ACUTRONIC fabian HFO - Page 110

110 Accessories and options
fabian HFO | SW 5.1.x
Ref: 113003.EN / Date 2020-02-10
The Microstream EtCO
2
sampling lines deliver a sample of the inhaled and exhaled gases from the
ventilator circuit or directly from the patient (through an oral/nasal cannula) into the monitor for CO
2
measurement. Moisture and patient secretions are extracted from the sample, while maintaining the
shape of the CO
2
waveform.
The 50 mL / min. sampling flow rate reduces liquid and secretion accumulation, decreasing the risk
of obstruction in the sample pathway in humid ICU environments. This low sampling rate is ideally
suited to measure a neonate’s low tidal volume.
Once inside the Microstream CO
2
sensor, the gas sample goes through a micro-sample cell (15
microliters). This extremely small volume is quickly flushed, allowing for fast rise time and accurate
CO
2
readings, even at high respiration rates.
The Micro Beam IR source illuminates the micro-sample cell and the reference cell. This proprietary
IR light source generates only the specific wavelengths characteristic of the CO
2
absorption
spectrum. Therefore, no compensations are required when different concentrations of N
2
O, O
2
,
anesthetic agents and water vapor are present in the inhaled and exhaled breath. The IR that passes
through the micro-sample cell and the IR that passes through the reference cell are measured by the
IR detectors.
The microprocessor in the board calculates the CO
2
concentration by comparing the signals from
both detectors.
12.2.3.1 MicroPod messages
The MicroPod supports following messages and alarms
• "check calibration"
• "check flow"
• "CO
2
value over-range"
• "initialization"
• "invalid CO
2
value"
• "pump off"
• "purging in progress"
• “Sensor off"
• "Sensor state: ok"
• "SFM in progress"
• "standby"
• "Temperature out of range"
The messages are displayed on the information line of the CO
2
Monitoring screen or in the CO
2
Settings menu.