# US 8,784,455 B2 · 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 8,784,455 B2 - Document ID: US8784455B2 - Status: Granted - Kind: B2 - Application number: 13/708,410 - Filed: 2012-12-07 - Published: 2013-07-04 - Granted: 2014-07-22 - Earliest claimed: 2006-12-22 - Assignees: Biedermann Technologies GmbH & Co. KG - Applicants: Biedermann Technologies GmbH & Co. KG - Inventors: Wilfried Matthis; Lutz Biedermann; Jurgen Harms - Web page: https://patentgrep.com/patent/US8784455B2 ## CPC - 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 17/7037: {wherein pivoting is blocked when the rod is clamped} - A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D) ## Abstract A bone anchoring device includes an anchoring element having a shank to be anchored in a bone or a vertebra, a receiving part connected to the shank the receiving part having a first end opposite to the shank and a second end facing the shank, a longitudinal axis passing through the two ends, a bore coaxial with the longitudinal axis extending from the first end through at least a portion of the receiving part and a substantially U-shaped recess for receiving a rod The U-shaped recess forms two free legs extending in the direction of the first end, the legs are provided with an internal thread. A locking device for securing the rod in the receiving part is provided which includes an external thread cooperating with the internal thread. An engagement structure is provided at the circumference of least a part of the outer surface projecting above the first end of the receiving part, the structure being engageable with a tool in a form-fit manner and wherein a maximum outer diameter of said first locking member in the region of said structure is larger than the inner diameter of the internal thread of the receiving part. ## Claims ### Claim 1 A bone anchoring device comprising: an anchoring element comprising a shank to be anchored in a bone or a vertebra; a receiving part connectable to the shank, the receiving part comprising: a first end opposite to the shank and a second end facing the shank, when connected to the shank; a longitudinal axis passing through the two ends; an outer surface at the first end, a side surface extending between the two ends, and an edge region between and inclined relative to the outer surface and the side surface; a bore coaxial with the longitudinal axis extending from the first end through at least a portion of the receiving part; and a substantially U-shaped recess for receiving a rod, the recess forming two free legs extending in the direction of the first end, the legs being provided with an internal thread and each including respective portions of the outer surface, the side surface, and the edge region; and a locking device for securing the rod in the receiving part, said locking device comprising; a first locking member having a first end and a second end, the first locking member being provided with an external thread on at least a portion thereof which cooperates with the internal thread provided on said legs to connect the first locking member to the receiving part, a coaxial bore passing entirely through the first locking member and an internal thread provided in at least a portion of said bore; a second locking member, the second locking member having an outer surface with an external thread in at least a portion thereof which cooperates with the internal thread provided at said bore of the first locking member; and a non-cylindrical engagement structure provided at a perimeter of at least a part of an outer surface of the first locking member projecting above the first end of the receiving part when connected to the receiving part, the structure being engageable with a tool in a form-fit manner, and wherein said engagement structure is larger than the inner diameter of the internal thread of the receiving part and is equal to or smaller than an inner dimension of the edge region of the receiving part. ### Claim 2 (depends on 1) The bone anchoring device of claim 1, wherein said anchoring element comprises a head and wherein said receiving part comprises a region adjacent to said second end for pivotably receiving said head. ### Claim 3 (depends on 2) The bone anchoring device of claim 2, further comprising a pressure element arranged in the receiving part between the head and the locking device for exerting pressure onto said head to lock the head in the receiving part. ### Claim 4 (depends on 3) The bone anchoring device of claim 3, wherein said pressure element has a substantially U-shaped recess for receiving at least a part of the rod, the depth of the recess being larger than the diameter of the rod. ### Claim 5 (depends on 1) The bone anchoring device of claim 1, wherein said first locking member is designed so as to lock the head without fixing the rod and wherein said second locking member is designed so as to fix rod. ### Claim 6 (depends on 1) The bone anchoring device of claim 1, wherein the outer contour of said engagement structure is a polygon or a star. ### Claim 7 (depends on 1) The bone anchoring device of claim 1, wherein the outer diameter of said engagement structure is larger than the outer diameter of the external thread of the locking device. ### Claim 8 A modular bone anchoring system comprising: an anchoring element comprising a shank to be anchored in a bone or a vertebra; a receiving part connectable to the shank the receiving part comprising a first end opposite to the shank and a second end facing the shank when connected to the shank, a longitudinal axis passing through the two ends, an outer surface at the first end, a side surface extending between the two ends, an edge region between and inclined relative to the outer surface and the side surface, a bore coaxial with the longitudinal axis extending from the first end through at least a portion of the receiving part, and a substantially U-shaped recess for receiving a rod, the recess forming two free legs extending in the direction of the first end, the legs being provided with an internal thread and each includinci resoecti veportions of the outer surface, the side surface, and the edge region; a pressure element arrangeable in the receiving part between the head and the locking device for exerting pressure onto said head to lock the head in the receiving part, wherein said pressure element has a substantially U-shaped recess for receiving at least a part of the rod, the depth of the recess being, larger than the diameter of the rod; a two-part locking device for securing the rod in the receiving part, said two-part locking device comprising an engagement structure provided at a