Surgery – Instruments – Orthopedic instrumentation
Patent
1998-02-23
1999-09-14
Tucker, Guy V.
Surgery
Instruments
Orthopedic instrumentation
A61B 1770
Patent
active
059515554
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The invention relates to the device for the correction of spinal deformities based on metal implants applied by an operation.
BACKGROUND ART
Under the term of the spine deformity are herein understood scolioses (abnormal curvatures of the spine in the sagital plane) and pathological kyphoses and lordoses (abnormal curvatures in the sagital plane). The operative correction of spine deformities by means of metal implants made of special stainless biocompatible steels and titanium alloys, represents the most effective manner of medical treatment of spine deformities and at the same time, a medico-technical problem which is being actual practically already one century, and which still has not been solved with satisfaction. Actually are known several principal constructive solutions for implants to treat spine deformities but each of them has, in addition to certain advantages, also a series of insufficiences. The whole set of known solutions may be divided into three basic groups which may be characterized in the following manner.
The first group represents a set of solutions which may be characterized as rigid systems. A significant feature of these systems is that they contain at least one rod or a plate which is introduced by an operation on the place of a spine deformity, almost in parallel with the spine, while in its whole lenght it is connected with at least two spinal vertebrae by various shaped fixing elements (hooks, clamps, screws, wire knots, etc) installed on it which are fixed on the body or the processus or the laminae of vertebrae. Usually two rods are used which are mutually in at least two spots interconnected and operationally installed along the sides of the spine while several or all vertebrae are then connected with them in its deformity place. From the functional point of view occurs the correction of the deformity by acting, regarding the long spinal axis, of cross tensile and/or pressure forces on deformed vertebrae while is made use of the rigidity of the rod or rods. These systems usually well correct and also stabilize the spine in all three planes but they do not allow the motion and the growth of stabilized segments. Therefore, when applying them, the joints are abolished by an operation and by putting on bone grafts will be evoked that the spine will grow together (spondylodesis, fusion) in the deformity place and that will locally prevent its growth and the mobility will be annulled. Presently, it is possible to insert here as representatives, for instance, of the Wisconsin instrumentations Y., Dubousset J., Rev. Chir. Orthop., 70, 1984, 489-495; Cotrel Y., Dubousset J., Orthop. Trans., 9, 1985, 118!, TSRH, the Isola system using System: Principles and Practice, acroMed, Cleveland, 1991!, Orthop. Trans., 1, 1977, 136; Luque E. R.: Tailoring Surgery to Spinal Pathology. In Segmental Spinal Instrumentation. Thorofare, N.J., Slack Co., 1984! and others. This group may include also internal fixators (e.g. Socon (Socon-Fixateur Interne-Aesculap, Prospekt N. C-627 1091(3, acc. to Matzen, Ulrich, Dr. HS (de Apr. 16, 1992 derer/e-matzen.pm.3! and others).
The second group is represented by systems which may be characterized as semirigid ones. For these instrumentations is typical that, they are made of: elements, which is by an operation applied from the concave or convex side of the deformity, and the fixing elements are fixed, under the actual maximum possible straightness of the spine deformity, on vertebrae in the area of the beginning and the end of a deformity, while from the functional point of view the correction of a deformity occurs by acting parallel expanding forces with the long spinal axis on its concave side or by acting pressing forces on its convex side; and which is applied by an operation from the convex side of the deformity, and the fixing elements are at actual tension of the spring fixed on vertebrae in the area of the beginning and the end of the deformity while from the functional point of view the correction of the deformity occurs by acting
REFERENCES:
patent: 5672175 (1997-09-01), Martin
patent: 5720746 (1998-02-01), Soubeiran
patent: 5733284 (1998-03-01), Martin
Cech Josef
Rehak Lubos
Svrcek Daniel
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