SLE SLE2000 HFO, Service Manual, Page: 5 / 84

SLE2000 HFO Service Manual
Doc No. SM/0001: Issue 7.0
Page 5 of 84
1. I
NTRODUCTION
T
HE
SLE2000 HFO P
RINCIPLES OF
O
PERATION
The SLE2000 HFO is based on the patented valveless ventilator design and can be operated in normal
modes of ventilation.
When used as a High frequency oscillatory
ventilator an additional flow of driving gas is
introduced into the exhalation block. This flow
is supplied through a rotating shaft mounted on
a variable speed motor. This flow of driving gas
is adjusted by the oscillatory pressure regulator
mounted in the pneumatic module ensuring a
constant oscillatory pressure waveform at all
operating frequencies. This rotating driving
pressure produces oscillatory action in the
patient circuit with an active expiratory flow of
gas. The oscillatory flow of gas is supplied from
a separate rotating jet, therefore it is possible to
add the oscillations to the inspiration or
expiration pressures. It is also possible to add
oscillations to the inspiratory plateau when
operating the ventilator in any of the Patient
triggered modes of operation.
As in the SLE2000 every care has been taken in the design to ensure the safe operation of the ventilator.
When in use the rotation of the motor is constantly being monitored, should any malfunction be detected in
the HFO operation the flow of oscillatory driving gas will immediately be stopped, and the ventilator will
display motor failure alarm. All other functions of the ventilator such as micro-processors, fans, internal
solenoids and front panel controls are constantly being checked for correct operation.