CN215606599U - Femoral prosthesis - Google Patents

Abstract

The utility model relates to a femoral prosthesis, which belongs to the technical field of orthopedic implants and comprises an inner ankle part and an outer ankle part, wherein the inner surfaces of the inner ankle part and the outer ankle part are provided with contact surfaces for accommodating a bone bed after osteotomy, two sides of the inner ankle part and the outer ankle part are bent upwards to form a C-shaped structure, the two sides of the contact surfaces of the inner ankle part and the outer ankle part are both of open structures, the outer sides of the open structures are respectively provided with a fixing part which extends outwards along the oblique upper direction, and one side of the fixing part, which faces to the bone bed of a femur, is provided with a plurality of transverse grooves; the micro-motion between the femoral prosthesis and the bone bed after osteotomy can be effectively eliminated, the abrasion is reduced, the femoral prosthesis is not easy to deform, and the service life of the prosthesis can be effectively prolonged.

Description

Femoral prosthesis

Technical Field

The utility model relates to the technical field of orthopedic implants, in particular to a femoral prosthesis.

Background

The knee joint replacement is that metal, high molecular polyethylene, ceramic and other materials are adopted to prepare an artificial joint prosthesis according to the shape, structure and function of a human joint, and the artificial joint prosthesis is implanted into a human body through a surgical technology to replace a diseased joint surface of the knee joint, so that the aims of relieving joint pain and recovering joint function are fulfilled.

Generally have the thighbone prosthesis of a series of different specification models in the hospital, the doctor can select suitable thighbone prosthesis from thighbone prosthesis system according to different patients ' thighbone size to guarantee that the knee joint prosthesis after the replacement can be close patient's native knee joint by furthest, and then improve patient's postoperative experience.

Various femoral prostheses are disclosed in the prior art, for example, chinese patent CN107280817A discloses a medial femoral unicondylar prosthesis, a lateral femoral unicondylar prosthesis, and a femoral trochlear prosthesis. The medial femoral unicondylar prosthesis comprises: the articular surface is a surface which is contacted with the inner side of the patella and the inner side of the tibial plateau in the knee joint movement process, and is represented as an arc segment on a first ellipse in the sagittal position and represented as an arc segment on a first circle in the coronal position; and a medial side, which is the portion of the prosthesis adjacent to the resected femoral condyle surface and the bone cement after placement, and which is represented by a linear cross-sectional medial posterior condyle and a medial distal portion that is coincident with the articular surface segment. By adopting the structure, the geometry of the condyle of the femur of a normal human body can be closer, and the design parameter values of femoral prostheses of different types are simplified.

For another example, chinese utility model patent CN209269991U provides a femoral condyle prosthesis and tibial pad prosthesis assembly. The femoral condyle prosthesis has an anterior condyle and a posterior condyle in one piece. The posterior condyle comprises a left posterior condyle, a right posterior condyle and an intercondylar notch positioned between the left posterior condyle and the right posterior condyle, and the middle of the upper part of the tibial pad prosthesis is provided with a limiting column. Two sides of the upper part of the tibial pad prosthesis are provided with two pad concave surfaces, wherein the left posterior condyle and the right posterior condyle are respectively contacted with the two pad concave surfaces. The left posterior condyle, the right posterior condyle and the concave surface of the gasket are arranged as follows: for a plurality of femur condyle prostheses and tibia pad prostheses with different sizes and specifications, the femur condyle prostheses can be matched with tibia pad prostheses with various specifications, and the femur condyle prostheses and the tibia pad prostheses with corresponding specifications can be selected according to the actual condition of a patient.

The research shows that the femoral prosthesis in the prior art has the following defects:

1. theoretically, the inner ankle part and the outer ankle part of the femoral prosthesis should be designed into a semi-closed shape so as to wrap the inner ankle part and the outer ankle part of the femur to achieve a better fixing effect, but the design needs to be specially customized according to the shape of the femur of each patient, so that the cost of the prosthesis is obviously increased, and large-scale application is difficult to obtain; the existing prosthesis is generally designed into a shape with two side openings, so that the types of prosthesis models can be reduced in the production process, and the prosthesis with one model can be adapted to femurs with different sizes in a certain range, so that the prosthesis can be modularized in production, and the use cost is greatly reduced; however, by adopting the structure with openings at two sides, in the process of movement, the stress in the vertical direction of the central connecting line of the medial malleolus and the lateral malleolus can be well fixed, but when the stress is stimulated by larger stress parallel to the central connecting line, the stress is difficult to be completely counteracted only by the action of the fixing column, so that the service life of the prosthesis is shortened, and the femur is easily injured by the impact of the fixing column in serious cases;

