Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Vladimir Spiridonovich Gigauri was a professor and academician He was born in Tbilisi, Georgia in 1934. He died in 2006. He was a renowned Georgian-born soviet scientist. He invented over 200 products in the fields of Medicine, Biomedical Engineering, Army, and Space. Gigauri was best known for his needle-free Jet injector, and a breathing apparatus used in space. He also did major works on the Soviet/Russian artificial heart. A jet injector is a type of medical injecting syringe that uses a high-pressure narrow jet of the injection liquid instead of a hypodermic needle to penetrate the epidermis. They are powered by compressed air or gas, either by a pressure hose from a large cylinder, or from a built-in gas cartridge or small cylinder.