CN211911777U

CN211911777U - Vertebral pedicle screw capable of correcting kyphosis deformity and vertebral pedicle screw group

Info

Publication number: CN211911777U
Application number: CN201922342725.XU
Authority: CN
Inventors: 许国华; 牛东阳; 何强龙; 鲍小刚; 刘佳; 郭超
Original assignee: Shanghai Changzheng Hospital
Current assignee: Shanghai Changzheng Hospital
Priority date: 2019-12-24
Filing date: 2019-12-24
Publication date: 2020-11-13
Anticipated expiration: 2029-12-24

Abstract

The utility model discloses a vertebral pedicle screw capable of correcting kyphosis and a vertebral pedicle screw group, which comprises a screw body, a screw tail and two blades with internal threads; a first U-shaped concave surface is processed at the tail end of the screw tail, and a height difference is formed at two ends of the first U-shaped concave surface to form a first communicating slope; the nut comprises a thread block and a lower pressing block which can be relatively and rotatably connected; the thread block is provided with an external thread matched with the internal thread of the blade, and the thread block can rotate and move in the blade along the thread direction; one end of the lower pressing block is connected with the thread block in a relatively rotating mode, the other end of the lower pressing block faces the screw tail, a second U-shaped concave surface is machined at one end facing the screw tail, and height differences are formed at two ends of the second U-shaped concave surface to form a second continuous slope surface; the inclination direction and the inclination angle of the first consecutive slope surface and the second consecutive slope surface are the same. The accurate reduction of different compression degrees is realized through the nail tail of different slopes, effectively corrects the kyphosis deformity that chest lumbar vertebrae fracture led to.

Description

Vertebral pedicle screw capable of correcting kyphosis deformity and vertebral pedicle screw group

Technical Field

The utility model relates to a pedicle screw, concretely relates to pedicle screw capable of correcting kyphosis deformity.

Background

In recent years, with the development of medicine and biomechanics and the emergence of various novel internal fixation instruments and modes, the pedicle screw implantation reduction internal fixation has become a common means for treating thoracolumbar fractures. The vertebral pedicle screw can penetrate through the anterior-middle-posterior three columns of the spine, the deformity correction and the vertebral injury fixation can be realized through the posterior surgery, and the vertebral pedicle screw has the advantages of small surgical trauma, easiness in exposure, simplicity in operation, reliability in fixation and the like, thoracolumbar fractures are mostly buckling injuries, whether the most common buckling-compression injuries or buckling-stretching injuries can cause the vertebral injury and adjacent sections to generate different degrees of posterior convex deformity, the traditional posterior vertebral pedicle screw reduction realizes the height recovery of the vertebral injury mostly in a stretching or pressurizing mode, researches show that the average orthopedic degree of the posterior surgery on the sagittal plane is only 1.8, and the traditional vertebral pedicle screw is limited in the capacity of correcting the posterior convex deformity of the thoracolumbar fractures and the capacity of maintaining the height after the reduction. Although efforts have been made to distract, the correction of the kyphosis is not obvious.

SUMMERY OF THE UTILITY MODEL

In order to solve the problem that the current chest lumbar vertebrae way of escape resets internal fixation and is difficult to the kyphotic deformity that the correction chest lumbar vertebrae fracture leads to, the utility model provides a can correct spine kyphotic deformity pedicle of vertebral arch screw plans before the art and accomplishes the back, selects the screw of suitable screw slope, realizes the accurate of different compression degree through the nail tail of different slopes and resets, effectively corrects the kyphotic deformity that chest lumbar vertebrae fracture leads to.

The technical scheme of the utility model is that: the pedicle screw capable of correcting the kyphosis deformity comprises a screw body, a screw tail and two blades with internal threads; the screw tail is integrally connected to the tail end of the screw body, and the two blades are integrally connected to the two sides of the screw tail; a first U-shaped concave surface is processed at the tail end of the screw tail, and height differences are formed at two ends of the first U-shaped concave surface to form a first communicating slope;

the nut comprises a thread block and a lower pressing block which can be relatively and rotatably connected; the thread block is provided with an external thread matched with the internal thread of the blade, and the thread block can rotate and move in the blade along the thread direction; one end of the lower pressing block is connected with the thread block in a relatively rotating mode, the other end of the lower pressing block faces the screw tail, a second U-shaped concave surface is machined at one end facing the screw tail, and height differences are formed at two ends of the second U-shaped concave surface to form a second continuous slope surface; the inclination direction and the inclination angle of the first consecutive slope surface and the second consecutive slope surface are the same.

