An artificial intervertebral disc implant system

Abstract

The present disclosure relates to an artificial intervertebral disc implant system, comprising an implant device, comprising a pair of parallel to each other draw hooks, the front end of the draw hooks is formed into an outward hook, the extension arm behind the hook is a straight line, the hook is respectively matched with the shape of the fixed end face of the left side of the two elastic arms, in the open state of the two hooks away from each other, the two hooks respectively hook the left end face of the two elastic arms; the sleeve ring is provided with two through holes, each draw hook respectively passes through one of the through holes, each through hole has an inner convex part, the two inner convex parts are centrally symmetric, when the two extension arms rotate between the inner convex parts, the two draw hooks are close to each other under the extrusion of the inner convex parts and disengage with the elastic arms. By setting the cooperation of the implant device end plate with accurate positioning, the artificial intervertebral disc can be implanted into the required position of the human body.

Description

Technical Field

[0001] This disclosure relates to the field of medical device technology, and more specifically to an artificial intervertebral disc implantation system. Background Technology

[0002] Artificial joints are already common orthopedic implants in current technology, such as ankle and knee joints. In recent years, artificial intervertebral discs and other joint prostheses involving the spine have also emerged. By using artificial intervertebral discs or other joint prostheses to replace damaged parts of the body, patients can experience functional replacement of the spine, alleviating pain to some extent and improving their quality of life.

[0003] In the present technology, most artificial intervertebral discs are designed with joint-like structures. Although these artificial intervertebral discs can simulate the structure and function of joints to a large extent, due to the limitations of materials and structure, although these intervertebral disc prostheses can realize the anterior and posterior twisting and torsional movements of the intervertebral disc, they cannot simulate the load buffering function of the human intervertebral disc, and the range of motion of the joint-like design is limited.

[0004] Due to the anatomical structure of the human intervertebral disc—high inside and low outside—the implantation of a conventional artificial intervertebral disc requires extensive removal of the superior and inferior endplates before the artificial disc is manually inserted. This makes the procedure complex and risky.

[0005] To prevent postoperative failure of artificial intervertebral discs, special attention must be paid to the placement of the artificial intervertebral disc during the surgical placement process. This ensures that the prosthesis can accurately transmit stress along the cervical spine's gravity load axis. Misalignment of the transmission axis can lead to postoperative anterior-posterior convexity of the prosthesis, resulting in surgical failure.

[0006] To simulate the function of an artificial intervertebral disc, Chinese invention patent application 202211665358.7 proposed an artificial intervertebral disc that simulates the function of an intervertebral disc quite well. However, this type of artificial intervertebral disc has the problem of difficult implantation. The safety and convenience of the implantation operation are also related to the success or failure of the intervertebral disc replacement surgery. Therefore, there is a need for an artificial intervertebral disc implantation system that can be reliably and safely implanted in order to obtain better implantation operation performance. Summary of the Invention

[0007] This disclosure is made based on the aforementioned needs of the prior art. The technical problem to be solved by this disclosure is to provide an artificial intervertebral disc implantation system that can conveniently implant an artificial intervertebral disc into the required position in the human body.

[0008] To address the aforementioned problems, the technical solutions provided in this disclosure include:

[0009] An artificial intervertebral disc implantation system includes an artificial intervertebral disc, the artificial intervertebral disc comprising an endplate slide and an endplate slide, the endplate slide being disposed on the endplate slide; two elastic arms are disposed on the lower surface of the endplate slide, the left sides of the two elastic arms being fixed to the lower surface of the endplate slide, and the right sides of the two elastic arms being free ends; the front surface of the front elastic arm and the rear surface of the rear elastic arm are provided with elastic arm serrations that respectively engage with the serrations of the front and rear side walls of the wide groove portion on the endplate slide; an implantation device includes a pair of parallel hooks, the hooks... The front end is formed as an outward hook, and the extension arm extends backward in a straight line from the hook. The hook is adapted to the shape of the left fixed end face of the two elastic arms. In the open state where the two hooks are far apart, the two hooks hook the left end face of the two elastic arms respectively. The collar has two through holes, and each hook passes through one of the through holes. Each through hole has an inner convex part. The two inner convex parts are centrally symmetrically arranged. When the two extension arms rotate between the inner convex parts, the two hooks come closer to each other and are in a contracted state under the compression of the inner convex parts, disengaging from the elastic arms.

