Impedance cardiograph apparatus and method
US5505209A · kind A · utility
115Cited by
8References
16Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jul 7, 1994 |
| Grant date | Apr 9, 1996 |
| Priority date | — |
| Expiry date | Jul 7, 2014 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B5/0535
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
An impedance cardiograph which determines cardiac output from a measurement of variations of chest impedance, provides an improved method of calculating the effect of patient volume on the measurement from measurable patient height and chest circumference, and provides a correction process that identifies as a source of error variations in the first derivative of impedance. This latter source of error is minimized by preprocessing the impedance derivative value with a compression function which reduces the range of values of the impedance derivative when that value differs significantly from a norm of the population.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.