Intervertebral fusion device

Abstract

The invention relates to an interbody fusion device, comprising: a fusion cage assembly comprising a fusion body and a fixing clamp, one end of the fixing clamp being connected with the fusion body, the other end of the fixing clamp being inserted into an interbody bone surface; and the holding and driving assembly is configured to be capable of assembling the fusion cage assembly to the intervertebral space.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of medical devices, in particular to an intervertebral fusion device. BACKGROUND

[0002] With the aggravation of population aging, the incidence of lumbar disc herniation, cervical spondylosis, lumbar spondylolisthesis and other spinal degenerative diseases is increasing year by year, and patients need to improve the symptoms of nerve compression through surgical intervention. As a key solution to treat such diseases, intervertebral fusion surgery maintains intervertebral height and promotes intervertebral bone fusion to achieve spinal stability reconstruction. The fusion cage holding and driving device, as the core tool of the surgery, is responsible for the whole process of fusion cage grabbing, positioning, implanting and removing, and its operation flexibility, positioning accuracy and fixation stability directly determine the efficiency and effectiveness of the surgery. Especially in the promotion of new surgical procedures such as minimally invasive transforaminal endoscopic surgery and transforaminal lumbar interbody fusion, higher requirements are put forward for the miniaturization and operation convenience of the device, but the existing device cannot meet these adaptation requirements and cannot match the clinical application scenarios of new minimally invasive surgeries. SUMMARY

[0003] In view of the above analysis, the embodiments of the present application aim to provide an intervertebral fusion device, at least to solve one of the above problems.

[0004] The present application provides an intervertebral fusion device, comprising: a fusion cage assembly comprising a fusion body and a fixing clamp, one end of the fixing clamp being connected with the fusion body, and the other end of the fixing clamp being inserted into the bone surface of the intervertebral space; a holding and driving assembly configured to assemble the fusion cage assembly to the intervertebral space.

[0005] Further, the fusion cage assembly comprises two fixing clamps, and the two fixing clamps are arranged above and below the fusion body.

[0006] Further, the fusion cage body is provided with a bone graft window penetrating through the upper and lower end surfaces; the fusion cage body is also provided with a visible point position or a visible needle retention position; the upper surface of the fusion cage body is provided with a plurality of convex teeth, and the lower surface of the fusion cage body is provided with a plurality of sharp teeth; the center of the rear end of the fusion cage body is provided with a holding hole matched with the holding and driving assembly, and the holding and driving assembly is provided with a holding head matched with the holding hole; the two sides of the fusion cage body are respectively provided with clamping grooves, and the holding and driving assembly is provided with clamping blocks matched with the clamping grooves; the rear end of the fusion cage body is provided with insertion grooves on both sides of the holding hole, and the insertion directions of the two insertion grooves are oppositely arranged, and the fixing clamp is connected with the fusion cage body through the insertion grooves.

[0007] Further, the bottom of the slot is provided with a threaded hole.

[0008] Further, the main body comprises a main body and a fixing plate, the main body is provided with an assembly channel near the inner side of the two side walls, the front end of the fixing plate is provided with two assembly parts matched with the assembly channel, and the assembly parts are inserted into the assembly channel to assemble the main body and the fixing plate into the fusion body.

[0009] Further, the main body is located at the front end of the fixing plate, and the fixing clamp is connected with the fixing plate. The main body is provided with the bone graft window and the radiopaque needle storage position, the upper surface of the main body is provided with the protruding teeth, and the lower surface of the main body is provided with the sharp teeth. The fixing plate is provided with the holding and taking hole, the clamping groove, the slot and the threaded hole, the upper surface of the fixing plate is provided with the protruding teeth, and the lower surface of the fixing plate is provided with the sharp teeth.

[0010] Further, the fixing clamp comprises a fixing part and a plug, and the fixing part is located at one end of the inner top of the plug. The fixing part is provided with an insertion part matched with the slot. The fixing part is further provided with a boss located directly above the insertion part, and the outer edge of the fixing part is located on the outer side of the insertion part. The fixing part is provided with a screw hole penetrating the center of the insertion part and the boss, the screw hole is correspondingly penetrated through the threaded hole on the fusion body, the size of the screw hole is matched with the nail head of the screw used for fixing the fusion body and the fixing clamp, and the boss and the nail head are provided with a snap spring ring groove matched with a snap spring.

[0011] The plug is outwardly expanded when extending from top to bottom, and the thickness and width of the plug gradually decrease from top to bottom. The boss is provided with a slide strip on the opposite side, and the holding and taking and hitting assembly is provided with a slide rail matched with the slide strip.

[0012] Further, the holding and taking and hitting assembly comprises a sleeve, a holding and taking core rod and a striker. The center of the sleeve is provided with a holding and taking channel matched with the holding and taking core rod, and the holding and taking core rod penetrates through the holding and taking channel and extends into the holding and taking hole of the fusion body. The sleeve is provided with the slide rail matched with the slide strip of the fixing clamp. The two sides of the sleeve are respectively provided with a hitting channel matched with the striker, and the hitting channel is located directly above the slide rail, after the fixing clamp is placed on the slide rail, the fixing clamp is inserted into the vertebral body and connected with the fusion body by pushing or hitting the striker.

