Importance

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Abstract

A prefilled, readily activated syringe assembly wherein a fluid medicament and a diluent therefor can be intermixed in a syringe barrel with a venting thereof. A medical powder is sealed in a barrel by means of an intermediate slidable stopper and the diluent is sealed in the same barrel between the stopper and a plunger stopper. A bypass channel is provided in the syringe barrel which permits intermixing of the diluent and the medicament when the plunger stopper is moved toward the intermediate stopper. Movement of the plunger stopper inwardly in the barrel is afforded by means of a hydrophobic filter element associated with the nozzle portion. After intermixing of the diluent and the medicament the filter vent is pierced by means of a piercing tubular member to which is attached a hypodermic needle. Continued movement of the plunger stopper will expel the mixed medicament from the syringe.

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First Claim