4、onContiniousnegativepressuredrainageiseasytodrainexudateandnecrosiscompletely,andthepipeisrarelyblocked.Thedrainageisinfavorofimprovinglocalmicrocirculation,decreasinglocaltissueedema,stimulatingthegrowthofgranulationtissue,andaccel-eratingtheprocedureofwoundhealing. Ke