CN113208785A

CN113208785A - Vertebral body prosthesis

Info

Publication number: CN113208785A
Application number: CN202110649929.7A
Authority: CN
Inventors: 王彩梅; 李志疆
Original assignee: Beijing AK Medical Co Ltd
Current assignee: Beijing AK Medical Co Ltd
Priority date: 2021-06-10
Filing date: 2021-06-10
Publication date: 2021-08-06
Anticipated expiration: 2041-06-10
Also published as: CN113208785B

Abstract

The invention provides a vertebral prosthesis, comprising: a body structure; a plurality of first endplates are replaceably connected to the first end of the body structure. A plurality of second endplates are replaceably connected to the second end of the body structure. Wherein the height of the body structure is adjustably positionable to vary the distance between the first endplate and the second endplate. The technical scheme of the application effectively solves the problem that the matching of the end plate and the vertebral body of the human body in the related technology is poor, and then the implantation effect is influenced.

Description

Vertebral body prosthesis

Technical Field

The invention relates to the technical field of medical instruments, in particular to a vertebral body prosthesis.

Background

Patients with primary tumors of vertebral bodies of the spine, partial metastatic tumors, serious comminuted fractures of the vertebral bodies, serious explosive fissures of the spine and the like often need to perform vertebral body excision or secondary complete excision. The stability of the spine after removal of the vertebral body is undoubtedly impaired and reestablishing the structural function of the spine is a necessary condition for maintaining the normal biomechanical stability of the spine.

At present, the height-adjustable type can be divided into a fixed height type and an adjustable height type according to the structural difference.

The artificial vertebral body with the fixed height is the simplest and single type, only plays a certain supporting and fixing role in the operation, and is represented by a common titanium cage, a novel titanium cage, a 3D printing titanium cage and the like. The prosthesis of the type is lack of a height adjusting device, the height cannot be adjusted in time in the operation, most of self-stabilizing devices are conical spikes or sawtooth-shaped protrusions which are positioned on the end face of the prosthesis, sufficient stability is difficult to guarantee, and a titanium plate or a nail rod system is needed for assisting in fixing in the operation. The adjustable fixed artificial vertebral body is formed by adding a height adjusting device on a supporting fixed artificial vertebral body, and the device is mostly realized by relative sliding of an inner sleeve and an outer sleeve and takes a Synex artificial vertebral body, a novel expandable artificial vertebral body, a snake-brand hydro artificial vertebral body and the like as representatives.

However, the spine of a human body has physiological curvature, and the angle of the end plate of the existing product is always fixed, so that the end plate is poor in matching with the vertebral body of the human body, and the implantation effect is influenced.

Disclosure of Invention

The invention mainly aims to provide a vertebral body prosthesis, which aims to solve the problem that the matching of an end plate and a vertebral body of a human body in the related technology is poor, and the implantation effect is influenced.

In order to achieve the above object, the present invention provides a vertebral body prosthesis comprising: a body structure; a plurality of first endplates are replaceably connected to the first end of the body structure. A plurality of second endplates are replaceably connected to the second end of the body structure. Wherein the height of the body structure is adjustably positionable to vary the distance between the first endplate and the second endplate.

Further, the main body structure comprises a first main body part and a second main body part, the second main body part is arranged on the first main body part, and the second main body part moves up and down along the axis of the first main body part.

Further, the second body portion includes a driving member and a supporting member, the driving member and the supporting member are in driving fit, and the supporting member is located between the driving member and the first end plate.

Further, the first main body part comprises an external thread, the driving part comprises an internal thread, the supporting part comprises a sleeve, the external thread is in threaded connection with the internal thread, and the first end plate is detachably connected to the sleeve.

Furthermore, the upper surface of the driving piece is provided with an inclined plane, the inclined plane gradually decreases from the direction close to the first main body part to the direction away from the first main body part, and a plurality of convex teeth are arranged on the inclined plane at intervals.

Further, an operation work accommodating opening is formed in the sleeve, and the opening direction of the operation work accommodating opening faces the convex teeth.

Furthermore, a first clamping structure is arranged between the sleeve and the first end plate, and a second clamping structure is arranged between the second end plate and the first main body part.

