CN219461544U

CN219461544U - Artificial vertebral plate

Info

Publication number: CN219461544U
Application number: CN202320121084.9U
Authority: CN
Inventors: 董亚龙; 刘建国; 张勋
Original assignee: Beijing Naton Medical Technology Holdings Co Ltd
Current assignee: Beijing Naton Medical Technology Holdings Co Ltd
Priority date: 2023-02-06
Filing date: 2023-02-06
Publication date: 2023-08-04
Anticipated expiration: 2033-02-06

Abstract

The utility model discloses an artificial vertebral plate, which belongs to the technical field of orthopedic implants, and comprises a plate body, wherein an upper screw hole is formed in the upper end of the plate body, and a vertebral body screw used for fixing an upper vertebral body in an adjacent vertebral body is arranged in the upper screw hole; the lower end of the plate body is provided with a lower screw hole, and a vertebral body screw used for fixing a lower vertebral body in the adjacent vertebral bodies is arranged in the lower screw hole; the outer surface of the plate body is provided with a spinous process connecting plate which is used for being connected between the split spinous processes. The utility model is suitable for multi-segment vertebral plates, can reserve the spinous process segments, and has good spinous process fusion effect.

Description

Artificial vertebral plate

Technical Field

The utility model relates to the technical field of orthopedic implants, in particular to an artificial vertebral plate.

Background

Laminectomy is a relatively common surgical procedure for spinal surgery, and generally refers to the removal of some or all of the lamina from the posterior aspect of the spine, exposing the spinal canal and clearing the interior of the spinal canal of the patient. But the vertebral lamina can destroy the post structure of the vertebral column after excision, so that the spine is unstable, and part of patients form large scar tissues in the vertebral lamina defect area and adhere with the dura mater and nerve roots, thereby involving and pressing nerves and seriously affecting the long-term effect of the spine operation.

The artificial vertebral plate is an artificial implant used for implant repair of the cut or missing part when the rear or rear outer side structure of the vertebral plate of the human spine is cut or missing due to other reasons such as pathological changes and the like. The artificial vertebral plate has a preventive effect on secondary scar adhesion caused after laminectomy, which causes the compression of the dural sac and nerve roots, restenosis after laminectomy and instability of the spine.

The artificial vertebral plate is used for spinal posterior decompression, tumor and other operation diseases. Traditional products (such as patent document CN208598588U, CN 217014182U) are mostly integrated vertebral plates, are rigidly supported and fixed by matching with screws, and meanwhile, peripheral muscle groups of spinal spinous processes need to be stripped, and certain damage can be caused by removing the spinous processes. The existing artificial vertebral plate has at least the following problems: (1) Is suitable for single-segment laminectomy, but is not suitable for multi-segment laminectomy; (2) the spinous process segment cannot be reserved, and the original muscle group is damaged; (3) Individual spinous processes are implanted back into the product, and the surface of the spinous process loses fusion effect.

Disclosure of Invention

The utility model aims to solve the technical problem of providing an artificial vertebral plate which is suitable for a multi-segment vertebral plate, can reserve spinous process segments and has good spinous process fusion effect.

In order to solve the technical problems, the utility model provides the following technical scheme:

an artificial vertebral plate comprising a plate body, wherein:

the upper end of the plate body is provided with an upper screw hole, and a vertebral body screw used for fixing an upper vertebral body in the adjacent vertebral bodies is arranged in the upper screw hole;

the lower end of the plate body is provided with a lower screw hole, and a vertebral body screw used for fixing a lower vertebral body in the adjacent vertebral bodies is arranged in the lower screw hole;

the outer surface of the plate body is provided with a spinous process connecting plate which is used for being connected between the split spinous processes.

Further, the plate body includes lower base member and last base member, wherein:

the lower base body is provided with a first sliding groove which is concave, is provided with an opening at the upper end and extends along the length direction of the first sliding groove;

the two sides of the upper base body are provided with first sliding rails matched with the first sliding grooves;

the plate body is provided with a limiting device for limiting the movable range of the lower base body and the upper base body;

the lower screw hole is positioned on the lower basal body, the upper screw hole is positioned on the upper basal body, and the spinous process connecting plate is connected to the outer surface of the upper basal body.

Further, an elastic piece is arranged between the lower base body and the upper base body, one end of the elastic piece is connected to the lower base body, and the other end of the elastic piece is connected to the upper base body.

