→ Effectively shrink the size of incision surgery, maximum open wounds, meanwhile view of surgery can be fully exposed;
→ Equal wounds tension reduces tissue injury;
→ Viscera can be pulled out to be operated;
→ Original design, multiple models, can satisfy every demand of different surgeries;
→ Smaller incision, smaller incision better concrescence;
→ Prevention of II or III wounds or incision infection, prevention of tissue burns censed by mistake operation.