in the sphere hole.

Furthermore, the intermediate body is of an annular structure, an inward concave spherical structure is arranged at one end of the ball head bone nail facing the intermediate body, and the ball head of the ball head bone nail is matched in the spherical structure.

Further, the cross-section of dysmorphism hole is the slotted hole, the major diameter direction of slotted hole with the direction of U type groove is perpendicular, the minor diameter direction of slotted hole with the direction of U type groove is parallel.

Furthermore, the diameter of the ball head bone nail is larger than the short diameter of the long round hole.

Furthermore, a counter bore which is opposite to the inner hole of the intermediate body and communicated with the central hole is arranged on the ball head of the ball head bone nail.

Further, the top in midbody is provided with C type groove, be provided with heavy groove on the both sides outer wall in C type groove, be provided with on the outer wall of screw seat with the heavy groove of being connected that corresponds sinks.

After the technical scheme is adopted, the utility model has the beneficial effects that:

(1) according to the utility model, through the swinging of the screw seat on the horizontal plane and the rotation around the axis direction, the fixing rod can be conveniently placed, the operation time is reduced, the operation risk is reduced, the bearing and the transmission of force can be facilitated, and the condition that the correction degree of the vertebral body is lost after the operation is avoided;

(2) the side hole is arranged on the ball head bone nail, so that a surgeon can conveniently inject bone cement into the vertebral body, the internal fixation effect is ensured, meanwhile, the loss of the reduction height of the fractured vertebral body is avoided, and the ball head bone nail is suitable for patients with osteoporosis.

Drawings

The utility model is further illustrated with reference to the following figures and examples.

FIG. 1 is a cross-sectional view of a pedicle screw of a preferred embodiment of the utility model;

FIG. 2 is an enlarged view of portion A of FIG. 1;

FIG. 3 is a schematic view of the screw receptacle of the pedicle screw of the preferred embodiment of the utility model;

in the figure: the screw comprises a screw seat 1, a U-shaped groove 11, a mounting through hole 12, a cylindrical hole 12-1, a spherical hole 12-2, a special-shaped hole 12-3, a connecting sunken groove 13, a middle body 2, a spherical structure 21, a C-shaped groove 22, a sunken groove 23, a ball head bone nail 3, a central hole 31, a side hole 32, a nail body 33, a ball head 34, cancellous bone threads 35, cortical bone threads 36 and a sunken hole 37.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings of the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention.

Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.

As shown in fig. 1-3, a pedicle screw comprises a screw seat 1, an intermediate body 2 and a ball head bone screw 3, wherein one end of the screw seat 1 is provided with a U-shaped groove 11; the ball head bone nail 3 can be arranged in the screw seat 1 through the intermediate body 2; the screw seat 1 can swing relative to the ball head bone nail 3 in a direction vertical to the U-shaped groove 11, and the screw seat 1 can rotate around the central axis thereof; a central hole 31 is arranged in the ball head bone nail 3 in the axial direction, and a side hole 32 communicated with the central hole 31 is arranged on the side wall of the ball head bone nail 3.

In order to improve the fixing force of the pedicle screw to the vertebral body, one end of the nail body 33 of the ball head bone nail 3, which is far away from the ball head 34, is provided with cancellous bone threads 35, one end of the nail body, which is close to the ball head 34, is provided with cortical bone threads 36, and the side hole 32 is positioned at the cancellous bone threads 35.

The side hole 32 is arranged at the spongy bone thread 35, so that bone cement can be injected into the position of osteoporosis, and the internal fixation effect is ensured.

In order to further improve the fixing effect, the side hole 32 is located at the gap of the screw thread on the nail body 33, and at least one side hole 32 is arranged on the same side surface of the nail body 33.

At least one group of side holes 32 are arranged on the outer side surface of the nail body 33, and the side holes 32 in the same group are positioned on the same side surface of the nail body 33.

