Platelet aggregation monitoring device
US3989382A · kind A · utility
14Cited by
6References
13Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 22, 1975 |
| Grant date | Nov 2, 1976 |
| Priority date | — |
| Expiry date | Jan 22, 1995 |
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. 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 an optional filter circuit is provided for selectively filtering the difference signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.