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Drip chamber for intravenous administration

  • US 4,013,072 A
  • Filed: 11/03/1975
  • Issued: 03/22/1977
  • Est. Priority Date: 11/03/1975
  • Status: Expired due to Term
First Claim
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1. In a drip chamber for use in intravenous administration of liquids, comprising an elongated, flexible, transparent hollow housing chamber defining an inlet at one end thereof and an outlet at the other end, said drip chamber being free of venting means, to permit pumping thereof for obtaining and maintaining a constant liquid level therein;

  • hydrophilic filter means positioned adjacent the outlet port, said hydrophilic filter means defining a pore size sufficient to permit the passage of liquid and to prevent the passage of gas, when wetted, under normal conditions of use, said hydrophilic filter means defining a tubular filter structure positioned generally coaxially with said hollow chamber and spaced from the walls thereof, said tubular filter means defining an open end facing the inlet end of said elongated chamber and a closed end facing the outlet end of said elongated hollow chamber, and an annular sealing member adjacent said open end of the tubular filter for sealing the annular space between said tubular filter member and the chamber wall;

    whereby liquid passing through said tubular filter member enters into the bore thereof and passes through said tubular filter to the exterior thereof in the space between said filter and the chamber wall, and thereafter said filtered liquid passes through said outlet port.

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