Zephyr® Endobronchial Valve, side view

Reproduced with permission from: Strange, C, Herth, FJ, Kovitz, KL, et al. Design of the Endobronchial Valve for Emphysema Palliation Trial (VENT): a non-surgical method of lung volume reduction. BMC Pulm Med 2007; 7:10. Copyright © 2010 BioMed Central Ltd.