CN113693792A - Locking type prosthesis for ankle joint - Google Patents

Abstract

The present invention provides a locking type prosthesis for an ankle joint, comprising: the tibia support body is provided with a cone fixedly connected with a tibia end and a conical column arranged corresponding to the cone, and the positions of the conical column and the cone on the tibia support body are opposite; the tibia liner is provided with a taper matching hole matched with the taper column, and the tibia liner is used for connecting the tibia support body with the tibia liner after the taper column is inserted into the taper matching hole. The advantages are that: the structure of the artificial body can be used in the ankle joint replacement prosthesis operation after being connected with the talus crest artificial body, the connection is convenient, and more possibilities are provided for later revision while the combination stability of the tibial tray body and the tibial gasket is ensured; and the curved surface design of the bionical talar head circular arc of adaptation is adopted to shin bone liner lower extreme, when guaranteeing the prothesis proticity, can imitate ankle joint motion better.

Description

Locking type prosthesis for ankle joint

Technical Field

The invention relates to the technical field of medical treatment, in particular to a locking type prosthesis for an ankle joint.

Background

In the existing ankle joint replacement surgery, most of the fixing modes of the used replacement prosthesis on the tibia side adopt a tibia handle fixing mode, for example, an INBONE II ankle joint replacement prosthesis, and the fixing mode on the tibia side is commonly used in the market: the fixing mode is performed by using the tibial stem, and although the fixing mode can play a role in fixing, the stability is poor, the operation is complex, and the operation effect is general. Meanwhile, the combination of the tibia support and the pad mostly adopts a dovetail type combination mode and is locked by a reverse bevel angle. Although the combination mode is stable, the installation is complex, and the later repair is difficult. Therefore, the tibia is required to be designed to be fixed and stable, the installation is convenient and fast, the revision is simple, and the replacement prosthesis accords with the ankle joint of China.

Disclosure of Invention

The present invention provides a locking type prosthesis for an ankle joint such that the amount of osteotomy is reduced while the stability thereof is increased during use of the ankle joint prosthesis.

A locking prosthesis for an ankle joint, comprising:

the tibia support body is provided with a cone and a conical column which is arranged corresponding to the cone, and the positions of the conical column and the cone on the tibia support body are opposite;

the tibia liner is provided with a taper matching hole matched with the taper column, and the tibia liner is used for connecting the tibia support body with the tibia liner after the taper column is inserted into the taper matching hole.

Preferably, the number of the cones is three, and the cones are arranged on the tibia support body in a triangular mode.

Further, the three cones are arranged on the tibial tray body in an isosceles triangle shape.

Furthermore, the tibia support body comprises a transverse plate and a longitudinal plate which are integrally formed, and the cone and the conical column are both arranged on the transverse plate and are parallel to the longitudinal plate;

the longitudinal plate is provided with a threaded through hole in the same direction as the transverse plate; the transverse plate and the longitudinal plate form an L shape.

Furthermore, the surface of the longitudinal plate, which faces the cone, is a cambered surface matched with the tibia.

Preferably, the side of the tibial insert facing away from the tibial tray body is adapted to fit a biomimetic talus head.

Preferably, the center line of a triangle formed by three cones is coincident with the center line of the transverse plate.

The invention relates to a locking type prosthesis for an ankle joint, which has the advantages that: in the structure, the triangular cone structure design on the tibial tray body is matched with the threaded through hole, so that the tibial tray body is stably connected with the tibial end, the bone cutting amount is reduced, and the operation efficiency is improved;

moreover, the corresponding design of the cone and the conical column on the tibial tray body ensures that the central line formed by the cones is parallel to the central line formed by the conical columns, so that the prosthesis is implanted more firmly after the tibial tray body is connected with the tibial gasket, otherwise, the stress is easily concentrated to cause dislocation, and finally, the implantation firmness of the prosthesis is poor;

finally, the structure of the artificial body can be used in the ankle joint replacement prosthesis operation after being connected with the talus crest artificial body, the connection is convenient, and more possibilities are provided for later repair while the combination stability of the tibial tray body and the tibial gasket is ensured; and the curved surface design of the bionical talar head circular arc of adaptation is adopted to shin bone liner lower extreme, when guaranteeing the prothesis proticity, can imitate ankle joint motion better.

Drawings

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

FIGS. 1 and 2 are schematic perspective views of a locking type prosthesis for an ankle joint according to the present invention from different perspectives, respectively;

fig. 3-6 are schematic perspective views of the tibial tray body of the present invention from different viewing angles;

fig. 7 and 8 are schematic perspective views of the tibial gasket from different viewing angles, respectively;

wherein,

1-a tibia support body, 11-a cone, 12-a cone column, 13-a transverse plate, 14-a longitudinal plate, 15-a threaded through hole, 2-a tibia liner and 21-a cone matching hole.

Detailed Description

The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are described herein for the purpose of illustration and explanation and not limitation.

In order to overcome the technical problems of poor stability and inconvenient revision in the prior art ankle joint prosthesis, the present invention provides a locking type prosthesis for an ankle joint, as shown in fig. 1 to 8, comprising:

the tibia support comprises atibia support body 1, acone 11 and aconical column 12, wherein thecone 11 is fixedly connected with a tibia end, theconical column 12 is arranged corresponding to thecone 11, and the positions of theconical column 12 and thecone 11 on thetibia support body 1 are opposite; thetibia support body 1 is designed to be of an integrated structure, so that operation steps are reduced, and operation efficiency is improved.

Thetibia pad 2 is provided with ataper matching hole 21 matched with thetaper column 12, and thetaper column 12 is used for connecting thetibia support body 1 and thetibia pad 2 after being inserted into thetaper matching hole 21. The end with the larger outer diameter of theconical column 12 is abutted against thetibial tray body 1 to improve the stability of thetibial tray body 1 and thetibial gasket 2.

