References in periodicals archive ?
Absence deformities including constriction rings occur much less frequently, with an incidence of one in 2000 to 3000 live births (Goldberg and Bartoshesky, 1985).
A constriction ring is placed around the base of the penis to maintain the erection for up to 30 minutes.
Vacuum constriction devices feature a pump that draws blood into the shaft of the penis to create an erection and a constriction ring placed at the base of the penis to maintain the erection for up to 30 minutes.