CN219480478U

CN219480478U - Personalized customization knee joint femoral prosthesis

Info

Publication number: CN219480478U
Application number: CN202223427164.1U
Authority: CN
Inventors: 刘聪研; 岳术俊; 王俐慧; 许奎雪; 史春生
Original assignee: Beijing Chunlizhengda Medical Instruments Co Ltd
Current assignee: Beijing Chunlizhengda Medical Instruments Co Ltd
Priority date: 2022-12-21
Filing date: 2022-12-21
Publication date: 2023-08-08
Anticipated expiration: 2032-12-21

Abstract

The utility model discloses a personalized customized knee joint femur prosthesis, and belongs to the technical field of artificial prostheses. The bone marrow fixing device comprises a main body part, wherein a fixing column for connecting a femoral bone marrow needle or an osteotomy segment is arranged at the top of the main body part; the bottom surface of the main body part is provided with a fixing cone for enhancing the initial connection stability with the rest bone condyle; the bottom surface of the main body is also provided with a bone trabecula layer; bone trabecular hole porosity of the bone trabecular layer: 50% -80%, bone small Liang Kongjing: 200 um-800 um, bone small Liang Sijing: 300um to 700um. The utility model reserves the joint surface of the distal femur, ensures the original flexibility of the joint of the patient, and improves the life quality of the patient.

Description

Personalized customization knee joint femoral prosthesis

Technical Field

The utility model relates to the technical field of artificial prostheses, in particular to a personalized customized knee joint femur prosthesis.

Background

Knee arthroplasty typically has four components: a femoral component, a tibial tray, a tibial insert, and a patella component. During operation, the pathological changes of the knee joint surfaces of the femur, the tibia and the patella are sequentially resected, and an artificial knee joint part is installed.

The outer side of the existing femur component is a full polished surface and simulates the anatomical structure of a human knee joint. The inner side is typically 5 faces. During operation, the femur is cut into 5 faces by using the locating tool and the saw blade, the bone is cut symmetrically at the inner side and the outer side, and then the bone cutting component is driven into the distal end of the femur. All 5 cross-sections are flat in the medial-lateral direction because the medial 5 faces of the femoral component are flat in the medial-lateral direction. The design of the femoral component facilitates product production but increases osteotomy size. Bone retention is always an important index in knee joint surgery, affecting the stability, mobility and life of the joint after knee joint surgery. Meanwhile, more bone cutting amount brings difficulty to knee joint revision surgery in future.

1. The prior art prosthesis has the problem of bone preservation, which is unfavorable for the stability of the prosthesis.

2. The prior art prosthesis has the problem of stress concentration, which is unfavorable for the stability of the prosthesis.

3. The prior art prosthesis has the problem of less bone nails, which is unfavorable for the initial stabilization of the prosthesis.

4. The prior art has the problem of poor bone fracture, which is unfavorable for the long-term stability of the prosthesis.

Disclosure of Invention

The utility model aims to solve the technical defects in the background art, and therefore, the utility model provides a personalized customized knee joint femur prosthesis.

In order to achieve the above object, the present utility model is specifically as follows:

a personalized customized knee joint femoral prosthesis, which comprises a main body part, wherein the top of the main body part is provided with a fixing column for connecting a femoral intramedullary pin or an osteotomy segment; the bottom surface of the main body part is provided with a fixing cone for enhancing the initial connection stability with the rest bone condyle; the bottom surface of the main body is also provided with a bone trabecula layer; bone trabecular hole porosity of the bone trabecular layer: 50% -80%, bone small Liang Kongjing: 200 um-800 um, bone small Liang Sijing: 300um to 700um.

Further, the thickness of the bone trabecular layer is 3mm.

Further, the trabecular bone layer adapts to the physiological curvature of the epiphysis.

Compared with the prior art, the scheme has the following beneficial effects:

1. the prior art does not consider the position of the tumor, and the structure peels off the epiphyseal surface design according to the fact that the tumor is very close to the epiphysis, so that the epiphysis is reserved, and the subsequent physical development of a patient is not influenced.

2. The prior art prosthesis can cause inconvenient life recovery after operation of a patient, and the structure adopts the function of reserving the joint surface of the distal femur, so that the joint of the patient can ensure the original flexibility and the life quality of the patient can be improved.

3. The prior art does not consider the initial stability of the prosthesis, the structure adopts 8 small-synapses to stab the residual bone condyles for connection, and the initial stability of the prosthesis is enhanced by adopting distributed distribution.

4. In the prior art, healthy bones are resected too much, the structure reserves the joint surface of the distal femur, and the excessive healthy bones of a patient are avoided from being resected during operation.

5. The bone trabecula structure of prior art 3D printing bone trabecula structure bone is gone into later stage stability not good, and this structure adopts bone trabecula structure aperture 200um ~ 800um with bone condyle direct contact position, and the purpose is in order to reach better bone and is gone into the effect.

Drawings

Fig. 1 is a schematic structural diagram of an embodiment of the present utility model.

Fig. 2 is a schematic diagram of a part of the structure of an embodiment of the present utility model.

In the figure: 1. fixing columns, fixing cones, bone trabecula layers, 3 and solid parts.

Detailed Description

The embodiments described below by referring to the drawings are illustrative and intended to explain the present utility model and should not be construed as limiting the utility model.

Further, the thickness of the bone trabecular layer is 3mm.

The following is a more specific example:

referring to fig. 1 and 2, the personalized customized knee prosthesis of the present embodiment aims to preserve the femoral condyle and epiphyseal line, so that the patient's condyle maintains the original degree of freedom. The prosthesis material is titanium alloy, a 3D printing technology and an additive manufacturing process are adopted, and the prosthesis conforming to biological characteristics is designed according to the specific condition of a patient, so that benign adaptation of the prosthesis and bone is realized. The femur prosthesis consists of two parts, namely a solid part and a bone trabecular layer; the femoral prosthesis is connected with the bone condyles through the fixing cones, the fixing columns at the upper end of the femoral prosthesis can be connected with prosthesis components such as different femoral intramedullary nails, bone cutting segments and the like according to actual conditions of patients, the fixing cones at the bottom of the femoral prosthesis strengthen initial connection stability of the prosthesis and the rest bone condyles, 3mm trabecular parts at the bottom are designed according to physiological radians of epiphysis, stability is further improved, and bone growth can be facilitated by the trabecular layers, so that the femoral prosthesis is convenient to use for a long time. Bone trabecular pore porosity: 50% -80%, bone small Liang Kongjing: 200 um-800 um, bone small Liang Sijing: 300um to 700um. The prosthesis can complement defective bones and avoid unstable behaviors of the prosthesis. The outside anatomic steel plates are fixed, further increasing the stability of the prosthesis.

Claims

1. A personalized customized knee joint femoral prosthesis, comprising a main body part, wherein the top of the main body part is provided with a fixing column for connecting a femoral intramedullary pin or an osteotomy segment; the bottom surface of the main body part is provided with a fixing cone for enhancing the initial connection stability with the rest bone condyle; the bottom surface of the main body part is also provided with a bone trabecula layer; bone trabecular hole porosity of the bone trabecular layer: 50% -80%, bone small Liang Kongjing: 200 um-800 um, bone small Liang Sijing: 300um to 700um.

2. The personalized custom knee femoral prosthesis of claim 1, wherein the trabecular bone layer has a thickness of 3mm.

3. The personalized custom knee femoral prosthesis of claim 1, wherein the trabecular bone layer conforms to the epiphyseal physiological curvature.