Importance

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Abstract

The invention provides a device capable of monitoring the concentration of anaesthetic gas in a breathing mixture being delivered to a patient to cause narcosis and consists essentially of an electronic transducer which provides an output signal proportional to the concentration of anaesthetic gas in a breathing mixture. The transducer includes a sensor having first and second electrical conductors positioned in proximity to one another and defining a space between the conductors. A substantially non-conductive material fills the space between the conductors and has a molecular structure which permits the absorption of the anaesthetic gas thereby causing variations in the electrical characteristics of the sensor. An electrical circuit is provided which is coupled to the sensor to provide the output signal which is proportional to the variations in the electrical characteristics of the sensor.

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First Claim