Tortuose path injection device and method

摘要

Devices and methods for delivering therapeutic or diagnostic agents to a target tissue of a human body are disclosed. A catheter in accordance with the present invention includes an injection catheter assembly having a first elongated member with a proximal end, a distal end, an external surface, and an inside surface defining a first lumen. The catheter includes a second elongated member having a proximal region and a distal region. The second elongated member is positioned at least partially within the first elongated member. The second elongated member has a second helical member fixed to an end. The catheter also includes a third elongated member. The third elongated member defines a lumen along a portion of the length of the first elongated member. The third elongated member has a first helical member. The second helical member is longitudinally moveable within the lumen of the first helical member to move the second elongated member longitudinally.