Patent · US Expired

Method for the spectroscopic determination of the oxygen saturation of blood in the presence of optical disturbance variables

US7333842B2 · kind B2 · utility

3Cited by

10References

3Claims

0Family size

Assignee

Carl Ziess Mesitec AG · DE

Inventors

Dietrich Schweitzer · Neustadt an der Orla, DE
Martin Hammer · Arendonk, BE
Eike Thamm · Jena, DE

Key dates

Filing date	Apr 17, 2003
Grant date	Feb 19, 2008
Priority date	—
Expiry date	Feb 29, 2024

Classification

Technology area (CPC A)Human Necessities
CPC primaryA61B5/14555
WIPO fieldMedical technology
WIPO sectorInstruments

Abstract

The invention is directed to a method for the spectrometric determination of the oxygen saturation of blood in the presence of optical disturbance variables in which transmission measurements and reflection measurements are carried out in at least two wavelengths that are isosbestic for hemoglobin and oxyhemoglobin, and at least one other wavelength at which the extinction of hemoglobin and oxyhemoglobin differ. Corresponding auxiliary functions are defined in the measurement spectrum (M) and in the reference spectra of hemoglobin and oxyhemoglobin, at least two of the measurement values or two of the reference values for the isosbestic wavelengths lying on this auxiliary function. A corrected measurement spectrum (M″) is generated by the two auxiliary functions. The oxygen saturation is determined by comparing the changed data of this corrected measurement spectrum (M″) with the data of the reference spectra at the other wavelength.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.