# US 11,298,157 B2 · Closure assembly for securing a stabilization element in a receiving part of a bone anchoring device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,298,157 B2 - Document ID: US11298157B2 - Status: Granted - Kind: B2 - Application number: 16/856,839 - Filed: 2020-04-23 - Published: 2020-10-29 - Granted: 2022-04-12 - Earliest claimed: 2019-04-26 - Assignees: Biedermann Technologies GmbH & Co. KG - Applicants: Biedermann Technologies GmbH & Co. KG - Inventors: Timo Biedermann; Berthold Dannecker - Web page: https://patentgrep.com/patent/US11298157B2 ## CPC - A61B 17/7037: {wherein pivoting is blocked when the rod is clamped} - A61B 17/683: {comprising bone transfixation elements, e.g. bolt with a distal cooperating element such as a nut} - A61B 17/7032: {Screws or hooks with U-shaped head or back through which longitudinal rods pass} - A61B 17/7035: {Screws or hooks, wherein a rod-clamping part and a bone-anchoring part can pivot relative to each other} - A61B 17/8605: {Heads, i.e. proximal ends projecting from bone} - A61B 17/863: {with thread interrupted or changing its form along shank, other than constant taper} - A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D) ## Abstract A closure assembly for securing an elongate stabilization element in a receiving part of a bone anchoring device includes a first closure member and a second closure member. The first closure member is receivable between legs of the receiving part, has an axis of rotation, and includes an outer surface with an engagement portion configured to engage the legs of the receiving part, and an inner surface having at least a portion that is threaded and that defines a central passage that passes axially through the first closure member. The second closure member has an axis of rotation and an outer surface having a threaded portion configured to cooperate with the threaded portion of the inner surface of the first closure member. The threaded portion of the outer surface of the second closure member includes a multi-start thread with at least two starts. ## Claims ### Claim 1 A closure assembly for securing an elongate stabilization element in a receiving part of a bone anchoring device, the closure assembly comprising: a first closure member receivable between legs of the receiving part, the first closure member having an axis of rotation and comprising an outer surface with a first threaded portion comprising a single-start thread formed on at least a portion thereof that is configured to engage the legs of the receiving part, and an inner surface having at least a portion that is threaded, the inner surface defining a central passage that passes axially through the first closure member; and a second closure member having an axis of rotation and an outer surface with a second threaded portion comprising a multi-start thread with at least two starts that are configured to cooperate with the threaded portion of the inner surface of the first closure member. ### Claim 2 (depends on 1) The closure assembly of claim 1, wherein the portion that is threaded on the inner surface of the first closure member comprises a multi-start thread with at least two starts. ### Claim 3 (depends on 1) The closure assembly of claim 1, wherein the second threaded portion of the outer surface of the second closure member comprises a flat thread. ### Claim 4 (depends on 1) The closure assembly of claim 1, wherein the portion that is threaded on the inner surface of the first closure member comprises a flat thread. ### Claim 5 (depends on 1) The closure assembly of claim 1, wherein the second closure member defines an axial passage that extends at least partially through the second closure member and an engagement portion for engagement with a driver. ### Claim 6 (depends on 5) The closure assembly of claim 5, wherein the axial passage extends axially entirely through the second closure member. ### Claim 7 (depends on 1) A bone anchoring device comprising: the closure assembly of claim 1; and the receiving part comprising two legs defining a U-shaped recess therebetween for receiving the elongate stabilization element. ### Claim 8 (depends on 7) The bone anchoring device of claim 7, wherein the first threaded portion of the outer surface of the first closure member is configured to cooperate with an internal thread formed on the legs of the receiving part. ### Claim 9 (depends on 8) The bone anchoring device of claim 8, wherein the internal thread formed on the legs of the receiving part comprises a single-start thread. ### Claim 10 (depends on 8) The bone anchoring device of claim 8, wherein the first threaded portion comprises a flat thread. ### Claim 11 (depends on 8) The bone anchoring device of claim 8, wherein the internal thread formed on the legs of the receiving part comprises a flat thread, a negative angle thread, a helical flange thread, a trapezoidal thread, or a buttress thread. ### Claim 12 (depends on 