[0013] Further, the sleeve comprises a sleeve body and a chuck head at one end of the sleeve body; The sleeve body and the chuck head are connected by a support rod, the support rod is located on the center line of the sleeve, the holding channel respectively penetrates the center of the sleeve body, the support rod and the chuck head in sequence, the slide rail is located on the chuck head, the hitting channel extends from the first end of the sleeve body to the end of the sleeve body, and a guide groove is arranged on the side wall of the hitting channel and vertically extends from the first end to the end of the sleeve body. The chuck head comprises a center rod, a first clamping plate, a second clamping plate, a first connecting plate and a second connecting plate, the first end of the center rod is connected with the end of the support rod, the opposite ends of the center rod are connected with the first clamping plate and the second clamping plate through the first connecting plate and the second connecting plate respectively, and the first clamping plate and the second clamping plate are oppositely arranged. The end of the first clamping plate and the end of the second clamping plate are respectively provided with clamping blocks matched with the clamping grooves of the fusion body. The opposite positions of the center rod, the first connecting plate and the second connecting plate are respectively provided with slide rails. The sleeve further comprises a first guide plate and a second guide plate, the first guide plate and the second guide plate are arranged on one side of the chuck head, the first end of the first guide plate and the second guide plate is connected with the end of the sleeve body, the two sides of the first guide plate and the second guide plate are connected with the first clamping plate and the second clamping plate respectively, and the end of the first guide plate and the end of the second guide plate are connected with the end of the first clamping plate and the end of the second clamping plate. The outer side of the first guide plate is further provided with a limiting rib plate.

[0014] Further, the holding core rod comprises a core rod head, a stepped rod and a holding head connected in sequence, and the stepped rod is matched with the holding channel. The striker comprises a knocking head and a sliding rod, one end of the sliding rod is provided with the knocking head, the sliding rod is matched with the hitting channel, and the sliding rod is provided with a guide strip matched with the guide groove.

[0015] Compared with the prior art, the intervertebral fusion device of the present application has the following advantages: the simple structure of the intervertebral fusion device can meet the requirement of miniaturization of the surgical channel and can be adapted to new surgical procedures such as the transforaminal lumbar interbody fusion (TLIF) and the direct lateral interbody fusion (DLIF).

[0016] The above technical solutions can be combined with each other to realize more preferred combination schemes. Other features and advantages of the present application will be described in the subsequent specification, and some advantages will become apparent from the specification or can be understood by implementing the present application. The purpose and other advantages of the present application can be achieved and obtained from the specific indications in the specification and the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0017] The accompanying drawings are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the principles of the application. In the drawings:

[0018] Figure 1 Structure diagram of intervertebral fusion device (1) in the specific embodiment; Figure 2 Structure diagram of intervertebral fusion device (2) in the specific embodiment; Figure 3 Structure diagram of fusion cage assembly (1) in the specific embodiment; Figure 4 Structure diagram of fusion cage assembly (2) in the specific embodiment; Figure 5 Sectional view of fusion cage assembly in the specific embodiment; Figure 6 Structure diagram of fusion cage body (1) in the specific embodiment; Figure 7 Structure diagram of fusion cage body (2) in the specific embodiment; Figure 8 Structure diagram of fusion cage body (3) in the specific embodiment; Figure 9 Structure diagram of fusion cage body (4) in the specific embodiment; Figure 10 Sectional view of fusion cage body in the specific embodiment; Figure 11 Structure diagram of main body (1) in the specific embodiment; Figure 12 Structure diagram of main body (2) in the specific embodiment; Figure 13 Sectional view of main body in the specific embodiment; Figure 14 Structure diagram of fixation plate (1) in the specific embodiment; Figure 15 Structure diagram of fixation plate (2) in the specific embodiment; Figure 16 Structure diagram of fixation clip (1) in the specific embodiment; Figure 17 Structure diagram of fixation clip (2) in the specific embodiment; Figure 18 Structure diagram of fixation clip (3) in the specific embodiment; Figure 19 Sectional view of fixation clip in the specific embodiment; Figure 20Structure diagram of the holding and taking assembly in the embodiment; Figure 21 Structure diagram of the sleeve in the embodiment (1); Figure 22 Structure diagram of the sleeve in the embodiment (2); Figure 23 Local enlarged diagram of the sleeve in the embodiment; Figure 24 Structure diagram of the sleeve body in the embodiment (1); Figure 25 Structure diagram of the sleeve body in the embodiment (2); Figure 26 Sectional view of the sleeve body in the embodiment; Figure 27 Local enlarged diagram (1) of the sleeve body in the embodiment; Figure 28 Local enlarged diagram (2) of the sleeve body in the embodiment; Figure 29 Structure diagram (1) of the first guide plate in the embodiment; Figure 30 Structure diagram (2) of the first guide plate in the embodiment; Figure 31 Structure diagram (1) of the second guide plate in the embodiment; Figure 32 Structure diagram (2) of the second guide plate in the embodiment; Figure 33 Structure diagram of the holding and taking core rod in the embodiment; Figure 34 Local enlarged diagram of the holding and taking core rod in the embodiment; Figure 35 Structure diagram (1) of the striker in the embodiment; Figure 36 Structure diagram (2) of the striker in the embodiment.

