A large late 19th century destructive instrument used to perforate the skull in cases of arrested labour. This was done before the advent of the caesarian section to allow extraction the foetus, without which the mother would die. After placing the heavy arched blade behind the head the central rod was introduced and the ebony handle turned with forward pressure screwing the olive into the skull from below. The instrument is made from plated steel and is signed Joris (a Belgian instrument maker)