# US 11,304,707 B2 · Rotary mill > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,304,707 B2 - Document ID: US11304707B2 - Status: Granted - Kind: B2 - Application number: 16/533,427 - Filed: 2019-08-06 - Published: 2019-11-28 - Granted: 2022-04-19 - Earliest claimed: 2013-10-07 - Assignees: Biomet UK Healthcare Limited - Applicants: Biomet UK Healthcare Limited; David Wycliffe Murray; Christopher Dodd; John Joseph O'Connor - Inventors: Duncan Andrew Ridley; Mona Alinejad; Russell Lloyd; David Wycliffe Murray; Christopher Dodd; John Joseph O'Connor - Web page: https://patentgrep.com/patent/US11304707B2 ## CPC - A61B 17/16: Instruments for performing osteoclasis; Drills or chisels for bones; Trepans {(arthroscopic bone cutters A61B17/320016)} - A61B 17/1675: {for the knee} - A61B 17/17: Guides {or aligning means} for drills {, mills, pins or wires} - A61B 17/1764: {for the knee} - A61B 2017/1602: {Mills} - A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D) ## Abstract A rotary mill comprising a body portion having a milling surface for milling a first bone, a guide portion having a guide body, and inter-engageable guide formations formed on the body portion and guide portion, the guide body having a projection which is adapted to hold a second bone away from the rotary mill during the milling operation. ## Claims ### Claim 1 A rotary mill comprising a body portion having a milling surface for milling a first bone, a guide portion having a guide body, and inter-engageable guide formations formed on the body portion and guide portion, the guide body having a projection which is adapted to hold a second bone away from the rotary mill during the milling operation, wherein the inter-engageable guide formations comprise a central bore extending along a rotary axis of the body portion and a guide peg extending from the guide body, the guide peg being operable to be received in the central bore of the body portion. ### Claim 2 (depends on 1) The rotary mill as claimed in claim 1, wherein the projection is integrally formed with the guide body. ### Claim 3 (depends on 1) The rotary mill as claimed in claim 1, wherein the projection comprises an arm which is shaped to receive the milling surface without impingement. ### Claim 4 (depends on 1) The rotary mill as claimed in claim 1, wherein the projection is shaped to receive the milling surface closely over its full range of movement relative to the guide body. ### Claim 5 (depends on 1) The rotary mill as claimed in claim 1, wherein the projection is provided with a recess on a first side which is adapted to a.ccommodate the milling surface without impingement. ### Claim 6 (depends on 1) The rotary mill as claimed in claim 1, wherein a second side of the projection may be polished chamfered or otherwise shaped to avoid damage to the second bone. ### Claim 7 (depends on 1) The rotary mill as claimed in claim 1, wherein the projection is removeably attached to the guide body. ### Claim 8 (depends on 1) The rotary mill as claimed in claim 1, wherein the projection extends from the guide body in a direction substantially parallel to a longitudinal axis of the guide peg. ### Claim 9 (depends on 1) The rotary mill as claimed in claim 1, further comprising additional guide portions, each guide portion being of a different size to other guide portions. ### Claim 10 (depends on 1) The rotary mill as claimed in claim 1, wherein the guide peg comprises an abutment surface operable to abut a corresponding abutment surface in the central bore of the body portion. ### Claim 11 (depends on 10) The rotary mill as claimed in claim 10, wherein the abutment surface comprises a distal surface of the peg. ### Claim 12 (depends on 11) The rotary mill as claimed in claim 11, wherein the guide body has substantially the form of a trial prosthesis component. ### Claim 13 (depends on 1) The rotary mill as claimed in claim 1, wherein the guide body comprises a trail prosthesis component. ### Claim 14 (depends on 13) The rotary mill as claimed in claim 13, wherein the guide body comprises a trial unicondylar femoral prosthesis component. ### Claim 15 (depends on 14) The rotary mill as claimed in claim 14, wherein the guide body is operable to guide reaming of a region superior to the anterior edge of the guide body. ### Claim 16 (depends on 1) The rotary mill as claimed in claim 1, wherein the inter-engageable guide formations comprise a central bore extending along a rotary axis of the body portion and a guide peg extending from the guide body, the guide peg being operable to be received in the central bore of the body portion, and wherein the projection is integrally formed with the guide body. ### Claim 17 A rotary mill comprising a body portion including a first guide formation and a mulling surface adapted for milling a first bone; and a guide portion including a second guide formation and a projection adapted to hold a second bone away from the rotary mill while milling the first bone; the first guide formation structured to mate with the second guide formation to slidably couple the body portion to the guide portion, wherein the first guide formation comprises a bore and the second guide formation comprises a peg configured for insertion within the bore. ### Claim 18 (depends on 17) The rotary mill of claim 17, wherein the projection includes a polished bone contacting surface configured to sit substantially flat against a resected end of the second bone.