Nickel-titanium shape memory alloy umbrella-titanium mesh femoral head internal supporting device

Abstract

The invention provides a built-in instrument for preventing from osteonecrosis and collapse of the femoral head, and particularly discloses a built-in device which can be implanted into the femoral head to prevent from osteonecrosis of the femoral head and preventing the femoral head from early collapsing after a core compression. The build-in device mainly comprises a nickel-titanium shape memory alloy umbrella, a TA2 pure titanium supporting device body, and TA2 pure titanium tail fastening screws, wherein the nickel-titanium shape memory alloy umbrella is arranged at one end of the supporting device body, and the other end of the supporting device body is jointly inserted to the tail fastening screw; the nickel-titanium shape memory alloy umbrella comprises eight supporting belts, and is structured as a semispherical umbrella shape; the nickel-titanium shape memory alloy umbrella is controlled through the phase-transition temperature after being expanded; the supporting device body has a titanium mesh structure which can contain bone materials or growth factors; and the tail fastening screw has the function of guiding and self-tapping, which is capable of fixing the supporting device and transmitting the stress. The supporting device has the characteristics that the nickel-titanium shape memory alloy umbrella is arranged; after being implanted into a small-aperture core compression bone tunnel, the nickel-titanium shape memory alloy umbrella can be automatically expanded to increase the supporting area and adapt to the defect of endoskeleton of the femoral head; with adoption of the titanium mesh structure, the bone ingrowth can be increased. By adopting the supporting device, the femoral head can be effectively prevented from osteonecrosis and collapse after the core compression.

Description

1. Technical field [0001] The invention relates to an implant device for preventing femoral head necrosis and collapse, in particular an implant implanted in the femoral head for preventing femoral head collapse after early pulp core decompression. 2. Background technology [0002] Avascular necrosis of the femoral head is a common and frequently-occurring disease in orthopedics. The destruction of the blood supply of the femoral head caused by various reasons can cause the death of the active components of the femoral head. During the repair process of the osteonecrosis area, the early necrotic bone trabeculae are mainly absorbed, which makes the collapsed area more fragile, and micro-fractures occur before complete repair, which in turn causes changes in the mechanical properties of the femoral head, deformation and collapse of the femoral head , thereby seriously affecting joint function. Core decompression surgery is currently recognized as an effective method for the ...

AI Technical Summary

Problems solved by technology

This type of support device can avoid the deficiency of the aforementioned support device to a certain extent, but the nitinol tennis ball is woven with superelastic nickel-titanium alloy wire, the increase of the support area is limited, and the mechanical strength is not as good as that of nickel with shape memory effect. Titanium alloy plate; there are also femoral head internal supports that expand the support blades by mechanical devices to increase the support area, but the support blades are linked to each other and have poor elasticity, which do not fit well with the inner cavity of the femoral head after the core is decompressed. Ideally, once one blade is blocked from opening, the rest of the blades will not be able to expand

[0005] To sum up, due to the uneven performance of the existing support devices, it is often difficult to give full play to the support effect on the femoral head, which is unfavorable for preventing the femoral head from collapsing after the decompression of the pulp core, which will inevitably cause the femoral head to collapse and damage the joint function. Seriously affect the health of the people, and at the same time increase medical expenses and social costs

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