Device for osteosynthesis

Patent metadata

Field	Value
Publication number	US-9101423-B2
Application number	US-201113150900-A
Country	US
Kind code	B2
Filing date	Jun 1, 2011
Priority date	Jul 21, 2010
Publication date	Aug 11, 2015
Grant date	Aug 11, 2015

Abstract

A device for osteosynthesis includes a body having a proximal surface, a distal surface configured and dimensioned to face a target portion of bone over which the body is to be mounted and a through opening extending through the body from the proximal surface to the distal surface along a central axis. The through hole includes a first protrusion extending from an inner surface thereof toward the central axis. The first protrusion is biased toward an unstressed state in which the first protrusion extends into the through opening to a first distance from the central axis. The first protrusion is movable toward the inner surface when subjected to a force directed outward from the central axis.

First claim

What is claimed is:

1. A device for osteosynthesis, comprising:
a body having a proximal surface, a distal surface configured and dimensioned to face a target portion of bone over which the body is to be mounted and a through opening extending through the body from the proximal surface to the distal surface along a central axis;
a first protrusion extending from an inner surface of the body defining the through opening toward the central axis, wherein the first protrusion includes accordioned layers radially compressible against one another;
an elastically deformable hinge coupling the first protrusion to the inner surface of the through opening, the hinge deforming so that the first protrusion moves toward the inner surface when the first protrusion is subjected to a force directed outward from the central axis.

2. The device according to claim 1 , wherein the first protrusion is movable by at least 2% of the diameter of the through opening.

3. The device according to claim 1 , wherein the first protrusion comprises a first front face facing the central axis, the first protrusion being formed as a part of a circle wherein a circumference of the first front face is less than 360° and, more specifically, in the range of 190° to 220°.

4. The device according to claim 3 , further comprising:
a second protrusion extending from the inner surface toward the central axis, the second protrusion being biased toward an unstressed state in which the second protrusion extends into the through opening to a second distance from the central axis, the second protrusion being movable toward the inner surface when subjected to a force directed outward from the central axis to increase a clearance in the through opening, the second protrusion comprising a second front face facing the central axis, the first and second front faces being circumferentially separated from one another; and
a third protrusion extending from the inner surface toward the central axis, the third protrusion being biased toward an unstressed state in which the third protrusion extends into the through opening to a third distance from the central axis, the third protrusion being movable toward the inner surface when subjected to a force directed outward from the central axis to increase a clearance in the through opening.

5. The device according to claim 4 , wherein a surface area of the first front face is one of equal to and different from a surface area of the second front face area, the first and second front faces combining to cover between one of 50% to 80% and 85% to 98% of a circumferential area of the through opening hole at a distance from the central axis equal to the distance of the first and second front faces therefrom.

6. The device according to claims 5 , wherein the first front face includes a plurality of thread-like structures extending thereacross, a curvature of the first front face extending along a curvature substantially the same as a curvature of the inner wall.

7. The device according to claim 4 , wherein the first and second front faces form part of a virtual body having one of a circular cross-section measured orthogonal to the central axis, a substantially conical virtual body having a cone angle in the range of 5° to 15°, a spherical segment and a cylinder.

8. The device according to claim 3 , wherein the first front face is one of parallel and non-parallel to the central axis.

9. The device according to claim 1 , wherein the hinge and the first protrusion are formed integrally with the inner surface of the through opening.

10. The device according to claim 1 , wherein the through opening has a non-circular cross-section.

11. The device according to claim 1 , wherein the hinge is one of longitudinally aligned with one of the proximal surface and the distal surface of the body and equidistant from the proximal and distal surfaces of the body.

12. A system for osteosynthetic bone fixation, comprising:
a body having a proximal surface, a distal surface configured for placement over a target portion of bone and a through hole extending therethrough from the proximal surface to the distal surface along a central axis;
a first protrusion movably connected to an inner surface of the body defining the through hole;
an elastically deformable hinge coupling the first protrusion to the inner surface of the through hole, the hinge being biased toward an unstressed position, the hinge being deformed upon application against the first protrusion of a force directed radially outward from the central axis so that the first protrusion moves radially outward a predetermined distance toward the inner surface; and
a bone fixation element including a head configured and dimensioned so that, when inserted into the through hole, the head applies a radially outwardly directed force moving the first protrusion radially outward from an unstressed position,
wherein the first protrusion includes accordioned layers radially compressible against one another.

13. The system of claim 12 , wherein a distal portion of the through hole comprises a first slot extending into the inner surface configured and dimensioned to receive a first abutment on an inner wall of the first protrusion, the inner wall being angled relative to the inner surface of the through hole and wherein a proximal portion of the through hole comprises a second slot extending into the inner surface configured and dimensioned to receive a second abutment on the inner wall of the first protrusion and spaced from the second abutment by a predetermined distance in a first biased operative configuration and which contacts the second slot in a second operative configuration when the first protrusion is pushed against the inner surface by a force directed radially outward from the central axis.

14. The system of claim 12 , wherein the first protrusion is connected to the inner surface of the through hole by a tab projecting from the inner surface toward the central axis, the tab being equidistant from the proximal and distal surfaces of the body, wherein proximal and distal inner walls of the first protrusions proximal and distal of the tab are angled relative to the inner surface of the through hole.

15. The system of claim 12 , further comprising second and third protrusions separated from each other and from the first protrusion by a radial groove in the through opening.

16. The system of claim 15 , wherein the head of the bone fixation element includes a threaded portion conforming to threading formed on the first, second and third protrusions.

17. A system for osteosynthetic bone fixation, comprising:
a body having a proximal surface, a distal surface configured for placement over a target portion of bone and a through hole extending therethrough from the proximal surface to the distal surface along a central axis;
a first protrusion movably connected to an inner surface of the body defining the through hole;
an elastically deformable hinge coupling the first protrusion to the inner surface of the through hole, the hinge being biased toward an unstressed position, the hinge being deformed upon application against the first protrusion of a force directed radially outward from the central axis so that the first protrusion moves radially outward a predetermined distance toward the inner surface; and
a bone fixation element including a head configured and dimensioned so that, when inserted into the through hole, the head applies a radially outwardly directed force moving the first protrusion radially outward from an unstressed position,
wherein the first protrusio

Assignees

• Hulliger Urs
• Depuy Synthes Products Inc

Inventors

• Hulliger Urs

Classifications

• A61B17/8057

  the interlocking form comprising a thread · CPC title

• A61B17/8052 Primary

  immobilised relative to screws by interlocking form of the heads and plate holes, e.g. conical or threaded · CPC title