GB2606806A

GB2606806A - Bionic-anatomical artificial cervical disc prosthesis and gripper

Info

Publication number: GB2606806A
Application number: GB2201045.8A
Authority: GB
Inventors: Hao Dingjun; Zhang Haiping
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-08-31
Filing date: 2022-01-27
Publication date: 2022-11-23
Anticipated expiration: 2042-01-27
Also published as: GB2606806B; CN113693794A; GB202201045D0

Abstract

In one aspect, a cervical disc prosthesis comprising upper and lower endplates 61, 63, and a central connection 62. An upper surface of the upper endplate has a convex structure, and a lower surface of the lower endplate has a concave structure. One end of the central connection is fixedly connected to the lower endplate, and the other end, which is preferably hemispherical 632, is hingedly connected to a ball socket 631 on the upper endplate. In another aspect, a gripper for a cervical disc prosthesis, the gripper comprising a clamping head (1, Fig 3) providing a plurality of movable claws (11, Fig 5). The head is connected to a socket (5, Fig 4), the end of which is notched (51, Fig 5) to form a plurality of connecting rods (52, Fig 5), each connected to a claw and forming an angle with respect to the axis of the socket. An adjustment nut (3, Fig 3) is fixedly connected to a sleeve (2, Fig 3) provided about the socket, and connected to a thread on the socket. Rotation of the nut adjusts a position of the sleeve with respect to the clamping head, controlling opening and closing of the claws.

Description

BIONIC-ANATOMICAL ARTIFICIAL CERVICAL DISC PROSTHESIS

AND GRIPPER

FIELD OF THE INVENTION

[0001] The present disclosure relates to the technical field of surgical instruments for cervical discs, and in particular, to a bionic-anatomical artificial cervical disc prosthesis and a gripper.

BACKGROUND OF THE INVENTION

[0002] Since the introduction of the anterior cervical decompression and fusion (ACDF) for the treatment of cervical spondylopathy in the 1950s, it has been developed and refined over the past 70 years, and has become a "gold standard" for the treatment of degenerative cervical diseases. However, due to the fusion of a diseased segment, cervical vertebra mobility is partially sacrificed, resulting in changes in stress distribution and accelerated degeneration of the adjacent segments. To avoid these potential risks, artificial cervical disc replacement (ACDR) was developed to preserve the cervical spine mobility. Artificial cervical disc prostheses in current clinical application are all imported products, and it is worth looking forward to the development of artificial intervertebral disc prostheses designed to fit the anatomical structure of the patient's cervical spine. Secondly, the patient's normal cervical bony endplate needs to be significantly excised before implantation of various types of foreign prostheses currently on the market, leading to complications such as postoperative sinking, displacement, and heterotopic ossification of the prosthesis, which eventually leads to re-fusion surgery. This has led an increasing number of academics to reflect on the clinical application of ACDR in a more cautious manner, and to analyze the commonality of all cervical disc prosthesis replacements in current clinical application. The design concept is to polish the prosthesis according to its model, regardless of the cervical vertebra of each patient, so that the cervical vertebra adapts to the prosthesis instead of the prosthesis adapting to each different cervical vertebra. Moreover, it was found that after 3/4 of the prosthesis is implanted during installation of the prosthesis, the prosthesis needs to be tapped further into place by a posterior driver, which may cause an anterior-posterior or side-to-side dislocation. An existing gripper cannot ensure that the prosthesis is implanted in the center of the cervical vertebra, so there is an urgent need to develop anatomical cervical prostheses and grippers suitable for individual patients.

SUMMARY OF THE INVENTION

[0003] To resolve the problem about the personalized demand for artificial cervical disc prostheses, the present disclosure provides a bionic-anatomical artificial cervical disc prosthesis which can adapt to requirements of different individualsand avoiding an anterior-posterior or side-to-side dislocation after surgery, and a gripper for the same.

[0004] To achieve the foregoing objective, the present disclosure provides the following technical solutions.

[0005] A bionic-anatomical artificial cervical disc prosthesis, including an upper endplate, a central connection part, and a lower endplate, where an upper surface of the upper endplate has a convex structure that matches with a bottom surface of an upper vertebral body; a lower surface of the lower endplate has a concave structure that matches with a top surface of a lower vertebral body; and one end of the central connection part is fixedly connected to an upper surface of the lower endplate, and the other end is hingedly connected to a ball socket on a lower surface of the upper endplate.

[0006] As a further improvement of the present disclosure, both the upper surface of the upper endplate and the lower surface of the lower endplate are provided with a plurality of barbs.

