Split type zero-incisura fusion cage system and use method

Abstract

The invention discloses a split type zero-incisura fusion cage system and a use method, and the system comprises a fusion cage which comprises a main body and a fixing part; the body extends in the first direction and is used for being arranged in an intervertebral space to be fused with adjacent vertebrae. The fixing part comprises two fixing pieces, the fixing pieces are detachably connected with the main body, the fixing pieces are provided with elastic pieces, and the elastic pieces of the two fixing pieces are symmetrically distributed on the two sides of the main body in the second direction; the conveying mechanism can move the main body to a to-be-inserted position, the conveying mechanism comprises a first conveying part and a second conveying part, the first conveying part is detachably connected with the main body, and the second conveying part is detachably connected with the fixing piece; the conveying mechanism comprises a bin, the interior of the bin is divided into two spaces in the third direction, the two spaces at least partially contain the first conveying part and the second conveying part respectively, and the second conveying part can move in the bin in the first direction so as to change the length, stretching out of the bin, of the fixing part. The vertebral body end plate is prevented from being damaged, and the stability of the fusion cage is improved.

Description

Technical Field

[0001] The present invention relates to the field of medical devices, and more particularly to a split zero-profile fusion device system and a method of using the same. Background Art

[0002] Anterior cervical discectomy and vertebral fusion is currently the most commonly used method for the treatment of cervical spondylosis. This procedure can effectively reconstruct the intervertebral space and intervertebral foramen height, has the advantages of sufficient decompression, firm fixation, minimal trauma, and restoration of the physiological curvature of the cervical spine. It is considered the "gold standard" for the treatment of cervical spondylosis.

[0003] Since the anterior cervical titanium plate has a certain thickness, while the bone graft fusion rate is improved, postoperative complications are also difficult to avoid. In recent years, with the continuous improvement of manufacturing technology, the notch of the anterior cervical titanium plate has been significantly reduced compared with before. Despite this, clinical observations show that postoperative patients still experience pharyngeal discomfort or even difficulty swallowing, degeneration of the vertebral body adjacent to the fusion segment, and even internal fixation slippage and breakage. In order to solve the above problems, the existing technology combines the anterior cervical titanium plate with a fusion device to obtain a zero-notch fusion device.

[0004] However, the zero-profile fusion devices in the prior art are mainly traditional screw-locked zero-profile fusion devices and Uni-C insert fusion devices, both of which have the problem of high probability of damaging the vertebral endplate and vertebral collapse, and the screw-locked zero-profile fusion device also has problems such as interference between the upper screw angle and the mandible. Summary of the invention

[0005] The present invention is proposed based on the above-mentioned requirements of the prior art. The technical problem to be solved by the present invention is to provide a split zero-profile fusion cage system and a use method to avoid damage to the vertebral endplate and improve the stability of the fusion cage.

[0006] In order to solve the above problems, the present invention is implemented by adopting the following technical solutions:

[0007] A split zero-profile fusion system, the system comprising: a fusion device, comprising a main body and a fixing part; the main body extends along a first direction and is used to be placed in an intervertebral space and fuse with adjacent vertebrae; the fixing part comprises two fixing members, the fixing members are detachably connected to the main body, the fixing members have spring plates, the spring plates of the two fixing members are symmetrically distributed on both sides of the main body along a second direction, and the second direction is perpendicular to the first direction; a conveying mechanism, capable of moving the main body to a position to be inserted, the conveying mechanism comprising a first conveying part and a second conveying part, the first conveying part is detachably connected to the main body, and the second conveying part is detachably connected to the fixing member; the conveying mechanism comprises a chamber, the chamber divides the interior into two spaces along a third direction, respectively accommodating the first conveying part and the second conveying part, the second conveying part can move in the chamber along the first direction to change the length of the fixing member extending out of the chamber, and the third direction is perpendicular to the first direction and the second direction.

[0008] The main body and the fixing parts can be detachably installed, which is convenient for taking out the main body and the fixing parts for maintenance and repair. At the same time, a special transmission mechanism is designed to place the fusion device in the intervertebral space, avoiding the impact of the placement of the anterior cervical plate on the adjacent segments in traditional surgery, and reducing the contact surface and space between the soft tissue in front of the vertebral body and the implant, preventing damage to the vertebral end plate and implant interference problems.

