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An implant now under development could include a blood pressure sensor, about 1-mm dia. including its casing, that takes measurements about 30 times per sec. "A doctor would introduce the pressure sensor directly into the femoral artery in the groin," says Hoc Khiem Trieu of the Fraunhofer Institute for Micro-electronic Circuits and Systems IMS in Duisburg, Germany. The sensor is connected by flexible microcable to an implanted transponder. The transponder digitizes and encodes data coming from the microsensor and transmits it to an external reading device that a patient can wear like a cell phone on his belt. From there, readings are forwarded to a ...