Computer assisted insertion of an artificial hip joint
First Claim
1. A system of ensuring the desired mutual positioning of the main components of an artificial hip joint prosthesis, the prosthesis including a prosthesis stem with a ball head and a cap with a recess for receipt of the ball head, the system comprising:
- a positioning tool configured to interact with a neck of the prosthesis stem and the cup, wherein an angle between the prosthesis stem and the cup can be controlled;
at least one sensor placed at the positioning tool;
a position determination instrument in operative communication with said at lease one sensor, said position determination instrument configured to read a position and an orientation within a room.
2 Assignments
0 Petitions
Accused Products
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.
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Citations
18 Claims
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1. A system of ensuring the desired mutual positioning of the main components of an artificial hip joint prosthesis, the prosthesis including a prosthesis stem with a ball head and a cap with a recess for receipt of the ball head, the system comprising:
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a positioning tool configured to interact with a neck of the prosthesis stem and the cup, wherein an angle between the prosthesis stem and the cup can be controlled;
at least one sensor placed at the positioning tool;
a position determination instrument in operative communication with said at lease one sensor, said position determination instrument configured to read a position and an orientation within a room. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for computer assisted insertion of an artificial hip joint comprising:
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making the anatomy of a hip available for insertion of parts of a 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. - View Dependent Claims (8, 9, 10, 11, 12, 17, 18)
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13. A method for computer assisted insertion of an artificial hip joint comprising:
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making the anatomy of a hip available for insertion of parts of a prosthesis, wherein said parts of a prosthesis comprise a prosthesis stem and a cup;
preparing for insertion of said parts of a 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. - View Dependent Claims (14, 15, 16)
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Specification