원래 이름 기록: Hollister Incorporated

An ostomy pouch appliance includes a gas outlet formed in one of the pouch walls for egress of gas collected in a pouch collection cavity, a filter assembly attached to the pouch wall covering the gas outlet and a prefilter configured to protect the filter assembly. The prefilter may have a crescent shaped body including pointed ends configured to facilitate draining of body waste captured in the prefilter. The ostomy pouch appliance may also include a protective panel configured to protect the filter assembly including at least one anti-reflux valve.