Modularized artificial hip joint femoral shaft

Abstract

The invention relates to a modularized artificial hip joint femoral shaft, in particular to an artificial hip joint femoral shaft structure for replacement in human body medical treatment, which is used to be embedded in a proximal end femoral medullary cavity of a patient in a closely fit mode. The modularized artificial hip joint femoral shaft comprises a base body embedded in the proximal end femoral medullary cavity and provided with a through hole with a taper, and a support shaft inserted through the through hole, wherein the base body and the support shaft are provided with a positioning slot and a positioning key which correspond to each other respectively; one end of the support shaft is provided with a joint end, while the other end is provided with a femoral shaft end; and the femoral shaft end is provided with a taper segment which is correspondingly and closely pressed against the taper of the through hole. The modularized artificial hip joint femoral shaft is characterized in that the base body comprises a first element and a second element which are provided with a groove formed by the through hole respectively, wherein the first element is provided with a first assembly and the second element is provided with a second assembly in bond connection with the first assembly, so that the femoral shaft can be matched with diverse femoral medullary cavities and has the advantages of diversity and modularization.

Description

technical field [0001] The invention relates to a modular artificial hip joint femoral handle, in particular to an artificial hip joint femoral handle structure for human medical replacement. Background technique [0002] The hip joint is an important hub connecting the trunk and lower body of the human body, and it is related to the freedom of movement of the lower limbs. Femoral neck fractures, etc., often cause the patient's limb activities to be restricted, pain, which affects the quality of life of the patient, and even incapacitates the patient's work. At this time, artificial hip replacement surgery is usually performed. [0003] The existing known artificial hip replacement involves surgically removing the damaged joint, femoral head, chiseling out the femoral medullary cavity, and reconstructing the acetabulum. In an ideal state, after the artificial hip is implanted in the patient, its shape The appearance and angular position should be the same as the patient's o...

AI Technical Summary

Problems solved by technology

[0003] The existing known artificial hip replacement involves surgically removing the damaged joint, femoral head, chiseling out the femoral medullary cavity, and reconstructing the acetabulum. In an ideal state, after the artificial hip is implanted in the patient, its shape The appearance and angular position should be the same as the patient's original hip joint, but in practice, due to factors such as height, body shape, and race, the artificial hip joint cannot satisfy different patients with a single size and angle. patient needs

[0004] In order to solve the above problems, a feasible method is to order artificial hip joint components according to the size of each patient, but this method will inevitably result in high surgical costs, and only a very small number of patients can absorb this cost, and because of tailor-made Therefore, artificial hip joints that can adjust the swing angle of the femoral stem and the upper end of the femoral stem have been developed, as shown in U.S. Patent No. 6464728 and U.S. Patent No. 5653764. This technical means Although the swing angle of the femoral stem and the upper end of the femoral stem can be adjusted, the connection between the femoral stem and the upper end of the femoral stem may be easily detached by using a shallow snap-fit ​​method. In addition, considering the femoral circumference shape of different patients The size is different, so the hospital must purchase many femoral stems with different circumference shapes and sizes, so that when the femoral stem is embedded in the proximal femoral medullary cavity (referring to the end of the femoral medullary cavity close to the hip joint), it can fit tightly and fit the patient demand, and therefore indirectly increased the cost of surgery; moreover, in order to reduce the cost of warehousing and material preparation, and enable manufacturers to easily mass-produce and manufacture low-cost artificial hip joints, modular artificial hip joints have been developed, such as the US Patent No. No. 5201882, U.S. Patent No. 5370706 and No. 6911048, U.S. Patent No. 5702480, U.S. Patent No. 7235106, and the People's Republic of China Patent Publication No. CN101006946A, the above-mentioned patents all divide the artificial hip joint into several components. Combining components of different sizes and angles according to the needs of different patients can combine a large number of artificial hip joints of different sizes and angles with a small amount of component storage. The operation is easy to become more complicated. If there is a slight component manufacturing weakness or a negligence in the operation combination in a certain link, the entire artificial hip joint will not be able to bear the pressure of the limb movement and will be damaged, losing its due effect.

[0005] Looking at the above technologies, although the modular design of the artificial hip joint can reduce storage costs and manufacturing costs, in fact, the modular design of the femoral stem cannot meet the needs of various patients, because the design of the femoral stem In the case of modularization, at present, there are only changes in diameter and bilateral symmetry, which does not take into account the irregular and asymmetric shape of the proximal femoral medullary cavity dug out in some patients. The most obvious thing is that it is applied to patients with Developmental Dysplasia of Hip (DDH). Clinically, it is found that in patients with DDH, the shape of the individual femoral medullary cavity is very different. The matching degree of proximal femoral medullary cavity is very low, it is difficult to be placed tightly, and it is easy to cause the femoral stem to loosen after surgery. Such patients cannot enjoy the advantages of convenience and low cost brought by the modularization of artificial hip joints.

It can be seen that the existing known technology is modularized to reduce storage costs and manufacturing costs. At the same time, it is difficult to take into account all the needs of the diversity of artificial hip joints. There is still room for improvement in artificial hip joints.

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