Medical devices, namely, surgical devices that facilitate endoluminal treatment of biologic tissues; Medical and surgical devices and instruments, namely, catheters for the endoluminal treatment, ablation, cauterization and hemostasis of tissue that comprise of an electrode in the catheter tip for generating thermal energy; Medical and surgical devices and instruments, namely, catheters for the endoluminal treatment ablation, cauterization and hemostasis of biological tissue.; Medical and surgical devices and instruments, namely, catheters for the endoluminal treatment, ablation and isolation of tissues using an energy source located in the system for generating ablative energy; Medical and surgical devices and instruments, namely, catheters for the endoluminal ablation, ablation, cauterization and hemostasis of tissue; Medical and surgical devices and instruments, namely, ablation catheters for the endoluminal ablation, cauterization and hemostasis of vascular structures