Furthermore, a connecting shaft is arranged at one end, connected with the thread block, of the lower pressing block, a groove matched with the connecting shaft is formed in one end, connected with the lower pressing block, of the thread block, and the connecting shaft is inserted into the groove. The two can be connected in a relatively rotating way.

Furthermore, the inclination angle of the first continuous slope surface and the second continuous slope surface is 2-25 degrees.

Further, the inclination angles of the first continuous slope surface and the second continuous slope surface are 2.5 °, 5 °, 7.5 °, 10 °, 12.5 °, 15 ° or 20 °.

Further, the threads on the rear side of the screw body are of a dense design.

The utility model discloses still provide and to correct kyphosis malformation pedicle of vertebral arch screw group, including 1 ordinary pedicle of vertebral arch screw and two can correct kyphosis malformation pedicle of vertebral arch screws.

The utility model has the advantages that:

1. after planning before the art is accomplished, select the screw of suitable screw slope, realize the accurate of different compression degrees through the nail tail of different slopes and reset, effectively correct the kyphosis deformity that chest lumbar vertebrae fracture led to.

2. Compared with the common pedicle screw, the vertebral arch pedicle screw has the advantages of the common pedicle screw, can realize the fixation of the anterior, middle and posterior three columns of the vertebral column through posterior surgery, and does not increase the difficulty and operation time of the surgery.

3. The screw thread at the rear side of the screw body adopts a dense design, and the holding force between the screw body and the cortical bone after being placed can be further increased aiming at the situation that thoracolumbar fracture is mostly caused by senile osteoporosis patients.

4. The operation is simple, and the reduction can be realized directly through the process of screwing the nut on the upper rod.

5. The concave surface in the arc of firm locking back nail tail and nut lower extreme combines effectively with the connective bar, prevents that the nail stick is not hard up, reduces the postoperative and restores to the throne and loses the rate.

6. The screw has simple structure and is convenient to produce.

Drawings

FIG. 1 is a schematic view of the overall structure of a pedicle screw for correcting kyphosis;

FIG. 2 is a front view of the screw tail and nut assembly without the blade;

FIG. 3 is a side view of the screw tail and nut assembly with the blade removed;

fig. 4 is a rear view of the screw tail and nut with the blade omitted.

Detailed Description

The present invention will be further described with reference to the accompanying drawings.

As shown in fig. 1-4, a novel pedicle screw capable of correcting kyphosis comprises a screw body, a screw tail, two blades with internal threads and a nut. Because of the chest lumbar fracture is sent to old osteoporosis patient more, consequently the screw thread of screw body rear side adopts intensive design, can increase put the nail back with the power of controlling of cortex bone, 2 integral types in 1 tail end of screw body are connected to screw tail, and 3 integral types in 2 both sides in screw tail are connected to two blade 3. The tail end of the screw tail 2 is provided with a first U-shaped concave surface 5, and the two ends of the first U-shaped concave surface 5 are provided with height differences to form a first communicating slope. The screw is of unidirectional design.

The nut tail is designed with a common long tail structure and a percutaneous screw long tail sleeve, the lower end of the inner side of the nut tail is provided with threads for screwing the nut, the long tail structure is designed to be easily broken, the common long tail structure meets the requirement of an open type operation, and the percutaneous long tail sleeve is suitable for the implantation of a percutaneous pedicle screw.

The nut includes a threaded block 41 and a hold-down block 42 that are rotatably coupled relative to each other. The screw block 41 is a conventional nut structure, the screw block 41 has an external thread matching with the internal thread of the blade 3, and the screw block 41 can rotate and move in the blade 3 along the screw direction. One end of the lower pressing block 42 is connected with the thread block 41 in a relatively rotating mode, the other end faces the screw tail 2, a second U-shaped inner concave surface 6 is machined at one end facing the screw tail 2, and height differences are formed at two ends of the second U-shaped inner concave surface 6 to form a second consecutive slope surface. The inclination direction and the inclination angle of the first consecutive slope surface and the second consecutive slope surface are the same. One end of the lower pressing block 42 connected with the thread block 41 is provided with a connecting shaft, one end of the thread block 41 connected with the lower pressing block 42 is provided with a groove matched with the connecting shaft, and the connecting shaft is inserted into the groove. The two can be connected in a relatively rotating way. During the screwing process, the thread block is pushed towards the tail of the screw along the internal thread of the blade 3, and the lower pressing block can keep the direction unchanged, cannot rotate along with the thread block, but can be pushed downwards at the same time to generate downward pressure.

