Variable intensity remote controlled needleless injectors

摘要

An apparatus for injecting liquids into a body without using hypodermic needles, the liquid being ejected from a small orifice in a probe at a velocity which will penetrate the surface of a body against which the probe is placed. The apparatus ejects a specific small volume of the liquid under a very high initial velocity and pressure followed by the ejection of the main charge of liquid at a lower velocity so that the liquid flows into the channel caused by the initial penetration without penetrating to a greater depth. The probe is connected to a hand-held portion whose other end is attached via a flexible tube containing a suitable hydraulic fluid to two remote pressure intensifiers, one of which creates the required high initial pressure for a short period of time and the other of which provides the pressure necessary to eject the main charge of liquid at a lower velocity. The second intensifier is synchronized electronically or mechanically to follow the initial pulse when its pressure decays to the main charge injection pressure. The pressures created by the high pressure intensifier and second pressure intensifier are individually adjustable for various type of situations, such as depth of penetration or skin conditions.