Surgery – Diagnostic testing – Liquid collection
Patent
1997-02-07
1999-02-23
Hindenburg, Max
Surgery
Diagnostic testing
Liquid collection
A61B 500
Patent
active
058738410
ABSTRACT:
A medical syringe for collecting blood samples is provided, comprising a cylindrical body having an open end and a closed end. A plunger assembly including a piston is slidably inserted into the open end, defining a fluid chamber between the piston face and the closed end. A distal opening in the closed end provides passage between the syringe and a patient, and includes a restriction therein. A conduit extends from the fluid chamber through the plunger assembly to a tube-holding device, or may extend peripherally from the cylindrical body to the tube-holding device. Fluid is drawn into the fluid chamber, and a vacuum specimen tube is inserted into the tube-holding device, the vacuum drawing fluid into the tube. The restriction in the distal opening imposes a viscous resistance to flow, slowing blood flow into the syringe, preferentially drawing fluid into the specimen tube from the fluid chamber, and decelerating movement of the plunger assembly. Alternatively a cannula extends between the distal opening and the conduit, the restriction substantially isolating a fluid sample in the fluid chamber from a sample drawn through the cannula.
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Hindenburg Max
Vascular Logics, Inc.
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