A uterine sound is described having a probe with measuring indicia inscribed thereon and a horseshoe-shaped body slidable along said probe and cooperative therewith for measurement of uterine position and dimension. A raised rib is located along a substantial length of the probe to normally retain the...http://www.google.ca/patents/US4121572?utm_source=gb-gplus-sharePatent US4121572 - Uterine sound
