Sighting instrument for determining the mechanical axis of the femur
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Accused Products
Abstract
A device for the determination of a plane containing the mechanical axis of the femur includes a mechanical member of articulated and or/sliding elements for the determination and memorization of two positions in space (F1 and F2) of the same point (F) of the knee, freely selected, when the knee is in position P1 and P2, relative to a referential system. These positions are obtained by rotation of the inferior limb from position P1 to position P2, about the centre of the femoral head. The orientation of an omega plan perpendicular to the frontal or sagittal plane containing the centre of the femoral head and the centre of the knee can be materialized by a rod contained in this plane, which rod is fixed perpendicularly and in the middle of the arm having at the ends two localization elements for points F1 and F2.
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Citations
49 Claims
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1-26. -26. (canceled)
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27. An instrument for the determination of a plane containing the mechanical axis of the femur of an inferior limb comprising a device in which there is provided:
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a mechanical means made of articulated and/or sliding elements in order to determine and memorize two positions, freely selected, in space (F1 and F2) of the same point (F) of the knee, when said knee is brought in positions P1 and P2, relative to a referential system, positions being obtained by rotation of the inferior limb from the position P1 towards the position P2, about the centre of the femoral head, a means for materializing an orientation of a plane omega passing through the middle of a line segment defined by the two said positions F1 and F2, perpendicular to this segment and containing the centre of the femoral head. - View Dependent Claims (28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 49)
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42. An instrument for determining a plane containing the mechanical axis of the femur comprising:
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a mechanical means of articulated bars comprising an arm whose two points can be freely immobilized each in a position fixed and constant respectively to two positions in the space (F1 et F2) of a freely selected same point (F) of the knee, when said knee is in two different positions (P1 et P2) in the frontal or sagittal plane, a means for materializing the orientation of a plane passing through the middle of the straight line segment defined by the two aforementioned positions F1 and F2, perpendicular to this segment and containing the centre of the femoral head.
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43. A method for the determination of the mechanical axis of the inferior limb comprising the steps of:
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determining and memorizing, by a mechanical means of articulated or sliding bars, two points in the space (F1, F2) of the same freely selected point (F) of the knee, in two positions P1 and P2, relative to a surgery table or to the pelvis of the patient, the said positions being obtained by rotation of the inferior limb in the frontal or sagittal plane, about the centre of the hip, orientating a rod in the middle and perpendicularly to the straight line separating the two localization means immobilized during the determination of points (F1, F2). - View Dependent Claims (44, 45, 46, 47, 48)
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Specification