CN215839728U - Intervertebral fusion cage - Google Patents

Abstract

The patent relates to an interbody fusion cage, which comprises a fusion cage body, wherein the fusion cage body comprises a bone grafting body, an instrument body and a connecting assembly, the bone grafting body is connected with the instrument body through the connecting assembly, and the bone grafting body and the instrument body are arranged along the length direction of the fusion cage body; adjusting the length of the cage body by the connection assembly. The invention realizes the adjustable length of the fusion device, can avoid the change of the operation body position of a patient in the operation and the improper selection of the implant in the operation, improves the fusion rate and effectively reduces the subsidence after the operation.

Description

Intervertebral fusion cage

Technical Field

This patent belongs to medical instrument technical field, relates to an interbody fusion cage, concretely relates to interbody fusion cage with adjustable length.

Background

The spinal interbody fusion is a common technology for treating spinal diseases, including herniated disc, degenerative changes and the like, and is a classic technology for treating various spinal diseases. The interbody fusion cage is usually implanted in a clinical treatment mode and is used as a bone grafting fusion carrier to establish and maintain the stability of the spine and restore the intervertebral height and the physiological curvature of the spine.

The conventional intervertebral cage is composed of a body only, and after being implanted into an intervertebral space, internal fixation (spikes) is required to maintain its stability. Self-stabilization type cervical vertebra fusion devices or zero-incisura cervical vertebra fusion devices exist in the cervical vertebra fusion device series, the type is single, in the operation of doctors, due to the fact that the sizes of the spines of patients are different, the single type fusion device cannot be well matched with the intervertebral discs of the patients, fusion between an upper vertebral body and a lower vertebral body is poor, and accordingly the upper vertebral body and the lower vertebral body are caused to slip. In addition, the lumbar fusion cage is less in self-stabilization type or zero-incisura fusion cage, and after the conventional lateral lumbar interbody fusion cage is implanted into a human body, the conventional lateral lumbar interbody fusion cage needs to be fixed in a lateral screw rod or a screw plate, or the surgical position of a patient needs to be changed and the conventional lateral lumbar interbody fusion cage needs to be fixed in the rear screw rod. Not only increases the operation time and the complication incidence, but also aggravates the pain and the cost of the patient. In addition, the lateral lumbar interbody fusion cage is generally implanted at the outer edge (epiphyseal ring) of the vertebral body, the length dimension design of the lateral lumbar interbody fusion cage is particularly important, and no interbody fusion cage which can be adjusted in the length direction exists at present.

Disclosure of Invention

In view of the above analysis, the present invention is directed to an intervertebral fusion cage, which is used to solve one or more of the problems of the existing intervertebral fusion cage, such as single model, no adjustment of the length of the cage, and high risk of post-operative insertion of plate or screw.

The purpose of the invention is realized as follows:

an intervertebral fusion cage comprises a fusion cage body, wherein the fusion cage body comprises a bone grafting body, an instrument body and a connecting assembly, the bone grafting body is connected with the instrument body through the connecting assembly, and the bone grafting body and the instrument body are arranged along the length direction of the fusion cage body; adjusting the length of the cage body by the connection assembly.

In a preferred embodiment of the present invention, the intervertebral cage further comprises a locking member; fuse the lateral wall terminal surface of ware body and be equipped with the locking piece installing port, the upper surface and the lower surface that fuse the ware body all are equipped with the locking piece passageway with locking piece installing port intercommunication, and the locking piece is reverse contained angle implantation vertebra through the locking piece installing port.

In a preferred embodiment of the present invention, a first connection hole is formed in an end surface of a side wall of the bone grafting body, a second connection hole is formed in an end surface of a side wall of the instrument body, and center lines of the first connection hole and the second connection hole are overlapped; the connecting assembly is arranged in the first connecting hole and the second connecting hole to connect the bone grafting body with the instrument body.

In a preferred embodiment of the present invention, the second connecting hole is located on an end surface of the side wall provided with the mounting opening of the locking member.

In a preferred embodiment of the present invention, the number of the first connecting holes and the number of the second connecting holes are two, and the number of the connecting members is two.

In a preferred embodiment of the present invention, the connecting assembly includes a driving rod, the driving rod includes a rod body and an operating portion, the rod body is a threaded rod; the first connecting hole is a threaded hole, the second connecting hole is a stepped hole, the stepped hole is provided with a first aperture and a second aperture from the instrument body to the bone grafting body, the diameter of the threaded rod is smaller than or equal to the second aperture, and the diameter of the operating part is larger than the second aperture and smaller than or equal to the first aperture.

In a preferred embodiment of the present invention, the connecting assembly includes a track rod having a first end and a second end, the first end is fixed in the first connecting hole, and the second end is fixed in the second connecting hole and is capable of moving in the second connecting hole along the length direction of the fusion cage body.

In a preferred embodiment of the present invention, a hole wall of the first connection hole is provided with a slot, and a hole wall of the second connection hole is provided with a slide way; the first end is provided with a first boss, and the first boss is clamped in the clamping groove; the second end is provided with a second boss, and the second boss is slidably mounted in the slide way.

In a preferred embodiment of the present invention, the track rod is an H-shaped structure and made of a titanium alloy metal material.

