Erectaid uses negative pressure to distend the corporal sinusoids and to increase blood inflow to the penis. In this setting, an external constricting ring is placed at the base of the penis to prevent blood outflow from the corpora cavernosa, and an erection is maintained for sexual intercourse. As a non-invasive, effective, safe, drug-free and cost-effective erectile dysfunction (ED) treatment, VCD was gradually accepted by the urological community and was finally recommended as an alternative for treatment of ED by the American Urological Association in 1996.