An end fitting (31) is formed at the patient end of an inner cannula (3) for a tracheostomytube (1) by punching small holes (33) close to one end (34) of an ePTFE shaft (30).The end is then swaged to form an expanded region (30') and a preformed tubularinsert (40) of a thermoplastic material is inserted to cover the holes (33) onthe inside. An outer part (46) of the same thermoplastic material is then overmouldedon the outside of the shaft 30 so that its material (47) flows through the holes(33) and bonds with the inner insert (40), thereby securing the inner and outerparts together around the end of the shaft.