In a preferred embodiment of the present invention, two ends of the slide way are provided with blocking portions, and the blocking portions are used for limiting a sliding range of the second boss.

In a preferred embodiment of the invention, the locking element comprises two universal self-locking screws.

In a preferred embodiment of the invention, the locking piece comprises a fixing insertion sheet and a universal self-locking screw; the tail end of the fixing insertion piece is provided with a screw hole, and the universal self-locking screw passes through and is driven into a vertebra through the screw hole.

According to a preferred embodiment of the invention, the number of the fixing insertion pieces is one, and the number of the universal self-locking screws is two; the tail end of the fixing insertion piece is provided with two screw holes.

According to a preferred embodiment of the invention, an embedded groove is formed in the hole wall of the screw hole of the fixing insertion piece, and an elastic structure is arranged on the outer peripheral wall of the head of the universal self-locking screw and can be clamped into the embedded groove.

In a preferred embodiment of the present invention, the fixing insert has a first surface and a second surface, the first surface is a convex surface, and the second surface is a concave surface.

In a preferred embodiment of the present invention, the first surface is provided with convex teeth.

In a preferred embodiment of the invention, the teeth are arranged obliquely towards the rear end of the fixing insert.

In a preferred embodiment of the present invention, the outer surface of the convex tooth is an upper convex arc surface.

In a preferred embodiment of the present invention, the number of the convex teeth is plural and is arranged in a plurality of rows.

In a preferred embodiment of the present invention, the row spacing of the plurality of rows of teeth gradually decreases from the insertion end to the trailing end of the fixing tab.

In a preferred embodiment of the invention, the insertion end of the fixing insertion sheet is of a wedge-shaped structure, and a V-shaped opening is arranged at the central part of the wedge-shaped structure.

According to a preferred embodiment of the invention, the tail end of the fixing insertion piece is provided with a limiting rod, and the limiting rod is used for clamping the tail end of the fixing insertion piece in the mounting opening of the locking piece.

Compared with the prior art, the invention can realize at least one of the following beneficial effects:

a) the interbody fusion cage provided by the invention is innovatively provided with the fusion cage body with the length-adjustable structure, can be applied to a certain specific segment such as cervical vertebra or lumbar vertebra, can effectively solve the problem that the proper length cannot be flexibly selected in the operation due to the single type of the traditional fusion cage, avoids the change of the operation position of a patient in the operation and the improper selection of implants in the operation, improves the fusion rate, and effectively reduces the postoperative subsidence.

b) The interbody fusion cage provided by the invention adopts the driving rod and the track rod to connect the bone grafting body and the instrument body, particularly, the driving rod is connected with the built-in threaded hole of the instrument body through the bone grafting body, the track rod is used for limiting the relative rotation of the bone grafting body and the instrument body and guiding the bone grafting body and the instrument body to relatively freely move along the length direction of the fusion cage, and the relative distance between the bone grafting body and the instrument body can be conveniently and quickly adjusted by controlling the rotation advance and retreat of the driving rod through the structural arrangement, so that the quick and accurate adjustment of the length of the fusion cage body 1 is realized.

c) According to the interbody fusion cage provided by the invention, the hole position used by the driving rod is just the operation hole of the holder, and the interbody fusion cage is reinforced on the basis of ensuring the normal use of the interbody fusion cage, so that the interbody fusion cage can also be adjusted in length, and the hole position can achieve two purposes, so that the operation complexity can be reduced.

d) The interbody fusion cage provided by the invention adopts a mode of combining the inserting sheet and the screw, and the fixing inserting sheet and the universal self-locking screw are mutually locked, so that the fixing inserting sheet can be embedded into the end plate and is locked with the universal self-locking screw to form effective retreat prevention, the risk of separation or displacement of the screw or the inserting sheet after operation can be effectively solved, and the defects that the existing fusion cage adopting the inserting sheet design is difficult to drive and the two wings are easy to break or bend are overcome. Moreover, the doctor can select a proper nail feeding angle according to actual requirements in the operation and adjust the angle of the screw, and can effectively solve the problem that the position of the inserting piece or the fusion device body is difficult to adjust in the operation so as to meet the complex conditions in the operation.

Drawings

In order to more clearly illustrate the embodiments of the present specification or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the embodiments of the present specification, and other drawings can be obtained by those skilled in the art according to the drawings.

FIG. 1 is a first view of the intervertebral cage of the present invention;

FIG. 2 is a second schematic structural view of the intervertebral cage of the present invention;

FIG. 3 is a third schematic structural view of the intervertebral cage of the present invention;

FIG. 4 is a disassembled schematic view of the intervertebral cage of the present invention;

FIG. 5 is a first schematic structural view of the fusion cage body according to the present invention;

FIG. 6 is a schematic structural view of a bone grafting body of the fusion cage body according to the present invention;

FIG. 7 is an end side view of the cage body instrument body of the present invention;

FIG. 8 is a first cross-sectional view of the fusion cage body according to the present invention;

FIG. 9 is a schematic cross-sectional view of the fusion cage body according to the present invention;

FIG. 10 is a schematic structural view of the track bar assembly of the present invention;

FIG. 11 is a first schematic structural view of a fixing tab of the present invention;

