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Jig for positioning an instrument to be introduced into an object

  • US 5,682,892 A
  • Filed: 04/26/1996
  • Issued: 11/04/1997
  • Est. Priority Date: 04/26/1995
  • Status: Expired due to Fees
First Claim
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1. A jig for positioning an instrument to be introduced into an object to be examined, comprising a stop for defining the position of a free end of the instrument in a first coordinate direction of a three-dimensional system of coordinates, and adjusting means for adjusting the position of the instrument in second and third coordinate directions of the system of coordinates, said adjusting means being accommodated in a housing in which furthermore a phantom is rigidly mounted, wherein the adjusting means comprise a first and a second circular disc having a first and a second central axis respectively, each central axis extending perpendicularly to the plane of the respective disc and through its center, the first disc being journalled in the housing so as to be rotatable about the first central axis and being provided with an eccentrically situated circular opening whose diameter is substantially equal to the diameter of the second disc, the second disc being journalled in said opening so as to be rotatable about the second central axis, the arrangement being such that the first and second central axes extend parallel to the first coordinate direction and the first central axis intersects the plane of the second disc at a distance from the center of the second disc which is smaller than the radius of the second disc, a passage being provided in the second disc at the same distance from the center, said passage being arranged to guide the instrument in the first coordinate direction.

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