The aim of the study is to evaluate the effect of a biological dressing on the healing process of venous ulcers. The dressing is a reconstructed skin substitute made with the patients own cells.

The hypothesis of this trial is that the cutaneous model SASS, a dermal epidermal skin substitute, created by the LOEX could be as high-performant, or even better, than the one's already existent in North America for the wound care. We anticipate showing on 6 patients that ulcer that did not close with conventional treatment, will heal or at least improve with this treatment.

Inclusion Criteria:

1. Men or women from 18 to 85 years old
2. Have a venous ulcer or a mixed ulcer

Exclusion Criteria:

Diabetes Mental deficiency Hepatitis holder (A-B-C) HIV positive Pregnancy or lactation Corticosteroids therapy Radiotherapy Chemotherapy