Intramedullary pin cutting instrument

Cutlery – Cutting tools – Plural cooperating blades

Patent

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Details

30 92, 30182, 128318, B26D 109

Patent

active

044439415

ABSTRACT:
An instrument for cutting elongated pins used in orthopedic surgery includes a housing having a reduced diameter portion in which is disposed a piston reciprocable in a fluid chamber. An enlarged diameter portion of the housing forms a further part of the fluid chamber in which is disposed a second piston connected to a member forming a first cutting edge which is movable toward an anvil having a second cutting edge cooperable with the first cutting edge to shear a pin to a predetermined length. The smaller piston is engaged by a screw actuator disposed on the housing and which may be rotated to provide a substantial force multiplication whereby a sufficient cutting force is exerted on a pin. The instrument is provided with a transverse handle portion to facilitate handling and to hold the instrument against reaction forces of the screw actuator. The cutting edges are formed on cooperable anvil and actuating member portions. A reduced diameter nose portion of the instrument includes a transverse bore for supporting a pin to be cut.

REFERENCES:
patent: 1491022 (1924-04-01), Arbon
patent: 2558641 (1951-06-01), Beezley
patent: 2755550 (1956-07-01), Benjamine
patent: 2863214 (1958-12-01), Szappanyos
patent: 3093024 (1963-06-01), Pell
patent: 3906628 (1975-09-01), Hastings

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