Prosthesis (i.e. – artificial body members) – parts thereof – or ai – Implantable prosthesis – Bone
Patent
1996-02-14
1997-12-30
Shay, Randy C.
Prosthesis (i.e., artificial body members), parts thereof, or ai
Implantable prosthesis
Bone
A61F 244
Patent
active
057024502
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to an internal prosthesis for human use designed to replace a deficient intervertebral disk in the lower back, and particularly in the lumbar and lumbar-sacral regions.
2. Description of the Related Art
The general basic concern in osteoarticular surgery is to repair lesions and possibly to prevent their aggravation, in order to preserve the two functions (the support function and the movement function) of osteo-articular structures whenever possible.
The most frequent reason for surgery on the spinal column at the present time is mechanical deterioration of intervertebral support structures, the most important of which is the intervertebral disk.
Evolution of this deterioration usually has two harmful consequences: itself; canal by mechanical compression, which causes peripheral deficiencies.
Vertebral surgery therefore attempts to satisfy three objectives in these cases: adversely affected.
With current surgical techniques, it is impossible to satisfy these three objectives using a single operating procedure, due to the specific anatomic configuration of the spinal column. lesions by a posterior surgical approach, in which case only palliative actions can be done on the intervertebral disk which will remain deficient, or the disk can be completely eliminated by fusing the vertebra by bone grafts which will provide support but which will permanently eliminate movement; disk by a mobile prosthesis is to use an anterior surgical approach in which it is usually impossible to satisfactorily treat posterior neurological lesions mentioned above at the same time.
Disk prostheses known at the present time provide total and single-piece disk replacement, which is technically only possible by an anterior approach.
Furthermore, current disk prostheses restrict movements and do not have all mechanical properties necessary to enable all desireable mobilities in the three planes in space and their combinations necessary for physiological functioning of an intervertebral stage.
The concept of making prostheses, for example disk prostheses containing a flexible insertion part placed between two rigid disks (patent FR-1,122,634) was introduced a few decades ago.
Furthermore, in order to avoid these disadvantages, Dr. Arthur D. STEFFEE, M.D., designed a prosthesis which had a mechanical structure capable of restoring support and all physiological disk movements at the same time (EP-0.392.076). This was a remarkable improvement.
However once again, this equipment can only be installed by an anterior surgical approach and is only designed for complete replacement of a disk as a single part. To our knowledge at the present time, this product has not been made available to surgeons.
SUMMARY OF THE INVENTION
The prosthesis according to the invention can remedy these disadvantages. Its appropriate structure, shape and dimensions are designed so that a half-disk can be replaced by a prosthetic part.
This makes it possible to achieve the three objectives mentioned above (restore the support function, restore the movement function and release neurological structures) in a single posterior surgical approach and in a single operation, possibly using two symmetrical prostheses in order to replace an entire disk.
Consequently, the invention relates to an intervertebral disk prosthesis designed to be placed in the disk space containing an upper rigid plate, a lower rigid plate, an elastic cushion placed between the upper plate and the lower plate, and comprising an upper face and a lower face, each being fixed to the corresponding plate.
The intervertebral disk prosthesis according to the invention comprises at least one prosthetic member, constituting a fraction of a disk, corresponding at most to half a disk.
In a preferred embodiment, it is formed of two disk fractions each forming a half-prosthesis.
This prosthesis can be inserted by a posterior approach through the spinal canal, which is a major advantage of the invention in surgical practice.
There is
REFERENCES:
patent: 3867728 (1975-02-01), Stubstad et al.
patent: 4772287 (1988-09-01), Ray et al.
patent: 4834757 (1989-05-01), Brantigan
patent: 5071437 (1991-12-01), Steffee
patent: 5458638 (1995-10-01), Kuslich et al.
patent: 5522899 (1996-06-01), Michelson
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