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A novel implantable surface acoustic wave (SAW) sensor has been developed for blood pressure monitoring. The sensor is a wireless and batteryless microsystem composed of an SAW resonator, an oscillating circuit and an RF power converter. The total volume of the sensor is 1.9cm3 and the weight is 2.5g including its bio-compatible silicone coating. The sensitivity of the sensor is 1.75 KHz/mmHg. In vivo tests have been performed in a rat, showing the capability of the sensor for monitoring the blood pressure of small laboratory animals.