Surgery – Diagnostic testing – Cardiovascular
Patent
1996-02-21
1998-05-26
Nasser, Robert L.
Surgery
Diagnostic testing
Cardiovascular
600526, 600549, A61B 500
Patent
active
057556709
ABSTRACT:
A system for keeping the surface temperature of an electric resistance-type heater element in a thermodilution catheter within safe physiological limits includes, in the preferred embodiment, a heater element core temperature monitor, a monitor for monitoring the power that is supplied to the heater element, and a surface temperature calculator for calculating the surface temperature of the heater element based on the core temperature, supplied power, and information representing the characteristics of the particular catheter under anticipated clinical conditions. A second aspect of the invention involves a system for determining the supply of power to the heater element based on the core temperature of the heater element. A third aspect of the invention involves a system readiness test for determining, in vivo, that the thermodilution catheter system is properly calibrated before the system is operational. Methods of operation for each of the above-referenced aspects of the invention are also disclosed.
REFERENCES:
patent: 3359974 (1967-12-01), Khalil
patent: 4382504 (1983-05-01), Hori
patent: 4776340 (1988-10-01), Moren et al.
patent: 5214267 (1993-05-01), Hoshi
patent: 5277191 (1994-01-01), Hughes
patent: 5373850 (1994-12-01), Kohno et al.
McKown Russell C.
Quinn Michael D.
Yelderman Mark L.
Baxter International Inc.
Canter Bruce M.
Nasser Robert L.
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