Philips Respironics V60, User Manual

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4-1
Chapter 4. Principles of operation
System operational
overview
The Respironics V60/V60 Plus Ventilator is a microprocessor-controlled
pneumatic system that delivers a mixture of air and oxygen. It is powered by
AC with battery backup to protect against power failure or unstable power and
to facilitate intrahospital transport. The ventilator’s pneumatics deliver gas and
its electrical systems control pneumatics, monitor the patient, and distribute
power.
The user provides inputs to the ventilator through a touchscreen, a key panel, a
navigation ring (legacy versions), and an Accept button. These inputs become
instructions for the pneumatics to deliver a precisely controlled gas mixture to
the patient. Pressure and flow sensors provide feedback, which is used to
adjust gas delivery to the patient. Monitored data based on sensor inputs is
also displayed by the graphical user interface.
The ventilator’s gas delivery and monitoring functions are cross-checked. This
cross-checking helps prevent simultaneous failure of these two main functions
and minimizes the possible hazards of system failure.
A comprehensive system of visual and audible alarms helps ensure the
patient’s safety. Clinical alarms can indicate an abnormal physiological
condition. Technical alarms, triggered by the ventilator’s self-tests, can
indicate a hardware or software failure. In the case of some technical alarms,
limited ventilation is provided to give the user time for corrective actions.
When a condition is critical enough to possibly compromise safe ventilation,
the ventilator is placed into the ventilator inoperative state, in which oxygen
flow and blower operation are disabled.
The ventilator has several means to ensure that safe patient or respiratory
pressures are maintained. The maximum working pressure is ensured by the
high inspiratory pressure (HIP) alarm limit. If the set high pressure limit is
reached, the ventilator cycles into exhalation.