Removing parasitic effects from body impedance measurements with wrist-worn and/or other devices
US10555686B1 · kind B1 · utility
Inventors
Key dates
| Filing date | Jul 1, 2016 |
| Grant date | Feb 11, 2020 |
| Priority date | — |
| Expiry date | Mar 5, 2038 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R27/02
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
Methods and devices for removing parasitic effects from body impedance measurements. Such parasitic effects can include parasitic coupling(s)/impedance(s) and/or parasitic coupling between the impedance measurement device and the body tissue being measured. In one approach, a drive current is controlled so as to control the voltage of a sense electrode to reduce a parasitic current. In another approach, different known capacitances are added to enable calculation of unknown electrode impedances. In another approach, a positive feedback loop is used to reduce error associated with a parasitic current of a voltage sensor used to measure resulting subject voltage. In another approach, sequential application of drive voltage to each electrode is used and resulting currents through all electrodes are measured and used to calculate body impedance.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.