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Injuries to the penis from zipper entrapment (đánh bẫy, lừa) are actually the most common cause of penile (tác động đến dương vật) trauma (chấn thương, tổn thương; sự việc đã qua gây đau buồn) in adults, with roughly 2,000 reported cases yearly. When they occur, the individual often presents to the emergency department with the prepuce (bao quy đầu; nếp gấp tương tự ở đầu âm vật) caught in the zipper after having unsuccessfully tried home management. It will often present with swelling, pain, bruising (thâm tím), and edema (chứng phù) related to the injury. Adult patients are often extremely reluctant (rất ngại ngần) to come to the hospital for this type of problem, due to extreme embarrassment (rất xấu hổ), which can cause delays in presentation and treatment. The majority of affected patients are children.[1][2] The condition of the penile skin or foreskin becoming caught in a zipper is technically described as a "zipper related penile injury" (ZIRPI) and was first reported in JAMA in 1936.

Zippers were first patented about 100 years ago by Gideon Sundback, a Swedish - Ameican engineer, as an improved clasp locker. At the time of its development, Sundback reportedly had some reservations about "possible genital mishaps". In 1923, B. F. Goodrich was the first company to use the new fastener commercially on their rubber galoshes. It was originally called a "separable fastener" but was soon given the catchy name of "zipper".

Penile rings are intended to improve and maintain erections and are typically used for erotic or auto-erotic purposes. Various types of constricting bands and the injuries they can produce have been reported, but the first case of penile strangulation from such a ring was described by Gauthier in 1755. When a ring becomes trapped either at the base of the penis or behind the penoscrotal junction, it can become quite serious. Such events, called penile ring entrapments, are quite rare. When distal venous engorgement and edema prevents their removal, the penis can progressively become quite swollen, ischemic, and painful. If left untreated, this can progress to ischemia, infarction, necrosis, and even gangrene. For these reasons, penile ring entrapments are considered urological emergencies and need to be dealt with promptly.[3]

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