A low-cost transmittance transducer for measurement of blood oxygen saturation in extracorporeal circuits

IEEE Transactions on Bio-medical Engineering
M R UshizimaI A Cestari

Abstract

Designs for a low-cost dual wavelength transducer based on light transmittance and a disposable cuvette for monitoring oxygen saturation (SO2) in extracorporeal arterial and venous blood are presented. The transducer utilizes red and infrared light-emitting diodes and a large photodiode; it is designed to attach to a flow-through cuvette modified from 3/8-in x3/8-in bypass-circuit connectors. A mock extracorporeal circulation system was assembled to evaluate operation of the transducer at a controlled blood SO2 and the relationship between light transmittance and hemodilution. SO2 was calculated based on multiple linear regression analyses. The results show a high correlation between the SO2 obtained with the equipment designed and values measured with commercial gasometric equipment in the range of 50% to 100% (r2 = 0.976, error <2%). The method presented allows continuous and real time measurement of whole blood SO2 with a low-cost transmittance transducer.

References

Feb 1, 1992·Journal of Cardiothoracic and Vascular Anesthesia·A Baraka
Aug 1, 1986·IEEE Transactions on Bio-medical Engineering·J M Steinke, A P Shepherd
Mar 1, 1986·IEEE Transactions on Bio-medical Engineering·J M Steinke, A P Shepherd
Apr 1, 1967·Physics in Medicine and Biology·N M Anderson, P Sekelj
Nov 1, 1984·IEEE Transactions on Bio-medical Engineering·A P ShepherdG L Riedel

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