Low friction syringe

Details Low friction syringe Low friction syringe

1994-01-27

1995-03-14

Yasko, John D.

Surgery

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

Treating material introduced into or removed from body...

604230, A61M 5315

Patent

active

053973135

ABSTRACT:
The invention features a low friction syringe which includes a plastic barrel having a circumferential inner surface defining a chamber, a plastic plunger having a distal end received in the barrel chamber, and an elastomeric gasket positioned at the distal end of the plunger and received in the barrel chamber. The gasket comprises a body with forward and rearward ends and first and second annular flanges positioned circumferentially at the forward and rearward ends of the body. The forward flange permits injection to occur. The rearward flange permits aspiration to occur. The flanges are separated by an annular space intermediate the body portion and the barrel inner surface. The gasket also includes an annular projection extending from each flange. Each projection is of reduced thickness relative to the thickness of each flange itself and provides a contact point with the barrel inner surface when the plunger distal end is received in the barrel chamber, thereby enabling reduced frictional contact with the barrel inner surface during forward and rearward movement of the gasket.

REFERENCES:
patent: 2886034 (1959-05-01), Robinson et al.
patent: 3135260 (1964-06-01), Hamilton
patent: 3176595 (1965-04-01), Schwartz
patent: 4212309 (1980-07-01), Moorehead
patent: 4266557 (1981-05-01), Merry
patent: 4405249 (1983-09-01), Scales
patent: 4986820 (1991-01-01), Fischer

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