Furthermore, the first clamping structure comprises two first clamping structures which are arranged oppositely, the second clamping structure comprises two second clamping structures which are arranged oppositely.

Furthermore, the first clamping structure comprises a groove arranged at one end, far away from the driving part, of the sleeve, a first clamping table is arranged in the groove, the first clamping structure further comprises a first connecting arm connected with the first end plate, a first buckle is arranged on the first connecting arm, at least part of the structure of the first connecting arm is located in the groove, and the first clamping table is in clamping fit with the first buckle.

Further, first main part still includes the connecting seat, and second joint structure is provided with second card platform including setting up the convex part on the lateral wall of connecting seat on the convex part, and second joint structure still includes the second linking arm of being connected with the second end plate, is provided with the second buckle on the second linking arm, and second card platform and second buckle joint cooperation.

By applying the technical scheme of the invention, the plurality of first end plates and the plurality of second end plates can be alternatively arranged at two ends of the main body structure, so that the vertebral body prosthesis can select the first end plate and the second end plate with proper inclination angles according to the requirements of a patient, and the postoperative effect of the patient can be further improved. Simultaneously, the height of major structure is adjustable, and then change the distance between first endplate and the second endplate through the regulation of major structure's height promptly, makes the centrum prosthesis of this application can adapt the not centrum of the patient of equidimension like this, and then makes the commonality of the centrum prosthesis of this application better.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:

FIG. 1 shows a schematic front view of an embodiment of a vertebral body prosthesis according to the invention;

FIG. 2 shows a schematic cross-sectional view of the vertebral prosthesis of FIG. 1;

FIG. 3 shows a perspective view of the main structure of the vertebral prosthesis of FIG. 1;

FIG. 4 illustrates a perspective view of a first endplate of the vertebral prosthesis of FIG. 1; and

fig. 5 shows a perspective view of a second endplate of the vertebral prosthesis of fig. 1.

Wherein the figures include the following reference numerals:

10. a body structure; 11. a first main body portion; 111. a connecting seat; 12. a second main body portion; 121. a drive member; 122. a support member; 1221. operating the work receiving port; 123. a convex tooth; 20. a first endplate; 30. a second endplate; 40. a first clamping structure; 41. a groove; 411. a first chuck table; 42. a first connecting arm; 421. a first buckle; 50. a second clamping structure; 51. a convex portion; 511. a second chuck table; 52. a second connecting arm; 521. and a second buckle.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

The relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

To facilitate height adjustment between the first endplate and the second endplate, as shown in fig. 1-3, in this embodiment, the vertebral body prosthesis comprises: a main body structure 10, a first endplate 20, and a second endplate 30. A plurality of first endplates 20 are alternatively attached to the first end of the body structure 10. A plurality of second endplates 30 may alternatively be attached to the second end of the body structure 10. Wherein the height of the body structure 10 is adjustably positioned to vary the distance between the first endplate 20 and the second endplate 30.

By applying the technical scheme of the embodiment, the plurality of first end plates 20 and the plurality of second end plates 30 can be replaceably installed at two ends of the main body structure 10, so that the vertebral body prosthesis selects the first end plates 20 and the second end plates 30 with proper inclination angles according to the requirements of a patient, and the postoperative effect of the patient can be further improved. Meanwhile, the height of the main body structure 10 is adjustable, that is, the distance between the first end plate 20 and the second end plate 30 is changed by adjusting the height of the main body structure 10, so that the vertebral body prosthesis of the present embodiment can be adapted to vertebral bodies of patients with different sizes, and the universality of the vertebral body prosthesis of the present application is better.

It should be noted that the first and

second endplates

20, 30 described above are only capable of being installed with one

first endplate

20, 30 each time they are installed on the host structure 10.

In order to facilitate the distance between the first end plate and the second end plate to be changed, as shown in fig. 1 to 3, in the present embodiment, the main body structure 10 includes a first main body portion 11 and a second main body portion 12, the second main body portion 12 is disposed on the first main body portion 11, and the second main body portion 12 moves up and down along the axis of the first main body portion 11. The second main body part 12 can move up and down along the axis of the first main body part 11, so that the height of the main body structure 10 can be changed, and the vertebral body prosthesis has better universality and can be adapted to more patients.

