Bioglass Wound Dressing in Treatment of Chronic Wound in Different Stage：a Randomized Controlled Trial

The goal of this randomized control trial is to test the efficacy and safety of a bioglass wound dressing in patients with chronic wound in different stages. The main question it aims to answer are: * Whether the bioglass wound dressing have better efficacy and safety than blank control in treatment of chronic wound in necrosis stable stage？ * Whether the bioglass wound dressing have better efficacy and safety than blank control in treatment of chronic wound in granulation growth stage？ Participants will be assigned with a 1:1 ratio into intervention group and control group. Participants of intervention group will receive bioglass wound dressing in addition with clinical optimal treatment plan. Participants of control group will only receive clinical optimal treatment plan.