Femoral stem provided with buffer section

Abstract

A femoral stem provided with a buffer section comprises a metal body made of a metal material and an elastic body, wherein the metal body contains a base column part which can extend into the medullary space of a femur of a patient, an artificial femoral head can be connected at the top end of the base column part, and a linkage rod longitudinally and axially extends out of the bottom end of the base column part; the elastic body is made of an elastic material such as PU and the like, a penetrating hole penetrates through the elastic body to allow the linkage rod to be accommodated, and the ideal axial length of the elastic body is larger than 3 cm. The linkage rod not only can provide enough strength for the longitudinal femoral stem, but also can elastically extrude the elastic body in the medullary space of the patient when the femoral stem implanted in the medullary space of the patient generates a huge amount of bending torque, so that stress borne by the whole femoral stem and the femur of the patient at the moment can be buffered and counteracted, and breakage of the femur or the femoral stem is avoided.

Description

technical field [0001] The present invention relates to a femoral stem with a cushioning section, in particular to a linkage rod penetrating through a lengthwise elastic body to link the elastic body against the medullary cavity of the patient's femur in the direction of an external force to buffer the femur. External force, to avoid breaking the femoral stem or human femur. Background technique [0002] Due to the human hip joint, there may be many reasons such as congenital hip joint dysplasia, degeneration, disease or external force, resulting in deformation of the femoral head, acetabular wear and other conditions, making the patient's legs sore and difficult to walk. . Most of the current solutions are artificial hip replacement surgery, so that patients do not need to bear the discomfort caused by hip joint disease. In the aforementioned artificial hip joint replacement operation, a longitudinal femoral stem is implanted in the patient's femur, and then a bone is con...

AI Technical Summary

Problems solved by technology

[0004] However, after the above-mentioned conventional femoral stem 50 is operated, the space between the femoral stem 50 and the medullary cavity 41 of the patient's femur 40 is filled with hard bone cement; when the femoral stem 50 is subjected to external force, the external force will directly pass through the hard fixed The delivery of agent P acts on the patient's femur 40, and there is no room and effect for buffering external force

that is, figure 2 As shown, when the top of the femoral stem 50 bears the action of the external force (F), a bending moment M will be generated in the whole femoral stem 50, and the femoral stem 50 will be pressed toward one side in the medullary cavity 41 of the patient's femur 40, In some medical cases, the fracture of the patient's femur 40 or the fracture of the femoral stem 50 occurred due to the excessive instantaneous bending moment (M) generated by the femoral stem 50, resulting in the failure of artificial hip joint replacement surgery; The main reason is that there is no proper buffer between the femoral stem 50 and the femur 40 when the external force is applied, and the instantaneous stress cannot be dispersed and offset; therefore, how to have the necessary strength and provide an appropriate buffer for the external force is really a problem. Issues urgently needed to be faced in the design of femoral stem 50

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