RecruitingDevice studySaline Enhanced Radiofrequency (SERF) Needle Ablation for Refractory VTThe Thermedical Ablation System and Durablate catheter is indicated for use in patients with recurrent, sustained, monomorphic ventricular tachycardia (SMVT) refractory to drug therapy and conventional (approved) catheter ablation. Subjects with recurrent, SMVT refractory to drug therapy and conventional catheter ablation who are not eligible for, or will not likely benefit from repeat endocardial ablation using an approved catheter.