Clinical Study on Veloderm for the Treatment of Split-thickness Skin Graft Donor Sites

Inclusion Criteria: * Aged 18-65 years * Male or female patients * Skin lesions or losses by burns, plastic surgery, sores, abrasions, donor graft areas and after debridement of chronic wounds * The area of skin loss or burn surface is less than 50% of total area of body surface * Subject undergoing first skin harvest 0.25-0.35mm and donor site having a surface area\>100cm2 * Subject who is willing to participate in the trial and to sign the informed consent form. Exclusion Criteria: * Area of skin loss or burn surface is larger than 50% of total area of body surface * Electrical burns or chemical burns * Burns complicated by combined injury * Test wound needs drugs that may affect wound healing * Subject who has a known hypersensitivity to hemycellulose * Contraindication to the use of semi occlusive dressing * Pregnant or lactating subject * Any severe disease which in the Investigator's judgement might interfere with study evaluations or threaten patient's safety * Subject who has chronic renal disease or renal inadequacy, or serum creatinine is more than twice the upper limit of normal * Subject who has a definite liver disease, TBil or AST, ALT is more than twice the upper limit of normal * Subject with active hemorrhoea or shock or visceral injury; Subject who has participated in this clinical study or other clinical studies within 3 months * Subject with mental impairment limiting the ability to comply with study requirements; Subject undergone chronic treatment with immunosuppressants, antineoplastic drugs and corticosteroids for a long time * Subject who has not signed the informed consent form.