[Focusing a spherical acoustic pulse with an elliptic reflector in a medical device for non-invasive crushing of renal calculi].
In developing medical device for transcutaneous destruction of renal stones in patients suffering from nephrolithiasis we have encountered some problems concerning the focusing of sound pulses. On the assumption of the linear diffraction theory the pressure pattern is computed that is produced when sound pulses are emitted by a source in the vicinity of the elliptic reflector focal point. Pressure pattern and wave-front shape versus radiator displacements off the focal point are studied. Radiator displacement is shown to have a marked effect on pressure amplitude and distribution within the area. Thus, a correcting acoustic lens should be mounted close to the reflector aperture.
D006801:Humans; D007669:Kidney Calculi / Q000628:therapy*; D014464:Ultrasonic Therapy / Q000295:instrumentation*
Fokusirovanie sfericheskogo zvukovogo impul'sa éllipticheskim reflektorom v meditsinkoĭ ustanovke dlia beskontaktnogo drobleniia pochechnykh kamneĭ.