Hewlett-packard Company

Bernhard Wider

Michael Blank

Joachim Vester

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).

Growing community of inventors

Munich, Georgia

Bernhard Wider