[0019] Reference signs: 1-fusion assembly; 2-fusion body; 201-bone graft window; 202-visualization needle retention site; 203-tine; 204-prong; 205-holding hole; 206-clamping groove; 207-insertion slot; 208-threaded hole; 21-body; 211-fitting channel; 211a-fitting inlet; 211b-fitting outlet; 22-fixing plate; 221-fitting part; 3-fixing clamp; 31-fixing part; 311-insertion part; 312- boss; 313-screw hole; 314-screw; 315-clamp spring; 316-clamp spring ring groove; 317-sliding bar; 32-insertion sheet; 321-arc-shaped groove; 322-triangular groove; 4-holding and hitting assembly; 401-holding channel; 402-sliding rail; 403-hitting channel; 403a-guiding groove; 41-sleeve; 411-sleeve body; 412-chuck; 412a-center rod; 412b-first clamping plate; 412c-second clamping plate; 412d-first connecting plate; 412e-second connecting plate; 412f-clamping block; 413-branch rod; 414-first guide plate; 414a-first center plate; 414b-first side plate; 414c-limiting rib plate; 415-second guide plate; 415a-second center plate; 415b-second side plate; 42-holding core rod; 421-core rod head; 422-step rod; 423-holding head; 43-hitter; 431-guiding strip; 432-hitting head; 433-sliding rod; 433a-rib plate part. DETAILED DESCRIPTION

[0020] The preferred embodiments of the present application will be described in detail below with reference to the drawings, in which the same or similar components are denoted by the same reference numerals, and therefore the description will be omitted. The drawings constitute a part of this application. It should be noted, that the use of ordinary terms such as "connected", "coupled", "engaged", "attached", "connected" or "joined" along with the use of terms such as "element", "component", "step", "connection", "coupling", "engagement", "attachment", "connection" or "joint" should not be understood in a limiting sense. These terms are intended to encompass configurations that are equivalent in function, in addition to configurations that are direct and mechanical. It is further noted that, as used in the specification and the appended claims, the singular forms "a", "an" and "the" include plural referents unless the context clearly dictates otherwise.

[0021] In the description of the embodiments of the present application, it should be noted that unless otherwise explicitly stated and limited, the term "connected" should be interpreted broadly, 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. Those skilled in the art can understand the specific meaning of the above-mentioned term in the present application according to the specific circumstances.

[0022] The terms "top", "bottom", "above", "under" and "on" used throughout the description are relative positions of the 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.

[0023] The working surface of the present application can be flat or curved, and can be inclined or horizontal. For the convenience of description, the embodiment of the present application is placed on and used in a horizontal plane, and the "high and low" and "up and down" are defined accordingly.

[0024] In one embodiment of the present application, an intervertebral fusion device is disclosed, as shown in the accompanying drawings, comprising: Figures 1-36 A fusion assembly 1 comprising a fusion body 2 and a fixation clamp 3, one end of the fixation clamp 3 being connected to the fusion body 2, the other end of the fixation clamp 3 being inserted into the vertebral body (inserted into the upper endplate of the vertebral body or adjacent bone structure); A driving assembly 4 configured to be capable of assembling the fusion assembly 1 to the intervertebral space.

[0025] The intervertebral fusion device of the present application has a simple structure and can meet the requirement of "miniaturization" of the surgical channel, and can be adapted to new surgical procedures such as the transforaminal endoscopic surgery and the channel fusion surgery.

[0026] In order to ensure stable insertion of the fusion assembly into the vertebral body, the fusion assembly 1 comprises two fixation clamps 3, which are arranged above and below the fusion body 2, as shown in the accompanying drawings. Figure 3 The upper fixation clamp 3 is connected to the upper bone surface of the intervertebral space, and the lower fixation clamp 3 is connected to the lower bone surface of the intervertebral space.

[0027] The fusion body 2 is provided with a bone graft window 201 penetrating through the upper and lower end surfaces, so as to implant bone and increase fusion.

[0028] The fusion body 2 is also provided with a developing point or a developing needle storage site 202, so that the fusion assembly can be developed in the operation. Exemplarily, the developing needle storage site 202 is located at the front end of the side wall of the fusion body 2.

[0029] In order to ensure the stability of the fusion body 2 in the vertebral body, the upper surface of the fusion body 2 is provided with a plurality of convex teeth 203, and the lower surface of the fusion body 2 is provided with a plurality of sharp teeth 204, the tip of the sharp teeth 204 (the end away from the lower surface of the fusion body) being sharper than the tip of the convex teeth 203 (the end away from the upper surface of the fusion body). The tip of the convex teeth is a circular arc, so as to make the fusion body fit the upper endplate of the vertebral body (or adjacent bone structure) better, disperse stress and avoid local compression caused by bone damage; the tip of the sharp teeth is sharper, in order to prevent the fusion body from being displaced or rotated in the early stage after the operation, to provide basic mechanical support for bone fusion and improve the stability of the fusion body 2 in the vertebral body. The convex teeth and the sharp teeth extend from one side of the fusion body 2 to the other side, so as to be transversely arranged on the upper and lower surfaces of the fusion body. Preferably, the adjacent convex teeth and the adjacent sharp teeth are distributed at equal intervals.

