Split type zero-incisura fusion cage system

Abstract

The utility model discloses a split-type zero-incisura fusion cage system, which comprises a fusion cage, which comprises a main body and an anti-falling mechanism, the main body extends in the first direction and is provided with a bone grafting groove extending in the second direction, and the second direction is perpendicular to the first direction; the anti-falling mechanism comprises two anti-falling pieces, the anti-falling pieces are detachably connected with the main body, the anti-falling pieces are provided with elastic pieces, and the elastic pieces of the two anti-falling pieces are symmetrically distributed on the two sides of the bone grafting groove; the transmission mechanism comprises a first transmission part and a second transmission part, the first transmission part is detachably connected with the main body, the first transmission part is used for moving the main body to the to-be-inserted position, and the second transmission part is detachably connected with the anti-falling part and used for moving the anti-falling part to the to-be-inserted position; a limiting part is arranged on the side, close to the cone, of the conveying mechanism and abuts against the front edge of the cone to improve the stability of the conveying mechanism in the conveying process. The vertebral body end plate is prevented from being damaged, and the stability of the fusion cage is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of medical apparatus and instruments, in particular to a split type zero incision fusion system. BACKGROUND

[0002] Anterior cervical discectomy and fusion (ACDF) is the most common method for the treatment of cervical spondylosis, which can effectively reconstruct the intervertebral space and intervertebral foramen height, has the advantages of sufficient decompression, firm fixation, small trauma, recovery of cervical physiological curvature, etc., and is considered as the "gold standard" for the treatment of cervical spondylosis.

[0003] Due to the thickness of the anterior cervical titanium plate, it is difficult to avoid postoperative complications while improving the bone graft fusion rate. In recent years, with the continuous improvement of manufacturing technology, the incision of the anterior cervical titanium plate has been significantly reduced compared to before. Despite this, postoperative patients will still have throat discomfort and even difficulty swallowing, degeneration of the adjacent vertebral body of the fusion segment, and even internal fixation slippage and fracture. To solve the above problems, the prior art combines the anterior cervical titanium plate with the fusion cage to obtain a zero incision fusion cage.

[0004] However, the zero incision fusion cage in the prior art is mainly a traditional screw locking type zero incision fusion cage and a Uni-C insert fusion cage, both of which have the problem of high probability of damaging the vertebral endplate and vertebral collapse, and the screw locking type zero incision fusion cage also has the problem of interference between the upper nail angle and the lower jaw. SUMMARY

[0005] The utility model is just proposed based on the above-mentioned needs of the prior art, and the technical problem to be solved by the utility model is to provide a split type zero incision fusion system to avoid damage to the vertebral endplate and improve the stability of the fusion cage.

[0006] To solve the above problems, the utility model is implemented by adopting the following technical scheme:

[0007] A split type zero incision fusion system, the system comprises: a fusion cage comprising a main body and an anti-disengagement mechanism; the main body extends along a first direction and has a bone graft slot penetrating along a second direction, the second direction being perpendicular to the first direction; the anti-disengagement mechanism comprises two anti-disengagement pieces, the anti-disengagement pieces are detachably connected with the main body, the anti-disengagement pieces have elastic pieces, and the elastic pieces of the two anti-disengagement pieces are symmetrically distributed on both sides of the bone graft slot; a transmission mechanism comprising a first transmission part and a second transmission part, the first transmission part is detachably connected with the main body, the first transmission part is used to move the main body to a to-be-inserted position, the second transmission part is detachably connected with the anti-disengagement piece, and the second transmission part is used to move the anti-disengagement piece to a to-be-inserted position; the side of the transmission mechanism close to the vertebral body is provided with a limiting part, and the limiting part abuts against the anterior edge of the vertebral body to improve the stability of the transmission process of the transmission mechanism.

[0008] The detachable installation of the main body and the anti-extraction piece facilitates the taking out of the main body and the anti-extraction piece for maintenance and repair. Meanwhile, a special transmission mechanism is designed to place the fusion cage in the intervertebral space, avoiding the influence of the placement of the traditional anterior cervical plate on the adjacent segments in the traditional surgery, and reducing the contact area and space between the soft tissue in front of the vertebral body and the implant, preventing the damage to the vertebral endplate and the implant interference problem. The limiting part improves the stability of the transmission mechanism during the transmission process.

