Bone anchoring device, tool and method for assembling the same and tool for use with the same

Patent metadata

Field	Value
Publication number	US-9254150-B2
Application number	US-85625110-A
Country	US
Kind code	B2
Filing date	Aug 13, 2010
Priority date	Aug 20, 2009
Publication date	Feb 9, 2016
Grant date	Feb 9, 2016

Abstract

A bone anchoring device includes an anchoring element having a shaft for anchoring in the bone and a head, a receiving part formed in one piece, and a pressure element formed in one piece. The receiving part has a seat for receiving the head and an outer channel for receiving a rod to be connected to the anchoring element, which is pivotable with respect to the receiving part and can be fixed at an angle by exerting pressure via the pressure element onto the head. The pressure element is movable in the receiving part and includes an inner channel for receiving the rod and a spring element that engages a portion of the receiving part via a detent connection so that the pressure element can be held in a position that allows pivoting of the anchoring element. The spring element is formed by at least a first portion of one of two side walls forming the inner channel, the first portion being spaced apart from a second portion of the one side wall by a slot. At least a portion of the detent connection is located on the one side wall.

First claim

What is claimed is:

1. A bone anchoring device comprising:
an anchoring element having a shaft for anchoring to a bone and having a head;
a receiving part formed in one piece, the receiving part comprising a seat for receiving the head and a channel for receiving a rod to be connected to the bone anchoring device;
a pressure element formed in one piece, the pressure element being movable in the receiving part to exert pressure onto the head when the head and the pressure element are in the receiving part; and
wherein the anchoring element is pivotable with respect to the receiving part and is configured to be fixed at an angle by exerting pressure via the pressure element onto the head;
wherein the pressure element comprises a substantially U-shaped recess defining two side walls to receive the rod therebetween;
wherein the pressure element further comprises a spring element on each of the two side walls, each spring element being monolithic with an outer wall portion of a respective side wall and comprising a detent portion configured to engage a portion of the receiving part so that the pressure element is configured to be held in a position that allows pivoting of the anchoring element; and
wherein each spring element on a first the outer wall portion of its respective side wall is spaced apart from an inner wall portion of its respective side wall by a slot.

2. The bone anchoring device of claim 1 , wherein the receiving part comprises a recess formed at an inner wall of the receiving part and wherein, for at least one of the spring elements, the detent is configured to be resiliently depressed radially inward into the slot and to engage the recess.

3. The bone anchoring device of claim 2 , wherein, for the at least one spring element, the detent is shaped asymmetrically with respect to a direction of movement of the pressure element so as to allow assembly of the pressure element in the receiving part and to inhibit disassembly of the pressure element from the receiving part.

4. The bone anchoring device of claim 3 , wherein, for the at least one spring element, the detent comprises an edge that is configured to abut a wall defining the recess formed at the inner wall of the receiving part.

5. The bone anchoring element of claim 2 , wherein, for the at least one spring element, the detent is symmetrical with respect to a direction of movement of the pressure element to allow assembly and disassembly of the pressure element to and from the receiving part, respectively.

6. The bone anchoring device of claim 1 , wherein, for at least one of the spring elements, the slot is defined by a top surface and a bottom surface at opposite ends along an axis in a direction of a central axis of the pressure element, wherein the slot is closed at the top surface and/or the bottom surface.

7. The bone anchoring device of claim 6 , wherein, for the at least one spring element, the slot is closed at the bottom surface.

8. The bone anchoring device of claim 1 , further comprising a rod, wherein the two side walls each have free ends, wherein the free ends are each configured to extend beyond the rod when the rod is received in the U-shaped recess and wherein, for at least one of the spring elements, the slot extends beyond the rod on its respective side wall when the rod is received in the U-shaped recess.

9. The bone anchoring device of claim 1 , wherein the receiving part comprises a first bore for passing the shaft of the anchoring element therethrough and a second bore for introducing the shaft and the head.

10. The bone anchoring device of claim 1 , wherein a locking device is provided that is configured to cooperate with the receiving part to lock the head and the rod separately when the head and the rod are in the receiving part.

11. The bone anchoring device of claim 1 , wherein a locking device is provided that is configured to cooperate with the receiving part to lock the head and the rod simultaneously when the head and the rod are in the receiving part.

12. The bone anchoring device of claim 1 , wherein, for at least one of the spring elements, the slot extends to an exterior surface of the pressure element.

13. A bone anchoring device comprising:
an anchoring element having a shaft for anchoring to a bone and having a head;
a receiving part formed in one piece, the receiving part comprising a seat for receiving the head and a channel for receiving a rod to be connected to the bone anchoring device, the channel formed by an inner wall and the inner wall defining a bore;
a pressure element formed in one piece, the pressure element being movable in the receiving part and configured to exert pressure onto the head when the head and the pressure element are in the receiving part, the pressure element comprising a substantially U-shaped recess defining a bottom and two side walls to receive the rod therebetween; and
wherein the anchoring element is pivotable with respect to the receiving part and is configured to be fixed at an angle by exerting pressure via the pressure element onto the head;
wherein the pressure element further comprises a spring element on an outer wall portion of one of the side walls, the spring element spaced apart from an inner wall portion of the one side wall by a slot, the spring element having a detent that protrudes from the spring element toward the inner wall of the receiving part when assembled in the channel of the receiving part;
wherein the spring element is movable from a first position wherein the spring element is unlocked from the receiving part, to a second position wherein the spring element is locked to the receiving part via the detent of the pressure element being located in the bore of the receiving part, wherein in the second position the pressure element is held in a position that allows pivoting of the anchoring element; and
wherein at least a portion of the detent is located above the bottom of the U-shaped recess.

14. The bone anchoring device of claim 13 , wherein the entire detent is located above the bottom of the U-shaped recess.

15. A method of assembling a bone anchoring device using a tool, the bone anchoring device comprising:
an anchoring element having a shaft for anchoring to a bone and having a head;
a receiving part formed in one piece, the receiving part comprising a seat for receiving the head and a channel for receiving a rod to be connected to the bone anchoring device, the channel formed by an inner wall and the inner wall defining a bore;
a pressure element formed in one piece, the pressure element being movable in the receiving part to exert pressure onto the head when the head and the pressure element are in the receiving part, the pressure element comprising a substantially U-shaped recess defining a bottom and two side walls to receive the rod therebetween; and
wherein the anchoring element is pivotable with respect to the receiving part and is configured to be fixed at an angle by exerting pressure via the pressure element onto the head;
wherein the pressure element further comprises a spring element on an outer wall portion of one of the side walls, the spring element spaced apart from an inner wall portion of the one side wall by a slot, the spring element having a detent that protrudes from the spring element toward the inner wall of the receiving part when assembled in the channel of the receiving part;
wherein the spring element is movable from a first position wherein the spring element is unlocked from the receiving part, to a second position wherein the spring element is locked to the receiving part via of the pressure element being l

Assignees

• Biedermann Lutz
• Meer Martin
• Biedermann Technologies Gmbh

Inventors

• Biedermann Lutz
• Meer Martin

Classifications

• A61B2017/00716

  simulating physical properties · CPC title

• A61B17/7037 Primary

  wherein pivoting is blocked when the rod is clamped · CPC title

• A61B17/7035

  Screws or hooks, wherein a rod-clamping part and a bone-anchoring part can pivot relative to each other · CPC title

• A61B2017/00526

  Methods of manufacturing · CPC title

• A61B17/7032

  Screws or hooks with U-shaped head or back through which longitudinal rods pass · CPC title