Post-Market Clinical-Follow-Up Study of Suprasorb® C Collagen Wound Dressing

Inclusion Criteria: * Patient over 18 years of age and under 85 years of age * Patient suffering from confirmed venous or mixed vascular leg ulcers * Stagnating wound conditions, i.e. exudation phase \> 2 months, not responding to traditional dressing and standard treatment (standard treatment is a clear definition and for venous ulcers compression should be included) * Target ulcers between 2 cm and 10 cm in the largest diameter * Written confirmation from the study nurse that the patient was informed, orally agreed to participate and to comply with study treatment and planned visits Exclusion Criteria: Use of Suprasorb® C collagen wound dressing is contraindicated according to the current IFU: * Clinically infected areas * Presence of known allergies to one or several of its components. In addition following patients shall not be included into this study: * Patient not covered by health insurance/social security * Patient suffering serious life threatening disease * Pregnant or breastfeeding women * Minor patient, protected adult, person without liberty