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Shanghai Scientists Experiments Absorbable Silk Bone Screws

Feb 28, 2017

A research team led by Tao Hu from Shanghai Institute of Microsystem and Information Technology under the Chinese Academy of Sciences, has successfully invented a kind of absorbable bone screw made of silk material. The result of the research has been published in the Advanced Materials journal.

Bone screws, a type of medical appliance, are mostly made of titanium alloy or stainless steel. The problem is that a secondary surgery is needed to take them out of the patient's body after rehabilitation, but it can be solved if using silk bone screws.

The silk bone screws were made in five steps: from silkworm cocoon to silk, then from silk to silk protein solution, and then being extracted into a solid material, and then finally forming screws by precision machining using lathe.

Silk bone screws are not only degradable, its rate of degradation can also be precisely controlled by adjusting the internal structure in vivo.

It is reported that animal experiments have been completed for the technology; subsequently there will be further cooperation with biomedical enterprises to carry out clinical researches. It is expected to be commercially produced in three or four years' time. (CGTN)

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