CN211094602U

CN211094602U - Universal pedicle screw

Info

Publication number: CN211094602U
Application number: CN201921030661.3U
Authority: CN
Inventors: 李危石
Original assignee: Peking University Third Hospital Peking University Third Clinical Medical College
Current assignee: Peking University Third Hospital Peking University Third Clinical Medical College
Priority date: 2019-07-03
Filing date: 2019-07-03
Publication date: 2020-07-28
Anticipated expiration: 2029-07-03

Abstract

The utility model discloses a be applied to universal pedicle of vertebral arch screw, including coupling nail seat, a screw, plug screw and briquetting, coupling nail seat includes first body and second body, first body is equipped with first through-hole, first through-hole is equipped with first internal thread, the second body is equipped with first blind hole, the axis of revolution of first blind hole is parallel with the axis of revolution of first through-hole, the second body is equipped with U type groove, U type groove is equipped with the second internal thread, the screw is arranged in first through-hole, the biggest external diameter of pin fin is greater than the biggest external diameter of screw body, the pin fin joint is in the one end of first through-hole, the plug screw includes the cock body and fills in the tail, the cock body is equipped with first external screw thread, cock body and stopper tail fixed connection, the one end of filling in tail and cock body coupling is equipped with from the broken groove briquetting one end and is equipped with the concave surface, the briquetting is arranged in first through. The utility model discloses can accomplish under the condition of backbone internal fixation using a connective bar, need not the connective bar of bending, avoid leading to the connective bar intensity to reduce because of the connective bar of bending.

Description

Universal pedicle screw

Technical Field

The utility model relates to the technical field of medical appliances, in particular to an universal pedicle screw.

Background

The nail-rod system is a common implant for spinal internal fixation, and is commonly used for treating internal fixation of thoracolumbar vertebral segment, scoliosis orthopedic fixation and degenerative revision. At present, the fixation of a screw rod system is implemented by firstly implanting a common pedicle screw or a universal pedicle screw at the pedicle of a vertebral arch, then arranging a connecting rod in a U-shaped groove of the pedicle screw, screwing a screw plug into a pedicle screw seat, and then pressing the connecting rod until the fixing is completed.

Through clinical application, the following problems are found: 1. due to the clinical practical conditions, such as different sizes of the coronal plane of the vertebral body in the horizontal direction, non-collinear pedicles of the lateral curved vertebral body in the vertical direction of the coronal plane compared with the adjacent vertebral body and the like, the connecting rod needs to be bent for fixing; 2. the universal pedicle screw fixing mode is that the screw plugs are in contact with the connecting rod, the connecting rod is in contact with the pressing block, and the pressing block is in contact with the screw 3 for pressing and fixing, so that the pressing and contact positions are more, and only one screw plug is used for pressing, so that the loosening phenomenon is often caused, and the fixing operation is failed; 3. when in degenerative revision, two nails and a rod are implanted at the same side of the pedicles of two adjacent vertebral bodies of the degenerative vertebral body for connecting the domino joints, and then the connecting rod is reconnected through the two domino joints, which causes larger secondary trauma.

Disclosure of Invention

Based on this, it is necessary to provide a universal pedicle screw, can use a connective bar to accomplish under the circumstances of backbone internal fixation, need not the connective bar of bending, avoid leading to the connective bar intensity to reduce because of the connective bar of bending to guarantee connective bar intensity, the plug screw compresses tightly screw and connective bar respectively simultaneously, and locking effect is better, makes universal pedicle screw can fix firmly.

The technical scheme is as follows:

a universal pedicle screw, comprising:

the coupling nail seat comprises a first body and a second body, the first body is fixedly connected with the second body, the first body is provided with a first through hole, the first through hole is provided with a first internal thread, the second body is provided with a first blind hole, the rotation axis of the first blind hole is parallel to that of the first through hole, the second body is provided with a U-shaped groove, and the U-shaped groove is provided with a second internal thread;

the screw comprises a nail head and a nail body, the screw is arranged in the first through hole, the maximum outer diameter of the nail head is larger than that of the nail body, and the nail head is clamped at one end of the first through hole;

the plug screw comprises a plug body and a plug tail, the plug body is provided with a first external thread, the plug body is fixedly connected with the plug tail, and one end of the plug tail, which is connected with the plug body, is provided with a self-breaking groove;

the pressing block is arranged in the first through hole, and the concave surface is in contact fit with the pin head.

