'Easy' inhaler hope for
asthmatics
(BBC,UK edition)
Scientists have
devised a type of inhaler which they say is easier for asthmatics to use
correctly. Conventional inhalers need the user to "press and breathe" at
exactly the same time in order to receive the full dose.
In the K-Haler, designed by researchers from Hampshire, the release of the
drug is triggered by the user breathing in.
Its makers hope the device, which won the Medical Futures award for best
innovation to improve patient care, will become the standard device used by
asthmatics.
About five million people in Britain suffer from asthma.
Across the world, 500m people use the traditional "press and breathe"
pressurised metered dose inhalers.
For the device to work effectively, the user has to press down the canister
on the inhaler at exactly the same time as they breathe in.
Research has shown that about 70% find it difficult to co-ordinate the
movements, so they are not effectively treating their condition.
This can mean patients are prescribed dose increases and extra medication
which they would not need if they were able to feel the full benefits from
their inhaler.
Alternatives have
been developed but they have been expensive and clumsy to use.
Crucial kink
The K-Haler, devised by pharmacist John Bell and clinical scientist Dr Ray
Bacon, is triggered by the user's breath. This means the drug is delivered
as the user inhales.
The scientists estimate the breath-actuated inhaler could be manufactured at
around a tenth of the cost of current devices. It is also environmentally
friendly because it is made entirely from recyclable plastic.
They say it may be available in as little as 18 months.
The key difference in the K-Haler is a kink built into the device, based on
the same principle as the kink in a drinking straw.
The drug, held in the first kink of the K-valve, is only released when the
K-valve in straightened, in the same way that a drink can only be sucked up
a straw once the kink is straightened.
Because the drug is inhaled in the first part of the inhaled air, it
penetrates deep into the airways to treat the patients' asthma.
A study published last year showed the use breath-actuated inhalers halved
the prescribing of extra antibiotics and steroids to asthmatics, when
compared with the use of traditional "press and breathe" inhalers,
Replacement hope
Mr Bell told BBC News Online: "At the moment, patients may be prescribed a
standard inhaler and be on it for a month or two before the doctor decides
there has been no improvement and decides to up the dose."
He said the more reliable delivery method of the K-Haler would mean such
unnecessary dose increases should not happen.
Dr Bacon said: "Clinicians have intuitively accepted the co-ordination
problem with pressurised inhalers but it is only very recently that research
has begun to provide clinical data.
A spokeswoman for the National Asthma Campaign told BBC News Online:
"K-Haler represents another alternative for people with asthma.
"We know that some inhaler devices are difficult to use, for example,
because of the co-ordination required between releasing the medication and
breathing in, to get the correct dose.
"Whatever device is prescribed, it is important that people with asthma are
happy with their chosen device and are shown how to use it properly by their
GP or nurse."
Dr Andrew Vallance-Owen, group medical director of Bupa, which sponsored the
award, said the inhaler stood out as a simple but innovative idea.
"We were really struck by its ability to make a significant contribution to
the management of the millions affected by asthma nationwide."