Ultrasound transducer for diagnostic and therapeutic use

Details Ultrasound transducer for diagnostic and therapeutic use Ultrasound transducer for diagnostic and therapeutic use

1997-09-02

1998-10-20

Smith, Ruth S.

Surgery

Diagnostic testing

Detecting nuclear, electromagnetic, or ultrasonic radiation

600459, 601 2, 601 3, 310366, A61B 1722

Patent

active

058239626

ABSTRACT:
An ultrasound transducer for diagnostic and therapeutic generates ultrasound waves of different wavelengths in diagnostics mode or therapy mode. The ultrasound transducer has an n.times..lambda./4 matching layer for a propagation medium adjoining the ultrasound transducer, and a piezoelectric ultrasound transducer element with a first electrode located between the matching layer and the ultrasound transducer element, a second electrode attached at the opposite side of the ultrasound transducer element, and a third electrode that divides the ultrasound transducer element into two regions. Ultrasound waves can be generated for the diagnostics mode and for the therapy mode dependent on the division of the ultrasound transducer element. The n.times..lambda./4 matching layer is effective for the wavelength of the ultrasound waves in diagnostics mode as well as in therapy mode.

REFERENCES:
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patent: 5526815 (1996-06-01), Granz et al.
"High-Intensity Focused Ultrasound Experimentation on Human Benign Prostatic Hypertrophy," Gelet et al., Eur. Urol., vol. 23 (Suppl. 1), 1993, pp. 44-47.
"Intense Focused Ultrasound in Medicine," Fry, Eur. Urol., vol. 23 (Suppl. 1), 1993, pp. 2-7.
"A Dual Frequency Ultrasonic Probe for Medical Applications," Saitoh et al., IEEE Trans. on Ultrasonics, Ferroelectrics and Frequency Control, vol. 42, No. 2, Mar. 1991, pp. 294-300.
"A Novel Acoustic Design for Dual Frequency Transducers Resulting in Separate Bandpass for Color Flow Mapping (CPM)," de Fraguler et al., Proc. IEEE, 1990 Ultrasonics Symposium, pp. 799-803.
"Improving the Characteristics of a Transducer Using Multiple Piezoelectric Layers," Hossack et al., IEEE Trans. on Ultrasonics, Ferroelectrics and Frequency Control, vol. 40, No. 2, Mar. 1993, pp. 131-139.
"Multiple Layer Transducers for Broadband Applications," Hossack et al., Proc. IEEE Ultrasonics Symposium, 1991, pp. 605-611.

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