Abstract: Ultrasonic transducer with a selectable beamwidth comprising a body of piezoelectric material in the form of an annulus having an outer diameter D and a thickness T. The body has proximal and distal generally planar parallel surfaces and a centrally disposed hole extending therethrough. The body has a cylindrical wall with a width W extending from the hole to the outer diameter. The transducer is capable-of operating at low and high resonance frequencies with the low frequency resonance being determined by the diameter D and an aspect ratio of D/T and the high frequency resonance being determined by the thickness T and an aspect ratio of W/T.
Type:
Grant
Filed:
December 2, 1996
Date of Patent:
April 21, 1998
Assignee:
Cardiometrics, Incorporated
Inventors:
Paul D. Corl, Michael C. Pao, Vincent A. Barletta, Victor Chechelski