Title:
【発明の名称】ビーム幅を選択できる超音波トランスジューサ及び方法
Document Type and Number:
Japanese Patent JPH09508242
Kind Code:
A
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.
Inventors:
Cole Paul Dee
Yurt michael sea
Barretta Vincent A
Chechersky Victor
Yurt michael sea
Barretta Vincent A
Chechersky Victor
Application Number:
JP51857795A
Publication Date:
August 19, 1997
Filing Date:
January 05, 1995
Export Citation:
Assignee:
Cardiometrics Incorporated
International Classes:
G01N29/24; A61B8/00; B06B1/06; G01S7/521; H01L41/09; H04R17/00; A61B8/06; A61B8/12; (IPC1-7): H04R17/00; A61B8/00; G01N29/24; G01S7/521; H01L41/09; H04R17/00
Attorney, Agent or Firm:
Minoru Nakamura (7 outside)