# US 12,108,968 B2 · Pivotal bone anchor assembly with receiving member having a collet, pressure insert, and slidable outer sleeve > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,108,968 B2 - Document ID: US12108968B2 - Status: Granted - Kind: B2 - Application number: 17/068,530 - Filed: 2020-10-12 - Published: 2021-01-28 - Granted: 2024-10-08 - Earliest claimed: 2013-10-29 - Assignees: Roger P. Jackson - Applicants: Roger P. Jackson - Inventors: Roger P. Jackson; James L. Surber - Web page: https://patentgrep.com/patent/US12108968B2 ## 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 17/7076: {for driving, positioning or assembling spinal clamps or bone anchors specially adapted for spinal fixation} - A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D) ## Abstract A pivotal bone anchor assembly includes a shank having a shank head and an anchor portion, and a receiving member having an upper portion defining an open channel for receiving an elongate rod and a lower portion with a downwardly extending collet structure defining a lower portion of a central bore for receiving the shank head upon uploading through a lower collet opening. The assembly also includes a pressure insert positionable into the central bore prior to uploading the shank head, and an outer ring slidably engageable with an outer surface of the collet structure to inhibit the collet structure from expanding. After the shank head has been uploaded and captured within the central bore, the pressure insert is downwardly compressed against the shank head by the elongate rod so as to lock the position of the shank with respect to the receiving member. ## Claims ### Claim 1 A pivotal bone anchor assembly for securing an elongate rod to a head of a shank via a closure top, the pivotal bone anchor assembly comprising: a shank comprising a head and an anchor portion opposite the head configured for attachment to a bone of a patient; a receiving member comprising: a central bore centered about a vertical centerline axis; an upper portion including a pair of upright arms defining an open channel configured to receive the elongate rod and an upper portion of the central bore communicating with the open channel and configured to receive the closure top; and a lower portion including a downwardly extending collet structure having an inner surface defining a lower portion of the central bore communicating with a bottom surface of the receiving member through a collet opening, the collet structure configured to expandingly receive the head of the shank upon the head being uploaded through the collet opening; a pressure insert configured for positioning into the central bore prior to uploading the head of the shank into the collet structure, the pressure insert having an upward-facing surface configured to receive the elongate rod and an inner lower surface configured to engage the head of the shank; and an outer ring configured for positioning on the receiving member at least partially above the collet structure prior to uploading the head of the shank into the collet structure, the outer ring being downwardly slidably engageable with an outer surface of the collet structure so as to inhibit the collet structure from expanding, wherein after the head of the shank has been uploaded through the collet opening and captured within the lower portion of the central bore, the pressure insert is configured for downward compression against the head of the shank by force from the closure top so as to lock the position of the shank with respect to the receiving member, and wherein the upward-facing surface of the pressure insert is above a top surface of the outer ring when the pivotal bone anchor assembly is in a locked configuration. ### Claim 2 (depends on 1) The pivotal bone anchor assembly of claim 1, wherein the inner lower surface of the pressure insert further comprises a spherical contact surface configured to engage a spherical outer surface of the head of the shank with a friction fit engagement prior to locking the position of the shank with respect to the receiving member by force from the closure top. ### Claim 3 (depends on 2) The pivotal bone anchor assembly of claim 2, wherein the pressure insert is configured to be moved downward within the central bore of the receiving member to establish the friction fit engagement between the spherical contact surface of the pressure insert and the spherical outer surface of the head of the shank. ### Claim 4 (depends on 1) The pivotal bone anchor assembly of claim 1, wherein the upper portion and the lower portion of the receiving member are configured as separate parts. ### Claim 5 (depends on 4) The pivotal bone anchor assembly of claim 4, wherein the lower portion of the receiver member is snapped into a recess formed in the upper portion of the receiving member. ### Claim 6 (depends on 1) The pivotal bone anchor assembly of claim 1, further comprising at least one horizontal ridge protruding radially outward from an outer surface of each upright arm of the upper portion of the receiving member. ### Claim 7 (depends on 1) The pivotal bone anchor assembly of claim 1, wherein the collet structure of the lower portion of the receiving member further comprises a plurality of slots extending upwardly from the collet opening. ### Claim 8 (depends on 1) The pivotal bone anchor assembly of claim 1, wherein the pressure insert includes a center aperture configured for receiving a driving tool therethrough. ### Claim 9 (depends on 1) The pivotal bone anchor assembly of claim 1, wherein the pressure insert includes an outer cylindrical surface. ### Claim 10 (depends on 1) The pivotal bone anchor assembly of claim 1, wherein the outer ring is a closed ring. ### Claim 11 (depends on 1) The pivotal bone anchor assembly of claim 1 and further comprising the elongate rod and the closure top, wherein the closure top is configured for positioning entirely within the open channel of the receiving member above the elongate rod and in engagement with a mating structure formed into inner surfaces of the upright arms to apply a downward pressure to a top of the elongate rod, so as to secure the elongate rod to the bone of the patient. ### Claim 12 (depends on 11) The pivotal bone anchor assembly of claim 11, wherein an annular top surface of the outer ring is spaced below the elongate rod when the receiver assembly is in a locked configuration. ### Claim 13 A receiver assembly for securing an elongate rod to a head of a shank via a closure top, the shank having an anchor portion opposite the head configured for attachment to a bone of a patient, the receiver assembly comprising: a receiving member comprising: a central bore centered about a vertical centerline axis; an upper portion including a pair of upright arms defining an open channel configured to receive the elongate rod, an upper portion of the central bore communicating with the open channel and configured to receive the closure top, and at least one horizontal ridge protruding radially outward from an outer surface of each upright arm; and a lower portion including a downwardly extending collet structure having an inner surface defining a lower portion of the central bore communicating with a bottom surface of the receiving member through a collet opening, the collet structure configured to receive the head of the shank upon the head being uploaded through the collet opening; a pressure insert configured for positioning into the central bore prior to uploading the head of the shank into the collet structure, the pressure insert having an upward-facing surface configured to receive the elongate rod and an inner lower surface configured to engage the head of the shank; and an outer ring configured for positioning on the receiving member at least partially above the collet structure, the outer ring being downwardly slidably engageable with an outer surface of the collet structure so as to inhibit the collet structure from expanding, wherein the upward-facing surface of the pressure insert is above a top surface of the outer ring when the receiver assembly is in a locked configuration with the head of the shank. ### Claim 14 (depends on 13) The receiver assembly of claim 13, wherein the upper portion and the lower portion of the receiving member are configured as separate parts. ### Claim 15 (depends on 14) The receiver assembly of claim 14, wherein the lower portion of the receiver member is snapped into a recess formed in the upper portion of the receiving member. ### Claim 16 (depends on 13) The receiver assembly of claim 13, wherein the collet structure of the lower portion of the receiving member further comprises a plurality of slots extending upwardly from the collet opening. ### Claim 17 (depends on 13) The receiver assembly of claim 13, wherein the pressure insert includes a center aperture configured for receiving a driving tool therethrough. ### Claim 18 (depends on 13) The receiver assembly of claim 13, wherein the outer ring is a closed ring.