Segmental instrumentation of the posterior spine

Details Segmental instrumentation of the posterior spine Segmental instrumentation of the posterior spine

1990-08-09

1991-07-23

Hafer, Robert A.

Surgery

Instruments

Orthopedic instrumentation

606 72, 606 73, 128 69, 623 17, A61F 504, A61F 500, A61F 244

Patent

active

050340115

ABSTRACT:
Improved instrumentation of the posterior spine includes a threaded screw for insertion into the sacrum, threaded adjusting rods and intravertebral hook device on the end of the adjusting rod. One end of the adjusting rod includes a pivotal clevis assembly and an automatic safety interlock for securing the clevis assembly to the screw. The receiving end of the bone screw includes spaced arms to receive the clevis which is inserted and rotated to a locking position. Thereafter, the hooks are positioned on the lamina and the adjusting rod is adjusted for compression or distraction. The hex area on the adjusting rods are then safety wired. The generally triangular orientation provides added strength and a wider foot print attachment which will resist rotational forces. Also disclosed is an improved bone screw which facilitates placement of a bone cement in the desired location.

REFERENCES:
patent: 4361141 (1982-11-01), Tanner
patent: 4382438 (1983-05-01), Jacobs
patent: 4411259 (1983-10-01), Drummonds
patent: 4422451 (1983-12-01), Kalamchi
patent: 4433677 (1984-02-01), Ulrich
patent: 4569338 (1986-02-01), Edwards
patent: 4653481 (1987-03-01), Howland
patent: 4655199 (1987-04-01), Steffee
patent: 4771767 (1988-09-01), Steffee
patent: 4854304 (1989-08-01), Zielke

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