A cikin Maganin Rauni mara kyau (NPWT), bututun tsotsa abu ne mai mahimmanci wanda ke aiki azaman magudanar ruwa tsakanin suturar rauni da injin famfo, yana sauƙaƙe cire ruwa da tarkace. Bututu, wanda shine ɓangare na tsarin NPWT na gaba ɗaya, yana ba da damar matsa lamba mara kyau a kan gadon rauni, yana inganta warkarwa.