In order to reduce the complexity of the overall structure, as shown in fig. 1 to 3, in the present embodiment, the second body portion 12 includes a driving member 121 and a supporting member 122, the driving member 121 and the supporting member 122 are in driving fit, and the supporting member 122 is located between the driving member 121 and the first end plate 20. The driving member 121 is provided to move the supporting member 122 up and down. Thereby enabling adjustment of the height of the body structure 10.

As shown in fig. 1 to 3, in the present embodiment, the first body portion 11 includes an external thread, the driving member 121 includes an internal thread, the supporting member 122 includes a sleeve, the external thread and the internal thread are threadedly engaged, and the first end plate 20 is detachably connected to the sleeve. The sleeve, the internal thread and the external thread are simple in structure and convenient to set, and the internal thread and the external thread are matched, so that the driving piece 121 can drive the supporting piece 122 to move upwards, and when the driving piece 121 moves downwards, the supporting piece 122 can move downwards along with the gravity and the pressure of the first end plate 20. Specifically, the first body portion 11 is a threaded rod. The driving member 121 is a nut.

In embodiments not shown in the figures, the drive member may also be a push rod or a snap.

As shown in fig. 1 to 3, in the present embodiment, the upper surface of the driving member 121 is provided with an inclined surface, the inclined surface gradually decreases from the direction close to the first main body 11 to the direction away from the first main body 11, and a plurality of convex teeth 123 are spaced on the inclined surface. The plurality of teeth 123 are provided to facilitate the operation of the driver 121 even when the driver 121 rotates.

For convenience of operation, as shown in fig. 1 to 3, in the present embodiment, the sleeve is provided with an operation work receiving opening 1221, and the opening direction of the operation work receiving opening 1221 faces the convex teeth 123. The above-described operation work accommodating port 1221 is simple in structure and easy to set. Meanwhile, in the technical scheme of this embodiment, the driving member 121 is driven to rotate by a dedicated bevel gear, and the bevel gear is inserted into the operation receiving opening 1221 and then rotated, so that the driving member 121 can be driven to rotate, that is, the driving member 121 can be moved up and down.

In order to facilitate the connection of the first and second end plates to the body structure, as shown in fig. 1 to 4, in the present embodiment, a first clamping structure 40 is provided between the sleeve and the first end plate 20, and a second clamping structure 50 is provided between the second end plate 30 and the first body portion 11. The first and

second clamping structures

40, 50 described above are simple in construction, easy to set, and capable of effectively securing the first and

second endplates

20, 30, and facilitating removal and replacement of the first and

second endplates

20, 30.

As shown in fig. 1 to 4, in the present embodiment, the first clamping structure 40 includes two, the two first clamping structures 40 are disposed opposite to each other, and the second clamping structure 50 includes two, the two second clamping structures 50 are disposed opposite to each other. The arrangement described above can effectively ensure the connection between the first end plate 20 and the second end plate 30, and prevent them from being separated.

As shown in fig. 1 to 5, in this embodiment, the first engaging structure 40 includes a groove 41 disposed at an end of the sleeve away from the driving member 121, a first engaging platform 411 is disposed in the groove 41, the first engaging structure 40 further includes a first connecting arm 42 connected to the first end plate 20, a first buckle 421 is disposed on the first connecting arm 42, at least a portion of the first connecting arm 42 is disposed in the groove 41, and the first engaging platform 411 and the first buckle 421 are engaged with each other. The first body portion 11 further includes a connecting seat 111, the second clamping structure 50 includes a convex portion 51 disposed on a side wall of the connecting seat 111, a second clamping platform 511 is disposed on the convex portion 51, the second clamping structure 50 further includes a second connecting arm 52 connected to the second end plate 30, a second buckle 521 is disposed on the second connecting arm 52, and the second clamping platform 511 and the second buckle 521 are in clamping fit. The arrangement described above can effectively ensure the connection effect and prevent the first end plate 20 and the second end plate 30 from falling off. Thereby indirectly ensuring the using effect of the vertebral body prosthesis.

