Stereotaxic device for percutaneous twist-drill insertion of depth electrodes and for brain biopsy

Technical note

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✓ A stereotaxic device is described for percutaneous twist-drill insertion of depth electrodes for seizure recording and brain biopsy. This apparatus, which permits a lateral orthogonal approach, has been used in conjunction with a Leksell type of stereotaxic frame. Its main advantages are the ample working space it provides at the site of insertion of intracerebral electrodes, and the stable attachment it offers in fixing these electrodes on the skull.

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Address reprint requests to: André Olivier, M.D., Montreal Neurological Hospital, 3801 University Street, Montreal, Quebec, Canada H3A 2B4.

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  • View in gallery

    Photograph of the assembled apparatus. The sliding side-bar and the carrier can be fixed on both sides of the frame and brought to any target point by means of an x-y reference.

  • View in gallery

    The depth of penetration into the brain (z coordinate) is calculated by means of a ruler equipped with a collet chuck. The distance between the collet and the 0 on the ruler equals the distance between the collet of the carrier and the middle of the frame.

  • View in gallery

    A twist drill is held in the collet chuck by a metal cuff. The drill perforates both tables of the skull.

  • View in gallery

    The recording electrode is placed on target through a brain cannula. A supporting rod and clamp immobilize the recording electrode on target while the cannula is withdrawn. Acrylic is used to fix the electrode to the screw.



Talairach JDavid MTournoux Ret al: Atlas d'Anatomie Stereotaxique. Paris: Masson1957294 ppTalairach J David M Tournoux R et al: Atlas d'Anatomie Stereotaxique. Paris: Masson 1957 294 pp




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