Patent ID: 7108686

Claim:
An implantable infusion device, comprising: a housing including an inner wall and having an interior region defined at least in pat by the inner wall, at least a portion of the interior region defining an infusate reservoir adapted to store an infusate therein for delivery to a patient; a closed free-floating variable volume chamber having an outer wall, the variable volume chamber disposed within the interior region of the housing with the outer wall of the variable volume chamber being spaced from the inner wall of the housing, the variable volume chamber being supported within the interior region from an internal portion of the inner wall of the housing; a pressure source contained within the variable volume chamber; an infusate recharging fluid flow path adapted to recharge the infusate reservoir by carrying infusate to the infusate reservoir through the internal portion of the housing from which the variable volume chamber is supported within the interior region; and an exit fluid flow path adapted to deliver infusate from the infusate reservoir out of the housing.