Syringe device with means for removing contaminates when drawing blood sample

Claim 1

A syringe for drawing blood comprising: a tubular body having a leading end with an opening therethrough and connection means in communication with said opening at said leading end for connection to a needle adapted to be inserted into a donor's blood vessel to transfer blood from the blood vessel to the tubular body, and an open trailing end, a needle connected to said tubular body by said connection means, a first slide member slidably received in said tubular body in fluid tight relationship therewith, said first slide member having a passage therethrough in communication with said opening in the leading end of the tubular body, and a second slide member slidably received in said passage in the first slide member in fluid tight relationship therewith, said second slide member having a relatively large portion being in fluid tight relationship with at least a portion of said passage in the first slide member, said passage having a notch in the inner wall thereof at the leading end of said portion of the passage in which the second slide member is disposed, said notch extending along a greater length of the passage than the large portion of the second slide member whereby when the large portion of the second slide member is aligned with said notch, fluid is allowed to flow through the passage.