Patent ID: 7862537

Claim:
A medical device for use with a medicinal vessel containing drug contents and a syringe containing a diluent for reconstituting the drug contents to a reconstituted liquid drug, the device comprising: a) a body member having a syringe port for receiving the syringe, and a vessel port for insertion into the medicinal vessel and in flow communication with said syringe port, the vessel port including a tubular puncturing member for puncturing a stopper sealing a medicine vessel, the puncturing member including a lumen and having a proximal end adjacent to the syringe port and a distal pointed end remote from the syringe port, said proximal end of the puncturing member including a support surface; and b) a one-way flow restriction mechanism including a pin-like flow restrictor deployed within the lumen at the proximal end thereof, said pin-like flow restrictor having a wide diameter head and a downward depending shank and reciprocal with respect to the support surface on injection of diluent into the medicinal vessel for in situ liquid drug reconstitution therein and aspiration of reconstituted liquid drug therefrom, said head having an underside stopped against said support surface in a flow restricting position of said pin-like flow restrictor for positively restricting injection of diluent into the medicinal vessel and displaced from said support surface in a non-flow restricting position of said pin-like flow restrictor for only slightly restricting aspiration of reconstituted liquid drug from the medicinal vessel, if at all, wherein said underside defines a flow channel with said support surface on being stopped thereagainst for positively restricting injection of diluent into the medicinal vessel in said flow restricting position.