CN219070588U

CN219070588U - Extension type pedicle screw

Info

Publication number: CN219070588U
Application number: CN202222808647.XU
Authority: CN
Inventors: 周立金; 梁伟时
Original assignee: Beijing Chaoyang Hospital
Current assignee: Beijing Chaoyang Hospital
Priority date: 2022-10-24
Filing date: 2022-10-24
Publication date: 2023-05-26
Anticipated expiration: 2032-10-24

Abstract

The utility model provides an extension type pedicle screw which comprises a hinged support, a ball screw, an extension arm and a connecting rod, wherein the top end of the ball screw is in spherical hinge with the inside of the hinged support, one end of the extension arm is buckled with the top end of the hinged support, and the connecting rod is installed at one end of the extension arm far away from the hinged support in a penetrating manner along the radial direction of the hinged support. The ball head screw is connected with the hinged support in a ball hinged manner, so that universal rotation of the hinged support can be realized, extension arms with different lengths can be selected to change the passing position of the connecting rod according to requirements during use, the connecting rod is prevented from generating larger bending, the phenomenon of breakage is avoided, the connecting rod has the smallest bending angle under the premise of not affecting the correction effect, the risk of breakage of the connecting rod can be greatly reduced, a more stable correction effect is provided for a scoliosis patient, and the extension pedicle screw prevents the connecting rod from passing through the tail of the pedicle screw, so that soft tissues of a patient with spinal deformity can be better protected.

Description

Extension type pedicle screw

Technical Field

The utility model relates to the technical field of spinal correction tools, in particular to an extension type pedicle screw.

Background

Posterior pedicle screw endoprosthesis is a standard procedure for correcting spinal deformities. The posterior rod system currently in use, the orthopedic rod passes through the pedicle screw with the nut attached. For patients with severe spinal deformity, huge kyphosis angle and vertebral body rotation are often accompanied, and the complications of rod fracture are very easy to occur due to the large bending degree of the fixing rod passing through the top vertebral area after the operation; meanwhile, due to the rotation of the vertebral body, the condition that the convex side and the concave side are not equal in height is frequently caused in the vertebral jacking area, the bending degree of the rod at the side with higher bulge is larger, and the breakage of the rod is easier to occur.

Disclosure of Invention

The utility model aims to provide an extension type pedicle screw, which can change the passing position of a connecting rod and avoid the situation of fracture caused by larger bending of the connecting rod.

The utility model provides an extension type pedicle screw which comprises a hinged support, a ball screw, an extension arm and a connecting rod, wherein the top end of the ball screw is in spherical hinge with the inside of the hinged support, one end of the extension arm is buckled on the top end of the hinged support, and the connecting rod is installed at one end, far away from the hinged support, of the extension arm in a penetrating manner along the radial direction of the hinged support.

Further, the extension arm includes first connecting seat, extension rod and second connecting seat, the bottom spiral-lock of first connecting seat is in the top of hinge support, first connecting seat passes through fastening screw to be fixed the top of hinge support, the second connecting seat sets up keep away from on the extension rod the one end of first connecting seat.

Further, the second connecting seat is of a cylindrical structure, a U-shaped groove is formed in the top end of the second connecting seat along the radial direction of the second connecting seat, the connecting rod is installed in the U-shaped groove, and a thread groove for installing the locking cap is formed in the top end of the second connecting seat.

Further, the width of the U-shaped groove is the same as the diameter of the connecting rod.

Further, the top end of the ball head screw is provided with a ball head part, and the top end of the ball head part is provided with an inner hexagonal groove.

Further, the bottom inside the hinge support has offered semi-open ball socket, bulb portion install in inside the ball socket, the diameter of bulb portion with the diameter of ball socket is the same, the top central point of hinge support puts and has offered along its axial and run through to the first screw hole of ball socket, be equipped with along its axial on the first connecting seat with the second screw hole that first screw hole corresponds, first connecting seat with pass through between the hinge support fastening screw with the second screw hole with the cooperation fixed connection of first screw hole.

Further, the first connecting seat, the extension rod and the second connecting seat are of an integrated structure.

