Apparatus for producing a conical surface on a bone
First Claim
1. An apparatus for producing a conical, outwardly tapering surface on a bone, especially on a cylindrically-worked femur head of a human hip joint, comprising:
- a drive shaft, said drive shaft having a free end and a longitudinal axis;
a knife-type cutting means being arranged at said free end of the drive shaft, said cutting means having an inner edge; and
adjusting means for moving said inner cutting edge of said cutting means from an initial position essentially parallel to the longitudinal axis of the drive shaft, the cutting edge being radially outwardly offset relative to the longitudinal axis of the drive shaft, to a position forming an acute angle relative to the longitudinal axis;
wherein, in the initial position, the extent of radial offsetting is at least as great as half the diameter (r) of the bone section to be treated.
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Abstract
An apparatus for producing a conical, outwardly tapering surface on a bone, especially on a cylindrically pre-worked femur head of a human hip joint. The apparatus includes a drive shaft having a free end. A knife-type cutting device is arranged at the free end of the drive shaft, wherein the cutting device has an inner edge. An adjusting device is included for moving the inner cutting edge of the cutting device from an initial position essentially parallel to the longitudinal axis of the drive shaft to a position forming an acute angle relative to the longitudinal axis. The cutting edge of the cutting device is radially outwardly offset relative to the longitudinal axis of the drive shaft. In the initial position, the extent of radial offsetting is at least as great as half the diameter(r) of the bone section to be treated.
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Citations
18 Claims
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1. An apparatus for producing a conical, outwardly tapering surface on a bone, especially on a cylindrically-worked femur head of a human hip joint, comprising:
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a drive shaft, said drive shaft having a free end and a longitudinal axis; a knife-type cutting means being arranged at said free end of the drive shaft, said cutting means having an inner edge; and adjusting means for moving said inner cutting edge of said cutting means from an initial position essentially parallel to the longitudinal axis of the drive shaft, the cutting edge being radially outwardly offset relative to the longitudinal axis of the drive shaft, to a position forming an acute angle relative to the longitudinal axis; wherein, in the initial position, the extent of radial offsetting is at least as great as half the diameter (r) of the bone section to be treated. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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Specification