The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 31, 1993
Filed:
Nov. 22, 1991
Thomas Viebach, Pischertshofen, DE;
Dornier Medizintechnik GmbH, , DE;
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.