Surgery – Instruments – Orthopedic instrumentation
Patent
1994-09-19
1996-05-07
Pellegrino, Stephen C.
Surgery
Instruments
Orthopedic instrumentation
606 60, A61B 1770, A61B 1768
Patent
active
055141323
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a spinal osteosynthesis device for supporting, straightening and fixing the spine, comprising implants anchored on the vertebrae, at least one connecting bar for supporting said implants and removable elements for locking the implants onto the bars.
Surgical treatment of deformations and instabilities of the vertebral spine has been developed in the last three decades. This kind of surgery is unquestionably necessary in the case of some frequent diseases as for instance scoliosis. Several facts, however, have limited its development for a long time. Such facts are e.g. as follows: diseases, spine have not been correct, implantation were not developed.
The most important event in the field of the development of that kind of surgery was the commercial introduction of the so called Harrington devices which are slightly out of date in view of the important advance in the field of biomechanics of the prostheses and the fact that, recently, the spinal surgery of the above diseases consists of obtaining a postolateral arthrodesis (with the exception of several methods as e.g. ligament replacement or vertebral disc prostheses not very much developed so far).
SUMMARY OF THE INVENTION
An object of the present invention is therefore to provide an improvement in devices of the above-outlined type and to offer a solution for adjustment of the implants in spinal surgery as well as an inspiration for the detailed analysis of the formation and the character of the curvature scoliosis.
A further object of the invention is to eliminate the difficulties connected with the devices applied currently and to provide a device which is simple to produce as well as to implant, which can efficiently be corrected during implantation without the need of introducing the implants in the spinal channel and which enables the change of surgical orientation by correcting the deformations. The mobility of a part of the spine is sacrificed only to an extent which depends on the degree of the deformation. The device should also enable anchoring or fixing the implants within the costotransversal space, above the dorsal part in order to obtain an inclination, rotation, a forward pull or backward push with respect to the vertebrae as well as compression or distraction within the correct axis of the spine and anchoring within the proper upper and lower limits.
These objects and others to become apparent as the specification progresses, are accomplished by the invention, according to which, briefly stated, the spinal osteosynthesis device includes a plurality of implants, each having a yoke and an anchoring arrangement carried by the yoke for securing the implant to a selected vertebra. The device further has a connecting bar crossing each yoke; and a plurality of clamps tightening the bar to each yoke. Each clamp has a clamp body; and a pair of generally parallel-oriented claws spaced from one another by a slot and extending from the clamp body. The claws partially surround the respective yoke. The clamp body carries a tightening arrangement for rocking the clamp body about the connecting bar to tilt the claws toward the connecting bar so that the yoke is clamped thereagainst.
In order to achieve a proper straightening and support of the spine, the implants are provided with: and
The yokes connecting the hooks are embracing the curvature of the vertebrae and preventing rotation with respect to the bars by opposite flattenings (flat parts).
According to a preferred embodiment, the threaded bore with the adjusting screw for tilting the clamp is arranged backwardly at an angle of about 25.degree. and at a certain distance from the vertical plane of the claws of the clamp.
In order to improve the locking effect between the yoke connecting the hooks or eyes of the implants and the bars, the base of the clamp is prolonged on the side of the threaded bore receiving the adjusting and fixing screw.
The advantage obtained by the present invention is first of all that the device--similarly to t
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Derwent Publication, AN-76-H7053X, Dec. 1975, 1 page.
Csernatony Zoltan
Jeanson Jean-Francois
JBS S.A.
Markow Scott B.
Pellegrino Stephen C.
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