[0009] Optionally, the transmission mechanism comprises a chamber, which divides the interior into two spaces along a third direction, and at least partially accommodates the first transmission part and the second transmission part respectively, and the second transmission part is movable in the chamber along a first direction to change the length of the anti-extraction piece extending out of the chamber, and the third direction is perpendicular to the first direction and the second direction.

[0010] The cooperation of the chamber and the transmission mechanism changes the length of the anti-extraction piece extending out of the chamber, avoiding the scratching of the shrapnel with the tissue near the vertebral body during the movement to the insertion position.

[0011] Optionally, the main body comprises a recess, and the inner wall of the recess has a first thread; the anti-extraction piece has a first opening penetrating along the first direction; the fusion cage system further comprises a fastener, and the outer side of the fastener has a second thread, the fastener is inserted into the main body through the first opening, and the first thread and the second thread are connected; the transmission mechanism comprises a sleeve, and the sleeve has a first perforation and a second perforation penetrating along the first direction; the first transmission part comprises a first rod, and the second transmission part comprises a second rod; the first rod is adapted to pass through the first perforation, and the second rod is adapted to pass through the second perforation; the first rod is inserted into the chamber and passes through the interior space of the chamber, and the part exposed outside the chamber is connected with the main body; the second rod is inserted into the chamber and connected with the anti-extraction piece in the chamber.

[0012] The fastener fixes the main body and the anti-extraction piece, so that the main body and the anti-extraction piece do not move relatively, and the first transmission part and the second transmission part are set to transmit the main body and the anti-extraction piece relatively independently.

[0013] Optionally, the part of the first rod exposed outside the chamber is provided with a third thread; the third thread is adapted to the first thread; the fastener comprises a third groove provided on the head, and the inner wall of the third groove is provided with a thread adapted to the third thread.

[0014] In this way, the first rod transmits the fastener to the connection position of the anti-extraction piece and the main body, so as to fix the main body and the anti-extraction piece.

[0015] Optionally, the first distal end of the first rod away from the chamber has a plurality of circumferentially arranged protrusions; the second rod has a fourth groove at one end away from the chamber, the fourth groove runs through the first direction, and the fourth groove can at least partially accommodate the first distal end of the first rod.

[0016] With this arrangement, the first rod or the second rod can be moved independently of each other.

[0017] Optionally, the first transmission part includes a fixed block, which is arranged in the chamber and extends along the first direction. The fixed block passes through an accommodating space extending along the first direction, and the first rod is at least partially inserted into the accommodating space.

[0018] With this arrangement, an upward supporting force is provided to the first rod, so that the first rod moves smoothly.

[0019] Optionally, the fixed block has a first inclined surface, and the height of the first inclined surface in the second direction near the chamber opening is greater than the height inside the chamber; the second transmission part includes a moving part, and the moving part includes a first block and a second block, the first block is arranged on a side away from the chamber opening and is fixedly connected to the second rod; the second block is arranged on a side close to the chamber opening, one end of which is slidably connected to the first block, and the other end is connected to the anti-slip part; the second block has a third protrusion extending along the third direction, and the third protrusion abuts against the first inclined surface.

[0020] With this arrangement, when the first block moves along the first direction, it pushes the second block to move along the first inclined plane, so that the second block has a component moving along the second direction relative to the first block, driving the anti-slip component to move along the moving component in the first direction and the moving component in the second direction at the same time, so as to move the anti-slip component to the position to be connected to the main body and provide force for the anti-slip component to be inserted into the tissue near the vertebrae.

[0021] Optionally, the side of the second block close to the elastic sheet has a fourth inclined surface; the inner surface of the second plate close to the elastic sheet has a fifth inclined surface, and the fifth inclined surface is arranged at the chamber opening and parallel to the fourth inclined surface.

[0022] Since the fifth inclined surface is formed based on reducing the thickness of the chamber shell, the height inside the chamber increases from the inside to the outside, so that during the outward movement of the second block, the anti-slip part moves to the highest height of the chamber to provide space for the spring to move in the second direction.

[0023] Optionally, strip-shaped first protrusions are symmetrically provided on the left and right sides of the middle of the elastic sheet, and a gap is provided between the first protrusions and the elastic sheet to prevent the elastic sheet from moving in the opposite direction to the entry direction after being inserted.

