CN216090943U

CN216090943U - Femoral prosthesis

Info

Publication number: CN216090943U
Application number: CN202121692496.5U
Authority: CN
Inventors: 丁涛
Original assignee: Hangzhou Lanxin Medical Technology Co ltd
Current assignee: Hangzhou Lanxin Medical Technology Co ltd
Priority date: 2021-07-24
Filing date: 2021-07-24
Publication date: 2022-03-22
Anticipated expiration: 2031-07-24

Abstract

The utility model provides a femoral prosthesis, which comprises a medial condyle, a lateral condyle and a pulley groove arranged between the medial condyle and the lateral condyle, wherein the anterior-posterior diameter of the femoral prosthesis is AP, the left-right diameter of the femoral prosthesis is ML, the height of the anterior condyle of the femoral prosthesis is AH, the height of the medial condyle and the posterior condyle of the femoral prosthesis is MPH, and the height of the lateral condyle and the posterior condyle of the lateral condyle are LPH. The ratio of the left-right diameter ML to the anterior-posterior diameter AP of the knee joint femoral prosthesis ranges from 1.0 to 1.3, and the ratio decreases linearly with the increase of the anterior-posterior diameter AP. The relationship between the front and back diameters AP and the left and right diameters ML may be approximately fit to-0.002 AP + 1.25. The femoral prosthesis provided by the utility model conforms to the anatomical structure of a human body, can improve the coverage rate of the femoral prosthesis and reduce the probability of postoperative loosening and pain of the femoral prosthesis.

Description

Femoral prosthesis

Technical Field

The utility model relates to a femoral prosthesis, in particular to a femoral prosthesis used in the medical field.

Background

Knee Osteoarthritis (OA) is a common chronic irreversible knee joint disease characterized by degenerative changes in articular cartilage and secondary hyperosteogeny, a chronic damage to articular cartilage and surrounding soft tissues characterized by pain, stiffness, and loss of joint function. OA has a very high incidence among the population, and data studies have shown that 9.6% of men and 18% of women in older people over the age of 60 worldwide have a certain degree of OA symptoms, and the incidence of OA will be higher as the aging process is accelerated, and the pace of life becomes faster.

Knee replacement is the primary treatment at the end of OA of the knee joint. The knee joint replacement is to replace the diseased knee joint bone tissue with a knee joint prosthesis to relieve or relieve pain of a patient and recover and reconstruct the function of a natural knee joint, and with the continuous design improvement of the knee joint prosthesis and the continuous improvement of the operation technology, the knee joint replacement becomes a mature operation technology, and the survival rate of 10 to 15 years can reach more than 90 percent.

The main revision reasons of knee joint replacement are prosthesis loosening and postoperative pain, poor prosthesis coverage is an important factor causing the prosthesis loosening and postoperative pain, the prosthesis coverage is insufficient, the prosthesis cannot fully cover a cortical bone area, the prosthesis cannot be well supported, and the postoperative prosthesis is easy to sink and loosen; the prosthesis overhangs and interferes with the surrounding soft tissue, causing post-operative pain. Therefore, improving prosthesis coverage is one of the primary goals of modern knee prosthesis design.

SUMMERY OF THE UTILITY MODEL

The utility model provides a femoral prosthesis, which conforms to the anatomical structure of a human body, can improve the coverage rate of the femoral prosthesis and reduce the probability of postoperative loosening and pain of the femoral prosthesis.

According to one aspect of the present invention, there is provided a femoral prosthesis comprising a medial condyle, a lateral condyle, and a trochlear groove disposed between the medial condyle and the lateral condyle, the femoral prosthesis having an anterior condyle height AH, a lateral condyle height ML, a medial condyle posterior condyle height MPH, and a lateral condyle height LPH. The ratio of the left-right diameter ML to the anterior-posterior diameter AP of the femoral prosthesis ranges from 1.0 to 1.3, and the ratio linearly decreases with the increase of the anterior-posterior diameter AP, and the relationship between the anterior-posterior diameter AP and the left-right diameter ML can be approximately fitted to ML/AP of-0.002 AP + 1.25.

Preferably, the femoral prosthesis has an anterior condyle height AH that increases with increasing anterior-posterior diameter AP, and a ratio AH/AP ranging from 0.6 to 1.2 that increases with increasing anterior-posterior diameter AP.

Preferably, the relationship between the anterior-posterior diameter AP and the anterior condyle height AH is linearly fit to AH/AP 0.006 AP + 0.47.

Preferably, the posterior condylar height MPH of the medial condyle of the femoral prosthesis increases with the increase of the anterior-posterior diameter AP, and the ratio MPH/AP of the two ranges from 0.4 to 1.0, and the ratio decreases with the increase of the anterior-posterior diameter AP.

Preferably, the posterior condylar height MPH of the medial condyle and the anterior-posterior diameter AP may be linearly fit to-0.002 AP +0.75 MPH/AP.

Preferably, the femoral prosthesis lateral condyle posterior condyle height LPH increases with increasing anterior posterior diameter AP, and the ratio LPH/AP ranges from 0.5 to 0.8, and the ratio decreases with increasing anterior posterior diameter AP.

Preferably, the posterior condylar height LPH and anterior-posterior diameter AP of the lateral condyle may be linearly fitted to-0.0015 AP +0.70 LPH/AP.

The femoral prosthesis provided by the utility model conforms to the anatomical structure of a human body, can improve the coverage rate of the femoral prosthesis and reduce the probability of postoperative loosening and pain of the femoral prosthesis.

Drawings

Fig. 1 is an illustration of the orientation of a human body according to the present invention.

Fig. 2 is a schematic view of a femoral prosthesis of the present invention.

