Patent ID: 11925396
Assignee: BIEDERMANN TECHNOLOGIES GMBH & CO. KG
Field: Medical technology (Instruments)
Classification: CPC A  F | IPC A  F

Claim 6:
7. 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 extends 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 distal end of the holder having an interior with an internal thread and an opening, and the holder having a radial slot into the interior proximal of the internal thread through which the locking element is side loaded into the holder, the driver adapted to extend within the interior of the holder from the proximal end of the holder to the distal end of the holder, wherein the driver is axially movable and rotatable within the holder to engage the second recess of the side loaded locking element and rotationally advance the locking element through the distal end of the holder in contact with the internal threads and then out of the opening at the distal end of the holder.