D.S.Schetkin. Tool for drilling the fetal head. (Medic. Review. 1893. No. 3)

Recognizing the Blot spear-shaped perforator as a rather useful tool, the author, however, on the basis of personal experience and theoretical reasoning, finds an excessive ability to open it; to destroy the contents of the skull is much more convenient with a long forceps, and to increase the opening into the skull by pushing apart into your needs, since the opening and without the mentioned act is large enough, both for removing the brain and for introducing the inner spoon of the cranioclast.