Instrument system for the operative correction of vertebral displacements
First Claim
1. A correction and support device which has substantially the same outside diameter and pitch of an outside through-going thread as a predetermined perforated cylinder implant and which is intended to be introduced in its axial direction into a threaded hole in an intervertebral disc space of two neighbouring vertebrae, comprises an upper and a lower carrier part which both are provided for anchoring in the bordering vertebral bodies;
- whereby the upper and lower carrier parts are guided in a form-fitted manner with respect to one another in the axial direction for displacing one vertebra respectively to the other vertebra in axial direction; and
whereby an integrated setting member consists of a setting screw which extends in the axial direction of the correction and support device, which is rotationally and axially fixedly journalled in the lower carrier part and which is in thread engagement with the upper carrier part, wherein the axial length of the upper carrier part, which is driven by the setting screw, is less than the axial length of the lower carrier part for enabling an axial displacement in both directions.
2 Assignments
0 Petitions
Accused Products
Abstract
An instrument system for the operative correction of vertebral displacements and for the stabilizing of repositioned vertebral bodies is described which is characterized by correction and support devices which are formed in two parts and which are displaceable in the axial direction guided relative to one another by means of an integrated setting member, as well as by interim spacers which are adapted in their spacer dimensions to the respective correction and support devices and by perforated hollow cylinder implants which are provided with outwardly lying fixing members and which are replaceable by the correction and support devices in repositioned vertebral bodies.
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Citations
12 Claims
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1. A correction and support device which has substantially the same outside diameter and pitch of an outside through-going thread as a predetermined perforated cylinder implant and which is intended to be introduced in its axial direction into a threaded hole in an intervertebral disc space of two neighbouring vertebrae, comprises an upper and a lower carrier part which both are provided for anchoring in the bordering vertebral bodies;
- whereby the upper and lower carrier parts are guided in a form-fitted manner with respect to one another in the axial direction for displacing one vertebra respectively to the other vertebra in axial direction; and
whereby an integrated setting member consists of a setting screw which extends in the axial direction of the correction and support device, which is rotationally and axially fixedly journalled in the lower carrier part and which is in thread engagement with the upper carrier part, wherein the axial length of the upper carrier part, which is driven by the setting screw, is less than the axial length of the lower carrier part for enabling an axial displacement in both directions. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
- whereby the upper and lower carrier parts are guided in a form-fitted manner with respect to one another in the axial direction for displacing one vertebra respectively to the other vertebra in axial direction; and
Specification