Nut starter wrench for orthopedic fixation system

Details Nut starter wrench for orthopedic fixation system Nut starter wrench for orthopedic fixation system

1992-11-23

1994-10-04

Brown, Michael A.

Surgery

Instruments

Orthopedic instrumentation

606104, A61F 232

Patent

active

053522311

ABSTRACT:
A tool assembly has a shaft with a sleeve slidable along it. A hexagonal drive post at the lower end of tile shaft is received in a hex socket at the upper end of a bone bolt secured in a patient's spine. A nut to secure a connector on the bolt, is temporarily stored on a short thread on the shaft near the lower end. The sleeve is slid down the shaft and a hex socket at tile lower end of tile sleeve is received on the nut. The sleeve is manually turned while a handle on a drive post at the top of the shaft prevents the shaft, and thereby the bolt, from turning. As the sleeve turns, the nut is turned off the short thread and down onto the bolt thread. A torque wrench coupled to a tool receiving surface at the top of the sleeve tightens the nut on the bolt to the specified torque while the handle on the top of the shaft prevents the bolt from turning.

REFERENCES:
patent: 1677473 (1928-07-01), Gast
patent: 2574352 (1951-11-01), Serter
patent: 2632351 (1953-03-01), Hannah
patent: 3334624 (1967-08-01), Schneider
patent: 3630107 (1971-12-01), Carr
patent: 3789705 (1974-02-01), Naslund
patent: 3889558 (1975-06-01), Duncan
patent: 3892232 (1975-07-01), Neufeld
patent: 4229999 (1980-10-01), Rottigni
patent: 4616638 (1986-10-01), Griggs
patent: 4716894 (1988-01-01), Lazzeri et al.
patent: 4744273 (1988-05-01), Burtok
patent: 4963144 (1990-10-01), Huene

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