# US 11,998,280 B2 · Patient-specific instrumentation for implant revision surgery > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,998,280 B2 - Document ID: US11998280B2 - Status: Granted - Kind: B2 - Application number: 18/154,233 - Filed: 2023-01-13 - Published: 2023-06-08 - Granted: 2024-06-04 - Earliest claimed: 2017-12-12 - Assignees: Orthosoft Ulc - Applicants: Orthosoft Ulc - Inventors: Ramnada Chav; Jean-Sebastien Merette; Tin Nguyen; Karine Duval; Pierre Couture - Web page: https://patentgrep.com/patent/US11998280B2 ## CPC - A61B 34/10: Computer-aided planning, simulation or modelling of surgical operations - A61B 6/12: Arrangements for detecting or locating foreign bodies - A61B 17/155: {Cutting femur} - A61B 17/157: {Cutting tibia} - G06T 17/00: Three-dimensional [3D] modelling for computer graphics - G06T 19/20: Editing of three-dimensional [3D] images, e.g. changing shapes or colours, aligning objects or positioning parts - A61B 2017/568: {produced with shape and dimensions specific for an individual patient} - A61B 2034/104: {Modelling the effect of the tool, e.g. the effect of an implanted prosthesis or for predicting the effect of ablation or burring} - A61B 2034/105: {Modelling of the patient, e.g. for ligaments or bones} - A61B 2034/107: {Visualisation of planned trajectories or target regions} - A61B 2034/108: {Computer aided selection or customisation of medical implants or cutting guides} - G06T 2200/04: involving 3D image data - G06T 2200/08: involving all processing steps from image acquisition to 3D model generation - G06T 2210/41: Medical - G06T 2219/012: Dimensioning, tolerancing - G06T 2219/2021: Shape modification - A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D) - G06T: IMAGE DATA PROCESSING OR GENERATION, IN GENERAL ## Abstract A system for creating at least one model of a bone and implanted implant comprises a processing unit; and a non-transitory computer-readable memory communicatively coupled to the processing unit and comprising computer-readable program instructions executable by the processing unit for: obtaining at least one image of at least part of a bone and of an implanted implant on the bone, the at least one image being patient specific, obtaining a virtual model of the implanted implant using an identity of the implanted implant, overlaying the virtual model of the implanted implant on the at least one image to determine a relative orientation of the implanted implant relative to the bone in the at least one image, and generating and outputting a current bone and implant model using the at least one image, the virtual model of the implanted implant and the overlaying. ## Claims ### Claim 1 A system for guiding surgical alterations on a bone in revision surgery, comprising: a processing unit; and a non-transitory computer-readable memory communicatively coupled to the processing unit and comprising computer-readable program instructions executable by the processing unit for: obtaining at least one image of at least part of a bone and of an implanted implant on the bone, the at least one image being patient specific, obtaining a virtual model of the implanted implant using an identity of the implanted implant, the virtual model including orientation data for the implanted implant, overlaying the virtual model of the implanted implant on the at least one image to determine a relative orientation of the implanted implant relative to the bone in the at least one image, generating and outputting a current bone and implant model using the at least one image, the virtual model of the implanted implant and the overlaying, and guiding alterations in the bone using the current bone and implant model. ### Claim 2 (depends on 1) The system according to claim 1, wherein obtaining a virtual model of the implanted implant includes obtaining dimensional data for the implanted implant. ### Claim 3 (depends on 2) The system according to claim 2, further comprising sizing the at least one current bone and implant model using said dimensional data. ### Claim 4 (depends on 1) The system according to claim 1, wherein obtaining a virtual model of the implanted implant includes obtaining at least one axis of implanted implant. ### Claim 5 (depends on 4) The system according to claim 4, wherein obtaining orientation data for the implanted implant includes obtaining a frontal plane, a sagittal plane and/or a transverse plane of the implanted implant. ### Claim 6 (depends on 4) The system according to claim 4, further comprising determining a joint line for the current bone and implant model using said orientation data. ### Claim 7 (depends on 4) The system according to claim 4, further comprising identifying at least one bone axis for the current bone and implant model using said orientation data. ### Claim 8 (depends on 7) The system according to claim 7, wherein identifying at least one bone axis for the current bone and implant model using said orientation data includes identifying the mechanical axis of the bone. ### Claim 9 (depends on 4) The system according to claim 4, wherein obtaining at least one axis of implanted implant includes obtaining the mechanical axis of the bone. ### Claim 10 (depends on 1) The system according to claim 1, wherein the at least one image of at least part of a bone includes two or more radiographic images of the bone, and wherein obtaining at least one image of at least part of a bone includes generating a 3D bone model from the two or more radiographic images of the bone. ### Claim 11 (depends on 1) The system according to claim 1, wherein obtaining a virtual model of the implanted implant using an identity of the implanted implant includes generating a 3D model of the implanted implant from the at least one image, and comparing dimensions of 3D model of the implanted implant to a database of implant geometries to recognize the identity of the implanted implant. ### Claim 12 (depends on 1) The system according to claim 1, wherein obtaining a virtual model of the implanted implant using an identity of the implanted implant includes obtaining a 3D CAD model of the implanted implant. ### Claim 13 (depends on 1) The system according to claim 1, wherein generating and outputting a current bone and implant model includes generating a model of a tibia with implanted implant at a knee and/or of a femur with implanted implant at the knee. ### Claim 14 (depends on 1) The system according to claim 1, wherein guiding alterations in the bone using the current bone and implant model includes guiding a robotic arm using the current bone and implant model.