
2.3. VSD GROUP
STERILE
Pending the outcome of the exploration incision, the PVA foam was cut and applied to the entire wound surface to ensure full contact with the wound surface. The outer layer of the biological semipermeable membrane is covered with foam. To achieve airtightness, the bio occlusive transparent film should reach 5 cm beyond the edge of the wound edge. When a drainage tube is difficult to seal, the “mesangial technique” should be employed to close it. The VSD device was sealed before use. The irrigation pipe and suction pipes were connected, and the irrigation pipe was filled with sterile saline solution. The suction pipe was connected to a negative- pressure system located at the center of the wall. The negative pressure was adjusted until the transparent layer outside the VSD device foam was compressed,