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Use of device-end and HMEF filters on Hamilton Medical ventilators

Article

Author: Uwe Scherzer, Matthias Himmelstoss

Date of first publication: 04.08.2022

The coronavirus pandemic has brought greater awareness and concern about the potential for cross-contamination between infected patients and healthcare workers.
Use of device-end and HMEF filters on Hamilton Medical ventilators

Expiratory filter to control exhaled gas

This concern has prompted greater consideration of controlling the exhaled gas from the ventilator, which is best managed by using filters in the expiratory limb of the ventilator circuit. Correct placement is essential to ensure the efficacy of both the filter and the whole patient circuit.

To prevent any bacterial and viral contamination being released by the patient through the expiratory limb and exhaust port into the enivornment, a highly efficient hydrophobic filter (e.g., PN U50; PN 201022) should be placed in front of the expiratory valve. Humidity and nebulized drugs might affect the resistance of the expiratory filter, so be sure to monitor expiratory flows and exchange the filter at intervals of 24 hours or less as recommended in the respective instructions for use.

If using a proximal HMEF

If you use a proximal bacterial and viral HMEF (heat and moisture exchanger filter) together with unheated coaxial or dual limb breathing circuit sets, please position it between the flow sensor and the flextube as described in the respective ventilator’s Operator’s Manual. In this position, a highly efficient HMEF filters both the inhaled and exhaled gases, and there is no need for an additional filter at the inspiratory or expiratory port.

Note, that if you are using active humidification and therefore are not using an HMEF, please use a pleated hydrophobic bacterial and viral filter on both the inspiratory and expiratory ports of the ventilator.  

Positioning on Hamilton Medical ventilators

In the images below, you can see the correct positioning for filters on the various models of Hamilton Medical ventilator.

1. Inspiration: Highly efficient hydrophobic bacterial and viral filter
2. Expiration: Highly efficient hydrophobic bacterial and viral filter

Diagram showing positioning on inspiratory and expiratory ports
HAMILTON-C1/T1/MR1
Diagram showing positioning on inspiratory and expiratory ports
HAMILTON-C1/T1/MR1
Diagram showing positioning on inspiratory and expiratory ports
HAMILTON-C2/C3
Diagram showing positioning on inspiratory and expiratory ports
HAMILTON-C2/C3
Diagram showing positioning on inspiratory and expiratory ports
HAMILTON-G5/S1
Diagram showing positioning on inspiratory and expiratory ports
HAMILTON-G5/S1
Diagram showing positioning on inspiratory and expiratory ports
HAMILTON-C6
Diagram showing positioning on inspiratory and expiratory ports
HAMILTON-C6

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