Surgery – Instruments – Orthopedic instrumentation
Patent
1997-09-18
2000-10-24
Buiz, Michael
Surgery
Instruments
Orthopedic instrumentation
600 60, A61B 1756
Patent
active
061360007
DESCRIPTION:
BRIEF SUMMARY
This invention relates to an anchoring device for posterior vertebral osteosynthesis.
The technical field of the invention is the domain of the manufacture of osteosynthesis implants intended for the vertebral column of man or of an animal.
When it is desirable to stabilize or to fix two or several vertebrae to one another and/or to reduce deformations of the vertebral column (such as cyphosis or scoliosis), it is known to use longitudinal metal devices that bridge several vertebrae, for example with plates or rods, and onto which are anchored other metal fixing elements such as screws.
Various patent applications have been made, in particular for different vertebral osteosynthesis systems, such as, for example application No. FR 2 716 794, published Sep. 8th, 1995 and applied for by the American company SOFAMOR (Inventor: Mr. STEIB) for a "Connector for the implementation of rachidian osteosynthesis intended for lumbar or sacral or iliosacral fixing" or the application No. FR 2 712 486 published May 24th, 1995 by Messrs. BRESLAV, CATON etc . . . for an "Intervertebral prosthesis" or the application No. FR 2 697 874, published May 13th, 1994 by the Societe de Fabrication de Materiel Orthopedique (Inventor: Mr. COTREL) entitled "A connecting device for a long thin element and for a support for this element".
Other older applications can also be mentioned, such as the application No. FR 2 672 202 published Aug. 7th, 1992, by the company SAFIR (Inventors Mr GRAF et al.) for a "Surgical bone implant, notably for an intervertebral stabilizer" or the application No. FR 2 651 992, published Mar. 22nd, 1991 by the Societe de Fabrication de Materiel Orthopedique (Inventor: Mr. LAURAIN) for "An implant for anterior dorso-lumbar rachidian osteosynthesis, intended for the correction of cyphosis".
All these systems, like many others, too numerous to mention here, essentially use for their fixing onto the vertebrae, screws that require tapping into the bony parts, which is rather delicate and is in any case at the expense of bone fragility. There are also systems based on hooks or on strapping around the blade, spinal, transverse or articular (but never isthmic) regions of each vertebra, but these regions, considered to be rather fragile, do not alone allow large correction torques to be applied.
Hence the problem posed is to be able to produce vertebral osteosynthesis systems while using anchoring devices which are not screwed into the vertebrae but are fixed sufficiently rigidly to them to allow large correction torques to be applied without weakening or risking damage to said vertebrae.
A solution to the problem posed is an anchoring device for posterior vertebral osteosynthesis that comprises at least four fixing points, each constituted by a hook, the hooks being opposed to one another, two by two, along two perpendicular axes XX'/ZZ' and each pair of hooks thereby set up, forming a clamp, the one considered to be along the lateral axis XX' referred to as isthmic and the other axial one ZZ' referred to as laminar; said hooks are rigidly attached to supports that connect them to one and the same central body, preferably a single solid block and the ends of these hooks are of a width of at least 5 millimeters.
The central body receives a fixing means immobilising on itself any means of connecting with at least one other anchoring device, such as at least one rod; the fixing means for this can then be a collar that straddles it and immobilizes it on said central body by clamping.
In one preferred embodiment, each support of each of said hooks or each pair defined above is slidably mounted with respect to said central body and is adjustable along the axes ZZ'/XX' which allows them to be brought closer together or moved further apart, said hook supports sliding within said central body being able to be immobilized within it by any means going through said central body, such as, for example locking screws.
Such a system deals very well with the problem posed by, in effect allowing an anchorage on each posterior arc of th
REFERENCES:
patent: 4257409 (1981-03-01), Bacal et al.
patent: 5116334 (1992-05-01), Cozad et al.
Louis Christian
Louis Rene
Bui Vy Q.
Buiz Michael
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