Further, the elastic element is a spring, wherein:

the lower base body is provided with a first spring stretching boss and a spring compression boss positioned below the first spring stretching boss, and the lower end of the spring is connected with the first spring stretching boss and the spring compression boss;

and/or, the inner surface of the upper base body is provided with a concave spring accommodating groove with an opening at the lower end, the upper wall of the spring accommodating groove is used as a spring compression plane, a second spring stretching boss is arranged below the upper wall of the spring accommodating groove, and the upper end of the spring is connected with the second spring stretching boss and is abutted to the spring compression plane;

and/or, the spinous process connecting plate is detachably connected to the outer surface of the upper base body;

and/or a plurality of bone growth holes are arranged on the spinous process connecting plate.

Further, a spring screwing notch is arranged between the second spring stretching boss and the side wall of the spring accommodating groove;

and/or the number of the springs is two, the springs are respectively positioned at the left side and the right side of the spring accommodating groove, and a partition plate for separating the two springs is arranged in the middle of the spring accommodating groove.

Further, the limiting device is a positioning pin protruding from the inner surface of the upper substrate, and the lower substrate is provided with a positioning pin sliding groove extending along the length direction and matched with the positioning pin.

Further, the width of the first sliding groove is larger than that of the upper base body at the first sliding rail, and the width of the locating pin sliding groove is larger than the diameter of the locating pin.

Further, the outer surface of the upper base body is provided with a second sliding groove with an inward concave shape and an opening at the upper end, two sides of the bottom of the spinous process connecting plate are provided with second sliding rails matched with the second sliding groove, and the upper base body is also provided with a locking device for locking the spinous process connecting plate.

Further, a positioning hole is formed in the bottom of the spinous process connecting plate, the locking device is the positioning pin, and the top end of the positioning pin extends into the positioning hole;

and/or, the thickness of the spinous process connection plates taper from bottom to top;

and/or, two sides of the upper end of the upper base body are provided with a pair of upper oblique lugs, two sides of the lower end of the lower base body are provided with a pair of lower oblique lugs, and the upper oblique lugs and the lower oblique lugs are respectively provided with an upper screw hole and a lower screw hole;

and/or, the upper screw hole and the lower screw hole are oblique oblong holes;

and/or the inner surfaces of the upper basal body and the lower basal body are arc-shaped which are fit with the physiological radian of the human sagittal plane spine.

Further, the centrum screw includes the nail pole, the upper portion of nail pole has set firmly the spacing ring, the upper surface of spacing ring is used for with the lower surface butt of each base member in corresponding screw hole department, the nail pole is in the part of spacing ring below is equipped with the bone screw thread, the nail pole is in the part of spacing ring top is equipped with the cooperation screw thread, be connected with the nut on the cooperation screw thread, the lower surface of nut is used for with the upper surface butt of each base member in corresponding screw hole department.

The utility model has the following beneficial effects:

the upper end of the plate body is used for being fixed to the upper vertebral body in the adjacent vertebral bodies, and the lower end of the plate body is used for being fixed to the lower vertebral body in the adjacent vertebral bodies, so that the artificial vertebral plate can be applied to multi-segment vertebral plates; the outer surface of the plate body is provided with a spinous process connecting plate which is used for being connected between the split spinous processes, the original spinous processes are split in operation, the spinous process segments can be reserved, and the damage to the spinous process peripheral muscle groups is avoided; the two side surfaces of the spinous process connecting plate are used for connecting split spinous processes, so that the spinous processes (bones) can be conveniently attached and fixed, and the rapid bone fusion can be realized, and the fusion effect is good.

Drawings

FIG. 1 is a schematic view of an exploded construction of an artificial lamina of the present utility model;

FIG. 2 is a schematic view of the assembled structure of the artificial lamina of FIG. 1, wherein (a) is a perspective view and (b) is a side view;

FIG. 3 is a schematic view of the lower substrate of FIG. 1, wherein (a) is a perspective view of one direction and (b) is a perspective view of the other direction;

FIG. 4 is a schematic view of the upper base of FIG. 1, wherein (a) is a perspective view and (b) is an inside elevation view and shows a partially enlarged structure;

fig. 5 is a schematic view of the structure of the spinous process connector plate of fig. 1;

FIG. 6 is a schematic view of the spring of FIG. 1;

FIG. 7 is a schematic view of the structure of the vertebral screw of FIG. 1, wherein (a) is a structural view of the shank and (b) is a structural view of the nut;

FIG. 8 is a schematic view of the motion state of the artificial lamina of FIG. 1;

FIG. 9 is a schematic diagram of the mating structure of the lower and upper substrates of FIG. 1, wherein (a) is a cross-sectional view in one direction and (b) is a cross-sectional view in the other direction;

FIG. 10 is a schematic view of the connection of one end of the spring of FIG. 1;

fig. 11 is a schematic diagram showing the dimensional relationship between the lower base and the upper base in fig. 1 at the mating position of the first sliding groove and the first sliding rail.

