7. Emptying of machine
8. Complete shutdown for complex maintenance work
AIR CIRCULATION PRINCIPLE
- Compressed medical grade air
Filtered medical grade air provided by the hospital serves to blow the internal channels of the endoscope. It is
channelled to the endoscopes by means of a pressure regulator, a flow control and a timed solenoid valve on a
splitter incorporated into the mounting system located in the upper part of the storage unit. The endoscopes
are connected to the machine via a connector specifically designed for each type of endoscope.
- Circulated air
100% fresh air is circulated via a grid on the front using a ventilator motor located in the technical
compartment. It is blown into the storage unit where it is distributed from top to bottom. Properly calibrated
extraction allows overpressure to be optimised in the storage cabinet and enables heat and ambient humidity
to dissipate.
Excess air is vented through a grill located at the bottom rear of the storage compartment. The rotational
speed of the main fan motor is monitored when opening the storage compartment door in order to force air to
exit.
Principle of blowing and treating filtered air
Fresh air is distributed in the storage unit once it has been treated in a chain of filtration. It is filtered at a speed
of approximately 240m³/h (=120 volumes per hour) in order to optimise the elimination of ambient humidity.
- To obtain overpressure (>10 Pa) in the storage compartment, the extraction rate is maintained at a
lower level than the intake flow.
By default, the ventilator functions at 65% of nominal flow during operation and 100% in open-door
mode.
A pressure switch is present to detect and resolve a failure of the ventilator motor.
Aerobiodecontamination is achieved using a mechanical treatment chain procedure including:
- Pre-filtration with medium efficiency filter (EU3) 80% gravimetric
- Filtration with a high efficiency filter (EU5) 95% gravimetric
- Absolute filtration with an ultra-high efficiency HEPA filter (H 14) 99.99 to 99,999 DOP for particles of 0.3 µ
Mounting the endoscopes and principle of blowing air into channels
Endoscopes are suspended vertically in the air stream; optic in upper position on a rotating mounting plate
previously equipped with self-sealing couplers connected to a timed medical grade compressed-air diffusion
system.
The connection to the medical air uses a silicone tube (connector) equipped with a quick-connect plug with a
seal on the unit side and special, interchangeable sterilisable fittings provided by the endoscope manufacturer
(c.f. appendix B Medical air connector).
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