System and method for cavity generation for surgical planning and initial placement of a bone prosthesis
First Claim
1. A method for planning the position of a prosthesis within a bone, said prosthesis having a proximal and a distal portion, said method comprising:
- providing a model of the prosthesis and a model of the bone; and
generating based on the prosthesis model a first cavity model intended to accommodate the prosthesis within the bone,said cavity model comprising an access region, a proximal cavity region, a distal cavity region, and a distal extension region,said distal cavity region dimensioned to provide an interference fit between said prosthesis model and said bone, andsaid distal extension region extending beyond the distal end of the prosthesis to provide room for subsidence of the prosthesis within the bone.
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Accused Products
Abstract
Methods, systems and apparatus for planning the position of a prosthesis in a long bone in orthopaedic surgical procedures, such as hip replacement surgery, knee replacement surgery, long bone osteotomies, and the like. A bone model is generated from a scanned image of a bone, a prosthesis model is selected from a library of prosthesis models and then a cavity model is formed based on the prosthesis model and/or the bone model. The cavity model may then be positioned over the bone model, either interactively by the surgeon or automatically through an algorithm based on clinical parameters, to determine a reasonable location for implantation of a prosthesis within the bone. The cavity model allows the surgeon to optimize placement of the implant within the bone, and it provides important clinical information to the surgeon, such as areas in which press fits are provided, extension areas for possible subsidence and access areas for allowing the surgeon to insert the implant into the cavity.
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Citations
30 Claims
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1. A method for planning the position of a prosthesis within a bone, said prosthesis having a proximal and a distal portion, said method comprising:
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providing a model of the prosthesis and a model of the bone; and generating based on the prosthesis model a first cavity model intended to accommodate the prosthesis within the bone, said cavity model comprising an access region, a proximal cavity region, a distal cavity region, and a distal extension region, said distal cavity region dimensioned to provide an interference fit between said prosthesis model and said bone, and said distal extension region extending beyond the distal end of the prosthesis to provide room for subsidence of the prosthesis within the bone. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A method for planning the position of a prosthesis within a bone, said method comprising:
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providing a model of the prosthesis and a model of the bone; generating based on the prosthesis model a first cavity model intended to accommodate the prosthesis within the bone; wherein the first cavity model comprises an actual cavity and an access region, the method further comprising generating an access region model based on the model of the prosthesis to provide access to the actual cavity; and wherein the access region model generating step includes determining a cross-sectional area of a proximal portion of the model of the prosthesis and trimming said cross-sectional area based on a recession angle and a lateral trimming distance. - View Dependent Claims (25, 26)
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23. A method for planning the position of a prosthesis within a bone, said method comprising:
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providing a model of the prosthesis and a model of the bone; generating based on the prosthesis model a first cavity model intended to accommodate the prosthesis within the bone; wherein the positioning step comprises automatically positioning the cavity model within the bone model based on measurements of the bone model and prothesis fit criteria; and wherein the measurements of the bone model include marking the top of a medial arc portion of the bone model and measuring inner and outer profiles of a distal canal region of the bone model.
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24. A method for planning the position of a prosthesis within a bone, said method comprising:
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providing a model of the prosthesis and a model of the bone; generating based on the prosthesis model a first cavity model intended to accommodate the prosthesis within the bone; and adjusting the dimensions of the first cavity model to produce a second cavity model and repositioning the second cavity model by observing images of the bone model and the second cavity model on the display and adjusting the relative positions of the images as they appear on the display.
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27. A method for planning the position of a prosthesis within a bone, said prosthesis having a proximal and a distal portion, said method comprising:
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providing a model of the bone; providing a first cavity model intended to accommodate the prosthesis within the bone, said cavity model comprising an access region, a distal cavity region dimensioned to provide an interference fit between a prosthesis model and the bone, and a distal extension region extending beyond the distal cavity region; and positioning the cavity model in the bone model. - View Dependent Claims (28, 29, 30)
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Specification