Bone screw
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United States of America Patent
Stats
-
May 11, 1993
Grant Date -
N/A
app pub date -
Jun 28, 1991
filing date -
Nov 3, 1989
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A bone screw (1) has a threaded portion (2) and a head (3). Such screws are used in particular as pedicle screws. In order that the bone screw can be anchored securely also in soft bone tissue, the screw is provided with a longitudinal bore (5) extending along the longitudinal axis of the threaded portion (2), the longitudinal bore (5) being provided with a tapered portion (7) opposite to the head (3). In this region of the screw, slits are extending parallel to the threaded portion and an interior thread is provided. An expander part (12) having a tip (14) forming the point of the screw and a shaft (16) having a threaded portion (17) cooperating with said interior thread are provided.
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Family
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Cited Art Landscape
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