[0030] ​The upper surface of the fusion body 2 is not provided with the protrusions 203 in the part in front of the bone graft window 201, and is provided with the protrusions in the other parts. The lower surface of the fusion body 2 is covered with the sharp teeth 204, so as to be better inserted into the vertebral body. Further, the ends of the protrusions and the sharp teeth are inclined backward (in the direction opposite to the direction of insertion into the vertebral body), so as to be more smoothly inserted into the vertebral body.

[0031] The center of the rear end (the end entering the vertebral body later) of the fusion body 2 is provided with a holding hole 205 matched with the holding and driving assembly, so as to hold the fusion body 2 by the holding and driving assembly 4 provided with a holding head 423 matched with the holding hole 205. In order to further improve the holding stability of the holding and driving assembly 4 to the fusion body 2, the two sides of the fusion body 2 are respectively provided with clamping grooves 206, and the two clamping grooves 206 are located at the rear ends of the two sides, i.e. the insertion openings of the clamping grooves 206 are located at the rear end surfaces of the fusion body 2. In order to improve the stability of clamping, the upper and lower clamping grooves 206 are staggered, i.e. one clamping groove 206 is close to the upper surface of the fusion body 2, and the other clamping groove 206 is close to the lower surface of the fusion body 2. The holding and driving assembly 4 is provided with clamping blocks 412f matched with the clamping grooves. In this way, the rotation movement of the fusion body in six degrees of freedom (the holding hole and the holding end limit the freedom of the fusion body in two directions of front and back, and the clamping grooves and the clamping head limit the freedom of the fusion body in four directions of up, down, left and right) can be effectively limited when the fusion body is held, so that the fusion body is stably held and does not deviate in any direction.

[0032] The rear end of the fusion body 2 is provided with insertion grooves 207 on the two sides of the holding hole 205, and the insertion directions of the two insertion grooves 207 are opposite, i.e. the insertion opening of one insertion groove 207 is located at the upper surface of the fusion body 2, and the insertion opening of the other insertion groove 206 is located at the lower surface of the fusion body 2. The fixing clamps 3 are connected with the fusion body 2 through the insertion grooves 207, and the two fixing clamps 3 are respectively embedded in the insertion grooves 207 from the upper and lower directions. In order to improve the connection strength of the fixing clamps 3 and the fusion body 2, the groove bottoms of the insertion grooves 207 are provided with threaded holes 208, so as to fix the fusion body 2 and the fixing clamps 3 by screws.

[0033] The fusion body 2 can adopt an integral forming structure, or can adopt an assembled structure.

[0034] Preferably, the fusion body 2 comprises a main body 21 and a fixing plate 22, the main body 21 is provided with an assembly channel 211 near the inner side of the two side walls, the fixing plate 22 is provided with two assembly parts 221 at the front end, which are matched with the assembly channel 211, the assembly part 221 is inserted into the assembly channel 211, so that the main body 21 and the fixing plate 22 are assembled into the fusion body 2. In this way, the materials of the main body 21 and the fixing plate 22 can be selected to be different, so that the adaptability and stability of the fusion assembly are better. For example, the material of the main body 21 is PEEK (Polyetheretherketone, polyether ether ketone) which is more suitable for human bone, and the material of the fixing plate 22 is metal which is the same as the material of the screw, such as TC4 metal (one of titanium alloy metals).

[0035] In order to improve the connection strength and stability of the main body 21 and the fixing plate 22, the assembly channel 211 is a "T" type channel, which extends forward from the rear end of the main body 21, and one end of the horizontal channel is located on the side wall of the main body 21, that is, the assembly inlet 211a of the assembly channel 211 is located on the rear end of the main body 21, and the assembly outlet 211b is located on the side wall of the main body 21. The shape of the assembly part 221 is an "L" type hook plate, the hook of the hook plate is bent inward, and when the assembly part 221 is inserted into the assembly channel, the hook at the end of the hook plate is embedded into one end of the horizontal channel inside the assembly channel 211.

[0036] The main body 21 is located at the front end of the fixing plate 22, and the fixing clamp 3 is connected with the fixing plate 22. Specifically, the main body 21 is provided with the bone graft window 201 and the radiopaque needle storage site 202, the upper surface of the main body 21 is provided with the protruding teeth 203, and the lower surface of the main body 21 is provided with the sharp teeth 204. The fixing plate 22 is provided with the holding and taking hole 205, the clamping groove 206, the insertion groove 207 and the threaded hole 208, the upper surface of the fixing plate 22 is provided with the protruding teeth 203, and the lower surface of the fixing plate 22 is provided with the sharp teeth 204. It should be noted that in order to improve the stability of the fusion assembly, the threaded hole 208 extends to the main body 21, and the extension position of the threaded hole 208 does not exceed the position of the bone graft window 201.

[0037] The fixing clamp 3 comprises a fixing part 31 and an insertion sheet 32, the fixing part 31 is located at one end of the top of the inner side (close to the side of the fusion body 2) of the insertion sheet 32, the width of the fixing part 31 is less than half of the width of the insertion sheet 32, that is, the fixing part 31 is located on one side of the center line of the insertion sheet 32, that is, the fixing part 31 is eccentrically arranged on the top of the inner side of the insertion sheet 32 and close to one end of the insertion sheet 32.

