Surgery – Instruments – Orthopedic instrumentation
Patent
1994-10-11
1998-01-06
Buiz, Michael
Surgery
Instruments
Orthopedic instrumentation
606 60, 606 69, 606 72, A61B 1756
Patent
active
057049360
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The subject of the present invention is a spinal osteosynthesis device intended for treating scolioses, tumors, fractures and degenerative pathologies.
BACKGROUND OF THE INVENTION
Spinal osteosynthesis is currently carried out principally by devices using plates or rigid rods.
By way of example, mention may be made of: Steffee plates, the WILTSE technique, the Roy Camille centipede, the CD technique, the Texas Scottish Right Hospital technique (TSRH).
These devices generally pose problems in fitting the plates or rods on the bone anchoring implants. In fact, since the positioning of these anchorings is neither straight nor has the same orientation in the sagittal plane, especially as regards vertebral screws, it is necessary to place the plates or the rods forcibly, which is prejudicial to good holding of the anchorings, or alternatively to shape the rods, for example in order to make it possible to fix the anchoring elements.
With these devices, reduction is often difficult in that it is necessary to reduce at the same time as the bone anchorings are fixed to the plates or to the rods. This reduction is difficult to carry out flexibly.
In addition, the rods or the plates must generally be curved before fitting them on the bone anchoring elements, which limits optimization of the reduction.
In the opinion of numerous surgeons, excessive rigidity of the instruments has a detrimental effect on the rapidity of bone consolidation of the graft associated with spinal osteosynthesis.
SUMMARY OF THE INVENTION
The object of the invention is to provide a segmental-fixation osteosynthesis device which can be used posterially, bilaterally and anterially, arranged so as:
to facilitate the fitting of the implants by virtue of the flexibility of the longitudinal linkages which adapt to any positioning of the anchoring elements;
to make it possible to refine the reduction by a simple movement apart or together and to rigidify the progressive mounting segment by segment;
to preserve sufficient elasticity so as to promote bone fusion of the graft associated with osteosynthesis;
to obtain instrumentation with reduced bulk.
According to the invention, the bone anchoring element for a spinal osteosynthesis device comprises a vertebral anchoring part, a cylindrical body in which are made at least two longitudinal slots, together defining at least two branches, as well as an internal screw thread, and an internal expansion screw, designed to be capable of being screwed inside the body while causing radial expansion of the branches.
The spinal osteosynthesis device according to the invention includes:
bone anchoring elements having the characteristics of the aforementioned anchoring element, connectors designed to be capable of being solidly attached to the corresponding anchoring elements, and flexible longitudinal rods with high elastic limit, passing through the connectors, means being provided for fixing these rods to the connectors.
The flexible rods are of circular or non-circular cross section, for example oblong, and are manufactured from biocompatible material with high elastic limit and high breaking strength. In addition, these flexible rods may be solid rods or alternatively assemblies of filaments such as, for example, strands.
It will be understood that such a spinal bracing device preserves a certain elasticity in the arthrodesed region, by virtue of the use of flexible metal rods with high elastic limit, which pass through a suitable number of connectors which are themselves solidly anchored to the vertebrae by elements such as screws and hooks.
The metal rods are of small cross section with respect to the rods of posterior instrumentation hitherto used, and have suitable inertia for giving the osteosynthesis the elasticity which is suitable for good bone grafting.
According to other characteristics of the invention:
each connector comprises a base in which are made two bores through which corresponding flexible rods pass, as well as a hole for receiving the expansible body of an anch
REFERENCES:
patent: 3604414 (1971-09-01), Borges
patent: 4041939 (1977-08-01), Hall
patent: 4047524 (1977-09-01), Hall
patent: 5030220 (1991-07-01), Howland
patent: 5053034 (1991-10-01), Olerud
patent: 5057109 (1991-10-01), Olerud
patent: 5147360 (1992-09-01), Dubousset
patent: 5300073 (1994-04-01), Ray et al.
patent: 5417690 (1995-05-01), Sennett et al.
Buiz Michael
Eurosurgical
Leonardo Mark S.
LandOfFree
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