Abstract: The invention relates to an implantable pressure sensor for measuring pressure, comprising a hermetic capsule (3) with a partially flexible portion; an electronic circuit (4) housed in the capsule (3) generating a transduction pressure signal dependent on the absolute pressure outside the capsule (3); an electrode pair (5, 5?) connected to the electronic circuit (4). The electronic circuit (4) comprises: a digital control unit (29); an interrogation stage (25) receiving an interrogation signal transmitted by volume conduction to the electrode pair (5, 5?), to generate a transduction pressure signal and to transmit it to a medium (15); and a power transferring stage (9) receiving part of the interrogation signal power and transferring power to the digital control unit (29) and to the interrogation stage (25). The invention further comprises a system comprising one or more pressure sensors and a reading unit; and the method for interrogating and powering said system.

Abstract: The invention refers to an implantable sensing system comprising an electronic implant and a reading unit to obtain measurements originating at the implant or its surroundings to characterize physical and/or chemical clinical parameters of a living body. The electronic implant comprises an electronic circuit and at least two electrodes connected to the electronic circuit. The electronic circuit comprises a capacitor and a device of asymmetric conductance capable of rectifying an alternating current, both connected in series between two electrodes. An electronic component is connected in parallel with the device of asymmetric conductance, for the capacitor discharge. The capacitor, the device of asymmetric conductance and/or the electronic component, can be a transducer selected such as an operational parameter of the transducer is variable depending on a physical and/or chemical condition of a medium of a living body.