# US 7,608,081 B2 · Rod reducer > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 7,608,081 B2 - Document ID: US7608081B2 - Status: Granted - Kind: B2 - Application number: 11/206,458 - Filed: 2005-08-18 - Published: 2006-12-28 - Granted: 2009-10-27 - Earliest claimed: 2005-05-23 - Assignees: Custom Spine, Inc. - Inventors: Mahmoud F. Abdelgany - Web page: https://patentgrep.com/patent/US7608081B2 ## CPC - 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} - Y10S 606/914: Toolkit for installing or removing spinal positioner or stabilizer - A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D) - Y10S: TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS ## Abstract A cam coupling rod reducer and method of operation comprises an inner tube comprising a first end having a hole and a second end having a plurality of prongs extending therefrom. The rod reducer further includes a lever cam connected to the first end, wherein the lever cam comprises a base and a pair of semicircular arms extending from the base, wherein each of the arms comprise a hole configured to align with the hole of the first end of the inner tube. The rod reducer also includes an outer extension tube connected to the inner tube, wherein the outer extension tube comprises positional markings on the body of the outer extension tube; a top end having a concave opening; and a bottom end comprising an opening configured to permit the prongs of the inner tube to extend therethrough; and a pair of pegs extending from the bottom end. ## Claims ### Claim 1 A cam coupling rod reducer comprising: an inner tube comprising: an inner hollow area; a cylindrical body portion comprising a closed end and an open end positioned opposite to said closed end and along the same longitudinal axis as said closed end, wherein said closed end comprises a through hole extending an entire width of said body portion, and wherein said cylindrical body portion circumferentially surrounds an entirety of said inner hollow area in between said open end and said through hole; a plurality of prongs extending outwardly from said body portion and along the same longitudinal axis as said body portion, wherein said plurality of prongs extend from said body portion at a position where said open end of said body portion is located; an annular rib circumferentially disposed around an entirety of said body portion; a lever cam pivotally connected to a tip of said closed end of said inner tube, wherein said lever cam comprises: an elongated base that articulates said lever cam 180 degrees; and a pair of semicircular arms spaced apart and parallel to one another and extending from said base, wherein each of said arms comprise exactly one hole that aligns with said through hole of said closed end of said inner tube such that said pair of semicircular arms straddle an entire width of said body portion; a cylindrical outer extension tube positioned around said inner tube, wherein said outer extension tube comprises: a concave end that contacts said lever cam during articulation of said elongated base; and a length equal to at least three-quarters of the length of said inner tube, wherein said outer extension tube comprises a tip end positioned opposite to said concave end, and wherein said tip end of said outer extension tube comprises a clover-shaped hole that permits said plurality of prongs of said inner tube to extend therethrough. ### Claim 2 (depends on 1) The cam coupling rod reducer of claim 1, wherein said outer extension tube comprises positional markings on an outer surface of said outer extension tube. ### Claim 3 (depends on 1) The cam coupling rod reducer of claim 1, wherein said tip end of said outer extension tube comprises exactly two pegs extending outwardly from said tip end. ### Claim 4 (depends on 1) The cam coupling rod reducer of claim 1, wherein said tip end of said outer extension tube comprises: a pair of pegs extending from said tip end in a direction substantially similar to a direction of said prongs extending from said inner tube. ### Claim 5 (depends on 1) The cam coupling rod reducer of claim 1, wherein said outer extension tube comprises indent features defined in an outer body of said outer extension tube. ### Claim 6 (depends on 1) The cam coupling rod reducer of claim 1, wherein said outer extension tube comprises a slot. ### Claim 7 (depends on 6) The cam coupling rod reducer of claim 6, wherein said annular rib is visible through said slot when said inner tube is seated in said outer extension tube. ### Claim 8 (depends on 6) The cam coupling rod reducer of claim 6, wherein said annular rib is positioned in a substantially midway position of said body portion of said inner tube. ### Claim 9 A cam coupling rod reducer comprising: a one-piece inner tube comprising: an inner hollow area; a cylindrical body portion comprising a closed end and an open end positioned opposite to said closed end and along the same longitudinal axis as said closed end, wherein said closed end comprises a through hole extending an