FIG. 12 is a second schematic structural view of a fixing tab of the present invention;

FIG. 13 is a schematic structural view of the universal self-locking screw of the present invention;

FIG. 14 is a fourth schematic structural view of the intersomatic cage of the present invention;

FIG. 15 is an internal view of the intersomatic cage of the present invention;

FIG. 16 is a schematic view of the universal self-locking screw and the insert of the present invention;

reference numerals:

1-a fusion cage body; 11-bone grafting body; 12-a drive rod; 13-track rod; 14-an operating part; 15-connecting end faces; 16-an instrument body; 2-fixing the inserting sheet; 21-convex teeth; 22-an embedded groove; 3-universal self-locking screw; 31-elastic construction.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

For the purpose of facilitating understanding of the embodiments of the present application, the following description will be made in terms of specific embodiments with reference to the accompanying drawings, which are not intended to limit the embodiments of the present application.

Example 1

One embodiment of the present invention, as shown in fig. 1-3, discloses an intervertebral fusion cage, which comprises a fusion cage body 1, wherein the length of the fusion cage body 1 is adjustable, as shown in fig. 4-10, the fusion cage body 1 comprises a bone grafting body 11, an instrument body 16 and a connecting assembly, the bone grafting body 11 is connected with the instrument body 16 through the connecting assembly, and the bone grafting body 11 and the instrument body 16 are arranged along the length direction of the fusion cage body 1.

The distance between the bone grafting body 11 and the instrument body 16 is controlled by the adjusting and connecting assembly, the length adjustment of the fusion cage body 1 can be conveniently and quickly realized, and the defect that the length of the fusion cage can be accurately adjusted when the fusion cage which is vertically arranged in the traditional way only can adjust the height of the fusion cage and cannot adjust the length of the fusion cage, so that the side lumbar treatment cannot be met is overcome.

In this embodiment, interbody fusion cage still includes the locking piece, the lateral wall terminal surface of fusion cage body 1 is equipped with the locking piece installing port, and the locking piece installing port sets up in the lateral wall terminal surface of the 16 apparatus bodies of fusion cage body 1, and the upper surface and the lower surface of fusion cage body 1 all are equipped with the locking piece passageway with the locking piece installing port intercommunication, and the locking piece is reverse contained angle implantation vertebra through the locking piece installing port.

Particularly, the locking piece adopts universal self-locking screw 3, and the quantity of universal self-locking screw 3 is 2, and two universal self-locking screws 3 are reverse contained angle implantation vertebra through the locking piece installing port.

In a preferred embodiment of this embodiment, the lateral wall end surface of the bone grafting body 11 and the lateral wall end surface of the instrument body 16 are respectively provided with a first connecting hole and a second connecting hole, the first connecting hole coincides with the center line of the second connecting hole, and the second connecting hole is located on the lateral wall end surface provided with the locking piece mounting port, wherein the first connecting hole is a blind hole, the second connecting hole is a through hole, and the second connecting hole penetrates through the instrument body 16 along the length direction thereof.

Wherein, coupling assembling wholly is shaft-like structure, and coupling assembling can pack into first connecting hole and second connecting hole, and coupling assembling passes the second connecting hole and penetrates first connecting hole and will plant bone body 11 and be connected with apparatus body 16, plants the distance between bone body 11 and the apparatus body 16 through adjusting coupling assembling control to realize fusing the length adjustment of ware body 1.

A preferred embodiment of this embodiment, the quantity of first connecting hole and second connecting hole is two, that is to say, fuse ware main part 1 and be equipped with two sets of connecting holes, it is corresponding, adopt two coupling assembling to connect bone grafting body 11 and apparatus body 16, all be equipped with a coupling assembling in every group connecting hole, every group connecting hole all includes a first connecting hole and a second connecting hole of central line coincidence, and two second connecting holes are located the both sides of locking piece installing port, this structural setting can avoid the relative rotation of bone grafting body 11 and apparatus body 16 that fuses ware main part 1, guarantee the structural stability who fuses ware main part 1.

Because the side wall of the conventional fusion cage body 1 is provided with the holding device operation hole for clamping the fusion cage, the holding device operation hole comprises a first operation hole and a second operation hole, and the first operation hole and the second operation hole are positioned at two sides of the locking piece installation opening. Therefore, in a preferred embodiment of the present embodiment, the first and second gripper operation holes on the fusion cage body 1 correspond to the two second connection holes disposed on the side wall end surface of the instrument body 16, that is, the connection assembly of the present application makes full use of the gripper operation holes on the fusion cage body 1, and the structure of the operation holes can be adapted according to the structure of the connection assembly. Set up the fusion ware length adjustment hole site into holding ware handle hole, simultaneously, fusion ware length adjustment hole site also be with holding ware complex structure, this structure both adjustable fusion ware body 1's length has simplified the structure of fusion ware, convenient operation has reduced the loaded down with trivial details nature of operation moreover.

In this embodiment, the connected mode of coupling assembling and first connecting hole and second connecting hole can adopt plug connection, threaded connection, or the connected mode that plug and screw combined together, coupling assembling includes actuating lever 12 and/or track pole 13, place in the inside fusion ware body 1 in the coupling assembling, the bone grafting body 11 and the apparatus body 16 of fusion ware body 1 can adopt two actuating levers 12 to connect, also can adopt two track poles 13 to connect, can also adopt the connected mode of a actuating lever 12 and a track pole 13 combination.