[0009] Optionally, the main body includes a recess, the inner wall of the recess has a first thread; the fixing member has a first opening extending through the fixing member in a first direction; the fusion system also includes a fastener, the outer side of the fastener has a second thread, the fastener is inserted into the main body through the first opening, and is connected to the second thread through the first thread.

[0010] The main body and the fixing piece are fixed by the fastener so that the main body and the fixing piece will not move relative to each other.

[0011] Optionally, the conveying mechanism includes a sleeve having a first through-hole and a second through-hole extending along a first direction; the first conveying part includes a first rod, and the second conveying part includes a second rod; the first rod is adapted to the first through-hole to pass through the first through-hole, and the second rod is adapted to the second through-hole to pass through the second through-hole; the first rod is inserted into the chamber and passes through the internal 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 fixing member in the chamber.

[0012] By providing the first conveying part and the second conveying part, the main body and the fixing piece are conveyed relatively independently.

[0013] Optionally, a third thread is provided on the outer portion of the first rod exposed outside the chamber; the third thread is matched with the first thread; the fastener includes a third groove provided on the head, and a thread matched with the third thread is provided on the inner wall of the third groove.

[0014] With this arrangement, the first rod transmits the fastener to the connection position between the fixing member and the main body, thereby fixing the main body and the fixing member.

[0015] Optionally, the first end of the first rod away from the chamber has a plurality of circumferentially arranged protrusions; the end of the second rod away from the chamber has a fourth groove, the fourth groove runs through the first direction, and the fourth groove can at least partially accommodate the first 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 conveying 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 conveying part includes a moving part, and the moving part includes a first block and a second block, the first block is arranged on the side away from the chamber opening and fixedly connected to the second rod; the second block is arranged on the 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 fixing member; 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 fixing member to move along the moving components in the first direction and the second direction at the same time, so as to move the fixing member to a position to be connected to the main body and provide force for the fixing member to be inserted into the tissue near the vertebrae.

[0021] Optionally, a side of the second block close to the spring sheet has a fourth inclined surface; an inner surface of the second plate close to the spring 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 fixing member moves to the highest height of the chamber to provide movement space for the spring piece in the second direction.

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

[0024] When the shrapnel is inserted into the vertebra, part of the tissue will extend into the gap between the first protrusion and the shrapnel. When there is a tendency to withdraw, it will produce huge resistance to the withdrawal of the shrapnel to ensure the stability of the split zero-profile fusion device and prevent dislocation.

[0025] Optionally, the inner wall of the first opening has a first retaining ring groove; the fastener is provided with a second protrusion, and the second protrusion is adapted to the first opening; a second retaining ring groove is provided in the middle of the second protrusion, and an elastic retaining ring is sleeved in the second retaining ring groove; when the main body and the fixing piece are fixed, the retaining ring abuts against the first retaining ring groove.

[0026] With this arrangement, the pressure applied to the fastener by the retaining ring prevents the fastener from backing out.

[0027] A method for using a split zero-profile fusion device system is provided. Using any of the split zero-profile fusion device systems described above, the method comprises: step one: connecting a first transmission part to a main body, and connecting a second transmission part to one of two fixing parts; moving the second transmission part to store the fixing part connected thereto in the chamber; step two: moving the transmission mechanism to move the main body connected thereto to a position to be inserted into the patient's body; step three: separating the first transmission part from the main body connected thereto; step four: adjusting the position of the transmission mechanism according to the corresponding position of the position to be inserted, pushing the second transmission part so that the connected fixing part extends out of the chamber, and embedding the spring sheet into the tissue near the adjacent vertebrae at the position to be inserted, so that the fixing part corresponds to the adaptation structure of the main body; step five: separating the second transmission part from the fixing part connected thereto, and connecting the main body to the fixing part; step six: connecting the second transmission part to another fixing part, and repeating steps four and five to complete the installation of the fusion device.

