Disposable extracorporeal conduit for blood constituent monitoring
US5456253A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 27, 1994 |
| Grant date | Oct 10, 1995 |
| Priority date | — |
| Expiry date | Sep 27, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2021/036
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A disposable cuvette through which to pass pulsatile flowing blood. The cuvette has a conduit with two opposed walls having a predetermined separation therebetween that varies with each pulse of the flowing blood. A sealed air pocket damps the variation of the predetermined separation. The conduit is comprised of materials which permit passage therethrough of wavelengths of selected electromagnetic radiation. The radiation is emitted from a photoemitter which, and after passing through the cuvette, is detected by a photodetector. The quantities of detected radiation are operated on by a computer which uses a spectrophotometry technique to derive therefrom a blood constituent concentration value. Preferably, both cuvette and spectrophotometry technique are used during hemodialysis to derive changes in the hematocrit value of the blood of a dialyzed patient, thereby to deduce therefrom changes in the blood volume of the patient during dialysis. The technique enables a clinician to monitor a desired biologic constituent concentration value, such as the hematocrit, oxygen saturation, or oxygen content values by deriving and displaying the same as digital values in real time.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.