Bone anchoring device, tool and method for assembling the same and tool for use with the same
First Claim
1. A bone anchoring device comprising:
- an anchoring element having a shaft for anchoring to a bone and having a head;
a receiving part formed in one piece, the receiving part comprising a seat for receiving the head and a channel for receiving a rod to be connected to the bone anchoring device;
a pressure element formed in one piece, the pressure element being movable in the receiving part to exert pressure onto the head when the head and the pressure element are in the receiving part; and
wherein the anchoring element is pivotable with respect to the receiving part and is configured to be fixed at an angle by exerting pressure via the pressure element onto the head;
wherein the pressure element comprises a substantially U-shaped recess defining two side walls to receive the rod therebetween;
wherein the pressure element further comprises a spring element on each of the two side walls, each spring element being monolithic with an outer wall portion of a respective side wall and comprising a detent portion configured to engage a portion of the receiving part so that the pressure element is configured to be held in a position that allows pivoting of the anchoring element; and
wherein each spring element on a first the outer wall portion of its respective side wall is spaced apart from an inner wall portion of its respective side wall by a slot.
2 Assignments
0 Petitions
Accused Products
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. At least a portion of the detent connection is located on the one side wall.
79 Citations
18 Claims
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1. A bone anchoring device comprising:
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an anchoring element having a shaft for anchoring to a bone and having a head; a receiving part formed in one piece, the receiving part comprising a seat for receiving the head and a channel for receiving a rod to be connected to the bone anchoring device; a pressure element formed in one piece, the pressure element being movable in the receiving part to exert pressure onto the head when the head and the pressure element are in the receiving part; and wherein the anchoring element is pivotable with respect to the receiving part and is configured to be fixed at an angle by exerting pressure via the pressure element onto the head; wherein the pressure element comprises a substantially U-shaped recess defining two side walls to receive the rod therebetween; wherein the pressure element further comprises a spring element on each of the two side walls, each spring element being monolithic with an outer wall portion of a respective side wall and comprising a detent portion configured to engage a portion of the receiving part so that the pressure element is configured to be held in a position that allows pivoting of the anchoring element; and wherein each spring element on a first the outer wall portion of its respective side wall is spaced apart from an inner wall portion of its respective side wall by a slot. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A bone anchoring device comprising:
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an anchoring element having a shaft for anchoring to a bone and having a head; a receiving part formed in one piece, the receiving part comprising a seat for receiving the head and a channel for receiving a rod to be connected to the bone anchoring device, the channel formed by an inner wall and the inner wall defining a bore; a pressure element formed in one piece, the pressure element being movable in the receiving part and configured to exert pressure onto the head when the head and the pressure element are in the receiving part, the pressure element comprising a substantially U-shaped recess defining a bottom and two side walls to receive the rod therebetween; and wherein the anchoring element is pivotable with respect to the receiving part and is configured to be fixed at an angle by exerting pressure via the pressure element onto the head; wherein the pressure element further comprises a spring element on an outer wall portion of one of the side walls, the spring element spaced apart from an inner wall portion of the one side wall by a slot, the spring element having a detent that protrudes from the spring element toward the inner wall of the receiving part when assembled in the channel of the receiving part; wherein the spring element is movable from a first position wherein the spring element is unlocked from the receiving part, to a second position wherein the spring element is locked to the receiving part via the detent of the pressure element being located in the bore of the receiving part, wherein in the second position the pressure element is held in a position that allows pivoting of the anchoring element; and wherein at least a portion of the detent is located above the bottom of the U-shaped recess. - View Dependent Claims (14)
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15. A method of assembling a bone anchoring device using a tool, the bone anchoring device comprising:
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an anchoring element having a shaft for anchoring to a bone and having a head; a receiving part formed in one piece, the receiving part comprising a seat for receiving the head and a channel for receiving a rod to be connected to the bone anchoring device, the channel formed by an inner wall and the inner wall defining a bore; a pressure element formed in one piece, the pressure element being movable in the receiving part to exert pressure onto the head when the head and the pressure element are in the receiving part, the pressure element comprising a substantially U-shaped recess defining a bottom and two side walls to receive the rod therebetween; and wherein the anchoring element is pivotable with respect to the receiving part and is configured to be fixed at an angle by exerting pressure via the pressure element onto the head; wherein the pressure element further comprises a spring element on an outer wall portion of one of the side walls, the spring element spaced apart from an inner wall portion of the one side wall by a slot, the spring element having a detent that protrudes from the spring element toward the inner wall of the receiving part when assembled in the channel of the receiving part; wherein the spring element is movable from a first position wherein the spring element is unlocked from the receiving part, to a second position wherein the spring element is locked to the receiving part via of the pressure element being located in the bore of the receiving part, wherein in the second position the pressure element is held in a position that allows pivoting of the anchoring element; and wherein at least a portion of the detent is located above the bottom of the U-shaped recess, and the tool comprising a base portion and a dummy rod portion, the dummy rod portion being connectable to the pressure element, the method comprising the steps; arranging the tool in a position in which the dummy rod portion is exposed from the base portion; connecting the dummy rod portion with the pressure element; placing the receiving part onto the pressure element; and pressing the receiving part against the base portion until the spring element engages the receiving part.
