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Cannulae designed to be inserted into the cranium, providing access to the brain (e.g., for a therapeutic or diagnostic procedure). These cannulae are typically short, rigid or semirigid, plastic, or less frequently, metallic tubes. Intracranial cannulae are frequently connected directly or via an external tube or catheter to an irrigator and/or aspirator for irrigation, infusion, or withdrawal of substances. Intracranial cannulae may also provide a port through which instruments and/or probes are passed to perform a variety of diagnostic, treatment, or surgical procedures.
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