Anchoring element and stabilization device for the dynamic stabilization of vertebrae or bones using such anchoring elements
AssigneeBiedermann Technologies GmbH & Co. KG
InventorsLutz Biedermann, Jürgen Harms, Wilfried Matthis
Life of this patent
Estimating the term…
Abstract
An anchoring element for a stabilization device for bones or vertebrae, with which a bone or vertebra can be connected to a rod-shaped element is described. By providing for at least one degree of rotational freedom between the rod and an anchoring element that is firmly connected to the bone or vertebra, the transfer of torque (M) onto the anchoring element and can be prevented as well as loosening or even separation of the bone anchoring element from the bone or vertebra. Moreover, the invention provides a stabilization device, in which such bone anchoring elements are used.
Claims19
An anchoring element for anchoring a rod-shaped element to a bone anchor having a spherical-segment shaped head and a shaft to be anchored to a bone or vertebra, the anchoring element comprising:
- a receiving part configured to be connected to the bone anchor and to receive the rod-shaped element, the receiving part having a spherical-segment shaped seat at one end;
- a bearing element for holding the spherical-segment shaped head of the bone anchor in the receiving part, the bearing element having a spherical-segment shaped outer surface sized to be received in the seat of the receiving part, and a spherical-segment shaped inner recess sized to receive the head of the bone anchor;
- and
- a fixation device for fixing the rod-shaped element in the receiving part.
2-33. (canceled)
A stabilization device comprising at least two anchoring elements and a rod-shaped element for connecting the anchoring elements, wherein the anchoring elements each comprises:
- a bone anchor comprising a spherical-segment shaped head and a shaft;
- a receiving part configured to be connected to the bone anchor and to receive the rod-shaped element, the receiving part having a spherical-segment shaped seat at one end;
- a bearing element for holding the head of the bone anchor in the receiving part, the bearing element having a spherical-segment shaped outer surface sized to be received in the seat of the receiving part, and a spherical-segment shaped inner recess sized to receive the head;
- and
- a fixation device for fixing the rod-shaped element in the receiving part.
A method for coupling a rod-shaped element to a bone via an anchoring element, the anchoring element comprising a bone anchor comprising a spherical-segment shaped bead and a shaft, a receiving part configured to be connected to the bone anchor and to receive the rod-shaped element, the receiving part having a spherical-segment shaped seat at one end, a bearing element for holding the head of the bone anchor in the receiving part, the bearing element having a spherical-segment shaped outer surface sized to be received in the seat of the receiving part, and a spherical-segment shaped inner recess sized to receive the head, and a fixation device for fixing the rod-shaped element in the receiving part, the method comprising:
- inserting the shaft of the bone anchor into a bone when the head of the bone anchor and the bearing element are in the receiving part;
- adjusting a position of the bone anchor relative to the receiving part;
- connecting the rod-shaped element to the receiving part;
- and
- inserting the fixation device in the receiving part to lock the rod-shaped element in the receiving part.
Dependencies are inferred from the claim text.