In-Home Hand-Held Device to Measure Respiratory Resistance

A small hand-held Airflow Perturbation Device (APD) has been developed that is capable of noninvasively evaluating respiratory resistance. The APD has several advantages over commercially available spirometers. The APD is small, compact, self-contained, and low cost. It can measure respiratory resistance noninvasively in inhalation and exhalation accurately and reliably. Because of its size, cost, and ease of operation, it can be a suitable diagnostic device for home use