Detection of parasitic signals during pulsoxymetric measurement

US6181959A · kind A · utility

Assignee

• Kontron Instruments AG · US

Inventors

• Hans Schollermann · Weil am Rhein, DE
• Patrick Eberhard · Allschwil, CH

Key dates

• Filing date: Mar 25, 1999
• Grant date: Jan 30, 2001
• Expiry date: Mar 25, 2019

Classification

• Technology area (CPC A): Human Necessities
• CPC primary: A61B5/14552
• WIPO field: Medical technology
• WIPO sector: Instruments

Abstract

In the proposed method for detecting spurious signals caused by movements of the patient or his environment in the pulse oximetric measurement of the arterial oxygen saturation, the intensity of the light emerging from the test specimen is measured by two photodiodes (7, 8). The signals (S.sub.1, S.sub.2) generated at these photodiodes (7, 8) are normalized to equal levels of their DC components. Finally, to detect spurious signals caused by movements, the differences (.DELTA.S.sub.n) of these normalized signals (S.sub.1n, S.sub.2n) are formed.