Design of pulse oximeter

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Dr. Benesóczky Zoltán
Department of Measurement and Information Systems


My diploma theme is about Pulse-Oximeter design and build. The Pulse-Oximeter is a medical device, which allows monitoring oxygen saturation. By monitoring the oxygen saturation, the condition of hypoxia becomes detectable. The body needs oxygen, a few minutes without oxygen may cause serious brain damage, if the condition of hypoxia doesn’t change, it leads to the patient’s death. Because of these serious effects, the main fields of Pulse-Oximeter use are hospital and home use. There are two ways of measuring the oxygen saturation, the invasive and the non-invasive way. During the invasive measurement the devic0e determine the current oxygen saturation from blood sample with the help of blood gas analysis. During the non-invasive method the device determine the oxygen saturation with the help of a sensor. In this project I designed and built a non-invasive Pulse-Oximeter. The purpose of the project is to design a cheap Pulse-Oximeter for home use. This cheap device would allow the widely use of home Pulse-Oximeters.

In the first part of the project I did research in the topic of oxygen saturation measurement. The research consists of two phases. In the first phase I studied the physiological theory of oxygen saturation measurement. In the second phase I studied the non-invasive methods of oxygen saturation measurement.

In the planning part, I designed the measurement system in detail. I used a system development model (V-model) to help the design process. I used the V-model because of the strict deadlines and complex requirements. With the help of the model, I was able to design the hardware and software system plan.

In the last part, I present the complete system, I analyze the system and I make suggestions how would be the system better.


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