LTV 1100 Operator Manual - CareFusion

Appendix D - PRINCIPLES OF OPERATION
Overview
The LTV ® 1100 ventilator utilizes an electromechanical pneumatic system under the control of a
microprocessor to deliver patient ventilation. The following diagram and description illustrates the
major components of the ventilator and their respective functions.
Room air enters the ventilator through a flexible foam Inlet Filter. After exiting the filter, the air enters
an Accumulator/Silencer where it mixes with oxygen from the Oxygen Inlet. In addition, this
chamber provides acoustic silencing to reduce the Rotary Compressor input noise. Mixed gas then
enters the Rotary Compressor, where energy is added to the gas stream as required to meet the
pressure and flow delivery requirements of the current ventilation settings.
Gas exiting the Rotary Compressor output port enters another Silencer. This chamber dampens
acoustic noise from the Rotary Compressor. Upon exiting the silencing chamber, the gas flow splits
in two paths. Gas flow for ventilation diverts to the Flow Valve, while excess flow is recirculated
through the Bypass Valve to the inlet Accumulator/Silencer. The Bypass Valve maintains Flow
Valve inlet pressure high enough above Flow Valve outlet pressure to ensure a positive differential
pressure across the valve, yet low enough to ensure that excess energy is not wasted when
operating from batteries.
21106-001, Rev. E Operator’s Manual - LTV ® 1100 Ventilator D-1