[0028] Compared with the prior art, the present invention provides a split zero-profile fusion device system and a method of use. The main body and the fixings are detachably installed, which facilitates the removal of the main body and the fixings for maintenance and repair. At the same time, a special transmission mechanism is designed to place the fusion device in the intervertebral space, avoiding the impact of the placement of anterior cervical plates on adjacent segments in traditional surgery, and reducing the contact surface and space between the soft tissue in front of the vertebral body and the built-in objects. At the same time, the fixings are inserted from the vertebral angle to prevent damage to the vertebral endplate and implant interference problems. In addition, the fusion device is accommodated in the gap after decompression and will not protrude from the front edge of the vertebral body, which can significantly reduce the incidence and severity of postoperative dysphagia. In addition, the fusion device of the present invention can be directly implanted through an endoscope, which reduces the wound compared to the traditional zero-profile fusion device. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of this specification or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the embodiments of this specification. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0030] Figure 1 This is a stereoscopic diagram of a fusion device of a split zero-profile fusion device system provided in this embodiment;

[0031] Figure 2 is a cross-sectional view of a fusion device of a split zero-profile fusion device system provided in this embodiment;

[0032] Figure 3 It is a stereoscopic diagram of a transmission mechanism of a split zero-profile fusion device system provided in this embodiment;

[0033] Figure 4 is a first structural schematic diagram of the main body provided by this embodiment;

[0034] Figure 5 is a second structural schematic diagram of the main body provided by this embodiment;

[0035] Figure 6 is a first structural schematic diagram of the fastener provided in this embodiment;

[0036] Figure 7 is a second structural schematic diagram of the fastener provided in this embodiment;

[0037] Figure 8 is a schematic diagram of the structure of the fixing member provided in this embodiment;

[0038] Fig. 9 is a partial structural schematic diagram of the transmission mechanism provided in this embodiment;

[0039] Fig.10 is a perspective view of the internal structure of the chamber provided in this embodiment;

[0040] Fig.11 is a partial structural schematic diagram of the transmission mechanism provided by this embodiment when the fixing member is located at the first limit position;

[0041] Fig.12 It is a partial structural schematic diagram of the transmission mechanism provided by this embodiment when the fixing member is located at the second limit position.

[0042] Reference numerals:

[0043] 1-main body; 2-fixing piece; 3-bone grafting chamber; 4-recess; 5-needle hole; 6-first guide wire hole; 7-fixing plate; 8-spring; 9-first convex block; 10-second guide wire hole; 11-first opening; 12-bending portion; 13-first protrusion; 14-fastener; 15-head; 16-screw; 17-third groove; 18-second retaining ring groove; 19-retaining ring; 20-sleeve; 21-first rod; 22-second rod; 23-chamber; 24-third thread; 25-fourth groove; 26-fixing block; 27-first inclined plane; 28-first block; 29-second block; 30-second inclined plane; 31-third inclined plane; 32-third convex block; 33-third protrusion; 34-fourth inclined plane; 35-fifth inclined plane; 36-first limiting part; 37-second limiting part; 38-third limiting part. DETAILED DESCRIPTION

[0044] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0045] It should be noted that, unless otherwise clearly specified and limited, the term "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection, a mechanical connection, an electrical connection, a direct connection, or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0046] The terms "top", "bottom", "above", "lower", and "on" etc. used in the description throughout the text are relative to the relative positions of components of a device, such as the relative positions of the top and bottom substrates within a device. It is understood that devices are multifunctional regardless of their orientation in space.

[0047] To facilitate understanding of the embodiments of the present invention, further explanation will be given below with reference to specific embodiments in conjunction with the accompanying drawings. The embodiments do not constitute a limitation on the protection scope of the present invention.

[0048] This embodiment provides a split zero-profile fusion device system, such as Figure 1-Figure 12 As shown, including:

[0049] The fusion cage comprises a main body 1 and a fixing part, and is used for being placed in the intervertebral space to fuse with adjacent vertebrae.

[0050] The main body 1 is annular in shape, extending in a first direction, and has a bone grafting chamber 3 extending in a second direction, wherein the first direction is perpendicular to the second direction. The bone grafting chamber 3 is filled with a filler in the form of broken pieces or powder, and the filler is a material for bone fusion. The main body 1 is placed in the intervertebral space and fused with the upper and lower vertebrae. In addition, fillers can also be placed around the main body 1 to enhance the degree of fusion between the main body 1 and the adjacent vertebrae.

