Instructions for Use Supplement B – CO
2
Sensor LeoCap
|
Rev. 04
7
2.4
Theory of operation
The sensor allows the continuous measurement of the CO
2
concentration in the
patient's respiratory airflow by infrared spectroscopy.
The method is based on measuring the absorption of infrared light with a certain
wavelength by CO
2
molecules. The amount of measured light that passes through
the respiratory gas to the sensor serves as the calculation basis. The concen-
tration of CO
2
is calculated from the partial pressure at atmospheric pressure
condition.
By means of appropriate accessories, the sensor is connected to the breathing
circuit. The user can choose from different types of airway adapters for neonates,
children and adults.
The sensor is equipped with a monochromatic infrared emitter and a photo de-
tector. The adapter has two sapphire windows, transparent to the emitted in-
frared light. Through these windows, the light emitted from the infrared source
passes through the gas mixture to be analysed and reaches the photo detector.
Thus, the device measures the degree of absorption of infrared rays during their
passage through the gas stream.
3
General safety instructions
These instructions for use are an integral part of the delivery. When the device
changes ownership, the manual must also be handed over. Information contained
in this document can be changed without notice.
The device may only be operated by qualified medical staff (physicians, certified
nursing staff, nursing staff specializing in intensive care medicine, respiratory ther-
apists) in order to guarantee an adequate intervention in the event of a device
malfunction.
Before working with the sensor, carefully read these instructions for use as well as
the Basic Instructions for Use and Supplement A of the intensive care ventilator
used. Improper use of the sensor can cause malfunction, loss of performance and
it can create a hazard for the patient.
If malfunctions or unstable operation of the sensor occur, refer to the trouble-
shooting tips in section 4.7 and also to the appropriate sections of these instruc-
tions for use.
The following signs and symbols are used to identify important information in
these instructions for use:
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