entire width of said body portion, and wherein” said cylindrical body portion circumferentially surrounds an entirety of said inner hollow area in between said open end and said through hole; a plurality of prongs extending outwardly from said body portion and along the same longitudinal axis as said body portion, wherein said plurality of prongs extend from said body portion at a position where said open end of said body portion is located; an annular rib circumferentially disposed around an entirety of said body portion, wherein said annular rib is positioned in a substantially midway position of said body portion of said inner tube; a one-piece lever cam pivotally connected to a tip of said closed end of said inner tube, wherein said lever cam is completely external to said inner tube and comprises: an elongated base that articulates said lever cam 180 degrees; and a pair of semicircular arms spaced apart and parallel to one another and extending from said base, wherein each of said arms comprise exactly one hole that aligns with said through hole of said closed end of said inner tube such that said pair of semicircular arms straddle an entire width of said body portion; a one-piece cylindrical outer extension tube positioned around said inner tube, wherein said outer extension tube comprises: a concave end that contacts said lever cam during articulation of said elongated base; a length equal to at least three-quarters of the length of said inner tube; and a slot positioned in a substantially midway position of said outer extension tube, wherein said outer extension tube comprises a tip end positioned opposite to said concave end, and wherein said tip end of said outer extension tube comprises a clover-shaped hole that permits said plurality of prongs of said inner tube to extend therethrough. ### Claim 10 (depends on 9) The cam coupling rod reducer of claim 9, wherein said outer extension tube comprises positional markings on an outer surface of said outer extension tube. ### Claim 11 (depends on 9) The cam coupling rod reducer of claim 9, wherein said tip end of said outer extension tube comprises exactly two pegs extending outwardly from said tip end. ### Claim 12 (depends on 9) The cam coupling rod reducer of claim 9, wherein said tip end of said outer extension tube comprises: a pair of pegs extending from said tip end in a direction substantially similar to a direction of said prongs extending from said inner tube. ### Claim 13 (depends on 9) The cam coupling rod reducer of claim 9, wherein said outer extension tube comprises indent features defined in an outer body of said outer extension tube. ### Claim 14 (depends on 9) The cam coupling rod reducer of claim 9, wherein said annular rib is visible through said slot when said inner tube is fully seated in said outer extension tube. ### Claim 15 A cam coupling rod reducer comprising: an inner tube comprising: a hollow inner region; a first end having a hole; an open second end having a plurality of prongs extending therefrom; a body portion that completely wraps around said hollow inner region in an area between said hole and said open second end; and a rib circumferentially disposed around an entire portion of a body of said inner tube; a lever cam connected to said first end of said inner tube, wherein said lever cam comprises: a base; and a pair of semicircular arms spaced apart and parallel to one another and extending from said base, wherein each of said arms comprise a hole that aligns with said hole of said first end of said inner tube; and an outer extension tube connected to said inner tube, wherein said outer extension tube comprises: a slot; positional markings on a body of said outer extension tube and positioned adjacent to said slot; indent features defined in said body of said outer extension tube; a top end having a concave opening; and a bottom end opposite said top end, said bottom end comprising: a clover-shaped opening that permits said prongs of said inner tube to extend therethrough; and a pair of pegs extending from said bottom end in a direction substantially similar to a direction of said prongs extending from said second end of said inner tube. ### Claim 16 (depends on 15) The cam coupling rod reducer of claim 15, wherein said rib is visible through said slot when said inner tube is seated in said outer extension tube. ### Claim 17 (depends on 15) The cam coupling rod reducer of claim 15, wherein said outer extension tube comprises a length equal to at least three-quarters of the length of said inner tube. ### Claim 18 (depends on 15) The cam coupling rod reducer of claim 15, wherein said slot is positioned in a substantially midway position of said outer extension tube. ### Claim 19 (depends on 15) The cam coupling rod reducer of claim 15, wherein said rib is positioned in a substantially midway position of said body portion of said inner tube. ### Claim 20 (depends on 15) The cam coupling rod reducer of claim 15, wherein said lever cam is pivotally connected to said first end of said inner tube.