In this embodiment, three sets of side holes 32 are disposed on the outer side surface of the nail body 33, the included angle between two adjacent sets of side holes 32 is 120 °, and each set includes two side holes 32.

One end of the screw seat 1 departing from the U-shaped groove 11 is provided with an installation through hole 12 which is positioned in the axial direction and is communicated with the U-shaped groove 11.

The U-shaped groove 11 is arranged for conveniently installing the connecting rod, internal threads are arranged on the inner wall of the U-shaped groove 11, and the connecting rod can be fixed through the matching of a nut and the internal threads after being installed in the U-shaped groove 11.

In order to realize the matched installation of the middle body 2, the ball head bone nail 3 and the screw seat 1, the installation through hole 12 sequentially comprises a cylindrical hole 12-1, a spherical hole 12-2 and a special-shaped hole 12-3 from the side of the U-shaped groove 11, the middle body 2 is installed in the cylindrical hole 12-1, and the ball head 34 of the ball head bone nail 3 is matched in the spherical hole 12-2.

The ball 34 of the ball 34 screw is matched with the spherical hole 12-2, so that the screw base 1 can rotate around the axis direction of the screw base.

In order to realize the matching of the middle body 2 and the ball head bone nail 3 and ensure the relative 360-degree rotation between the ball head bone nail 3 and the screw seat 1, the middle body 2 is of an annular structure, one end of the middle body facing to a ball head 34 screw is provided with a concave spherical structure 21, and the ball head 34 of the ball head bone nail 3 is matched in the spherical structure 21.

In order to realize the swinging of the screw seat 1, the section of the special-shaped hole 12-3 is an oblong hole, the long diameter direction of the oblong hole is perpendicular to the direction of the U-shaped groove 11, and the short diameter direction of the oblong hole is parallel to the direction of the U-shaped groove 11.

When the U-shaped groove 11 is in a horizontal plane state, the long diameter of the oblong hole, namely the inner diameter of the oblong hole in the coronal axis direction, can increase the swing space provided for the screw seat 1 to swing on the horizontal plane, and the short diameter of the oblong hole, namely the inner diameter of the oblong hole in the vertical axis direction, can realize the limit of the screw seat 1 in the sagittal plane direction.

Preferably, the special-shaped holes 12-3 are symmetrical with the major diameter and the minor diameter as symmetry axes.

In order to prevent the ball head 34 screw from falling off the screw base 1, the diameter of the ball head 34 screw is larger than the minor diameter of the oblong hole.

In order to facilitate the injection of bone cement, the ball head 34 of the ball head bone nail 3 is provided with a counter bore 37 opposite to the inner hole of the middle body 2 and communicated with the central hole 31.

When injecting bone cement, can install ball head bone nail 3 earlier and target in place, then inject bone cement into through the hole of midbody 2 and counter bore 37 in to centre bore 31, then bone cement flows out through side opening 32, realizes the high-efficient fixed of centrum and pedicle of vertebral arch screw.

In order to fix the intermediate body 2 and the screw seat 1, a C-shaped groove 22 is formed in the top of the intermediate body 2, sinking grooves 23 are formed in the outer walls of two sides of the C-shaped groove 22, and connecting sinking grooves 13 corresponding to the sinking grooves 23 are formed in the outer wall of the screw seat 1.

In the embodiment, the connecting sinking groove 13 and the sinking groove 23 are riveted, specifically, when installing, firstly, the nail body 33 of the ball head bone nail 3 extends into the installation through hole 12 from the side of the U-shaped groove 11, and passes through the installation through hole 12, so that the ball head 34 thereof is fitted in the spherical hole 12-2, and then the middle body 2 is installed in the cylindrical hole 12-1, so as to fix the ball head bone nail 3. And after installing midbody 2 to screw seat 1 in, the riveting is connected the inner wall of heavy groove 13, presses it into heavy groove 23, can realize midbody 2 and screw seat 1's fixed, avoids it to follow ball head bone screw 3 and rotates.

