Assessment of the Sub-gonal Arterial Revascularization of the Lower Limbs in Critical Ischemia by Venous Allograft Stored at + 4 ° C (ERAV)

Inclusion Criteria: * Man or woman over 18 (under effective contraception, hormonal contraceptive or intrauterine device, if premenopausal). * Patient with critical ischemia of the lower limb (stage 4-5-6 according to the Rutherford classification) requiring revascularization by sub-gonal bypass * Patient eligible and scheduled for bypass in venous allograft stored at + 4 ° C with distal anastomosis below the knee * Patient without usable autologous great Saphenous vein * Subject affiliated or beneficiary of a social security scheme * Patient having received the appropriate information concerning the objectives and procedures of the study and having declared his non-objection. Exclusion Criteria: * Use of unscheduled allografts * Patient requiring composite bypass in AGV + autologous venous material or prosthesis * Patient requiring replacement of infected prostheses * Patient with acute ischemia * Patient with severe coagulation disorders * Patient classified physical status score 4 * Patient participating in another clinical trial * Potential allergy to the graft * Protected patients: Adults under guardianship, curatorship or other legal protection, deprived of their liberty by judicial or administrative decision * Pregnant or breastfeeding woman