A prospective randomized comparative study between the novel form dressing and conventional silver form dressing for exuding wounds

INTERVENTION: Apply the novel dressings after its irrigation using saline, distilled water or tap water. Apply the silver dressings after its irrigation using saline, distilled water or tap water. CONDITION: traumatic wounds,postoperative wound dehiscence or chronic skin ulcers PRIMARY OUTCOME: The decrease of the bacteria count on Day 4 SECONDARY OUTCOME: 1.The decrease rate of the bacteria count; 2.The decrease rate of the wound area; 3.The Improvement of the score of wound exudate INCLUSION CRITERIA: 1.20 years of age or over 2.traumatic wounds, postoperative wounds 3.Maximum area of ulcer is within 11cmx11cm 4.written informed consent