A non-sterile device designed as a filter for protecting a stomal opening in the windpipe (surgically-created artificial opening between the trachea and the body surface through which the patient can breathe) against harmful external influences. It may also function as a heat & moisture exchanger (HME) intended to capture the patient's exhaled breath so that it can be used to warm and moisten inspired air to help keep the trachea lubricated and prevent its mucosa from drying. It is typically designed as a hydrophobic foam filter of various sizes held in place with an adhesive strip. This is a single-use device changed regularly according to the manufacturer's instructions.
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