In the first connection mode, the bone grafting body 11 of the fusion cage body 1 and the instrument body 16 are connected in a threaded connection mode. Specifically, coupling assembling includes two actuating levers 12, actuating lever 12 includes the body of rod and operation portion 14, the body of rod is the threaded rod, first connecting hole is the screw hole, the external screw thread of actuating lever 12 and the internal thread looks adaptation of first connecting hole, the second connecting hole is the shoulder hole, the shoulder hole has first aperture and second aperture to planting bone body 11 direction by apparatus body 16, the diameter less than or equal to second aperture of the body of rod of actuating lever 12, the diameter of operation portion 14 of actuating lever 12 is greater than second aperture and less than or equal to first aperture, place in fusion ware body 1 in advance in actuating lever 12, to plant bone body 11 and apparatus body 16 connection, the front end of actuating lever 12 is located the bone body 11 of planting of fusion ware body 1, operation portion 14 is located the apparatus body 16 of fusion ware body 1.

When the length of the fusion cage body 1 needs to be increased, the two driving rods 12 are screwed at the same time, the driving rods 12 are screwed out in a certain thread length in the bone grafting body 11, the screwed-out lengths of the two driving rods 12 are the same, the distance needed to be increased of the fusion cage body 1 is adjusted, and in the process, the distance between the bone grafting body 11 and the instrument body 16 is changed, so that the length adjustment of the fusion cage body 1 is realized. The length of the fusion cage body is adjusted by adopting a mode that two driving rods 12 are simultaneously spirally pushed and withdrawn, the length can be increased according to the actual requirement of the fusion cage body 1, and the driving rods 12 are screwed for corresponding turns, so that the accurate control and adjustment of the length of the fusion cage body 1 are realized.

It should be noted that, when the bone grafting body 11 and the instrument body 16 are connected by using two driving rods 12, the operating part 14 cooperates with the screwing tool to complete the rotation advance and retreat of the two driving rods 12, and it is noted that the two driving rods 12 are screwed for the same number of turns to ensure that the advance and retreat distances of the two driving rods 12 are consistent.

The second connection mode is that the bone grafting body 11 and the instrument body 16 of the fusion cage body 1 are connected by adopting a mode of combining plug connection and threaded connection, the driving rod 12 is connected with a built-in threaded hole of the instrument body 16 through the bone grafting body 11, the fusion cage is in an initial state, the operating part 14 is embedded into the instrument body 16, the driving rod 12 is pressurized by a surgical instrument and then rotates forwards and backwards, and the driving rod can advance or retreat in the built-in threaded hole of the bone grafting body 11 to complete the adjustment of the length of the fusion cage body 1. Specifically, the connecting assembly comprises a driving rod 12 and a track rod 13, the driving rod 12 and the track rod 13 are both arranged in the fusion device body 1, the fusion device body 1 is provided with two groups of connecting holes, the first group of connecting holes are driving rod mounting holes, the second group of connecting holes are track rod mounting holes, the driving rod 12 is arranged in the first group of connecting holes, and the track rod 13 is arranged in the second group of connecting holes; the bone grafting body 11 and the instrument body 16 of the fusion cage body 1 are tightly connected through the threads of the driving rod 12, wherein the structure and the connection mode of the driving rod 12 refer to the first connection mode; the track pole 13 is used for limiting the relative rotation of the bone grafting body 11 and the instrument body 16 of the fusion cage body 1 and guiding the bone grafting body 11 and the instrument body 16 to move freely along the length direction of the fusion cage relatively, the relative distance between the bone grafting body 11 and the instrument body 16 can be conveniently and quickly adjusted only by controlling the rotation advance and retreat of one driving rod 12, and then the quick and accurate adjustment of the length of the fusion cage body 1 is realized. In addition, the hole site that actuating lever 12 used is just holding ware handle hole, on guaranteeing the normal use of fusion ware on the basis, strengthens it, makes it also can carry out length adjustment, and this hole site sets up two birds with one stone.

When the length of the fusion cage body 1 needs to be increased, the driving rod 12 is screwed, the position of the operating part 14 is not changed, the bone grafting body 11 moves forwards, the distance between the bone grafting body 11 and the instrument body 16 is increased, and when the bone grafting body 11 moves forwards to a required position, the whole length of the fusion cage body 1 is the required length. If the length of the fusion cage body 1 is too long and needs to be adjusted to be short in the operation, the distance between the instrument body 16 and the bone grafting body 11 is reduced by the reverse rotation of the instrument driving rod 12 until the fusion cage body 1 reaches the required length.

In the second connection mode, the maximum adjustable range of the length of the fusion cage body 1 is related to the structures of the driving rod 12 and the track rod 13, and the adjustable fusion cage length is designed as shown in fig. 4-9.

The track rod 13 may have various structures as long as it can cooperate with the driving rod 12 to limit the relative rotation between the bone grafting body 11 and the instrument body 16 and can guide the bone grafting body 11 and the instrument body 16 to move freely along the length direction of the fusion cage.

