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A needleless, low pressure, air powered medicine injector with a quick disconnect medicine delivery assembly removably connected to the injector housing. Low pressure air drives a biased piston through a discharge stroke, beginning from the retracted position into the medicine chamber, thereby forci

A needleless, low pressure, air powered medicine injector with a quick disconnect medicine delivery assembly removably connected to the injector housing. Low pressure air drives a biased piston through a discharge stroke, beginning from the retracted position into the medicine chamber, thereby forcing medicine through a one-piece nozzle. A removable chamber filling mechanism connected to the housing is coupled to the medicine chamber through fill ports, such that the medicine chamber is filled utilizing a positive pressure medicine distributor. A movable spacer collar positioned in front of the nozzle provides an air gap between a patient's skin and the one-piece nozzle. A safety interlock coupled to an activating mechanism and the chamber filling mechanism prevents unwanted discharge of the injection.

대표청구항 ▼

[ We claim:] [1.] A needleless hypodermic injector comprising:a main housing containing an air chamber for receiving air at a pressure between about 50 to 250 pounds per square inch gauge, a driving piston slidably mounted in said chamber, injection activating means to admit pressurized air to said

[ We claim:] [1.] A needleless hypodermic injector comprising:a main housing containing an air chamber for receiving air at a pressure between about 50 to 250 pounds per square inch gauge, a driving piston slidably mounted in said chamber, injection activating means to admit pressurized air to said chamber to activate the driving piston, and means for connecting said chamber to a source of air at a pressure between about 50 to 250 pounds per square inch gauge; anda medicine delivery unit comprising means to detachably mount said delivery unit to said main housing, a medicine chamber with a side wall and a medicine fill port in said side wall of said medicine chamber, said fill port adapted to be connected to a source supplying medicament to said fill port under positive pressure, a discharge nozzle valvelessly connecting one end of said medicine chamber to an ejection orifice with a substantially total absence of dead space between said chamber and said ejection orifice, a discharge piston in said medicine chamber, said discharge piston detachably engaging said driving piston when said delivery unit is mounted in said main housing and is detached from said driving piston when said delivery unit is detached from said main housing, and biasing means urging said discharge piston to an end of said medicine chamber opposite from said discharge nozzle.