[0007] As a further improvement of the present disclosure, the central connection part includes a lower end and an upper end, where the lower end is fixedly connected to the lower endplate; the upper end has a hemisphere; the lower surface of the upper endplate has a ball socket; the ball socket fits with and is connected to the hemisphere; and a sealing structure is provided between the ball socket and the hemisphere.

[0008] As a further improvement of the present disclosure, the central connection part has a limiting piece, and the limiting piece is disposed in a plurality of directions of the hemisphere [0009] As a further improvement of the present disclosure, outer contours of the upper endplate and the lower endplate are both in a shape of rectangular and are rounded [0010] A gripper for a bionic-anatomical artificial cervical disc prosthesis, including a clamping head, an inner socket, an outer sleeve, an adjustment nut, and a handle, where the clamping head is connected to the inner socket, the inner socket is connected to the handle the outer sleeve is sleeved outside the inner socket, and the adjustment nut is fixedly connected to the outer sleeve; [0011] The clamping head includes a plurality of movable claws and a plurality of horizontal boards, where each of the movable claws is disposed at an end portion of one horizontal board, and the bionic-anatomical artificial cervical disc prosthesis is disposed among the plurality of movable claws; and [0012] The inner socket is threaded externally, the adjustment nut is threadedly connected with the inner socket, an end portion of the inner socket is provided with a notch to form a plurality of connecting rods, each of the connecting rods forms an angle with an axis of the inner socket in a natural state, an end portion of each of the connecting rods is connected with one movable claw, and a distance between an end portion of the outer sleeve and the movable claws can be adjusted by rotating the adjustment nut, so as to control opening and closing of the movable claws [0013] As a further improvement of the present disclosure the connecting rods extend into the outer sleeve for a certain distance.

[0014] As a further improvement of the present disclosure, a width of the notch gradually narrows from the movable claws to the inner socket.

[0015] As a further improvement of the present disclosure, each of the movable claws is provided with a recess, and a limiting block is disposed at an outer edge of the horizontal board. [0016] As a further improvement of the present disclosure, four movable claws are provided for mounting an upper endplate and a lower endplate of the bionic-anatomical artificial cervical disc prosthesis, and the recess matches with outer contours of the upper endplate and the lower endplate.

[0017] Compared with the prior art, the present disclosure has the following advantages [0018] In the artificial prosthesis in the present disclosure, the upper surface of the upper endplate has a convex structure that matches with the bottom surface of the upper vertebral body, and the lower surface of the lower endplate has a concave structure that matches with the top surface of the lower vertebral body. In this way, the bionic-anatomical artificial cervical disc prosthesis can adapt to requirements of different individuals, and avoid an anterior-posterior or side-to-side dislocation after surgery. Since the upper endplate and the lower endplate are each well matched, the patient's movement after surgery relies on the movement of the central connection part and there are no restrictions on daily activities and no additional complications.

[0019] The gripper provided in the present disclosure can match with a clamping and surgical installation process of the bionic-anatomical artificial cervical disc prosthesis. The connecting rod forms an angle with the axis of the inner socket in its natural state. The opening and closing of the movable claws are controlled by the adjustment nut, bringing in stable clamping and good balance. There is no problem of multiple positioning caused by tilting, and the artificial prosthesis is in place in one step, so that the surgery is quickly completed and pain of the patient is relieved.

[0020] Further, since an upper side and a lower side of the bionic-anatomical artificial cervical disc prosthesis are fixed by using four movable claws, after 3/4 of the prosthesis is implanted during installation of the prosthesis, the prosthesis is tapped further into place by a posterior driver, so that there is no anterior-posterior or side-to-side dislocation of the prosthesis

BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Accompanying drawings described herein are merely for illustration, and are not intended to limit the scope of the present disclosure in any way In addition, shapes and proportional sizes of various components in the figures are exemplary only for assisting in the understanding of the present disclosure, and do not specifically limit the shapes and the proportional sizes of the components in the present disclosure. In the drawings: [0022] FIG 1 is a schematic diagram 1 of a bionic-anatomical artificial cervical disc prosthesis; [0023] FIG 2 is a schematic diagram 2 of a bionic-anatomical artificial cervical disc 25 prosthesis; [0024] FIG. 3 is a schematic diagram of a gripper for a bionic-anatomical artificial cervical disc prosthesis; [0025] FIG 4 is a cross-sectional view of a gripper for a bionic-anatomical artificial cervical disc prosthesis; [0026] FIG. 5 is an enlarged schematic diagram of a gripper for a bionic-anatomical artificial cervical disc prosthesis; and [0027] FIG 6 is a schematic diagram of a gripper for a bionic-anatomical artificial cervical disc prosthesis in the state of use.

