Hoffmann-la Roche Inc.

Linde Medical Sensors Ag

Kontron Holding Ag

Radiometer Basel Ag

Kontron Instruments Ag

Patrick Eberhard

Jean-Pierre Palma

Wolfgang Mindt

Pierre-Alain Gisiger

Dominik Liechty

Sohei Kagawa

Hans Sch&ouml;llermann

Hans Schollermann

Robert Schafer

Robert Scharf

In a process for measuring partial transcutaneous COpressure on an earlobe by means of a sensor having a measuring device for measuring the partial transcutaneous COpressure and a heating system for heating a sensor contact surface for contact with the earlobe, the sensor contact surface is heated. During a first phase, the sensor contact surface is kept at an elevated temperature of at least 41.5&#xb0; C. in order to prevent the measured value of partial transcutaneous COpressure from exceeding, due to the measurement process itself, the partial transcutaneous COpressure achieved after stabilization. The temperature of the sensor contact surface is then reduced to between 37&#xb0; C. and 41&#xb0; C. This facilitates considerably faster evaluation of the measured values.

[object Object]

A device for the combined measurement of the arterial oxygen saturation and the transcutaneous CO partial pressure on an ear lobe comprises a sensor. The sensor has means for pulse oximetric measurement of the arterial oxygen saturation, means for measurement of the transcutaneous CO partial pressure and means for warming a sensor contact surface intended for contact with the ear lobe. The device makes simple and reliable measurement of the arterial oxygen saturation and the transcutaneous CO partial pressure possible on an ear lobe.

Device for the combined measurement of the arterial oxygen saturation and the transcutaneous CO2 partial pressure on an ear lobe

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 (,). The signals (S,, S,) generated at these photodiodes (,) are normalized to equal levels of their DC components. Finally, to detect spurious signals caused by movements, the differences (&Dgr;S,) of these normalized signals (S,, S,) are formed.

Detection of parasitic signals during pulsoxymetric measurement

Method of non-invasive determination of oxygen saturation in tissue in

A combined sensor for sensing partial O.sub.2 pressure and partial CO.sub.2 pressure and comprising measuring electrodes, a reference electrode, a diaphragm covering the electrodes and an electrolyte layer between the electrodes and the diaphragm wherein the reference electrode has disposed around it a screening of gold which is at the same potential as the reference electrode and the electrolyte contains a defined concentration of a soluble silver compound or of a silver complex.

Electrodes for the combined measurement of oxygen and carbon dioxide

Calibration of sensors of the type used for the cutaneous determination of blood oxygen and carbon dioxide levels is facilitated by providing separate sensor units, alternatively and removably connectable to a calibration device and to the measuring devices with which they are used for such determinations. The sensor units contain, in addition to a sensor electrode, a data memory in which is stored calibration data generated when the sensor unit is connected to the calibration device. The calibration device can provide a plurality of calibration stations, each capable of supplying a standard gas to a connected sensor and, in response to signals from the sensor exposed to the standard gas, generating data signals representing the calibration of the sensor, which signals are transmitted to the data memory of the sensor unit. Upon connection of the sensor unit to the measuring device, the calibration data from the data memory of the sensor unit are used as a calibration base for measurements by the sensor.

Method and apparatus for calibration of sensors

An apparatus for the simultaneous determination of the cutaneous blood gas concentration and of the blood gas availability for the correction of physiologically caused errors of the measured value of the cutaneous blood gas concentration by means of two heated blood gas electrodes in structural unity, of which one is distinguished by maximum gas consumption.

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Bottmingen, Switzerland

Patrick Eberhard