[0010] Preferably, the implantation device further includes an operating handle, and the end of the extension arm of the hook is connected to the operating handle so that it is driven to rotate by the operating handle when the operating handle is rotated.

[0011] Preferably, a marking ring is provided on the outside of the operating handle. When the operating handle is rotated, the marking ring is independent of the operating handle. The phase between the operating handle and the marking ring indicates whether the hook is in an open or retracted state.

[0012] Preferably, the implantation device further includes a sleeve with an internal thread; the hook has a first tooth on its outer periphery, which meshes with the internal thread of the sleeve; when the sleeve rotates, the hook is driven to move back and forth based on the principle of the lead screw.

[0013] Preferably, a connector is provided on the outer periphery of the hook. The connector is cylindrical and fixedly disposed with the extension arm, and a second convex tooth is formed around the periphery of the connector.

[0014] Preferably, the implantation device further includes a guide cylinder, the front end of which is flat and the rear end of which is cylindrical. A guide groove is provided on the cylindrical part, and the second protruding tooth is accommodated in the guide groove to provide a stable sliding trajectory.

[0015] Preferably, the artificial intervertebral disc includes an upper endplate and a lower endplate. The lower surface of the upper endplate and the upper surface of the lower endplate are respectively provided with grooves. The grooves accommodate the upper and lower parts of the balloon. The groove wall of the upper endplate protrudes downward and the groove wall of the lower endplate protrudes upward.

[0016] Preferably, the upper end plate includes an upper end plate seat, an upper end plate sliding cover, and a locking pin; the upper surface of the upper end plate seat is provided with transverse sliding grooves at the front and rear ends, and a through intermediate sliding groove is provided between the transverse sliding grooves. The intermediate sliding groove includes a wide groove and a narrow groove. The wide groove extends to the right from the left end of the upper end plate seat, and the narrow groove extends to the left from the right end of the upper end plate seat. The wide groove and the narrow groove meet at the meeting point to form a step; the front and rear sidewalls of the wide groove are provided with serrations.

[0017] Preferably, an elastic locking arm is provided on the right side of the locking pin. The right side of the locking arm is fixedly mounted on the locking pin body, and the left side is a free end with an outwardly extending protrusion. When the locking pin is inserted into place, the left side of the elastic locking arm extends out from the narrow groove, and the protrusion abuts against the step at the right end of the wide groove.

[0018] Preferably, a positioning part is provided on the right side of the narrow groove, the width of the positioning part is greater than the width of the narrow groove, and the shape of the right side of the locking pin matches the positioning part to position the locking pin at the extreme position of leftward insertion.

[0019] Compared to existing technologies, this method, through the precise placement of the implantable endplate, allows for the placement of an artificial intervertebral disc into the desired location within the body. It possesses properties similar to native human tissue and is easy to operate. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this specification or the prior art, the drawings used in the description of the embodiments or 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 those skilled in the art, other drawings can be obtained based on these drawings.

[0021] Figure 1 A schematic diagram of the intervertebral disc structure within the vertebral body;

[0022] Figure 2 This is a schematic diagram of the structure of the artificial intervertebral disc in this specific embodiment;

[0023] Figure 3 This is a schematic diagram of the superior endplate structure of the artificial intervertebral disc in this specific embodiment;

[0024] Figure 4 This is a schematic diagram of the upper endplate sliding cover structure of the artificial intervertebral disc in this specific embodiment;

[0025] Figure 5 This is a schematic diagram of the structure of the artificial intervertebral disc in this specific embodiment;

[0026] Figure 6 This is a schematic diagram illustrating the operation of the implantation device for the artificial intervertebral disc system in this specific embodiment.

