Needleless Injections?

Has anyone ever recieved a needless injection? I know the technology exists, and according to the needless injection company Bioject, it is very widely used. If it is so widely used, where is it used?
Answer:
When I was in the military boot camp, that is the way they did it. It is done with the use of compress air that 'shoots' the injections into your arm. It is a quick way to do a lot of people fast.

To me, it hurt more than with a needle. Also if you move while it is being done, it can rip the skin.

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in some hospitals and other offices. they are expensive so most dr.s dont have them.

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A needleless injection device comprising a cylinder for medicine having an injection nozzle at a forward end thereof and an opening at its rearward end; a piston sliding in the cylinder through said open end, in use, to drive the medicine through the nozzle; a ram to drive the piston into the cylinder and having a longitudinal axis; and a mechanical energy accumulator to drive the ram when discharged and disposed between the ram and a discharge assembly, a rear end of the ram extending into said discharge assembly; wherein the discharge assembly comprises a retention member fixed in the assembly, said retention member having a plurality of retention elements spaced around and adapted to locate on the ram when in a charged position of the ram, and a release ring surrounding said retention elements to prevent radial outward displacement thereof and discharge of the ram; and wherein axial displacement of said release ring releases said retention elements and causes discharge of the ram by said accumulator; characterised in that said retention elements are integral with said retention member and each has an enlarged head which can move into and out of engagement with a groove or recess on the ram by deformation of the material of said retention member.

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an injection requires always penetration

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Hospitals have almost universally gone to needleless systems. But there's a bit of a misnomer there. The system works on the injection port in an IV line. Getting the IV in still starts with the needle inside the IV catheter. To the patient, there's no difference between the needleless system and the traditional one. The difference is in the decreased risk of accidental needle sticks to the nurses who are periodically injecting something into the IV line.

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