An integrated chip for intra-cardiac blood pressure measurement inside the heart of a patient, said integrated chip comprising: a first substantially rigid substrate; at least one pressure sensor disposed within said first substantially rigid substrate to generate signals indicative of a sensed pressure; and electronic signal processing components to process the signals generated by said at least one pressure sensor, said electronic signal processing components being operatively connected to an antenna (14, 28), said integrated chip being powered by a signal received at the antenna (14, 28); wherein said integrated chip is operative to send digital signals indicative of the pressure sensed in the heart telemetrically via an antenna to a remote receiver characterised in that the first substantially rigid substrate has a proximal end and a distal end with the at least one pressure sensor disposed within the distal end thereof; and the integrated chip further comprises a second substantially rigid substrate located opposite said at least one pressure sensor in said first substrate and in a spaced apart configuration, the second substantially rigid substrate defining an aperture positioned over said at least one pressure sensor permitting blood pressure within the heart to act on said at least one pressure sensor; and a flexible filler material located throughout space between said first and second substantially rigid substrates except beneath the aperture, thereby leaving the pressure sensors exposed, such that (a) the flexible filler material connects the second substantially rigid substrate to the first substantially rigid substrate, and (b) the distal end of the first substantially rigid substrate is connected to the second substantially rigid substrate by the flexible filler material. a first substantially rigid substrate; at least one pressure sensor disposed within said first substantially rigid substrate to generate signals indicative of a sensed pressure; and electronic signal processing components to process the signals generated by said at least one pressure sensor, said electronic signal processing components being operatively connected to an antenna (14, 28), said integrated chip being powered by a signal received at the antenna (14, 28); wherein said integrated chip is operative to send digital signals indicative of the pressure sensed in the heart telemetrically via an antenna to a remote receiver characterised in that the first substantially rigid substrate has a proximal end and a distal end with the at least one pressure sensor disposed within the distal end thereof; and the integrated chip further comprises a second substantially rigid substrate located opposite said at least one pressure sensor in said first substrate and in a spaced apart configuration, the second substantially rigid substrate defining an aperture positioned over said at least one pressure sensor permitting blood pressure within the heart to act on said at least one pressure sensor; and a flexible filler material located throughout space between said first and second substantially rigid substrates except beneath the aperture, thereby leaving the pressure sensors exposed, such that (a) the flexible filler material connects the second substantially rigid substrate to the first substantially rigid substrate, and (b) the distal end of the first substantially rigid substrate is connected to the second substantially rigid substrate by the flexible filler material.