Detailed Description

In order to make the technical problems, technical solutions and advantages to be solved more apparent, the following detailed description will be given with reference to the accompanying drawings and specific embodiments.

In the description of the present utility model, it should be understood that the directions or positional relationships indicated by the terms "upper", "lower", "front", "rear", "left", "right", etc., are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

The present utility model provides an artificial lamina, as shown in fig. 1-11, comprising a plate body, wherein:

the upper end of the plate body is provided with an upper screw hole 21 (in particular, two sides of the plate body are provided with a pair of upper screw holes 21), and a vertebral body screw 4 for fixing an upper vertebral body in the adjacent vertebral bodies is arranged in the upper screw hole 21;

the lower end of the plate body is provided with a lower screw hole 11 (in particular, two sides of the plate body are provided with a pair of lower screw holes 11), and a vertebral body screw 4 for fixing the lower vertebral body in the adjacent vertebral body is arranged in the lower screw hole 11;

the outer surface of the plate body is provided with a spinous process connecting plate 3 for connecting between the split spinous processes. The spinous process connecting plate 3 can be fixedly connected or detachably connected; the spinous process connecting plate 3 may be provided with a plurality of bone (fusion) growing holes 31 to promote bone fusion.

During operation, the original spinous process is firstly split, the peripheral muscle group is not stripped and damaged, the vertebral plate part (without the spinous process) is cut off in a conventional mode, then the artificial vertebral plate is implanted, the upper end of the plate body is attached to the upper vertebral body in the adjacent vertebral body, the lower end of the plate body is attached to the lower vertebral body in the adjacent vertebral body, then the vertebral body screw 4 is screwed in from the upper screw hole 21 and the lower screw hole 11 of the plate body to fix the plate body, and finally the split spinous process is fixed on the two side surfaces of the spinous process connecting plate 3 (particularly, the split spinous process can be fixed through a suture line, a cable and the like). The spinous process can be selected according to the operation requirement whether to be implanted back, so that the spinous process connecting plate 3 can be also selected according to the operation requirement whether to be detached.

In the present utility model, the artificial lamina may be formed as a unitary non-mobile lamina configured in a variety of sizes, however, to achieve non-rigid fixation, as shown in fig. 1-4, it is preferred that the lamina comprises a lower base 1 and an upper base 2, wherein:

the lower base body 1 is provided with a first sliding groove 12 which is concave, is provided with an opening at the upper end and extends along the length direction;

the two sides of the upper base body 2 are provided with first slide rails 22 matched with the first slide grooves 12;

the plate body is provided with a limiting device for limiting the movable range of the lower base body 1 and the upper base body 2;

the lower screw hole 11 is located on the lower base 1, the upper screw hole 21 is located on the upper base 2, and the spinous process connecting plate 3 is connected to the outer surface of the upper base 2.

When in use, the upper base body 2 is inserted from the opening at the upper end of the first sliding groove 12 of the lower base body 1, the lower base body 1 and the upper base body 2 form sliding connection through the first sliding groove 12 and the first sliding rail 22, and the limiting device on the plate body can limit the moving range of the lower base body 1 and the upper base body 2.

Thus, the artificial vertebral plate is of a split structure, the lower base body and the upper base body are in sliding connection in a sliding groove-sliding rail matching mode, the whole artificial vertebral plate is non-rigid and fixed, and original physiological activities of the vertebral column can be reserved.

Furthermore, an elastic piece can be arranged between the lower base body 1 and the upper base body 2, one end of the elastic piece is connected to the lower base body 1, and the other end of the elastic piece is connected to the upper base body 2, so that elastic fixation can be realized due to the arrangement of the elastic piece, and the use effect is better.

