What is a vaginal pessary? A vaginal pessary is a removable plastic device placed into the vagina to help to support areas of pelvic organ prolapse. The pessary is most often used to reduce prolapse of the uterus (womb). A pessary is a soft, flexible device that is placed in the vagina to help support the bladder, vagina, uterus, and/or rectum. Pessaries are made in many different shapes and sizes. A pessary is a non-surgical way to treat pelvic organ prolapse and sometimes incontinence. Pessary Insertion. How is the pessary inserted? It is inserted through your vagina. Your doctor can insert the pessary at your visit to the outpatient department.