Cervical Intervertebral Disc Prosthesis Comprising An Anti-Dislocation Device And Instruments
3 Assignments
0 Petitions
Accused Products
Abstract
A cervical intervertebral prosthesis includes lower and upper anchoring plates with a prosthesis core arranged between them to create an articulated connection. The anchoring plates are designed to bear with their anchoring plate surfaces on adjacent vertebral bodies. At least one anchoring plate surface has a rib-like projection thereon which can be used to engage in the vertebral body with a form fit. In order to produce a corresponding recess in the vertebral body, an instrument having a handle, a stem, a head part and an excavating element that can be retracted into the head part may be used. This permits considerably improved securing of the cervical intervertebral prosthesis against unintended movement. The medullary canal running along the posterior margin of the vertebral column is in this way protected from damage.
251 Citations
45 Claims
-
1-22. -22. (canceled)
- 23. An instrument for implanting a cervical intervertebral prosthesis including two anchoring plates and a prosthesis core arranged between them, the instrument comprising a handle, a stem, and a head part which is arranged at an end of the instrument remote from the handle and whose dimensions are chosen such that the head part can be inserted into an implantation space that has been created between adjacent vertebral bodies for receiving the intervertebral prosthesis, the head part comprising an excavating element configured for creating a recess in a cranial-caudal direction in the adjacent vertebral bodies and an actuating device provided for the excavating element which is movable between a rest position, in which the actuating device is retracted in the head part, and a working position, in which the actuating device protrudes from the head part transversely with respect to the stem.
-
35. A cervical intervertebral prosthesis, comprising a lower anchoring plate and an upper anchoring plate, each of which has an anchoring plate surface for bearing on an adjacent vertebral body, and a prosthesis core arranged between the lower and upper anchoring plates which creates an articulated connection between the anchoring plates,
wherein at least one of the two anchoring plate surfaces comprises a projection configured for a form-fit engagement in the vertebral body transverse to an anterior-posterior direction relative to its location of implantation.
-
43. A method for implanting a cervical intervertebral prosthesis comprising two cover plates with a prosthesis core arranged therebetween, the method comprising:
-
a) spreading two adjacent vertebral bodies apart, b) working end faces of the vertebral bodies to create a seat for the cover plates, c) using an instrument with a head part and an excavating element which can emerge from the excavating element in a cranial-caudal direction to create a recess in the cranial-caudal direction in at least one end face of the adjacent vertebral bodies, d) removing the instrument and inserting the intervertebral prosthesis which, on at least one surface of the cover plates directed toward the vertebral body, has a projection engaging in the recess. - View Dependent Claims (44, 45)
-
Specification