Final answer:
A Gehrung pessary is used for combined anterior and posterior vaginal prolapse, providing support to both vaginal walls and potentially aiding with apical prolapse.
Step-by-step explanation:
A Gehrung pessary is typically used for the treatment of combined anterior and posterior vaginal prolapse. This type of pessary is designed with a wire framework that can be adjusted to fit the individual anatomy of the woman using it. The Gehrung pessary assists in supporting both the front (anterior) and the back (posterior) walls of the vagina, thereby addressing both anterior and posterior prolapses. It also has a curved shape that supports the apex of the vagina. However, while it can help with some degree of apical prolapse, it is most suitable for cases where combined anterior and posterior prolapse is present.