A vacuum constriction device is an external pump with a constriction ring to be placed at the base of the penis to get and maintain an erection. Intercourse can be attempted with the ring in place, which should not be held for longer than 30 minutes. As with injections and insertions, they are not appropriate for everyone. Side effects may include uneasiness and bruising of the penis.
Hatzimouratidis K, Eardely I, Giuliano F, et al. Guidelines on male sexual dysfunction: erectile dysfunction and premature
ejaculation. Update 2015. Available at website: http://uroweb.org/wp-content/uploads/14-Male-Sexual-Dysfunction_LR1.pdf