[0051] The main body 1 is similar to the vertebral structure, which is convenient for fusion with the vertebral body, and the surfaces on both sides of the second direction are provided with rib-like protrusions, which are multiple and evenly distributed. When implanted between vertebrae, the friction force can be increased to prevent the main body 1 from slipping.

[0052] The main body 1 has a first end and a second end in the first direction, the second end is an end inserted between the vertebral bodies, and the first end is an end away. The first end has two recesses 4, and the two recesses 4 are arranged on the first end face. The two recesses 4 have a certain interval in the third direction and are located at different heights in the second direction. The third direction is perpendicular to the first direction and the second direction. Exemplarily, the first end face is rectangular, and the two recesses 4 are respectively located in the areas close to the two opposite corners of the first end face. The first end of the recess 4 is recessed along the first direction, and the recess is not connected to the bone grafting groove to avoid affecting the fusion effect. The second end is provided with a pin hole 5, and a developing needle is installed in the pin hole 5.

[0053] The recess 4 includes a first groove and a second groove, the first groove has a first space, and in this embodiment, the cross section of the first space on the first end surface is square. The second groove has a second space connected to the first space, the cross-sectional area of ​​the second space is smaller than the cross-sectional area of ​​the first space, and the inner wall of the second space has a first thread for fixing the body 1. In addition, a first guide wire hole 6 is provided next to the first groove, and the first guide wire hole 6 is used to guide the wire through for surgical positioning.

[0054] The fixing part is detachably connected to the main body 1 and partially inserted into the tissue near the adjacent vertebrae, so that the fixing part is located at the distal end of the main body 1, which reduces the possibility of the opening in front of the vertebral body increasing when the cervical spine is bent backward, and at the same time reduces the interference with the bone grafting area in the middle of the main body 1, and increases the area of ​​the bone grafting area. In addition, the fixing part enters more of the vertebral body, which increases the stability of the fusion system.

[0055] The fixing portion includes two fixing members 2 , and the two fixing members 2 are at least partially disposed opposite to the two recesses 4 , respectively.

[0056] The fixing member 2 has an integrally connected fixing plate 7 and a spring sheet 8, the fixing plate 7 covers part of the end surface of the first end, the fixing plate 7 extends along the third direction and is divided into a first part and a second part, the first part has a notch along the second direction, the second part has a first plate extending in the second direction, a first protrusion 9 is provided on the side of the first plate close to the main body 1, and the first protrusion 9 is adapted to the first space. A second wire guide hole 10 is also provided on the first plate, when the fixing part is connected to the main body 1, the first wire guide hole 6 is arranged opposite to the second wire guide hole 10, and the guide wire passes through the second wire guide hole 10 and the first wire guide hole 6 in sequence to roughly determine the relative position relationship between the fixing member 2 and the main body 1. In addition, the fixing plate 7 has a first opening 11 penetrating along the first direction, the first opening 11 also passes through the first protrusion 9, and the inner wall of the first opening 11 has a first retaining ring 19 groove.

[0057] In a natural state, the spring sheet 8 forms an angle of more than 90° with the fixing plate 7, and a smoothly transitioned bending portion 12 is formed at the connection between the fixing plate 7 and the spring sheet 8. After being connected to the main body 1, the inner wall of the bending portion 12 abuts against one side of the main body 1 in the second direction.

[0058] The end of the spring sheet 8 away from the fixing plate 7 is the first free end, and the first free end is wedge-shaped, so that the spring sheet 8 can be inserted into the intervertebral space and embedded in the tissue near the adjacent vertebrae. There is a gap in the middle of the first free end to release stress. The middle of the spring sheet 8 is symmetrically provided with strip-shaped first protrusions 13 on both sides. The end of the first protrusion 13 away from the fixing plate 7 is connected to the middle of the spring sheet 8, and the end close to the fixing plate 7 is the second free end. There is a gap between the first protrusion 13 and the spring sheet 8 to prevent the spring sheet 8 from moving in the opposite direction after insertion. Specifically, when the spring sheet 8 is inserted into the vertebra, part of the tissue will extend into the gap between the first protrusion 13 and the spring sheet 8. When a tendency to withdraw in the direction of withdrawal is generated, a huge resistance will be generated to the withdrawal of the spring sheet 8, so as to ensure the stability of the split zero-profile fusion device and prevent dislocation.

