A method, technique and system is disclosed for the delivery of
therapeutic agents and/or into the bulk brain tissues and other parts,
tissues and organs of the body, including vasculature. A novel form of
coaxial catheter provides a means for implanting an outer tube into the
brain, then inserting an inner tube into the outer tube and aligning them
such that port holes on both of the tubes will overlap and permit a flux
of the therapeutic agent to flow into the brain in such a way as to
minimize the effects of trapped air, virtually eliminate backflow of the
agent, and avoid the potential for additional damage to the brain since
only one surgical placement of the outer tube is needed. Similarly, the
method, technique system may be utilized to remove fluids or other medium
from the brain, tissues, and organs to minimize the effects of escaped
air or negative pressure.