Pulse oximeter using a virtual trigger for heart rate...

A - Human Necessities – 61 – B

Patent

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A61B 5/00 (2006.01) A61B 5/14 (1995.01)

Patent

CA 2173596

The present invention provides an improved method and apparatus for more accurately calculating and measuring vital information such as oxygen saturation and pulse rate when an ECG signal is not available. Instead of using an ECG R-wave as a trigger to overlay optical pulses, a virtual trigger is generated based on the heart rate and used to overlay optical pulse data. The optical information from a number of periods is added together, with the beginning of each period being determined by the issuance of the virtual trigger. In this way, the maximum and minimum of the optical signal should be lined up with each other in each period and added together to give a cumulative maximum and minimum. This enables precise identification of the maximum and minimum of the signal, and thus allows calculation of the oxygen saturation at that point.

Procédé et appareil permettant de calculer et de mesurer avec une plus grande précision des informations vitales telles que la saturation en oxygène et la fréquence du pouls lorsqu'on ne dispose pas d'un signal d'électrocardiogramme (ECD). Au lieu d'utiliser, comme déclencheur, la partie R de l'onde d'un signal d'électrocardiogramme pour superposer les impulsions optiques, on génère un déclencheur virtuel à partir de la fréquence cardiaque et on l'utilise pour superposer les données d'impulsions optiques. On ajoute les informations optiques provenant de plusieurs périodes, le début de chaque période étant déterminé par le déclenchement du déclencheur virtuel. On peut ainsi mettre bout à bout le maximum et le minimum du signal optique dans chaque période et les additionner pour obtenir des valeurs maximum et minimum cumulatives. Ceci permet d'identifier avec précision la valeur maximum et la valeur minimum du signal et donc de calculer la saturation en oxygène au niveau de ce point.

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