The screw seat 1 and the intermediate body 2 are not limited to the above-described riveting connection, and the connection may be performed in such a manner that the fixation of the screw seat 1 and the intermediate body 2 can be ensured.

After the ball head bone nail 3 is arranged in a vertebral body, bone cement is injected into the middle hole through the middle body 2 and the counter bore 37, and the bone cement flows out from the side hole 32, so that the connection strength of the pedicle screw and the vertebral body is increased.

After the ball head bone nail 3 and the intermediate body 2 are assembled on the screw seat 1, the screw seat 1 can swing on the horizontal plane and rotate 360 degrees around the central axis of the screw seat, so that a fixing rod can be conveniently placed in, the bearing and the conduction of force are facilitated, and the situation that the vertebral body is distracted and highly lost after an operation is avoided.

In light of the foregoing description of the preferred embodiment of the present invention, many modifications and variations can be made by the worker in the light of the above teachings without departing from the spirit of the utility model. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.

Claims

1. A pedicle screw, comprising

One end of the screw seat (1) is provided with a U-shaped groove (11);

an intermediate (2) of a compound having a structure,

a ball head bone screw (3) which can be mounted in the screw seat (1) through an intermediate body (2);

the screw seat (1) can swing relative to the ball head bone nail (3) in a direction vertical to the U-shaped groove (11), and the screw seat (1) can rotate around the central axis thereof;

be provided with in bulb bone nail (3) and be located its axial direction's centre bore (31), just be provided with on the lateral wall of bulb bone nail (3) with side opening (32) of centre bore (31) intercommunication.

2. The pedicle screw according to claim 1, wherein the ball head bone screw (3) has a cancellous screw thread (35) at an end of the screw body (33) away from the ball head (34), and a cortical screw thread (36) at an end close to the ball head (34), and the side hole (32) is located at the cancellous screw thread (35).

3. The pedicle screw according to claim 2, wherein the side hole (32) is located at a slit of a thread on the shank (33), and at least one side hole (32) is provided on the same side of the shank (33).

4. The pedicle screw according to claim 1, wherein an end of the screw base (1) facing away from the U-shaped groove (11) is provided with a mounting through hole (12) in an axial direction thereof and communicating with the U-shaped groove (11).

5. The pedicle screw according to claim 4, wherein the mounting through hole (12) comprises a cylindrical hole (12-1), a spherical hole (12-2) and a profiled hole (12-3) in sequence from the side of the U-shaped groove (11), the middle body (2) is mounted in the cylindrical hole (12-1), and the ball head (34) of the ball head bone nail (3) is fitted in the spherical hole (12-2).

6. Pedicle screw according to claim 5, characterized in that the intermediate body (2) is of annular configuration and is provided with a concave spherical configuration (21) towards the end of the ball stud (3), the ball (34) of the ball stud (3) fitting within the spherical configuration (21).

7. The pedicle screw according to claim 5, wherein the section of the special-shaped hole (12-3) is an oblong hole, the long diameter direction of the oblong hole is perpendicular to the direction of the U-shaped groove (11), and the short diameter direction of the oblong hole is parallel to the direction of the U-shaped groove (11).

8. The pedicle screw according to claim 7, wherein the ball head (34) of the ball head bone screw (3) has a diameter larger than the minor diameter of the oblong hole.

9. Pedicle screw according to claim 1, characterized in that a counter bore (37) is provided on the ball head (34) of the ball head bone screw (3) opposite the inner bore of the intermediate body (2) and communicating with the central bore (31).

10. The pedicle screw according to claim 1, wherein a C-shaped groove (22) is formed in the top of the middle body (2), sunken grooves (23) are formed in the outer walls of two sides of the C-shaped groove (22), and connecting sunken grooves (13) corresponding to the sunken grooves (23) are formed in the outer wall of the screw base (1).