A bionic anatomical cervical intervertebral disc artificial prosthesis and a holder

Abstract

The present invention discloses a bionic anatomical cervical intervertebral disc artificial prosthesis and a holder, wherein the artificial prosthesis comprises an upper end plate, a central connecting part and a lower end plate; the upper surface of the upper end plate is a convex structure matching the bottom surface of the upper vertebral body, and the lower surface of the lower end plate is a concave structure matching the top surface of the lower vertebral body; one end of the central connecting part is fixedly connected to the upper surface of the lower end plate, and the other end is hinged to the ball socket of the lower surface of the upper end plate. The bionic anatomical cervical intervertebral disc artificial prosthesis can meet the needs of different individuals and avoid the phenomenon of front-to-back or left-to-right dislocation after surgery.

Description

Technical Field

[0001] The invention relates to the technical field of cervical intervertebral disc surgical instruments, and in particular to a bionic anatomical cervical intervertebral disc artificial prosthesis and a holder. Background Art

[0002] Since the anterior cervical decompression and fusion (ACDF) was first used to treat cervical spondylosis in the 1950s, it has undergone nearly 70 years of development and improvement. This procedure has become the "gold standard" for the treatment of cervical degenerative diseases. However, due to the fusion of the diseased segment, part of the cervical spine mobility is sacrificed, resulting in changes in the stress distribution of the adjacent segments and accelerated degeneration of the adjacent segments. In order to avoid these potential risks, artificial cervical disc replacement (ACDR) designed to preserve cervical spine mobility came into being. Currently, all cervical artificial disc prostheses used in clinical practice are imported products. It is worth looking forward to the research and development of artificial disc prostheses that meet the patient's cervical anatomical structure. Secondly, various types of foreign prostheses currently used in the market have obvious resection of the patient's normal cervical bony endplate before implantation, resulting in complications such as postoperative prosthesis sinking, displacement, and heterotopic ossification, and finally re-fusion surgery. This has led more and more scholars to reflect on ACDR with a more cautious attitude. In clinical application, the commonalities of all cervical disc prosthesis replacements currently in clinical use were analyzed. The design concept is that no matter what the cervical spine of each patient is, the prosthesis is polished according to the model of the prosthesis, so that the cervical spine can adapt to the prosthesis, rather than the prosthesis adapting to each different cervical spine. It was also found that when the prosthesis is installed, after 3 / 4 of the implant is inserted, a rear impactor is required to knock the prosthesis further into place, which will cause front-to-back or left-to-right misalignment. The current gripper cannot ensure that the prosthesis is implanted in the center of the cervical spine. Therefore, it is urgent to develop anatomical cervical prostheses and grippers that adapt to individual patients. Summary of the invention

[0003] In order to solve the problem of personalized needs for cervical intervertebral disc prostheses, the present invention provides a bionic anatomical cervical intervertebral disc prosthesis and a gripper, which can adapt to the needs of different individuals and avoid the phenomenon of front-to-back or left-to-right dislocation after surgery.

[0004] In order to achieve the above object, the present invention provides the following technical solutions.

[0005] A bionic anatomical cervical intervertebral disc prosthesis comprises an upper end plate, a central connecting portion and a lower end plate; the upper surface of the upper end plate is a convex structure matching the bottom surface of the upper vertebral body, and the lower surface of the lower end plate is a concave structure matching the top surface of the lower vertebral body; one end of the central connecting portion is fixedly connected to the upper surface of the lower end plate, and the other end is hinged to the ball socket of the lower surface of the upper end plate.

[0006] As a further improvement of the present invention, a plurality of barbs are provided on the upper surface of the upper end plate and the lower surface of the lower end plate.

[0007] As a further improvement of the present invention, the central connecting part includes a lower end and an upper end, the lower end is fixedly connected to the lower end plate, the upper end has a hemisphere, the lower surface of the upper end plate has a ball socket, the ball socket is cooperatively connected to the hemisphere, and the ball socket and the outside of the hemisphere have a sealing structure.

[0008] As a further improvement of the present invention, the central connecting portion further has a limiting piece, and the limiting pieces are arranged in multiple directions of the hemisphere.

[0009] As a further improvement of the present invention, the outer contours of the upper end plate and the lower end plate are both rectangular with rounded corners.

