Abstract: A polyaxial bone anchoring device is provided including a bone anchoring element (1) comprising a head (3) and a shank (2); a receiving part (4, 4?) for receiving a rod (100) for coupling the rod to the bone anchoring element, the receiving part comprising a first end (4a), an opposite second end (4b) and a central axis (C) extending through the first end and the second end, and a channel (9) for receiving the rod and an accommodation space (11) for receiving the head; a pressure element (6, 6?) arranged in the receiving part and configured to exert pressure onto the head; wherein the pressure element (6) comprises flexible sections (66a, 66b) facing away from the head (3), characterized in that the flexible sections (66a, 66b) comprise a free end portion (69a, 69b) with respect to the central axis (C) that cooperates with an inclined surface portion (15a, 15b) of the receiving part (4) such as to hold the pressure element (6) in a position in which it exerts a pre-load onto the head before the head is lo

Abstract: A coupling assembly for coupling a rod to a bone anchoring element is provided, wherein the coupling assembly includes a receiving part having a first end, a second end, a central axis extending through the first end and second end, an accommodation space for accommodating a head of an anchoring element, a bore extending from the accommodation space to the first end, and a recess for receiving a rod. The accommodation space has an opening at the second end sized to permit insertion of a head of the bone anchoring element. The coupling assembly further includes a retainer element configured to be positioned at least partially in the accommodation space and being radially expandable and/or compressible to allow retaining a head inserted through the opening. The retainer element is held in position adjacent the opening by an engagement structure provided at or in the accommodation space.

Abstract: A polyaxial bone anchoring device includes a receiving part with two legs defining a recess for receiving a rod and a pressure member for exerting pressure on a head of a bone anchoring element in the receiving part, the pressure member having an engagement portion. The engagement portion can extend at least partially into a leg and is directly engageable from outside the bone anchoring device to move the engagement portion axially for adjusting the pressure member from a non-locking position where the head is pivotable to a locking position where the head is clamped. When the pressure member is in the locking position and the engagement portion is free from any outside axial forces, a first contact surface of the receiving part cooperates with a second contact surface of the pressure member to hold the pressure member in the locking position.

Abstract: A polyaxial bone anchoring device includes: an anchoring element having a shaft for anchoring in a bone and a head, the head having a spherically-shaped outer surface portion; a receiving part configured to be pivotably connected to the head, the receiving part having a top end and a bottom end, a longitudinal axis extending through the top end and the bottom end, a channel transverse to the longitudinal axis for receiving a rod, and an accommodation space for accommodating the head, the accommodation space having a lower opening at the bottom end, a sleeve-like insert piece configured to be positioned around a portion of the head and to pivot in the receiving part, the insert piece having a spherically-shaped outer surface portion, wherein a lower edge of the insert piece extends past the lower opening in a direction away from the receiving part when the insert piece is seated in the receiving part in a position in which a central axis of the insert piece is coaxial with the longitudinal axis, and wherein th

Abstract: A receiving part for receiving a rod for coupling the rod to a bone anchoring element includes a receiving part body including a first end and a second end, and having a substantially U-shaped recess at the first end forming a channel for receiving the rod, and an accommodation space for accommodating a head of the bone anchoring element, the accommodation space having an opening at the second end for introducing the head; and a pressure element arranged at least partially in the accommodation space, the pressure element including a first section having a second recess for receiving the rod, and a second section having a flexible portion to clamp the head, the first section and the second section being fixed relative to each other, wherein said pressure element is insertable from the opening.

Abstract: A dynamic bone anchor includes an anchor member having a tubular body with a first end and a second end, the anchor member defining an anchor axis including a plurality of barb elements, and being made at least partially of a nickel-titanium (Ni—Ti) based shape memory alloy. The dynamic bone anchor also including a core member configured to be inserted from the first end through the second end such that a first portion of the core number extends out from the first end, and a second portion of the core number extends out from the second end. The anchor member and the core member are configured such that when assembled, the first portion of the core member is spaced apart from the anchor member and movable with respect to it, and the second portion of the core member is fixed to and movable together with the anchor member.

