Abstract: A polyaxial bone anchoring device includes a receiving part configured to be pivotably connected to a head of an anchoring element, the receiving part having a channel for receiving a rod and an accommodation space having an opening for accommodating the head, and a sleeve-like insert piece having a sleeve axis and a spherical segment-shaped outer surface portion. The insert piece is configured to be positioned around a portion of the head in the receiving part and to pivot in the receiving part, and includes a first part and a separable second part configured to be connected with the first part by a connection structure configured to permit translational movement between the first part and the second part in a direction transverse to the sleeve axis, while preventing movement between the first part and the second part in a direction parallel to the sleeve axis.

Abstract: A polyaxial bone anchoring device includes a receiving part configured to be pivotably connected to a head of an anchoring element, the receiving part having a channel for receiving a rod and an accommodation space having an opening for accommodating the head, and a sleeve-like insert piece having a sleeve axis and a spherical segment-shaped outer surface portion. The insert piece is configured to be positioned around a portion of the head in the receiving part and to pivot in the receiving part, and includes a first part and a separable second part configured to be connected with the first part by a connection structure configured to permit translational movement between the first part and the second part in a direction transverse to the sleeve axis, while preventing movement between the first part and the second part in a direction parallel to the sleeve axis.

Abstract: A bone anchoring device includes an anchoring element having a shaft and a head, a receiving part having a coaxial bore and a seat for receiving the head, a pressure element configured to be movable within the bore, and a preload element being positionable between the head and the pressure element. When the head is inserted in the receiving part, the head is pivotable with respect to the receiving part, and can be locked at an angle relative to the receiving part by the pressure element. The pressure element can assume a position relative to the receiving part where the pressure element and the preload element are in direct contact, and where the pressure element exerts a force onto the head via the preload element to maintain one of a plurality of releasable angular positions between the head and the receiving part by friction before locking the head.

Abstract: A polyaxial bone anchoring device includes a bone anchoring element having a head and a shaft, a receiving part having a head receiving portion, a rod receiving portion, and a bore having a bore axis, and a pressure member movable in the bore and having a first surface for engaging the head, wherein the pressure member is movable to a first position where friction between the first surface and the head generates a preload on the head to maintain the shaft at a temporary angular position relative to the receiving part, and wherein the pressure member is configured to engage the receiving part to generate a holding force for holding the pressure member at the first position without a positive lock, and wherein the pressure member is movable in and out of the first position by applying an axial force on the pressure member greater than the holding force.

Abstract: A bone anchoring device includes an anchoring element having a shaft and a head, a receiving part having a coaxial bore and a seat for receiving the head, a pressure element configured to be movable within the bore, and a preload element being positionable between the head and the pressure element. When the head is inserted in the receiving part, the head is pivotable with respect to the receiving part, and can be locked at an angle relative to the receiving part by the pressure element. The pressure element can assume a position relative to the receiving part where the pressure element and the preload element are in direct contact, and where the pressure element exerts a force onto the head via the preload element to maintain one of a plurality of releasable angular positions between the head and the receiving part by friction before locking the head.

Abstract: A polyaxial bone anchoring device includes a bone anchoring element having a head and a shaft, a receiving part having a head receiving portion, a rod receiving portion, and a bore having a bore axis, and a pressure member movable in the bore and having a first surface for engaging the head, wherein the pressure member is movable to a first position where friction between the first surface and the head generates a preload on the head to maintain the shaft at a temporary angular position relative to the receiving part, and wherein the pressure member is configured to engage the receiving part to generate a holding force for holding the pressure member at the first position without a positive lock, and wherein the pressure member is movable in and out of the first position by applying an axial force on the pressure member greater than the holding force.

Abstract: A polyaxial bone anchoring device includes a receiving part configured to be pivotably connected to a head of an anchoring element, the receiving part having a channel for receiving a rod and an accommodation space having an opening for accommodating the head, and a sleeve-like insert piece having a sleeve axis and a spherical segment-shaped outer surface portion. The insert piece is configured to be positioned around a portion of the head in the receiving part and to pivot in the receiving part, and includes a first part and a separable second part configured to be connected with the first part by a connection structure configured to permit translational movement between the first part and the second part in a direction transverse to the sleeve axis, while preventing movement between the first part and the second part in a direction parallel to the sleeve axis.

Abstract: A polyaxial bone anchoring device includes a receiving part configured to be pivotably connected to a head of an anchoring element, the receiving part having a channel for receiving a rod and an accommodation space having an opening for accommodating the head, and a sleeve-like insert piece having a sleeve axis and a spherical segment-shaped outer surface portion. The insert piece is configured to be positioned around a portion of the head in the receiving part and to pivot in the receiving part, and includes a first part and a separable second part configured to be connected with the first part by a connection structure configured to permit translational movement between the first part and the second part in a direction transverse to the sleeve axis, while preventing movement between the first part and the second part in a direction parallel to the sleeve axis.

Abstract: A bone anchoring device includes an anchoring element having a shaft and a head, a receiving part having a coaxial bore and a seat for receiving the head, a pressure element configured to be movable within the bore, and a preload element being positionable between the head and the pressure element. When the head is inserted in the receiving part, the head is pivotable with respect to the receiving part, and can be locked at an angle relative to the receiving part by the pressure element. The pressure element can assume a position relative to the receiving part where the pressure element and the preload element are in direct contact, and where the pressure element exerts a force onto the head via the preload element to maintain one of a plurality of releasable angular positions between the head and the receiving part by friction before locking the head.

