Surgery – Instruments – Orthopedic instrumentation
Patent
1994-07-15
1996-07-09
Jackson, Gary
Surgery
Instruments
Orthopedic instrumentation
606 71, A61B 1756
Patent
active
055340016
DESCRIPTION:
BRIEF SUMMARY
This Application has been filed as a continuation under rule 371 of PCT/CH 93,00118.
The invention refers to an osteosynthetic fixation element, particularly a pedicular screw or a vertebral column hook pursuant to the definition in claim 1 and a device for manipulating the osteosynthetic fixation element.
A fixation element of this type is already known from DE-U1 89.15.443.6, particularly for vertebral column surgery. It consists essentially of a lower portion that can be anchored to the bone, in the form of a screw shaft or a shaft and an upper body, connected thereto, for fastening to a rod, wherein in the body an upward channel opening is created that defines two lateral legs between which the rod can be accepted. The fixation of the rod inside the channel occurs through a threaded plug, the lower end of which, intended for attachment to the rod, is provided with hooks in the form of one or more tips.
The disadvantage in this implantation device is the difficulty in manipulating it when tightening it, which often leads to the longitudinal support not being optimally clamped and over time, pulling out the screw.
The invention is intended to provide assistance here. The invention is directed to the task of creating a fixation element and a device for the manipulation of this osteosynthetic fixation element, which, on the one hand, permits powerful intrasurgical manipulation of the implant and, depending on the embodiment of the implant, offers the opportunity to tighten the fixation element in its position relative to the bone, or to tighten it to other fixation elements, simultaneously with the manipulative process.
The invention solves the task posed with an osteosynthetic fixation element that has the characteristics of claim 1, and a device for the manipulation of the osteosynthetic fixation element that has the characteristics of claim 13.
Further advantageous methods of embodiment are characterized in the subclaims.
The advantages achieved through the invention are to be seen essentially in the fact that it facilitates a powerful insertion and removal motion of the pedicular screws into the vertebral column and hooking and unhooking of the vertebral column hooks. When the pedicular screw is inserted into the bone or the vertebral column hooks are hung, the manipulation device can be used to exert forces and torque via the screws (or the hooks, respectively) on the vertebral column and thus can manipulate deformities. Further advantages lie in the fact that the manipulation device can be removed at any time and remounted and that, via the manipulation device, the implant can be moved in such manner that the longitudinal support can come to lie optimally along the implant.
The invention and additional methods of embodiment of the invention are explained in greater detail below using partial schematic diagrams of several methods of embodiment.
They show:
FIG. 1 is a perspective diagram of the osteosynthetic fixation element in the form of a pedicular screw;
FIG. 2 is a perspective diagram of the osteosynthetic fixation element in the form of a vertebral hook;
FIG. 3 is a cross-section through the upper portion of the pedicular screw pursuant to FIG. 1;
FIG. 4 is an exploded view of the manipulation device pursuant to the invention;
FIG. 5 is a perspective diagram of the assembled manipulation device pursuant to FIG. 4;
FIGS. 6-12 are perspective diagrams of other methods of embodiment of the fixation element pursuant to the invention;
FIG. 13 is a cross-section through the upper portion of a method of embodiment of the fixation element pursuant to the invention and of the lower portion of the manipulation device; and
FIG. 14 is a perspective diagram of an additional variation on a fixation element.
Fixation element 10 pursuant to the invention, shown in FIG. 1 or 2 in the form of a pedicular screw or a vertebral hook, consists essentially of lower portion 2 (screw shaft or hook shaft) that can be anchored to the bone, and upper section 3 connecting thereto, in the direction of its longitudinal axis 1
REFERENCES:
patent: 4611581 (1986-09-01), Steffee
patent: 4763644 (1988-08-01), Webb
patent: 5181917 (1993-01-01), Rogozinski
patent: 5263954 (1993-11-01), Schlapfer et al.
Amrein Thomas
Frigg Robert
Recher Daniel
Schlapfer Johannes F.
Trebing Linda
Jackson Gary
Mulcare Nancy
Synthes (U.S.A.)
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