Abstract: A receiving part for receiving a rod for coupling the rod to a bone anchoring element, the receiving part including: a receiving part body having a channel for receiving a rod and defining an accommodation space for accommodating a head of a bone anchoring element, the accommodation space having an opening for inserting the head; and a pressure element at least partially in the accommodation space, the pressure element including a first portion having a recess to receive the rod, and a second portion having a flexible portion to clamp the head, wherein the pressure element is moveable along a longitudinal axis of the receiving part body from an inserting position to insert the head, to a pre-locking position to clamp the head in the receiving part by a pre-stress exerted by the pressure element, to a locking position to lock the head in the receiving part.

Abstract: A placeholder for vertebrae or vertebral discs includes a tubular body, which along its jacket surface has a plurality of breakthroughs or openings for over-growth with adjacent tissue. The placeholder includes at least a second tubular body provided with a plurality of breakthroughs and openings at least partially inside the first tubular body. The first and second tubular bodies can have different cross-sectional shapes, can be are arranged inside one another by press fit or force fit or can be connected to each other via connecting pins and arranged side by side to one another in the first body.

Abstract: A coupling assembly for coupling a rod to a bone anchoring element is provided, wherein the coupling assembly includes a receiving part having a first end, a second end, a central axis extending through the first end and second end, an accommodation space for accommodating a head of an anchoring element, a bore extending from the accommodation space to the first end, and a recess for receiving a rod. The accommodation space has an opening at the second end sized to permit insertion of a head of the bone anchoring element. The coupling assembly further includes a retainer element configured to be positioned at least partially in the accommodation space and being radially expandable and/or compressible to allow retaining a head inserted through the opening. The retainer element is held in position adjacent the opening by an engagement structure provided at or in the accommodation space.

Abstract: A device for placing a receiving part of a bone anchoring device onto a head of a bone anchoring element includes a holding portion, a collet configured to be held by the holding portion, the collet having a tubular body extending along a longitudinal axis, and a distal end portion configured to be flexibly expanded and compressed in a radial direction, and a plunger configured to be positioned in the collet. The collet is movable axially relative to the plunger between a first position wherein the distal end portion of the collet is configured to have a first width in a first radial direction and the plunger prevents the distal end portion from assuming a width less than the first width, and a second position wherein the distal end portion of the collet is radially compressible to a second width that is less than the first width.

Abstract: A receiving part for receiving a rod for coupling the rod to a bone anchoring element, the receiving part including: a receiving part body having a channel for receiving a rod and defining an accommodation space for accommodating a head of a bone anchoring element, the accommodation space having an opening for inserting the head; and a pressure element at least partially in the accommodation space, the pressure element including a first portion having a recess to receive the rod, and a second portion having a flexible portion to clamp the head, wherein the pressure element is moveable along a longitudinal axis of the receiving part body from an inserting position to insert the head, to a pre-locking position to clamp the head in the receiving part by a pre-stress exerted by the pressure element, to a locking position to lock the head in the receiving part.

Abstract: A coupling device is provided for coupling a rod to a bone anchoring element. The coupling device includes a receiving part having a first end, a second end, a central axis extending through the first end and the second end, and a channel for receiving a rod. The receiving part defines an accommodation space for accommodating a head of a bone anchoring element, the accommodation space having an opening for inserting the head. The coupling device further includes a pressure element arranged at least partially in the accommodation space, the pressure element having a flexible portion to clamp an inserted head, and a clamping element extending at least partially around the flexible portion of the pressure element. The clamping element is configured to move from a first position to a second position in which the clamping element exerts a clamping force onto the pressure element, where the movement includes rotating the clamping element around the central axis.

Abstract: A polyaxial bone anchoring device includes a receiving part having a longitudinal axis, a channel for receiving a rod, and an accommodation space for pivotably holding a head of a bone anchoring element, and a pressure member configured to be positioned in the receiving part and to exert pressure onto the head to lock the head in the receiving part. The pressure member includes a pressure exerting surface and a deformable portion having a free end, wherein the deformable portion is configured to assume at least a first configuration and a second configuration. The polyaxial bone anchoring device further includes a locking member configured to be inserted into the channel and to exert a force onto the deformable portion.

