04167663 is referenced by 109 patents and cites 10 patents.

An apparatus for warming blood and other parental fluids as they are infused through a disposable flow system includes a pair of heating elements which heat the blood as it passes through a warming bag provided in the flow system. The heating elements are recurringly switched on and off with a duty cycle dependent on both the temperature of the blood at the output of the warming bag, and the temperature differential between the output and input of the bag to maintain the blood at a predetermined temperature independent of flow rate. A duty cycle alarm circuit senses current supplied to the heating elements and trips the main circuit breaker of the apparatus to terminate operation in the event current is continuously applied over a predetermined interval of time, and temperature range and door alarm circuits sound an alarm if the output temperature of the blood falls outside of a predetermined range or if the operator attempts to remove the warming bag from the apparatus while the apparatus is in operation.

Title
Blood warming apparatus
Application Number
5/761926
Publication Number
4167663
Application Date
January 24, 1977
Publication Date
September 11, 1979
Inventor
Robert J Froehlich
Mt. Prospect
IL, US
Daniel B Granzow Jr
Arlington Heights
IL, US
Agent
George H Gerstman
Paul C Flattery
Henry W Collins
Assignee
Baxter Travenol Laboratories
IL, US
IPC
H05B 1/02
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