Syringe device with means for selectively isolating a blood sample after removal of contaminates

A syringe device for drawing blood samples comprising:

• a tubular body having an interior surface defining an elongated interior chamber, said tubular body having one open end and an end member at the opposite end, said end member having a bore therethrough defining means for connection to a hypodermic needle;
• a plunger slideably positioned within said tubular body, said plunger including an intermediate body portion extending out the open end of said tubular body and a resilient sealing member operatively connected to said intermediate body capable of establishing an hermetic seal with said interior surface of said tubular body;
• at least one flexible seal interrupter, said seal interrupter being generally linear and attached to said intermediate body adapted to interrupt said hermetic seal by being placed between said sealing member and the interior of said tubular body;
• at least one longitudinal groove extending along the interior surface of the tubular body having a chamfer at the forwardmost end thereof and said groove being positioned along the slideable path of said seal interrupter so that said seal interrupter can be positioned in the groove without interrupting the seal between the sealing member and the interior surface of the tubular body;
• and
• means for moving said seal interrupter into a position where it lies across and breaks the seal between the sealing member and said interior surface, and into a position wherein said seal is restored to prevent fluid flow past said sealing member.