阅读说明：本技术 一种用于踝关节的锁定型假体 (Locking type prosthesis for ankle joint ) 是由 朱海阔 史春宝 郭静 王振国 朱更博 于 2021-08-30 设计创作，主要内容包括：本发明提供了一种用于踝关节的锁定型假体,包括：胫骨托本体,其上设有用于同胫骨端固定连接的圆锥体,以及与所述圆锥体对应设置的锥柱,且所述锥柱与所述圆锥体在所述胫骨托本体的位置相反；胫骨衬垫,其上开设有与所述锥柱适配的锥配孔,用于所述锥柱插入所述锥配孔后将所述胫骨托本体与所述胫骨衬垫连接。其优点是：该假体的结构可与距骨顶假体连接后在踝关节置换假体术中使用,连接方便,可在保证胫骨托本体、胫骨衬垫结合稳定的同时为后期翻修提供更多可能；而胫骨衬垫下端采用适配仿生距骨头圆弧的曲面设计,保证假体原生性的同时,可更好地模仿踝关节运动。(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.)

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).

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 the content of the first and second substances,

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

The tibia pad 2 is provided with a taper matching hole 21 matched with the taper column 12, and the taper column 12 is used for connecting the tibia support body 1 and the tibia pad 2 after being inserted into the taper matching hole 21. The end with the larger outer diameter of the conical column 12 is abutted against the tibial tray body 1 to improve the stability of the tibial tray body 1 and the tibial gasket 2.

The technical scheme is realized as follows: the tibia support body 1 and the tibia liner 2 are in taper fit, namely, the taper column 12 is inserted into the corresponding taper matching hole 21 on the tibia liner 2, and then the combined tibia support body 1 and the tibia liner 2 are fixed on the tibia side, and the fixing mode can ensure that the tibia support body 1 and the tibia liner 2 are stably and firmly combined and provide more possibilities for later repair, specifically, the tip of the taper body 11 on the tibia 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, three cones 11 are provided and arranged in a triangular shape on the tibia tray body 1; in order to improve the firmness and avoid stress concentration, the three cones 1 are arranged on the tibial tray body 1 in an isosceles triangle shape;

in a specific implementation process, the tibial tray body 1 comprises a transverse plate 13 and a longitudinal plate 14 which are integrally formed, the cone 11 and the conical column 12 are both arranged on the transverse plate 13 and are parallel to the longitudinal 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 the transverse plate 13, and two bottom angles of the isosceles triangle are located at one side close 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, and the transverse plate 13 and the longitudinal 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 three cones 11 is coincident with the central line of the transverse plate 13. In the implementation process, the fixing is performed on the tibia side through the cones 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 through holes 15.

Because the cones 11 correspond to the cone columns 12 one by one, three cone columns 12 are also arranged on the transverse plate 13 and on the side away from the cones 11, so that the tibia pad 2 is connected to the lower end surface of the transverse plate 13 through the cone columns 12; the cone 11 and the cone 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 threaded holes 15 opened in the longitudinal plate 14 is preferably 2, and the threaded holes will be arranged at equal intervals along the width direction of the longitudinal plate 14 to enhance the stability of the prosthesis.

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

In a specific embodiment, in order to enhance the firmness, the surface of the longitudinal plate 14 facing the cone 11 is a cambered surface matched with the tibia; deviating from on the shin bone liner 2 one side of shin bone 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.