Platelet aggregation monitoring device
US4135818A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 9, 1976 |
| Grant date | Jan 23, 1979 |
| Priority date | — |
| Expiry date | Jul 9, 1996 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N33/4905
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A difference amplifier continuously generates a signal representing the difference between the optical densities of a platelet rich and a platelet poor sample of blood plasma. If this signal lies within a predetermined range, a variable gain amplifier multiplies the difference signal by a factor which is proportional to the initial difference signal. Electronic circuitry automatically determines the multiplying factor by comparing the initial difference signal to a predetermined magnitude. The multiplied difference signal is continuously recorded on a chart recorder and is displayed as a percentage of aggregation on a digital display. An optional filter circuit is provided for selectively filtering the difference signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.