2. the one side of prosthesis internal surface and thighbone contact because patient's thighbone shape difference leads to prosthesis and thighbone contact surface to have the gap, adopts the mode of pouring into bone cement among the prior art to fix more, nevertheless because the contact surface is more smooth, leads to fixed effect not good.

There is therefore a need for an improved femoral prosthesis structure that addresses the problems of the prior art.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a femoral prosthesis to solve the defects in the prior art.

The technical scheme for solving the technical problems is as follows:

the femoral prosthesis comprises an inner ankle part and an outer ankle part, wherein the inner surfaces of the inner ankle part and the outer ankle part are provided with contact surfaces for accommodating a bone bed after osteotomy, the two sides of the inner ankle part and the two sides of the outer ankle part are bent upwards to form a C-shaped structure, the two sides of the contact surfaces of the inner ankle part and the outer ankle part are both of an open structure, the outer sides of the open structures are respectively provided with a fixing part which extends outwards along the oblique upper direction, and one side of the fixing part, facing the bone bed of the femur, is provided with a plurality of transverse grooves;

furthermore, an ankle reinforcing plate is arranged between the inner sides of the medial ankle part and the lateral ankle part of the femoral prosthesis;

furthermore, reinforcing ribs are arranged on the inner sides of the inner ankle part and the outer ankle part of the femoral prosthesis, and the reinforcing ribs extend to the inter-ankle reinforcing plate;

furthermore, the inner surface of the femoral prosthesis is provided with a first plane, a second plane and a third plane, the first plane, the second plane and the third plane form a contact surface connected with a bone bed on the inner surface of the prosthesis, the first plane, the second plane and the third plane are respectively provided with a plurality of raised circular grooves for containing bone cement for fixation, and the centers of the circular grooves are provided with circular holes entering the inner surface of the prosthesis;

furthermore, a vertically arranged fixing column is arranged on the contact surface;

furthermore, the fixing column is of a hollow structure, and holes are formed in the two sides of the lower end of the fixing column and the top end of the fixing column and communicated with the hollow structure;

the utility model has the beneficial effects that: the micro-motion between the femoral prosthesis and the bone bed after osteotomy can be effectively eliminated, the abrasion is reduced, the femoral prosthesis is not easy to deform, and the service life of the prosthesis can be effectively prolonged.

Drawings

FIG. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a schematic side view of the cross-sectional structure of the present invention;

FIG. 3 is a schematic top view of the present invention;

Detailed Description

The principles and features of this invention are described below in conjunction with the following drawings, which are set forth by way of illustration only and are not intended to limit the scope of the utility model.

The femoral prosthesis according to the present invention is intended to be implanted in a patient to replace the distal femur of the resected diseased knee joint of the patient, thereby achieving knee joint function as the distal femur of the knee joint of the patient in everyday life. As shown in fig. 1, the femoral prosthesis comprises an internal ankle part 1 and an external ankle part 2, wherein the internal surfaces of the internal ankle part 1 and the external ankle part 2 are provided with contact surfaces for accommodating a bone bed after osteotomy, two sides of the internal ankle part 1 and the external ankle part 2 are bent upwards to form a C-shaped structure in cross section, two sides of the contact surfaces of the internal ankle part 1 and the external ankle part 2 are both of an open structure, the outer sides of the open structures are respectively provided with a fixing part 3 extending outwards along an oblique upper direction, and one side of the fixing part 3 facing the bone bed of the femur is provided with a plurality of transverse grooves 31;

according to above-mentioned technical scheme, during the implementation, can select the femoral prosthesis of corresponding model according to the bone bed size that the patient cut the bone, and owing to be provided with outside extension fixed part, receive in the patient motion process with ankle joint and ankle joint center line vertical direction's stress, can carry on spacingly to the thighbone, prevent the displacement between thighbone and the prosthesis, reduce wearing and tearing between the two to effectively prolong femoral prosthesis's life.

