Disclosed is a filter device, comprising a support structure (2) and a filter structure (1). The filter structure (1) comprises several support rods (10). At least one of the support rods (10) is a self-elasticity-type support rod, and the remaining support rods (10) are self-elasticity-type support rods or self-degradation-type support rods. First ends of all the support rods (10) are telescoped in an outer sleeve (14) to achieve a synthesized connection of the first ends of all the support rods (10), and second ends of all the support rods (10) are connected to the support structure (2), wherein the self-elasticity-type support rods are made of a shape memory material, the self-degradation-type support rods are made of a biodegradable material, and the outer sleeve (14) is composed of the shape memory material. The above-mentioned filter device is used. After completion of a thrombus treatment, the filter structure (1) is separated by stimulation of the external environment. The filter structure (1), after being separated, is close to a vessel wall or is completely degraded, which prevents the blocking of the blood flow by the filter structure (1) of the filter device retained in the human body when the filter device is not recovered, and reduces the risk of cracking occurring on the filter device or of puncturing blood vessels.La présente invention concerne un dispositif servant de filtre, comprenant une structure servant de support (2) et une structure servant de filtre (1). La structure servant de filtre (1) comprend plusieurs tiges de support (10). Au moins une des tiges de support (10) est une tige de support de type à auto-élasticité, et les autres tiges de support (10) sont des tiges de support de type à auto-élasticité ou des tiges de support de type à auto-dégradation. Les premières extrémités de toutes les tiges de support (10) sont montées de manière télescopique dans un manchon extérieur (14) afin dobtenir une liaison synthétisée des premières extrémit