[0024] When the shell is inserted into the vertebra, part of the tissue will extend into the gap between the first protruding part and the shell, and when a tendency of retreat is generated, it will generate great resistance to the retreat of the shell, so as to ensure the stability of the split zero-profile fusion cage and prevent dislocation.

[0025] Optionally, the inner wall of the first opening has a first retainer groove; the fastener is provided with a second protruding part, the second protruding part is matched with the first opening; the middle part of the second protruding part is provided with a second retainer groove, and the second retainer groove is sleeved with an elastic retainer; in the fixed state of the main body and the anti-disengagement piece, the retainer abuts against the first retainer groove.

[0026] In this way, the pressure applied to the fastener by the retainer prevents the fastener from exiting.

[0027] Compared with the prior art, the split zero-profile fusion cage system provided by the utility model has detachable installation of the main body and the anti-disengagement piece, which facilitates the taking out of the main body and the anti-disengagement piece for maintenance and repair. Meanwhile, a special transmission mechanism is designed to place the fusion cage in the intervertebral space, avoiding the influence of the placement of the traditional anterior cervical spine plate on adjacent segments in the traditional surgery, reducing the contact area and space between the soft tissue in front of the vertebral body and the built-in object, and preventing the damage to the vertebral endplate and the implant interference problem. In addition, the fusion cage is contained in the intervertebral space after decompression and does not protrude from the anterior edge of the vertebral body, so that the incidence and severity of postoperative dysphagia can be significantly reduced. In addition, the fusion cage of the utility model can be directly implanted through an endoscope, and the wound is relatively reduced compared with the traditional zero-profile fusion cage. BRIEF DESCRIPTION OF DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present specification or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or prior art description. Obviously, the drawings in the following description are only some embodiments described in the present specification, and other drawings can also be obtained by those skilled in the art according to these drawings.

[0029] Figure 1 is a perspective view of a fusion cage of a split zero-profile fusion cage system provided by the present embodiment;

[0030] Figure 2 is a sectional view of a fusion cage of a split zero-profile fusion cage system provided by the present embodiment;

[0031] Figure 3 is a perspective view of a transmission mechanism of a split zero-profile fusion cage system provided by the present embodiment;

[0032] Figure 4 is a first structural schematic view of a main body provided by the present embodiment;

[0033] Figure 5 is a second structural schematic view of the main body provided in the embodiment;

[0034] Figure 6 is a first structural schematic view of the fastener provided in the embodiment;

[0035] Figure 7 is a second structural schematic view of the fastener provided in the embodiment;

[0036] Figure 8 is a structural schematic view of the anti-disengagement piece provided in the embodiment;

[0037] Figure 9 is a partial structural schematic view of the transmission mechanism provided in the embodiment;

[0038] Figure 10 is an internal structural perspective view of the cartridge provided in the embodiment;

[0039] Figure 11 is a partial structural schematic view of the transmission mechanism when the anti-disengagement piece is located at the first limiting position provided in the embodiment;

[0040] Figure 12 is a partial structural schematic view of the transmission mechanism when the anti-disengagement piece is located at the second limiting position provided in the embodiment.

[0041] Reference signs:

[0042] 1-main body; 2-anti-disengagement piece; 3-bone implantation groove; 4-recess; 5-needle placement hole; 6-first guide wire hole; 7-fixing plate; 8-bursting piece; 9-first protrusion; 10-second guide wire hole; 11-first opening; 12-bent part; 13-first protruding part; 14-fastener; 15-head; 16-screw rod; 17-third recess; 18-second stop ring groove; 19-stop ring; 20-sleeve; 21-first rod; 22-second rod; 23-cartridge; 24-third thread; 25-fourth recess; 26-fixing block; 27-first inclined surface; 28-first block; 29-second block; 30-second inclined surface; 31-third inclined surface; 32-third protrusion; 33-fourth protruding part; 34-fourth inclined surface; 35-fifth inclined surface; 36-first limiting part; 37-second limiting part; 38-limiting plate. DETAILED DESCRIPTION

[0043] To make the purposes, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0044] In the description of the embodiments of the present application, it should be noted that unless explicitly specified and limited, the term "connected" should be understood in a broad sense, for example, it can be fixedly connected, or detachably connected, or integrally connected, which can be mechanically connected or electrically connected, which can be directly connected or indirectly connected through an intermediate medium. For a person of ordinary skill in the art, the specific meaning of the above-mentioned term in the present application can be understood according to the specific circumstances.