[0027] Figure 7 This is a partial enlarged view of the operation of the implantation device of the artificial intervertebral disc system in this specific embodiment;

[0028] Figure 8 A schematic diagram of the working structure of the collar of the implantation device for the artificial intervertebral disc system in this specific embodiment;

[0029] Figure 9 This is a partial structural diagram illustrating the operation of the implantation device for the artificial intervertebral disc system in this specific embodiment. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0031] In the description of the embodiments of this disclosure, it should be noted that, unless otherwise expressly specified and limited, the term "connected" should be interpreted broadly. For example, it can refer to a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this disclosure according to the specific circumstances.

[0032] Throughout the text, the terms “top,” “bottom,” “above,” “below,” and “on top” refer to the relative positions of components of the device, such as the relative positions of the top and bottom substrates within the device. It is understood that the device is multifunctional and independent of its spatial orientation.

[0033] To facilitate understanding of the embodiments of this application, the following will provide further explanation and description with reference to the accompanying drawings and specific embodiments. These embodiments do not constitute a limitation on the embodiments of this application.

[0034] This specific embodiment provides an artificial intervertebral disc implantation system, which enables the precise implantation of a joint prosthesis that can simulate the function of a human intervertebral disc with minimal damage through the rational design of the artificial intervertebral disc and implantation tools.

[0035] To address the aforementioned technical issues, the artificial intervertebral disc implantation system in this specific embodiment comprises two parts: an artificial intervertebral disc and an implantation tool.

[0036] For the artificial intervertebral disc portion

[0037] Intervertebral disc (001) refers to the cartilage between the upper vertebral body (002) and lower vertebral body (003) of two adjacent vertebrae in the human spine. The human intervertebral disc consists of an outer annulus fibrosus and a central nucleus pulposus.

[0038] The annulus fibrosus, composed of multiple layers of interlocking fibrocartilaginous rings, firmly connects the vertebral bodies. It possesses considerable elasticity and toughness, and in addition to bearing pressure, it also prevents the nucleus pulposus from leaking out. The nucleus pulposus is a white, gelatinous substance with high elasticity. When subjected to gravity, the nucleus pulposus expands outwards, compressing the annulus fibrosus to extend and expand further.

[0039] During spinal movement, the intervertebral discs undergo wedge-shaped deformation. When the spine flexes forward, the anterior half of the disc is flattened and thinned, while the posterior half thickens, and the nucleus pulposus moves posteriorly; the opposite occurs when the spine extends backward. When the spine flexes to the right, the right half of the disc thins while the left half thickens, and the nucleus pulposus moves to the left; the opposite occurs when the spine flexes to the left. Therefore, the intervertebral discs play a crucial role in increasing the range of spinal movement, bearing pressure, cushioning shocks, and protecting the brain and spinal cord; they are also a major factor in the variation in height between early and late stages.

[0040] Since both the annulus fibrosus and the central nucleus pulposus have a cushioning effect, and the annulus fibrosus, in particular, can provide cushioning at multiple angles and positions within the human intervertebral disc, current intervertebral disc prostheses strive to replicate the structure of the human intervertebral disc. However, it is difficult to completely replicate all the functions of the human spine. Furthermore, the intervertebral disc is located in a core and sensitive area of ​​the human spine. When implanting a prosthesis in this location, it is essential to avoid damaging the original spinal tissue as much as possible in order to preserve the most complete function of the human body.

[0041] Therefore, this specific embodiment provides an artificial intervertebral disc 1. In this specific embodiment, the structure of the artificial intervertebral disc is as follows: Figure 2-5 As shown.

[0042] The artificial intervertebral disc includes a superior endplate 2 and a inferior endplate 3 spaced apart from each other by a predetermined distance. The superior endplate 2 and inferior endplate 3 are made of rigid material to provide necessary support. The superior endplate 2 contacts the superior vertebral body at the location where the artificial intervertebral disc is implanted, and the inferior endplate 3 contacts the inferior vertebral body at the location where the artificial intervertebral disc is injected. The superior and inferior endplates are shaped to match the corresponding superior and inferior vertebral bodies, thereby facilitating the placement and function of the artificial intervertebral disc.

