Syringe with automatic piston retraction

Details Syringe with automatic piston retraction Syringe with automatic piston retraction

1986-12-18

1988-05-17

Rosenbaum, C. Fred

Surgery

Means for introducing or removing material from body for...

Treating material introduced into or removed from body...

604168, 604900, 604220, A61M 5315

Patent

active

047447915

ABSTRACT:
The syringe is of the aspirating type and comprises a transparent barrel, having an outlet spout for mounting a hypodermic needle at one end and fully open at its opposite end. A partition separates the barrel into a shorter and a longer chamber, the latter for containing the liquid to be injected. A plunger assembly has a piston rod slidable through the partition. A rubber sleeve, surrounded by a casing, is frictionally, slidably mounted on the piston rod in the shorter chamber, and a compression coil spring freely surrounds the piston rod between the casing and the partition. A lever plate is pivotable on one of the fingergrips of the barrel between an open position and a closed position, trapping the sleeve, the casing and the spring into the shorter chamber with the spring in compressed condition. Opening of the lever plate immediately before injection automatically induces partial retraction of the plunger assembly. Any release of the pushing pressure on the plunger during injection also allows the coil spring to partially retract the plunger.

REFERENCES:
patent: 2526365 (1950-10-01), Jorgensen
patent: 3307548 (1967-03-01), Kachergis
patent: 3583399 (1971-06-01), Ritsky
patent: 3618603 (1971-11-01), Levenson
patent: 3669111 (1972-06-01), Dubner
patent: 4333458 (1982-06-01), Margulies et al.
patent: 4518385 (1985-05-01), Lindmayer et al.

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