Abstract: A polyaxial bone anchoring device includes a bone anchoring element having a head and a shaft, a receiving part having a head receiving portion, a rod receiving portion, and a bore having a bore axis, and a pressure member movable in the bore and having a first surface for engaging the head, wherein the pressure member is movable to a first position where friction between the first surface and the head generates a preload on the head to maintain the shaft at a temporary angular position relative to the receiving part, and wherein the pressure member is configured to engage the receiving part to generate a holding force for holding the pressure member at the first position without a positive lock, and wherein the pressure member is movable in and out of the first position by applying an axial force on the pressure member greater than the holding force.

Abstract: A polyaxial bone anchoring device includes a bone anchoring element having a head and a shaft, a receiving part having a head receiving portion, a rod receiving portion, and a bore having a bore axis, and a pressure member movable in the bore and having a first surface for engaging the head, wherein the pressure member is movable to a first position where friction between the first surface and the head generates a preload on the head to maintain the shaft at a temporary angular position relative to the receiving part, and wherein the pressure member is configured to engage the receiving part to generate a holding force for holding the pressure member at the first position without a positive lock, and wherein the pressure member is movable in and out of the first position by applying an axial force on the pressure member greater than the holding force.

Abstract: A bone anchoring device includes an anchoring element having a shaft and a head, a receiving part having a coaxial bore and a seat for receiving the head, a pressure element configured to be movable within the bore, and a preload element being positionable between the head and the pressure element. When the head is inserted in the receiving part, the head is pivotable with respect to the receiving part, and can be locked at an angle relative to the receiving part by the pressure element. The pressure element can assume a position relative to the receiving part where the pressure element and the preload element are in direct contact, and where the pressure element exerts a force onto the head via the preload element to maintain one of a plurality of releasable angular positions between the head and the receiving part by friction before locking the head.

Abstract: A polyaxial bone anchoring device includes a bone anchoring element having a head and a shaft, a receiving part having a head receiving portion, a rod receiving portion, and a bore having a bore axis, and a pressure member movable in the bore and having a first surface for engaging the head, wherein the pressure member is movable to a first position where friction between the first surface and the head generates a preload on the head to maintain the shaft at a temporary angular position relative to the receiving part, and wherein the pressure member is configured to engage the receiving part to generate a holding force for holding the pressure member at the first position without a positive lock, and wherein the pressure member is movable in and out of the first position by applying an axial force on the pressure member greater than the holding force.

Abstract: A polyaxial bone anchoring device includes a bone anchoring element having a head and a shaft, a receiving part having a head receiving portion, a rod receiving portion, and a bore having a bore axis, and a pressure member movable in the bore and having a first surface for engaging the head, wherein the pressure member is movable to a first position where friction between the first surface and the head generates a preload on the head to maintain the shaft at a temporary angular position relative to the receiving part, and wherein the pressure member is configured to engage the receiving part to generate a holding force for holding the pressure member at the first position without a positive lock, and wherein the pressure member is movable in and out of the first position by applying an axial force on the pressure member greater than the holding force.

Abstract: A polyaxial bone anchoring device includes a receiving part configured to be pivotably connected to a head of an anchoring element, the receiving part having a channel for receiving a rod and an accommodation space having an opening for accommodating the head, and a sleeve-like insert piece having a sleeve axis and a spherical segment-shaped outer surface portion. The insert piece is configured to be positioned around a portion of the head in the receiving part and to pivot in the receiving part, and includes a first part and a separable second part configured to be connected with the first part by a connection structure configured to permit translational movement between the first part and the second part in a direction transverse to the sleeve axis, while preventing movement between the first part and the second part in a direction parallel to the sleeve axis.

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.

Abstract: A polyaxial bone anchoring device includes a receiving part configured to be pivotably connected to a head of an anchoring element, the receiving part having a channel for receiving a rod and an accommodation space having an opening for accommodating the head, and a sleeve-like insert piece having a sleeve axis and a spherical segment-shaped outer surface portion. The insert piece is configured to be positioned around a portion of the head in the receiving part and to pivot in the receiving part, and includes a first part and a separable second part configured to be connected with the first part by a connection structure configured to permit translational movement between the first part and the second part in a direction transverse to the sleeve axis, while preventing movement between the first part and the second part in a direction parallel to the sleeve axis.

Abstract: A polyaxial bone anchoring device includes a bone anchoring element having a head and a shaft, a receiving part having a head receiving portion, a rod receiving portion, and a bore having a bore axis, and a pressure member movable in the bore and having a first surface for engaging the head, wherein the pressure member is movable to a first position where friction between the first surface and the head generates a preload on the head to maintain the shaft at a temporary angular position relative to the receiving part, and wherein the pressure member is configured to engage the receiving part to generate a holding force for holding the pressure member at the first position without a positive lock, and wherein the pressure member is movable in and out of the first position by applying an axial force on the pressure member greater than the holding force.

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.

Abstract: A polyaxial bone anchoring device includes a bone anchoring element having a head and a shaft, a receiving part having a head receiving portion, a rod receiving portion, and a bore having a bore axis, and a pressure member movable in the bore and having a first surface for engaging the head, wherein the pressure member is movable to a first position where friction between the first surface and the head generates a preload on the head to maintain the shaft at a temporary angular position relative to the receiving part, and wherein the pressure member is configured to engage the receiving part to generate a holding force for holding the pressure member at the first position without a positive lock, and wherein the pressure member is movable in and out of the first position by applying an axial force on the pressure member greater than the holding force.