Prosthesis (i.e. – artificial body members) – parts thereof – or ai – Implantable prosthesis – Bone
Patent
1999-11-22
2000-10-24
Philogene, Pedro
Prosthesis (i.e., artificial body members), parts thereof, or ai
Implantable prosthesis
Bone
623 2315, A61F 236
Patent
active
061360376
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to an aiming device for an implant to attend trochanter and subtrochanter fractures.
BACKGROUND OF THE INVENTION
From the EP 0 496 950 B1 is known an aiming device for an implant to attend trochanter and subtrochanter fractures comprising a head with a pin for holding a femur pin which is inserted into the marrow area. Furthermore, this aiming device comprises an aiming arm, which is mounted laterally on the head and extends approximately parallel to the femur pin and comprises at least two slanted aiming bores aligned to proximal slanted bores of the femur pin for a shank neck screw and at least one transverse aiming bore aligned with a distal transverse bore of the femur pin for a distal locking screw for accomodating a bore sleeve. The head is in its conventional form of embodiment undetachably mounted on the aiming arm. Furthermore, the head comprises arresting means for detachable mounting as well as a striking surface for driving in the femur pin. The aiming arm comprises a plurality of slanted aiming bores which are at different angles relative to the aiming arm axis and are at least partially crossed by the transverse aiming bore. This design allows accommodation of all aiming bores in a relatively short section of the aiming device, so that the aiming device can be of respective compact construction.
A disadvantage of the known design lies in the rigid association of all aiming bores relative to each other. In particular, the known aiming device does not allow in particular matching of transverse aiming bores to different distal transverse bores of the femur pin. It has to be taken into consideration that modern femur pins have elongated transverse bores in the distal area in order to be either statically or dynamically locked. The known aiming device is unsuitable for this due to the static association of the aiming bores relative to each other.
SUMMARY OF THE INVENTION
It is an object of the present invention to offer an aiming device of the aforedescribed type which has more degrees of freedom relative to the transverse aiming bores.
This object is achieved according to the invention by an aiming device having a head for joining a femur pin, an aiming arm, and a plateshaped insert element. The aiming arm is mounted laterally to the head and extends approximately parallel to the femur pin. The aiming arm has at least two slanted aiming passages aligned to a proximal slanted passage of the femur pin for one of a shank element, and at least two transverse bores aligned to a distal transverse bore of the femur pin to accommodate a sleeve. The slanted aiming passages include different angles relative to an axis of the aiming arm, and longitudinal axes of the slanted aiming passages cross the longitudinal axes of the transverse aiming bores. The plateshaped insert element is placeable and fixable within a corresponding passage in the aiming arm, and has a longitudinal center axis. The transverse aiming bores are part of the insert element and extend parallel to the longitudinal center axis, at a variant distance therefrom so that the transverse aiming bores are displaceable by turning the insert plate by 180 degrees.
The inventive design distinguishes itself for one in that it can be of extremely compact design, and for this purpose at least the distal slanted aiming passage in the aiming arm intersects with the passage for the plateshaped insert element or the insert plate in which the transverse aiming bores are established. The variability of the inventive aiming device is obtained in that insert plates of differently directed and/or differently dimensioned and/or differently spaced transverse bores are made available. The transverse aiming bores of an insert plate may extend either parallel to each other or at an angle to each other.
Particularly advantageous is the form of embodiment, according to which the transverse aiming bores extend parallel to the longitudinal centre axis of the insert plate but at a different distance therefrom. This mak
REFERENCES:
patent: 4976713 (1990-12-01), Landanger et al.
patent: 5334192 (1994-08-01), Behrens
patent: 5941879 (1999-08-01), Walulik et al.
Habegger Christian
Hassig Christoph
Schmotzer Hans
Intraplant AG
Philogene Pedro
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