Importance

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Abstract

Disclosed is an ergonomically improved hypodermic syringe which facilitates one-handed use by allowing the same hand that holds the syringe to operate the plunger conveniently to accomplish both the distal (injecting) stroke and the proximal (aspirating) stroke. The syringe includes a pair of finger-stop structures on diametrically opposite sides of the barrel which block slippage in both proximal and distal directions and which do not occupy the barrel's entire circumference and do not interfere with the legibility of a calibration scale that passes through the region of the barrel with which said structures are associated. A loop atop the syringe's plunger member is also provided, which is adjustable to vary the size of the aperture thereof for a snug fit with fingers and thumbs of varying sizes. In combination, the adjustable loop and finger-stops make the syringe plunger easily operable in both directions with one hand. The result is a syringe which is inexpensive to manufacture, which is compact to store and ship, and which enables an aspiration maneuver, to test for the presence of blood indicating that a blood vessel has been penetrated, to be performed easily with one hand.

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First Claim