DETAILED DESCRIPTION OF THE EMBODIMENTS

[0028] To make a person skilled in the art better understand the technical solutions of the present disclosure, the technical solutions in the embodiments of the present disclosure are clearly and completely described below in combination with the accompanying drawings in the embodiments of the present disclosure. Obviously, the described embodiments are only a part of the embodiments of the present disclosure and are not all of them. According to the embodiments in the present disclosure, all other embodiments derived without creative effort by one of ordinary skills in the art should fall within the scope of the protection of the present disclosure.

[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 an intervening element may also exist. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or an intervening element may also exist. The terms "vertical", "horizontal", "left", and "right" and similar expressions used herein are for illustrative purposes only and do not mean a unique embodiment.

[0030] Unless defined otherwise, meanings of all technical and scientific terms in this specification are the same as those generally understood by a person skilled in the technical field of the present disclosure. The terms used in this specification of the present disclosure are merely for the purpose of describing specific embodiments, and are not intended to limit the present disclosure. The term "and/or" used in this specification includes any and all combinations of one or more related listed items.

[0031] As shown in FIG. 1 and FIG. 2, the present disclosure provides a bionic-anatomical artificial cervical disc prosthesis, including an upper endplate 61, a central connection part 62, and a lower endplate 63, where an upper surface of the upper endplate 61 has a convex structure that matches with a bottom surface of an upper vertebral body; a lower surface of the lower endplate 63 has a concave structure that matches with a top surface of a lower vertebral body; and one end of the central connection part 62 is fixedly connected to an upper surface of the lower endplate 63, and the other end is hingedly connected to a ball socket 631 on a lower surface of the upper endplate 61.

[0032] In the artificial prosthesis in the present disclosure, the upper surface of the upper endplate has a convex structure that matches with the bottom surface of the upper vertebral body, and the lower surface of the lower endplate has a concave structure that matches with the top surface of the lower vertebral body. In this way, the bionic-anatomical artificial cervical disc prosthesis can adapt to requirements of different individuals, and avoid an anterior-posterior or side-to-side dislocation after surgery. Since the upper endplate and the lower endplate each are well matched, the patient's movement after surgery relies on the movement of the central connection part and there are no restrictions on daily activities and no additional complications. [0033] According to the present disclosure, the concept of bionics is taken as a guide, and anatomical bionics is incorporated into the design of existing artificial cervical discs to develop individualized artificial cervical discs. Since an upper surface and a lower surface of the prosthesis anatomically match with the adjacent vertebral endplates of a human body, integrity of the bony endplates are retained during operation. Moreover, an abutment surface of the prosthesis adopts a cancellous bone-like structure with bone porosities that facilitates bone ingrowth, so that long-term stability of the prosthesis may be achieved, thereby effectively preventing complications associated with internal fixed implantation. Simultaneously, the prosthesis realizes bionics of a mechanical function, bionics of a motion function, morphological bionics, and structural bionics, and thus has good prospects for application [0034] Both the upper surface of the upper endplate 61 and the lower surface of the lower endplate 63 are provided with a plurality of barbs 64. In this case, the endplate after the surgery is not easy to fall off, thus facilitating bone fusion.

[0035] As a preferred embodiment, the central connection part 62 includes a lower end and an upper end, where the lower end is fixedly connected to the lower endplate 63; the upper end has a hemisphere 632; the lower surface of the upper endplate 61 has a ball socket 631; the ball socket 631 fits with and is connected to the hemisphere 632; and a sealing structure is provided between the ball socket 631 and the hemisphere 632. After the surgery, the cervical vertebra may move to cause the ball socket 631 cooperate with the hemisphere 632 to achieve rotation, so as to simulate the structure of the human body for bionics.

[0036] The central connection part 62 has a limiting piece 633, and the limiting piece 633 is disposed in a plurality of directions of the hemisphere 632. The limiting piece 633 may limit the hemisphere 632 in a plurality of directionshemisphere, i.e., anterior-posterior or side-to-side, so as to limit the flexural movements of the cervical vertebra in multiple directions.

[0037] Further, outer contours of the upper endplate 61 and the lower endplate 63 are both in a shape of rectangular and are rounded. This facilitates the grasping of the subsequent relevant tools [0038] As shown in FIG 3 to FIG 7, a gripper for a bionic-anatomical artificial cervical disc prosthesis is provided, the gripper including a clamping head 1, an inner socket 5, an outer sleeve 2, an adjustment nut 3, and a handle 4, where the clamping head 1 is connected to the inner socket 5, the inner socket 5 is connected to the handle 4, the outer sleeve 2 is sleeved outside the inner socket 5, and the adjustment nut 3 is fixedly connected to the outer sleeve 2.

