Short ring down, ultrasonic transducer suitable for medical appl

Details Short ring down, ultrasonic transducer suitable for medical appl Short ring down, ultrasonic transducer suitable for medical appl

1981-12-30

1984-05-01

Kamm, William E.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

310334, 310336, 128660, H01L 4108, A61B 1000

Patent

active

044463952

ABSTRACT:
A highly efficient piezoelectric transducer suitable for medical applications is disclosed which exhibits a 40 db ring down time of less than 3 cycles, that is, of less than 0.7 microsecond at 4.2 MHz. The subject transducer comprises a single crystal lithium niobate active element which is supported on a formed backing material which is lapped to a surface flatness of better than 0.0002 inches (0.0015 cm). The subject transducer, which is designed to be driven at 4.2 MHz further comprises a first matching layer having an impedance of 6.8-7.4.times.10.sup.6 kg/m.sup.2 sec and a second matching layer having an impedance of between 1.8-2.4.times.10.sup.6 kg/m.sup.2 sec. An alternate embodiment dual-power transducer is also disclosed which is suitable for operating at different power levels to selectively image or produce lesions in selected body tissues.

REFERENCES:
patent: 4101795 (1978-07-01), Fukumoto et al.
patent: 4240003 (1980-12-01), Larson
patent: 4277711 (1981-07-01), Hanafy

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