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16. A method for inserting a bone anchoring device into a bone using a tool, the bone anchoring device comprising:
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an anchoring element having a shaft for anchoring to a bone and having a head; a receiving part formed in one piece, the receiving part comprising a seat for receiving the head and a channel for receiving a rod to be connected to the bone anchoring device, the channel formed by an inner wall and the inner wall defining a bore; a pressure element formed in one piece, the pressure element being movable in the receiving part to exert pressure onto the head when the head and the pressure element are in the receiving part, the pressure element comprising a substantially U-shaped recess defining a bottom and two side walls to receive the rod therebetween; and wherein the anchoring element is pivotable with respect to the receiving part and is configured to be fixed at an angle by exerting pressure via the pressure element onto the head; wherein the pressure element further comprises a spring element on an outer wall portion of one of the side walls, the spring element spaced apart from an inner wall portion of the one side wall by a slot, the spring element having a detent that protrudes from the spring element toward the inner wall of the receiving part when assembled in the channel of the receiving part; wherein the spring element is movable from a first position wherein the spring element is unlocked from the receiving part, to a second position wherein the spring element is locked to the receiving part via the detent of the pressure element being located in the bore of the receiving part, wherein in the second position the pressure element is held in a position that allows pivoting of the anchoring element; and wherein at least a portion of the detent is located above the bottom of the U-shaped recess, and the tool comprising;
a drive member rotatably connected to a counter-holding member, wherein the drive member is sized to extend through the counter-holding member and the receiving part into a head recess on the head, the tool further comprising a stop preventing an escaping movement of the pressure element,the method comprising the steps of; introducing the anchoring element into the receiving part until the head is seated in the seat, introducing the pressure element into the receiving part and aligning the U-shaped recess and the channel for receiving the rod, engaging the counter-holding member with the receiving part, contacting the stop with the pressure element, engaging the drive member with the head recess, and driving the shaft into the bone.
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17. A bone anchoring device comprising:
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an anchoring element having a shaft for anchoring to a bone and having a head; a receiving part formed in one piece, the receiving part comprising a seat for receiving the head and a channel for receiving a rod to be connected to the bone anchoring device; a pressure element formed in one piece, the pressure element being movable in the receiving part and configured to exert pressure onto the head, the pressure element comprising a substantially U-shaped recess defining a bottom and two side walls to receive the rod therebetween; and wherein the anchoring element is pivotable with respect to the receiving part and configured to be fixed at an angle by exerting pressure via the pressure element onto the head; wherein the pressure element comprises a spring element configured to engage a portion of the receiving part so that the pressure element can be held in a position that allows pivoting of the anchoring element; and wherein the spring element is monolithic with an outer wall portion of one side wall of the two side walls and the spring element is spaced apart from an inner wall portion of the one side wall by a slot, the slot being entirely closed when viewed in a cross-section through the bottom and the two side walls of the pressure element.
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18. A bone anchoring device comprising:
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an anchoring element having a shaft for anchoring to a bone and having a head; a receiving part formed in one piece, the receiving part comprising a seat for receiving the head and a channel for receiving a rod to be connected to the bone anchoring device; a pressure element formed in one piece, the pressure element being movable in the receiving part and configured to exert pressure onto the head when the head and the pressure element are in the receiving part, the pressure element comprising a substantially U-shaped recess defining a curved bottom wall and two straight side walls to receive the rod therebetween; and wherein the anchoring element is pivotable with respect to the receiving part and is configured to be fixed at an angle by exerting pressure via the pressure element onto the head; wherein the pressure element comprises a spring element configured to engage a portion of the receiving part so that the pressure element can be held in a position that allows pivoting of the anchoring element when the head and the pressure element are in the receiving part; wherein the spring element is on an outer wall portion of one of the straight side walls, the spring element spaced apart from an inner wall portion of the one straight side wall by a slot; and wherein the slot is positioned in the one straight side wall.
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Specification