Hypospray Equals Jet Injector

In the Star Trek universe, the hypospray was able to get medications into patients  through their skin, even their clothes, without using needles. In real life, this device was the jet injector, which never really became widespread because of concerns over cross-contamination, since even the tiniest particles of blood retained in such devices could include viruses. 

Development of new and improved jet injectors continues, though. Shown above is an illustration of a jet injector announced at MIT in 2012. MIT researchers touted the device as an improvement because it could be programmed to deliver a range of doses to various depths (kind of like the hypospray in Star Trek). 

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