Study for Safety and Efficiency of Therapeutic Angiogenesis for Patients With Limb Ischemia by Transplantation of Human Cord Blood Mononuclear Cell

Inclusion Criteria:Patients with ischemic symptoms such as claudication, rest pain or nonhealing ischemic wound * Without evidence of improvement in response to conventional medical therapy * Not candidates for surgical intervention or radiologic intervention Exclusion Criteria: * Malignant disease * More than 60 years old * Other significant medical conditions, including diabetes mellitus, hypertension, hyperlipidemia, etc.