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The "Sickbay" on the Enterprise was a medical science marvel, filled with all sorts of fantastic tools with the capability to diagnose virtually any ailment in existence and perform complex surgeries on life-threatened patients with virtually no blood spilled.
While we've got a long way to go until we get the full set of medical tools that was available to Dr. McCoy, quite a few of Trek's medical gizmos have left their influence on real-life healthcare technology.
The magical diagnostic bed that displayed all sorts of metrics on patient vital signs that was used on the original series did eventually come to fruition as various independent diagnostic and health monitoring equipment used in hospitals today.
One of those is the LifeBed, which is a near-dead ringer for Dr. McCoy's sickbay. Similar diagnostic equipment has been used aboard the International Space Station (ISS) and in mobile field hospitals in the military. Naturally, advanced medical imaging technologies inspired by the original series and Next Generation sickbays made their way into CT and MRI equipment, which are a staple of modern medical diagnosis.
Hypospray and non-invasive surgery
McCoy's "Hypospray," which allowed for instantaneous, bloodless, and needle-free liquid injections, hasn't quite made it in terms of handheld portability yet to every medical office, but a real-life equivalent for use in mass-dosage scenarios exists as the jet injector, and is used for vaccinations by the Department of Defense and other government and relief agencies around the world.
While the truly non-invasive surgery employed on the original Star Trek and TNG shows for generalized use still remains largely science fiction, some procedures such as Stereotactic Radiosurgery for treating specific types of tumors, allow for non-invasive surgery on brain tissue using focused radiation beams.
And while the hand-held directed energy "Phaser" guns used for combat against hostile aliens still remain a fantasy, LASIK surgery using focused low-wattage lasers to correct vision is now well on its way to making eye glasses and contact lenses obsolete.
The "Vorta Command" headset
First shown in Star Trek: Deep Space Nine, the command headset employed by the Dominion "Vorta" overseers of the brutal Jem'Hadar forces was used to have complete situational awareness while piloting their attack ships.
Today, we know this product as Google Glass.