hegar dilator in a sentence

1. Hegar introduced the dilators in 1879 . Hegar dilators are widely used in gynecology to open up the cervix.
2. Among the many techniques and instruments he developed were Hegar's sign and Hegar dilators, as well as Hegar's operation, an operation for repairing a ruptured perineum.
3. It's difficult to find hegar dilator in a sentence.