04921480 is referenced by 31 patents and cites 4 patents.

In a gravity feed intravenous fluid delivery system, a fixed volume metering valve having an upwardly spring biased fluid-measuring piston that is also downwardly pressure biased and is effective to cause the dispensing of a fixed volume of intravenous fluid for each up and down cycle of piston movement, characterized by a cyclically operated clamp on the delivery tube of the system which, when the clamp is closed, allows the spring bias to lift the piston in ascending movement and, when in an open clamp condition, causes the pressure to urge the piston in descending movement, to thereby produce said up and down piston movement which cyclically dispenses the fixed volume of intravenous fluid.

Fixed volume infusion device
Application Number
Publication Number
Application Date
November 21, 1988
Publication Date
May 1, 1990
Andrew I Sealfon
Rte. #3, Box 61, Middletown, 10940
A61M 31/00
View Original Source