CPC A61B 8/0841 (2013.01) [A61B 5/065 (2013.01); A61B 8/4494 (2013.01); A61B 90/98 (2016.02)] | 6 Claims |
1. A system for performing a medical procedure in a region of interest of a patient, the system comprising:
an interventional medical device insertable into the region of interest;
a passive sensor attached to a portion of the interventional medical device, the passive sensor configured to convert an ultrasonic wave received from an ultrasound imaging probe to a corresponding electrical radio frequency (RF) signal,
wherein the passive sensor comprises:
(i) a radio frequency identification (RFID) chip configured to convert the ultrasonic wave to the RF signal, wherein the converted RF signal is generated to contain information indicating the conversion from the ultrasonic wave, the RFID chip comprising:
a transition area configured to perform mode conversion that transforms the ultrasonic wave, which is a longitudinal ultrasound wave, to a corresponding surface acoustic wave, and
a surface acoustic wave (SAW) resonator having an electronic resonator circuit tuned to a resonance frequency, the SAW resonator configured to convert the corresponding surface acoustic wave to the RF signal by resonating the SAW resonator at the resonance frequency, and
(ii) a local antenna configured to transmit the RF signal external to the region of interest of the patient;
an RF receiver located external to the region of interest of the patient, the RF receiver configured to detect the RF signal transmitted by the local antenna of the passive sensor; and
a processor configured to determine a location of the passive sensor within the region of interest based on a delay between (i) receipt of the ultrasonic wave at the RFID chip and (ii) detection of the RF signal by the RF receiver.
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