Perfusion meter
US4109643A · kind A · utility
60Cited by
13References
3Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 17, 1976 |
| Grant date | Aug 29, 1978 |
| Priority date | — |
| Expiry date | Jun 17, 1996 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B5/14552
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A perfusion meter comprising a hand-held battery operated optical plethysmograph displays an indication of blood flow rate in response to the time-varying optical transmission characteristics of an ear or other organ. This indication, called the perfusion index, is proportional to both the amplitude and frequency of variations in the dynamic optical transmission characteristics of the ear or other organ.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.