Gradient composite bar material and manufacturing method thereof

Abstract

The invention discloses a gradient composite bar material and a manufacturing method thereof. The bar material is formed by two times of freeze drying shaping and two times of high temperature sintering; the bar material is perfectly straight and is composed of two parts, namely an inner layer and an outer layer, the outer layer uniformly wraps the inner layer, the degradation speed of the outer layer is lower than that of the inner layer, and the mechanical strength of the inner layer is higher than that of the outer layer. The bar material has high mechanical strength and good biological activity, the bar material can be continuously absorbed in vivo, a phosphate layer is generated in the absorption and degradation process, and bone conduction is facilitated. Due to the gradient degradation design of the bar material, time and mechanical support guarantee is provided for fracture healing, and fracture healing can be better promoted.

Description

technical field [0001] The invention relates to a device in the technical field of medical devices and a manufacturing method thereof, in particular to a gradient composite rod and a manufacturing method thereof. Background technique [0002] In real life, people often fracture, and implanting internal fixation implants, such as intramedullary nails, is the most common treatment. However, the intramedullary nails currently used clinically are mainly made of stainless steel and titanium alloys. The mechanical strength of the intramedullary nails made of these alloys does not match that of human bones, which will produce a stress shielding effect, making the healing effect of fractures poor or even failure. . At the same time, this type of intramedullary nail will slowly release toxic ions or particles after being implanted in the body, causing chronic inflammation, resulting in difficult recovery and poor biological activity. In addition, this type of intramedullary nail do...

AI Technical Summary

Problems solved by technology

However, the intramedullary nails currently used clinically are mainly made of stainless steel and titanium alloys. The mechanical strength of the intramedullary nails made of these alloys does not match that of human bones, which will produce a stress shielding effect, making the healing effect of fractures poor or even failure.

At the same time, this type of intramedullary nail will slowly release toxic ions or particles after being implanted in the body, causing chronic inflammation, making it difficult to heal and having poor biological activity.

In addition, this type of intramedullary nail does not degrade in the body and requires a second operation to remove it, which causes complications and increases the economic burden and pain of the patient

[0003] Absorbable intramedullary nails can solve some of the above problems, but currently clinical absorbable devices are basically made of polymer materials, such as polylactic acid, polyvinyl alcohol, chitosan, etc. Acidic substances can also cause rejection

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