A sterile, steerable, thin, flexible tube containing multiple electrodes that is introduced percutaneously into the heart chambers in order to relay information to an external cardiac mapping system to create a three-dimensional (3-D) electromechanical reconstruction map of the heart chamber. The device also incorporates a small hollow needle intended for targeted delivery of diagnostic and therapeutic agents into the myocardium. The device is typically made of plastic with embedded electrodes often of platinum (Pt), iridium, or a composite. This is a single-use device.