Case for trephination set, by Sirhenry, French, late 18th century to early 19th century

All the equipment needed for trephination – the process by which a hole is surgically made in the head – was contained in this case. This includes the trephines themselves, with their cylindrical blades, a large brace to hold the trephines during drilling, two rugines to remove connective tissue from bones, two lenticulars to depress brain material during surgery, and a brush to remove fine fragments of bone. Sirhenry was a surgical instrument maker based in Paris.