[0038] The fixed part 31 is provided with an insertion part 311 matched with the insertion slot 207, that is, the insertion part 311 can be embedded into the insertion slot 207. The fixed part 31 is further provided with a boss 312 located above the insertion part 311, and the outer edge of the fixed part 31 is located outside the insertion part 311, that is, the insertion part 311 and the boss 312 form a stepped structure with the boss being larger than the insertion part. The fixed part 31 is provided with a screw hole 313 penetrating the center of the insertion part 311 and the boss 312, the screw hole 313 is matched with the threaded hole 208 on the fusion body 2, and the size of the screw hole 313 is matched with the head of the screw 314 used for fixing the fusion body and the fixed clip, that is, the head of the screw is embedded into the screw hole 313 after the screw is tightened. In order to avoid screw backout, the snap spring 315 is arranged at the threaded connection between the screw and the fixed clip, and the boss 312 and the head are provided with the snap spring ring groove 316 matched with the snap spring 315, that is, part of the snap spring ring groove 316 is located on the boss 312, and the other part of the snap spring ring groove 316 is located on the head. The snap spring groove 316 is located at the bottom of the boss 312 and penetrates the screw hole 313, and the diameter of the snap spring ring groove 316 is larger than the hole diameter of the screw hole 313.

[0039] The shape of the insertion sheet 32 extends outward from top to bottom, and the thickness and width of the insertion sheet 32 gradually decrease from top to bottom, that is, the shape of the insertion sheet 32 is similar to the wing of a bird, so that the insertion sheet can be better inserted into the vertebral body fixed fusion body. In order to improve the stability of the insertion sheet 32, arc-shaped grooves 321 are formed in the two ends of the insertion sheet 32, and a triangular groove 322 is formed in the central part of the tail of the insertion sheet 32.

[0040] In order to ensure the stability of the insertion of the fixed clip 3, the two sides of the boss 312 are oppositely provided with slide strips 317, the holding and driving assembly 4 is provided with slide rails 402 matched with the slide strips 317, and the fixed clip 3 is inserted into the vertebral body through the holding and driving assembly 4.

[0041] The two fixed clips 3 are the same in structure, oppositely arranged and embedded into the insertion slots 207 at the ends of the fusion body 2, and then fixedly connected with the fusion body through the screw, the screw hole and the threaded hole.

[0042] The fusion device assembly of the application is operated in the whole process of grabbing, positioning, implanting and removing through the holding and driving assembly 4.

[0043] The holding and picking assembly 4 comprises a sleeve 41, a holding and picking core rod 42 and a striker 43. The sleeve 41 is provided with a holding and picking channel 401 in the center, which is matched with the holding and picking core rod 42, and the holding and picking core rod 42 extends into the holding and picking hole 205 of the fusion body 2 through the holding and picking channel 401. The sleeve 41 is provided with the slide rail 402 matched with the slide bar 317 of the fixing clamp. The two sides of the sleeve 41 are respectively provided with the striking channel 403 matched with the striker 43, and the striking channel 403 is located directly above the slide rail 402. After the fixing clamp 3 is placed on the slide rail 402, the fixing clamp is inserted into the vertebral body and connected with the fusion body 2 by pushing or striking the large striker 43.

[0044] The sleeve 41 comprises a sleeve body 411 and a chuck 412 located at one end of the sleeve body 411. The holding and picking channel 401 extends from the first end of the sleeve body 411 (the end away from the chuck) to the end of the chuck (the end away from the sleeve body). The slide rail 402 is located on the chuck 412. The striking channel 403 extends from the first end of the sleeve body 411 to the end of the sleeve body 411. Preferably, the outward side of the striking channel 403 is open to ensure that the movement of the striker 43 in the striking channel 403 is not hindered.

[0045] To ensure that the fixing clamp 3 can be smoothly assembled with the slide rail 402 of the sleeve 41, the sleeve body 411 and the chuck 412 are connected by a support rod 413 located on the center line of the sleeve 41. The holding and picking channel 401 respectively penetrates the centers of the sleeve body 411, the support rod 413 and the chuck 412 in sequence.

[0046] The chuck 412 is shaped like the head of a trident and comprises a central rod 412a, a first clamping plate 412b, a second clamping plate 412c, a first connecting plate 412d and a second connecting plate 412e. The first end of the central rod 412a is connected with the end of the support rod 412, the opposite ends of the central rod 412a are respectively connected with the first clamping plate 412b and the second clamping plate 412c through the first connecting plate 412d and the second connecting plate 412e, and the first clamping plate 412b is oppositely arranged with the second clamping plate 412c. The center of the central rod 412a is penetrated by the holding and picking channel 401. The ends of the first clamping plate 412b and the second clamping plate 412c are respectively provided with clamping blocks 412f matched with the clamping grooves 206 of the fusion body 2. That is, the chuck 412 is inserted into the clamping grooves on both sides of the fusion body 2 through the two clamping blocks 412f located at the ends of the first clamping plate and the second clamping plate, so that the auxiliary holding and picking core rod 42 can grasp the fusion body 2, thereby improving the stability and accuracy of grasping, positioning and implanting the fusion body 2.

