# US 9,517,078 B2 · Bone milling tool, assorted set and system with bone milling tool > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,517,078 B2 - Document ID: US9517078B2 - Status: Granted - Kind: B2 - Application number: 13/747,982 - Filed: 2013-01-23 - Published: 2013-08-01 - Granted: 2016-12-13 - Earliest claimed: 2012-01-24 - Assignees: Zimmer, Inc. - Applicants: Zimmer GmbH - Inventors: Uwe Pech - Web page: https://patentgrep.com/patent/US9517078B2 ## CPC - A61B 17/1682: {for the foot or ankle} - A61B 17/1617: {with mobile or detachable parts} - A61B 17/88: {Osteosynthesis instruments;} Methods or means for implanting or extracting internal {or external} fixation devices {(A61B17/7074 takes precedence)} - A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D) ## Abstract A surgical bone milling tool, in particular for the arthrodesis of a, preferably the first, metatarsophalangeal joint, with a rotatable milling cutter holder and at least one milling cutter for the production of a concave or convex milling contour in the bone, which is able to be fixed detachably on the milling cutter holder by a fixing element. Provision is made that the fixing element comprises a detent having a spring element provided for the detachable engagement of the milling cutter on the milling cutter holder. ## Claims ### Claim 1 A surgical bone milling tool for the arthrodesis of a metatarsophalangeal joint comprising: a rotatable milling cutter holder, the milling cutter holder operable to rotate relative to a bone of the metatarsophalangeal joint during a bone milling procedure; and at least one milling cutter for the production of a concave or convex milling contour in a bone; wherein the milling cutter is removably fixed on the milling cutter holder by a fixing element that provides for detachable engagement of the milling cutter on the milling cutter holder, the fixing element comprising a spring element that extends peripherally around and engages at least a portion of an outer surface of the milling cutter holder, and wherein in an attached state the milling cutter and the milling cutter holder are rotationally fixedly coupled together, such that the milling cutter is incapable of rotating relative to the milling cutter holder, to allow simultaneous rotation of the milling cutter with the milling cutter holder. ### Claim 2 (depends on 1) The bone milling tool according to claim 1, wherein the spring element is constructed and arranged such that the spring element is able to be tensioned in a radial direction on engaging and/or releasing of the milling cutter, and in the engaged state is received into a spring element recess. ### Claim 3 (depends on 1) The bone milling tool according to claim 1, wherein the spring element is secured in a groove of the milling cutter holder and on engaging of the milling cutter is tensioned by direct interaction with the milling cutter. ### Claim 4 (depends on 3) The bone milling tool according to claim 3, wherein the milling cutter penetrates the spring element in the engaged state axially inwards or embraces it externally. ### Claim 5 (depends on 1) The bone milling tool according to claim 1, wherein the spring element comprises a slotted spring ring. ### Claim 6 (depends on 1) The bone milling tool according to claim 1, wherein the spring element comprises part-ring-shaped springs, spaced apart in peripheral direction. ### Claim 7 (depends on 1) The bone milling tool according to claim 1, wherein a leading chamfer is provided for radial tensioning on the milling cutter. ### Claim 8 (depends on 1) The bone milling tool according to claim 1, wherein a tool mount for a mount of a releasing tool is provided on the milling cutter holder, wherein the milling cutter extends into the mount perpendicularly to a longitudinal extent of the mount, such that the milling cutter, by twisting of the releasing tool in the mount, is able to be acted upon by force axially in a releasing direction. ### Claim 9 (depends on 1) The bone milling tool according to claim 1, further comprising a form-fitting means for securing the milling cutter against rotation relative to the milling cutter holder. ### Claim 10 (depends on 9) The bone milling tool according to claim 9, wherein the form-fitting means comprises at least one axial guide for guiding the milling cutter for securing and/or releasing the milling cutter. ### Claim 11 (depends on 10) The bone milling tool according to claim 10, wherein the spring element penetrates the form-fitting means in peripheral direction. ### Claim 12 (depends on 11) The bone milling tool according to claim 11, wherein the milling cutter is constructed with at least two cutter parts which are able to be inserted into one another axially. ### Claim 13 (depends on 1) The bone milling tool according to claim 1, wherein the milling cutter has a serration. ### Claim 14 (depends on 1) The bone milling tool according to claim 1, wherein the milling cutter has cutter parts intersecting one another at right angles. ### Claim 15 (depends on 1) The bone milling tool according to claim 1, wherein the milling cutter has a centering point. ### Claim 16 (depends on 1) An assorted set comprising a bone milling tool according to claim 1 with a first milling cutter and at least a second milling cutter, differing from the first milling cutter, by having a different diameter. ### Claim 17 (depends on 1) The bone milling tool according to claim 1, wherein the spring element is receivable within at least one spring element recess formed in the milling cutter. ### Claim 18 A surgical bone milling tool for the arthrodesis of a metatarsophalangeal joint comprising: a rotatable milling cutter holder, the milling cutter holder operable to rotate relative to a bone of the metatarsophalangeal joint during a bone milling procedure; and at least one milling cutter for the production of a concave or convex milling contour in a bone; wherein the milling cutter is removably fixed on the milling cutter holder by a fixing element that provides for detachable engagement of the milling cutter on the milling cutter holder, the fixing element comprising a spring element, and wherein in an attached state the milling cutter and the milling cutter holder are rotationally fixedly coupled together to allow simultaneous rotation of the milling cutter with the milling cutter holder; and wherein the spring element extends peripherally around and engages at least a portion of an outer surface of the milling cutter holder. ### Claim 19 A surgical bone milling tool for the arthrodesis of a metatarsophalangeal joint comprising: a rotatable milling cutter holder, the milling cutter holder operable to rotate relative to a bone of the metatarsophalangeal joint during a bone milling procedure; and at least one milling cutter for the production of a concave or convex milling contour in a bone; wherein the milling cutter is removably fixed on the milling cutter holder by a fixing element that provides for detachable engagement of the milling cutter on the milling cutter holder, the fixing element comprising a spring element that extends peripherally around and engages at least a portion of an outer surface of the milling cutter holder, and wherein in an attached state the milling cutter and the milling cutter holder are rotationally fixedly coupled together, such that the milling cutter is secured against rotation relative to the milling cutter holder, to allow simultaneous rotation of the milling cutter with the milling cutter holder.