（Surgical.) A bistoury or scalpel for making the incision in lithotomy.
This knife is of various sizes and shapes, blunt, probe, or sharp pointed.
It is inserted through the groove of the lithotomy-staff, through a small opening previously made in the urethra, and carried along into the bladder, making an opening just large enough to allow the extraction of the stone by means of the forceps.
The gorget, bisector, and bistouri cache are varieties of ithotomes. Hippocrates, d. 357 B. C., treats of the operation of lithotomy, which seems in his time to have been practiced as a specialty by certain chirurgeons.
Five methods of operating are enumerated by Dunglison, in some cases requiring special instruments.
As it is the neck or body of the bladder that is cut, the instrument might more properly be called a cystotome.
Li-thot′o-me — cache.
（Surgical.) An instrument used in lithotomy.
It is introduced with blades concealed in a sheath, from which they are protru
The trephine is sometimes worked by a revolving brace like that of the carpenter, and has even been socketed upon a stem with three legs, and turned by one hand while the socket is held by the other.
The trephine for the antrum (d) is a small crown-saw set in the end of a handle.
It is used for entering the antrum through a tooth-socket.
Trepanning instruments were used by the ancients; Hippocrates (d. 357 B. C.) gives directions for their use, and refers to the operation as widely known.
It was in great repute among the Greeks and during the Middle Ages.
Fabricius ab aquapendente is referred to as an improver of the instrument.
Trestle for scaffolding.
The Kabyles of Africa practice the operation by making four kerfs in the shape of a square; the eight overlapping extremities of these kerfs show unmistakably the nature of the operation among the native African surgeons; the same marks ar