# US 2019/0167311 A1 · Receiving part for receiving a rod for coupling the rod to a bone anchoring element and a 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 2019/0167311 A1 - Document ID: US20190167311A1 - Status: Published application - Kind: A1 - Application number: 16/237,431 - Filed: 2018-12-31 - Published: 2019-06-06 - Earliest claimed: 2009-02-20 - Assignees: Biedermann Technologies GmbH & Co. KG - Applicants: Biedermann Technologies GmbH & Co. KG - Inventors: Lutz Biedermann; Wilfried Matthis - Web page: https://patentgrep.com/patent/US20190167311A1 ## 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 2017/564: {Methods for bone or joint treatment} - 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, the receiving part including: a receiving part body having a channel for receiving a rod and defining an accommodation space for accommodating a head of a bone anchoring element, the accommodation space having an opening for inserting the head; and a pressure element at least partially in the accommodation space, the pressure element including a first portion having a recess to receive the rod, and a second portion having a flexible portion to clamp the head, wherein the pressure element is moveable along a longitudinal axis of the receiving part body from an inserting position to insert the head, to a pre-locking position to clamp the head in the receiving part by a pre-stress exerted by the pressure element, to a locking position to lock the head in the receiving part. ## Claims ### Claim 1 A bone anchoring device comprising: a bone anchoring element having a 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 having a channel at a first end for receiving the rod, and defining an accommodation space at a second end opposite the first end for accommodating the head of the bone anchoring element; and a monolithic pressure element positionable in the receiving part body, the pressure element comprising a first portion configured to extend into the channel to contact the rod, and a second portion having a compressible portion to accommodate and clamp the head, wherein a recess extends circumferentially around an outer surface of the second portion adjacent to the first portion, and wherein an outer diameter of at least part of the second portion increases as the second portion extends away from the first portion; wherein when the pressure element is in the receiving part body, the head of the bone anchoring element is insertable into the receiving part, and the pressure element is movable to a pre-locking position wherein the head is restricted from being removed from the receiving part while a first surface of the pressure element that faces upwards towards the first end of the receiving part body engages the receiving part body to restrict the pressure element from moving towards the first end of the receiving part body; and wherein the pressure element is movable from the pre-locking position away from the first end of the receiving part body to a locking position wherein a compressive force is exerted on the compressible portion to lock an angular position of the head of the bone anchoring element relative to the receiving part. ### Claim 2 (depends on 1) The bone anchoring device of claim 1, wherein compressible portion of the pressure element is also expandable for inserting the head of the bone anchoring element. ### Claim 3 (canceled) ### Claim 4 (depends on 1) The bone anchoring device of claim 1, wherein in the pre-locking position, the outer surface of the second portion of the pressure element engages an inner surface of the receiving part body. ### Claim 5 (depends on 1) The bone anchoring device of claim 1, wherein the pressure element is held in the pre-locking position by a spring force. ### Claim 6 (depends on 5) The bone anchoring device of claim 5, wherein the spring force is generated by a spring portion on one of the pressure element or the receiving part body which cooperates with an abutment on the other one of the receiving part body or the pressure element. ### Claim 7 (canceled) ### Claim 8 (depends on 1) The bone anchoring device of claim 1, wherein a portion of the receiving part body that defines the accommodation space is substantially cylindrical and has a narrowing portion that narrows towards an opening at the second end of the receiving part body. ### Claim 9 (depends on 8) The bone anchoring device of claim 8, wherein the pressure element comprises a narrowing portion on the outer surface that narrows in a direction away from the first portion of the pressure element and that is configured to cooperate with the narrowing portion of the receiving part body. ### Claim at position 10 10-16. (canceled) ### Claim 17 (depends on 1) The bone anchoring device of claim 1, wherein the compressible portion of the pressure element has a hollow section for accommodating the head of the bone anchoring element and an opening for inserting the head. ### Claim 18 (depends on 1) The bone anchoring device of claim 1, wherein an outer diameter of the compressible portion is smaller than an inner diameter of a portion of the receiving part body that defines at least part of the accommodation space. ### Claim 19 (canceled) ### Claim 20 (depends on 1) The bone anchoring device of claim 1, wherein