Blood collection syringe

Details Blood collection syringe Blood collection syringe

A - Human Necessities

61

M

128/83

A61M 5/00 (2006.01) A61B 5/15 (2006.01)

Patent

CA 1172930

Case No. 800232 BLOOD COLLECTION SYRINGE Christen C. Rattenborg ABSTRACT OF THE DISCLOSURE A syringe for collecting a blood sample includes a cylindrical housing having a hollow needle at one end. A plunger slidably mounted within the housing defines a chamber within which blood collected by the needle is received. A hydrophilic bypass element disposed between the rim of the plunger and the inside surface of the housing forms a passage- way through which air is exhausted as blood enters the chamber under arterial pressure. The passageway is automatically closed to prevent leakage from the chamber when the chamber becomes filled with blood and the bypass element is wetted. An alternate embodiment wherein the hydrophilic bypass element is in the form of an annular sleeve extending around the rim of the plunger is shown.

373835

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