Patent ID: 11937975
Assignee: BIOSENSE WEBSTER (ISRAEL) LTD.
Field: Medical technology (Instruments)
Classification: CPC A  G | IPC A

Claim 11:
12. A method comprising:
inserting a catheter into an intra-body cavity of a patient, the catheter comprising an ultrasonic transducer array including a plurality of multi-frequency ultrasonic transducers;
transmitting a wide beam ultrasonic signal and a narrow beam ultrasonic signal from each of the plurality of multi-frequency ultrasonic transducers, wherein the wide beam ultrasonic signal has a lower frequency than the narrow beam ultrasonic signal;
receiving wide beam echo signals in response to the wide beam ultrasonic signal and narrow beam echo signals in response to the narrow beam ultrasonic signal;
time-aligning at least one of the received wide beam echo signals and at least one of the received narrow beam echo signals; and
identifying free space of the intra-body cavity by determining whether a minimum of a combination of the time-aligned signals is below a threshold.