[0043] In addition to their vertical abutmentation, the upper and lower endplates also need to maintain sufficient holding force with the upper and lower vertebral bodies to prevent dislocation or displacement of the artificial intervertebral disc. Therefore, in this specific embodiment, the upper surface of the upper endplate and the lower surface of the lower endplate are also provided with fixing teeth 4. The fixing teeth extend from the upper or lower endplate towards the respective fixed vertebral bodies to contact and fix them. In one embodiment, the serrations are fixedly disposed on the outer surface of the upper or lower endplate, which provides a more stable connection and improves the stability of the connection.

[0044] More preferably, such as Figure 3 As shown, the upper end plate includes an upper end plate seat 21, an upper end plate sliding cover 22, and a locking pin 23.

[0045] The upper endplate seat is located below the upper endplate and is generally trapezoidal in shape to match the shape of the upper cone. The upper surface of the upper endplate seat has two transverse grooves 211 at the front and rear. These grooves are elongated and narrow. A through-type intermediate groove is provided between the transverse grooves. The intermediate groove includes a wide groove portion 212 and a narrow groove portion 213. The wide groove portion extends from the left end to the right, and the narrow groove portion extends from the right end to the left. The wide groove portion and the narrow groove portion intersect at the intersection to form a step.

[0046] The upper end plate sliding cover 22 is disposed on the upper end plate slide block. The upper surface of the upper end plate sliding cover is provided with fixing teeth 4, and the front and rear sides of its lower surface are provided with sliders 221 that cooperate with the sliding groove. Based on the guiding effect of the sliding groove 211 and the sliders 221, the upper end plate sliding cover can slide left and right on the upper end plate slide block to adjust its appropriate position, thereby adjusting the size and position of the upper end plate.

[0047] Although the groove 211 and slider 221 provide sliding, the intervertebral disc needs to be fixed to the vertebral body to provide stable cushioning. Therefore, a structure that is both easy to adjust and easy to fix is ​​also required. During the implantation of artificial intervertebral discs, sliding and fixation need to be easy to operate due to obstructions from various directions.

[0048] In this specific embodiment, the front and rear sidewalls of the wide groove 212 are provided with serrations 2121, and two elastic arms 222 are provided on the lower surface of the upper end plate slide cover. The left side of the two elastic arms is fixed to the lower surface of the upper end plate slide cover, and the right side of the two elastic arms is a free end, so that the two elastic arms have the elasticity to rebound along the front and rear direction.

[0049] The front surface of the front elastic arm and the rear surface of the rear elastic arm are provided with elastic arm serrations 2221 that respectively engage with the serrations 2121 of the front sidewall and the serrations of the rear sidewall of the wide groove. When the elastic arm serrations are embedded in the serrations of the wide groove, a stable engagement is formed. At this time, if the position of the elastic arm is fixed, the upper end cover seat and the upper end cover slide can be stably fixed by the multiple serrations without easily shaking or displacing.

[0050] Therefore, a locking pin 23 is provided in this specific embodiment. The locking pin slides from the narrow groove 213 into the wide groove and is inserted between the two elastic arms. In this way, the locking pin can open the two elastic arms, and the serrations 2221 of the elastic arms engage with the serrations 2121 of the wide groove, fixing the position of the upper end plate sliding cover. An elastic locking arm 231 is provided on the right side of the locking pin. The right side of the locking arm is fixedly mounted on the locking pin body, and the left side is a free end with an outwardly extending protrusion. When the locking pin is inserted into place, the left side of the elastic locking arm extends from the narrow groove, and the protrusion abuts against the step at the right end of the wide groove, thereby locking the position of the locking pin. In this specific embodiment, a positioning part 2131 can also be provided on the right side of the narrow groove. The width of the positioning part is greater than the width of the narrow groove, and the shape of the right side of the locking pin matches the positioning part to further position the locking pin. That is, the locking pin is locked so that it cannot move to the left or to the right.