Fig. 3 is a schematic view of another angle of the femoral prosthesis of the present invention.

Fig. 4 is a side view of a femoral prosthesis of the present invention.

Detailed Description

Embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

To better explain the technical solutions of the present invention, the terms of orientation in the embodiments are explained first. Referring to fig. 1, the directions are explained as follows:

sagittal plane: longitudinally cutting the human body or the joint into a section formed by a left part and a right part from the front and back directions;

frontal plane: from the left and right direction, the human body or the joint is divided into a front section and a rear section, and the section is vertical to the sagittal plane;

cross section: from the up-down direction, the section divides the human body or the joint into an upper section and a lower section, and the section is vertical to the frontal plane and the sagittal plane;

a far end: the end of the body or joint relatively far from the head;

proximal end: the human body or joint is relatively close to one end of the head;

inner side: relatively close to the sagittal plane of a human body;

outside: relatively deviated from the sagittal plane of the human body;

front: deviated from the frontal plane and close to the face of the human body;

rear: deviated from the frontal plane and close to the back of the human body.

Referring to fig. 2-4, the knee joint femoral prosthesis 10 is comprised of a medial condyle 11, a lateral condyle 12, and a trochlear groove 13. The trochlear groove 13 is provided between the medial condyle 11 and the lateral condyle 12. The anterior-posterior diameter of the femoral prosthesis 10 is AP and the left-right diameter is ML. The femoral prosthesis 10 has an anterior condyle height AH and the medial condyle 13 of the femoral prosthesis 10 has a posterior condyle height MPH. The lateral condyle 14 has a posterior condyle height LPH.

The ratio of the left-right diameter ML to the anterior-posterior diameter AP of the knee joint femoral prosthesis 10 ranges from 1.0 to 1.3, and the ratio decreases linearly with the increase of the anterior-posterior diameter AP. The relationship between the anterior-posterior diameter AP and the left-right diameter ML may be approximated to be ML/AP-0.002 AP + 1.25.

The femoral prosthesis 10 has an anterior condyle height AH which increases with the anterior-posterior diameter AP, and a ratio AH/AP which increases with the anterior-posterior diameter AP ranges from 0.6 to 1.2, and the relationship between the two can be linearly fit to AH/AP being 0.006 AP + 0.47.

The femoral prosthesis 10 has a medial condyle posterior condyle height MPH that increases with increasing anterior-posterior diameter AP, a ratio MPH/AP in the range of 0.4-1.0 that decreases with increasing anterior-posterior diameter AP, and a relationship between MPH/AP that is-0.002 AP +0.75 may be linearly fit.

The femoral prosthesis 10 has a posterior condylar height LPH of the lateral condyle that increases with increasing anterior-posterior diameter AP, with a ratio LPH/AP in the range of 0.5-0.8, which decreases with increasing anterior-posterior diameter AP, and the relationship between these two may be linearly fit to LPH/AP-0.0015 AP + 0.70.

The femoral prosthesis 10 adopting the design parameters is more matched with the anatomical shape of the human knee joint femur, the anatomical coverage rate of the femoral prosthesis can be effectively improved, and the probability of prosthesis loosening and pain of a patient after operation is reduced

It will be apparent to those skilled in the art that various modifications and variations can be made to the above-described exemplary embodiments of the present invention without departing from the spirit and scope of the utility model. Thus, it is intended that the present invention cover the modifications and variations of this invention provided they come within the scope of the appended claims and their equivalents.

Claims

1. A femoral prosthesis comprising a medial condyle, a lateral condyle and a trochlear groove disposed between the medial condyle and the lateral condyle, the femoral prosthesis having an antero-posterior diameter AP and a left-right diameter ML, the femoral prosthesis having an anterior condyle height AH, the femoral prosthesis having a medial condyle posterior condyle height MPH and the lateral condyle posterior condyle height LPH, wherein the femoral prosthesis has a ratio of the left-right diameter ML to the antero-posterior diameter AP ranging from 1.0 to 1.3 and decreasing linearly with increasing of the antero-posterior diameter AP, and the relationship between the antero-posterior diameter AP and the left-right diameter ML is approximately fitted to ML/AP-0.002 AP + 1.25.

2. The femoral prosthesis of claim 1, wherein the anterior condyle height AH of the femoral prosthesis increases with increasing anterior-posterior diameter AP, and wherein the ratio AH/AP ranges from 0.6 to 1.2, which increases with increasing anterior-posterior diameter AP.

3. The femoral prosthesis of claim 2, wherein the relationship between the anterior-posterior diameter AP and the anterior condyle height AH is fit linearly to AH/AP-0.006 AP + 0.47.

4. The femoral prosthesis of claim 1, wherein the medial condyle of the femoral prosthesis has a posterior condyle height MPH that increases with increasing anterior-posterior diameter AP, and wherein the ratio MPH/AP ranges from 0.4 to 1.0, which decreases with increasing anterior-posterior diameter AP.

5. The femoral prosthesis of claim 4, wherein the posterior condyle height MPH of the medial condyle is linearly fit to the anterior-posterior diameter AP at MPH/AP-0.002 AP + 0.75.

6. The femoral prosthesis of claim 1, wherein the posterior condyle height LPH of the lateral condyle of the femoral prosthesis increases with increasing anterior-posterior diameter AP, and wherein the ratio LPH/AP ranges from 0.5 to 0.8, which decreases with increasing anterior-posterior diameter AP.

7. The femoral prosthesis of claim 6, wherein the posterior condyle height LPH of the lateral condyle is linearly fitted to the anterior-posterior diameter AP by-0.0015 AP + 0.70.