Efficacy/Safety of Ecraprost in Lipid Emulsion for Treatment of Critical Leg Ischemia Due to Peripheral Arterial Disease

Inclusion Criteria: * Critical leg ischemia (CLI) defined as distal extremity pain at rest, or peripheral ischemic ulcer(s), with severe hemodynamic impairment as diagnosed by ankle systolic pressure, toe systolic pressure or TcPO2 * The subject has exhausted all standard revascularization treatment options at this time. Exclusion Criteria: * Subjects with a previous major amputation (at or above ankle) * Subjects with end stage renal disease (ESRD) defined as significant renal dysfunction evidenced by estimated creatinine clearance of \< 20 cc/min, or receiving chronic hemodialysis therapy.