US 11,896,275 B2
Dynamic bone anchor and method of manufacturing a dynamic bone anchor
Lutz Biedermann, VS-Villingen (DE); and Wilfried Matthis, Weisweil (DE)
Assigned to BIEDERMANN TECHNOLOGIES GMBH & CO. KG, Donaueschingen (DE)
Filed by BIEDERMANN TECHNOLOGIES GMBH & CO. KG, Donaueschingen (DE)
Filed on May 28, 2021, as Appl. No. 17/334,387.
Application 17/334,387 is a continuation of application No. 14/098,425, filed on Dec. 5, 2013, granted, now 11,045,237.
Claims priority of provisional application 61/733,793, filed on Dec. 5, 2012.
Claims priority of application No. 12195759 (EP), filed on Dec. 5, 2012.
Prior Publication US 2021/0353342 A1, Nov. 18, 2021
This patent is subject to a terminal disclaimer.
Int. Cl. A61B 17/84 (2006.01); A61B 17/86 (2006.01); A61B 17/70 (2006.01); A61B 17/00 (2006.01)
CPC A61B 17/844 (2013.01) [A61B 17/866 (2013.01); A61B 17/8625 (2013.01); A61B 17/8685 (2013.01); A61B 17/7035 (2013.01); A61B 2017/00862 (2013.01); A61B 2017/8655 (2013.01); F04C 2270/0421 (2013.01); Y10T 29/49826 (2015.01)] 20 Claims
OG exemplary drawing
 
1. A dynamic bone anchor comprising:
an anchor member having a first end, a second end, and an anchor axis extending through the first and second ends, the anchor member comprising a tubular body with an inner surface defining a bore, the inner surface having a first inner width, and a bone engagement structure on at least a portion of an outer surface of the anchor member configured to engage a bone; and
a longitudinal core member having a first portion and a second portion, the second portion extending from the first portion and having a first outer width that defines a greatest outer width of the second portion, wherein the first outer width is greater than the first inner width of the tubular body when the core member is outside the tubular body;
wherein at a first temperature, the inner surface of the tubular body is deformable to increase the first inner width by insertion of the second portion of the core member into the tubular body while the first outer width of the second portion remains constant when inside the tubular body, and wherein at a second temperature greater than the first temperature, a radial force applied by the anchor member on the second portion of the core member is increased to strengthen a connection between the tubular body and the second portion of the core member;
wherein at a first position, the second portion of the core member is received in and fixed axially to the anchor member and contacts and deforms at least a first portion of the inner surface of the tubular body to have the increased first inner width, no part of the inner surface of the tubular body located between the first portion of the inner surface and the second end of the anchor member has an inner width that is less than the increased first inner width, the second portion of the core member and the anchor member are movable together, and the first portion of the core member and the anchor member are movable with respect to each other at the first end of the anchor member.