A reusable, low-cost and self-sufficient sensorbased neonatal pulse oximeter

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Pulse oximeters are non-invasive medical health devices for measuring oxygen saturation and pulse rate of humans. Pulse oximeters used for neonates have been identified to have some limitations in terms of their bulkiness in size, the need for a pulse sensor attachment to a monitoring device to obtain readings and their expensive nature. This project explores a pulse oximeter design to eliminate these limitations and create an accurate alternative for neonatal pulse oximeters. The proposed design includes a pulse sensor and a control and display circuit self-sufficiently powered by a direct current source of voltage. It employs analog signal processing, digital signal processing (DSP) with a low-power but highly efficient microprocessor to ensure accurate values are obtained. The project explores this design but however implemented part of the design (Infrared (IR) sensor) based on the materials and electrical components available. Even though the proposed design was not built as whole, various sections of the design was implemented or simulated and were feasible. The results from the IR sensor built was compared to a commercial pulse oximeter and from the statistical analysis conducted, the two systems have similar readings confirmed by the t-value of 0.917 in the paired t-test. Unfiltered data was used with the algorithm developed and the DSP and the readings for the SpO2 and pulse rate were similar to the commercial oximeter.
Capstone Project submitted to the Department of Engineering, Ashesi University in partial fulfillment of the requirements for the award of Bachelor of Science degree in Electrical and Electronic Engineering, May 2022
medical device