Thoroughly clean the necrotic tissue, the purulent fluid and the foreign in the wound and the cavity gap and set up favorable blood supply.
2.Design dressing
Cut and cover the dressing according to the size of the wound, use the method of serial or parallel to connect the dressing according to the size of wound, direction of Perfusion drainage tube based on the principle of convenient sealing.
3.Sealing and paster
Put adhesive side of paster on the dressing and cover its center, then stick the paster
on the rim of wound skin. The common method of paster include Imbricate, stick together, raise exsertum tube and paster together with around skin way, make dumpling.
4.Connecting to the negative pressure source
Connect the dressing, Y-connector, straight connector and negative pressure source together. Keep negative pressure among -125mmHg～-450mmHg（-0.017Mpa ～ -0.060Mpa）. after surgical operation continue suction for 48 hours, then use the method of interrupted suction, start 5 minutes and stop 2 minutes.