the second portion of the pressure element has a smaller maximum outer diameter than a maximum outer diameter of the first portion of the pressure element. ### Claim 21 (depends on 1) The bone anchoring device of claim 1, wherein the channel is a U-shaped recess for receiving the rod. ### Claim 22 (depends on 1) The bone anchoring device of claim 1, wherein the pressure element is secured from removal from the receiving part body. ### Claim at position 17 23-28. (canceled) ### Claim 29 (depends on 1) The bone anchoring device of claim 1, further comprising: the rod; and a closure element for securing the rod in the receiving part. ### Claim 30 A bone anchoring device comprising: a bone anchoring element having a 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 having a channel at a first end for receiving the rod, and defining an accommodation space at a second end opposite the first end for accommodating the head of the bone anchoring element; a pressure element positionable in the receiving part body, the pressure element comprising a first portion configured to extend into the channel to contact the rod, and a second portion axially connected to the first portion and having a compressible portion, to accommodate and clamp the head; and a separate ring configured to radially expand and/or compress; wherein when the pressure element and the ring are in the receiving part body, the head of the bone anchoring element is insertable into the receiving part, and the pressure element is movable away from the first end of the receiving part body to a pre-locking position wherein the head is restricted from being removed from the receiving part, while the ring forms an abutment restricting movement of the pressure element back towards the first end of the receiving part body; and wherein the pressure element is movable from the pre-locking position further away from the first end of the receiving part body to a locking position wherein a compressive force is exerted on the compressible portion to lock an angular position of the head of the bone anchoring element relative to the receiving part. ### Claim 31 (depends on 30) The bone anchoring device of claim 30, wherein the ring is a snap ring. ### Claim 32 (depends on 1) The bone anchoring device of claim 1, wherein an end of the second portion of the pressure element adjacent the first portion of the pressure element has an outer diameter that is recessed with respect to an outer diameter of the first portion. ### Claim 33 (depends on 1) The bone anchoring device of claim 1, wherein a part of the first portion of the pressure element that is configured to extend into the channel to contact the rod includes a second surface that faces upwards towards the first end of the receiving part body, and wherein the second portion of the pressure element is spaced apart axially from the second surface. ### Claim 34 (depends on 1) The receiving part of claim 1, wherein at least part of the pressure element has a continuous exterior surface portion forming a ring. ### Claim 35 (depends on 1) The receiving part of claim 1, wherein the first surface of the pressure element is at a free end of the first portion of the pressure element. ### Claim 36 A method of coupling a rod to a bone via a bone anchoring device comprising a bone anchoring element having a shaft and a head, and a receiving part comprising a receiving part body having a channel at a first end for receiving the rod, and defining an accommodation space at a second end opposite the first end for accommodating the head of the bone anchoring element, a monolithic pressure element comprising a first portion configured to extend into the channel to contact the rod, and a second portion having a compressible portion to accommodate and clamp the head, wherein a recess extends circumferentially around an outer surface of the second portion adjacent to the first portion, and wherein an outer diameter of at least part of the second portion increases as the second portion extends away from the first portion, and a closure element, wherein when the pressure element is in the receiving part body, the head of the bone anchoring element is insertable into the receiving part, the method comprising: inserting the bone anchoring element into a bone; adjusting an angular position of the receiving part relative to the bone anchoring element when the head and the pressure element are in the receiving part body and when the pressure element has been moved to a pre-locking position wherein the head is restricted from being removed from the receiving part while a first surface of the pressure element that faces upwards towards the first end of the receiving part body engages the receiving part body to restrict the pressure element from moving towards the first end of the receiving part body; inserting the rod into the channel of the receiving part body; and advancing the closure element in the channel to push the rod against the pressure element to move the pressure element from the pre-locking position away from the first end of the receiving part body to a locking position wherein a compressive force is exerted on the compressible portion to lock the rod and the angular position of the head of the bone anchoring element relative to the receiving part.