Evaluation of gas transfer performance of Terumo hollow fiber oxygenator(H. F. O) and Nikkiso membrane oxygenator with heat exchanger(N. K. O)

Abstract

Gas transfer performances of H. F. O and N. K. O were evaluated using a testing and evaluation method which was pveviously reported from our laboratory. Gas transfer characteristics of both membrane oxygenators were summerized as follows
1. Both oxygen and carbarn dioxide transfer rates of H. F. O and N. K. O were decreased as blood flow rate increased.
2. The oxygen transfer rates of H. F. O and N.K.O were not changed as oxygen blood flow ratio(V/Q) increased, while carbon dioxide transfer rate of H. F. O was increased lineally until V/Q increased up to 4.0 and that of N. K. O was increased lineally less than 1.0 of V/Q and approached to the constant above 1.0 of V/Q.
3. Optimal membrane indexes and control indexes of H. F. O and N. K. O on the practical operation were discussed.