Air inlet filter for burette top
AssigneeB. Braun Medical Inc.
InventorJoel Bartholomew
Life of this patent
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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.
Claims5
A burette top for use with a burette in a medical drainage system, comprising
- a cap having a generally planar circular base transfixed by a short integral tube having an upper portion providing a port to which tubing from a source of fluid may be attached and a lower portion from which fluid can drip into the burette,
- said cap having a tapered skirt extending axially downward from the circumference of the base for engaging the open end of the burette,
- said base being perforated by an array of slots that permit air to enter the burette,
- the base having a substantially flat bottom surface having a shallow annular relief intersecting said slots, and
- a ring-shaped filter disk situated beneath the relief, whereby the relief prevents most of the filter disk from lying flush against the bottom surface of the base.
Dependencies are inferred from the claim text.