As shown in fig. 1 to 3, in the present embodiment, a plurality of first through holes are provided on the sleeve, a plurality of second through holes are provided on the first main body portion 11, a first through hole is provided on the first end plate 20, a second through hole is provided on the second end plate 30, a third through hole is provided on the first main body portion 11, an extending direction of the third through hole is parallel to a length direction of the first main body portion 11, and the first through hole, the second through hole, and the third through hole are communicated with each other. Foretell first through hole, second through hole and third through hole form the bone grafting storehouse jointly, implant the back with centrum prosthesis, pack autogenous bone or xenogenous bone in the bone grafting storehouse, can make human bone structure grow into to the bone grafting storehouse in like this, and then realize biological fixed.

In the description of the present invention, it is to be understood that the orientation or positional relationship indicated by the orientation words such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom", etc. are usually based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and in the case of not making a reverse description, these orientation words do not indicate and imply that the device or element being referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore, should not be considered as limiting the scope of the present invention; the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.

Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

It should be noted that the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and the terms have no special meanings unless otherwise stated, and therefore, the scope of the present invention should not be construed as being limited.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A vertebral prosthesis, comprising:

a body structure (10);

a plurality of first endplates (20) replaceably connected to a first end of the body structure (10);

a plurality of second endplates (30) replaceably connected to a second end of the body structure (10);

wherein the height of the body structure (10) is adjustably arranged to vary the distance between the first endplate (20) and the second endplate (30).

2. Vertebral body prosthesis according to claim 1, characterized in that said body structure (10) comprises a first body part (11) and a second body part (12), said second body part (12) being arranged on said first body part (11), said second body part (12) moving up and down along the axis of said first body part (11).

3. The vertebral prosthesis of claim 2 wherein the second body portion (12) includes a driver (121) and a support (122), the driver (121) and the support (122) being in driving engagement, the support (122) being located between the driver (121) and the first endplate (20).

4. The vertebral prosthesis according to claim 3, characterized in that said first body portion (11) comprises an external thread, said driving member (121) comprises an internal thread, said support member (122) comprises a sleeve, said external thread and said internal thread being in threaded engagement, said first endplate (20) being detachably connected to said sleeve.

5. Vertebral body prosthesis according to claim 4, characterized in that the upper surface of the driver (121) is provided with a bevel decreasing from the proximity of the first body portion (11) to the distance from the first body portion (11), said bevel being provided with a plurality of teeth (123) at intervals.

6. Vertebral prosthesis according to claim 5, characterized in that said sleeve is provided with an operative reception opening (1221), said operative reception opening (1221) opening in a direction towards said teeth (123).

7. Vertebral prosthesis according to claim 4, characterized in that a first snap-in structure (40) is provided between the sleeve and the first end plate (20), and a second snap-in structure (50) is provided between the second end plate (30) and the first body portion (11).

8. Vertebral prosthesis according to claim 7, characterized in that said first clamping structure (40) comprises two, two first clamping structures (40) being arranged opposite each other and said second clamping structure (50) comprises two, two second clamping structures (50) being arranged opposite each other.

9. The vertebral prosthesis according to claim 7, characterized in that the first clamping structure (40) comprises a groove (41) provided at an end of the sleeve remote from the driving member (121), a first clamping platform (411) is provided in the groove (41), the first clamping structure (40) further comprises a first connecting arm (42) connected with the first end plate (20), a first buckle (421) is provided on the first connecting arm (42), at least a part of the first connecting arm (42) is located in the groove (41), and the first clamping platform (411) and the first buckle (421) are in clamping fit.

10. The vertebral prosthesis according to claim 7, wherein the first body portion (11) further comprises a connecting seat (111), the second clamping structure (50) comprises a convex portion (51) arranged on a side wall of the connecting seat (111), a second clamping platform (511) is arranged on the convex portion (51), the second clamping structure (50) further comprises a second connecting arm (52) connected with the second end plate (30), a second buckle (521) is arranged on the second connecting arm (52), and the second clamping platform (511) and the second buckle (521) are in clamping fit.