Pneumatically-powered hand tool used for cutting bolts during bone-fixing in surgery - uses compressed gas cartridge to supply motive power and includes regulator

摘要

The tool has at least one pneumatic motor (1a, 1b), transmission (2) and regulator. The motor(s) can be of the piston and cylinder type producing reciprocating motion or of the rotary type. The tool is powered by a commercially-available gas cylinder containing 16g of CO2 at a pressure of 56 bar. Illustrated is a surgical implement to crop bone-fixing bolts. The bolt end is inserted in the hole (7) to enter the eccentric bore (9) of the inner rod (8). The rod rotates within the fixed outer cylinder (5) to cut and retain the cut end.