What is "jet injector"

n. A kind of medical syringe that uses a high-pressure narrow jet of liquid instead of a hypodermic needle to penetrate the epidermis.

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. It is powered by compressed air or gas, either by a pressure hose from a large cylinder, or from a built-in gas cartridge, small cylinder, or spring (as in the Medijector Vision, Vitajet, Injex 23 and 30, or Insujet).

Jet injectors are used for mass vaccination, and as an alternative to needle syringes for diabetics to inject insulin. As well as health uses, similar devices are used in other industries to inject grease or other fluid.

The term " hypospray" is largely restricted to science-fiction, but there are cases in scientific periodicals of a real jet injector being called a hypospray.