# US 11,992,244 B2 · Polyaxial 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 11,992,244 B2 - Document ID: US11992244B2 - Status: Granted - Kind: B2 - Application number: 17/748,966 - Filed: 2022-05-19 - Published: 2022-11-03 - Granted: 2024-05-28 - Earliest claimed: 2017-10-25 - Assignees: Biedermann Technologies GmbH & Co. KG - Applicants: Biedermann Technologies GmbH & Co. KG - Inventors: Timo Biedermann; Wilfried Matthis - Web page: https://patentgrep.com/patent/US11992244B2 ## CPC - A61B 17/7037: {wherein pivoting is blocked when the rod is clamped} - 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 17/7076: {for driving, positioning or assembling spinal clamps or bone anchors specially adapted for spinal fixation} - A61B 17/7086: {Rod reducers, i.e. devices providing a mechanical advantage to allow a user to force a rod into or onto an anchor head other than by means of a rod-to-bone anchor locking element; rod removers} - A61B 17/8605: {Heads, i.e. proximal ends projecting from bone} - A61B 2017/564: {Methods for bone or joint treatment} - A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D) ## Abstract A bone anchoring device includes a receiving part for coupling a rod to a bone anchoring element, the receiving part having a first end, a second end, a recess at the first end for receiving the rod, and a compressible head receiving portion at the second end for accommodating a head of the bone anchoring element, a pressure member positionable in the receiving part to exert pressure on the head, and a clamping ring positionable around the head receiving portion and movable towards the first end of the receiving part to a locking position where the clamping ring exerts force on and compresses the head receiving portion. In the locking position, at least part of the clamping ring that faces the first end of the receiving part is exposed to the outside to facilitate movement of the clamping ring away from the first end of the receiving part. ## Claims ### Claim 1 A bone anchoring device comprising: a bone anchoring element comprising a head and a shank for anchoring in a bone or a vertebra; a receiving part for coupling a rod to a bone anchoring element, the receiving part having a first end, a second end, a central axis extending through the first and second ends, a recess at the first end for receiving the rod, and a head receiving portion at the second end for accommodating the head of the bone anchoring element; a pressure member positionable in the receiving part and comprising an engagement surface configured to exert pressure on the head; and a ring configured to be assembled to and movable towards the first end of the receiving part to an uppermost position relative to the receiving part where the ring is configured to directly engage and compress a radially compressible portion of the bone anchoring device to clamp the head in the head receiving portion; wherein when the ring is assembled to and remains at a same axial position relative to the receiving part, the head is insertable through the second end of the receiving part into the head receiving portion and is restricted from being removed out of the head receiving portion through the second end; and wherein when the head is clamped in the head receiving portion, at least part of the head receiving portion is configured to extend axially below a greatest diameter of the head measured in a direction perpendicular to the central axis. ### Claim 2 (depends on 1) The bone anchoring device of claim 1, wherein the radially compressible portion is formed on the head receiving portion of the receiving part. ### Claim 3 (depends on 1) The bone anchoring device of claim 1, wherein the ring is positionable around the head receiving portion of the receiving part. ### Claim 4 (depends on 3) The bone anchoring device of claim 3, wherein when the ring is at the uppermost position, the ring exerts a force on the head receiving portion to radially compress the head receiving portion. ### Claim 5 (depends on 1) The bone anchoring device of claim 1, wherein the radially compressible portion is fixed axially relative to the first end of the receiving part. ### Claim 6 (depends on 1) The bone anchoring device of claim 1, wherein when the ring is at the uppermost position, the bone anchoring device is configured to assume a locking position where an angular position of the bone anchoring element is locked relative to the receiving part. ### Claim 7 (depends on 1) The bone anchoring device of claim 1, wherein when the head is in the head receiving portion and the locking ring is at the uppermost position, the head is prevented from being removed out of the head receiving portion through the second end. ### Claim 8 (depends on 1) The bone anchoring device of claim 1, wherein when the head is in the head receiving portion and the ring is at the uppermost position, the head is configured to be clamped in the head receiving portion while the recess for the rod remains sufficiently unobstructed for the rod to extend and move therethrough. ### Claim 9 (depends on 1) The bone anchoring device of claim 1, wherein the ring is movable downward from the uppermost position relative to the