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:
Jul. 13, 2004
Filed:
Apr. 16, 2003
Tomohisa Sakurai, Sagamihara, JP;
Yoshitaka Honda, Tokorozawa, JP;
Kazue Tanaka, Sagamihara, JP;
Hiroo Ono, Hino, JP;
Hiroyuki Takahashi, Akishima, JP;
Olympus Corporation, Tokyo, JP;
Abstract
An ultrasonic operation system includes a handpiece having an ultrasonic transducer, which treats a living tissue using ultrasonic oscillations. The system includes a driving signal oscillator for producing a driving signal for driving the ultrasonic transducer and supplying the driving signal to the handpiece; a sweep circuit for sweeping a frequency of the driving signal; a data transfer circuit for transferring start frequency data to the sweep circuit to start sweeping the frequency of the driving signal; a detection circuit for detecting a resonance frequency of the handpiece based on the driving signal of which the frequency has been swept by the sweep circuit; and a chase lock loop (PLL) circuit for locking the frequency of an output current onto the resonance frequency; and, a switch for switching between the PLL circuit and the sweep circuit according to a detection result from the detection circuit.