The pulse oximeter’s operationĪ pulse oximeter continuously measures the percentage of a patient’s hemoglobin (Hgb), hemoglobin saturated with oxygen (HbO 2), and pulse rate. It then describes how to get a design off the ground using a reference design that combines well-matched elements in a practical configuration. It introduces the critical elements of that chain, including the use of a dark current compensation diode. This article discusses the requirements of the detection signal conditioning chain for a wearable pulse oximeter. The use of pre-existing designs lowers overall cost while ensuring a maximum chance of a successful design. There are also problems of cost and power consumption.Īs a result, it can be challenging to get the photosensor to detect high and low signals accurately.įor many designers, the best path forward is to avoid reinventing the wheel and use existing circuits. On the detection side, these variables include the signal conditioning elements necessary to achieve optimum sensitivity, dynamic range and bandwidth, as well as dealing with dark current from the PIN diode. While the technique is well understood, an accurate reading can be difficult to achieve as it depends upon many variables. ![]() ![]() The techniques rely upon the transmission and detection of LED light through a translucent part of the body, typically the finger. The wearable pulse oximeter is a noninvasive medical device that measures blood oxygen saturation and pulse rate.
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