A - Human Necessities – 61 – B
Patent
A - Human Necessities
61
B
349/36
A61B 10/00 (2006.01) A61B 8/00 (2006.01) G10K 11/02 (2006.01) G10K 11/32 (2006.01)
Patent
CA 1085040
ABSTRACT OF THE DISCLOSURE An ultrasonic transducer system for use with tissue is shown, which system includes a container of liquid acoustic coupling medium within which focused transducer means are located. Focus- ing of the transducer means may be effected acoustically, as by use of an acoustic lens, and/or electronically, as by use of a transducer array. The liquid medium container is closed at one end by a rigid acoustically transparent window, or diaphragm, for acoustically coupling to the skin and underlying tissue of the subject under investigation. The material of the liquid acoustic coupling medium is selected so that the velocity of propagation of acoustic waves therein is substantially less than the velocity of the acoustic waves within the tissue under investigation. By using a low speed-of-sound coupling medium a shorter propagation path may be employed than is required by prior art transducer arrangements in which the speed-of-sound in the tissue and coupling fluid is substantially the same. Operation in either scanning or non-scanning modes is contemplated, and scanning, when employed, may be effected mechanically or electronically. In the sector scanning mode, the system may be operated in a manner such that the angular sector swept out by the focused beam in the tissue exceeds that in the low speed-of-sound liquid coupling medium as a result of refraction at the window interfaces.
274246
Green Philip S.
Gowling Lafleur Henderson Llp
Sri International
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