[0010] A holder for a bionic anatomical cervical intervertebral disc artificial prosthesis comprises a clamping head, an inner sleeve, an outer sleeve, an adjusting nut and a handle, wherein the clamping head is connected to the inner sleeve, the inner sleeve is connected to the handle, the outer sleeve is sleeved outside the inner sleeve, and the adjusting nut is fixedly connected to the outer sleeve;

[0011] The clamping head comprises a plurality of movable claws and a plurality of transverse plates; each movable claw is arranged at the end of a transverse plate, and the bionic anatomical cervical intervertebral disc artificial prosthesis is placed between the plurality of movable claws;

[0012] The inner sleeve has a thread on the outside, and the adjusting nut is threadedly connected to the inner sleeve. A gap is opened at the end of the inner sleeve to form multiple connecting rods. The connecting rods form an angle with the axis of the inner sleeve in a natural state, and each connecting rod end is connected to a movable claw; rotating the adjusting nut can adjust the distance between the end of the outer sleeve and the movable claw, thereby controlling the opening and tightening of the movable claw.

[0013] As a further improvement of the present invention, the connecting rod extends into the inner part of the outer sleeve for a certain distance.

[0014] As a further improvement of the present invention, the width of the gap gradually narrows from the movable claw to the inner sleeve.

[0015] As a further improvement of the present invention, a groove is provided on the movable claw, and a limit block is provided on the outer edge of the transverse plate.

[0016] As a further improvement of the present invention, four movable claws are provided for mounting the upper end plate and the lower end plate of the bionic anatomical cervical intervertebral disc prosthesis, and the grooves match the outer contours of the upper end plate and the lower end plate.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] In the artificial prosthesis of the present invention, the upper surface of the upper end plate matches the convex structure of the bottom surface of the upper vertebral body, and the lower surface of the lower end plate matches the concave structure of the top surface of the lower vertebral body, so that the bionic anatomical cervical intervertebral disc artificial prosthesis can adapt to the needs of different individuals and avoid the phenomenon of front-to-back or left-to-right dislocation after surgery. Since the upper end plate and the lower end plate match well, the patient's activities after surgery rely on the movement of the central connecting part, and daily activities are not restricted, and other complications will not increase.

[0019] The gripper provided by the present invention can match the clamping and surgical installation process of the bionic anatomical cervical intervertebral disc prosthesis. When the connecting rod is in a natural state, it forms an angle with the axis of the inner sleeve. The opening and tightening of the movable claws are controlled by adjusting the nut. The clamping is stable and well balanced. There is no problem of multiple positioning caused by tilting. It can be completed in one step, so that the surgical process is fast and the patient's pain is relieved.

[0020] Furthermore, since four movable claws are used to fix the upper and lower sides of the bionic anatomical cervical intervertebral disc prosthesis together, when the prosthesis is installed, the rear impactor is used to knock the prosthesis into place after 3 / 4 of the implantation, and there will be no front-to-back or left-to-right misalignment problem. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The drawings described herein are for explanation purposes only and are not intended to limit the scope of the present invention in any way. In addition, the shapes and proportional dimensions of the components in the drawings are only for illustration purposes to help understand the present invention, and are not intended to specifically limit the shapes and proportional dimensions of the components of the present invention. In the drawings:

[0022] Figure 1 A schematic diagram of a bionic anatomical cervical intervertebral disc prosthesis Figure 1 ;

[0023] Figure 2 A schematic diagram of a bionic anatomical cervical intervertebral disc prosthesis Figure 2 ;

[0024] Figure 3 A schematic diagram of a holder for a bionic anatomical cervical intervertebral disc prosthesis;

[0025] Figure 4 A cross-sectional view of a holder of a bionic anatomical cervical intervertebral disc prosthesis;

[0026] Figure 5It is an enlarged schematic diagram of a holder of a bionic anatomical cervical intervertebral disc prosthesis;

[0027] Figure 6 This is a schematic diagram of the usage status of a gripper of a bionic anatomical cervical intervertebral disc prosthesis. DETAILED DESCRIPTION

[0028] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the technical solutions 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 only 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 should fall within the scope of protection of the present invention.

[0029] It should be noted that when an element is referred to as being "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only embodiment.

[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0031] like Figure 1 to Figure 2 The present invention provides a bionic anatomical cervical intervertebral disc prosthesis, comprising an upper end plate 61, a central connecting portion 62 and a lower end plate 63; the upper surface of the upper end plate 61 is a convex structure that matches the bottom surface of the upper vertebral body, and the lower surface of the lower end plate 63 is a concave structure that matches the top surface of the lower vertebral body; one end of the central connecting portion 62 is fixedly connected to the upper surface of the lower end plate 63, and the other end is hinged to the ball socket 631 on the lower surface of the upper end plate 61.

[0032] In the artificial prosthesis of the present invention, the upper surface of the upper end plate matches the convex structure of the bottom surface of the upper vertebral body, and the lower surface of the lower end plate matches the concave structure of the top surface of the lower vertebral body, so that the bionic anatomical cervical intervertebral disc artificial prosthesis can adapt to the needs of different individuals and avoid the phenomenon of front-to-back or left-to-right dislocation after surgery. Since the upper end plate and the lower end plate match well, the patient's activities after surgery rely on the movement of the central connecting part, and daily activities are not restricted, and other complications will not increase.