[0045] The terms "top", "bottom", "above", "under", and "on" used throughout the description are relative positions of components of the device, for example, the relative positions of the top and bottom substrates inside the device. It can be understood that the device is multifunctional, regardless of their orientation in space.

[0046] For the convenience of understanding the embodiments of the present application, further explanation and description will be made with specific embodiments in combination with the drawings, and the embodiments do not constitute a limitation on the present application.

[0047] The present embodiment provides a split zero-incision fusion system, as shown in Figures 1-12 , comprising:

[0048] The fusion device comprises a main body 1 and an anti-disengagement mechanism, and is used for being placed in an intervertebral space to fuse with adjacent vertebrae.

[0049] The main body 1 is annular in shape, extends along a first direction, and has a bone grafting groove 3 penetrating along a second direction, wherein the first direction is perpendicular to the second direction. The bone grafting groove 3 is filled with a filling material in the form of a crushed block or powder, and the filling material is a material for bone fusion. The main body 1 is placed in the intervertebral space to fuse with the upper and lower vertebrae, and in addition, the filling material can also be placed around the main body 1 to enhance the fusion degree of the main body 1 with the adjacent vertebrae.

[0050] The main body 1 is similar to the structure of a vertebral body, facilitating fusion with the vertebral body, and the surfaces on both sides of the second direction are provided with corrugated protrusions, the corrugated protrusions are multiple and uniformly distributed, and when implanted between the vertebrae, the friction can be increased to prevent the main body 1 from slipping off.

[0051] The main body 1 has a first end and a second end in the first direction, the second end is the end inserted between the vertebral bodies, and the first end is the distal end. The first end has two recesses 4, which are arranged on the first end face, and are spaced apart in the third direction, and are located at different heights in the second direction. The first end face is rectangular, and the two recesses 4 are located near the two opposite corners of the first end face. The first end of the recess 4 is recessed in the first direction, and the recess is not communicated with the bone graft groove to avoid affecting the fusion effect. The second end is provided with a needle hole 5, and a developing needle is arranged in the needle hole 5.

[0052] The recess 4 includes a first recess and a second recess, the first recess has a first space, and the cross section of the first space on the first end face is square in the embodiment. The second recess has a second space communicated with the first space, the cross-sectional area of the second space is smaller than that of the first space, and the inner wall of the second space has a first thread for fixing the main body 1. In addition, a first guide wire hole 6 is arranged beside the first recess, and the first guide wire hole 6 is used to guide the wire to pass through for surgical positioning.

[0053] The anti-extraction mechanism is detachably connected with the main body 1, and is partially inserted into the tissue near the adjacent vertebrae, so that the anti-extraction mechanism is located at the distal end of the main body 1, reduces the possibility of the opening in front of the vertebral body increasing when the cervical spine is hyperextended, and reduces the interference with the middle bone graft area of the main body 1, thereby increasing the area of the bone graft area. In addition, the anti-extraction mechanism enters the vertebral body part more, thereby increasing the stability of the fusion system.

[0054] The anti-extraction mechanism includes two anti-extraction pieces 2, which are at least partially arranged opposite to the two recesses 4 respectively.

[0055] The anti-extraction piece 2 has a fixed plate 7 and a spring piece 8 connected integrally, the fixed plate 7 covers part of the end face of the first end, the fixed plate 7 extends in the third direction and is divided into a first part and a second part, the first part has a gap in the second direction, and the second part has a first plate extending in the second direction, the first plate is provided with a first protrusion 9 near one side of the main body 1, and the first protrusion 9 is matched with the first space. The first plate is also provided with a second guide wire hole 10, when the anti-extraction mechanism is connected with the main body 1, the first guide wire hole 6 and the second guide wire hole 10 are arranged opposite to each other, and the guide wire passes through the second guide wire hole 10 and the first guide wire hole 6 in sequence to roughly determine the relative position relationship between the anti-extraction piece 2 and the main body 1. In addition, the fixed plate 7 has a first opening 11 penetrating in the first direction, the first opening 11 also penetrates the first protrusion 9, and the inner wall of the first opening 11 has a first stop ring 19 groove.

[0056] The elastic sheet 8 forms an angle of more than 90° with the fixed plate 7 in a natural state, and a bending portion 12 is formed at the connection between the fixed plate 7 and the elastic sheet 8 to form a smooth transition, and the inner wall of the bending portion 12 abuts against the main body 1 on one side in the second direction after being connected with the main body 1.

