Cranial guide for an intracranial medical procedure

A cranial guide for an intracranial medical procedure to be performed on a patient, comprising:

• a cranial port including:
• a stem that is generally cylindrical and configured to be anchored in a burr hole to be formed in the patient's cranium;
• a cap including a distal surface interconnected to the stem, a sidewall portion extending proximally from the distal surface, and a chamber;
• a lumen having an interior diameter which extends through the stem to the chamber to define a passage through the cranial port;
• and
• a key hole extending through the cap sidewall portion;
• a guide cannula including:
• a head having a sidewall portion and a proximal portion, the head adapted to be received within the chamber of the cap, wherein the guide cannula can be rotated axially with respect to the cranial port;
• a plurality of apertures spaced around the sidewall portion of the head, each of the apertures alignable with the key hole;
• and
• at least one channel extending through the head and including a distal outlet;
• and
• a fixture configured to extend at least partially through the key hole into any of the plurality of apertures aligned with the key hole to prevent rotation of the guide cannula with respect to the cranial port.