Surgery – Instruments – Orthopedic instrumentation
Patent
1996-02-27
1998-01-06
Buiz, Michael
Surgery
Instruments
Orthopedic instrumentation
606 90, 606102, A61B 1756
Patent
active
057049378
DESCRIPTION:
BRIEF SUMMARY
The invention concerns operative equipment for fixing implanted spinal instrumentation such as an osteosynthetic device, an intervertebral device for the treatment of instabilities or an implanted dynamic corrective orthosis, or other such.
BACKGROUND AND OBJECTS OF THE INVENTION
Spinal osteosynthetic devices are already known enabling scoliotic deformities to be treated, consisting of components for anchoring to the vertebrae, such as hooks or intrapedicular screws, and rods or frames fixed to the anchoring components to impose a relative position on the different vertebrae. These rigid or semi-rigid osteosynthetic devices rigidify the spinal column in the corrected position and are always associated with a bone graft and an arthrodesis of the vertebrae.
These known osteosynthetic devices still present many problems as regards the fitting and reliability of the anchoring components which withstand high stresses, taking into account the subsequent rigidity, during attachment of rods, plates or frames to the anchoring components which must be achieved simultaneously for reducing deformity.
Thus, the reduction of deformity when an osteosynthetic device is put into position still presents problems. In point of fact it must be possible to carry out this reduction in deformity at the same time as, and by the attachment of vertebral instrumentation, and this in three dimensions. In particular, with a scoliosis, it is advisable not only to replace the vertebrae in the same sagittal plane, but also to re-establish the kyphosis and/or lordosis while carrying out a deroration of the vertebrae. Osteosynthetic devices of the Cotrel-Dubousset type enable this problem to be partially resolved. They consist of two posterior bilateral rods, arched during the operation, immediately before their attachment to the anchoring components, in relation to the lateral deviation, then turned through 90.degree. to place their curvature in a sagittal plane in order to re-establish the kyphosis or lordosis at least partially and to carry out a derotation of the vertebrae. The correction is limited by the fact that it is carried out only by the rod of the concavity which is first turned and then attached to the anchoring components. The rod placed in the convexity is modelled on the correction obtained and only has a stabilizing effect when inserted. The two rods are then connected to each other by transverse tensioning devices stabilizing the assembly in position. Nevertheless, the curvature of the rods determined essentially in relation to the lateral deviation to be corrected, does not necessarily correspond to an appropriate correction of the kyphosis or the lordosis. In addition, these devices are considered as among the most sophisticated and most rigid. The result is that their positioning remains difficult from the fact in particular of the instability of the hooks during corrective manoeuvres.
Apart from Cotrel-Dubousset devices, two other types of osteosynthetic devices are essentially used to treat deformities of the vertebral column. These consist on the one hand of Roy-Camille devices with plates and pedicular screws and their improvements, and on the other hand, of Luque or Dove devices with sub-lamina wires and their improvements. Roy-Camille devices are reserved for corrections with small amplitudes concerning a limited number of vertebrae, and do not permit effective derotation. Luque or Dove devices may cause serious neurological complications taking into account the passage of wires under the vertebral laminae in proximity to the spinal cord. All these devices do not provide a solution for the reduction of deformity which is any more satisfactory.
Intervertebral elastic devices are also known enabling degenerative lumbar instabilities to be treated. These devices generally consist of intervertebral ligaments or springs, sometimes accompanied by spacers interposed between the spinal processes or between intrapedicular screws. These ligaments or springs exert tensile forces tending to bring the vertebrae together an
REFERENCES:
patent: 3486505 (1969-12-01), Morrison
patent: 3865105 (1975-02-01), Lode
patent: 3977397 (1976-08-01), Kalnberz et al.
patent: 4066082 (1978-01-01), Arcan et al.
patent: 4078559 (1978-03-01), Nissinen
patent: 4271836 (1981-06-01), Bacal et al.
patent: 4289123 (1981-09-01), Dunn
patent: 4386603 (1983-06-01), Mayfield
patent: 4445513 (1984-05-01), Ulrich et al.
patent: 4448191 (1984-05-01), Rodnyansky et al.
patent: 4611582 (1986-09-01), Duff
patent: 4836196 (1989-06-01), Park et al.
patent: 4854496 (1989-08-01), Bugle
patent: 4898161 (1990-02-01), Grundei
patent: 4946458 (1990-08-01), Harms et al.
patent: 4964400 (1990-10-01), Laico et al.
patent: 5122130 (1992-06-01), Keller
patent: 5122145 (1992-06-01), Fishbane
patent: 5219349 (1993-06-01), Krag et al.
patent: 5281223 (1994-01-01), Ray
Buiz Michael
Dutton, Jr. Harold H.
Fairant Paulette
Woo Julian W.
LandOfFree
Operative equipment for fixing spinal instrumentation does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Operative equipment for fixing spinal instrumentation, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Operative equipment for fixing spinal instrumentation will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2324713