Ultrasonic operation apparatus for performing follow-up control of resonance frequency drive of ultrasonic oscillator by digital PLL system using DDS (direct digital synthesizer)
US6761690B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 16, 2003 |
| Grant date | Jul 13, 2004 |
| Priority date | — |
| Expiry date | Apr 16, 2023 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B2017/320082
- WIPO fieldMedical technology
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.