Hewlett-packard Company

Michael Blank

Joachim Vester

Bernhard Wider

Michael Kaluza

Described is a method and a system for detecting the arterial oxygen saturation of hemoglobin (also called blood oxygenation, SpO2 or SaO2 measuring), comprising a measuring device for performing a blood oxygenation measurement and a controller unit. The measuring device is controllable by the controller unit so that the blood oxygenation measurement can be performed non-continuously. In a first step the measuring device is powered on, in a second step the blood oxygenation measurement is performed, and in a third step the measuring device or parts thereof are powered down, whereby the three steps are repeatable periodically. This provides SpO2 measurement applicable in telemetric or handhold instruments. The system is preferably used in telemetric or handhold instruments.

Intermittent measuring of arterial oxygen saturation of hemoglobin

A system for invasive measuring of blood gas parameters, such as pH, pO.sub.2 or pCO.sub.2 , or for measuring other parameters influencing the time constant of the excited state of a fluorescent dye, comprises a light generation device including a generator (2), a delay device (4) and a light source (6), a fluorescent measuring probe (1), a light reception device (16), a light guide device, which is adapted to be switched over and which, in its first switching state, optically connects the light source (6) to the fluorescent measuring probe (1) and said probe (1) to the light reception device (16) and which, in its second switching state, establishes an optical connection between the light source (6) and the light reception device (16), a phase metering device (17to 20, 23 to 27) as well as an evaluation device (28), which, in the second switching state of the light guide device (7), determines the transfer characteristic of the blood gas parameter measuring system and which, in the first switching state of the light guide device (7), determines the measuring value of the blood gas parameter on the basis of the transfer characteristic, the output signal of the phase metering device (17 to 20, 23 to27) and a correlation between the respective values of the blood gas parameter and the associated values of the time constant of the fluorescent measuring probe (1), said correlation being predetermined for the fluorescent measuring probe (1).

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Boeblingen, Germany

Michael Blank