The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 24, 2012
Filed:
Oct. 25, 2005
André Schlienger, Arlesheim, CH;
Peter Senn, Waldenburg, CH;
André Schlienger, Arlesheim, CH;
Peter Senn, Waldenburg, CH;
Synthes USA, LLC, West Chester, PA (US);
Abstract
The invention concerns a bone screw having a distal end and a proximal end, which has the distinguishing features a shaft with a core diameter 'k' and having an external thread with an external diameter 'd'. The external diameter “d” of the thread or the core diameter “k” of the shaft tapers in a middle region of the shaft from a larger dimension “d” or “k” respectively towards the proximal end to a smaller dimension “d” or “k”, respectively, where “d” and “k” do not equal zero. Further, the shaft is provided with a concentrically disposed, radially expandable sleeve, and the sleeve being positioned on the part of the shaft which has the smaller external diameter “d”. The bone screw may be introduced into a transverse borehole of a medullary pin. The medullary pin is provided with a continuous cannulation, which extends coaxially with the longitudinal axis of the medullary pin and has an external diameter Dand a wall thickness W. The transverse borehole may have a diameter D, which is larger than das well as larger than d. In one embodiment, diameter Dmay be approximately 90% of the diameter dof the sleeve. The sleeve may be inserted completely into the transverse borehole and, with the flange, is in contact with the wall of a facet of the transverse borehole.