Harvard Inspira Advanced Safety Ventilator User`s Manual

20

Operation: Getting Started

Warnings and Faults

Pump Stall

This fault indicates that the expected motion of the piston axis does not match the actual motion. This is a critical fault and requires operator intervention. The valve is set to the expiration position and the machine is commanded to STOP. The user is always notified via a visual alarm and also by an audible alarm (if enabled).

Valve Stall

This fault indicates that the expected motion of the valve axis does not match the actual motion. This is a critical fault and requires operator intervention. The machine is commanded to STOP. The user is notified via a visual alarm and audible alarm (if enabled).

Motor Drive Fault

This fault indicates a problem with the step motor drive. This is a critical fault and requires operator intervention. The machine is commanded to a STOP state.

Airway Over-Pressure

This fault indicates that an overpressure condition has been detected in the airway.

The user is always notified via a visual alarm and also by an audible alarm (if enabled).

An overpressure in Volume Control mode is defined as a pressure greater than the average measured peak pressure (averaged over 10 samples, not counting sigh breaths) plus 10 cmH2O, or 67cmH2O, whichever is smaller.This limit is adjusted during sigh breaths to 150% of the average value or 67 cmH2O, whichever is smaller.The optional user-entered inspiration pressure limit is used as a secondary pressure check. The default limit is 35 cmH2O. If the average pressure should rise up and exceed this value, the user is notified via a visual alarm and also by an audible alarm (if enabled).

Airway overpressure conditions cause the inspiration stroke to stop; the machine immediately cycles to expiration. After completing expiration, the machine will continue to run the current respiration profile, repeating the above steps if the overpressure condition continues. If the fault is cleared, the alarms (visual and audible) will selfclear. Otherwise, the alarms will continue, requesting operator intervention.

Publication 5404-001-REV-C

21

Operation: Getting Started

Occlusion Alarm (Inspira ASVp Only)

If the peak pressure limit is reached within the first 40% of the inspiration stroke, an occlusion alarm is reported. This indicates that a restriction may be present in the airway or that the airway resistance may be too high for the flow rate. Occlusions, system restrictions due small tubing and/or port diameters, or incorrect respiratory parameters could be the cause.This alarm is self-clearing on removal of the fault condition.

Assist Alarm

This fault indicates that a vacuum trigger, which is generated by an inhalation effort by the patient, has not been detected on 5 consecutive cycles.This would be a result of the patient failing to initiate breaths on its own or of improper respiration parameter settings, such as assist pressure threshold or respiration rate.

Airway Under-Pressure

This fault indicates that an under-pressure condition has been detected in the airway.

For Volume Control mode, an under-pressure condition is defined as a pressure less than 25% of the average measured peak pressure (averaged over 10 samples, not counting sigh breaths), checked at a time approximately halfway into the inspiration stroke.

This could indicate that the airway is not connected or is leaking.This is a critical fault and requires operator intervention. The machine shall continue to run at the current respiratory settings. This fault shall be self-clearing once the condition is corrected.

The user is always notified via a visual alarm and also by an audible alarm (if enabled).

Underpressure Alarm (Inspira ASVp)

If the average airway pressure is less than 3cmH20, an underpressure alarm is reported. Underpressure conditions are generally caused by severe system leaks.This alarm is self-clearing on removal of the fault condition.

Initialization Fault

This fault indicates that the machine failed to initialize properly due to one or more reasons.

High PEEP Alarm (Inspira ASVp Only)

If the actual end-expiratory pressure (EEP) exceeds the desired PEEP plus 5cmH2O or

11cmH2O, whichever is less, a High PEEP Alarm is reported. This alarm is self-clearing on removal of the fault condition.