Depuy Synthes Products, Inc.

Synthes USA, LLC

Synthes Gmbh

Andre Schlienger

Markus Buettler

Peter Senn

Robert Frigg

Mario Rigert

Etienne Furrer

Rainer Ponzer

Bryan James Griffiths

Samuel Leuenberger

Robert J Schoutens

Marcel Muther

Markus Büttler

Marcello Memmolo

Kai Stephan

Daniela Pricope

Dankward Höntzsch

Christian Raehle

Robert Schoutens

Bryan Griffiths

Daniela Kappeli

Senn Peter

Expandable fixation assemblies, expandable cranial fixation assemblies, and expandable intervertebral implant assemblies are provided for securing structures to bone and for securing bones and/or bone segments with respect to each other. An expansion member can be moved through at least a portion of an expandable fixation body, thereby causing expansion of the expandable fixation body, such that bone engagement features of the expandable fixation body engage surrounding structure, such as bone.

Expandable fixation assemblies

An intramedullary nail includes an elongated body extending along a central longitudinal axis. The intramedullary nail includes a straight proximal end portion along with a straight distal end portion extending proximally from a distal end of the nail by a predetermined length and a central portion extending proximally from a proximal end of the distal end portion to a distal end of the proximal end portion. The central portion includes a first curved portion having a first length with a first radius of curvature and a second curved portion having a second length shorter than the first length and a second, non-zero radius of curvature smaller than the first radius of curvature.

Intramedullary nail

An intramedullary nail includes (a) a longitudinal nail body extending from a proximal end to a distal end and having a central longitudinal axis and a diameter D, the nail body being configured for insertion into a medullary cavity of a bone, the nail body having a proximal portion and a distal portion longitudinally separated from one another; (b) a first transverse hole extending through the distal portion of the nail body at an angle transverse to the central longitudinal axis and defining a first transverse hole axis, the first transverse hole axis being offset from the central longitudinal axis of the nail body; and (c) a second transverse hole extending through the distal portion of the nail body at an angle transverse to the central longitudinal axis and defining a second transverse hole axis. The first transverse hole axis intersects the second transverse hole axis.

The invention relates to an intramedullary nail () having a proximal half (), a distal half () adapted for insertion into the medullary canal, and a central axis (), whereby the distal half () includes three transverse bores () suitable for receiving locking screws (). The distal half () is provided with a proximal transverse bore () having a bore axis (), a central transverse bore () having a bore axis (), and a distal transverse bore () having a bore axis () spaced along the central axis (). The bore axis () of the central transverse bore (), which extends between the proximal transverse bore () and the distal transverse bore (), is spaced at a shortest distance 'a' from the bore axis () of the proximal transverse bore (), and at a shortest distance 'b' from the bore axis () of the distal transverse bore (), where a&#x2260;b.

An intramedullary nail, particular for use with a tibia, may have a proximal end part, a distal end part adapted to be introduced into a medullary space, and a central section. The central section includes a first curved section having a first length with a first radius of curvature, and a second curved section having a second length shorter than the first length and a second radius of curvature smaller than the first radius of curvature. The second radius of curvature may be less than the first radius of curvature. The intramedullary nail also includes a central axis. Tangents at two end points of the central section, including the first and second curved sections, enclose an angle gamma between about 9&#xb0; and about 12&#xb0;. The intramedullary nail may have a total length ranging from 200 to 500 mm.

An intramedullary nail having a distal end is introducible into a medullary space. A medullary nail segment which is oriented towards the distal end and has a diameter D, a proximal end, at least two cross holes having a borehole axis and a central line formed by a line connecting centers of gravity of the axially successive transversal surfaces orthogonal with respect to the intramedullary nail, without taking into account the cross holes. The borehole axis of at least one cross-hole is shifted at a gap d&#x3e;0 with respect to the central line.

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Basel, Switzerland

Andre Schlienger