Locking element for a polyaxial bone anchor, bone plate assembly and tool
AssigneeBiedermann Technologies GmbH & Co. KG
InventorMarkku Biedermann
Life of this patent
Estimating the term…
Abstract
A tool adapted for use with a bone plate assembly includes a driver with an engagement portion configured to engage a locking element, and a tubular holder. The driver may be configured to extend with the engagement portion through the tubular holder, and may be axially movable and rotatable within the holder. The holder may have a radial slot adapted for insertion of the locking element. The holder may include a portion with an internal thread for cooperation with an external thread of the locking element. The locking element may be used with a polyaxial bone anchor.
Claims16
A tool for use with a locking element, comprising:
- an elongate driver having a proximal end and a distal end, and a longitudinal central axis extending from the proximal end to the distal end, the distal end having an engagement portion configured to engage the locking element;
- and
- an elongate tubular holder having a proximal end and a distal end, the driver adapted to extend within the holder from proximal end of the holder to the disal end of the holder, wherein the driver is axially movable and rotatable within the holder.
A locking system for use with a bone plate having a screw hole with a threaded upper portion and a screw seat in which a polyaxial bone anchor having a head is received, the locking system comprising:
- a) a locking element including a central axis, a bottom side, a top side opposite to the bottom side, and a peripheral surface portion that extending completely around the locking element that has an external thread, wherein
- the bottom side defines a first recess facing toward the bottom side for accommodating and applying a force in a direction toward the bottom side to the head of the polyaxial bone anchor, and
- the top side defines a second recess off the central axis and having a non-circular cross-section in a plane perpendicular to the central axis;
- b) a tool, including
- an elongate driver having a proximal end and a distal end, the distal end having an engagement portion configured to engage the second recess of the locking element, and
- an elongate tubular holder having a proximal end and a distal end, the driver adapted to extend within the holder from proximal end of the holder to the disal end of the holder, wherein the driver is axially movable and rotatable within the holder to apply torque to the locking element.
A locking system for use with a bone plate having a screw hole with a threaded upper portion and a screw seat in which a polyaxial bone anchor having a head is received, the locking system comprising:
- a) a locking element including a central axis, a bottom side, a top side opposite to the bottom side, and a peripheral surface portion that extending completely around the locking element that has an external thread, wherein
- the bottom side defines a first recess facing toward the bottom side for accommodating and applying a force in a direction toward the bottom side to the head of the polyaxial bone anchor, and
- the top side defines a second recess;
- b) a tool, including
- an elongate driver having a proximal end and a distal end, the distal end having an engagement portion configured to engage the second recess of the locking element, and
- an elongate tubular holder having a proximal end and a distal end, the distal end of the holder having an internal thread that threadedly engages the external thread of the locking element, and the holder having a radial slot proximal of the internal thread through which to receive the locking element,
- the driver adapted to extend within the holder from proximal end of the holder to the disal end of the holder, wherein the driver is axially movable and rotatable within the holder to apply torque to the locking element.
Dependencies are inferred from the claim text.