Air inlet filter for burette top

Details Air inlet filter for burette top Air inlet filter for burette top

1993-09-03

1995-08-01

Rosenbaum, C. Fred

Surgery

Container for blood or body treating material, or means used...

Filter or series thereof for liquid entering or leaving...

604252, 141392, 141286, 210406, 210472, A61B 1900

Patent

active

054376556

ABSTRACT:
A burette top vent which resists air blockage includes a peripherally skirted cap having a generally planar circular base transfixed by a short integral tube having an upper portion to which tubing from a source of fluid may be attached and a lower portion from which fluid can drip into the burette. The base is perforated by an array of arcuate slots that permit air to enter the burette, and the bottom surface of the base has a shallow annular relief intersecting the slots. A ring-shaped hydrophobic filter disk hermetically affixed beneath the relief. The relief prevents the filter disk from lying flush against the bottom surface of the base.

REFERENCES:
patent: 3726795 (1973-04-01), Edwards
patent: 4092246 (1978-05-01), Kummer
patent: 4262671 (1981-04-01), Kersten
patent: 4343305 (1982-08-01), Bron
patent: 4453927 (1984-06-01), Sinko
patent: 5141639 (1992-08-01), Kraus et al.
patent: 5201722 (1993-04-01), Moorehead et al.
Cordis Brochure, Apr. 1989.

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