Apparatus and method for impedance measurement of body tissues
US4823797A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 15, 1987 |
| Grant date | Apr 25, 1989 |
| Priority date | — |
| Expiry date | Jun 15, 2007 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61N1/36521
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
An apparatus for impedance measurement of body tissue has a signal source which impresses an electrical signal in body tissue, circuitry for acquiring an impedance signal from the body tissue dependent on the impressed electrical signal, and an evaluation stage for evaluating the impedance signal by filtering higher frequency components and low frequency components from the impedance signal which correspond to the conductance of the tissue. A correction stage corrects the high frequency signal components with the low frequency signal components by eliminating the higher frequency signal components of influences due to changes in the tissue conductance. The corrected signal is supplied at an output of the correction stage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.