"U-Saver".
Prolapses of the vagina typically occur during the latter part of gestation when estrogen concentrations are high. After replacement of a prolapsed vagina, this device is used to retain the prolapsed mass. The shoehorn like portion is inserted vertically into the vagina and is then turned 90 degrees. The strings are tied laterally to the wool. Ewes can subsequently lamb with the device in place, but should be observed frequently.

Drost M (1970)