[0051] Although the front-back and left-right directions are described in this specific embodiment, those skilled in the art will understand that the structures set in the front-back direction can be interchanged, and the structures set in the left-right direction can also be interchanged. This does not affect the operation of the upper end plate in this specific embodiment.

[0052] The lower endplate can have the same structure as the upper endplate. Of course, since the lower endplate needs to cooperate with the lower vertebral body, the lower endplate sliding cover is located below the lower endplate seat.

[0053] By designing the upper / lower endplate, or both, as a double-layer structure—including an endplate seat, an endplate sliding cover, and a locking pin—the system allows for fine-tuning and locking of the vertebral body position after artificial disc implantation and prosthesis placement. This provides a lifting and repositioning function, ensuring the vertebral body and prosthesis are positioned more physiologically, reducing the risk of surgical failure. Furthermore, these procedures can be performed unobstructed from the side, facilitating the operation.

[0054] In this specific embodiment, an elastic body 5 is provided between the upper and lower end plates. The elastic body comprises a multi-layer structure, with each layer having a ring-shaped cross-section. Adjacent layers are spaced a predetermined distance vertically. Each ring layer is composed of multiple n-type units 51, which are evenly arranged along the ring. The adjacent two sides of two adjacent n-type units are connected at the inner end of the ring, thus forming a structure that allows for rotational allowance and buffer space along the transverse plane.

[0055] Each layer's longitudinal section 52 is also n-shaped, meaning that the n-shaped unit is approximately n-shaped not only in the transverse section but also in the longitudinal section. In the longitudinal section, adjacent upper and lower n-shaped structures are aligned vertically, with their openings facing the inner ring and connected to each other at the inner ring position.

[0056] This creates a multi-layered structure that is interconnected with each other. This multi-layered structure can provide cushioning in the four directions of front, back, left, and right, as well as in the vertical and torsional directions, and has a cushioning and connection effect similar to that of the human intervertebral disc.

[0057] The upper layer of the elastomer is connected to the upper end plate, and the lower layer of the elastomer is connected to the lower end plate. For convenient and secure connection, annular grooves are provided on the lower surface of the upper end plate and the upper surface of the lower end plate, respectively. The walls of the annular grooves are engaged between the upper and lower layers of the elastomer, and the upper and lower layers of the elastomer are respectively placed into the grooves of the upper and lower end plates. This interlocking arrangement of the upper and lower end plates and the elastomer improves the stability of the connection between them.

[0058] The elastic body 5 is made by using a special cutting and heat treatment process to give the annular titanium alloy / nickel-titanium alloy metal block radial and axial elastic functions, and to realize tensile, compressive, bending and torsional movements.

[0059] A balloon 6 is also disposed between the upper and lower endplates. The balloon includes a balloon body 61, which is made of a flexible material, preferably an elastic material such as silicone. The balloon body is located vertically between the upper and lower endplates and horizontally within the ring of the elastic body. Preferably, the balloon is ellipsoidal, with its vertical height being less than its horizontal length, thus closely resembling the shape of the nucleus pulposus and providing similar elastic properties.

[0060] Grooves are provided on the lower surface of the upper endplate and the upper surface of the lower endplate, respectively. The grooves accommodate the upper and lower parts of the balloon. The groove wall of the upper endplate protrudes downward and the groove wall of the lower endplate protrudes upward. This not only accommodates the balloon, but also limits the position of the upper and lower endplates from getting too close to each other.

[0061] The balloon has an opening 62 on its side, and a valve 63 is provided in the opening. This allows for the injection of a filling solution, a silicone-based elastomer, hydrogel, or silicone into the balloon, thereby improving its elastic cushioning capacity and lifespan. Before the filling material is injected, the balloon's volume can be reduced. To facilitate balloon installation, in this specific embodiment, an opening is provided on the outer wall of the elastomer, through which the balloon can be inserted. The opening of the balloon is positioned opposite to the opening. After the balloon is inserted into the elastomer, the filling material is injected through the opening of the balloon, which then expands the artificial intervertebral disc. This facilitates the implantation operation.

