Multipolar electrode for body tissue

摘要: A bipolar electrode 10 capable of sensing the electrical activity in a localized portion body tissue includes disc 12 having surface 12A adapted to be brought into proximity tissue, and an inner or conductive spike 14 first outer helix 16 that are supported by extend from 12A. Corkscrew surrounds 14, tip 16A is located at greater distance away than 14A 14. Tripolar electrodes 30, 50 utilize this structure along with second 38 (in tripolar 30) annular ring 58 50) for respectively applying pacing defibrillation pulses heart.