A kind of bracket (100) is with casing and radially distensible, and the ventilative structure of the cavity or the generally tubulose in channel that are sized and shaped to be suitable for residing in nasal sinus or nose is provided under expansion state, and there is the cross-sectional diameter being adapted for insertion into such cavity or channel in an unexpanded condition. The expansion and outward pressure that casing limitation is applied by the bracket, so as to prevent or reduce the generation of patients headache, and can provide increased surface area to improve elution of the drug to neighbouring mucosal tissue.