When the universal pedicle screw is used, the screw can be implanted into a preset position, the coupling screw seat can be adjusted according to the surgical fixing requirement, when the connecting rod can be smoothly arranged in the U-shaped groove, the screw plug can be screwed into the first body, the first external thread and the first internal thread form thread fit, when the screw plug is screwed, the screw plug rotates towards the direction of the screw head along the axis of the first through hole, after the plug body is contacted with the pressing block, the screw plug is continuously screwed, and because the maximum outer diameter of the screw head is greater than the maximum outer diameter of the screw body, and the screw head is clamped at the other end of the first through hole, the pressing block can compress the screw head, so that the coupling screw seat is fixedly connected with the screw. And then screwing the other plug screw into the second body, wherein the first external thread and the second internal thread form thread fit, and the plug screw rotates towards the direction of the connecting rod along the axis of the first blind hole until the plug body presses the connecting rod, so that the fixing process is completed.

Use this universal pedicle of vertebral arch screw to perform the operation, the connective bar need not to bend and can accomplish fixedly, can not reduce the intensity of connective bar, simultaneously the plug screw compresses tightly respectively screw and connective bar, and locking effect is better for universal pedicle of vertebral arch screw can be fixed firm.

The technical solution is further explained below:

in one embodiment, the head is provided with a recess. When the pressing block presses the nail head tightly, the concave surface and the nail head can generate larger friction force, the coupling nail seat and the screw are prevented from loosening, and the fixing is firmer.

In one embodiment, at least two of said recesses are spaced apart in the direction of the axis of said stud.

In one embodiment, the shank is provided with a second external thread. After the screw is implanted into the pedicle of vertebral arch, larger holding force can be provided, and the fixing effect is better.

In one embodiment, the plug tail is provided with a quincunx groove. Therefore, the plug screw can be conveniently screwed into a preset position, and the plug tail can be conveniently screwed off along the self-breaking groove after the plug screw reaches the preset position, so that the plug body compresses the pressing block and the connecting rod, and meanwhile, the plug tail can be taken out, and the size of an implant is reduced.

In one embodiment, the pressing block is provided with a second through hole. Therefore, the nail head can swing in the second through hole, and a larger swing space is provided for the screw.

In one embodiment, the pressing block is provided with an annular groove along the axial direction of the second through hole. Therefore, the area of the side wall of the pressing block can be reduced, and when the pressing block presses the nail head tightly, the pressing block can not be clamped with the first blind hole and the first through hole, so that the pressing block can provide larger pressing force.

Drawings

Fig. 1 is a schematic structural view of the universal pedicle screw of the present invention;

fig. 2 is a schematic structural view of the coupling nail seat of the present invention shown in fig. 1;

FIG. 3 is an exploded view of the universal pedicle screw of FIG. 1;

FIG. 4 is a schematic view of the universal pedicle screw of the present invention in use;

fig. 5 is an overview of the universal pedicle screw according to the present invention.

Description of reference numerals:

100. the coupling nail seat comprises a coupling nail seat body, 110, a first body, 120, a second body, 111, a first through hole, 112, a first internal thread, 121, a first blind hole, 122, a U-shaped groove, 123, a second internal thread, 200, a screw, 210, a nail head, 220, a nail body, 211, a groove, 221, a second external thread, 300, a screw plug, 310, a plug body, 320, a plug tail, 311, a first external thread, 321, a self-breaking groove, 322, a quincunx-shaped groove, 400, a pressing block, 410, a concave surface, 420, a second through hole, 430 and an annular groove.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail with reference to the accompanying drawings and the following detailed description. It should be understood that the detailed description and specific examples, while indicating the scope of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention.

