This 19th century amniotomy instrument is made with a crosshatched ebony and carved ivory handle.

The body has a similar appearance to a normal uterine sound. However, pressure on the thumb piece pushes a spring loaded sharp steel point 2 cm from the distal end. This instrument would have been used to puncture the amniotic sac and induce labour.

Ext link: The Obstetrician’s Armamentarium, Hibbard

• From the Phisick collection