[0059] When the fixing part is fixedly connected to the main body 1, illustratively, the two recesses 4 on the main body 1 are respectively the first recess and the second recess, and the two corresponding fixing members 2 are respectively the first fixing member and the second fixing member, the first recess is connected to the first fixing member, the second recess is connected to the second fixing member, the first plate of the first fixing member is located in the area formed by the first part and the second part of the second fixing member, and correspondingly, the first plate of the second fixing member is located in the area formed by the first part and the second part of the first fixing member. Further, the fixing plates 7 abut against each other. The spring pieces 8 of the two fixing members 2 are symmetrically distributed on both sides of the main body 1 along the second direction.

[0060] The fusion cage system includes a fastener 14, and the fastener 14 is used to fix the fusion cage.

[0061] The fastener 14 includes a head 15 and a screw 16, wherein the head 15 is an end away from the main body 1, and the screw 16 is an end inserted into the main body 1. The cross-sectional area of ​​the head 15 is larger than the cross-sectional area of ​​the screw 16, and the screw 16 has a second thread matched with the first thread. During the installation process, the fastener 14 is inserted into the main body 1 through the first opening 11 of the fixing member 2 along the first direction, and cooperates with the first thread of the second groove to achieve relative fixation of the main body 1 and the fixing member 2, and the side of the head 15 close to the screw 16 abuts against the fixing plate 7. The head 15 is also provided with a third groove 17 to facilitate the installation of the fastener 14.

[0062] The screw rod 16 is provided with a second protrusion on one side close to the head 15, and the second protrusion is adapted to the first opening 11. A second retaining ring groove 18 is provided inside the second protrusion, and a retaining ring 19 is sleeved in the second retaining ring groove 18. The retaining ring 19 is elastic. During the installation of the fastener 14, after the retaining ring 19 is squeezed through the first opening 11, the elasticity of the retaining ring 19 in the first retaining ring groove is released, and the pressure applied to the fastener 14 by the retaining ring 19 prevents the fastener 14 from withdrawing, thereby enhancing the fastening force and improving the bonding strength between the main body 1 and the fixing member 2.

[0063] The conveying mechanism can respectively move the main body 1 and the fixing member 2 to the positions to be inserted.

[0064] The conveying mechanism includes a sleeve 20 , a first conveying portion, a second conveying portion and a chamber 23 .

[0065] The sleeve 20 has a first through hole and a second through hole extending along a first direction, and an anti-slip pattern is provided on the outer side thereof so that the operator can hold the outer side of the sleeve 20 and move the transmission mechanism to the position to be inserted.

[0066] The first transmission part is detachably connected to the main body 1, and the first transmission part includes a first rod 21, which extends along the first direction and is adapted to the first through hole. The first rod 21 includes a first insertion end and a first distal end. The first insertion end is inserted into the chamber 23 and passes through the internal space of the chamber 23, and the portion exposed outside the chamber 23 is connected to the main body 1. The portion of the first rod 21 exposed outside the chamber 23 is provided with a third thread 24, and the third thread 24 is adapted to the first thread of the main body 1 to connect the main body 1. In addition, the third thread 24 is adapted to the thread of the inner wall of the third groove 17 of the fastener 14, so that the first rod 21 is connected to the fastener 14, thereby fixing the main body 1 and the fixing member 2. The first distal end is an end away from the chamber 23, and the end has a plurality of protrusions extending along the first direction arranged circumferentially, so that the operator can axially rotate the first rod 21 to fix the first rod 21 to the main body 1.

[0067] The second transmission part is detachably connected to the fixing member 2, and the second transmission part includes a second rod 22, the second rod 22 extends along the first direction and is adapted to the second through hole, the second rod 22 includes a second insertion end and a second remote end, the second insertion end is inserted into the chamber 23, and is connected to the fixing member 2 in the chamber 23. The second remote end is an end away from the chamber 23, and has a protruding fourth groove 25 at its end, the fourth groove 25 runs through the first direction, and the opening faces the first rod 21 to prevent the first rod 21 and the second rod 22 from colliding with each other.

