Vertebral cage device with modular fixation

Abstract

The present invention concerns a modular arthrodesis device, used to enable fusing of two contiguous vertebrae by development of bony tissues with replacement of fibrocartilaginous discs ensuring the bonding between the vertebrae of the vertebral column or the end of the latter, and including interchangeable types of fixation means. Intervertebral arthrodesis device designed to be inserted in an intervertebral space (E) separating the opposite plates (V0) of two adjacent vertebrae (V), characterised in that it comprises at least one structure called intervertebral cage (1) presenting the shape of a ring that mayor may not be open, in which at least one part, along the axis of the spine, has a lower height that the rest of this same cage and forms a small bar (12) crossed by at least one drilling (121, 122) of the axis approximately perpendicular to the plate (V0) of at least one of the adjacent vertebrae (V).

Description

[0001] This patent application is a divisional application of another patent application, and the national application number of the other patent application (parent application) is: 02814069.9; the international filing date is: July 12, 2002; the title of the invention is: "has Modular Fixed Spinal Frame Device". technical field [0002] The present invention relates to an arthrodesis device for the fusion of two adjacent vertebral bodies by replacing the fibrocartilaginous disc with growth of bone tissue, ensuring the union between the vertebral bodies of the spine or the ends of the latter. Background technique [0003] The intervertebral disc is formed from a deformable but incompressible portion called the "nucleus" which contains about 80% water and is surrounded by layers of elastic fibers that bind together to Holds the nucleus, absorbs some of the force applied to the disc unit and keeps the joint stable. These parts may often degenerate due to crushing, dislocatio...

AI Technical Summary

Problems solved by technology

However, such a plate exhibits overcrowding outside the intervertebral space, which can sometimes cause problems, especially in the case of cervical joints, where the space available is very limited

In fact, when positioning another cage with a disc on one of the immediately adjacent discs, the presence of this disc may, for example, cause daily discomfort to the patient or constitute an immediate or future hindrance

[0008] Also, especially in the case of the cervical spine, movement of the spine often has a tendency to loosen the bone anchoring screws, which reduces the effectiveness of such discs and may also cause damage to the tissue surrounding said discs

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