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Gas pressured needle-less injection device and method

  • US 5,851,198 A
  • Filed: 10/09/1996
  • Issued: 12/22/1998
  • Est. Priority Date: 10/10/1995
  • Status: Expired due to Fees
First Claim
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1. A needle-less injector suitable for injecting liquid medication through a skin surface of a patient, the needle-less injector comprising:

  • a housing containing the liquid medication, wherein the housing includes an injection end with an orifice and a trigger portion opposite the injection end, wherein the injection end is stationary and fixed relative to the housing;

    a driver that forces the medication out of the orifice of the injection end of the housing at a sufficient speed to pierce the skin surface of the patient;

    an at least partially external resistance sensitive trigger operatively coupled to the driver and the trigger portion of the housing, wherein movement of the resistance sensitive trigger activates the driver to force the liquid medication out of the orifice of the injection end of the housing upon application of a predetermined amount of pressure to the resistance sensitive trigger to move the resistance sensitive trigger relative to the housing towards the injection end and the skin surface and that is opposed by a predetermined amount of resistance from the skin surface of the patient resulting from the injection end of the housing having contact with the skin surface of the patient such that only the forced out liquid medication will pierce the skin surface of the patient, and wherein the resistance sensitive trigger moves closer towards the skin surface during an injection while the injection end and the housing remain substantially stationary relative to the skin surface, and wherein the resistance sensitive trigger is operatively decoupled from the driver after the injection.

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