Abstract: A coupling device is provided for coupling a rod to a bone anchoring element. The coupling device includes a receiving part having a first end, a second end, a central axis extending through the first end and the second end, and a channel for receiving a rod. The receiving part defines an accommodation space for accommodating a head of a bone anchoring element, the accommodation space having an opening for inserting the head. The coupling device further includes a pressure element arranged at least partially in the accommodation space, the pressure element having a flexible portion to clamp an inserted head, and a clamping element extending at least partially around the flexible portion of the pressure element. The clamping element is configured to move from a first position to a second position in which the clamping element exerts a clamping force onto the pressure element, where the movement includes rotating the clamping element around the central axis.

Abstract: A bone anchoring device includes a receiving part including a rod receiving portion with a first end, a second end, and a U-shaped recess for receiving a rod, the recess defining two free legs, and a head receiving portion at the second end for introducing and clamping the head, and a locking ring configured to be arranged around the head receiving portion, the locking ring including an engagement structure for engagement with a tool, the engagement structure defining a width of the locking ring that is greater than a greatest width of the rod receiving portion, wherein the locking ring can assume a locking position exerting a greatest compressive force on the head receiving portion of the receiving part to lock an inserted head, and wherein the locking ring is movable out of the locking position towards the first end of the rod receiving portion.

Abstract: A polyaxial bone anchoring device includes a receiving part having a longitudinal axis, a channel for receiving a rod, and an accommodation space for pivotably holding a head of a bone anchoring element, and a pressure member configured to be positioned in the receiving part and to exert pressure onto the head to lock the head in the receiving part. The pressure member includes a pressure exerting surface and a deformable portion having a free end, wherein the deformable portion is configured to assume at least a first configuration and a second configuration. The polyaxial bone anchoring device further includes a locking member configured to be inserted into the channel and to exert a force onto the deformable portion.

Abstract: A receiving part of a bone anchoring device is provided, where the receiving part includes a first end, a second end opposite to the first end, a central axis extending through the first end and the second end, and a substantially U-shaped-recess adjacent to the first end for receiving a spinal fixation element. The substantially U-shaped recess forms two free legs. The receiving part also includes a bore extending from the first end towards the second end and in communication with the substantially U-shaped recess. A groove is provided in an outer surface of each of the legs, where the groove has a first end and a second end and extends in a circumferential direction in an arcuate shape between the first end of the groove and the second end of the groove.

Abstract: A bone anchoring device includes a receiving part for coupling a rod to a bone anchoring element, the receiving part having a first end, a second end, a recess at the first end for receiving the rod, and a compressible head receiving portion at the second end for accommodating a head of the bone anchoring element, a pressure member positionable in the receiving part to exert pressure on the head, and a clamping ring positionable around the head receiving portion and movable towards the first end of the receiving part to a locking position where the clamping ring exerts force on and compresses the head receiving portion. In the locking position, at least part of the clamping ring that faces the first end of the receiving part is exposed to the outside to facilitate movement of the clamping ring away from the first end of the receiving part.

Abstract: A bone anchoring device includes a receiving part including a rod receiving portion with a first end, a second end, and a U-shaped recess for receiving a rod, the recess defining two free legs, and a head receiving portion at the second end for introducing and clamping the head, and a locking ring configured to be arranged around the head receiving portion, the locking ring including an engagement structure for engagement with a tool, the engagement structure defining a width of the locking ring that is greater than a greatest width of the rod receiving portion, wherein the locking ring can assume a locking position exerting a greatest compressive force on the head receiving portion of the receiving part to lock an inserted head, and wherein the locking ring is movable out of the locking position towards the first end of the rod receiving portion.

Abstract: A bone anchoring device includes a receiving part for coupling a rod to a bone anchoring element, the receiving part having a first end, a second end, a recess at the first end for receiving the rod, and a compressible head receiving portion at the second end for accommodating a head of the bone anchoring element, a pressure member positionable in the receiving part to exert pressure on the head, and a clamping ring positionable around the head receiving portion and movable towards the first end of the receiving part to a locking position where the clamping ring exerts force on and compresses the head receiving portion. In the locking position, at least part of the clamping ring that faces the first end of the receiving part is exposed to the outside to facilitate movement of the clamping ring away from the first end of the receiving part.