# US 11,304,728 B2 · Integrated multipoint fixation screw > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,304,728 B2 - Document ID: US11304728B2 - Status: Granted - Kind: B2 - Application number: 17/174,456 - Filed: 2021-02-12 - Published: 2021-08-19 - Granted: 2022-04-19 - Earliest claimed: 2020-02-14 - Assignees: Medos International Sarl - Applicants: Medos International Sarl - Inventors: Kevin Lee; Joseph Peterson - Web page: https://patentgrep.com/patent/US11304728B2 ## CPC - A61B 17/70: Spinal positioners or stabilisers, e.g. stabilisers comprising fluid filler in an implant - 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 17/7044: {also having plates, staples or washers bearing on the vertebrae} - A61B 17/8057: {the interlocking form comprising a thread} - A61B 17/8605: {Heads, i.e. proximal ends projecting from bone} - A61B 17/8625: {Shanks, i.e. parts contacting bone tissue} - A61B 17/8685: {comprising multiple separate parts} - A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D) ## Abstract Bone anchor assemblies and related methods are disclosed herein that can provide for improved fixation of a primary bone anchor. A bone anchor assembly can include a base rotatably received within a rod-receiving member. The base can have a toroid body with a radially-extending portion including at least one auxiliary bone anchor opening that can receive an auxiliary bone anchor to augment fixation of a primary bone anchor of the bone anchor assembly. The base can be rotated relative to the rod-receiving member and the primary bone anchor such that the at least one auxiliary bone anchor opening can be placed in a desired position for supplemental fixation. ## Claims ### Claim 1 A bone anchor assembly, comprising: a base having a toroid body portion and a radially-extending portion including at least one auxiliary bone anchor opening configured to receive an auxiliary bone anchor, the base comprising an extension extending proximally from the toroid body portion; a receiver member having a proximal end, a distal end, with a lumen extending therebetween, and a rod-receiving recess; and a shank having a head portion retained within the toroid body portion and a bone engaging portion that extends distally from the base; wherein the base is coupled to the receiver member such that the base is configured to rotate relative to the receiver member, and wherein the extension is received within the lumen of the receiver member. ### Claim 2 (depends on 1) The bone anchor of claim 1, wherein the toroid body portion of the base extends distally from the receiver member. ### Claim 3 (depends on 1) The bone anchor of claim 1, wherein the extension of the base has a first connection feature and the receiver member has a second connection feature, wherein the first connection feature is configured to engage the second connection feature such that the base is rotatably received within the receiver member. ### Claim 4 (depends on 3) The bone anchor of claim 3, wherein the first connection feature and the second connection feature are configured such that relative axial movement between the base and the receiver member is restricted when the first connection feature engages with the second connection feature. ### Claim 5 (depends on 3) The bone anchor of claim 3, wherein the first connection feature is a lip at a proximal end of the extension and the second connection feature is a groove in an inner surface of the receiver member. ### Claim 6 (depends on 5) The bone anchor of claim 5, wherein the groove of the receiver member is distal to the rod-receiving recess. ### Claim 7 (depends on 3) The bone anchor of claim 3, wherein the first connection feature comprises a substantially continuous sidewall that is configured to engage the second connection feature. ### Claim 8 (depends on 1) The bone anchor of claim 1, further comprising a saddle disposed within the receiver member, the saddle having a distal-facing surface configured to contact a proximal-facing surface of the extension disposed within the receiver member. ### Claim 9 A surgical method, comprising: driving a shank of a bone anchor into a bone of a patient; rotating a base of the bone anchor relative to a receiver member of the bone anchor, the base having a radially-extending portion with at least one auxiliary bone anchor opening extending therethrough and an extension extending proximally therefrom, the receiver member configured to receive a spinal fixation element; disposing the extension within the receiver member; positioning the radially-extending portion of the base at a desired position relative to the shank; and driving at least one auxiliary bone anchor through the at least one auxiliary bone anchor opening in the radially-extending portion and into bone of the patient. ### Claim 10 (depends on 9) The method of claim 9, wherein rotating the base of the bone anchor further comprises rotating the base about a central longitudinal axis of the receiver member. ### Claim 11 (depends on 9) The method of claim 9, further comprising placing a spinal rod within the receiver member and securing the spinal rod within the receiver member before driving the at least one auxiliary bone anchor into bone. ### Claim 12 (depends on 9) The method of claim 9, further comprising placing a spinal rod within the receiver member and securing the spinal rod within the receiver member after driving the at least one auxiliary bone anchor into bone. ### Claim 13 (depends on 9) The method of claim 9, further comprising assembling the bone anchor by: coupling the base to the receiver member such that the base is rotatable about a central longitudinal axis of the receiver member; and inserting the shank through the receiver member and the base such that a distal bone-engaging portion of the shank extends distally from the base and a head portion of the shank is received within the base. ### Claim 14 (depends on 13) The method of claim 13, wherein the shank is rotatable polyaxially relative to the base. ### Claim 15 (depends on 9) The method of claim 9, wherein the base is rotated relative to the receiver member and the shank without translating relative to the shank.