7) The bone anchoring device of claim 7, wherein the first closure member has a first end and a second end, and wherein an engagement structure is provided at the first end for engagement with a driver for advancing the first closure member between the legs of the receiving part. ### Claim 13 (depends on 12) The bone anchoring device of claim 12, wherein the engagement structure comprises a plurality of recesses that are open to the first end. ### Claim 14 (depends on 13) The bone anchoring device of claim 13, wherein the recesses of the engagement structure are closed in a radial direction towards the inner surface of the first closure member. ### Claim 15 (depends on 13) The bone anchoring device of claim 13, wherein the recesses of the engagement structure are open in a radial direction towards the outer surface of the first closure member. ### Claim 16 (depends on 7) The bone anchoring device of claim 7, further comprising a shank for anchoring in bone, wherein the shank is pivotably connectable to the receiving part, and wherein the first closure member is configured to lock an angular position of the receiving part relative to the shank and the second closure member is configured to lock the elongate stabilization element in the recess. ### Claim 17 (depends on 16) The bone anchoring device of claim 16, further comprising a pressure element configured to exert pressure onto an inserted head that forms an end portion of the shank, wherein the pressure element comprises a support surface for the elongate stabilization element. ### Claim 18 (depends on 17) The bone anchoring device of claim 17, wherein the support surface for the elongate stabilization element has a substantially V-shaped contour when viewed along a direction perpendicular to the central axis, and wherein sidewalls on either side of the support surface are configured to extend above the elongate stabilization element when the elongate stabilization element is supported on the support surface. ### Claim 19 A closure assembly for securing an elongate stabilization element in a receiving part of a bone anchoring device, the closure assembly comprising: a first closure member receivable between legs of the receiving part, the first closure member having an axis of rotation and comprising an outer surface with an engagement portion configured to engage the legs of the receiving part, and an inner surface having at least a portion that is threaded, the inner surface defining a central passage that passes axially through the first closure member; and a second closure member having a first end and an opposite second end, an axis of rotation, and an outer surface with a threaded portion configured to cooperate with the portion that is threaded on the inner surface of the first closure member, wherein the threaded portion of the second closure member comprises a multi-start thread with at least two starts and ends at a distance from the second end, and wherein a radially extending projection is provided at the second end and is configured to abut against a thread turn of the portion that is threaded on the inner surface of the first closure member. ### Claim 20 A method of coupling an elongate stabilization element to a bone or vertebra using a bone anchoring device comprising a shank for anchoring in the bone or vertebra, a receiving part pivotably connectable to the shank, the receiving part comprising two legs defining a U-shaped recess therebetween for receiving the elongate stabilization element, and a closure assembly for securing the elongate stabilization element in the receiving part, the closure assembly comprising a first closure member receivable between the legs of the receiving part, the first closure member having an axis of rotation and comprising an outer surface with a first threaded portion comprising a single-start thread formed on at least a portion thereof that is configured to engage the legs of the receiving part, and an inner surface having at least a portion that is threaded, the inner surface defining a central passage that passes axially through the first closure member, and a second closure member having an axis of rotation and an outer surface with a second threaded portion comprising a multi-start thread with at least two starts that are configured to cooperate with the threaded portion of the inner surface of the first closure member, the method comprising: anchoring the shank to the bone or vertebra; adjusting an angular position of the receiving part relative to the shank; inserting the elongate stabilization element into the U-shaped recess of the receiving part; inserting the closure assembly into the receiving part; advancing the first closure member into the receiving part to lock the angular position of the receiving part relative to the shank; and advancing the second closure member into the receiving part to lock the elongate stabilization element in the U-shaped recess of the receiving part.