Patent ID: 6224567
Filing Date: 2001-05-01
Classification: A61M

Abstract:
A single use hand-operated injector device consisting of a plunger section, a base having a cavity and outer surface, a cannula extending from the base and sized to fit into a high-pressure barrel, a snap means for resisting movement of the plunger section and an injection means for injecting at least one parenteral medication through a skin surface of a patient, wherein the improvement comprises:providing a check valve consisting of a snug fitting plug seated at the free end of the cannula and;a widened receptacle area at the distal end of the high-pressure barrel through which the cannula passes and which houses the check-valve plug upon expulsion due to the increase of pressure;whereby, the parenteral medication efficiently flows around the check valve dislodged into the receptacle area at the end of the high-pressure phase of the power stroke and the medication thereby flows into subcutaneous tissue of the patient.