Patent ID: 11969230
Assignee: VESSELSENS GMBH
Field: Medical technology (Instruments)
Classification: CPC A | IPC A

Claim 0:
1. A pressure wave measuring device comprising a passive transponder system and a reader unit,
wherein the passive transponder system comprises
a first conductor loop structure having at least one turn,
a second conductor loop structure having at least one turn,
a first capacitive pressure sensor,
a second capacitive pressure sensor,
wherein the first capacitive pressure sensor is electrically coupled to the first conductor loop structure to form a first resonant circuit with a first resonant frequency,
wherein the second capacitive pressure sensor is electrically coupled to the second conductor loop structure to form a second resonant circuit with a second resonant frequency,
wherein the at least one turn of the first conductor loop structure is wound around at least one first turn axis,
wherein the at least one turn of the second conductor loop structure is wound around at least one second turn axis, and
wherein the at least one first turn axis and the at least one second turn axis are at a non-vanishing angle to one another,
wherein the reader unit has a reader coil which can be arranged relative to the passive transponder system in such a way that a magnetic field generated by said reader coil passes through at least one of the conductor loop structures of the transponder system,
the pressure wave measuring device further comprising evaluation electronics, by means of which a signal that excites the resonant circuits can be applied to the reader coil and a signal received from the reader coil can be evaluated,
the pressure wave measuring device further comprising a first mixer and a first low-pass filter arranged behind the first mixer, wherein a signal with the first resonant frequency that is received by the reader coil from the transponder system can be downmixed by means of the first mixer, and further comprising
a further mixer and a second low-pass filter arranged behind the further mixer, wherein a signal with the second resonant frequency that is received by the reader coil from the transponder system can be downmixed by means of the further mixer,
wherein the pressure wave measuring device is designed to constructively add a signal output from the first low-pass filter to a signal output from the second low-pass filter, or
wherein the pressure wave measuring device is configured to separate a signal generated by the first low-pass filter into amplitude and phase and to separate a signal output from the second low-pass filter into amplitude and phase, and is further designed to add the amplitude separated from the signal generated by the first low-pass filter to the amplitude separated from the signal generated by the second low-pass filter.