[0039] The clamping head 1 includes a plurality of movable claws 11 and horizontal boards 14, where each of the movable claws 11 is disposed at an end portion of one horizontal board 14, and the bionic-anatomical artificial cervical disc prosthesis is disposed among the plurality of movable claws 11.

[0040] The inner socket 5 is threaded externally, where the adjustment nut 3 is threadedly connected with the inner socket 5, an end portion of the inner socket 5 is provided with a notch 51 to form a plurality of connecting rods 52, an end portion of each connecting rod 52 is connected with one movable claw 11, each connecting rod 52 forms an angle with an axis of the inner socket 5 in its natural state, and a distance between an end portion of the outer sleeve 2 and the movable claws 11 can be adjusted by rotating the adjustment nut 3, so as to control opening and closing of the movable claws 11.

[0041] The gripper provided in the present disclosure can be adaptable to a clamping and surgical installation process of the bionic-anatomical artificial cervical disc prosthesis, bringing in stable clamping and good balance. There is no problem of multiple positioning caused by tilting, and the artificial prosthesis is in place in one step, so that the surgery is quickly completed and pain of the patient is relieved.

[0042] The connecting rod 52s extend into the outer sleeve 2 for a certain distance. By advancing a moving position of the outer sleeve 2, the movable claws 11 can be opened and closed. The distance is determined based on an opening range that needs to be adjusted.

[0043] As a preferred embodiment, a width of the notch 51 gradually narrows from the movable claws 11 to the inner socket S. [0044] As a preferred embodiment, each of the movable claws 11 is provided with a recess 13, and outer contours of an upper endplate 61 and a lower endplate 63 may be placed in the recess 13 for limiting. A limiting block 12 is disposed at an outer edge of each horizontal board 14, so that main bodies of the upper endplate 61 and the lower endplate 63 may be further limited. In this way, the bionic-anatomical artificial cervical disc prosthesis may be quickly positioned and installed.

[0045] Four movable claws 11 are provided for mounting the upper endplate 61 and the lower endplate 63 of the bionic-anatomical artificial cervical disc prosthesis, and the recess 13 matches with the outer contours of the upper endplate 61 and the lower endplate 63. This enables a more reliable grasping prevents the upper and lower endplate surfaces of the prosthesis from displacing to left and right sides during implantation.

[0046] Specifically, the movable claws 11 will be closed as the distance between the end portion of the outer sleeve 2 and the movable claws 11 becomes shorter. By rotating the adjustment nut 3, four movable claws 11 may be synchronously controlled to be opened and closed at the same time.

[0047] In addition, Since there are a plurality of movable claws 11, a gap between the movable claws may be changed within a range by using the adjustment nut, so as to be suitable for prostheses with different widths. After the nut is rotated, upper and lower slots are gradually narrowed, which reduces anterior-posterior dislocations of the upper and lower endplates of the prosthesis during implantation, and thus being suitable for prostheses with different heights.

[0048] The methods for using the bionic-anatomical artificial cervical disc prosthesis and the gripper according to the present disclosure are described in detail as below.

[0049] A required digital model file may be obtained by collecting and converting bone data of radiographic images of the patient's cervical vertebra such as CT and the like. An anatomical cervical prosthesis is also manufactured, and in the specific manufacturing, 3D printing and other means may be adopted to achieve the upper endplate and the lower endplate that highly match with the patient.

[0050] After the anatomical cervical prosthesis is manufactured, an intervertebral space is propped open, and a cartilage endplate is processed without damaging the bony endplate, preserving the sclerotin to the greatest extent. In this case, subsequent sinking, displacement, and heterotopic ossification of the prosthesis are reduced, a contact area between the anatomical cervical prosthesis and the endplate is increased, and immediate stability is improved. Moreover, the anatomical cervical prosthesis is accurately implanted into the cervical intervertebral space by using the matched gripper in the present disclosure [0051] The clamping head 1 of the gripper is provided with slots at left and right sides, to ensure that the upper and lower endplate surfaces of the prosthesis are not displaced to the left and right sides during implantation, and are suitable for prostheses with different widths.

[0052] The clamping head 1 of the gripper is provided with slots at upper and lower sides. After the nut at the rear side is rotated, the upper and lower slots are gradually narrowed, which reduces anterior-posterior dislocations of the upper and lower endplates of the prosthesis during implantation, and thus being suitable for prostheses with different heights.

[0053] The gripper for the present disclosure may match with artificial prostheses of different sizes, eliminating the need for the tedious work to prepare one gripper per model and reducing operation time of the surgery.