It will be understood that when an element is referred to as being "secured to," "disposed on," "secured to," or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. Further, when one element is considered as "fixed transmission connection" with another element, the two elements may be fixed in a detachable connection manner or in an undetachable connection manner, and power transmission can be achieved, such as sleeving, clamping, integrally-formed fixing, welding and the like, which can be achieved in the prior art, and is not cumbersome. When an element is perpendicular or nearly perpendicular to another element, it is desirable that the two elements are perpendicular, but some vertical error may exist due to manufacturing and assembly effects. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.

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 invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

The references to "first" and "second" in the present invention do not denote any particular quantity or order, but rather are merely used to distinguish one name from another.

As shown in fig. 1 to 4, the utility model provides an universal pedicle screw, include: the coupling nail holder 110 comprises a first body 110 and a second body 120, the first body 110 is fixedly connected with the second body 120, the first body 110 is provided with a first through hole 111, the first body 110 is provided with a first internal thread 112, the first internal thread 112 is arranged along the direction of the rotation axis of the first through hole 111, the second body 120 is provided with a first blind hole 121, the rotation axis of the first blind hole 121 is parallel to the rotation axis of the first through hole 111, the second body 120 is provided with a U-shaped groove 122, the second body 120 is provided with a second internal thread 123, and the second internal thread 123 is arranged along the direction of the rotation axis of the first blind hole 121; the screw 200, the screw 200 includes a nail head 210 and a nail body 220, the screw 220 is disposed in the first through hole 111, the maximum outer diameter of the nail head 210 is greater than the maximum outer diameter of the nail body 220, after the screw 220 is disposed from one end of the first through hole 111, the nail body 220 can pass through the other end of the first through hole 111, and the nail head 210 is clamped at the other end of the first through hole 111; the plug screw 300, the plug screw 300 includes a plug body 310 and a plug tail 320, the plug body 310 is provided with a first external thread 311, one end of the plug body 310 is fixedly connected with the plug tail 320, and a self-breaking groove 321 is arranged at the connection end of the plug tail 320 and the plug body 310; a pressing block 400, wherein a concave surface 410 is arranged at one end of the pressing block 400, the pressing block 400 is arranged in the first through hole 111, and the concave surface 410 is in contact fit with the nail head 210.

When the universal pedicle screw is used, after the screw 200 is implanted into a preset position, the coupling screw seat 100 can be adjusted according to the surgical fixation requirement, when the connecting rod can be smoothly arranged in the U-shaped groove 122, the screw plug 300 can be screwed into the first body 110, the first external thread 311 and the first internal thread 112 form a thread fit, when the screw plug 300 is screwed, the screw plug 300 rotates towards the direction of the screw head 210 along the axis of the first through hole 111, and when the plug body 310 is contacted with the press block 400, the screw plug 300 is continuously screwed, because the maximum external diameter of the screw head 210 is larger than the maximum external diameter of the screw body 220, and the screw head 211 is clamped at the other end of the first through hole 111, the press block 400 can press the screw head 210 tightly, so that the coupling screw seat 100 is fixedly connected with the screw 200. Then, another plug screw 300 is screwed into the second body 120, the first external thread 311 and the second internal thread 123 form a threaded fit, and the plug screw 300 rotates along the axis of the first blind hole 121 towards the direction of the connecting rod until the plug body 310 presses the connecting rod, thereby completing the fixing process.

When the universal pedicle screw is used for operation, the connecting rod can be fixed without bending, the strength of the connecting rod cannot be reduced, and meanwhile, the screw plug 300 compresses the screw 200 and the connecting rod respectively, so that the locking effect is better, and the universal pedicle screw can be fixed firmly.

On the basis of the above embodiment, the nail head 210 is provided with a groove 211. Therefore, when the pressing block 400 presses the nail head 210, the concave surface 410 and the nail head 210 generate a large friction force to prevent the coupling nail seat 100 and the screw 200 from loosening, and meanwhile, the at least two grooves 211 are arranged at intervals along the axial direction of the nail head 210, so that the larger friction force can be generated and the fixation is more firm.

