Pump-type syringe having double-acting piston construction

Details Pump-type syringe having double-acting piston construction Pump-type syringe having double-acting piston construction

1974-09-13

1976-05-18

Trapp, Lawrence W.

Surgery

Respiratory method or device

Ozone or ion generation

A61M 100

Patent

active

039570517

ABSTRACT:
A fluid-transfer syringe for medical usage wherein, by use of such syringe, fluid matter may be removed from an afflicted area, such as a knee, of a patient. The spring-loaded plunger of the subject syringe is provided with a piston constructed to have an automatic fluid bypass during forward strokes. The piston serves thereby as a double-acting piston for both drawing into the area forwardly of the piston the fluid to be expelled and, simultaneously, pumping previously expelled fluid from the syringe barrel to a provided outlet port.

REFERENCES:
patent: 657440 (1900-09-01), McCaw
patent: 1444714 (1923-02-01), Teshima
patent: 1624990 (1927-04-01), Smith

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