apheresis

Apheresis (ἀφαίρεσις (aphairesis, "a taking away")) is a medical technology in which the blood of a person is passed through an apparatus that separates out one particular constituent and returns the remainder to the circulation. It is thus an extracorporeal therapy. The apheresis machine was invented by American medical technologist Herb Cullis in 1972 https://en.wikipedia.org/wiki/Apheresis