POLYAXIAL BONE ANCHORING DEVICE
First Claim
1. A polyaxial bone anchoring device comprising:
- an anchoring element having a shaft for anchoring in a bone and a head;
a receiving part having a first end and a second end, a channel for receiving a rod therein, a bore extending from the first end towards the second end, a seat for receiving the head, and at least one threaded through hole transverse to the bore;
a pressure element configured to be arranged in the bore and to exert pressure onto the head when the head and the pressure element are in the receiving part, such that 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 having at least one hole configured to at least partially align with the through hole of the receiving part; and
at least one set screw configured to be inserted into the through hole of the receiving part;
wherein when the head and the pressure element are in the receiving part, the set screw is threadable into the through hole to a first position where the set screw engages the pressure element at the hole such that a force is exerted by the pressure element onto the head that maintains the head at an adjustable angular position relative to the receiving part by friction prior to locking the head relative to the receiving part.
2 Assignments
0 Petitions
Accused Products
Abstract
A polyaxial bone anchoring device includes an anchoring element having a shaft and a head, a receiving part having a first end and a second end, a bore extending from the first end towards the second end, a seat for receiving the head, and at least one threaded through hole transverse to the bore, a pressure element to exert pressure onto the head, such that the head is pivotable and can be locked at an angle relative to the receiving part, the pressure element having at least one hole configured to at least partially align with the through hole, and at least one set screw threadable into the through hole to engage the pressure element at the hole such that a force is exerted by the pressure element onto the head that maintains the head at an adjustable angular position relative to the receiving part by friction.
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Citations
17 Claims
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1. A polyaxial bone anchoring device comprising:
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an anchoring element having a shaft for anchoring in a bone and a head; a receiving part having a first end and a second end, a channel for receiving a rod therein, a bore extending from the first end towards the second end, a seat for receiving the head, and at least one threaded through hole transverse to the bore; a pressure element configured to be arranged in the bore and to exert pressure onto the head when the head and the pressure element are in the receiving part, such that 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 having at least one hole configured to at least partially align with the through hole of the receiving part; and at least one set screw configured to be inserted into the through hole of the receiving part; wherein when the head and the pressure element are in the receiving part, the set screw is threadable into the through hole to a first position where the set screw engages the pressure element at the hole such that a force is exerted by the pressure element onto the head that maintains the head at an adjustable angular position relative to the receiving part by friction prior to locking the head relative to the receiving part. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method of coupling a rod to a bone or vertebra via a polyaxial bone anchoring device, the polyaxial bone anchoring device comprising an anchoring element having a shaft for anchoring in a bone and a head, a receiving part having a first end and a second end, a channel for receiving the rod therein, a bore extending from the first end towards the second end, a seat for receiving the head, and at least one threaded through hole transverse to the bore, a pressure element configured to be arranged in the bore and to exert pressure onto the head when the head and the pressure element are in the receiving part, such that 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 having at least one hole configured to at least partially align with the through hole of the receiving part, and at least one set screw configured to be inserted into the through hole of the receiving part, the method comprising:
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advancing the set screw in the through hole of the receiving part to a first position where the set screw engages an inserted pressure element at the hole, such that a force is exerted by the pressure element onto the head of a connected anchoring element that maintains the head at an adjustable angular position relative to the receiving part by friction; inserting the anchoring element into a bone or vertebra; adjusting the angular position of the receiving part relative to the anchoring element; inserting a rod into the channel of the receiving part and the channel of the pressure element; and locking the angular position of the receiving part relative to the anchoring element and a position of the rod relative to the receiving part. - View Dependent Claims (15, 16, 17)
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Specification