Bicompartmental syringe

Claim 1

A combined mixing and injecting syringe comprising: a pair of complentary members joined to form an elongated compartment, piston means slideably disposed at one end of one of said members and having a needle-like extension extending therefrom toward the opposite end of the said one member, plunger means for moving said piston means toward said other memebrs, a first diaphragm disposed in the elongated compartment intermediate the ends of the compartment and separating the compartment into two separate and isolated chambers which may each contain a different substance, and a second diaphragm disposed across said other member to define one end of the compartment, said needle-like extension of said piston means being positioned in one chamber before operation of said plunger means causes the extension to puncture said first diaphragm, and said extension having means defining an elongated recess extending along a substantial length of said extension toward the tip of the extension whereby communication of materials is permitted between chambers when the first diaphragm is punctured.