Ultra clean ventilation systems for operating theatres

Published: 13-Oct-2003


Air filtration specialists McLeod Russel (UK) has launched its new Luwa CG System onto the UK market which, it says, provides a cost-effective means of reducing the risk of infection and possible deaths caused by contaminated air. The CG system provides an optimum solution of using a turbulence-free airflow within a restricted area, trapping micro-organisms within HEPA filters. Air in hospital rooms becomes contaminated with germs from three sources: 1. the introduction of outside air 2. reproduction in the components of the air handling systems 3. dissemination by people.

The most effective means of controlling contamination, both in terms of performance and cost, is using a turbulence-free airflow within a restrictive area. This is known as 'selective protection' and is applied over the wound area, as well as over the instrument table. The Luwa CG System is based on tempering and cleaning outdoor air. After the air has passed through highly effective HEPA filters, an air pressure is built up in a pressure box placed in the ceiling above the operating table in the operation room. The bottom of the pressure box is made of a unique bi-layer micro-fibre diffuser technology, which produces a highly efficient stable laminar flow. The air is pressed at low speed through these layers. The result is an intact laminar vertical airflow pressed unaffected past OP lamps and the operation table from the ceiling of the operating room all the way to the floor. In traditional systems perforated metal is used instead of synthetic layers which results in an element of turbulence since the air rays leaving the perforated sheet must have a relatively high speed, 0.4-0.5m/s. This turbulence could attract contamination from the surrounding area, infecting the patient's wound area. The Luwa CG system uses an outer zone with a slower airflow, around 0.2m/s, to screen off the dirty surrounding air and quiet down the clean air in the outer area, producing a much higher level of cleanliness.

T: +44(0)1282 413131 dcm@mcleodrusseluk.com

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