Medical devices, namely, cardiac ablation devices; medical devices for surgical use; surgical devices that facilitate modification or ablation of biological tissues; medical devices for non-thermal ablative procedures; ablation catheters and electrodes; cardiac clamps; adapters and connectors for use with medical instruments; cardiac catheter adapters; cardiac surgery adapters; catheters for use in cardiac ablation procedures; percutaneous electrodes and probes for ablative procedures; catheter sensing cables; pulse generators; medical device system for ablating cardiac tissue comprising a pulse generator, cardiac clamp, cardiac surgery adapter and connectors, medical electrodes and instructions manuals; medical device system for ablating cardiac tissue comprising a pulse generator, an ablation catheter, sensors, instrument adapter and connector, medical electrodes and instruction manuals; sensing or mapping instruments used in conjunction with computer software for electrophysiology procedures