perimeter of at least a part of an outer surface of the two-part locking device and configured to project above the first end of the receiving part when connected to the receiving part, the structure being engageable with a tool in a form-fit manner, and wherein said engagement structure is larger than the inner diameter of the internal thread of the receiving part and is smaller than an inner dimension of the edge region of the receiving part; and a single-part locking device for securing the rod in the receiving part, said single-part locking device comprising an engagement structure provided at a perimeter of at least a part of an outer surface of the single-part locking device and configured to project above the first end of the receiving part when connected to the receiving part, wherein said engagement structure is larger than the inner diameter of the internal thread of the receiving part and is equal to or smaller than an inner dimension of the edge region of the receiving part. ### Claim 9 (depends on 8) The modular system of claim 8, wherein the two-part locking device and the single-part locking device can be used interchangeably. ### Claim 10 (depends on 8) The modular bone anchoring device of claim 8, wherein the outer contour of said engagement structure of at least one of the two-part locking device and the single-part locking device is a polygon or a star. ### Claim 11 (depends on 8) The modular bone anchoring device of claim 8, wherein the outer diameter of said engagement structure of the two-part locking device and the single-part locking device is larger than the outer diameter of the external thread of the locking device. ### Claim 12 A method of attaching a bone anchoring device to a bone, the bone anchoring device comprising an anchoring element having a shank to be anchored in a bone or a vertebra, a receiving part connectable to the shank, the receiving part comprising a first end opposite to the shank and a second end facing the shank when connected to the shank, a longitudinal axis passing through the two ends, an outer surface at the first end, a side surface extending between the two ends, an edge region between and inclined relative to the outer surface and the side surface, a bore coaxial with the longitudinal axis extending from the first end through at least a portion of the receiving part, and a substantially U-shaped recess for receiving a rod, the recess forming two free legs extending in the direction of the first end, the legs being provided with an internal thread and each including respective portions of the outer surface, the side surface, and the edge region, the bone anchoring device further comprising a locking device for securing the rod in the receiving part, said locking device comprising a first locking member having a first end and a second end, the first locking member being provided with an external thread on at least a portion thereof which cooperates with the internal thread provided on said legs to connect the first locking member to the receivingpart, a coaxial bore passing entirely through the first locking member, and an internal thread provided in at least a portion of said bore, a second locking member, the second locking member having an outer surface with an external thread in at least a portion thereof which cooperates with the internal thread provided at said bore of the first locking member, and an engagement structure provided at a perimeter of at least a part of an outer surface of the first locking member projecting above the first end of the receiving part when connected to the receiving part, the structure being engageable with a tool in a form-fit manner, and wherein said engagement structure is larger than the inner diameter of the internal thread of the receiving part and is equal to or smaller than an inner dimension of the receiving part, the method comprising: anchoring the shank into a bone; inserting a rod in the U-shaped recess of the receiving part; fixing the shank of the anchoring element relative to the receiving part, the fixing comprising screwing the first locking member to the internal threads of the free legs, and tightening the first locking member by the tool engaging the engagement structure provided at the perimeter of the at least a part of the outer surface of the first locking member; fixing the rod in the U-shaped recess of the receiving part by screwing the second locking member to the internal thread of the first locking member and tightening the second locking member over the rod. ### Claim 13 A bone anchoring device comprising: an anchoring element comprising a shank to be anchored in a bone or a vertebra; a receiving part connectable to the shank, the receiving part comprising: a first end opposite to the shank and a second end facing the shank, when connected to the shank; a longitudinal axis passing through the two ends: a bore coaxial with the longitudinal axis extending from the first end through at least a portion of the receiving part; and a substantially U-shaped recess for receiving a rod, the recess forming two free legs extending in the direction of the first end, the legs being provided with an internal thread; and a locking device for securing the rod in the receiving part, said locking device comprising: a first locking member having a first end and a second end, the first locking member being provided with an external thread on at least a portion thereof which cooperates with the internal thread provided on said legs to connect the first locking member to the receiving part, a coaxial bore passing entirely through the first locking member, and an internal thread provided in at least a portion of said bore; a second locking member, the second locking member having an outer surface with an external thread in at least a portion thereof which cooperates with the internal thread provided at said bore of the first locking member; and an engagement structure provided at a perimeter of at least a part of an outer surface of the first locking member projecting above the first end of the receiving part when connected to the receiving part, the structure being engageable with a tool, and wherein the engagement structure is larger than the inner diameter of the internal thread of the receiving part, wherein the first locking member has a recess adjacent to the first end, and the second locking member includes a shoulder, wherein the shoulder is larger than the outer diameter of the external thread of the second locking member, and wherein the shoulder is smaller than an inner perimeter of the recess of the first locking member, such that the shoulder can be accommodated in the recess.