Hi Mo18, and thanks for your question.
I believe the device you are referring to (an Air Physio), is an adjunct device that may be used to help patients clear their airways of mucus.
If we are both speaking of the same thing now, it falls into the category of positive expiratory pressure (PEP) devices. From my experience, many patients do well using the device, but it may not be helpful for everyone.
I would also suggest you discuss this type of therapy with your physician to determine if this is suitable for your particular condition.
All the best,
Leon (site moderator COPD.net)