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Abstract

A method for guiding a stereotaxic instrument at a target point in an intracerebral cavity comprising fixing detachable roentgenocontrast markers with respect to the patient's cranium, then effecting contrast roentgenography and determining the relative position of the markers and intracerebral reference points. Subsequently, the position of a target point with respect to the intracerebral reference points is determined and a physical model of the intracerebral cavity is constructed to include the points simulating the markers and a point simulating the target point. A stereotaxic apparatus is installed on the patient's head, the detachable roentgenocontrast markers are again fixed with respect to the patient's cranium, the position of the detachable markers with respect to the stereotaxic apparatus is identified and the positions of the detachable roentgenocontrast markers with respect to the stereotaxic apparatus are set-up in the model of the stereotaxic apparatus. The physical model of the intracerebral cavity is then oriented with respect to the model of the stereotaxic apparatus, a guiding device with a stereotaxic instruments is installed in the model of the stereotaxic apparatus, the active end of the stereotaxic instrument is brought into registry with the point of the physical model of the intracerebral cavity simulating the target point, and the position of the stereotaxic instrument in the guiding device is fixed. A trepanation opening is then formed and the guiding device with the stereotaxic instrument is mounted on the stereotaxic apparatus and the stereotaxic instrument is introduced into the trepanation opening.

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