Aspirating syringe having a plunger guide for a reciprocating plunger assembly
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United States of America Patent
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Dec 10, 1996
Grant Date -
N/A
app pub date -
Sep 28, 1995
filing date -
Sep 28, 1995
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Disclosed is an aspirating syringe having a hollow barrel and a piston assembly that is adapted to move reciprocally through the barrel, whereby the barrel is first infused with a fluid medication from a standard pharmaceutical vial during an infusion step so that the medication can then be expulsed to a target tissue site during an injection step. A pair of elongated plunger guides extend axially and proximally from the barrel in parallel alignment with each other. Each of the plunger guides has a longitudinal track groove to receive a respective guide tab carried by and movable with the piston assembly. The guide tabs ride through the track grooves of the plunger guides to stabilize the reciprocal movement of the piston assembly and thereby permit the barrel to be infused with a precise volume of fluid medication. The piston assembly includes a finger grip by which the syringe may be advantageously and accurately manipulated by a health care worker using only a single hand to complete both the aspiration and injection steps.
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