Ultrasound transducer with focused ultrasound refraction plate
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United States of America Patent
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Feb 23, 1999
Grant Date -
N/A
app pub date -
Mar 17, 1997
filing date -
Mar 17, 1997
priority date (Note) -
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Abstract
A system for performing surgery by vibrational heating employs an ultrasonic transducer 80 for focusing a spherical ultrasound wave on a focal region. In one embodiment a refraction plate 410 having a spherical surface facing the transducer and a refracting surface with refracting pyramid elements 450 facing the subject causes the ultrasound beam to impinge on a plurality of overlapping focal regions and thereby expand the focal area of the transducer. In a second embodiment the refraction plate comprises a phased lens 600 having a constant thickness at any angular location but with its thickness varying linearly over 2.pi. radians or multiples thereof.
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