ECG enhancement by adaptive cancellation of electrosurgical interference
US4537200A · kind A · utility
285Cited by
5References
11Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jul 7, 1983 |
| Grant date | Aug 27, 1985 |
| Priority date | — |
| Expiry date | Jul 7, 2003 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B5/316
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A technique utilizing a combination of adaptive noise cancelling and conventional signal processing is developed to enhance electrocardiographic monitoring in the operating room by reducing the noise interference that is created by an electrosurgical instrument. Significant amounts of interference are eliminated by radio frequency shielding, passive and active lowpass filtering and optical isolation. A digital adaptive canceller using the least-mean-square algorithm is used to reduce the remainder of the interference, yielding an improvement in signal-to-noise ratio of approximately 100 dB.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.