[0068] One side of the chamber 23 is in communication with the outside, specifically, the side of the chamber 23 away from the first insertion end and the second insertion end is open, and illustratively, the chamber 23 includes a first plate, a second plate, and a third plate, the first plate is located on the side close to the sleeve 20 in the first direction, and 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. The two second plates are relatively arranged on both sides of the first plate in the second direction, and the two third plates are relatively arranged on both sides of the first plate in the third direction.

[0069] The chamber 23 is divided into two spaces along the third direction, respectively accommodating the first conveying part and the second conveying part at least partially.

[0070] One of the spaces is mainly used to provide a moving space for the conveying body 1 . Exemplarily, the first conveying part includes a fixed block 26 , and the fixed block 26 is fixedly arranged in the space of the chamber 23 .

[0071] The fixing block 26 extends in the first direction and penetrates a receiving space extending in the first direction, the first rod 21 is at least partially inserted into the receiving 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 fixing block 26 maintains the strength of the first rod 21 combined with the main body 1.

[0072] The fixing block 26 is in the form of a trapezoid. The fixing block 26 has a front face and a rear face that are arranged opposite to each other in the first direction. The front face is located on the side away from the first plate, and the rear face is located on the side close to the first plate. The height of the front face is higher than the height of the rear face, forming a first inclined surface 27 that slopes downward from the outside to the inside. The fixing block 26 is provided with a fourth opening, which extends along the first direction. The first insertion end of the first rod 21 passes through the fourth opening. The inner wall of the fourth opening abuts against the outer wall of the first rod 21, providing an upward support force to the first rod 21, so that the first rod 21 moves smoothly. In the process of connecting the first rod 21 with the main body 1, the first insertion end of the first rod 21 passes through the first through hole of the sleeve 20, the second opening of the first plate, and the fourth opening in sequence, at least partially exposing the third thread 24 outside the chamber 23, thereby achieving connection with the main body 1. In order to expose the third thread 24 completely, the front face is provided at the opening of the chamber 23, so that the first rod 21 can be combined with the main body 1 as completely as possible.

[0073] The other space is mainly used to provide a movable space for the conveying fixture 2 . Exemplarily, the second conveying part includes a moving part, and the moving part is arranged in the other space of the chamber 23 .

[0074] The moving part includes a first block 28 and a second block 29. The first block 28 is arranged on a side close to the first plate and fixedly connected to the second rod 22. The second block 29 is arranged on a side away from the first plate, and one end of the second block 29 is slidably connected to an end of the first block 28 away from the second rod 22. Exemplarily, the first block 28 has a second inclined surface 30, which is located at an end away from the second rod 22 and is inclined downward toward the direction of the opening of the chamber 23. The second inclined surface 30 has a guide groove, and the guide groove extends along the inclination direction of the second inclined surface 30. The second block 29 has a third inclined surface 31 on a side close to the first block 28 that abuts against the second inclined surface 30, and the third inclined surface 31 has a second protrusion adapted to the guide groove, and the second protrusion moves in the guide groove.

[0075] The other end of the second block 29 is connected to the fixing member 2. Exemplarily, the second block 29 has a third protrusion 32 extending along the first direction. The third protrusion 32 is adapted to the first opening 11. During the process of connecting the second block 29 and the fixing member 2, the third protrusion 32 is nested in the first opening 11.

[0076] The second block 29 has a third protrusion 33 extending along the third direction, and the third protrusion 33 abuts against the first inclined surface 27. When the second rod 22 moves along the first direction, the first block 28 moves along the first direction, pushing the second block 29 to move along the first inclined surface 27, so that the second block 29 has a component moving along the second direction relative to the first block 28, driving the fixing member 2 to move along the moving components in the first direction and the moving components in the second direction at the same time, so as to move the fixing member 2 to a position to be connected with the main body 1, and provide a force for the fixing member 2 to be inserted into the tissue near the vertebra.

