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Self-priming intravenous filter

  • US 4,906,260 A
  • Filed: 04/12/1989
  • Issued: 03/06/1990
  • Est. Priority Date: 08/03/1987
  • Status: Expired due to Term
First Claim
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1. An intravenous filter device comprising:

  • a flat, substantially transparent housing and a flat hydrophilic membrane dividing the housing into an inlet chamber and an outlet chamber, each chamber having an outer wall;

    an inlet to the housing for delivering fluid to the inlet chamber;

    an outlet to the housing for delivering fluid from the outlet chamber; and

    at least two vents in the outer wall of the inlet chamber opposite the surface of the hydrophilic membrane, said outer wall of said inlet chamber being parallel to said hydrophilic membrane, the vents comprising a hydrophobic membrane attached to the outer wall of the inlet chamber;

    wherein the vents are compositely large enough to contact air bubbles throughout in the inlet chamber but small enough to provide visibility of the hydrophilic membrane through the housing.

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