[0054] It should be noted that the terms such as "first" and "second" in the description of the present disclosure are used only for the purpose of description and for distinguish between similar objects. There is no order of precedence between the terms "first" and "second", nor are they to be understood as indicating or implying the relative importance. In addition, in the description of the present disclosure, unless otherwise stated, the term "a plurality of' means two or more.

[0055] It should be understood that the foregoing description is for illustration and not for limitation. By reading the foregoing description, many embodiments and many applications other than the examples provided shall be obvious to a person skilled in the art. Therefore, the scope of the present teaching should not be determined by reference to the foregoing description, but rather by reference to the appended claims and the whole scope of equivalents of these claims. For comprehensive purposes, all articles and references, including the disclosure of patent application and publications, are incorporated herein by reference. The omission of any aspect of the subject matter disclosed herein from the appended claims is not intended to be a waiver of that subject matter, nor should it be considered that the applicant has not considered that subject matter as part of the subject matter of the present disclosure.

Claims

WHAT IS CLAIMED IS: I. A bionic-anatomical artificial cervical disc prosthesis, comprising an upper endplate (61), a central connection part (62), and a lower endplate (63), wherein an upper surface of the upper endplate (61) has a convex structure that matches with a bottom surface of an upper vertebral body; a lower surface of the lower endplate (63) has a concave structure that matches with a top surface of a lower vertebral body; and one end of the central connection part (62) is fixedly connected to an upper surface of the lower endplate (63), and the other end is hingedly connected to a ball socket on a lower surface of the upper endplate (61).
2 The bionic-anatomical artificial cervical disc prosthesis according to claim 1, wherein both the upper surface of the upper endplate (61) and the lower surface of the lower endplate (63) are provided with a plurality of barbs (64).
3 The bionic-anatomical artificial cervical disc prosthesis according to claim 1, wherein the central connection part (62) comprises a lower end and an upper end; the lower end is fixedly connected to the lower endplate (63); the upper end has a hemisphere (632); the lower surface of the upper endplate (61) has a ball socket (631); the ball socket (631) fits with and is connected to the hemisphere (632); and a sealing structure is provided between the ball socket (631) and the hemisphere (632).
4 The bionic-anatomical artificial cervical disc prosthesis according to claim 1, wherein the central connection part (62) has a limiting piece (633), and the limiting piece (633) is disposed in a plurality of directions of the hemisphere (632).
5. The bionic-anatomical artificial cervical disc prosthesis according to claim 1, wherein outer contours of the upper endplate (61) and the lower endplate (63) are both in a shape of rectangular and are rounded
6 A gripper for a bionic-anatomical artificial cervical disc prosthesis, comprising a clamping head (1), an inner socket (5), an outer sleeve (2), an adjustment nut (3), and a handle (4), wherein the clamping head (1) is connected to the inner socket (5), the inner socket (5) is connected to the handle (4), the outer sleeve (2) is sleeved outside the inner socket (5), and the adjustment 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 horizontal boards (14), wherein each of the movable claws (11) is disposed at an end portion of one horizontal board (14), and the bionic-anatomical artificial cervical disc prosthesis is disposed among the plurality of movable claws (11); and the inner socket (5) is threaded externally, wherein the adjustment nut (3) is threadedly connected with the inner socket (5), an end portion of the inner socket (5) is provided with a notch (51) to form a plurality of connecting rods (52), each of the connecting rods (52) forms an angle with an axis of the inner socket (5) in a natural state, an end portion of each of the connecting rods (52) is connected with one movable claw (11), and a distance between an end portion of the outer sleeve (2) and the movable claws (11) can be adjusted by rotating the adjustment nut (3), so as to control opening and closing of the movable claws (11).
7. The gripper for a bionic-anatomical artificial cervical disc prosthesis according to claim 6, wherein the connecting rods (52) extend into the outer sleeve (2) for a certain distance.
8 The gripper for a bionic-anatomical artificial cervical disc prosthesis according to claim 7, wherein a width of the notch (51) gradually narrows from the movable claws (11) to the inner socket (5).
9. The gripper for a bionic-anatomical artificial cervical disc prosthesis according to claim 6, wherein each of the movable claws (11) is provided with a recess (13), and a limiting block (12) is disposed at an outer edge of the horizontal board (14).The gripper for a bionic-anatomical artificial cervical disc prosthesis according to claim 6, wherein four movable claws (11) are provided for mounting an upper endplate (61) and a lower endplate (63) of the bionic-anatomical artificial cervical disc prosthesis, and the recess (13) matches with outer contours of the upper endplate (61) and the lower endplate (63).