# US 2014/0155899 A1 · Surgical instrument > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0155899 A1 - Document ID: US20140155899A1 - Status: Published application - Kind: A1 - Application number: 14/096,660 - Filed: 2013-12-04 - Published: 2014-06-05 - Earliest claimed: 2012-12-05 - Assignees: Smith & Nephew, Inc. - Applicants: Smith & Nephew, Inc. - Inventors: Steven Mark Bowman; James J. Kennedy, III; Sean M. Frick; Glenn Kenneth Trainer; Jon B. Taylor; David J. Callaghan - Web page: https://patentgrep.com/patent/US20140155899A1 ## CPC - A61B 17/1675: {for the knee} - A61B 17/1617: {with mobile or detachable parts} - A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D) ## Abstract A cannulated retrograde reamer that is adjustable to create tunnels of multiple different diameters. The cannulated retrograde reamer substantially reduces the risk of tunnel malposition and/or misalignment, and can be adjusted to create a range of tunnel diameters, thereby allowing inventory levels to be reduced for a surgical case. ## Claims ### Claim 1 A retrograde reamer for use in surgical procedures, comprising: a first tubular shaft; at least one second shaft movably disposable within the first tubular shaft; and at least one cutting member movably coupled to one of the first tubular shaft and the second shaft, wherein, in response to relative movement of the first tubular shaft and the second shaft, the cutting member is adapted to be displaced from a collapsed position to at least one deployed position, thereby defining at least one cutting diameter. ### Claim 2 (depends on 1) The retrograde reamer of claim 1 wherein the cutting member is movably coupled to the first tubular shaft. ### Claim 3 (depends on 2) The retrograde reamer of claim 2 wherein the cutting member is disposed adjacent a distal end of the first tubular shaft, and wherein, in response to relative rotational movement of the first tubular shaft and the second shaft, an externally threaded portion at a distal end of the second shaft is operative to threadingly engage an internally threaded portion at the distal end of the first tubular shaft, thereby causing the distal end of the first tubular shaft to axially move in a proximal direction, and the cutting member to be displaced from the collapsed position to the deployed position. ### Claim 4 (depends on 2) The retrograde reamer of claim 2 wherein the cutting member includes one or more helical blades, and wherein, in response to relative rotational and axial movement of the first tubular shaft and the second shaft, the helical blades are operative to unwind from the second shaft, thereby displacing the helical blades from the collapsed position to the deployed position. ### Claim 5 (depends on 2) The retrograde reamer of claim 2 wherein the first tubular shaft has a sidewall, the sidewall including at least one opening therethrough, and wherein the retrograde reamer further comprises: a flex member operative to movably couple the cutting member to the sidewall of the first tubular shaft substantially opposite the opening in the sidewall; and a deployment member coupled to the cutting member, the deployment member being operative, in response to being pulled distally, to displace the cutting member in a radial fashion from the collapsed position to the deployed position, the cutting member passing at least partially through the opening in the sidewall of the first tubular shaft while being displaced to the deployed position. ### Claim 6 (depends on 1) The retrograde reamer of claim 1 wherein the cutting member is movably coupled to the second shaft. ### Claim 7 (depends on 6) The retrograde reamer of claim 6 wherein, in response to relative axial movement of the first tubular shaft and the second shaft, the cutting member is operative to be displaced from the collapsed position to the deployed position. ### Claim 8 (depends on 7) The retrograde reamer of claim 7 further comprising: at least one wedge member disposed within the first tubular shaft adjacent a distal end of the first tubular shaft; and at least one flex member adapted to movably couple the cutting member to the second shaft, and wherein, in response to relative axial movement of the first tubular shaft and the second shaft, the cutting member is operative to impinge against the wedge member, thereby causing the flex member to be displaced from a first position substantially parallel to a longitudinal axis of the second shaft to a second off-axis position, and the cutting member to be displaced from the collapsed position to the deployed position. ### Claim 9 (depends on 8) The retrograde reamer of claim 8 wherein the first tubular shaft has a sidewall with at least one opening formed therethrough, and wherein, in response to the displacement of the flex member, the cutting member is operative to be displaced in a radial fashion from the collapsed position to the deployed position, the cutting member passing at least partially through the opening in the sidewall of the first tubular shaft while being displaced to the deployed position. ### Claim 10 (depends on 6) The retrograde reamer of claim 6 wherein the cutting member is movably coupled at a distal end of the second shaft by a pivot pin. ### Claim 11 (depends on 10) The retrograde reamer of claim 10 wherein, in response to axial movement of the second shaft in a distal direction, the cutting member is operative to move distally and to rotate about the pivot pin, thereby displacing the cutting member from