Medical treatment applicators and parts thereof; medical devices for surgical use; medical apparatus and instruments for use in endoscopic procedures; medical probes and instruments for laparoscopic or percutaneous delivery applications; medical apparatus and instruments for use in cardiac or cardiovascular surgeries, procedures and treatments; medical devices, apparatuses and instruments for modification or ablation of biological tissue; medical instruments for ablation, sensing or mapping for use in electrophysiology medical procedures; catheters and parts and fittings therefor; medical voltage generators and parts thereof; medical and surgical clamps; cardiac clamps; cables, connectors and adaptors for use with medical or surgical instruments, or cardiac catheters; medical device systems for ablating biological tissue comprising a voltage generator, computer software, display, cables, adapters and connectors, sold as a unit with printed instruction manual