[0033] The present invention is guided by the concept of bionics, integrates anatomical bionics into the design of existing artificial cervical intervertebral discs, and develops individualized artificial cervical intervertebral discs. Since the upper and lower surfaces of the prosthesis are anatomically matched with the adjacent vertebral endplates of the human body, the integrity of the bony endplates is retained during operation, and the adjacent surface adopts a cancellous bone structure with bone pores that are conducive to bone ingrowth, which can achieve long-term stability of the prosthesis and effectively prevent related complications after internal fixation. The prosthesis simultaneously realizes bionics of mechanical function, motion function, morphology and structure, and has good application prospects.

[0034] A plurality of barbs 64 are provided on the upper surface of the upper end plate 61 and the lower surface of the lower end plate 63, so that the end plates are not easy to fall off after the operation, which is beneficial to bone fusion.

[0035] As a preferred embodiment, the central connecting portion 62 includes a lower end and an upper end, the lower end is fixedly connected to the lower end plate 63, the upper end has a hemisphere 632, the lower surface of the upper end plate 61 has a ball socket 631, and the ball socket 631 is connected with the hemisphere 632. The ball socket 631 and the hemisphere 632 have a sealing structure outside. After the operation, the cervical spine can move to cause the ball socket 631 and the hemisphere 632 to rotate in coordination, simulating the human body structure for bionics.

[0036] The central connecting portion 62 also has a limiting piece 633, and the limiting piece 633 is arranged in multiple directions of the hemisphere 632. The limiting piece 633 can limit the hemisphere 632 in multiple directions such as front, back, left, and right to limit the bending movement of the cervical vertebra in multiple directions.

[0037] Furthermore, the outer contours of the upper end plate 61 and the lower end plate 63 are both rectangular with rounded corners, so as to facilitate the subsequent grabbing of matching tools.

[0038] like Figures 3 to 6 As shown, a holder of a bionic anatomical cervical intervertebral disc artificial prosthesis of the present invention comprises a clamping head 1, an inner sleeve 6, an outer sleeve 2, an adjusting nut 3 and a handle 4, wherein the clamping head 1 is connected to the inner sleeve 6, the inner sleeve 6 is connected to the handle 4, the outer sleeve 2 is sleeved outside the inner sleeve 6, and the adjusting nut 3 is fixedly connected to the outer sleeve 2;

[0039] The clamping head 1 includes a plurality of movable claws 11 and a transverse plate 14; the movable claws 11 are arranged at the ends of the transverse plate 14, and the bionic anatomical cervical intervertebral disc artificial prosthesis is placed between the plurality of movable claws 11;

[0040] The inner sleeve 6 has a thread on the outside, and the adjusting nut 3 is threadedly connected to the inner sleeve 6. A gap 51 is opened at the end of the inner sleeve 6 to form a plurality of connecting rods 52, and each connecting rod 52 is connected to a movable claw 11 at the end; the connecting rod 52 forms an angle with the axis of the inner sleeve 6 in a natural state, and rotating the adjusting nut 3 can adjust the distance between the end of the outer sleeve 2 and the movable claw 11, thereby controlling the opening and tightening of the movable claw 11.

[0041] The gripper provided by the present invention can match the clamping and surgical installation process of the bionic anatomical cervical intervertebral disc prosthesis, has stable clamping and good balance, does not have the problem of multiple positioning caused by tilt, and is completed in one step, making the surgical process fast and relieving the patient's pain.

[0042] The connecting rod 52 extends a certain distance into the inner part of the outer sleeve 2. By pushing the outer sleeve 2 to move, the movable claw 11 can be opened and tightened. The distance is determined based on the opening amplitude that needs to be adjusted.

[0043] As a preferred embodiment, the width of the gap 51 gradually narrows from the movable claw 11 to the inner sleeve 6 .

[0044] As a preferred embodiment, the movable claw 11 is provided with a groove 13, and the outer contours of the upper end plate 61 and the lower end plate 63 can be placed in the groove 13 for limiting. The outer edge of the transverse plate 14 is provided with a limiting block 12, which can make the upper end plate 61 and the lower end plate 63 body perform secondary limiting. In this way, the bionic anatomical cervical intervertebral disc artificial prosthesis can be quickly positioned and installed.

[0045] The movable claws 11 are provided with four for mounting the upper end plate 61 and the lower end plate 63 of the bionic anatomical cervical intervertebral disc artificial prosthesis, and the grooves 13 match the outer contours of the upper end plate 61 and the lower end plate 63. This makes the grip more secure and ensures that the upper and lower end plate surfaces of the prosthesis are displaced to the left and right sides when implanted.

[0046] Specifically, the closer the distance between the end of the outer sleeve 2 and the movable claw 11 is, the tighter the movable claw 11 is. Rotating the adjusting nut 3 can synchronously control the four movable claws 11 to open and tighten synchronously.