the collapsed position to the deployed position. ### Claim 12 (depends on 11) The retrograde reamer of claim 11 wherein the first tubular shaft has a sidewall with at least one slot formed therethrough, and wherein, in response to axial movement of the second shaft in a proximal direction, the cutting member is operative to move proximally, thereby causing the cutting member to be placed in the slot in the deployed position. ### Claim 13 (depends on 6) The retrograde reamer of claim 6 wherein the at least one second shaft includes a second tubular shaft, and an internal shaft disposed within the second tubular shaft. ### Claim 14 (depends on 13) The retrograde reamer of claim 13 wherein the first tubular shaft, the second tubular shaft, and the internal shaft each have a sidewall including at least one opening formed therethrough, and wherein, in response to relative axial movement of the second tubular shaft and the internal shaft, the cutting member is operative to be displaced from the collapsed position to the deployed position, the cutting member passing at least partially through respective sidewall openings of the first tubular shaft, the second tubular shaft, and the internal shaft while being displaced to the deployed position. ### Claim 15 (depends on 6) The retrograde reamer of claim 6 wherein the cutting member is adapted to correspond to a pivotable distal end of the second shaft. ### Claim 16 (depends on 15) The retrograde reamer of claim 15 wherein, in response to axial movement of the second shaft in a distal direction, the pivotable distal end of the second shaft is operative to rotate, at a pivotable joint, from the collapsed position to the deployed position. ### Claim 17 (depends on 16) The retrograde reamer of claim 16 wherein the first tubular shaft has a sidewall including at least one slot formed therethrough, and wherein, in response to axial movement of the second shaft in a proximal direction, the pivotable distal end of the second shaft is operative to move proximally, thereby causing the pivotable distal end to be placed in the slot in the deployed position. ### Claim 18 (depends on 6) The retrograde reamer of claim 6 wherein the cutting member has a first cutting member portion and a second cutting member portion, and a flex member interconnecting the first and second cutting member portions. ### Claim 19 (depends on 18) The retrograde reamer of claim 18 wherein the first tubular shaft has a sidewall including at least one opening formed therethrough, and wherein, in response to axial movement of the second shaft toward a distal end of the first tubular shaft, the flex member is operative to allow the first and second cutting member portions to be displaced from the collapsed position to the deployed position, the first and second cutting member portions passing at least partially through the sidewall opening of the first tubular shaft while being displaced to the deployed position. ### Claim 20 (depends on 6) The retrograde reamer of claim 6 wherein the cutting member is adapted, in the collapsed position, to be selectively engaged with and disengaged from the first tubular shaft, and wherein, in response to relative rotational movement of the first tubular shaft and the second shaft, the cutting member is operative to be disengaged from the first tubular shaft, and to be displaced from the collapsed position to the deployed position. ### Claim 21 A method of operating a retrograde reamer in a surgical procedure, comprising: providing a retrograde reamer, the retrograde reamer including a first tubular shaft, at least one second shaft movably disposable within the first tubular shaft, and at least one cutting member movably coupled to one of the first tubular shaft and the second shaft; performing relative movement of the first tubular shaft and the second shaft; and in response to the relative movement of the first tubular shaft and the second shaft, displacing the cutting member from a collapsed position to at least one deployed position, thereby defining at least one cutting diameter. ### Claim 22 (depends on 21) The method of claim 21 wherein the performing of relative movement of the first tubular shaft and the second shaft includes performing relative rotational movement of the first tubular shaft and the second shaft. ### Claim 23 (depends on 21) The method of claim 21 wherein the performing of relative movement of the first tubular shaft and the second shaft includes performing relative axial movement of the first tubular shaft and the second shaft. ### Claim 24 (depends on 21) The method of claim 21 wherein the performing of relative movement of the first tubular shaft and the second shaft includes performing relative rotational and axial movement of the first tubular shaft and the second shaft. ### Claim 25 (depends on 21) The method of claim 21 wherein the retrograde reamer further comprises: a flex member movably coupling the cutting member to a sidewall of the first tubular shaft at a location substantially opposite an opening in the sidewall; and a deployment member coupled to the cutting member, and wherein the method further comprises: pulling the deployment member distally; and in response to the deployment member being pulled distally, displacing the cutting member in a radial fashion from the collapsed position to the deployed position, the cutting member passing at least partially through the opening in the sidewall of the first tubular shaft while being displaced to the deployed position.