US 4,507,113 AGranted

Hypodermic jet injector

AssigneeDerata Corporation

InventorKenneth W. Dunlap

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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.

Claims9

Dependent claims

In a hypodermic jet injector system including a hypodermic jet injector of the type having an injector body, an injector nozzle having an orifice therethrough and attachable on one end of said injector body, a medicament chamber within the injector body for receiving, via a delivery means, a predetermined measured quantity of medicament from a medicament supply vial and a means for forcibly ejecting said predetermined measured quantity of medicament through said orifice in said ejector nozzle, the improvement comprising:

(a) the delivery means comprises adapter means attachable to said medicament supply vial, said adapter means including:
1. a base member;
2. a stretchable membrane abutting said base member and cooperating therewith to define a generally closed recess, said stretchable membrane having a zero diameter hole formed therethrough, said membrane being in sealing relation to said recess when said membrane is in its relaxed state;
3. probe means on said base member insertible into said supply vial for conveying liquid medicament from said supply vial to said recess;
and
(b) means on said injector nozzle for coupling said adapter means to said injector nozzle and distending said membrane from said relaxed state to open said zero diameter hole, said open hole being in general alignment with said orifice in said ejector nozzle for allowing flow of fluid from said recess through said orifice into said medicament chamber.

3 more elements

Dependencies are inferred from the claim text.