Patent ID: 6210359
Filing Date: 2001-04-03
Classification: A61M

Abstract:
A single use needleless syringe for administering a fluid medication, the syringe comprising:a hollow, tubular body comprising:a gas storage portion defining a storage chamber containing a quantity of a compressed gas;an ejector portion defining a piston chamber which is selectively placeable into fluid communication with the storage chamber and has a piston movably disposed therein;a barrel portion defining a delivery chamber for receiving a prescribed dosage of the fluid medication, the delivery chamber being oriented relative to the piston chamber such that the piston is advanceable into the delivery chamber; anda discharge orifice in fluid communication with the delivery chamber for allowing the fluid medication to be filled thereinto and expelled therefrom;a fracturable release member disposed within the body for preventing the flow of the compressed gas from the storage chamber into the piston chamber; anda trigger mechanism removably attachable to the body and comprising:a stem portion partially insertable into the body and engagable to the release member; anda head portion attached to the stem portion;wherein the application of compressive pressure to the head portion subsequent to the insertion of the stem portion into the body facilitates the fracture of the release member and resultant flow of the compressed gas into the piston chamber, the compressed gas acting against the piston in a manner forcing the piston into the delivery chamber which causes the fluid medication to be expelled therefrom via the discharge orifice.