I am looking for something to help my Dad who has COPD with thick sputum that is very hard to clear and a constantly painful tight chest from struggling to breathe. He is 78 and very underweight and weak so needs something that will loosen/clear phlegm but without being too rigourous on his body. Any advice or experiences with these gadgets would be a great help. They are VERY expensive so can't afford to make a mistake!
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