Catheter having common lead for electrode and sensor

摘要

An apparatus for delivering energy to a biological site includes a catheter having a plurality of electrodes arranged in a linear array, the electrodes positioned proximal the biological site. A power control system supplies power, each having a controllable duty cycle and phase angle, to each of the electrodes. A backplate is also positioned proximal the biological site so that the biological site is interposed between the electrode device and the backplate. The backplate is maintained at the reference voltage level in relation to the power. The power control system controls the phase angle of each power signal so that current flows between the electrodes and between the electrodes and the backplate results. Temperature sensors are located at the electrodes and each shares a common lead with the power circuitry. The temperature sensor signal is received by the power control system during the off-period of the duty cycle of the particular electrode.