A lack of suitable donors for transplants, particularly as cars get safer and first-aid becomes more effective, means the supply of such organs is limited.
One promising approach is to print them. As yet, such ?bioprinting? remains largely experimental. But bioprinted tissue is already being sold for drug testing, and the first transplantable tissues are expected to be ready for use in a few years? time.
http://www.economist.com/news/science-and-technology/21715638-how-build-organs-scratch?
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Implanted medical devices like stents, catheters, and titanium rods are essential, however sometimes the body rejects them or they cause dangerous blood clots. Engineers and scientists from Colorado State University have developed a superhemophobic surface treatment for titanium that repels liquids including blood, plasma, and water. The result is a surface that completely repels any liquid with which it would come in contact and the body doesn't even recognize that it's there. https://futurism.com/weve-created-a-life-saving-blood-repellant-super-material/
