Acoustic focussing device
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United States of America Patent
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-
Aug 31, 1993
Grant Date -
N/A
app pub date -
Nov 22, 1991
filing date -
Nov 22, 1990
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The present invention relates to an acoustic focussing device for the focussing of ultrasonic and shock waves, particularly for the no-contact crushing of a concrement disposed in the body of a living being. Several boundary surfaces are arranged behind one another in the propagating direction of the sound waves, in which case adjacent gaps contain liquids of different sound velocities. At least one gap is connected with a non-adjacent gap. At least one of the boundary surfaces is deformable. At least one of the boundary surfaces can be moved in parallel to the propagating direction of the sound waves by means of which movement liquid is displaced between connected gaps and the radius of curvature of at least one of the deformable boundary surfaces is changed.
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