Patent ID: 7442183

Claim:
An implantable agent delivery system for providing treatment therapy to a volume of neural tissue comprising in combination: a cannula having a central lumen distal end with a plurality of openings provided near the lumen distal end, each opening capable of directing a catheter outwardly along a distinct predetermined trajectory, at least one of the openings having a curved passageway defined by an inner curve and an outer curve, the inner curve and the outer curve having substantially the same shape so as to direct a catheter away from the central axis of the cannula along the predetermined trajectory, wherein, in operation, slicing caused by installation of the catheter may be substantially avoided; a first catheter and a second catheter that are insertable within the cannula, wherein the first catheter protrudes through a first opening of the cannula and the second catheter protrudes through a second opening of the cannula, wherein each catheter is positioned to deliver a liquid agent, and wherein the liquid agent has a desired effect in providing the treatment therapy; and a therapy delivery device that stores the liquid agent and couples to the first catheter and the second catheter to deliver the liquid agent, wherein the cannula, the first and second catheter and the therapy delivery device are each configured to be completely implantable under a skin of a patient.