Abstract: An implantable sensor (1) for determining at least one parameter, in particular a physical parameter, comprises a sensor body (3). The sensor body (3) is responsive to the at least one parameter and is configured to yield at least one response signal (SR) upon an interrogation of the sensor body (3) with at least one interrogation signal (SI) comprising acoustic waves. The at least one response signal (SR) is associated with the at least one parameter. The sensor body (3) comprises or consists of at least one material having an ordered structure (4). The at least one response signal (SR) is associated with one or more bulk effects of the at least one material having an ordered structure (4).

Abstract: A mechanical transducer for the detection of acoustic and/or seismic signals is indicated, comprising a continuous or discrete coupled mass-spring network with varying masses and/or spring constants. The mass-spring network is adapted to transform a comparatively small-dimensioned motion parameter of a first mass element into a comparatively large-dimensioned motion parameter of a further mass element. Between the first mass element and the further mass element, the mass-spring network comprises one or more intermediate mass elements, which are coupled to the first mass element and the further mass element by means of spring elements.