Syringe actuation device

Details Syringe actuation device Syringe actuation device

1997-01-30

1998-09-01

Yasko, John D.

Surgery

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

Treating material introduced into or removed from body...

604135, 604246, A61M 500

Patent

active

058004050

ABSTRACT:
A syringe actuation device includes a housing containing a spring-biased piston that applies an actuation force to a syringe plunger inserted into the housing. A pivoting mechanism causes the piston to pivot with respect to the longitudinal axis of the housing as the piston moves along that axis to actuate the plunger, whereby the axially-directed component of the force applied by the piston to the plunger remains substantially constant throughout the stroke of the piston. In one embodiment, the device comprises an internally-threaded outer sleeve having a longitudinal opening for receiving a pre-filled syringe with an extended plunger and a distal opening through which the syringe barrel extends, and an externally-threaded cylinder, containing the piston, that threads into the proximal end of the sleeve so as to bring the piston to bear against the plunger. The pivoting mechanism comprises a tapered internal diameter of the cylinder, and a sloped spring seat on the piston. In another embodiment, the device comprises a housing that contains a piston biased by a pair of springs, and a sleeve that receives a syringe barrel, with the plunger of the syringe extending from the proximal end of the sleeve. The proximal end of the sleeve is inserted into the housing through an opening in the distal end wall of the housing, so that the plunger seats against the piston. The pivoting mechanism comprises a narrowing internal housing width and springs of unequal spring constant and/or length.

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