receiving part to reduce the clamping force on the head. ### Claim 10 (depends on 1) The bone anchoring device of claim 1, wherein the head is held in a seat, and the radially compressible portion is configured to be spaced apart from the seat. ### Claim 11 (depends on 10) The bone anchoring device of claim 10, wherein the seat for the head is formed on the pressure member. ### Claim 12 (depends on 11) The bone anchoring device of claim 11, wherein the ring is configured to compress the radially compressible portion, which in turn is configured to compress the pressure member to clamp the head. ### Claim 13 A bone anchoring device comprising: a receiving part for coupling a rod to a bone anchoring element, the receiving part having a first end, a second end, a central axis extending through the first and second ends, a recess at the first end for receiving the rod, and a head receiving portion at the second end for accommodating a head of the bone anchoring element; a pressure member positionable in the receiving part and comprising an engagement surface configured to exert pressure on the head of the bone anchoring element; a ring configured to be assembled to and movable towards the first end of the receiving part to an uppermost position relative to the receiving part where the ring is configured to compress a radially compressible portion of the bone anchoring device to clamp the head in the head receiving portion; and at least one additional member positionable radially between the ring and the central axis, wherein an uppermost portion of the at least one additional member is positionable axially above a lowermost portion of the receiving part, and wherein the at least one additional member comprises a surface configured to restrict axial movement of the pressure member relative to the receiving part. ### Claim 14 (depends on 13) The bone anchoring device of claim 13, wherein the radially compressible portion is formed on the head receiving portion of the receiving part. ### Claim 15 (depends on 13) The bone anchoring device of claim 13, wherein the ring is positionable around the head receiving portion of the receiving part. ### Claim 16 (depends on 13) The bone anchoring device of claim 13, wherein the at least one additional member comprises at least one pin that is engageable with the pressure member. ### Claim 17 (depends on 13) The bone anchoring device of claim 13, wherein the at least one additional member is configured to restrict axially upward movement of the pressure member relative to the receiving part. ### Claim 18 (depends on 13) The bone anchoring device of claim 13, wherein the uppermost portion of the at least one additional member is positionable axially above a lowermost portion of the pressure member. ### Claim 19 (depends on 13) The bone anchoring device of claim 13, wherein the at least one additional member is positionable entirely axially above the head of the bone anchoring element when the head is held in the head receiving portion. ### Claim 20 A bone anchoring device comprising: a bone anchoring element comprising a head and a shank for anchoring in a bone or a vertebra; a receiving part for coupling a rod to the bone anchoring element, the receiving part having a first end, a second end, a central axis extending through the first and second ends, a recess at the first end for receiving the rod, and a head receiving portion at the second end for accommodating the head of the bone anchoring element; a ring configured to be assembled to and movable towards the first end of the receiving part to an uppermost position relative to the receiving part where the ring is configured to compress a radially compressible portion of the bone anchoring device to clamp the head in the head receiving portion while the recess for the rod remains sufficiently unobstructed for the rod to extend and move therethrough; wherein when the ring is assembled to and remains at a same axial position relative to the receiving part, the head is insertable through the second end of the receiving part into the head receiving portion and is restricted from being removed out of the head receiving portion through the second end; and wherein when the head is clamped in the head receiving portion, at least part of the head receiving portion is configured to extend axially below a greatest diameter of the head measured in a direction perpendicular to the central axis. ### Claim 21 (depends on 20) The bone anchoring device of claim 20, wherein the radially compressible portion is formed on the head receiving portion of the receiving part. ### Claim 22 (depends on 20) The bone anchoring device of claim 20, wherein the ring is positionable around the head receiving portion of the receiving part. ### Claim 23 (depends on 20) The bone anchoring device of claim 20, wherein the radially compressible portion is configured to expand when the head is inserted through the second end of the receiving part into the head receiving portion. ### Claim 24 (depends on 20) The bone anchoring device of claim 20, further comprising a pressure member positionable in the receiving part and comprising an engagement surface configured to exert pressure on the head.