Surgery – Instruments – Orthopedic instrumentation
Patent
1999-06-28
2000-07-18
Buiz, Michael
Surgery
Instruments
Orthopedic instrumentation
606 90, A61B 1756
Patent
active
060901136
DESCRIPTION:
BRIEF SUMMARY
The invention relates to osteosynthesis systems for the spinal column and to positioning equipment for such systems.
Document FR-2 659 546 discloses an osteosynthesis system for a spinal column comprising several pedicle screws intended to be anchored in vertebrae of the spinal column and a linking rod designed to connect the pedicle screws rigidly together. Such a system is used particularly in the event of a simple or multiple fracture of one or more vertebrae of the spinal column. The fracture may have various configurations and entail corrective movements in order to recover the original morphology of the spine, particularly as far as the lordosis or cyphosis curvatures are concerned. To achieve this, each pedicle screw comprises a spherical collar slipped onto the rod so that it can slide and housed in a recess in the head of the pedicle screw while at the same time being free to move in this recess. Once the screws have been anchored into the vertebrae, each pedicle screw can therefore be placed in any position whatever along the rod, and at any orientation whatever with respect to the rod. The head of the screw comprises a locking member that allows the screw, the collar and the rod to be rigidly immobilized with respect to each other so as to rigidly fix the screw to the rod in the desired position. This system therefore allows the pedicle screws to be slid as desired relative to one another (distraction movement) and orientated relative to one another (angular correction) so as to return the vertebrae to the desired position for osteosynthesis before the screws are rigidly fixed to the rod. However, this system which makes the distraction movements of the pedicle screws easy, does not allow for easy and precise adjustment of the mutual separation and mutual angular orientation of the pedicle screws.
Document DE 91/12466 discloses positioning equipment for an osteosynthesis device. This equipment comprises two arms designed to be attached to two pedicle screws in such a way as to form extensions thereof. It also comprises an arm linking member extending from one of the arms to the other. This member has two threaded rods collaborating with the arms through screw-nut links. Manipulation of the linking member allows the distance between the arms to be varied and, by collaboration with the screw linking member, allows the relative inclination of the screws to be varied. However, this device has the drawback that manipulating the threaded member is a relatively lengthy process, particularly when there is a desire to produce a large variation in the distance between the arms. Furthermore, this lengthy manipulation requires the operator to perform numerous operations on the equipment, particularly repetitive turns of the arm linking member. All these operations may induce stresses which are transmitted as far as the vertebrae.
One object of the invention is to provide equipment that allows the relative position of the arms to be varied more quickly while at the same time avoiding transmitting undesirable stresses to the vertebrae.
With a view to achieving this objective, the invention provides positioning equipment for an osteosynthesis system for a spinal column comprising two elongate anchoring members each designed to be anchored in a vertebra of the column, and an elongate anchoring linking element designed to connect the anchoring members together, the system being designed to have an unlocked configuration in which each anchoring member can turn with respect to the anchoring linking element about a first axis perpendicular to a longitudinal direction of the anchoring member and perpendicular to a longitudinal direction of the anchoring linking element, and a locked configuration in which each anchoring member is rigidly fixed to the anchoring linking element, the equipment comprising two arms designed to be fixed removably to the two respective anchoring members and an elongate arm linking element designed to connect part of each arm together, the arm linking element being designed to connect the a
REFERENCES:
patent: 5395370 (1995-03-01), Muller et al.
patent: 5849012 (1998-12-01), Abboudi
Conchy Frederic
Le Couedic Regis
Buiz Michael
Stryker France S.A.
Woo Julian W.
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