Why is the rate control not calibrated?
The tidal volume and rate controls actually adjust the mandatory breath inspiratory and expiratory time. The respiratory rate is not calibrated due to the interdependence of expiratory and inspiratory time on the total respiratory rate. For ease of use, these controls are labeled as tidal volume and rate since pNeuton uses a fixed mandatory breath flow rate. Once the tidal volume is set (inspiratory time), the rate can be set to the desired level. With the respiratory rate control set, the patient’s mandatory breath rate will not change unless the tidal volume control is changed. Only significant tidal volume changes (greater than 200 ml) will effect the rate. Adjusted to the desired parameters, the ventilator will provide the set tidal volume and rate regardless of changes in patient condition. See the pNeuton Operator’s Manual, Section 6: Theory of Operation for a more detailed explanation showing the math involved.
