METHOD AND APPARATUS FOR DETERMINING ACETABULAR COMPONENT POSITIONING
First Claim
1. Apparatus for orienting a surgical instrument, comprising:
- a frame having at least three legs for placement on a subject to define a reference plane relative to the subject; and
a guide positionable on said frame to define an orientation with respect to said frame.
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Accused Products
Abstract
An instrument for establishing orientation of a pelvic prosthesis comprises a tri-pod having an angularly adjustable guide rod on it. The tips of the legs define a plane, and the guide rod is set by the surgeon to a defined orientation with respect to this plane on the basis of preoperative studies. In use, two of the legs of the instrument are positioned by the surgeon at defined anatomical locations on the pelvis (e.g., a point in the region of the posterior/inferior acetabulum and a point on the anterior superior iliac spine). The third leg then lands on the pelvis at a point determined by the position of the first two points, as well as by the separations between the third leg and the other two legs. The separations are adjustable, but are preferably fixed percentages of the separation between the first and second legs. The position of the guide rod then defines with respect to the actual pelvis the direction for insertion of a prosthesis.
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Citations
34 Claims
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1. Apparatus for orienting a surgical instrument, comprising:
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a frame having at least three legs for placement on a subject to define a reference plane relative to the subject; and a guide positionable on said frame to define an orientation with respect to said frame. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method for orienting a surgical instrument with respect to the pelvis of a subject, comprising:
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placing a first leg of a tripod in the area of the posterior inferior acetabulum of said subject; placing a second leg of the tripod in the area of the anterior superior iliac spine of said subject; and placing a third leg of the tripod on the ilium of said subject, the ends of the legs in contact with the subject thereby defining a plane with respect to which said instrument may be oriented. - View Dependent Claims (17, 18, 19, 20, 21, 22)
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23. A method for registering a surgical navigation system with respect to a subject, comprising:
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placing a first leg of a tripod in the area of the posterior inferior acetabulum of a subject; placing a second leg of the tripod in the area of the anterior superior iliac spine of said subject; and placing a third leg of the tripod on the ilium of said subject, the ends of the legs in contact with the subject thereby defining a plane with respect to which said navigation system may be oriented. - View Dependent Claims (24, 25, 26)
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27. A method for registering a surgical navigation system with respect to a subject, comprising:
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registering a first point in the area of the posterior inferior acetabulum of a subject; registering a second point in the area of the anterior superior iliac spine of said subject; and registering a third point on the ilium of said subject, said points defining a plane with respect to which said navigation system may be oriented. - View Dependent Claims (28, 29, 30)
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31. A method for registering a surgical navigation system with respect to a subject, comprising a virtual instrument
wherein the first of three or more points is digitized in the area of the posterior inferior acetabulum of a subject; -
the second point is digitized in the area of the anterior superior iliac spine of said subject at a predetermined distance from the first point; and the third point is digitized in a location that is on the bone surface, a specified distance from the 1st point, and a specified distance from the second point of said subject, these three points digitized on the subject thereby defining a plane with respect to which said navigation system may be oriented. - View Dependent Claims (32, 33, 34)
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Specification