Further, a boss is arranged at the top end of the hinged support, an external thread is arranged on the outer side of the boss, and an internal thread matched with the external thread is arranged on the inner wall of the bottom end of the first connecting seat.

Further, a compression pad is arranged at the top end of the connecting rod in the threaded groove, and an arc-shaped groove is formed in the bottom end of the compression pad.

Further, the pressing pad is of a circular structure, and the diameter of the pressing pad is the same as that of the thread groove.

Compared with the prior art, the technical scheme of the utility model has the following beneficial effects: the ball head screw is connected with the hinged support through the ball hinge, so that universal rotation of the hinged support can be realized, and extension arms with different lengths can be selected to change the passing position of the connecting rod according to requirements during use, so that the phenomenon that the connecting rod generates large bending and breaks is avoided, the connecting rod has the minimum bending angle on the premise of not affecting the correcting effect, the breaking risk of the connecting rod can be greatly reduced, and a more stable correcting effect is provided for scoliosis patients.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present utility model, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of the overall structure of the present utility model;

FIG. 2 is a cross-sectional view of the present utility model;

reference numerals illustrate: 1-ball screw, 101-ball part, 2-hinged support, 201-boss, 3-extension arm, 301-first connecting seat, 302-extension rod, 303-second connecting seat, 304-thread groove, 4-connecting rod, 5-fastening screw, 6-locking cap, 7-clamp pad.

Detailed Description

The technical solutions of the present utility model will be clearly and completely described in connection with the embodiments, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments. 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.

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more of the described features. In the description of the present utility model, the meaning of "a plurality" is two or more, unless explicitly defined otherwise. Furthermore, the terms "mounted," "connected," "coupled," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

Example 1

As shown in fig. 1-2, an extended pedicle screw comprises a hinged support 2, a ball screw 1, an extension arm 3 and a connecting rod 4, wherein the top end of the ball screw 1 is provided with a ball head 101, the bottom end in the hinged support 2 is provided with a semi-open ball socket, the ball head 101 is arranged in the ball socket, the diameter of the ball head 101 is the same as that of the ball socket, the top end of the ball screw 1 is hinged in the hinged support 2, and the hinged support 2 can rotate at multiple angles so as to adapt to the passing position of the connecting rod 4.

The extension arm 3 includes integrated into one piece's first connecting seat 301, extension rod 302 and second connecting seat 303, and the bottom cartridge of first connecting seat 301 is on the top of hinge support 2, and the first screw hole that runs through to the ball and socket is seted up along its axial in the top central point of hinge support 2 put, is equipped with the second screw hole that corresponds with first screw hole along its axial on the first connecting seat 301, through the cooperation fixed connection of fastening screw 5 with second screw hole and first screw hole between first connecting seat 301 and the hinge support 2, makes first connecting seat 301 pass through fastening screw 5 to be fixed on the top of hinge support 2.

The top end of the bulb part 101 is provided with an inner hexagonal groove, which is convenient for the bulb screw 1 to be implanted into a human body for tightening and fixing by a hexagonal wrench,

the second connecting seat 303 is cylindrical structure, and the U type groove has been seted up along its radial to the top of second connecting seat 303, and connecting rod 4 installs in U type inslot, makes connecting rod 4 joint U type inslot after, connecting rod 4 perpendicular to extension rod 302 to U type groove width is the same with the diameter of connecting rod 4, avoids connecting rod 4 to install and produces after U type groove and rocks.

The top of the second connecting seat 303 is provided with a thread groove 304 for installing the locking cap 6, and the diameter of the thread groove 304 is larger than the width of the U-shaped groove. The screw thread groove 304 is inside install and compress tightly pad 7 on the top of connective bar 4, compress tightly the bottom of pad 7 and offered the arc groove the same with connective bar 4 diameter, compress tightly pad 7 and be circular structure, compress tightly pad 7 diameter and screw thread groove 304's diameter the same, lock cap 6 compresses tightly connective bar 4 through compressing tightly pad 7 under the cooperation effect of screw thread groove 304 during the installation, compress tightly pad 7 and can use the silica gel material to make.

