Respiratory gas measurement - smart and cost-effective

New system provides exact measurement even at extremely low volume flow rates.

The new respiratory gas measurement enables the recording of the respiratory parameters volume and CO2 partial pressure in real-time.

Tube with integrated sensors.

Up to now, the measurement of respiratory gases was done using hot-wire anemometry, ultrasonic measurement and infra-red measurement processes. However, the disadvantages of these methods are their high costs and significant dead space volumes.The Karl Küfner GmbH & Co. KG, market leader in screen and filter technology, has come up with a way to combat these technical and economic disadvantages using thermal MEMS sensors: Thanks to their compact size, they can be integrated into small systems, e.g. a respiration tube, and facilitate an analysis directly at the mouth of the patient receiving artificial respiration. Working together with the Hahn-Schickard Society for system technology, Küfner has developed a combined sensor for the recording of the following parameters:

•    Respiratory volume
•    Respiratory temperature
•    Respiratory pressure
•    CO2 concentration


The system consists of a tube with integrated respiratory sensors and an electronic evaluation unit.The tube and sensors of the newly developed sensor systems come into contact with respiratory air and are disposable items. The accompanying electronic evaluation unit is reusable. When measuring respiratory gas with thermal sensors, the high humidity of respiratory air and the associated fluid condensation on the sensor pose a technical challenge. To meet this requirement, an MEMS sensor system was developed that provides an accurate measurement signal even when condensation from humid respiratory air accumulates in the tube.

Advantages of the Küfner measurement system
•    Exact measurement even at extremely low volume flow rates
•    Measurement in real-time
•    CO2 partial pressure, flow, volume, respiratory gas temperature and airway pressure
•    Individual parameters may be combined in modules
•    Low dead space volume
•    Can be integrated into the emergency and OP system 4.0

To learn more about the capabilities of the new respiratory gas measurement for your devices please contact us.

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