[0047] The opposite positions of the center rod 412a and the first connecting plate 412d and the second connecting plate 413 are respectively provided with the slide rail 402, that is, the inner side (the side facing the center rod) of the center rod 412 and the first connecting plate 412d is provided with the slide rail 402 matched with the slide strip 317 of one of the two fixing clamps, and the inner side (the side facing the center rod) of the center rod 412 and the second connecting plate 412e is provided with the slide rail 402 matched with the slide strip 317 of the other of the two fixing clamps, and the slide rail 402 includes two opposite slide grooves, one of which is located on one side of the center rod, and the other is located on the inner side of the first connecting plate or the second connecting plate, and the slide grooves respectively extend from the first end to the end of the center rod, the first connecting plate and the second connecting plate. In order to ensure that the two fixing clamps are respectively inserted into the vertebral body from the upper and lower sides of the fusion body, the slide rail 402 is inclined upward or downward from the center position of the center rod, the first connecting plate (the second connecting plate).

[0048] In order to ensure the stability of the striker 43 in the striking channel 403, the side wall of the striking channel 403 is provided with a guide groove 403a extending vertically from the first end to the end of the sleeve body 411. Correspondingly, the striker 43 is provided with a guide strip 431 matched with the guide groove 403a. Exemplarily, the guide groove 403a is located on the side wall adjacent to the opening of the striking channel 403. Preferably, the guide groove 403a is through the striking channel 403, and the cross section (the cross section perpendicular to the center line of the striking channel 403) of the guide groove 403a is arc-shaped, so as to ensure the smooth movement of the striker in the striking channel 403.

[0049] In order to ensure that the two fixing clamps are respectively inserted into the vertebral body from the upper and lower sides of the fusion body, the slide rail 402 is inclined upward or downward from the center position of the center rod, the first connecting plate (the second connecting plate).

[0050] In order to further improve the stability and accuracy of the insertion of the fixing clamp 3 into the vertebral body, the sleeve 41 further includes a first guide plate 414 and a second guide plate 415, the first guide plate 414 and the second guide plate 415 are respectively arranged on one side of the clamp head 412, the first end of the first guide plate 414 (the second guide plate 415) is connected with the end of the sleeve body, the two sides of the first guide plate 414 (the second guide plate 415) are respectively connected with the first clamp plate and the second clamp plate, and the end of the first guide plate 414 (the second guide plate 415) is connected with the end of the first clamp plate and the second clamp plate, that is, the support rod 413 and the clamp head 412 are located between the first guide plate 414 and the second guide plate 415. The first guide plate 414 (the second guide plate 415) is provided with an inclined surface matched with the insertion piece 32 of the fixing clamp 3, so as to guide the insertion of the fixing clamp into the vertebral body.

[0051] Specifically, the first guide plate 414 comprises a first center plate 414a and first side plates 414b arranged on both sides of the first center plate 414a, the first center plate 414a is shaped as a "convex" plate, the narrow plate of the first center plate 414a is connected with the end of the sleeve body 411, the two sides of the wide plate of the first center plate 414a are connected with the first side plates 414b respectively, and the two first side plates 414b are connected with the first clamp plate and the second clamp plate respectively. The length of the wide plate of the first center plate 414a (the length on the center line of the sleeve) is less than the length of the first side plate 414b, preferably, the top and bottom of the first center plate are flush with the top and bottom of the first clamp plate (the second clamp plate) respectively. The inner side of the wide plate of the first center plate 414a (the side facing the center line of the sleeve) is an inclined surface, which is matched with the insertion piece of the fixing clamp. In addition, the outer side of the first guide plate 414 is further provided with a limiting rib plate 414c, the end of the limiting rib plate 414 is flush with the end of the first side plate, and the limiting rib plate is arranged for accurately positioning the assembly position of the intervertebral fusion cage, when the intervertebral fusion cage is inserted into the vertebral body, the limiting rib plate is abutted on the appropriate position of the vertebral body. In order to avoid affecting the insertion of the fixing clamp, part of the limiting rib plate 414c is connected with the outer side of the first center plate 414a, the remaining part of the limiting rib plate 414c is inclined outward, and the inclination is greater than that of the inclined surface of the first center plate. The structure and connection relationship of the second guide plate 415 are basically the same as those of the first guide plate, except that the second guide plate 415 is provided with one less limiting rib plate, that is, the second guide plate 415 comprises a second center plate 415a and second side plates 415b arranged on both sides of the second center plate 415a, and the structure and connection relationship of the second center plate and the second side plate are the same as those of the first center plate and the first side plate, which will not be described again.

[0052] The holding and taking core rod 42 comprises a core rod head 421, a stepped rod 422 and a holding and taking head 423 connected in sequence, the stepped rod 422 is matched with the holding and taking channel 401, the stepped rod 422 can be inserted into the holding and taking channel 401, and the core rod head 421 and the holding and taking head 423 are exposed at two ends of the holding and taking channel respectively. The holding and taking head 423 is detachably arranged at the end of the stepped rod 422 (an end away from the core rod head 421), the holding and taking head 423 is matched with the holding and taking hole 205 of the fusion body, that is, the holding and taking head 423 can be inserted into the holding and taking hole 205. In order to improve the grasping effect on the fusion body, an internal thread is arranged in the holding and taking hole, and an external thread matched with the internal thread is arranged outside the holding and taking head. The stepped rod 422 comprises a thick segment and a thin segment connected, the first end of the thick segment is connected with the core rod head 421, the end of the thick segment is connected with the first end of the thin segment, and the end of the thin segment is provided with the holding and taking head. The diameter of the thick segment is greater than that of the thin segment, and the length of the thick segment is much greater than that of the thin segment, so that the stability of the holding and taking core rod 42 in the holding and taking channel is improved, and the fusion cage assembly can be prevented from being hit too deep. Preferably, the diameter of the core rod head is much greater than that of the thick segment of the stepped rod, so as to facilitate the small hammer to hit the core rod head and drive the fusion cage body into the vertebral body; the diameter of the holding and taking head is greater than that of the thin segment of the stepped rod, so as to prevent the holding and taking core rod from sliding from the holding and taking channel and improve the connection strength of the holding and taking core rod and the sleeve.

