Method and apparatus for determining oxygen saturation in vivo
US4651741A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 30, 1985 |
| Grant date | Mar 24, 1987 |
| Priority date | — |
| Expiry date | May 30, 2005 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B5/1459
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
Accurate in vivo measurement of blood oxygen saturation by fiberoptical means is made possible throughout a wide range of hematocrit or total hemoglobin values by using a single R/IR ratio I and calculating the SO.sub.2 value therefrom through the use of a second-order polynomial of the form EQU SO.sub.2 =Ak.sup.2 I.sup.2 +BkI+C in which A, B and C are hematocrit or total hemoglobin-dependent coefficients. These values may be contained in a lookup table accessed by a hematocrit or total hemoglobin value selection, and k is a purely multiplicative calibration constant which can be readily determined for any individual fiberoptic system.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.