[0057] The end of the elastic sheet 8 away from the fixed plate 7 is a first free end, which is wedge-shaped to facilitate the elastic sheet 8 to be embedded in the tissue near the adjacent vertebrae after being placed in the intervertebral space. The middle of the first free end has a gap to release stress. The middle of the elastic sheet 8 is symmetrically provided with a strip-shaped first protruding portion 13 on the left and right sides. The end of the first protruding portion 13 away from the fixed plate 7 is connected with the middle of the elastic sheet 8, and the end close to the fixed plate 7 is a second free end. The first protruding portion 13 and the elastic sheet 8 have a gap therebetween to prevent the elastic sheet 8 from moving in the opposite direction after being placed. Specifically, when the elastic sheet 8 is inserted into the vertebrae, part of the tissue will extend into the gap between the first protruding portion 13 and the elastic sheet 8, and when there is a tendency to move in the backward direction, a great resistance will be generated to the backward movement of the elastic sheet 8 to ensure the stability of the split zero-profile interbody fusion cage and prevent dislocation.

[0058] When the anti-disengagement mechanism is fixedly connected with the main body 1, the two recesses 4 on the main body 1 are exemplarily a first recess and a second recess, and the two anti-disengagement members 2 corresponding thereto are a first anti-disengagement member and a second anti-disengagement member. The first recess is connected with the first anti-disengagement member, and the second recess is connected with the second anti-disengagement member. The first plate of the first anti-disengagement member is located in the area formed by the first portion and the second portion of the second anti-disengagement member, and correspondingly, the first plate of the second anti-disengagement member is located in the area formed by the first portion and the second portion of the first anti-disengagement member. Further, the fixed plates 7 abut against each other. The elastic sheets 8 of the two anti-disengagement members 2 are symmetrically distributed on the two sides of the main body 1 in the second direction.

[0059] The fusion cage system comprises a fastener 14 for fixing the fusion cage.

[0060] The fastener 14 comprises a head 15 and a screw rod 16. The head 15 is the end away from the main body 1, and the screw rod 16 is the end inserted into the main body 1. The cross-sectional area of the head 15 is larger than that of the screw rod 16, and the screw rod 16 has a second thread matched with the first thread. In the installation process, the fastener 14 is inserted into the main body 1 along the first direction through the first opening 11 of the anti-disengagement member 2, and is matched with the first thread of the second recess to realize the relative fixation of the main body 1 and the anti-disengagement member 2, and the side of the head 15 close to the screw rod 16 abuts against the fixed plate 7. The head 15 is further provided with a third recess 17 to facilitate the installation of the fastener 14.

[0061] The screw rod 16 is provided with a second protrusion on the side close to the head 15, which is matched with the first opening 11, and the inside of the second protrusion is provided with a second retaining ring groove 18, and the second retaining ring groove 18 is sleeved with a retaining ring 19, and the retaining ring 19 is elastic. During the installation of the fastener 14, the retaining ring 19 is extruded through the first opening 11, and the elasticity of the retaining ring 19 in the first retaining ring groove is released. The pressure applied to the fastener 14 by the retaining ring 19 prevents the fastener 14 from exiting, enhances the fastening force, and improves the bonding strength of the main body 1 and the anti-extraction piece 2.

[0062] The transmission mechanism can respectively move the main body 1 and the anti-extraction piece 2 to the position to be inserted.

[0063] The transmission mechanism comprises a sleeve 20, a first transmission part, a second transmission part and a chamber 23.

[0064] The sleeve 20 has a first through hole and a second through hole penetrating in the first direction, and the outside is provided with anti-skid lines to facilitate the operator to hold the outside of the sleeve 20 and move the transmission mechanism to the position to be inserted.

[0065] The first transmission part is detachably connected with the main body 1, and the first transmission part comprises a first rod 21 extending in the first direction and matched with the first through hole. The first rod 21 comprises a first insertion end and a first distal end. The first insertion end is inserted into the chamber 23 and penetrates through the internal space of the chamber 23, and the part exposed outside the chamber 23 is connected with the main body 1. The part of the first rod 21 exposed outside the chamber 23 is provided with a third thread 24 matched with the first thread of the main body 1 to connect the main body 1. In addition, the third thread 24 is matched with the thread on the inner wall of the third groove 17 of the fastener 14, so that the first rod 21 is connected with the fastener 14, thereby fixing the main body 1 and the anti-extraction piece 2. The first distal end is the end away from the chamber 23, and the end has a plurality of protrusions extending in the first direction arranged circumferentially, which facilitates the operator to rotate the first rod 21 axially, so that the first rod 21 is fixedly connected with the main body 1.