In a preferred structure of the track rod 13, as shown in fig. 10, the track rod 13 is an H-shaped structure and made of a titanium alloy metal material, and both ends of the track rod 13 of the H-shaped structure can be elastically deformed. Track pole 13 has first end and second end, and in the first end of track pole 13 was fixed in the first connecting hole on the bone grafting body 11, the second end of track pole 13 was located the second connecting hole on the apparatus body 16 to can move along fusion ware body 1 length direction in the second connecting hole.

Further, the pore wall of first connecting hole sets up the draw-in groove, and the pore wall of second connecting hole sets up the slide, and the first end periphery wall of track pole 13 is equipped with first boss, and the periphery wall of second end is equipped with the second boss. During the installation, the opening at extrusion track pole 13 both ends, pack into the first connecting hole of bone grafting body 11 with the first end of track pole 13, pack into the second connecting hole of apparatus body 16 with the second end of track pole 13, the back of packing into, the both ends of track pole 13 reset, first boss fixing clip is located in the draw-in groove of first connecting hole, second boss slidable mounting is in the slide of second connecting hole, and the both ends of slide set up the portion of blockking, a sliding distance for injecing the second boss in the slide of second connecting hole, also can prevent that the second end of track pole 13 from deviating from in the second connecting hole, guarantee bone grafting body 11 and apparatus body 16 and remain connected state all the time, avoid breaking away from in the art, the operational reliability of fusion ware has been guaranteed. In addition, this structural arrangement also enables the length adjustment range of the bone graft body 11 and the instrument body 16 to be limited.

In another preferred structure of the track rod 13, a first end of the track rod 13 is integrally formed with the fusion cage body, a second end of the track rod 13 is provided with an opening, and the track rod is of a half-H-shaped elastic structure, and the length adjustment mechanism of the half-H-shaped track rod 13 is the same as that of the H-shaped track rod 13. That is to say, place in body 1 after track pole 13 need not to process alone again, with track pole 13 and the integrative processing of bone grafting body 11, track pole 13 first end has already been fixed with the inside of bone grafting body 11, and the second end sets up the opening, for half H type structure, and is equipped with the slide rail in the apparatus body 16, can accomplish the relative distance between bone grafting body 11 and the apparatus body 16 through adjusting the half H type structure of second end, accomplishes the length adjustment to fusing ware body 1.

In a preferred embodiment of the present embodiment, the cage body 1 and the rail bar 13 are made of PEEK material.

Compared with the prior art, the intervertebral fusion device of the embodiment has at least the following beneficial effects:

1. by using the fusion cage of the embodiment, the length of the fusion cage body 1 is adjustable, the fusion cage can be applied to a specific segment such as cervical vertebra or lumbar vertebra, and the problem that the proper length cannot be flexibly selected in the operation due to the single type of the traditional fusion cage can be effectively solved.

2. The fusion cage length adjusting hole is arranged on the holder hole, the length of the fusion cage length adjusting hole can be adjusted, and the fusion cage length adjusting hole is matched with the holder, so that the complexity of the operation can be reduced.

Example 2

Still another embodiment of the present invention, as shown in fig. 1-4 and 14-16, discloses an intervertebral cage comprising a cage body 1 and a locking member; the locking piece comprises a fixing insertion piece 2 and a universal self-locking screw 3, the tail end of the fixing insertion piece 2 is provided with a screw hole, and the screw hole is used for the universal self-locking screw 3 to penetrate through and be driven into a vertebra; fuse the lateral wall terminal surface of ware body 1 and be equipped with the locking piece installing port, fuse the upper surface and the lower surface of ware body 1 and be equipped with the screw respectively and penetrate the passageway and fixed inserted sheet penetrates the passageway, the screw penetrates the passageway and penetrates the passageway with fixed inserted sheet and all communicates with the locking piece installing port, fixed inserted sheet 2 and two universal self-locking screw 3 pass through the locking piece installing port and pass the locking piece passageway is reverse contained angle and implants the vertebra.

Utilize fixed inserted sheet 2 and universal self-locking screw 3 to lock mutually and realize the self-stabilization design of integration ware, also can realize the relocking to the inserted sheet when also accomplishing the locking of integration ware through universal self-locking screw 3 promptly, fixed inserted sheet 2 forms mutual locking structure with universal self-locking screw 3 to realize the self-stabilization of integration ware, avoided the integration ware in the use universal self-locking screw 3 or the drop of fixed inserted sheet 2, promoted the stability of integration ware by a wide margin.

The locking piece comprises a fixing insertion piece 2 and a universal self-locking screw 3, a screw hole is formed in the fixing insertion piece 2, the fixing and locking of the fusion cage can be realized by the fixing insertion piece 2 and the universal self-locking screw 3, the number of screws is reduced, and the operation is simpler and more convenient.

The locking piece comprises a fixing insertion piece 2 and two universal self-locking screws 3, two screw holes are arranged on the fixing insertion piece 2 side by side, and the locking structure formed by the two universal self-locking screws and the fixing insertion piece 2 is better in stability.

