Shockwave generator having an ultrasound applicator shielded fro

Details Shockwave generator having an ultrasound applicator shielded fro Shockwave generator having an ultrasound applicator shielded fro

1991-01-28

1993-07-20

Smith, Ruth S.

Surgery

Truss

Pad

128 24EL, A61B 1722

Patent

active

052284476

ABSTRACT:
A shockwave generator for extracorporeal lithotripsy has a housing filled with an acoustic propagation medium, through which shockwaves propagate, and in which an ultrasound applicator is disposed for locating a calculus to be treated. The ultrasound applicator has components which may be damaged if traversed by shockwaves. At least a portion of the ultrasound applicator in which these components are disposed is therefore acoustically shielded with a substance having an acoustic impedance substantially differing from the acoustic impedance of the propagation medium, so that essential parts of the shockwaves are reflected thereby and thus the non-reflected parts do not reach the shielded portion of the ultrasound applicator with sufficient energy to damage the compartments.

REFERENCES:
patent: 4620545 (1986-11-01), Shene et al.
patent: 4674505 (1987-06-01), Pauli et al.
patent: 4844081 (1989-07-01), Northeved et al.
patent: 4928672 (1990-05-01), Grasser et al.

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