Patent ID: 6447475
Filing Date: 2002-09-10
Classification: A61M

Abstract:
A needle-less injector suitable for injecting fluid through a skin surface of a patient, the needle-less injector comprising:a housing containing the fluid and a sealed gas storage chamber containing a gas; a driver that forces the fluid out of the housing at a sufficient speed to pierce the skin surface of the patient; an intruding gas chamber activating mechanism is mounted in the housing to intrude through the sealed gas chamber to release the gas into the housing; a resistance sensitive trigger operatively coupled to the intruding gas chamber activating mechanism to release the gas from the gas chamber into the housing to activate the driver to force the fluid out of the housing upon application of a predetermined amount of pressure to the resistance sensitive trigger that is opposed by a predetermined amount of resistance from the skin surface of the patient resulting from the housing having contact with the skin surface of the patient, such that the fluid is forced out of the housing by the driver to pierce the skin surface of the patient.