# US 2010/0168801 A1 · Receiving part for receiving a rod for coupling the rod to a bone anchoring element and bone anchoring device with such a receiving part > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2010/0168801 A1 - Document ID: US20100168801A1 - Status: Published application - Kind: A1 - Application number: 12/649,236 - Filed: 2009-12-29 - Published: 2010-07-01 - Earliest claimed: 2008-12-29 - Assignees: Biedermann Technologies GmbH & Co. KG - Inventors: Lutz Biedermann; Wilfried Matthis; Berthold Dannecker - Web page: https://patentgrep.com/patent/US20100168801A1 ## CPC - A61B 17/7032: {Screws or hooks with U-shaped head or back through which longitudinal rods pass} - A61B 17/7037: {wherein pivoting is blocked when the rod is clamped} - A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D) ## Abstract A receiving part for receiving a rod for coupling the rod to a bone anchoring element includes a receiving part body including: a rod receiving portion with a channel for receiving a rod, and a head receiving portion for accommodating a head of a bone anchoring element, the head receiving portion having an open end and being flexible for inserting and clamping of the head, and an exterior surface with a curved portion; and a locking ring around the head receiving portion, wherein the locking ring has an interior surface with a curved portion for engagement with the curved portion of the exterior surface of the head receiving portion for locking a position of the head relative to the head receiving portion. ## Claims ### Claim 1 A receiving part for receiving a rod for coupling the rod to a bone anchoring element, the receiving part comprising: a receiving part body comprising: a rod receiving portion with a channel for receiving a rod, and a head receiving portion for accommodating a head of a bone anchoring element, the head receiving portion having an open end and being flexible for inserting and clamping of the head, and an exterior surface with a curved portion; and a locking ring around the head receiving portion, wherein the locking ring has an interior surface with a curved portion for engagement with the curved portion of the exterior surface of the head receiving portion for locking a position of the head relative to the head receiving portion. ### Claim 2 (depends on 1) The receiving part of claim 1, wherein the curved portion of the head receiving portion has a convex curvature. ### Claim 3 (depends on 1) The receiving part of claim 1, wherein the curved portion of the locking ring has a concave curvature. ### Claim 4 (depends on 1) The receiving part of claim 1, wherein the curved portion of the head receiving portion is a first curved portion, and the head receiving portion further comprises a second curved portion adjacent to the first curved portion and a groove between the first and second curved portions. ### Claim 5 (depends on 4) The receiving part of claim 4, wherein the first and second curved portions of the head receiving portion have a convex curvature, and the curved portion of the locking ring has a concave curvature. ### Claim 6 (depends on 4) The receiving part of claim 4, wherein an end of the curved portion of the locking ring forms an edge configured to cooperate with the groove of the head receiving portion. ### Claim 7 (depends on 1) The receiving part of claim 1, wherein the locking ring is movable between a first position in which the head receiving portion is not compressed for providing movement of the head and a second position in which the head is clamped in the head receiving portion to lock the position of the head relative to the head receiving portion. ### Claim 8 (depends on 7) The receiving part of claim 7, wherein the locking ring engages the head receiving portion in the second position in a form locking manner. ### Claim 9 (depends on 7) The receiving part of claim 7, wherein the locking ring is closer to the open end of the head receiving portion in the second position than in the first position. ### Claim 10 (depends on 7) The receiving part of claim 7, further comprising a third position between the first position and the second position in which the head is preliminarily locked in the head receiving portion. ### Claim 11 (depends on 1) The receiving part of claim 1, wherein the head has a curved outer surface portion, and wherein a radius of curvature of the curved portion of the locking ring is smaller than a radius of curvature of the curved outer surface portion of the head. ### Claim 12 (depends on 1) The receiving part of claim 1, wherein the locking ring is configured to move upon exerting a pressure onto the locking ring via the rod. ### Claim 13 (depends on 1) The receiving part of claim 1, wherein the rod receiving portion comprises a first end and a second end, and a recess extends from the first end in the direction of the second end to form the channel. ### Claim 14 (depends on 1) The receiving part of claim 1, wherein the rod receiving portion has a first end and a second end, and the head receiving portion is arranged at the side of the second end, and wherein an outer diameter of the head receiving portion adjacent to the second end is smaller than an outer diameter of the rod receiving portion at the second end. ### Claim 15 (depends on 1) The receiving part of claim 1, wherein the head receiving portion comprises a plurality of slits adjacent to the open end. ### Claim 16 (depends on 1) The receiving part of claim 1, wherein the rod receiving portion comprises a plurality of slits extending from the second end to a distance from the first end. ### Claim 17 (depends on 16) The receiving part of claim 16, wherein at least one of the plurality of slits extends continuously from the open end of the head receiving portion to a distance from the first end of the rod receiving portion. ### Claim 18 A bone anchoring device comprising: a bone anchoring element having a threaded shaft and a head; and a receiving part for receiving a rod for coupling the rod to the bone anchoring element, the receiving part comprising: a receiving part body comprising a rod receiving portion with a channel for receiving the rod, and a head receiving portion for accommodating the head of the bone anchoring element, the head receiving portion having an open end and being flexible for inserting and clamping of the head, and an exterior surface with a curved portion; and a locking ring around the head receiving portion, wherein the locking ring has an interior surface with a curved portion for engagement with the curved portion of the exterior surface of the head receiving portion for locking a position of the head relative to the head receiving portion. ### Claim 19 (depends on 18) The bone anchoring device according to claim 18, wherein a closure element is provided for securing the rod in the channel. ### Claim 20 A method of coupling a rod to a bone anchoring element via a receiving part, the receiving part comprising a rod receiving portion with a channel for receiving the rod, a head receiving portion having an open end and being flexible for inserting and clamping of a head of the bone anchoring element and an exterior surface with a curved portion, and a locking ring around the head receiving portion and having an interior surface with a curved portion for engagement with the curved portion of the exterior surface of the head receiving portion, the method comprising: introducing the head of the bone anchoring element into the open end of the head receiving portion; pivoting the head receiving portion relative to the head to align the receiving part with the rod; inserting the rod into the channel of the rod receiving portion; advancing a closure element in the channel to push the rod against the locking ring; and further advancing the closure element in the channel towards the head receiving portion to force the locking ring towards the open end of the head receiving portion via the rod and to lock a position of the rod relative to the receiving part, wherein advancement of the locking ring towards the open end of the head receiving portion engages the curved portion of the locking ring with the curved portion of the exterior surface of the head receiving portion to compress the head receiving portion and lock the position of the bone anchoring element relative to the receiving part. ### Claim 21 (depends on 20) The method of claim 20, further comprising inserting the bone anchoring element into a bone prior to the introduction of the head of the bone anchoring element into the open end of the head receiving portion. ### Claim 22 (depends on 20) The method of claim 20, further comprising inserting the bone anchoring element into a bone after the introduction of the head of the bone anchoring element into the open end of the head receiving portion. ### Claim 23 (depends on 20) The method of claim 20, wherein prior to the engagement of the curved portion of the locking ring and the curved portion of the exterior surface of the head receiving portion, the locking ring is advanced to a preliminary locking position where the position of the bone anchoring element relative to the receiving part is loosely held.