A - Human Necessities – 61 – M
Patent
A - Human Necessities
61
M
309/28
A61M 5/14 (2006.01) A61M 5/44 (2006.01) G05D 23/24 (2006.01) H05B 3/00 (2006.01)
Patent
CA 1082275
BLOOD WARMING APPARATUS Robert J. Froehlich Daniel B. Granzow ABSTRACT OF THE DISCLOSURE 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 main- tain 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.
276784
Froehlich Robert J.
Granzow Daniel B. Jr.
Baxter Travenol Laboratories Inc.
Bereskin & Parr
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