Living body indwelling object

A living body indwelling object configured to be positioned in a living body lumen in a living body, the living body indwelling object comprising:

• the combination of a stent and a porous structure;
• the stent being an expandable tubular stent having a longitudinal extent and being expandable from a reduced diameter state to an expanded state when the tubular stent is positioned in the living body lumen, the tubular stent having an outwardly facing part;
• the porous structure having through openings, the porous structure being positioned in covering relation to the tubular stent so that the porous structure surrounds the tubular stent and so that an inwardly facing part of the porous structure faces the outwardly facing part of the tubular stent, with the porous structure being urged against an inner surface of the living body lumen blood vessel by the tubular stent when the tubular stent is expanded from the reduced diameter state to the expanded state while positioned in the living body lumen;
• the porous structure being made of a first biodegradable polymer that is decomposable when the living body indwelling object is positioned in the living body lumen;
• the outwardly facing part of the tubular stent that faces the inwardly facing part of the porous structure made of the first biodegradable polymer including a drug carrying portion that is decomposable when the living body indwelling object is positioned in the living body lumen, the drug carrying portion containing both a second biodegradable polymer and a drug;
• and
• the porous structure and the tubular stent being configured so that:
• i) a decomposition time of the porous structure is substantially the same as a decomposition time of the drug carrying portion;
• or ii) the decomposition time of the porous structure is shorter than the decomposition time of the drug carrying portion.