Osteosynthesis device

Claim 2

An osteosynthesis device with a bone screw that has a screw shank and a screw head in the form of a forked head, where the forked head has a groove running crosswise to the screw axis, and a corrective rod to be inserted into the groove of the forked head, where the forked head is provided with means for fixing the corrective rod, and the forked head has an axial opening and at least a partially spherical head of the screw shank is inserted moveably into the opening, the opening narrowing in its region facing the screw shank and the narrowest cross section of the narrowing is smaller than the diameter of the head of the screw shank, the corrective rod being seated on the upper end of the head of the screw shank, characterized in that the narrowing is in the form of a truncated hollow cone and the corrective rod deforms the head of the screw shank when the means fixing the corrective rod is drawn tight.

Claim 3

The osteosynthesis device according to claim 1 , characterized in that a center of the head of the screw shank lies inside of the narrowing.

Claim 4

The osteosynthesis device according to claim 1 , characterized in that the hollow cone has a cone angle of 2°-15°.

Claim 5

The osteosynthesis device according to claim 1 , characterized in that the opening is broadened at an open end facing the screw shank.

Claim 6

A bone screw for an osteosynthesis device according to claim 1 , in which the head of the screw shank projects over the bottom of the groove.

Claim 7

The osteosynthesis device according to claim 1 characterized in that the hollow cone has a cone angle of 8°.

Claim 8

The osteosynthesis device according to claim 1 characterized in that the opening is stepped broadened at an open end facing the screw shank.

Claim 9

The osteosynthesis device of claim 1 further comprising: at least one flute disposed at a bottom of the groove to engage the corrective rod.

Claim 10

The osteosynthesis device of claim 1 wherein the head of the screw shank is directly engageable with the opening along a circular periphery of the head of the screw shank.

Claim 11

The osteosynthesis device according to claim 1 , characterized in that the forked head is provided with an increased wall thickness in the region of the hollow cone-like opening.

Claim 12

The osteosynthesis device according to claim 10 , characterized in that the corrective rod has a surface profile the longitudinal direction and the forked head has a surface profiling in the bottom of the groove or channel.

Claim 13

An osteosynthesis device with a bone screw that has a screw shank and a screw head in the form of a forked head, where the forked head has a groove running crosswise to the screw axis, and a corrective rod to be inserted into the groove of the forked head, where the forked head is provided with means for fixing the corrective rod, and the forked head has an axial opening and at least a partially spherical head of the screw shank is inserted moveably into the opening, the opening narrowing in its region facing the screw shank and the narrowest cross section of the narrowing is smaller than the diameter of the head of the screw shank, the corrective rod being seated on the upper end of the head of the screw shank, characterized in that the narrowing is in the form of a truncated hollow cone and the corrective rod deforms the head of the screw shank when the means fixing the corrective rod is drawn tight and the head of the screw shank is directly engageable with the opening along a circular periphery of the head of the screw shank.

Claim 14

An osteosynthesis device with a bone screw that has a screw shank and a screw head in the form of a forked head, where the forked head has a groove running crosswise to the screw axis, and a corrective rod to be inserted into the groove of the forked head, where the forked head is provided with means for fixing the corrective rod, and the forked head has an axial opening and at least a partially spherical head of the screw shank is inserted moveably into the opening, the opening narrowing in its region facing the screw shank and the narrowest cross section of the narrowing is smaller than the diameter of the head of the screw shank, the corrective rod being seated on the upper end of the head of the screw shank, characterized in that the narrowing is in the form of a truncated hollow cone and the corrective rod deforms the head of the screw shank when the means fixing the corrective rod is drawn tight and the head of the screw shank is directly engageable with the opening along a circular periphery of the head of the screw shank.

Claim 15

The osteosynthesis device of claim 12 wherein the opening further comprises: a broadening portion adjacent the narrowest cross section; and a shoulder defined between the narrowest cross section and the broadening portion.

Claim 16

The osteosynthesis device of claim 12 further comprising: a plurality of flutes disposed along a bottom of the groove wherein each flute extends longitudinally along the groove.

Claim 17

The osteosynthesis device of claim 12 wherein the opening defines a frusto-conical surface disposed at angle of eight degrees.

Claim 18

The osteosynthesis device of claim 12 wherein at least a portion of the head of the screw shank extends through the opening.

Claim 19

An osteosynthesis device with a bone screw that has a screw shank and a screw head in the form of a forked head, where the forked head has a groove running crosswise to the screw axis, and a corrective rod to be inserted into the groove of the forked head, where the forked head is provided with means for fixing the corrective rod, and the forked head has an axial opening and at least a partially spherical head of the screw shank is inserted moveably into the opening, the opening narrowing in its region facing the screw shank and the narrowest cross section of the narrowing is smaller than the diameter of the head of the screw shank, the opening also including a stepped broadened portion adjacent the narrowest cross section, the corrective rod being seated on the upper end of the head of the screw shank, characterized in that the narrowing is in the form of a truncated hollow cone and the corrective rod deforms the head of the screw shank when the means fixing the corrective rod is drawn tight and the head of the screw shank is directly engageable with the opening along a circular periphery of the head of the screw shank.

Claim 20

An osteosynthesis device with a bone screw that has a screw shank and a screw head in the form of a forked head, where the forked head has a groove running crosswise to the screw axis, and a corrective rod to be inserted into the groove of the forked head, where the forked head is provided with means for fixing the corrective rod, and the forked head has an axial opening and at least a partially spherical head of the screw shank is inserted moveably into the opening, the opening narrowing in its region facing the screw shank and the narrowest cross section of the narrowing is smaller than the diameter of the head of the screw shank, the opening also including a stepped broadened portion adjacent the narrowest cross section, the corrective rod being seated on the upper end of the head of the screw shank, characterized in that the narrowing is in the form of a truncated hollow cone and the corrective rod deforms the head of the screw shank when the means fixing the corrective rod is drawn tight and the head of the screw shank is directly engageable with the opening along a circular periphery of the head of the screw shank.

Claim 21

The osteosynthesis device of claim 17 further comprising: a plurality of flutes disposed along a bottom of the groove wherein each flute extends longitudinally along the groove for engaging the connecting rod.

Claim 22

The osteosynthesis device of claim 18 characterized in that a center of the head of the screw shank is disposed in the opening.

Claim 23

The osteosynthesis device of claim 19 characterized in that the hollow cone has a cone angle of between two degrees and fifteen degrees.