Surgery – Diagnostic testing – Measuring or detecting nonradioactive constituent of body...
Patent
1996-10-10
1998-12-08
Bahr, Jennifer
Surgery
Diagnostic testing
Measuring or detecting nonradioactive constituent of body...
600336, A61B 500
Patent
active
058461906
ABSTRACT:
A pulse oximeter has several processing channels for measurement signals which are measured during the switched-on phase of transmission diodes and which are used to determine the oxygen saturation (SpO.sub.2) of a patient. An additional measurement channel processes an ambient light signal which was measured while the transmission diodes were switched off or their intensity modified, in the same way and thus provides a measure of the spectral composition of the ambient light interference. A useful-to-noise-signal ratio (NSV) is derived from the ambient light signal and a measurement signal, which represents a measure of the signal quality and which can be compared with threshold values (G), where an alarm is triggered if the value falls below the threshold values.
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patent: 5368224 (1994-11-01), Richardson et al.
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patent: 5503148 (1996-04-01), Pologe et al.
patent: 5570694 (1996-11-01), Rometsch
Von K. Forstner, Pulsoximetrie (Teil 2).sup.1), Medizintechnik 110. Jg Jun. 1990, pp. 213-217.
Bahr Jennifer
Hewlett--Packard Company
Winakur Eric F.
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