Importance

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Abstract

An improved hypodermic jet injector system in which specifically designed adapters are used for joining conventional medicament supply vials to the hypodermic jet injector during the filling of the medicament chamber thereof whereby the valving structure may be greatly simplified and the ready substitution of one medicament for another facilitated such that there is no need to purge the injector device of the previously used medicament. The adapter comprises a relatively low-cost attachment for a medicament supply vial including a stopper-piercing needle having both a liquid passage and an air passage therein. The adapter also includes a hollow recess of a predetermined shape which has a stretchable membrane forming one wall thereof, the membrane having a zero diameter hole formed through it when the membrane is unstretched. The liquid passage of the piercing needle leads to the hollow recess. When the adapter is coupled to the nose of the hypodermic jet injector device, the membrane is distended into the recess, thus opening the zero diameter hole in the membrane and allowing the medicament to flow from the vial, through the open hole in the membrane and into the medicament chamber of the injector device via its injection orifice.

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First Claim