Intended Use

The Stone Clear ultrasonic propulsion device is indicated for the repositioning of residual stone fragments post-lithotripsy that are located in the upper urinary tract of adult patients to facilitate passage, where any individual fragment is less than or equal to 5 mm.

Technology

The device consists of a commercially available ultrasound imaging system integrated with a proprietary signal generator and therapy probe. The coaxially aligned imaging and therapy probes allow real-time image guidance while delivering focused ultrasound pulses to reposition stones. The system includes specialized software to synchronize imaging and therapy, controlled via a user interface and foot pedal.

Performance

Safety and effectiveness were demonstrated through non-clinical bench testing (acoustic power, targeting accuracy, probe safety), biocompatibility studies, and animal testing showing no tissue injury under worst-case parameters. Clinical trials showed an 83.3% stone passage rate in treated patients compared to 4.5% in controls, with no serious adverse events related to the device. The device met FDA special controls including software validation and electromagnetic compatibility.

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