Syringe device having a vented piston

Details Syringe device having a vented piston Syringe device having a vented piston

1997-05-19

1999-02-02

Stright, Ronald

Surgery

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

Treating material introduced into or removed from body...

604190, 604222, A61M 100, A61M 5315

Patent

active

058658033

ABSTRACT:
A syringe assembly specifically designed to dispense high viscosity material. The syringe assembly includes a syringe barrel into which the high viscosity material is placed. A piston assembly is introduced into the syringe barrel. The piston assembly creates a seal against the interior of the syringe barrel that is impervious to the high viscosity material but is not impervious to the passage of air. Consequently, as the piston assembly is advanced into the syringe barrel, any trapped air is permitted to exit the syringe barrel without passing through the high viscosity material. The piston assembly also contains a shaped piston head that stresses the high viscosity material as it is displaced through the syringe barrel. By stressing the high viscosity material in the syringe barrel before it is dispensed, air bubbles and gaps contained within the material can be greatly reduced. Consequently, as the high viscosity material is dispensed from the syringe assembly, a homogenous mix is produced that contains very few air bubbles and gaps.

REFERENCES:
patent: 3672369 (1972-06-01), Brown
patent: 4030498 (1977-06-01), Tompkins
patent: 4632672 (1986-12-01), Kvitrud
patent: 4846801 (1989-07-01), Okuda et al.
patent: 5125898 (1992-06-01), Kaufhold, Jr. et al.
patent: 5238003 (1993-08-01), Baidwan et al.
patent: 5318536 (1994-06-01), Williams
patent: 5489266 (1996-02-01), Grimard

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