[0066] The second transmission part is detachably connected with the anti-extraction piece 2, and the second transmission part comprises a second rod 22 extending in the first direction and matched with the second through hole. The second rod 22 comprises a second insertion end and a second distal end. The second insertion end is inserted into the chamber 23 and connected with the anti-extraction piece 2 in the chamber 23. The second distal end is the end away from the chamber 23, and the end has a protruding fourth groove 25 penetrating through the first direction, and the opening is towards the first rod 21 to avoid the collision between the first rod 21 and the second rod 22.

[0067] The side of the chamber 23 is in communication with the outside world, specifically, the side of the chamber 23 away from the first insertion end and the second insertion end is open, and the chamber 23 includes a first plate, a second plate and a third plate, the first plate is located on the side of the sleeve 20 in the first direction, the first plate is provided with a second opening and a third opening, the second opening is for the first rod 21 to pass through, and the third opening is for the second rod 22 to pass through. Two second plates are oppositely arranged on both sides of the first plate in the second direction, and two third plates are oppositely arranged on both sides of the first plate in the third direction.

[0068] The chamber 23 divides the interior into two spaces along the third direction, which respectively at least partially accommodate the first transmission part and the second transmission part.

[0069] One of the spaces is mainly for providing a moving space for the transmission body 1, and the first transmission part includes a fixed block 26 which is fixedly arranged in the space of the chamber 23.

[0070] The fixed block 26 extends along the first direction and has an accommodation space extending along the first direction, the first rod 21 is at least partially inserted into the accommodation space, and the third thread 24 on the first insertion end is at least partially exposed outside the space formed by the chamber 23. The fixed block 26 maintains the strength of the combination of the first rod 21 and the body 1.

[0071] The overall shape of the fixed block 26 is trapezoidal, the fixed block 26 has oppositely arranged front and rear end faces in the first direction, the front end face is located away from the first plate, and the rear end face is located close to the first plate, the height of the front end face is higher than the height of the rear end face, forming a first inclined surface 27 which is inclined downward from the outside to the inside. The fixed block 26 is provided with a fourth opening extending along the first direction, the first insertion end of the first rod 21 passes through the fourth opening, and the inner wall of the fourth opening abuts against the outer wall of the first rod 21 to provide an upward supporting force to the first rod 21, so that the first rod 21 moves stably. In the process of connecting the first rod 21 and the body 1, the first insertion end of the first rod 21 sequentially passes through the first perforation of the sleeve 20, the second opening of the first plate and the fourth opening, and at least partially exposes the third thread 24 outside the chamber 23, so as to realize the connection with the body 1. In order to completely expose the third thread 24, the front end face is arranged at the opening of the chamber 23, so that the first rod 21 and the body 1 are combined as completely as possible.

[0072] The other space is mainly for providing a moving space for the transmission anti-dropping piece 2, and the second transmission part includes a moving part which is arranged in the other space of the chamber 23.

[0073] The moving part comprises a first block 28 and a second block 29. The first block 28 is arranged on the side close to the first plate and is fixedly connected with the second rod 22. The second block 29 is arranged on the side away from the first plate and is slidably connected with the first block 28 at the end away from the second rod 22. The first block 28 has a second inclined surface 30 at the end away from the second rod 22, which is inclined downward toward the opening of the cartridge 23. The second inclined surface 30 has a guide groove extending along the inclined direction of the second inclined surface 30. The side of the second block 29 close to the first block 28 has a third inclined surface 31 abutting against the second inclined surface 30. The third inclined surface 31 has a second protrusion matching the guide groove, and the second protrusion moves in the guide groove.

[0074] The other end of the second block 29 is connected with the anti-disengagement member 2. The second block 29 has a third protrusion 32 extending in the first direction, which matches the first opening 11 and is nested in the first opening 11 during the connection of the second block 29 and the anti-disengagement member 2.

