The document summarizes six case studies of patients with thromboangiitis obliterans (Buerger's disease) who were treated with leech therapy. All six patients were male smokers between the ages of 44-63 presenting with symptoms like gangrene, pain, and loss of circulation in fingers and toes. They underwent between 3-8 sessions of leech therapy, applying 5-8 leeches per session. After completing leech therapy, all patients' subjective symptoms disappeared and gangrenous lesions healed without requiring amputation. The document discusses the potential mechanisms of action and therapeutic effects of leech therapy for Buerger's disease.