[0062] The aforementioned artificial intervertebral discs can effectively mimic the structure and performance of the native human intervertebral discs. However, due to their complex structure, successful implantation remains a challenge.

[0063] Therefore, the artificial intervertebral disc system in this specific embodiment also includes an implantation device. The structure of the implantation device in this specific embodiment is as follows: Figure 6 As shown, its main purpose is to implant the main body of the artificial intervertebral disc into a predetermined position by means of the implantation device and the upper endplate seat 21, and then to lock the upper endplate seat 21 and the upper endplate sliding cover 22 by operating the locking pin 23.

[0064] The positioning and implantation of the upper endplate seat are crucial during this process. Its structure is complex, and appropriate clamping and implantation tools can increase the success rate of the surgery and reduce collateral damage.

[0065] In this specific embodiment, the structure of the implantation device 7 is as follows: Figure 6-9 As shown.

[0066] Specifically, the implantation device includes a pair of parallel hooks 71, the front end of which is formed as an outward hook 72 and an extension arm 73 extending substantially straight backward from the hook to be adapted to the shape of the left fixed end face of the two elastic arms 222 respectively. When the two hooks are in an open state away from each other, the two hooks respectively hook the left end face of the two elastic arms, and the extension arms of the two hooks respectively abut against the inner side of the two elastic arms, thereby fixing the relative position between the upper endplate seat 21 and the upper endplate sliding cover 22.

[0067] After the implantation device is fixed to the elastic arm, it can apply force to the artificial intervertebral disc. However, the implantation device also needs to be able to be removed from the artificial intervertebral disc via the intermediate groove 213, or partially inserted into the artificial intervertebral disc from the intermediate groove 213 in the initial state. Based on the above concept, in this specific embodiment, a collar 74 is provided on the extension arm of the hook. The collar has two through holes, and each hook passes through one of the through holes. Each through hole has an inner convex portion 75. The two inner convex portions are centrally symmetrically arranged. When the two extension arms rotate between the inner convex portions, the two hooks move closer to each other under the compression of the inner convex portions. The two hooks at their front ends are in a contracted state that moves closer to each other. At this time, the distance between the two hooks is less than the distance between the inner surfaces of the two elastic arms, so as to allow the hook to be implanted into or removed from the artificial intervertebral disc.

[0068] Preferably, an operating handle 76 is provided at the end of the extension arm of the hook. The operating handle cooperates with the extension arm to drive the extension arm to rotate together. A marking ring 77 may also be provided outside the operating handle. When the operating handle rotates, the marking ring is independent of the operating handle and does not move with the operating handle. The phase between the operating handle and the marking ring indicates whether the hook is in an open state or a retracted state.

[0069] Furthermore, the hook is provided with a first protruding tooth 78 on its outer periphery. The first protruding tooth meshes with the internal thread of a sleeve 79. When the sleeve rotates, based on the principle of the lead screw, the hook is driven to move back and forth to provide a larger operating force and maintain a uniform and stable movement trajectory.

[0070] To maintain the strength of the hook, a connector can be provided on the outer periphery of the hook. The connector is cylindrical and fixed to the extension arm. The periphery of the connector has serrated edges to support higher operating strength.

[0071] The sleeve-based rotary drive retractor provides stable motion, appropriate applied force, and ease of operation, thus reducing surgical trauma.

[0072] In this embodiment, the forward and backward movement of the hook, as well as the switching between opening and retraction, needs to have a stable motion trajectory because the hook includes an extension arm. To avoid unwanted swaying of the extension arm, the implantation device in this specific embodiment is also provided with a guide cylinder 711. The front end of the guide cylinder is flat to avoid swaying of the hook, and the rear end of the guide cylinder is cylindrical with a guide groove. The protruding teeth are accommodated in the guide groove to provide a stable sliding trajectory.