[0075] The second block 29 has a third protrusion 33 extending in the third direction, which abuts against the first inclined surface 27. When the second rod 22 moves in the first direction, the first block 28 moves in the first direction and pushes the second block 29 to move along the first inclined surface 27, so that the second block 29 has a moving component in the second direction relative to the first block 28, and drives the anti-disengagement member 2 to move in the moving component in the first direction and the moving component in the second direction, so as to move the anti-disengagement member 2 to the position to be connected with the main body 1 and provide the force for the anti-disengagement member 2 to be inserted into the tissue near the vertebrae.

[0076] Further, the side of the second block 29 close to the spring 8 in the second direction has a fourth inclined surface 34. The inner surface of the second plate close to the spring 8 has a fifth inclined surface 35 arranged at the opening of the cartridge 23 and parallel to the fourth inclined surface 34. The spring 8 is at least partially accommodated in the space between the fourth inclined surface 34 and the first inclined surface 27. Since the fifth inclined surface 35 is formed based on the reduction of the thickness of the cartridge 23 shell, the height in the cartridge 23 increases from inside to outside, so that the anti-disengagement member 2 moves to the highest position of the cartridge 23 during the outward movement of the second block 29, to provide the moving space of the spring 8 in the second direction.

[0077] The inner space of the chamber 23 has a first limiting position and a second limiting position, the anti-disengaging piece 2 moves between the first limiting position and the second limiting position, in the first limiting position, the anti-disengaging piece 2 is accommodated into the chamber 23, the first block 28 abuts against the inner wall of the first plate; in the second limiting position, the spring piece 8 completely extends out of the chamber 23.

[0078] The transmission mechanism has a limiting part near one side of the vertebral body, the limiting part abuts against the anterior edge of the vertebral body to improve the stability of the transmission process of the transmission mechanism.

[0079] The limiting part includes a first limiting part 36 and a second limiting part 37.

[0080] The first limiting part 36 is arranged on the outer surface of the second plate near the spring piece 8, extends along a first direction, and is parallel to one end of the second plate near the opening of the chamber 23. When the transmission mechanism reaches the position to be inserted, the first limiting part 36 abuts against the anterior edge of the vertebral body. The anterior edge of the vertebral body is near the side of the fusion cage to be inserted.

[0081] The second limiting part 37 is arranged on the outer surface of the second plate away from the spring piece 8, extends along a second direction, is parallel to one end of the second plate near the opening of the chamber 23, and is diagonally arranged with the first limiting part 36 to improve the stability of the transmission mechanism abutting against the vertebral body.

[0082] The transmission mechanism further includes a limiting plate 38, the limiting plate 38 is protrudingly arranged on the side of the third plate away from the first plate, extends along the first direction, and is at the same height as the third thread 24 in the second direction. Since the length of the third thread 24 is adjustable, on the basis of arranging the limiting plate 38, the combined length of the third thread 24 is adjusted according to the length of the main body recess 4, thereby preventing the exposed part of the third thread 24 from being too short to reduce the bonding strength, and also preventing the exposed part of the third thread 24 from being too long to wear the main body 1.

[0083] Compared with the prior art, the embodiment provides a split zero-profile cage system, the main body 1 and the anti-disengaging piece 2 are detachably arranged, the main body 1 and the anti-disengaging piece 2 are convenient to take out for maintenance and repair. Meanwhile, a special transmission mechanism is designed to place the fusion cage in the intervertebral space, avoiding the influence of the placement of the traditional anterior cervical plate on the adjacent segments in the traditional surgery, and reducing the contact area and space between the soft tissue in front of the vertebral body and the implant. Meanwhile, the anti-disengaging piece 2 is placed at the angle of the vertebral body, preventing the damage to the vertebral endplate and the implant interference problem. In addition, the fusion cage is accommodated in the intervertebral space after decompression, and does not protrude from the anterior edge of the vertebral body, which can significantly reduce the incidence and severity of postoperative dysphagia. In addition, the fusion cage of the embodiment can be directly implanted through an endoscope, which reduces the incision compared with the traditional zero-profile cage.

[0084] The above detailed description of the specific implementation is further detailed for the purpose of the application, technical solutions and beneficial effects, and it should be understood that the above description is only for the specific implementation of the application and is not used to limit the protection scope of the application, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the application shall be included in the protection scope of the application.