[0053] The striker 43 comprises a knocking head 432 and a sliding rod 433, one end of the sliding rod 433 is provided with the knocking head 432, the sliding rod 433 is matched with the striking channel 403, the sliding rod 433 is driven to move in the striking channel 403 by applying force to the knocking head 432 (such as by hitting with a small hammer), and then the fixed clamp is hit into the vertebral body. The sliding rod 433 is provided with a guide strip 431 matched with the guide groove 403a, so as to ensure the stability of the striker 43 in the striking channel 403.

[0054] In order to improve the stability of the striker, the first end (an end close to the knocking head 432) of the sliding rod 433 is provided with a rib plate part 433a similar to a triangle, so as to improve the structural stability of the sliding rod 433 and avoid the first end of the sliding rod from being bent as much as possible due to large force applied to the knocking head. Preferably, the knocking head 432 is connected with the rib plate part 433a and is arranged in a staggered manner with the extension rod of the sliding rod 433, so as to avoid the knocking head 432 from affecting the movement of the sliding rod in the striking channel 403. Further, the length and width of the knocking head 432 are both greater than those of the top of the rib plate part 433a, that is, the projection of the knocking head 432 in the extension direction of the sliding rod 433 can completely cover the top of the rib plate part 433a, so as to better apply force to the striker.

[0055] The intervertebral fusion device of the present application uses the method: insert the holding core rod into the holding channel of the sleeve to expose the core rod head and the holding head respectively; hold the fusion body by the holding head and the clamping block of the sleeve cooperating with the holding hole and the clamping groove of the fusion body respectively; position the sleeve holding the fusion body at the appropriate vertebral position through the transforaminal lumbar interbody fusion (TLIF) and other surgical procedures, and then knock the core rod head with a small hammer to drive the sleeve and the fusion body to displace to the intervertebral position until the fusion body is inserted to the appropriate depth, wherein the depth of insertion of the fusion body is limited by the limiting rib plate; insert one fixing clamp into the sliding rail, insert the fixing clamp into the vertebral body by knocking the striker, and embed the insertion part of the fixing clamp into the insertion slot of the fusion body, and insert another fixing clamp in the same way, so that the two fixing clamps clamp the fusion body in the middle; put the clip spring into the clip spring ring groove of the fixing clamp, and then screw the screw into the screw hole and the threaded hole opposite to the fusion body in the fixing clamp through the locking screwdriver, so as to fix the fixing clamp and the fusion body. It should be noted that the screw can be screwed through the striking channel of the sleeve, or the holding rod and the sleeve can be removed from the fusion body before being screwed.

[0056] The fusion device of the present application is inserted into the vertebral body of the patient, which can relieve the pain of the patient, one fusion body is adapted to two fixing clamps, which are distributed on the upper and lower sides of the fusion body, and play a fixing role. The screw locks the fusion body and the fixing clamp to ensure the fixing strength, and the clip spring can ensure that the screw does not back out.

[0057] The present application aims to provide an intervertebral fusion device to solve the problem of insufficient adaptability of the existing device in the transforaminal lumbar interbody fusion (TLIF) and other new surgical procedures. The present application can overcome the difficulty of the existing device to meet the requirement of "miniaturization" of the surgical channel, and the structure of the fusion device assembly of the present application is simple and suitable for miniaturization.

[0058] The present application can also improve the defects of poor operation flexibility, low positioning accuracy and insufficient fixing stability of the existing device, reduce the time consumption caused by the operation problem of the instrument, realize the goal of "precisely completing the whole process operation of fusion device grabbing, positioning, implanting and removing in the maintenance scene", guarantee the operation efficiency and curative effect, and meet the use demand of the instrument for minimally invasive surgical procedures in clinic.

[0059] The intervertebral fusion device of the present application does not need to be operated many times and can be completed simply and conveniently. The core rod holds the fusion body, and the limiting rib plate of the sleeve controls the insertion direction and depth of the fusion body. The insertion channel of the fixing clamp and the striking channel are the same channel, and the insertion operation of the fixing clamp is completed by striking the channel.

[0060] The above merely describes preferred specific embodiments of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art can easily think of changes or replacements within the technical scope disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. The present invention relates to an intervertebral fusion device comprising: The fusion assembly comprises a fusion body and a fixing clamp, one end of the fixing clamp is connected with the fusion body, and the other end of the fixing clamp is inserted into the bone surface of the intervertebral space. The holding and driving assembly is configured to assemble the fusion assembly to the intervertebral space.

