Distractor mechanism for external fixation device
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United States of America Patent
Stats
-
Oct 28, 1997
Grant Date -
N/A
app pub date -
Oct 10, 1995
filing date -
Jun 10, 1993
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A distraction apparatus for an external fixation device used to rigidly immobilize bone fragments during bone lengthening and angular deformity correction includes distractor mechanisms and pivotable spacers for connecting frame members of an external fixator, and wire and half pin fasteners. The interconnected distractor mechanisms, pivotable spacers and frame members form a rigid structure with rigidity which is maintained during adjustment of the distraction. For linear distraction, the distraction mechanism is a single screw assembly with a single-threaded rod and dual plastic nuts, or one of three various types of telescoping screw assemblies having a single-threaded rod, a coaxial sleeve for receiving the rod and one of three types of plastic connector assemblies. For angular distraction, the distraction mechanism includes an angular distractor with a rotatable knob and pivotable spacers which are connected to the frame members. For wire and half pin fixation to the frame members, the fastener assembly includes a metal fixation bolt with a transverse teardrop-shaped hole for providing consistent three-point contact surfaces to secure the wires and half pins regardless of their diameters.
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