According to different angles of the kyphotic deformity needing to be corrected, the slope degrees of the first connected slope surface of the screw tail and the second connected slope surface of the lower pressing block are designed with different specifications of 2.5 degrees, 5 degrees, 7.5 degrees, 10 degrees, 12.5 degrees, 15 degrees, 20 degrees and the like, and the screw body is also designed with various diameter specifications like the conventional thoracolumbar pedicle screw.

The working principle and the using process are as follows: the degree of the convex deformity before the operation and the degree after the prospective correction are measured, and the pedicle screw with the proper slope is selected according to the degree difference. The operation in-process is at first putting into the ordinary pedicle of vertebral arch screw that the afterbody does not have the slope in hindering the vertebra, then put into in the upper and lower adjacent vertebra that hinders the vertebra the utility model discloses a novel screw, should make the housing screw U-shaped groove that is formed by two blades after putting the nail lie in the sagittal plane, pay attention to simultaneously and ensure to hinder that it is domatic should be in the low tail end high state of head end behind putting the nail into the screw that vertebra head side adjacent vertebra was put into, and novel screw is rather opposite to what the adjacent vertebra of tail side was put into, and it is domatic to be in the high tail end low state. Placing a connecting rod with proper length, fixing the injured vertebra screw by using a common nut and pre-locking, simultaneously screwing nuts on upper and lower adjacent vertebra at two sides, ensuring that the slope angle of the lower end of the nut is consistent with the tail end of the screw, gradually screwing the nut, enabling the connecting rod to generate an angular spreading force along the slope of the screw, driving the backward convex to reset, locking the nut and breaking off the tail piece of the screw after the resetting degree and the position of the screw are satisfied in perspective.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and decorations can be made without departing from the principle of the present invention, and these improvements and decorations should also be regarded as the protection scope of the present invention.

Claims

1. Can correct kyphosis malformation pedicle of vertebral arch screw, its characterized in that: comprises a screw body (1), a screw tail (2) and two blades (3) with internal threads; the screw tail (2) is integrally connected to the tail end of the screw body (1), and the two blades (3) are integrally connected to two sides of the screw tail (2); a first U-shaped concave surface (5) is processed at the tail end of the screw tail (2), and a height difference is formed at two ends of the first U-shaped concave surface (5) to form a first communicating slope;

comprises a nut, wherein the nut comprises a thread block (41) and a lower pressing block (42) which can be connected in a relatively rotating way; the thread block (41) is provided with an external thread matched with the internal thread of the blade (3), and the thread block (41) can rotate and move in the blade (3) along the thread direction; one end of the lower pressing block (42) is connected with the thread block (41) in a relatively rotating mode, the other end of the lower pressing block faces the screw tail (2), a second U-shaped inner concave surface (6) is machined at one end facing the screw tail (2), and height differences are formed at two ends of the second U-shaped inner concave surface (6) to form a second continuous slope surface; the inclination direction and the inclination angle of the first consecutive slope surface and the second consecutive slope surface are the same.

2. The pedicle screw for correcting kyphosis according to claim 1, wherein: one end of the lower pressing block (42) connected with the thread block (41) is provided with a connecting shaft, one end of the thread block (41) connected with the lower pressing block (42) is provided with a groove matched with the connecting shaft, and the connecting shaft is inserted into the groove.

3. The pedicle screw for correcting kyphosis according to claim 1, wherein: the inclination angle of the first continuous slope surface and the second continuous slope surface is 2-25 degrees.

4. The pedicle screw for correcting kyphosis according to claim 3, wherein: the inclination angles of the first continuous slope surface and the second continuous slope surface are 2.5 degrees, 5 degrees, 7.5 degrees, 10 degrees, 12.5 degrees, 15 degrees or 20 degrees.

5. Can correct the kyphosis malformation pedicle of vertebral arch screw group, its characterized in that: comprising 1 common pedicle screw and two pedicle screws for correcting kyphosis according to any one of claims 1-4.