• Patent Title: Anti-over tightening bone screw fixing arrangement
  • Application No.: US14435102
    Application Date: 2013-09-20
  • Publication No.: US09987064B2
    Publication Date: 2018-06-05
  • Inventor: Harm-Iven Jensen
  • Applicant: FACET-LINK INC.
  • Applicant Address: US NJ Rockaway
  • Assignee: FACE-LINK INC.
  • Current Assignee: FACE-LINK INC.
  • Current Assignee Address: US NJ Rockaway
  • Agency: Morrison & Foerster LLP
  • Priority: EP12007011 20121010
  • International Application: PCT/EP2013/069584 WO 20130920
  • International Announcement: WO2014/056704 WO 20140417
  • Main IPC: A61B17/80
  • IPC: A61B17/80 A61B17/86
Anti-over tightening bone screw fixing arrangement
Abstract:
A fixing arrangement comprises a retaining element and a clamping sleeve which receives a bone screw. The bone screw has a head and a secondary thread and is pivotally mounted in the clamping sleeve. The clamping sleeve has a radially protruding section on the outer casing of the clamping sleeve and at least one track of a clamping thread, which complements the secondary thread, in the interior of the clamping sleeve. In the unclamped state, a free path is formed by a clearance on the clamping sleeve. A protruding section engages into an opening on the receiving seat in a formfitting manner, and the thickened section is shaped to expand towards the rear in the form of a cone. The cone angle is selected such that the free path divided by the tangent of the half-cone angle corresponds to 0.5 to 2.5 times the thread pitch of the secondary thread.
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