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US 6,991,655 B2Granted
Computer assisted insertion of an artificial hip joint
AssigneeOrthoMeter A/S
InventorBjorn Franc Iversen
Life of this patent
Estimating the term…
Abstract
A system and a method for ensuring correct insertion of the components of a femoral prosthesis, i.e. a prosthesis stem with a ball head and a cup with recess for receipt of the ball head, is described. The system comprises a tool for controlling the mutual angle between the prosthesis stem and the cup in addition to a positioning system for definition of a reference system and for determination and adjustment of the offset and length of the leg.
Claims12
A method for computer assisted insertion of an artificial hip joint prosthesis comprising:
- making the anatomy of a hip available for insertion of parts of said prosthesis, wherein said parts of said prosthesis comprise a prosthesis stem and a cup;
- preparing for insertion of said parts of said prosthesis;
- inserting temporarily said prosthesis stem into a femur;
- inserting temporarily said cup into a pelvis;
- inserting a positioning tool between said prosthesis stem and said cup, said positioning tool configured to control an angle between said parts of the prosthesis;
- assembling the artificial hip joint;
- stretching said hip and a knee associated with said hip;
- placing a foot associated with said hip and said knee in a position configured with the toes pointing forward relative to a body associated with said foot;
- measuring the position of said parts of the prosthesis with a position determination instrument;
- luxating the hip joint;
- removing said parts of the prosthesis from said femur and said pelvis;
- inserting said cup into said pelvis into a predetermined position, said predetermined position being equal to a position measured by said position determination instrument;
- controlling said insertion of said cup with said position determination instrument;
- fixing said cup into said predetermined position;
- fixing said prosthesis stem to said femur;
- and
- reassembling said hip joint.
14 more elements
A method for computer assisted insertion of an artificial hip joint prosthesis comprising:
- making the anatomy of a hip available for insertion of parts of said prosthesis, wherein said parts of the prosthesis comprise a prosthesis stem and a cup;
- preparing for insertion of said parts of the prosthesis;
- inserting temporarily said prosthesis stem into a femur;
- inserting temporarily said cup into a pelvis;
- inserting a positioning tool between said prosthesis stem and said cup, said positioning tool configured to control an angle between said parts of the prosthesis;
- assembling the artificial hip joint;
- stretching said hip and a knee associated with said hip;
- placing a foot associated with said hip and said knee in a position configured with the toes pointing forward relative to a body associated with said foot;
- measuring the position of said parts of the prosthesis with a position determination instrument;
- luxating the hip joint;
- removing said parts of the prosthesis from said femur and said pelvis;
- inserting said prosthesis stem into said femur in a predetermined position, said predetermined position being equal to a position measured by said position determination instrument;
- controlling said insertion of said prosthesis stem with said position determination instrument wherein said femur is placed into said predetermined position;
- fixing said prosthesis stem to said femur in said predetermined position;
- inserting said cup into said pelvis into a predetermined position, said predetermined position being equal to a position measured by said position determination instrument;
- controlling said insertion of said cup with said position determination instrument;
- fixing said cup into said pelvis in said predetermined position;
- and
- reassembling said hip joint.
16 more elements
Dependencies are inferred from the claim text.