Localization cap for fiducial markers

A - Human Necessities – 61 – B

Patent

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Details

A61B 6/00 (2006.01) A61B 6/12 (2006.01) A61B 19/00 (2006.01) G06K 9/32 (2006.01) G06T 5/00 (2006.01) G06T 7/00 (2006.01) G06T 7/60 (2006.01) A61B 5/055 (2006.01) A61B 17/16 (2006.01) A61B 17/88 (2006.01)

Patent

CA 2177139

A detachable cap for use in determining the location of the center of the imageable portion of a fiducial marker is disclosed. The lower portion of the cap has three arms (218) and a boss (220) for providing a detachable connection with an implanted base portion (30) to which an imaging marker (10) can be attached. The upper portion of the cap includes a divot-like depression (234) that is configured to mate with a ball (52) whose center can be determined. The ball, marker and divot are configured so that the center of the ball, when mated to the divot is coincident with the center of the marker when it is attached to the base in place of the cap. Knowledge of the location of the center of the ball when it is brought into engagement with the divot of the cap can be used to determine the location of the center of the marker when it is attached to the base.

L'invention se rapporte à un capuchon amovible servant à déterminer l'emplacement du centre d'une partie, pouvant former une image, d'un dispositif de repère de centrage. La partie inférieure de ce capuchon comporte trois bras (218) ainsi qu'une protubérance (220) permettant le raccordement amovible d'un support (30) inséré sur lequel on peut fixer le dispositif de repère de visualisation (10). La partie supérieure du capuchon comprend une dépression (234) cupuliforme dont la forme lui permet de coopérer avec une bille (52) dont le centre peut être déterminé. La bille, le dispositif de repère et la dépression cupuliforme sont conçus de manière que le centre de la bille, lorsque celle-ci est logée dans la dépression cupuliforme, coïncide avec le centre du dispositif lorsque ce dernier est fixé sur le support pourvu du capuchon. Le fait de connaître l'emplacement du centre de la bille, lorsqu'elle est logée dans la dépression cupuliforme, permet de déterminer l'emplacement du centre du dispositif de repère lorsque celui-ci est fixé sur son support.

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