Nested closure plug and set screw with break-off heads
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United States of America Patent
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-
May 4, 2004
Grant Date -
Feb 26, 2004
app pub date -
Aug 26, 2002
filing date -
Aug 26, 2002
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A nested closure plug and set screw arrangement with break-off heads for securing a spinal fixation rod within to a bone screw includes a closure plug advanceable into an open channel of a bone screw and having a central threaded bore to receive a threaded set screw. The set screw is provided with a centrally positioned set point and a V-ring for cutting engagement with the surface of a clamped rod. The closure plug may be provided with a V-ring for the same purpose. The set screw V-ring is positioned and adapted to deform into engagement with the closure plug by engagement with the rod surface. By this means, the set screw and closure plug may be removed simultaneously. The closure plug and set screw have break-off installations which separate from their fasteners when pre-selected installation torques are exceeded.
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