devices for nasal insertion may include an open - ended tubular element which extends along a central tube axis between a first end and a second end , the first end being larger than the second end , and in which the tubular element includes at least one spiral strut extending from the first end to the second end , and / or a nodule having an internal face , a rounded external face , and a stalk extending from the internal face and terminating in an anchor sufficiently larger than a receptacle in the tubular element and sufficiently deformable as to be pressed through the receptacle to affix the nodule to the tubular element .