2. The intervertebral fusion device of claim 1 wherein, The fusion assembly comprises two fixing clamps, and the two fixing clamps are arranged above and below the fusion body.

3. The intervertebral fusion device of claim 2, wherein, The fusion body is provided with a bone graft window penetrating the upper and lower end surfaces. The fusion body is further provided with a developing point or a developing needle storage site. The upper surface of the fusion body is provided with a plurality of convex teeth, and the lower surface of the fusion body is provided with a plurality of sharp teeth. The center of the rear end of the fusion body is provided with a holding hole matched with the holding and driving assembly, and the holding and driving assembly is provided with a holding head matched with the holding hole. The two sides of the fusion body are respectively provided with a clamping groove, and the holding and driving assembly is provided with a clamping block matched with the clamping groove. The rear end of the fusion body is provided with an insertion slot on both sides of the holding hole, and the insertion directions of the two insertion slots are opposite, and the fixing clamp is connected with the fusion body through the insertion slot.

4. The intervertebral fusion device of claim 3, wherein, The slot bottom of the insertion slot is provided with a threaded hole.

5. The intervertebral fusion device of claim 4, wherein, The fusion body comprises a main body and a fixing plate, the inner side of the main body close to the two side walls is provided with an assembly channel, the front end of the fixing plate is provided with two assembly parts matched with the assembly channel, and the assembly parts are inserted into the assembly channel to assemble the main body and the fixing plate into the fusion body.

6. The intervertebral fusion device of claim 5, wherein, The main body is located at the front end of the fixing plate, and the fixing clamp is connected with the fixing plate. The main body is provided with the bone graft window, the developing needle storage site, the upper surface of the main body is provided with the convex teeth, and the lower surface of the main body is provided with the sharp teeth. The fixing plate is provided with the holding hole, the clamping groove, the insertion slot and the threaded hole, the upper surface of the fixing plate is provided with the convex teeth, and the lower surface of the fixing plate is provided with the sharp teeth.

7. The intervertebral fusion device according to any of claims 4 to 6, wherein, The fixing clamp comprises a fixing part and an insertion sheet, and the fixing part is located at one end of the inner top of the insertion sheet. The fixing part is provided with an insertion part matched with the insertion slot. The fixing part is further provided with a boss located directly above the insertion part, and the outer edge of the fixing part is located on the outer side of the insertion part. The fixing part is provided with a screw hole penetrating the center of the insertion part and the boss, the screw hole is correspondingly penetrated through the threaded hole on the fusion body, the size of the screw hole is matched with the nail head of the screw used for fixing the fusion body and the fixing clamp, the boss and the nail head are provided with a snap spring ring groove matched with the snap spring, the shape of the insertion sheet extends outward from top to bottom, and the thickness and width of the insertion sheet gradually decrease from top to bottom. The two sides of the boss are oppositely provided with slide strips, and the holding and driving assembly is provided with slide rails matched with the slide strips.

8. The intervertebral fusion device of claim 7, wherein, The holding and driving assembly comprises a sleeve, a holding core rod and a striker. The center of the sleeve is provided with a holding channel matched with the holding core rod, and the holding core rod penetrates through the holding channel and extends into the holding hole of the fusion body. The sleeve is provided with the slide rails matched with the slide strips of the fixing clamp. Two sides of the sleeve are respectively provided with a hitting channel, the hitting channel is matched with the striker, and the hitting channel is located directly above the slide rail.

9. The intervertebral fusion device of claim 8, wherein, The sleeve comprises a sleeve body and a chuck head located at one end of the sleeve body; The sleeve body and the chuck head are connected through a support rod, the support rod is located on the center line of the sleeve, the holding channel penetrates the center of the sleeve body, the support rod and the chuck head in sequence, the slide rail is located on the chuck head, the hitting channel extends from the first end of the sleeve body to the end of the sleeve body, and a guide groove is arranged on the side wall of the hitting channel. The chuck head comprises a center rod, a first clamping plate, a second clamping plate, a first connecting plate and a second connecting plate, the first end of the center rod is connected with the end of the support rod, the opposite ends of the center rod are connected with the first clamping plate and the second clamping plate through the first connecting plate and the second connecting plate respectively, and the first clamping plate and the second clamping plate are arranged oppositely. The end of the first clamping plate and the end of the second clamping plate are respectively provided with a clamping block matched with the clamping groove of the fusion body. The opposite positions of the center rod, the first connecting plate and the second connecting plate are respectively provided with a slide rail. The sleeve further comprises a first guide plate and a second guide plate, the first guide plate and the second guide plate are arranged on one side of the chuck head, the first end of the first guide plate and the second guide plate is connected with the end of the sleeve body, the two sides of the first guide plate and the second guide plate are connected with the first clamping plate and the second clamping plate respectively, and the end of the first guide plate and the second guide plate is connected with the end of the first clamping plate and the second clamping plate. The outer side of the first guide plate is further provided with a limiting rib plate.

10. The intervertebral fusion device of claim 9, wherein, The holding core rod comprises a core rod head, a stepped rod and a holding head connected in sequence, and the stepped rod is matched with the holding channel. The striker comprises a knocking head and a sliding rod, one end of the sliding rod is provided with the knocking head, the sliding rod is matched with the hitting channel, and the sliding rod is provided with a guide strip matched with the guide groove.

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