Acapella Flutter Valve
The Flutter Valve is one of the first portable devices invented for lung exercise in for use by cystic fibrosis (CF) and chronic obstructive pulmonary disease (COPD) patients. Its main purpose is to aid mucous clearance by providing positive pressure and a vibration within the lungs.The most notable downside with the Flutter is its overall comfort. The entire thing is made from sturdy, unyielding plastic and is difficult to hold easily in the mouth. It is not a "hands-free" device, which is cumbersome for "on-the-go" types. Another disappointing aspect is that there is no way to increase or decrease the positive pressure exerted on the lungs.