Participants who are determined to undergo open abdomen surgery will be screening for the eligibility first. If eligible and agreed to participate, each participant will be assigned to either the experimental group or control group based on the electronic randomization. The experimental group will use the plastic ring wound retractor, while the control group will use a conventional surgical pad for wound protection method. Each participant will be blind to the randomization result because he/she will be under general anesthesia. Once the surgery is finished, the patient will be assessed on the surgical wound at postoperative day 1, 7, 14, 30. Two groups will be compared for the surgical wound infection rate.