Surgery – Instruments – Orthopedic instrumentation
Patent
1993-05-25
1995-03-14
Pellegrino, Stephen C.
Surgery
Instruments
Orthopedic instrumentation
606 54, A61B 1760
Patent
active
053973224
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
Description of the Prior Art
External bone fixation for the therapy of skeletal fractures of limbs has been in use for many years in traumatologic medicine.
External fixation substitutes the use of immobilizing plastering apparatuses which always involve a long rehabilitation, and, at the same time, often avoids an operation in open air.
However, it is often a difficulty using a manipulator for performing reduction to obtain an optimum anatomic reconstruction of the fractured skeletal segment.
The various commercially available external fixator systems do not allow such fracture manipulation, or they allow them only partially. Their placement therefor risks often making the already obtained reduction result worse, and often with a complicated and approximative mechanical structure. Manipulators available are not suitable to be applied to any external fixing system and can not be removed from the system, after having performed the necessary fracture reduction manoeuvers.
Movements allowed with currently used manipulators do not necessarily concern the fracture section and require action on more than one key.
SUMMARY OF THE INVENTION
It is an object of the present structure industrial invention to suggest a means that makes the reduction manoeuvers easier by allowing micrometric (small) displacements of the bone fragments to be reduced.
It is an additional object of the invention to allow the reduction manoeuvers to be practised independently of each other, so as not to compromise the already obtained fracture reduction result.
The manipulator of the present invention is intended to be removed or to remain applied to a limb through the proper fixation elements, and to this end it is provided with clamping members that ensure a stable maintenance of the position reached during reduction. Furthermore, its geometrical construction allows all monuvements to take place in the fracture section.
The present invention is realized by a manipulator which allows, by acting upon proper screw handlebar grips, a micrometric displacement of the fractured bone fragments in all the possible directions realizing all the degrees of freedom and all the required relative axial and angular rotations.
BRIEF DESCRIPTION OF THE DRAWINGS
The manipulator shown in a preferred embodiment thereof is given as a matter of example and not of limitation in the annexed drawings.
FIG. 1 is an axonometric front side view that shows it in the stage of its utilization applied to a fixer of a known type;
FIG. 2 is a top isometric view the manipulation of angular rotation in the horizontal plane made possible by the manipulator of the present invention;
FIG. 3 illustrates the particular mating between the toothed sector and the endless screw that allows some rotation manoeuvers;
FIG. 4 shows in a rear isometric view the possible maneuver for the axial slide of the fragments;
FIG. 5 represents the manipulator in a rear isometric view that shows the manoeuver for the transverse slide in the horizontal plane; and
FIG. 6 is a front view of the detail of the sector that allows the axial rotation of the fragments.
DESCRIPTION OF THE PREFERRED EMBODIMENT
With reference to the figures, the manipulator is made up of a sector that extends a quarter of a circle and is comprised of two half sector portions 1 and 2 having guides fit for sliding angularly on each other. A screw 3 that is located in a slit 4 which goes through a large part of sector 2 is loosened to allow the relative sliding movement of portions 1 and 2.
In this way the sector arc can be varied from about 60.degree. to about 120.degree..
A screw 5 engages with teeth 6 which are provided on a portion of the contact faces of the two sectors 1 and 2 and allows a micrometric displacement of one sector portion with respect to the other.
Each sector portion at the end which is not slidably engaged projects respectively into or is formed integral with blocks 7 and 8. Blocks 7 and 8 are shaped having a recess to receive bushings 9 and 10. Bushing 9 and 10 are displace
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patent: 4604997 (1986-08-01), DeBastiani et al.
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patent: 4628919 (1986-12-01), Clyburn
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patent: 4988349 (1991-01-01), Pennig
patent: 5100403 (1992-03-01), Hotchkiss et al.
patent: 5122140 (1992-06-01), Asche et al.
patent: 5160335 (1992-11-01), Wagenknecht
Akers Lawrence C.
Augustin Raymond W.
Jaquet Orthopedie S.A.
Pellegrino Stephen C.
Richardson Peter C.
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