Is it ensure, insure, or assure?
insufflate in·suf·flate (ĭn'sə-flāt', ĭn-sŭf'lāt')
v. in·suf·flat·ed, in·suf·flat·ing, in·suf·flates
To blow into, especially to fill the lungs of an asphyxiated person with air, or to blow a medicated vapor, powder, or anesthetic into the lungs, or into any cavity or orifice of the body
To treat by blowing a medicated powder, gas, or vapor into a bodily cavity.