On the basis of the above embodiment, the nail body 220 is provided with a second external thread 221. After the screw is implanted into the pedicle of vertebral arch, larger holding force can be provided, and the fixing effect is better.

On the basis of the above embodiment, the plug tail 320 is provided with a quincunx groove 322. Therefore, the plug 300 can be conveniently screwed into a preset position, and the plug tail 320 can be conveniently screwed off along the self-breaking groove 321 after the plug 300 reaches the preset position, so that the plug body 310 compresses the pressing block 400 and the connecting rod, and meanwhile, the plug tail 320 can be taken out, and the volume of the implant is reduced.

On the basis of the above embodiment, the pressing block 400 is provided with the second through hole 420. In this way, the nail head 210 can swing in the second through hole 420, providing a larger swing space for the screw 200.

On the basis of the above embodiment, the pressing block 400 is provided with an annular groove 430 along the axial direction of the second through hole 420. In this way, the area of the side wall of the pressing block 400 can be reduced, and when the pressing block 400 presses the nail head 210, the pressing block 400 cannot be clamped with the first blind hole 121 and the first through hole 111, so that the pressing block provides larger pressing force.

As shown in fig. 5, the coupling seat of the universal pedicle screw of the present invention can be applied to the following situations: A. when the horizontal size of the vertebral body in the coronal plane is gradually increased, the U-shaped groove 122 for fixing the coupling nail seat 100 in the vertebral body 1 is arranged on the right side, the vertebral body 1 is fixed with a common pedicle screw, and the U-shaped groove 122 for fixing the coupling nail seat 100 in the vertebral body 3 is arranged on the left side, so that the fixation can be completed by ensuring one connecting rod without bending the connecting rod; B. when the vertebral body is bent laterally in the vertical direction in the coronal plane, a common pedicle screw can be fixed on the vertebral body 1 and the vertebral body 3, and the U-shaped groove 122 for fixing the coupling screw seat 100 on the vertebral body 2 is arranged on the right side, so that the fixation can be finished by ensuring one connecting rod without bending the connecting rod; C. when the vertebral body 2 is degenerated and needs to be renovated and fixed, the domino joint is fixed on the original connecting rod, the U-shaped groove 122 for fixing the coupling nail seat 100 in the vertebral body 3 is arranged on the left side, the connecting rod is fixed, and the renovation can be finished by using one universal pedicle screw.

Universal pedicle of vertebral arch screw's beneficial effect:

1) when the universal pedicle screw is applied to thoracolumbar vertebra segment internal fixation and scoliosis orthopedic fixation, even if the horizontal size of a vertebral body in a coronal plane is gradually increased and the vertebral body is bent in the vertical direction in the coronal plane, a plurality of coupling screw seats applied to universal pedicle screws can be implanted, through adjusting the coupling screw seats 100, the surgical fixation is completed by using one connecting rod without bending, the strength of the connecting rod is prevented from being reduced due to bending, and the fixing effect of a screw rod system is improved;

2) when fixed, use two plug screws 300 to compress tightly briquetting 400 and connective bar respectively, the locking effect is better, prevents the pine condition of taking off, improves the fixed reliability of nail stick system.

3) When the degeneration is renovated, a universal pedicle screw is implanted into an adjacent vertebral body, thus the renovation can be completed, the wound of a patient is lightened, and simultaneously, the number of implants is reduced, thereby being beneficial to the rehabilitation of the patient.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. A universal pedicle screw, comprising:

2. The universal pedicle screw according to claim 1, wherein the head is provided with a recess.

3. The universal pedicle screw according to claim 2, wherein at least two of the grooves are spaced apart along the axial direction of the head.

4. The universal pedicle screw according to claim 1, wherein the body is provided with a second external thread.

5. The universal pedicle screw according to claim 1, wherein the plug tail is provided with a quincunx groove.

6. The universal pedicle screw according to claim 1, wherein the pressing block is provided with a second through hole.

7. The universal pedicle screw according to claim 6, wherein the pressing block is provided with an annular groove along the axis of the second through hole.