The technical scheme is realized as follows: thetibia support body 1 and thetibia liner 2 are in taper fit, namely, thetaper column 12 is inserted into the correspondingtaper matching hole 21 on thetibia liner 2, and then the combinedtibia support body 1 and thetibia liner 2 are fixed on the tibia side, and the fixing mode can ensure that thetibia support body 1 and thetibia liner 2 are stably and firmly combined and provide more possibilities for later repair, specifically, the tip of thetaper body 11 on thetibia support body 1 is inserted into the tibia side for fixing.

In a specific embodiment, in order to reduce the amount of osteotomy and more stably fix the tibia end and reduce the number of surgical operation steps, threecones 11 are provided and arranged in a triangular shape on thetibia tray body 1; in order to improve the firmness and avoid stress concentration, the threecones 1 are arranged on thetibial tray body 1 in an isosceles triangle shape;

in a specific implementation process, thetibial tray body 1 comprises atransverse plate 13 and alongitudinal plate 14 which are integrally formed, thecone 11 and theconical column 12 are both arranged on thetransverse plate 13 and are parallel to thelongitudinal plate 14, the length of the middle waist side of the isosceles triangle is smaller than that of the bottom side, so that a bisector of the middle vertex angle of the isosceles triangle coincides with the central line of thetransverse plate 13, and two bottom angles of the isosceles triangle are located at one side close to thelongitudinal plate 14, wherein thelongitudinal plate 14 is provided with a threaded throughhole 15 in the same direction as thetransverse plate 13, and thetransverse plate 13 and thelongitudinal plate 14 form an L shape, so that the tibial tray platform can fix the tibial end in the transverse direction and the longitudinal direction at the same time, so that the firmness of the tibial tray platform is improved, and the amount of bone truncation can be effectively reduced; the central line of the triangle formed by the threecones 11 is coincident with the central line of thetransverse plate 13. In the implementation process, the fixing is performed on the tibia side through thecones 11 arranged in a triangle, and then the fixing is performed on the front section of the tibia support body through the locking screws rotating through the threaded throughholes 15.

Because thecones 11 correspond to thecone columns 12 one by one, threecone columns 12 are also arranged on thetransverse plate 13 and on the side away from thecones 11, so that thetibia pad 2 is connected to the lower end surface of thetransverse plate 13 through thecone columns 12; thecone 11 and thecone column 12 are arranged in a one-to-one correspondence manner, so that the prosthesis is firmer after being implanted, and stress concentration, dislocation and insecurity are avoided.

The number of the threadedholes 15 opened in thelongitudinal plate 14 is preferably 2, and the threaded holes will be arranged at equal intervals along the width direction of thelongitudinal plate 14 to enhance the stability of the prosthesis.

In a specific implementation process, in an isosceles triangle formed by the threeconical columns 12, the outer diameters of theconical columns 12 located on the top corners are larger than the outer diameters of theconical columns 12 located on the two bottom corners, so that the firmness is enhanced, correspondingly, the number of theconical matching holes 21 is three, and the size of the threeconical matching holes 21 corresponds to the size of the threeconical columns 12, so that theconical columns 12 are matched with theconical matching holes 21.

In a specific embodiment, in order to enhance the firmness, the surface of thelongitudinal plate 14 facing thecone 11 is a cambered surface matched with the tibia; deviating from on theshin bone liner 2 one side of shinbone support body 1 is used for with bionical talar head adaptation, has guaranteed the primitive nature of false body, imitates ankle joint motion better.

The prosthesis structure design protected by the invention effectively simplifies the operation process, reduces the burden and the bone cutting amount of a patient, and improves the stability of prosthesis implantation.

In the present invention, the figures that are not explicitly described or drawn are conventional techniques, and thus are not described in detail. Further, the present invention is limited in terms of orientation (e.g., left, right, front, rear, up, down, etc.) as viewed in the drawings.

It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims (7)

1. A locking prosthesis for an ankle joint, comprising:

the tibia support body (1) is provided with a cone (11) and a conical column (12) which is arranged corresponding to the cone (11), and the position of the conical column (12) and the position of the cone (11) on the tibia support body (1) are opposite;

the tibia pad (2) is provided with a conical matching hole (21) matched with the conical column (12), and the tibia pad (2) is used for connecting the tibia support body (1) with the tibia pad (2) after the conical column (12) is inserted into the conical matching hole (21).

2. A locking prosthesis for an ankle joint according to claim 1, wherein: the number of the cones (11) is three, and the tibia support body (1) is arranged in a triangular mode.

3. A locking prosthesis for an ankle joint according to claim 2, wherein: the three cones (11) are arranged on the tibia support body (1) in an isosceles triangle shape.

4. A locking prosthesis for an ankle joint according to claim 3, wherein: the tibia support body (1) comprises a transverse plate (13) and a longitudinal plate (14) which are integrally formed, and the cone body (11) and the cone column (12) are both arranged on the transverse plate (13) and are parallel to the longitudinal plate (14);

wherein the longitudinal plate (14) is provided with a threaded through hole (15) in the same direction as the transverse plate (13); the transverse plate (13) and the longitudinal plate (14) form an L shape.

5. A locking prosthesis for an ankle joint according to claim 4, wherein: the surface of the longitudinal plate (14) facing the cone (11) is a cambered surface matched with the tibia.

6. A locking prosthesis for an ankle joint according to claim 1, wherein: one side of the tibia liner (2) departing from the tibia support body (1) is used for being matched with the bionic talus head.

7. A locking prosthesis for an ankle joint according to claim 3, wherein: the center line of a triangle formed by the three cones (11) is superposed with the center line of the transverse plate (13).

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