In this embodiment, the fixing insert 2 has a first surface and a second surface; the first end of the fixed inserting sheet 2 is a head end, namely an inserting end, the second end of the fixed inserting sheet 2 is a tail end, namely a limiting end, the limiting end is provided with a screw hole for the universal self-locking screw 3 to penetrate through and be driven into an upper vertebral body, meanwhile, the side end face of the limiting end is also provided with a limiting rod, the size of the limiting rod is larger than the size of an installation opening of the outer end face of the instrument body 16, so that the limiting end of the fixed inserting sheet 2 is clamped at the installation opening to play a limiting role.

In a preferred embodiment of the present embodiment, the first surface of the fixing insertion piece 2 is a convex surface, the convex surface is provided with a convex tooth 21, and the convex tooth 21 can be clamped into the vertebra to prevent the fixing insertion piece 2 from falling off, so as to play a role of fixing and preventing from falling off; the second surface of the fixed inserting piece 2 is a concave surface, and the concave surface is a smooth surface.

Further, dogtooth 21 sets up towards the tail end slope of fixed inserted sheet 2, and dogtooth 21 is the triangle-shaped arch, the tooth tail of dogtooth 21 and the first face fixed connection of fixed inserted sheet 2, and the tooth tip of dogtooth 21 sets up towards the tail end slope of fixed inserted sheet 2. Preferably, the outer surface of the convex tooth 21 is convex, that is, when the fixing insertion piece 2 is inserted into a vertebra, the contact surface of the convex tooth 21 and the vertebra is convex, and the structure is arranged, so that the insertion piece can be smoothly inserted into the vertebra in a radian, and the discomfort of a patient is reduced.

In a preferred embodiment of the present embodiment, the first surface of the fixing insert 2 is provided with a plurality of rows of convex teeth, and each row of convex teeth is uniformly provided with a plurality of convex teeth 21; by inserting end to the tail end of fixed inserted sheet 2, the row interval of multirow dogtooth diminishes gradually, through setting up the multirow dogtooth that row interval diminishes gradually, not only can make fixed inserted sheet 2 insert the vertebra smoothly, area is comparatively concentrated in the dogtooth embedding centrum for stability is better after the centrum is squeezed into down with the inserted sheet, promotes the effect of moving back of preventing of fixed inserted sheet 2, and patient's uncomfortable sense of reduction that can also the at utmost.

In a preferred embodiment of this embodiment, the inserting end of the fixed inserting sheet 2 is a wedge-shaped structure, the front end of the wedge-shaped structure is narrow, the rear end of the wedge-shaped structure is wide, and the center of the wedge-shaped structure is provided with a V-shaped opening, i.e. the first end of the fixed inserting sheet 2 is provided with a V-shaped notch, when the fixed inserting sheet 2 is driven into a vertebral body, the V-shaped notch at the front end is firstly contacted with the vertebral body, the V-shaped two ends respectively reduce the contact area with the vertebral body, so that the inserting sheet can be driven in more easily, and the anti-falling performance after the inserting sheet is driven in is better.

In a preferred embodiment of the present embodiment, the hole wall of the screw hole of the fixing insertion piece 2 is provided with an insertion groove 22, the peripheral wall of the head of the universal self-locking screw 3 is provided with an elastic structure 31, the insertion groove 22 is matched with the elastic structure 31 at the head of the universal self-locking screw 3, and the elastic structure 31 can be inserted into the insertion groove 22. When the universal self-locking screw 3 penetrates through a screw hole in the fixing insertion sheet 2 and is driven into a proper position in a vertebra, the screw head elastic structure 31 is embedded into the embedded groove 22 of the fixing insertion sheet 2 to complete self-locking of the universal self-locking screw 3, and meanwhile, secondary locking of the fixing insertion sheet 2 is completed by locking of the universal self-locking screw 3. Through the double locking mechanism of the fixed inserting piece 2 and the universal self-locking screw 3, the self-stability performance of the fusion cage is ensured. Because the pore wall of screw hole sets up embedded groove 22, cooperates with the elastic construction 31 of screw head portion, makes universal self-locking screw 3 and has the fine motion design in the position rather than between embedded groove 22, can reach the pressurized effect of power for the bone grafting piece obtains abundant load stimulation, thereby promotes the fusion rate.

The using method comprises the following steps: after the suitable vertebra position of patient was put into to initial condition's fusion cage, with fusion cage length adjustment to suitable position, it is preliminary fixed to fuse the ware to squeeze into centrum down with fixed inserted sheet 2 earlier, uses 2 pieces of universal self-locking screws 3 to squeeze into the centrum through 2 upper portion screw holes of fixed inserted sheet afterwards in proper order, wherein 2 pieces of universal self-locking screws 3 have no nailing order, accomplish the locking. After the universal self-locking screw 3 reaches a proper position, the head elastic structure 31 of the universal self-locking screw 3 is embedded into the embedded groove 22 in the screw hole on the fixed inserting piece 2, and the secondary locking of the inserting piece can be realized while the fusion cage is locked.

