# US 10,441,437 B2 · System for determining the position of a knee prosthesis > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,441,437 B2 - Document ID: US10441437B2 - Status: Granted - Kind: B2 - Application number: 14/982,221 - Filed: 2015-12-29 - Published: 2016-04-21 - Granted: 2019-10-15 - Earliest claimed: 2000-11-06 - Assignees: OMNIlife science, Inc. - Applicants: OMNIlife Science, Inc. - Inventors: Stephane Lavallee - Web page: https://patentgrep.com/patent/US10441437B2 ## CPC - A61F 2/4657: {Measuring instruments used for implanting artificial joints (for surgical instruments A61B90/06)} - A61B 5/062: {using magnetic field} - A61B 6/032: {Transmission computed tomography [CT]} - A61B 17/154: {for preparing bone for knee prosthesis} - A61B 34/10: Computer-aided planning, simulation or modelling of surgical operations - A61B 34/20: Surgical navigation systems; Devices for tracking or guiding surgical instruments, e.g. for frameless stereotaxis - A61B 90/39: {Markers, e.g. radio-opaque or breast lesions markers} - A61B 17/155: {Cutting femur} - A61B 17/157: {Cutting tibia} - A61B 17/158: {Cutting patella} - A61B 90/36: {Image-producing devices or illumination devices not otherwise provided for} - A61B 2034/102: {Modelling of surgical devices, implants or prosthesis} - 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} - A61B 2034/2055: {Optical tracking systems} - A61B 2034/2068: {using pointers, e.g. pointers having reference marks for determining coordinates of body points} - A61B 2034/2072: {Reference field transducer attached to an instrument or patient} - A61B 2090/363: {Use of fiducial points} - A61B 2090/3916: {Bone tissue} - A61B 2090/3958: {emitting a signal} - A61B 2090/3962: {palpable} - A61B 2090/3979: {infrared} - A61B 2090/3983: {Reference marker arrangements for use with image guided surgery} - A61F: FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS (dental prosthetics A61C) - A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D) ## Abstract The present application provides an apparatus and method for determining a position of a joint prosthesis using a computer assisted orthopedic surgery system in support of an arthroplasty surgery. The apparatus and method includes attaching a first locatable element to a first bone on one side of a joint, providing a sensor having a second locatable element and moving the sensor in proximity of the joint to locate a plurality of positions of the sensor relative to the first locatable element using a tracking devise. The apparatus and method further includes selecting a generic model of a joint, determining the generic model in response to the plurality of positions located using the tracking device to generate a deformed model, determining a position for a joint prosthesis on the deformed model, and outputting on a display the determined position upon the deformed model. ## Claims ### Claim 1 A computer assisted orthopedic surgery system in support of an arthroplasty surgery of a patient's knee joint, comprising: a first locatable element attachable to a first bone on one side of the patient's knee joint; a sensor comprising a second locatable element, the sensor being movable in proximity of the patient's knee joint; a tracking device for intra-operatively locating a plurality of positions of the sensor relative to the first locatable element; a computer programmed to generate a computer model of the first bone that is specific to the patient in response to the plurality of positions of the tracking device that are specific to the patient without the use of pre-operative images and to provide an initial placement for a knee prosthesis on the computer model; and a display connected to the computer to output the initial placement of the knee prosthesis upon the computer model. ### Claim 2 (depends on 1) The computer assisted orthopedic surgery system of claim 1, wherein the computer is further programmed to provide an initial size of the knee prosthesis based on the generated computer model. ### Claim 3 (depends on 1) The computer assisted orthopedic surgery system of claim 1, wherein the computer model is generated without the use of pre-operative images that are specific to the patient. ### Claim 4 A computer assisted orthopedic surgery system in support of an arthroplasty surgery of a patient's knee joint, comprising: a first locatable element attachable to a first bone on one side of the patient's knee joint; a sensor comprising a second locatable element, the sensor being movable in proximity of the patient's knee joint; a tracking device for intra-operatively locating a plurality of positions of the sensor relative to the first locatable element; a computer model of a bone that is not based on pre-operative images, and wherein the computer model of the bone is based on data received by the tracking device that are specific to the patient; and a display connected to the computer to output the computer model. ### Claim 5 (depends on 4) The computer assisted orthopedic surgery system of claim 4, further comprising a computer configured to provide an initial size for a knee prosthesis based on the generated computer model. ### Claim 6 (depends on 4) The computer assisted orthopedic surgery system of claim 4, further comprising a computer configured to provide an initial placement for a knee prosthesis on the computer model. ### Claim 7 (depends on 4) The computer assisted orthopedic surgery system of claim 4, further comprising a computer configured to update the computer model in response to the plurality of positions of the tracking device that are specific to the patient. ### Claim 8 (depends on 4) The computer assisted orthopedic surgery system of claim 4, wherein the computer model of the bone is not based on pre-operative images that are specific to the patient. ### Claim 9 A computer assisted orthopedic surgery system in support of an arthroplasty surgery of a patient's knee joint, comprising: a first locatable element attachable to a first bone on one side of the patient's knee joint; a sensor comprising a second locatable element, the sensor being movable in proximity of the patient's knee joint; a tracking device for intra-operatively locating a plurality of positions of the sensor relative to the first locatable element; an initial computer model of a bone that is not based on pre-operative images; and a display connected to the computer to output the computer model. ### Claim 10 (depends on 9) The computer assisted orthopedic surgery system of claim 9, further comprising a computer configured to provide an initial size for a knee prosthesis based on the initial computer model. ### Claim 11 (depends on 9) The computer assisted orthopedic surgery system of claim 9, further comprising a computer configured to provide an initial placement for a knee prosthesis on the initial computer model. ### Claim 12 (depends on 9) The computer assisted orthopedic surgery system of claim 9, wherein the initial computer model of the bone is not based on pre-operative images that are specific to the patient.