BISTOURIES
Bistouries have a blunt end, followed by cutting edge.
These are long-bladed knives with a blunt end, and a curve on cutting edge.
HERNIA BISTOURY
Hernia bistoury is used to cut the constricting band that causes the strangulation in a hernia.
Bistouries are generally used to open hollow cavities or constricting band in a case of strangulated hernia.
TECHNIQUE
The blunt tip allows safe entry between the constricting band and the compressed intestine.
The instrument is then rotated, which brings be cutting edge against the strangulating band.
The strangulation can be released by cutting the band with the sharp edge away from the intestine (so as to avoid damage to the intestine).
FISTULA BISTOURY
Fistula bistoury can be introduced into the depth of the fistula.
It is rotated till the sharp edge is towards the skin.
The sharp edge lays vistopen the entire tract of fistula by cutting from inside.
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