Surgery – Truss – Pad
Patent
1980-03-31
1982-07-20
Yasko, John D.
Surgery
Truss
Pad
128218PA, A61B 514
Patent
active
043400671
ABSTRACT:
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 passageway 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.
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