DISTRACTOR SYSTEM
First Claim
1. A computer assisted orthopaedic surgery system for performing joint replacement of a joint that is defined by a first bone and a second bone comprising:
- means for tracking the position of the first bone relative to the second bone;
means for planning a position of at least one virtual implant relative to at least one of the first and second tracked bones; and
means for controlling the relative position of the first and second tracked bones in at least one direction and with a controllable device that is coupled to the second bone and is operated such that kinematics of the joint behave in the manner as if an actual implant corresponding to the virtual implant was installed according to the planned implant position.
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Accused Products
Abstract
According to one aspect of the present invention, a computer assisted orthopaedic surgery system for performing joint replacement or resurfacing surgeries includes a computer that contains software that is adapted to permit an operator of the system to physically evaluate post-operative laxity and stiffness of a joint based on planned implant placement, prior to all cuts being made for at least one side of the joint to accommodate the implant and before components of the implant are installed in the joint, wherein the planned implant placement is measured in terms of a position of at least one virtual implant.
287 Citations
34 Claims
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1. A computer assisted orthopaedic surgery system for performing joint replacement of a joint that is defined by a first bone and a second bone comprising:
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means for tracking the position of the first bone relative to the second bone; means for planning a position of at least one virtual implant relative to at least one of the first and second tracked bones; and means for controlling the relative position of the first and second tracked bones in at least one direction and with a controllable device that is coupled to the second bone and is operated such that kinematics of the joint behave in the manner as if an actual implant corresponding to the virtual implant was installed according to the planned implant position.
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2. A computer assisted orthopaedic surgery system for performing joint replacement of a joint that is defined by a first bone and a second bone comprising:
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a first device that is coupled to the second bone for moving the second bone in relation to the first bone; and a controller that permits an operator to plan a position of an implant device prior to making cuts in at least one of the first and second bones to accommodate the implant device, wherein the controller calculates the planned implant placement by computing theoretical contact positions of first and second virtual implant components that define the implant device based on spatial information and relative positions of the first and second virtual implant components, the controller controlling the position and movement of the first device coupled to the second bone such that actual positions of the first and second bones and the theoretical contact positions for the first and second virtual components converge and contact is simulated between the first and second virtual implant components over a range of motion. - View Dependent Claims (3, 4)
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5. A computer assisted orthopaedic surgery system for performing joint replacement or resurfacing surgeries comprising:
a computer that contains software that is adapted to measure and track a relationship between a first virtual implant component to be associated with a first bone and a second virtual implant component to be associated with a second bone and simulate the relationship of the two virtual implant components over a desired range of motion such that the two virtual implant components remain in contact with one another along outer surfaces thereof over the range of motion, the software receiving positional information for the two virtual implant components over the range of motion and then calculates the optimal locations for bone cuts so as to position the two virtual implants in the desired relationship where the outer surfaces are in contact with one another over the range of motion. - View Dependent Claims (6, 7, 8, 9, 10, 11)
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12. A method for physically evaluating post-operative laxity and stiffness of a joint based on a planned implant placement, prior to cuts being made for at least one side of the joint to accommodate the implant and before components of the implant are installed in the joint comprising the steps of:
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selecting a first implant component that is to be associated with a first bone; selecting a second implant component that is to be associated with a second bone; generating a first virtual implant based in part on the selected first implant component and which is representative of the first implant component; generating a second virtual implant based in part on the selected second implant component and which is representative of the second implant component; displaying images of the first and second bones on a screen; displaying the first virtual implant on the screen by superimposing it on the first bone; displaying the second virtual implant on the screen by superimposing it on the second bone; and moving the first bone relative to the second bone over a range of motion by means of manipulating an actuator that is coupled to the second bone, while measuring positions of the first and second bones that results in outer surfaces of the first and second virtual implants being in contact with one another over the range of motion resulting in the joint substantially behaving as through the first and second virtual implants are installed in planned implant positions. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. A method for performing computer assisted orthopaedic surgery to replace a joint that is defined by a first bone and a second bone comprising the steps of:
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tracking the position of a first bone relative to an one other second bone; planning a position of at least one virtual implant relative to at least one of the tracked bones; and controlling the relative positions of the tracked first and second bones in at least one direction using a first device that is coupled to at least the second bone to permit movement of the second bone relative to the first bone over a range of motion such that the joint connecting the first and second bones functions, over a range of motion, as through the at least one virtual implant was installed in the planned position. - View Dependent Claims (24, 25)
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26. A method for performing computer assisted orthopaedic surgery to replace a joint that is defined by a first bone and a second bone comprising the steps of:
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selecting a first implant component that is to be associated with a first bone; selecting a second implant component that is to be associated with a second bone; generating a first virtual implant based in part on the selected first implant component and which is representative of the first implant component; generating a second virtual implant based in part on the selected second implant component and which is representative of the second implant component; displaying images of the first and second bones on a screen; displaying the first virtual implant on the screen by superimposing it on the first bone; displaying the second virtual implant on the screen by superimposing it on the second bone; positioning a distraction device between the first and second bones, the distraction device supporting the first bone and being coupled to the second bone; and adjusting and controlling a height of the distraction device such that a height of the distraction device is calculated based on a difference in geometry between the first virtual implant and the first bone at a chosen knee flexion orientation. - View Dependent Claims (27, 28, 29)
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30. A computer assisted orthopaedic surgery system for performing implant surgery on a joint that is defined by a first bone and a second bone comprising:
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a computer configured to plan the position and/or orientation of at least one first virtual implant with respect to the first bone and at least one second implant with respect to the second bone, a three-dimensional position measuring device in communication with the computer, configured to measure the relative positions of the first and second bones; and a first device selected from the group consisting of a distraction and a robotic device, each of which has at least one degree of freedom that is in communication with and is controlled by the computer, and is configured to limit the relative positions of the first and second bone so that the first virtual implant is prevented from overlapping the second virtual implant. - View Dependent Claims (31, 32, 33, 34)
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Specification