In specific implementation, the elastic member may be a spring 5, and the connection between two ends of the spring may be made by various ways that those skilled in the art will easily think, and for convenience of implementation, the following structural form may be adopted:

in order to facilitate the connection of the lower end of the spring 5, as shown in fig. 3 and 9, a first spring stretching boss 13 and a spring compression boss 14 positioned below the first spring stretching boss 13 may be arranged on the lower substrate 1, the lower end of the spring 5 is connected with the first spring stretching boss 13 and the spring compression boss 14, specifically, the lower end of the spring 5 is clamped in a gap formed between the first spring stretching boss 13 and the spring compression boss 14 in a first circle, so as to realize the functions of stretching and compression stress;

in order to facilitate the connection of the upper end of the spring 5, as shown in fig. 4 and 9, the inner surface of the upper substrate 2 may be provided with a concave spring accommodating groove 27 with an opening at the lower end, the upper wall of the spring accommodating groove 27 is used as a spring compression plane 24, a second spring stretching boss 23 is disposed below the upper wall of the spring accommodating groove 27, the upper end of the spring 5 is connected with the second spring stretching boss 23 and abuts against the spring compression plane 24, and specifically, the first ring at the upper end of the spring 5 is clamped in a gap formed between the spring compression plane 24 and the second spring stretching boss 23 (refer to fig. 10), so as to realize stretching and compression stress functions. At this time, a spring screw-in notch 26 may be provided between the second spring tension boss 23 and the side wall of the spring receiving groove 27 to facilitate the loading of the spring 5.

Thus, when the lower base 1 and the upper base 2 slide relatively, tension and compression force can be applied by the internal spring 5.

To improve the elastic effect, the springs 5 may be two as shown in the embodiment, and are respectively located at the left and right sides of the spring accommodating groove 27; a partition plate 25 for separating the two springs 5 may be provided at the middle of the spring receiving groove 27 to avoid the springs 5 from interfering with each other. At this time, the first spring tension boss 13 and the spring compression boss 14 are correspondingly two groups, and the spring compression plane 24 and the second spring tension boss 23 are also two groups.

The limiting device on the plate body is used for limiting the movable ranges of the lower base body 1 and the upper base body 2, and can adopt various modes which are easy to think of a person skilled in the art, and for convenient implementation, the following structural forms can be adopted:

as shown in fig. 1, 3-4 and 9-10, the limiting device is a positioning pin 6 protruding from the inner surface of the upper base 2, and the lower base 1 is provided with a positioning pin chute 15 extending along the length direction and matching with the positioning pin 6. Reference numeral 29 in the drawing denotes a dowel pin mounting hole.

To meet the requirement of physiological activities in multiple dimensions, the width of the first sliding groove 12 is preferably (slightly) larger than the width of the upper base 2 at the first sliding rail 22 (see fig. 11), and the width of the positioning pin sliding groove 15 is preferably larger than the diameter of the positioning pin 6. The two dimensional differences can be flexibly designed according to the needs, for example, the two dimensional differences are all 2mm. Thus, a certain (e.g. 2 mm) range of motion on one lateral side can be achieved.

In order to reduce the size of the plate body and improve the fixing firmness, two sides of the upper end of the upper base body 2 can be provided with a pair of upper inclined lugs, two sides of the lower end of the lower base body 1 can be provided with a pair of lower inclined lugs, and the upper screw hole 21 and the lower screw hole 11 are respectively arranged on the upper inclined lugs and the lower inclined lugs. In order to solve the problems of single position and no adjustment range of the fixing screw in the prior art, the upper screw hole 21 and the lower screw hole 11 are preferably oblique oblong holes (such as oval slots) shown in the figure, and the width and the length of the oblique oblong holes can be both larger than the diameter of the cone screw 4, so that the cone screw 4 has a certain movement range in the screw hole, the adaptation range of cone differences of different cases is increased, and the cone screw 4 can be locked at any position.

Thus, as shown in fig. 8, the artificial vertebral plate according to the embodiment of the utility model is elastically fixed, can satisfy multi-dimensional physiological activities of stretching, compressing and twisting, and has a maximum activity position limitation.

In order to facilitate the detachable connection of the spinous process connecting plate 3 on the plate body, as shown in fig. 1-2 and fig. 4-5, the outer surface of the upper base body 2 may be provided with a second sliding groove 28 with an inner concave shape and an open upper end, two sides of the bottom of the spinous process connecting plate 3 are provided with second sliding rails 32 matched with the second sliding groove 28, and the upper base body 2 is further provided with a locking device for locking the spinous process connecting plate 3.

