Simpson uterine sound

Simp·son u·ter·ine sound

(simp'sŏn),
a slender flexible metal rod used to calibrate or dilate the cervical canal, or to hold the uterus in various positions during gynecologic surgery.

Simpson,

Sir James Y., Scottish obstetrician, 1811-1870.
Simpson forceps - obstetrical forceps.
Simpson uterine sound - a slender flexible metal rod.