Design and implementation of a sigma delta technology based pulse oximeter's acquisition stage

ROSSI, E E; PEÑALVA, A; SCHAUMBURG, F

Journal of Physics: Conference Series

IOP Science

Lugar: Istres; Año: 2011 vol. 332

Pulse oximetry is a widely used tool in medical practice for estimating patient?s fraction of hemoglobin bonded to oxygen. Conventional oximetry presents limitations when changes in the baseline, or low amplitude of signals involved occur. The aim of this paper is to simultaneously solve these constraints and to simplify the circuitry needed, by using Sigma-Delta technology. For this purpose, a board for the acquisition of the needed signals was developed, together with a PC managed software which controls it, and displays and processes in real time the information acquired. Also laboratory and field tests where designed and executed to verify the performance of this equipment in adverse situations. A simple, robust and economic instrument was achieved, capable of obtaining signals even in situations where conventional oximetry fails.