Portable drug delivery device including pump with tapered barrel

Details Portable drug delivery device including pump with tapered barrel Portable drug delivery device including pump with tapered barrel

1989-12-28

1991-03-05

Yasko, John D.

Surgery

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

Treating material introduced into or removed from body...

604135, 604246, 128DIG12, A61M 100

Patent

active

049974203

ABSTRACT:
A portable drug delivery device for delivering a drug in liquid or fluid form at a constant and self-regulated rate to a patient comprises a syringe having spring loaded piston reciprocal in a cylinder having a reverse taper to pressurize the drug to be dispensed. The reverse taper on the cylinder results in decreasing friction on the piston as the piston moves in the cylinder during a dispensing cycle, and is designed to compensate for the decreasing force exerted on the piston by the expanding spring. A length of tubing connected to the syringe conveys the drug to a needle or other device for administering the drug to a patient, and a restrictor in the length of tubing impedes flow of the drug to achieve a desired flow rate. The restrictor may be sized to achieve any desired flow rate, and in a preferred form of the invention comprises a laser-burned hole in a fitting attached to the outlet end of the length of tubing.

REFERENCES:
patent: 3245591 (1966-04-01), Kneusel et al.
patent: 3451393 (1969-06-01), Sarnoff
patent: 4210173 (1980-07-01), Choksi et al.
patent: 4615694 (1986-10-01), Raines
patent: 4741733 (1988-05-01), Winchell et al.
patent: 4813937 (1989-03-01), Vaillancourt

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