[0047] In addition, since there are multiple movable claws 11, the adjustment nut can change the space between the movable claws within a certain range to suit prostheses of different widths. After the nut is rotated, the upper and lower grooves are gradually locked to reduce the front-to-back misalignment of the upper and lower end plates of the prosthesis during implantation, and it is suitable for prostheses of different heights and sizes.

[0048] The bionic anatomical cervical intervertebral disc artificial prosthesis and the method of using the holder of the present invention are specifically as follows:

[0049] The bone data of the patient's cervical spine CT and other imaging images can be converted to obtain the required digital model file. The anatomical cervical prosthesis can be manufactured by 3D printing and other means to achieve a high degree of patient matching of the upper and lower end plates.

[0050] An anatomical cervical prosthesis is manufactured. After the intervertebral space is expanded, the cartilage end plate is processed without damaging the bony end plate, retaining the bone to the greatest extent, reducing the subsequent subsidence and displacement of the prosthesis and ossification, increasing the contact area between the anatomical cervical prosthesis and the end plate, improving the immediate stability, and accurately implanted into the cervical intervertebral space through the invention of a matching holder.

[0051] The clamping head 1 of the holder is grooved on the left and right sides to ensure that the upper and lower end plate surfaces of the prosthesis are displaced to the left and right sides when implanted, and is suitable for prostheses of different widths.

[0052] The clamping head 1 of the holder is slotted up and down, and the upper and lower slots are gradually locked by rotating the nut at the rear, thereby reducing the front-to-back misalignment of the upper and lower end plates of the prosthesis during implantation, and is suitable for prostheses of different heights and sizes.

[0053] The holder of the present invention can match artificial prostheses of different sizes, eliminating the need for the cumbersome work of using a holder of one model, thereby reducing the operation time during surgery.

[0054] It should be noted that, in the description of the present invention, the terms "first", "second", etc. are only used for descriptive purposes and to distinguish similar objects. There is no order of precedence between the two, and they cannot be understood as indicating or implying relative importance. In addition, in the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0055] It should be understood that the above description is for illustration and not for limitation. Many embodiments and many applications beyond the examples provided will be apparent to those skilled in the art upon reading the above description. Therefore, the scope of the present teachings should not be determined with reference to the above description, but rather with reference to the foregoing claims and the full scope of equivalents to which such claims are entitled. For the purpose of comprehensiveness, all articles and references, including disclosures of patent applications and publications, are incorporated herein by reference. The omission of any aspect of the subject matter disclosed herein in the foregoing claims is not intended to be a waiver of such subject matter, nor should it be considered that the applicant has not considered such subject matter to be part of the disclosed inventive subject matter.

Claims

1. A bionic anatomical cervical intervertebral disc prosthesis holder, characterized in that: The clamping head (1) comprises an inner sleeve (6), an outer sleeve (2), an adjusting nut (3) and a handle (4), wherein the clamping head (1) is connected to the inner sleeve (6), the inner sleeve (6) is connected to the handle (4), the outer sleeve (2) is sleeved outside the inner sleeve (6), and the adjusting nut (3) is fixedly connected to the outer sleeve (2); The clamping head (1) comprises a plurality of movable claws (11) and a plurality of transverse plates (14); each movable claw (11) is arranged at the end of a transverse plate (14), and the bionic anatomical cervical intervertebral disc artificial prosthesis is placed between the plurality of movable claws (11); The inner sleeve (6) has a threaded exterior, the adjusting nut (3) is threadedly connected to the inner sleeve (6), a slit (51) is formed at the end of the inner sleeve (6) to form a plurality of connecting rods (52), the connecting rods (52) form an angle with the axis of the inner sleeve (6) in a natural state, and the end of each connecting rod (52) is connected to a movable claw (11); the distance between the end of the outer sleeve (2) and the movable claw (11) can be adjusted by rotating the adjusting nut (3), thereby controlling the opening and tightening of the movable claw (11); The movable claw (11) is provided with a groove (13), and the outer edge of the transverse plate (14) is provided with a limit block (12); The movable claws (11) are provided with four and are used to mount an upper end plate (61) and a lower end plate (63) of a bionic anatomical cervical intervertebral disc artificial prosthesis, and the grooves (13) match the outer contours of the upper end plate (61) and the lower end plate (63).

2. The bionic anatomical cervical intervertebral disc prosthesis holder according to claim 1, characterized in that: The connecting rod (52) extends into the interior of the outer sleeve (2) for a certain distance.

3. The holder of the bionic anatomical cervical intervertebral disc prosthesis according to claim 1, characterized in that: The width of the gap (51) gradually narrows from the movable claw (11) to the inner sleeve (6).

Images