- Two different solutions for the use of mechanical filters are recommended:
o Solution 1 – Passive humidification
Use of a combined element: Heat and Moisture Exchanger (HME) / mechanical
breathing system filter (e.g. Dräger TwinStar HEPA)
Location: only at the patient connector (Y-piece)
o Solution 2 – Active humidification
In combination with active humidification, use two mechanical filters without
HME (e.g. Dräger SafeStar filter series).
Location: at the inspiratory AND the expiratory ports of the anesthesia device
Please consider the following information regarding active humidification in
combination with anesthesia devices.
If possible from a clinical perspective, use HME / mechanical breathing system filters at the Y-
piece (solution 1) with Dräger anesthesia devices.
- The use of active humidification is not approved with Dräger anesthesia devices If, however,
an active humidifier is used in this exceptional situation, rebreathed humid gas must not create
excessive condensation in the breathing system of the anesthesia device. Breathing circuits
require a water trap in the expiratory limb. Dual heated breathing circuits must not be
used with Dräger anesthesia devices. Also, the use of filters or even HME/filters at the Y-piece
must be avoided to prevent excessive breathing resistance due to clogged filters resp.
HME/filters during active humidification. When using a filter at the expiratory port, the resistance
can potentially exceed values demanded by the ISO 80601-2-13:2011 standard. Close
monitoring of the respective ventilation, e.g. particularly narrow limits for the minute volume low
alarm and vital parameters, are compulsory. Additionally, a filter must be used on the inspiratory
port of the anesthesia device. As mentioned before, only mechanical filters shall be used. A
high fresh gas flow of at least 150% of the minute volume helps avoid excessive
condensation in the breathing system as well as at the filter at the inspiratory port. For
the reprocessing of the anesthesia device after each patient follow the recommendations for
anesthesia devices potentially contaminated with SARS CoV-2.
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