An incentive spirometer is a handheld medical device used to help patients improve lung function by training them to take slow, deep breaths. As a patient inhales through a mouthpiece, a piston inside the device rises to give visual feedback on inspiratory effort, and the device is commonly used after surgery or certain illnesses to prevent pulmonary complications.
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Incentive spirometer (Wikipedia)
https://en.wikipedia.org/wiki/Incentive_spirometer, lead sectionQuote, https://en.wikipedia.org/wiki/Incentive_spirometer, lead section
An incentive spirometer is a handheld medical device used to help patients improve the functioning of their lungs.
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