Bone plate with conical holes
First Claim
Patent Images
1. An osteosynthesis device comprising:
- a plate with a top face and a bottom face located opposite said top face and directed towards a bone, said plate having a plurality of conical screw holes each of which has a diameter (Do) at the top face of the plate which is larger than a coaxial diameter (Du) at the bottom plate face thus forming a tapered wall therebetween; and
a plurality of screws which can be screwed into the bone through said screw holes, each screw having an at least a partially spherical rounded head which rests against said screw hole wall along an annular contact surface, wherein when the axis of the screw is aligned with the axis of said hole, said contact surface is closer to the top face of the plate than to the bottom face thereof.
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Abstract
An osteosynthesis device comprises a plate and screws which are screwed into bone through holes in the plate. The diameters of the holes at the top face of the plate are larger than at the bottom face of the plate. The screws have a spherical head which, when screwed in rests snugly against the wall of the screw hole with an annular contact surface. Both when the screw is located perpendicularly with respect to the plate and when located at an angle with respect to the plate, the contact surface is located above the center line of the hole depth.
202 Citations
12 Claims
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1. An osteosynthesis device comprising:
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a plate with a top face and a bottom face located opposite said top face and directed towards a bone, said plate having a plurality of conical screw holes each of which has a diameter (Do) at the top face of the plate which is larger than a coaxial diameter (Du) at the bottom plate face thus forming a tapered wall therebetween; and a plurality of screws which can be screwed into the bone through said screw holes, each screw having an at least a partially spherical rounded head which rests against said screw hole wall along an annular contact surface, wherein when the axis of the screw is aligned with the axis of said hole, said contact surface is closer to the top face of the plate than to the bottom face thereof. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An osteosynthesis device comprising:
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a plate having a top face, a bottom face and a plurality of screw holes therein, said screw holes being in the form of a cone tapering from a larger diameter at said top face to a smaller diameter at said bottom face; and a screw having at least a part spherical head with a diameter greater than a diameter of said cone at a midpoint between said top and bottom faces of said plate. - View Dependent Claims (11, 12)
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Specification