Surgical generator method for controlling and ultrasonic transducer waveform for ultrasonic and electrosurgical devices
US10265117B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 18, 2015 |
| Grant date | Apr 23, 2019 |
| Priority date | — |
| Expiry date | Sep 11, 2036 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01R2201/12
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A method for controlling a waveform shape of a motional branch current in an ultrasonic transducer of a surgical device. The method may comprise generating a transducer drive signal by selectively recalling, using a direct digital synthesis (DDS) algorithm, drive signal waveform samples stored in a look-up table (LUT), generating samples of current and voltage of the transducer drive signal when the transducer drive signal is communicated to the surgical device, determining samples of the motional branch current based on the current and voltage samples, a static capacitance of the ultrasonic transducer and a frequency of the transducer drive signal, comparing each sample of the motional branch current to a respective target sample of a target waveform to determine an error amplitude, and modifying the drive signal waveform samples stored in the LUT such that an amplitude error between subsequent samples of the motional branch current and respective target samples is reduced.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.