MEASURING INSTRUMENT FOR VERSION ANGLE
First Claim
1. An instrument for measuring an angle about a cavity axis defined by a cavity extending into a head of a bone, the bone having been resected on a plane that is inclined relative to the cavity axis, the instrument comprising:
- a stem arranged to be inserted into the cavity;
a plane finder coupled to the stem arranged to contact the resection surface as the stem is inserted into the cavity and to move relative to the stem until the plane finder lies in a plane parallel to the resection surface, movement of the plane finder relative to the stem being indicative of the angle about the cavity axis between a radial position indicated by part of the stem and a line extending perpendicularly from the resection surface; and
a scale configured such that movement of the plane finder relative to the stem is indicated by the position of a portion of the plane finder relative to the scale.
2 Assignments
0 Petitions
Accused Products
Abstract
An instrument for measuring an angle about a cavity axis defined by a cavity extending into a head of a bone is provided, the bone having been resected on a plane that is inclined relative to the cavity axis. The instrument includes a stem arranged to be inserted into the cavity, a plane finder and a scale. The plane finder is coupled to the stem and arranged to contact the resection surface as the stem is inserted into the cavity and to move relative to the stem until the plane finder lies in a plane parallel to the resection surface. Movement of the plane finder relative to the stem is indicative of the angle about the cavity axis between a radial position indicated by part of the stem and a line extending perpendicularly from the resection surface. The scale is configured such that movement of the plane finder relative to the stem is indicated by the position of a portion of the plane finder relative to the scale.
44 Citations
20 Claims
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1. An instrument for measuring an angle about a cavity axis defined by a cavity extending into a head of a bone, the bone having been resected on a plane that is inclined relative to the cavity axis, the instrument comprising:
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a stem arranged to be inserted into the cavity; a plane finder coupled to the stem arranged to contact the resection surface as the stem is inserted into the cavity and to move relative to the stem until the plane finder lies in a plane parallel to the resection surface, movement of the plane finder relative to the stem being indicative of the angle about the cavity axis between a radial position indicated by part of the stem and a line extending perpendicularly from the resection surface; and a scale configured such that movement of the plane finder relative to the stem is indicated by the position of a portion of the plane finder relative to the scale. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A method of measuring an angle about a longitudinal axis defined by a cavity extending into a head of a bone, the bone having been resected on a plane which is inclined to the longitudinal cavity axis, the method comprising:
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inserting a stem into the cavity; coupling a plane finder to the stem, the plane finder contacting the resection surface as the stem is inserted into the cavity, the plane finder moving relative to the stem until the plane finder lies in a plane parallel to the resection surface; and measuring movement of the plane finder relative to the stem at a scale coupled to the stem, said measured movement being indicative of the angle about the longitudinal cavity axis between a radial position indicated by part of the stem and a line extending perpendicularly from the resection surface. - View Dependent Claims (18, 19, 20)
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Specification