Example 2

Compared with embodiment 1, this embodiment is characterized in that: the top of the hinged support 2 is provided with a boss 201, the outer side of the boss 201 is provided with external threads, the inner wall of the bottom end of the first connecting seat 301 is provided with internal threads matched with the external threads, and the connection stability between the whole support arm and the hinged support 2 is enhanced through threaded connection between the first connecting seat 301 and the boss 201, so that the load of a screw is reduced.

The use principle is as follows:

before installation, firstly, the extension arms 3 of the extension rods 302 with different lengths are selected according to the requirements of different positions, then the ball screw 1 is implanted into a human body, the rotation position of the hinge support 2 is adjusted, the rotation position is fixed by screwing in the fastening screw 5, the bottom end of the fastening screw 5 can be made into a circular arc structure with the same diameter as the ball head 101, the bottom of the fastening screw 5 is abutted against the ball head 101 after the fastening screw 5 is completely screwed, the hinge support 2 is further fixed, then the whole continuous connecting plate is sequentially clamped into the U-shaped groove on the second connecting seat 303, and finally the pressing pad 7 is installed at the top end of the connecting rod 4 and then screwed and fixed through the locking cap 6. The extension type pedicle screw prevents the connecting rod 4 from penetrating through the tail part of the pedicle screw and prevents the connecting rod 4 from being excessively bent, so that the soft tissues of a patient with the spinal deformity can be better protected.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present utility model, and not for limiting the same; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the utility model.

Claims

1. The utility model provides an extension formula pedicle of vertebral arch screw, its characterized in that includes hinge support, bulb screw, extension arm and connective bar, the top ball hinge of bulb screw in the inside of hinge support, the one end of extension arm spiral-lock in the top of hinge support, the connective bar is followed the radial run-through of hinge support install in the extension arm is kept away from the one end of hinge support.

2. The extending pedicle screw of claim 1, characterized in that the extension arm comprises a first connection seat, an extension rod and a second connection seat, the bottom end of the first connection seat is buckled on the top end of the hinged support, the first connection seat is fixed on the top end of the hinged support through a fastening screw, and the second connection seat is arranged on the extension rod at one end far away from the first connection seat.

3. The extension pedicle screw of claim 2, wherein the second connecting seat is of a cylindrical structure, a U-shaped groove is formed in the top end of the second connecting seat along the radial direction of the second connecting seat, the connecting rod is installed in the U-shaped groove, and a thread groove for installing a locking cap is formed in the top end of the second connecting seat.

4. The extended pedicle screw of claim 3, characterized in that the U-shaped slot is the same width as the diameter of the connecting rod.

5. The extending pedicle screw of claim 2, characterized in that the top end of the ball screw is provided with a ball head part, the top end of which is provided with an internal hexagonal groove.

6. The extending pedicle screw of claim 5, wherein a semi-open ball socket is formed at the bottom end of the inside of the hinged support, the ball head is mounted in the ball socket, the diameter of the ball head is the same as that of the ball socket, a first threaded hole penetrating through the ball socket is formed in the center of the top end of the hinged support along the axial direction of the first threaded hole, a second threaded hole corresponding to the first threaded hole is formed in the first connecting seat along the axial direction of the first connecting seat, and the first connecting seat and the hinged support are fixedly connected with the second threaded hole and the first threaded hole in a matched mode through the fastening screw.

7. The extending pedicle screw of claim 2, wherein the first connection mount, the extension rod and the second connection mount are of unitary construction.

8. The extension pedicle screw of claim 2, characterized in that the top end of the hinged support is provided with a boss, the outer side of the boss is provided with an external thread, and the inner wall of the bottom end of the first connecting seat is provided with an internal thread matched with the external thread.

9. The extension pedicle screw of claim 3, characterized in that the screw thread groove is internally provided with a compression pad at the top end of the connecting rod, and the bottom end of the compression pad is provided with an arc-shaped groove.

10. The extending pedicle screw of claim 9, wherein the compression pad is of circular configuration, the compression pad diameter being the same as the diameter of the thread groove.