Tapered thread root transition on cortical bone fastener
OwnerT. Hall Griffininventor
Life of this patent
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Abstract
An orthopedic fastener is disclosed, with a cylindrical shank having pre-selected diameter, the shank also providing adjacent unthreaded and threaded portions. The threaded portion is configured to secure the orthopedic fastener into cortical bone. The shank further has a thread root transition zone providing a tapered thread root profile between the unthreaded and threaded portions. The thread root transition zone is positioned on the shank such that, when the orthopedic fastener is operably secured into a specimen of cortical bone, the thread root transition zone is located outside of the specimen of cortical bone.
Claims20
A method for securing an orthopedic fastener into cortical bone, the method comprising:
- (a) providing an orthopedic fastener, the orthopedic fastener including:
- a cylindrical shank, the cylindrical shank having a pre-selected diameter, the shank also providing adjacent unthreaded and threaded portions, the threaded portion configured to secure the orthopedic fastener into cortical bone;
- the shank further having a thread root transition zone providing a tapered thread root profile between the unthreaded and threaded portions, the tapered thread root profile transitioning from zero to full thread cut over a predetermined number of thread turns;
- and
- (b) securing at least a portion of the threaded portion of the orthopedic fastener into a specimen of cortical bone such that, when the orthopedic fastener is operably secured into the specimen of cortical bone, the thread root transition zone is located outside the specimen of cortical bone.
A method for securing an orthopedic fastener into cortical bone, the method comprising:
- (a) providing an orthopedic fastener, the orthopedic fastener including:
- a cylindrical shank, the cylindrical shank having a pre-selected diameter, the shank also providing adjacent unthreaded and threaded portions, the threaded portion configured to secure the orthopedic fastener into cortical bone;
- the shank further having a thread root transition zone providing a tapered thread root profile between the unthreaded and threaded portions, the tapered thread root profile transitioning from zero to full thread cut over a predetermined number of thread turns in a range from about 2 to about 5;
- and
- (b) securing at least a portion of the threaded portion of the orthopedic fastener into a specimen of cortical bone such that, when the orthopedic fastener is operably secured into the specimen of cortical bone, the thread root transition zone is located outside the specimen of cortical bone.
A method for securing an orthopedic fastener into cortical bone, the method comprising:
- (a) providing an orthopedic fastener, the orthopedic fastener including:
- a cylindrical shank, the cylindrical shank having a pre-selected diameter, the shank also providing adjacent unthreaded and threaded portions, the threaded portion configured to secure the orthopedic fastener into cortical bone;
- the shank further having a thread root transition zone providing a tapered thread root profile between the unthreaded and threaded portions, the tapered thread root profile transitioning from zero to full thread cut over a predetermined number of thread turns in a range from about 2 to about 5;
- and
- (b) securing at least a portion of the threaded portion of the orthopedic fastener into a specimen of cortical bone such that, when the orthopedic fastener is operably secured into the specimen of cortical bone, the thread root transition zone is located outside the specimen of cortical bone and not at all in cancellous bone.
Dependencies are inferred from the claim text.