<qa>  What is the name of the ischemia that is confirmed as per Rutherford- II- Established critical limb ischemia, clinically and hemodynamically confirmed as per Rutherford- II-4, III-5, or III-6; Patients having Infra-inguinal arterial occlusive disease with rest pain or ischemic ulcernecrosis, who are not eligible for or have failed traditional revascularization treatment 