Designing an extracorporeal deep-hypothermic heat exchanger and optimizing its operating conditions

Author

Mourtada, Firas A. ; Gray, Robert I.

Author_Institution

Dept. of Biomed. Eng., Mercer Univ., Macon, GA, USA

fYear

1992

fDate

12-15 Apr 1992

Firstpage

768

Abstract

A theoretical study altered the tube and fin dimensions of a commercial hypothermic heat exchanger (HE) used in cardiopulmonary bypass during open-heart surgery to obtain an optimized design (OHE). This OHE was then tested analytically by modeling the patient/HE system with a single-pool body assumption, modified to accommodate for body temperature gradients. Simultaneous solution of the body differential and system HE equations, showed that the OHE could provide the clinically desirable cool-down phase within 20 min, and the warm-up within 30 min for a wide range of patient types and cardiac outputs. precise holding phase temperatures also could be obtained, ±0.05°C, through optimal control of the HE´s water inlet temperature

Keywords

biomedical equipment; biothermics; heat exchangers; optimisation; 20 min; 30 min; analytical testing; body temperature gradients; cardiopulmonary bypass; extracorporeal deep-hypothermic heat exchanger; fin dimensions; heat exchanger design; modeling; open-heart surgery; optimal control; optimized design; optimized operating conditions; precise holding phase temperatures; single-pool body assumption; tube dimensions; water inlet temperature; Blood; Cardiology; Cooling; Design optimization; Equations; Heat transfer; Helium; Immune system; Surgery; Temperature;

fLanguage

English

Publisher

ieee

Conference_Titel

Southeastcon '92, Proceedings., IEEE

Conference_Location

Birmingham, AL

Print_ISBN

0-7803-0494-2

Type

conf

DOI

10.1109/SECON.1992.202255

Filename

202255