[0077] Furthermore, the second block 29 has a fourth inclined surface 34 on one side close to the elastic sheet 8 in the second direction. The inner surface of the second plate close to the elastic sheet 8 has a fifth inclined surface 35, which is arranged at the opening of the chamber 23 and is arranged parallel to the fourth inclined surface 34. The elastic sheet 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 reducing the thickness of the housing of the chamber 23, the height inside the chamber 23 increases from the inside to the outside, so that during the outward movement of the second block 29, the fixing member 2 moves to the highest height of the chamber 23 to provide a moving space for the elastic sheet 8 in the second direction.

[0078] The internal space of the chamber 23 has a first limit position and a second limit position, and the fixing member 2 moves between the first limit position and the second limit position. When in the first limit position, the fixing member 2 is accommodated in the chamber 23, and the first block 28 abuts against the inner wall of the first plate; when in the second limit position, the spring piece 8 is completely extended out of the chamber 23.

[0079] The conveying mechanism has a limiting portion on one side close to the vertebral body, and the limiting portion abuts against the front edge of the vertebral body to improve the stability of the conveying mechanism during the conveying process.

[0080] The limiting portion includes a first limiting portion 36 , a second limiting portion 37 and a third limiting portion 38 .

[0081] The first stopper 36 is arranged on the outer surface of the second plate near the spring sheet 8, extends along the first direction, and is flush with the end of the second plate near the opening of the chamber 23. When the conveying mechanism reaches the insertion position, the first stopper 36 abuts against the front edge of the vertebral body. The front edge of the vertebral body is the side close to the fusion device when the fusion device is to be inserted.

[0082] The second limiting portion 37 is arranged on the outer surface of the second plate away from the spring sheet 8, extends along the second direction, is flush with the end of the second plate close to the opening of the chamber 23, and is arranged diagonally with the first limiting portion 36 to improve the stability of the transmission mechanism against the vertebral body.

[0083] The third limiting portion 38 is protrudingly disposed on the side of the third plate away from the first plate, extending along the first direction, and located 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 setting the third limiting portion 38, the engaging length of the third thread 24 is adjusted according to the length of the main body recess 4, thereby preventing the exposed portion of the third thread 24 from being too short to reduce the engaging strength, and also preventing the exposed portion of the third thread 24 from being too long to wear the main body 1.

[0084] In another embodiment, a method for using a split zero-profile fusion device system is provided, and the method for using the split zero-profile fusion device system includes: step 1: connecting the first transmission part to the main body, and the second transmission part to one of the two fixing parts; moving the second transmission part to store the fixing part connected thereto into the chamber. Step 2: moving the transmission mechanism to move the main body connected thereto to the position to be inserted into the patient's body; step 3: separating the first transmission part from the main body connected thereto; step 4: adjusting the position of the transmission mechanism according to the corresponding position of the position to be inserted, pushing the second transmission part, so that the connected fixing part extends out of the chamber, and embedding the spring piece into the tissue near the adjacent vertebrae of the position to be inserted, so that the fixing part corresponds to the adaptation structure of the main body; step 5: separating the second transmission part from the fixing part connected thereto, and connecting the main body to the fixing part; step 6: connecting the second transmission part to another fixing part, and repeating steps 4 and 5 to complete the installation of the fusion device.

[0085] Compared with the prior art, this embodiment provides a split zero-profile fusion device system and a method of use. The main body and the fixings are detachably installed, which facilitates the removal of the main body and the fixings for maintenance and repair. At the same time, a special transmission mechanism is designed to place the fusion device in the intervertebral space, avoiding the impact of the placement of anterior cervical plates on adjacent segments in traditional surgery, and reducing the contact surface and space between the soft tissue in front of the vertebral body and the built-in objects. At the same time, the fixings are inserted from the vertebral angle to prevent damage to the vertebral endplate and implant interference problems. In addition, the fusion device is accommodated in the gap after decompression and will not protrude from the front edge of the vertebral body, which can significantly reduce the incidence and severity of postoperative dysphagia. In addition, the fusion device of this embodiment can be directly implanted through an endoscope, which reduces the wound compared to the traditional zero-profile fusion device.