The transverse groove can increase the contact area of the prosthesis and the bone bed and enhance the stability when being fixed by bone cement.

As a further improvement of the above technical solution, an intercondylar reinforcement plate 4 is provided between the medial sides of the medial malleolus 1 and the lateral malleolus 2 of the femoral prosthesis; the impact resistance of the upper end part of the outer side of the femoral prosthesis can be improved, the deformation of the femoral prosthesis in the using process is reduced, and the abrasion is further reduced.

More specifically, as shown in fig. 2-3, the medial malleolus 1 and lateral malleolus 2 of the femoral prosthesis are provided with reinforcing ribs 5 on their inner sides, the reinforcing ribs 5 extending to the intercondylar reinforcing plate 4; the structure can further enhance the overall strength and the wrapping property of the femoral prosthesis.

As a further improvement of the above technical solution, the inner surface of the femoral prosthesis has a first plane 6, a second plane 7 and a third plane 8, the first plane 6, the second plane 7 and the third plane 8 form a contact surface of the inner surface of the prosthesis, which is in contact with a bone bed, and a plurality of raised circular grooves 9 for accommodating bone cement for fixation are arranged on each of the first plane 6, the second plane 7 and the third plane 8, and a circular hole 10 entering the inner surface of the prosthesis is arranged in the center of each circular groove 9;

the femoral prosthesis is found in the treatment process, the inner surface of the currently used femoral prosthesis is provided with an arc-shaped structure, the structure has the defect that the contact surface of the femoral prosthesis and the femoral bone bed is difficult to achieve a good fixing effect, the contact surface with the first plane, the second plane and the third plane is adopted, the effect of clamping and fixing the femoral bed can be achieved to a certain extent, meanwhile, the cross section of the femoral bed matched with each plane has certain roughness, when the femoral prosthesis is in contact with each plane, the friction force of each contacted plane is improved due to the matching of the circular grooves, the femoral prosthesis is fixed by bone cement, the circular grooves and the circular holes play a role in increasing the contact area of the femoral prosthesis and the femoral bed, the micro motion between the prosthesis and the femur can be thoroughly eliminated, and a better fixing effect is achieved.

As a further improvement of the above technical solution, the contact surface is provided with a vertically arranged fixing column 11;

more specifically, the fixing column 11 is a hollow structure, and both sides of the lower end of the fixing column 11 and the top end of the fixing column 11 are provided with holes 12 communicated with the hollow structure;

according to the technical scheme, the structure of the fixing column can provide bone ingrowth capability, so that host bones can grow into the fixing column, and better stability is achieved.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the utility model, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims (6)

1. A femoral prosthesis, characterized by: including interior ankle part and lateral malleolus portion, the internal surface of interior ankle part and lateral malleolus portion has the contact surface of the bone bed after the holding osteotomy, interior ankle part and lateral malleolus portion both sides kickup constitute the cross-section and be "C" type structure, the both sides of the contact surface of interior ankle part and lateral malleolus portion are open structure, open structure's the outside respectively is provided with a fixed part that extends along oblique top outward, the fixed part has a plurality of horizontal recesses towards femoral bone bed one side.

2. The femoral prosthesis of claim 1, wherein: an intercondylar reinforcing plate is arranged between the inner sides of the medial malleolus and the lateral malleolus of the femoral prosthesis.

3. The femoral prosthesis of claim 2, wherein: reinforcing ribs are arranged on the inner sides of the inner ankle part and the outer ankle part of the femoral prosthesis and extend to the ankle reinforcing plate.

4. The femoral prosthesis of any of claims 1-3, wherein: the inner surface of the femoral prosthesis is provided with a first plane, a second plane and a third plane, the first plane, the second plane and the third plane form a contact surface connected with a bone bed on the inner surface of the prosthesis, a plurality of raised circular grooves used for containing bone cement for fixation are arranged on the first plane, the second plane and the third plane, and a circular hole entering the inner surface of the prosthesis is formed in the center of each circular groove.

5. The femoral prosthesis of claim 4, wherein: and the contact surface is provided with a vertically arranged fixing column.

6. The femoral prosthesis of claim 5, wherein: the fixing column is of a hollow structure, and holes are formed in the two sides of the lower end of the fixing column and the top end of the fixing column and communicated with the hollow structure.

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