Tapered thread root transition on cortical bone fastener
OwnerT. Hall Griffininventor
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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 said specimen of cortical bone.
Claims13
An orthopedic fastener comprising:
- a cylindrical shank having 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;
- the thread root transition zone 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 said specimen of cortical bone.
An orthopedic fastener comprising:
- a cylindrical shank having 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 threaded portion having a substantially uniform thread crest diameter;
- 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;
- the thread root transition zone 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 said specimen of cortical bone.
An orthopedic fastener comprising:
- a cylindrical shank having 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 threaded portion having a varying thread crest diameter;
- 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;
- the thread root transition zone 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 said specimen of cortical bone.
Dependencies are inferred from the claim text.