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US5171279: Method for subcutaneous suprafascial pedicular internal fixation

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Filing Information

Inventor(s) Hallett H. Mathews ·
Assignee(s) Danek Medical ·
Attorney/Agent(s) Woodard, Emhardt, Naughton Moriarty & McNett ·
Primary Examiner Randy C. Shay ·
Application Number US7852577
Filing date 03/17/1992
Issue date 12/15/1992
Predicted expiration date 03/17/2012
U.S. Classifications 623/17  · 606/61  ·
International Classifications A61F 244  ·
Kind CodeA
International Classifications 128898 ·
8 Claims, No Drawings


Abstract

A method for internal fixation of vertebra of the spine to facilitate graft fusion includes steps for excising the nucleus of an affected disc, preparing a bone graft, instrumenting the vertebrae for fixation, and introducing the bone graft into the resected nuclear space. Disc resection is conducted through two portals through the annulus, with one portal supporting resection instruments and the other supporting a viewing device. The fixation hardware is inserted through small incisions aligned with each pedicle to be instrumented. The hardware includes bone screws, fixation plates, engagement nuts, and linking members. In an important aspect of the method, the fixation plates, engagement nuts and linking members are supported suprafascially but subcutaneously so that the fascia and muscle tissue are not damaged. The bone screw is configured to support the fixation hardware above the fascia. In a further aspect of the invention, a three component dilator system is provided for use during the bone screw implantation steps of the method.

Independent Claims | See all claims (8)

  1. 1. A method for internal fixation of the spine comprising the steps of:a) inserting a guide pin into a pedicle of at least two vertebrae to be instrumented for internal fixation;b) making an incision in the skin at the entry site for each guide pin;c) dissecting subcutaneous suprafascial tissue between each entry site;d) initially advancing a bone screw over each guide pin through each incision and into each pedicle, the bone screw having bone engaging threads and machine threads for engaging a nut;e) elevating the skin between each entry site;f) inserting a fixation plate into the subcutaneous suprafascial space and supporting the plate on and between at least two bone screws with the machine threaded portion projecting above the plate; andg) clamping the fixation plate to the bone screws using nuts engaging the machine threaded portions of the bone screws with the fixation plate supported above the fascia and muscle tissue but beneath the skin of the patient.

References Cited

U.S. Patent Documents

Document NumberAssigneesInventorsIssue/Pub Date
US3964480 FRONING EDWARD C Froning Jun 1976
US4545374 Jacobson Oct 1985
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Other Publications

Harrington Spine Instrumentation and Fusion Technique, Paul R. Harrington, Zimmer, Feb. 1973.

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