Apparatus and method for indicating cardiac output
US9155482B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 4, 2009 |
| Grant date | Oct 13, 2015 |
| Priority date | — |
| Expiry date | Aug 29, 2030 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61N1/3925
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
An apparatus for indicating cardiac output comprises means for monitoring a patient's transthoracic impedance and generating a corresponding impedance signal, and signal processing means for (a) deriving a signal S1 which is a measure of the average amplitude of the impedance signal, (b) filtering the impedance signal at a plurality of different wavelengths within a predetermined frequency band, (c) for each filter deriving a signal S2 which is a measure of the average amplitude of the respective filter output, (d) calculating the ratio of the maximum one of the signals S2 derived from step (c) to the signal S1 derived from step (a), and (e) using the ratio from step (d) in a decision tree to provide a signal indicating cardiac output or not.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.