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The snare is made of metal, but the stylet or cannula is insulated on the inside, as is also the block that contains the electric post, as well as the head of the screw that holds the wire.
An interesting feature is the insulated wire used. The insulation is off on the distal or cutting side and is equivalent to a very fine cutting edge. The tissue that is to remain is thus protected by the insulation while the cutting electric current is facing that which is to be removed. The same principle may be applied to other cutting instruments that are used in electro-surgery.
It is to be used as a knife, the wire loop being moved toward the operator, or as a fixed loop, the whole instrument being moved either way.
536 Commonwealth Avenue.
Prenn J. ELECTROSURGICAL OR SURGICAL DIATHERMY SNARE. JAMA. 1928;90(24):1943. doi:10.1001/jama.1928.92690510001010a