Claims

1. A split zero-profile fusion system, comprising: The fusion device comprises a main body and an anti-extraction mechanism. The main body extends along a first direction and has a bone grafting groove extending along a second direction perpendicular to the first direction. The anti-extraction mechanism comprises two anti-extraction pieces, which are detachably connected to the main body and have elastic pieces symmetrically distributed on both sides of the bone grafting groove. The transmission mechanism comprises a first transmission part and a second transmission part, the first transmission part is detachably connected to the main body and is used to move the main body to a position to be inserted, and the second transmission part is detachably connected to the anti-extraction piece and is used to move the anti-extraction piece to a position corresponding to the position to be inserted; the transmission mechanism is provided with a limiting part on the side close to the vertebral body, which abuts against the anterior edge of the vertebral body to improve the stability of the transmission mechanism during transmission. The transmission mechanism comprises a chamber, which divides the interior into two spaces along a third direction to at least partially accommodate the first transmission part and the second transmission part, respectively; the second transmission part can move along the first direction in the chamber to change the length of the anti-extraction piece extending out of the chamber; the third direction is perpendicular to the first direction and the second direction.

2. A split zero-profile fusion cage system according to claim 1, characterized in that:

3. The split zero-trace fusion device system of claim 2, wherein the main body comprises a recess, and the inner wall of the recess is provided with a first thread; the anti-extraction piece is provided with a first hole extending along the first direction; the fusion device system further comprises a fastener, which is provided with a second thread on the outer side, is inserted into the main body through the first hole, and is connected by the first thread and the second thread; the transmission mechanism comprises a sleeve, which is provided with a first perforation and a second perforation extending along the first direction; the first transmission part comprises a first rod, and the second transmission part comprises a second rod; the first rod is adapted to pass through the first perforation, and the second rod is adapted to pass through the second perforation; the first rod is inserted into the chamber and passes through the interior space of the chamber, and the part exposed outside the chamber is connected to the main body; the second rod is inserted into the chamber and connected to the anti-extraction piece in the chamber.

4. The split zero-trace fusion device system of claim 3, wherein the part of the first rod exposed outside the chamber is provided with a third thread; the third thread is adapted to the first thread; the fastener comprises a third groove provided on the head, and the inner wall of the third groove is provided with a thread adapted to the third thread.

5. The split zero-trace fusion device system of claim 3, wherein the first distal end of the first rod away from the chamber is provided with a plurality of protrusions arranged in a circumferential direction; one end of the second rod away from the chamber is provided with a fourth groove extending along the first direction, and the fourth groove can at least partially accommodate the first distal end of the first rod.

6. The split zero-trace fusion device system of claim 3, wherein ​ The first transmission part includes a fixed block, the fixed block is arranged in the chamber and extends along the first direction, the fixed block is penetrated by an accommodation space extending along the first direction, and the first rod is at least partially inserted into the accommodation space.

7. The split zero-profile fusion system of claim 6, wherein, The fixed block has a first inclined surface, a height of the first inclined surface near the chamber opening in the second direction is greater than a height of the first inclined surface inside the chamber; The second transmission part includes a moving part, the moving part includes a first block and a second block, the first block is arranged on a side away from the chamber opening and is fixedly connected with the second rod, and the second block is arranged on a side close to the chamber opening, one end of the second block is slidably connected with the first block, and the other end of the second block is connected with the anti-disengagement piece; The second block has a third protruding part extending along a third direction, and the third protruding part abuts against the first inclined surface.

8. The split zero-profile fusion system of claim 7, wherein, The second block has a fourth inclined surface on a side close to the spring; An inner surface of the second plate close to the spring has a fifth inclined surface, the fifth inclined surface is arranged at the chamber opening and is arranged in parallel with the fourth inclined surface.

9. The split zero-profile fusion system of claim 1, wherein, The spring has a strip-shaped first protruding part symmetrically arranged on the left and right sides of the middle part of the spring, and a gap is formed between the first protruding part and the spring to prevent the spring from moving in a direction opposite to the insertion direction after being inserted.

10. The split zero-profile fusion system of claim 3, wherein, An inner wall of the first opening has a first retainer groove; The fastener is provided with a second protruding part, the second protruding part is matched with the first opening, a second retainer groove is arranged in the middle part of the second protruding part, an elastic retainer is sleeved in the second retainer groove, and the retainer abuts against the first retainer groove in a state that the main body and the anti-disengagement piece are fixed.

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