Plunger subassembly for blood gas syringes

Details Plunger subassembly for blood gas syringes Plunger subassembly for blood gas syringes

1983-06-20

1984-08-21

Howell, Kyle L.

Surgery

Truss

Pad

604125, 604190, 604236, A61B 514

Patent

active

044664460

ABSTRACT:
This invention relates to an improved plunger subassembly for use in a blood gas syringe barrel characterized by a pushrod having a piston on its front end with a hollow interior defining a fluid collection chamber communicating with both the front and rear ends thereof by passageways blocked by a filter that will pass gases but is impervious to fluids. With the plunger subassembly in its passive state, blood and gas entering the syringe barrel from the front is free to enter the collection chamber by means of slits on the periphery of the piston at its front end. The contaminated blood that has been in contact with the air originally in the syringe barrel is trapped in the fluid collection chamber inside the piston while the gases pass on through the filter and are vented to the atmosphere. Opposed surfaces on the pushrod and piston cooperate to define an air-tight seal effective to prevent the flow of air past the piston when the plunger subassemlby is actuated to retract same.

REFERENCES:
patent: 1924916 (1933-08-01), Drake
patent: 3943917 (1976-03-01), Johansen
patent: 4326540 (1982-04-01), Bailey et al.
patent: 4327745 (1982-05-01), Ford
patent: 4340067 (1982-07-01), Rattenborg

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