When in use, the spinous process connecting plate 3 is inserted from the opening at the upper end of the second sliding groove 28 of the upper base body 2, the spinous process connecting plate 3 and the upper base body 2 form sliding connection through the second sliding rail 32 and the second sliding groove 28, and the spinous process connecting plate 3 can be locked through the locking device after being installed in place. When the spinous process connecting plate 3 needs to be detached, the locking device can be unlocked, and the spinous process connecting plate 3 can be detached at any time.

Here, the locking means may be in various forms, such as a screw, etc., and for convenience of implementation, the bottom of the spinous process connecting plate 3 may be provided with a positioning hole 33, the locking means is the positioning pin 6, and the top end of the positioning pin 6 extends into the positioning hole 33.

In the present utility model, the thickness of the spinous process junction plate 3 may be gradually thinned from the bottom to the top (refer to fig. 5) to secure the strength of the spinous process junction plate 3 and to enhance the bone fusion effect. The inner surfaces of the upper base body 2 and the lower base body 1 can be in bionic design and are arc-shaped (refer to the broken line shown in (b) of fig. 2) which is fit with the physiological radian of the sagittal plane spine of the human body so as to improve the adhesion of the plate body.

In order to facilitate the fixation of a plate body more flexibly during operation, unlike conventional screws, as shown in fig. 7, the vertebral screw 4 in the present utility model preferably comprises a shank 40, a limiting ring 41 is fixedly arranged at the upper part of the shank 40, the upper surface of the limiting ring 41 is used for being abutted against the lower surface of each base body at the corresponding screw hole (refer to fig. 10), a bone thread 42 is arranged at the part of the shank 40 below the limiting ring 41, a matching thread 43 is arranged at the part of the shank 40 above the limiting ring 41, a nut 44 is connected to the matching thread 43, and the lower surface of the nut 44 is used for being abutted against the upper surface of each base body at the corresponding screw hole (refer to fig. 2, 9 (b) and fig. 11). When in use, the nail placement position can be determined firstly, and the fixed plate body is connected after the vertebral screw 4 is implanted, so that the plate body can be adjusted more flexibly, and the use requirement in the operation is fully met.

While the foregoing is directed to the preferred embodiments of the present utility model, it will be appreciated by those skilled in the art that various modifications and adaptations can be made without departing from the principles of the present utility model, and such modifications and adaptations are intended to be comprehended within the scope of the present utility model.

Claims

1. An artificial vertebral plate comprises a plate body, and is characterized in that,

2. The artificial vertebral plate of claim 1 wherein the plate body comprises a lower base and an upper base, wherein:

3. The artificial vertebral plate of claim 2 wherein an elastic member is disposed between the lower and upper substrates, one end of the elastic member being attached to the lower substrate and the other end of the elastic member being attached to the upper substrate.

4. The artificial lamina of claim 3, wherein the elastic member is a spring, wherein:

5. The artificial vertebral plate of claim 4 wherein a spring threading gap is provided between the second spring extension boss and the side wall of the spring receiving pocket;

6. The artificial vertebral plate of claim 2 wherein said stop means is a pin protruding from an inner surface of said upper body, and said lower body has a pin slot extending along a length thereof and engaging said pin.

7. The artificial lamina of claim 6, wherein the first sliding groove has a width greater than a width of the upper base at the first rail and the dowel groove has a width greater than a diameter of the dowel.

8. The artificial vertebral plate of claim 6 wherein the outer surface of the upper base is provided with a second sliding groove with an inward recess and an opening at the upper end, second sliding rails matched with the second sliding groove are arranged on two sides of the bottom of the spinous process connecting plate, and a locking device for locking the spinous process connecting plate is further arranged on the upper base.

9. The artificial vertebral plate of claim 8 wherein the bottom of the spinous process connection plate has a locating hole, the locking device is the locating pin, and the top end of the locating pin extends into the locating hole;

and/or, the upper screw hole and the lower screw hole are oblique oblong holes;

10. The artificial vertebral plate of claim 2 wherein the vertebral body screw comprises a shank, a stop collar is fixedly arranged on the upper portion of the shank, the upper surface of the stop collar is used for being abutted against the lower surface of each base body at a corresponding screw hole, bone threads are arranged on the portion of the shank below the stop collar, mating threads are arranged on the portion of the shank above the stop collar, a nut is connected to the mating threads, and the lower surface of the nut is used for being abutted against the upper surface of each base body at a corresponding screw hole.