Apparatus for locating transverse holes of intramedullary implantates
First Claim
1. An apparatus for positioning a drilling jig in axial alignment with at least one predisposed transverse hole in an implanted intramedullary nail, said apparatus comprising at least a first directional element in the form of a magnet (13,16) producing a directional field, and a second directional element in the form of a magnetic field detection device (8,9) with unidirectional reception characteristic;
- wherein one of said two directional elements is adapted to be aligned with a directional pattern thereof to the axis of the transverse hole (11) to be located, and the other directional element is freely movable; and
the output signals of the magnetic field detection device (8,9) are fed, through a signal evaluation and processing device (15), to a display device (17) displaying the relative position of the directional characteristics of said two directional elements to each other.
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Accused Products
Abstract
The apparatus serves to locate transverse holes V of intramedullary implantates, especially in the distal end of implanted interlocking nails, in the fracture treatment of bones. The apparatus includes at least one magnet (13, 16) generating an axially symmetrical field, and a magnetic field detection device (8, 9) having an axial reception characteristic, with one of said two directional elements being adapted to be aligned on the axis of the transverse hole (11) to be located. The other one of said two directional elements, e.g. the magnet (13), is freely movable exteriorly, and therefore adapted to be aligned with the axis of the transverse hole. The output signals of the magnetic field detection device (8, 9) are presented on a display device (17) through a signal processing device (15). By relative displacement of the magnet (13) and of the magnetic field detection device (8, 9), the two axes thereof may be made to coincide, which state can be displayed on the display device by a zero point indication.
281 Citations
22 Claims
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1. An apparatus for positioning a drilling jig in axial alignment with at least one predisposed transverse hole in an implanted intramedullary nail, said apparatus comprising at least a first directional element in the form of a magnet (13,16) producing a directional field, and a second directional element in the form of a magnetic field detection device (8,9) with unidirectional reception characteristic;
- wherein one of said two directional elements is adapted to be aligned with a directional pattern thereof to the axis of the transverse hole (11) to be located, and the other directional element is freely movable; and
the output signals of the magnetic field detection device (8,9) are fed, through a signal evaluation and processing device (15), to a display device (17) displaying the relative position of the directional characteristics of said two directional elements to each other. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
- wherein one of said two directional elements is adapted to be aligned with a directional pattern thereof to the axis of the transverse hole (11) to be located, and the other directional element is freely movable; and
Specification