London: A new device that can clean air while asthma patients go to sleep shows significant lowering of the disease symptoms, a study claims.

Those who tested the device reported a huge improvement in their quality of life - equivalent to that normally achieved only through expensive drugs - said researcher Jenny Hope, adding they were less likely to be admitted to hospital, a daily reported.

John Warner, a consultant paediatrician at St Mary's Hospital and professor of paediatrics at Imperial College London, led the study.

"This device makes a significant difference to people's lives, with an effect as big as very expensive treatments, and it helps prevent the triggers of the disease," Warner said.

The year-long trial involved 282 people with poorly controlled asthma. They aged from seven to 70 from six European countries, including 54 British children.

The protexo machine is placed next to the sufferer's bed, and has a large arm which delivers a flow of pure, filtered air around their head while they sleep.

The machine filters out the irritants and allergens that trigger inflammation in the lungs, including dust mites and pet hairs.

Asthma specialists are now calling for the air purification device, estimated to cost £4,000 (USD6,000), to be made available.

(Agencies)