Temperature estimation and tissue detection of an ultrasonic dissector from frequency response monitoring
US10955387B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 24, 2019 |
| Grant date | Mar 23, 2021 |
| Priority date | — |
| Expiry date | Dec 24, 2039 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B2017/320095
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An ultrasonic surgical apparatus and method, the apparatus including a signal generator outputting a drive signal having a frequency, an oscillating structure, receiving the drive signal and oscillating at the frequency of the drive signal, and a bridge circuit, detecting the mechanical motion of the oscillating structure and outputting a signal representative of the mechanical motion. The ultrasonic surgical apparatus also includes a microcontroller receiving the signal output by the bridge circuit, the microcontroller determining an instantaneous frequency at which the oscillating structure is oscillating based on the received signal, and determining a frequency adjustment necessary to maintain the oscillating structure oscillating at its resonance frequency, the microcontroller further determining the quality (Q value) of the signal received from the bridge circuit and determining material type contacting the oscillating structure.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.