Compare with the present integration ware that adopts single screw or single inserted sheet formula, the integration ware of this embodiment adopts the structural design of fixed inserted sheet and universal auto-lock screw interlocking, has apparent advantage, specifically embodies:

1. the mode that adopts inserted sheet and screw to combine through locking mutually between fixed inserted sheet and the universal self-locking screw, fixed inserted sheet can imbed the end plate to form effectively with the locking of universal self-locking screw and prevent moving back, not only can effectively solve the risk that postoperative screw or inserted sheet deviate from or shift, overcome the present integration ware that adopts the inserted sheet design and be that the both wings prevent moving back moreover, it has the defect of squeezing into the difficulty, both wings are easily broken or bend.

2. Adopt the fusion cage of this embodiment, the doctor not only can select suitable nail angle of advancing according to actual demand in the art, adjusting screw angle, but also can effectively solve and be difficult to adjust inserted sheet or fusion cage body position in the art to satisfy the complicated circumstances in the art.

3. The upper surface of the fixed inserting sheet adopts a convex tooth design, the fixed inserting sheet is firstly driven into the lower vertebral body for fixation, and the convex tooth can be clamped into the vertebral bone to prevent the fixed inserting sheet from falling off, thereby playing a role in fixation and retreat prevention.

4. The pore wall through the screw hole at fixed inserted sheet sets up the embedded groove, and universal auto-lock screw head periphery wall sets up integral type elastic construction, and when universal auto-lock screw passed the screw hole on the fixed inserted sheet and squeezes into suitable position in the vertebra, during the screw head elastic construction embedded into fixed inserted sheet head embedded groove, accomplished universal auto-lock screw's self-locking, also utilized universal auto-lock screw's locking to accomplish the secondary locking to fixed inserted sheet simultaneously. Through the dual locking mechanism of fixed inserted sheet and universal self-locking screw, guarantee this design and fuse the self stability ability of ware to because the pore wall of screw hole sets up the embedded groove, with the elastic construction cooperation of screw head, make the micro-motion design in the position of having between universal self-locking screw and the embedded groove thereof, can reach the pressurized effect of power, make the bone grafting piece obtain abundant load stimulation, thereby promote and fuse the rate.

Example 3

Still another embodiment of the present invention, as shown in fig. 1-4 and fig. 14-15, discloses an intervertebral cage, comprising a cage body 1 of embodiment 1 and a locking member of embodiment 2, i.e. the locking member comprises a fixing insert 2 and a universal self-locking screw 3. Specifically, the fusion cage body 1 comprises a bone grafting body 11, an instrument body 16 and a connecting assembly, wherein the bone grafting body 11 is connected with the instrument body 16 through the connecting assembly, and the bone grafting body 11 and the instrument body 16 are arranged along the length direction of the fusion cage body 1; the locking piece is including fixed inserted sheet 2 and universal auto-lock screw 3, the tail end of fixed inserted sheet 2 is equipped with the screw hole, the screw hole supplies universal auto-lock screw 3 to pass and squeezes into the vertebra.

In this embodiment, fuse the lateral wall terminal surface of ware body 1 and be equipped with the locking piece installing port, fuse the upper surface and the lower surface of ware body 1 and be equipped with the screw respectively and penetrate the passageway and fixed inserted sheet penetrates the passageway, the screw penetrates the passageway and penetrates the passageway with fixed inserted sheet and all communicate with the locking piece installing port, fixed inserted sheet 2 and universal self-locking screw 3 are reverse contained angle through the locking piece installing port and implant the vertebra.

In a preferred embodiment of this embodiment, the locking piece includes a fixed inserted sheet 2 and two universal self-locking screws 3, is equipped with two screw holes on the fixed inserted sheet 2 side by side, and through the auto-lock structure that two universal self-locking screws 3 and a fixed inserted sheet 2 formed, stability is better.

In a preferred embodiment of the present embodiment, the bone grafting body 11 of the fusion cage body 1 and the device body 16 are connected by a combination of a plug connection and a screw connection. Specifically, the connection assembly comprises a driving rod 12 and a track rod 13, the structure, connection relationship and operation process of the driving rod 12 and the track rod 13 are described in embodiment 1, and the relative distance between the bone grafting body 11 and the instrument body 16 can be conveniently and quickly adjusted by controlling the rotation of the driving rod 12, so as to realize the quick and accurate adjustment of the length of the fusion cage body 1.

The operation steps of the intervertebral fusion device using the embodiment are as follows:

step 1: the Chinese medicine root is used for the operation by selecting a proper approach mode according to a patient and implanting the fusion cage in an initial state into a proper intervertebral space position. The fusion cage is initially in an unadjusted state, and the track rod 13 is in a locked state, at which time the fusion cage body 1 is at its original shortest length.

Step 2: judging whether the length position of the fusion device is proper or not through the X-ray image, and if so, not adjusting the length; if the length position is not suitable, the length is required to be adjusted.

When the original shortest length of the fusion cage body 1 does not meet the requirements of a patient, the length of the fusion cage body 1 needs to be adjusted, a doctor carries out screwing operation on the built-in driving rod 12 through a corresponding surgical instrument, so that the operating part 14 of the driving rod 12 is attached to and pressurized by the connecting end surface 15 of the bone grafting body 11, the driving rod 12 is controlled to rotate forwards and backwards within a certain thread length, the driving rod 12 realizes the change of the position of the adjusting rod 13 through the change of the thread position, and further the length of the fusion cage body 1 within a certain range is increased, shortened and adjusted until the length of the fusion cage is adjusted to a proper position.