[0086] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A split zero-profile fusion system, characterized in that: include: A fusion device, comprising a main body and a fixing part; The body extends along a first direction and is used to be placed in the intervertebral space and fused with adjacent vertebrae; The fixing part includes two fixing members, which are detachably connected to the main body, and the fixing members have spring plates, and the spring plates of the two fixing members are symmetrically distributed on both sides of the main body along a second direction, and the second direction is perpendicular to the first direction; A conveying mechanism capable of moving the main body to a position to be inserted, respectively, the conveying mechanism comprising a first conveying part and a second conveying part, the first conveying part being detachably connected to the main body, and the second conveying part being detachably connected to a fixing member; the conveying mechanism comprising a chamber, the chamber dividing the interior into two spaces along a third direction, respectively at least partially accommodating the first conveying part and the second conveying part, the second conveying part being capable of moving along a first direction within the chamber to change the length of the fixing member extending out of the chamber, the third direction being perpendicular to the first direction and the second direction.

2. A split zero-profile fusion cage system according to claim 1, characterized in that: The main body comprises a recess, and the inner wall of the recess has a first thread; The fixing member has a first opening extending through the fixing member in a first direction; The fusion device system further comprises a fastener having a second thread on the outer side thereof. The fastener is inserted into the main body through the first opening and connected with the second thread through the first thread.

3. A split zero-profile fusion system according to claim 2, characterized in that: The transmission mechanism includes a sleeve having a first through hole and a second through hole penetrating along a first direction; The first conveying part includes a first rod, and the second conveying part includes a second rod; The first rod is adapted to the first through hole to pass through the first through hole, and the second rod is adapted to the second through hole to pass through the second through hole; The first rod is inserted into the chamber and passes through the inner space of the chamber, and the portion exposed outside the chamber is connected to the main body; the second rod is inserted into the chamber and connected to the fixing member in the chamber.

4. A split zero-profile fusion system according to claim 3, characterized in that: The portion 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 arranged on the head, and a thread matching the third thread is arranged on the inner wall of the third groove.

5. The split zero-profile fusion system according to claim 3, characterized in that: The first end of the first rod away from the chamber has a plurality of protrusions arranged circumferentially; 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.

6. A split zero-profile fusion system according to claim 3, characterized in that: The first conveying part includes a fixed block, which is arranged in the chamber and extends along the first direction. The fixed block penetrates a receiving space extending along the first direction, and the first rod is at least partially inserted into the receiving space.

7. A split zero-profile fusion system according to claim 6, characterized in that: The fixing 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, wherein the first block is arranged at a side away from the chamber opening and fixedly connected to the second rod; the second block is arranged at 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 fixing member; The second block has a third protrusion extending along the third direction, and the third protrusion abuts against the first inclined surface.

8. The split zero-profile fusion cage system according to claim 1, characterized in that: The middle of the spring sheet is symmetrically provided with strip-shaped first protrusions on both sides thereof, and a gap is provided between the first protrusions and the spring sheet to prevent the spring sheet from moving in the opposite direction to the entry direction after being inserted.

9. The split zero-profile fusion system according to claim 2, characterized in that: The inner wall of the first opening has a first retaining ring groove; The fastener is provided with a second protrusion, which is matched with the first opening; a second retaining ring groove is provided in the middle of the second protrusion, and an elastic retaining ring is sleeved in the second retaining ring groove; when the main body and the fixing member are fixed, the retaining ring abuts against the first retaining ring groove.

10. A method for using a split zero-profile fusion device system, using a split zero-profile fusion device system as claimed in any one of claims 1 to 9, characterized in that: include: Step 1: Connect the first transmission part to the main body, and connect the second transmission part to one of the two fixing parts; Moving the second conveying part to store the fixing member connected thereto into the chamber; Step 2: moving the transmission mechanism to move the main body connected thereto to a position to be inserted into the patient's body; Step 3: Separate the first transmission part from the main body connected thereto; Step 4: adjusting the position of the transmission mechanism according to the corresponding position of the position to be inserted, pushing the second transmission part so that the connected fixing piece extends out of the chamber, and embedding the spring piece into the tissue near the adjacent vertebrae of the position to be inserted, so that the fixing piece corresponds to the adaptation structure of the main body; Step 5: Separate the second transmission part from the fixing member connected thereto, and connect the main body to the fixing member; Step 6: Connect the second transmission part to another fixing member, and repeat steps 4 and 5 to complete the installation of the fusion device.

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