The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 01, 1984
Filed:
Dec. 30, 1981
Andreas Hadjicostis, North Brunswick, NJ (US);
Technicare Corporation, Solon, OH (US);
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.