Venting, automatic-stopping, aspirating plungers for syringes

Details Venting, automatic-stopping, aspirating plungers for syringes Venting, automatic-stopping, aspirating plungers for syringes

1986-02-10

1987-04-28

Yasko, John D.

Surgery

Truss

Pad

604190, A61B 500

Patent

active

046605690

ABSTRACT:
The present invention is a syringe plunger stem with band-like sealing means on one end and fingergrip means on the opposite end and being slidably and sealably insertable into the body of a syringe to variate the volume capacity of the chamber of said syringe. In the plunger there is a capillary action view-tube, positioned in constant sealing contact with the said band-like sealing means and extending longitudinally towards said fingergrip end of said plunger. Further, an air-permeable, liquid impervious porous material is positioned in the said capillary action view-tube that is nearest the said fingergrip end of the plunger. The said capillary action view-tube communicating with and positioned between the said chamber of said syringe and the said air-permeable, liquid impervious porous material. The present invention may also provide a secondary chamber area in the plunger.

REFERENCES:
patent: 4327745 (1982-05-01), Ford, Jr.
patent: 4361155 (1982-11-01), Anastasio
patent: 4373535 (1983-02-01), Martell
patent: 4572210 (1986-02-01), McKinnon

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