System and method used to detect or differentiate tissue or an artifact
US11992338B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Dec 27, 2019 |
| Grant date | May 28, 2024 |
| Priority date | — |
| Expiry date | Apr 12, 2041 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B2562/043
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A surgical system includes at least one light emitter and an array of light sensors disposed at the working end of the surgical instrument, individual light sensors in the array of light sensors adapted to generate a signal comprising a non-pulsatile component. The system also includes a controller coupled to the array of light sensors, the controller including an analyzer configured to determine a curve of the non-pulsatile components of the signals of each of the individual light sensors in the array of light sensors, smooth the curve, calculate a derivative of the smoothed curve; invert the smoothed curve, calculate a derivative of the inverted smoothed curve, take a difference between the derivatives, smooth the resultant curve, estimate zero crossings of the smoothed, resultant curve, apply a signum function to points adjacent each zero crossing, if any, and identify a region of interest, if any, based on the result.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.