[0073] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of this application. It should be understood that the above description is only a specific embodiment of this application and is not intended to limit the scope of protection of this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. An artificial intervertebral disc implantation system, characterized in that, include An artificial intervertebral disc, comprising an endplate cover and an endplate slide, wherein the endplate cover is disposed on the endplate slide; Two elastic arms are provided on the lower surface of the endplate slide cover. The left sides of the two elastic arms are fixed to the lower surface of the endplate slide cover, and the right sides of the two elastic arms are free ends. The front surface of the front elastic arm and the rear surface of the rear elastic arm are provided with elastic arm serrations that respectively engage with the serrations of the front and rear sidewalls of the wide groove on the endplate slide. An implantation device includes a pair of parallel hooks. The front end of each hook is formed as an outward hook, and a straight extension arm extends backward from the hook. The hooks are respectively adapted to the shape of the left fixed end face of the two elastic arms. In the open state where the two hooks are far apart, the two hooks respectively hook the left end face of the two elastic arms. A collar has two through holes. Each hook passes through one of the through holes. Each through hole has an inner convex part. The two inner convex parts are centrally symmetrically arranged. When the two extension arms rotate between the inner convex parts, the two hooks come closer to each other and are in a contracted state under the compression of the inner convex parts, disengaging from the elastic arms.

2. The artificial intervertebral disc implantation system according to claim 1, characterized in that, The implantation device also includes an operating handle, the end of the extension arm of the hook being connected to the operating handle so as to be driven to rotate by the operating handle when the operating handle is rotated.

3. The artificial intervertebral disc implantation system according to claim 2, characterized in that, A marking ring is provided on the outside of the operating handle. When the operating handle is rotated, the marking ring is independent of the operating handle. The phase between the operating handle and the marking ring indicates whether the hook is in the open or retracted state.

4. The artificial intervertebral disc implantation system according to claim 1, characterized in that, The implantation device also includes a sleeve with an internal thread; the hook has a first tooth on its outer circumference, which meshes with the internal thread of the sleeve; when the sleeve rotates, the hook is driven to move back and forth based on the principle of the lead screw.

5. The artificial intervertebral disc implantation system according to claim 4, characterized in that, A connector is provided on the outer periphery of the hook. The connector is cylindrical and fixedly installed with the extension arm. A second convex tooth is formed around the periphery of the connector.

6. The artificial intervertebral disc implantation system according to claim 5, characterized in that, The implantation device also includes a guide cylinder, the front end of which is flat and the rear end of which is cylindrical. A guide groove is provided on the cylindrical part, and the second protruding tooth is accommodated in the guide groove to provide a stable sliding trajectory.

7. The artificial intervertebral disc implantation system according to claim 1, characterized in that, The artificial intervertebral disc includes a superior endplate and a inferior endplate. The lower surface of the superior endplate and the upper surface of the inferior endplate are respectively provided with grooves. The grooves accommodate the upper and lower parts of the balloon. The groove wall of the superior endplate protrudes downward and the groove wall of the inferior endplate protrudes upward.

8. The artificial intervertebral disc implantation system according to claim 7, characterized in that, The upper end plate includes an upper end plate seat, an upper end plate sliding cover, and a locking pin; the upper surface of the upper end plate seat is provided with transverse sliding grooves at the front and rear, and a through intermediate sliding groove is provided between the transverse sliding grooves. The intermediate sliding groove includes a wide groove and a narrow groove. The wide groove extends to the right from the left end of the upper end plate seat, and the narrow groove extends to the left from the right end of the upper end plate seat. The wide groove and the narrow groove meet at the meeting point to form a step; the front and rear sidewalls of the wide groove are provided with serrations.

9. The artificial intervertebral disc implantation system according to claim 8, characterized in that, The right side of the locking pin is provided with an elastic locking arm, which is fixedly mounted on the locking pin body on the right side. The left side is a free end with an outwardly extending protrusion. When the locking pin is inserted into place, the left side of the elastic locking arm extends out from the narrow groove, and the protrusion abuts against the step at the right end of the wide groove.

10. An artificial intervertebral disc implantation system according to claim 9, characterized in that, A positioning part is provided on the side of the narrow groove. The width of the positioning part is greater than the width of the narrow groove. The shape of the right side of the locking pin matches the positioning part to position the locking pin at the extreme position of leftward insertion.

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