Compensation of motion artifacts in capacitive measurement of electrophysiological signals
US8515532B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 24, 2009 |
| Grant date | Aug 20, 2013 |
| Priority date | — |
| Expiry date | Nov 13, 2029 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B5/7214
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
The invention relates to a system and a method in which an electrophysiological signal is sensed capacitively with at least two closely spaced electrodes such that the electrodes experience strongly correlated skin-electrode distance variations. To be able to derive a motion artifact signal, the capacitive coupling between the electrodes and skin is made intentionally different. With a signal processing means the motion artifact signal can be removed from the measured signal to leave only the desired electrophysiological signal. Since the measured quantity is dependant on the electrode-skin distance itself, the system and method do not need to rely on the constancy of a transfer function. Hereby, they give reliable motion artifact free output signals.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.