Wireless and batteryless blood pressure sensor

A low-power invasive blood pressure transducer has been designed. It is based on a structure of four high resistive strain gauges in a full Wheatstone bridge configuration. For obtaining the required sensitivity, the gauge was allocated performing a careful mechanical simulation of the membrane behaviour. The electronic conditioning circuit and the ADC were optimized to compensate the noise introduced by the high resistive gauges. A batteryless RFID tag designed to incorporate and to supply the sensor was fabricated and measured. It power supplies the sensor at a distance longer than 50 cm from a standard reader, while the reported ranges —to the best of our knowledge— are shorter than 10 cm. This wireless and batteryless sensor is especially suitable for surgery rooms and intensive care units.

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