And step 3: after will fusing ware body 1 and adjust suitable length, use fixed inserted sheet 2 to squeeze into through the locking piece installing port that fuses ware body 1, accomplish the preliminary stability to fusing the ware.

And 4, step 4: 2 universal self-locking screws 3 are driven into through the screw holes at the tail parts of the fixing insertion pieces 2 in sequence, when the screw is proper in position, head elastic structures of the universal self-locking screws are embedded into embedded grooves in screw holes of the fixing insertion pieces 2, self-locking of the universal self-locking screws 3 is completed, and secondary locking of the fixing insertion pieces 2 is also completed by means of locking of the universal self-locking screws 3. Through the double locking mechanism of the fixed inserting piece 2 and the universal self-locking screw 3, the self-stability performance of the fusion cage is ensured.

And 5: and if the length adjustment is not needed, sequentially completing the step 3 to the step 4.

Compared with the prior art, the interbody fusion cage of the embodiment is innovatively provided with the fusion cage body in a length-adjustable structure from the viewpoint of clinical practical operation requirements and realization of safe and convenient implantation of products, can be applied to a certain specific segment such as cervical vertebra or lumbar vertebra, can effectively solve the problem that the proper length cannot be flexibly selected in the operation due to single type of the traditional fusion cage, avoids the change of the operation position of a patient in the operation and the improper taking out of implants in the operation, improves the fusion rate, and effectively reduces the postoperative subsidence; and, adopt the mode of fixed inserted sheet and screw interlocking locking, and the hole of getting is held to the rational utilization integration ware, parallel design formula as an organic whole self stabilization formula (zero incisura) interbody fusion ware, fixed inserted sheet can imbed the end plate, and form effective anti-retreat with universal self-locking screw locking, not only can effectively solve the risk that postoperative screw or inserted sheet deviate from or shift, and overcome current integration ware that adopts the inserted sheet design and be the both wings and prevent moving back and lead to its to squeeze into the difficulty, the defect that both wings are easily broken or are bent, it is single to have solved interbody fusion ware in the multi-angle from the multi-angle, the problem that postoperative inserted sheet or screw deviate from the risk height, stability is better.

The above-mentioned embodiments, objects, technical solutions and advantages of the present application are described in further detail, it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present application, and are not intended to limit the scope of the present application, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present application should be included in the scope of the present application.

Claims (10)

1. An intervertebral fusion cage is characterized by comprising a fusion cage body (1), wherein the fusion cage body (1) comprises a bone grafting body (11), an instrument body (16) and a connecting assembly, the bone grafting body (11) is connected with the instrument body (16) through the connecting assembly, and the bone grafting body (11) and the instrument body (16) are arranged along the length direction of the fusion cage body (1);

the length of the fusion cage body (1) is adjusted by the connecting assembly.

2. An intersomatic cage according to claim 1, further comprising a locking member;

fuse the lateral wall terminal surface of ware body (1) and be equipped with the locking piece installing port, the upper surface and the lower surface of fusing ware body (1) all are equipped with the locking piece passageway with locking piece installing port intercommunication, and the locking piece is reverse contained angle implantation vertebra through the locking piece installing port.

3. The intersomatic cage according to claim 2, wherein the lateral wall end face of the bone grafting body (11) is provided with a first connecting hole, the lateral wall end face of the instrument body (16) is provided with a second connecting hole, and the first connecting hole coincides with the center line of the second connecting hole;

the connecting assembly is arranged in the first connecting hole and the second connecting hole to connect the bone grafting body (11) and the instrument body (16).

4. An intersomatic cage according to claim 3, characterized in that the second coupling hole is provided in the end face of the side wall in which the locking member mounting opening is provided.

5. An intersomatic cage according to claim 3, characterized in that the first and second connection holes are each two in number and the connection members are two in number.

6. Intersomatic cage according to claim 5, characterized in that the connection assembly comprises a drive rod (12), the drive rod (12) comprising a rod body which is a threaded rod and an operating portion (14);

the first connecting hole is a threaded hole, the second connecting hole is a stepped hole, the stepped hole is provided with a first hole diameter and a second hole diameter in the direction of the bone grafting body (11) from the instrument body (16), the diameter of the threaded rod is smaller than or equal to the second hole diameter, and the diameter of the operating part (14) is larger than the second hole diameter and smaller than or equal to the first hole diameter.

7. An intersomatic cage according to claim 5 or 6, characterized in that the connecting assembly includes a rail rod (13), the rail rod (13) having a first end fixed in the first connecting hole and a second end fixed in the second connecting hole and movable therein along the length of the cage body (1).

8. An intersomatic cage according to claim 7, characterized in that the hole wall of the first connection hole is provided with a slot and the hole wall of the second connection hole is provided with a slideway;

the first end is provided with a first boss, and the first boss is clamped in the clamping groove;

the second end is provided with a second boss, and the second boss is slidably mounted in the slide way.

9. Intervertebral cage according to claim 8, characterized in that the rail rod (13) is of H-shaped configuration, made of titanium alloy metal material.

10. An intersomatic cage according to claim 8, characterized in that stops are provided at both ends of the slideway for limiting the sliding range of the second boss.

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