Implant for insertion into body cavities, in particular blood vessels, preferably aneurysms, comprising at least one fibre (2) by means of which a coagulation of blood can be brought about, wherein the implant comprises at least one driving element (1) which can be formed into a first shape and which can be converted from the first shape automatically into a second, in particular relaxed shape by a mechanical stress which is applied to the element in the first shape, and the implant comprises at least one driven fibre (2), in particular a multiplicity of driven fibres (2), and a respective driven fibre (2) with regions which are spaced apart in the direction of extent of the fibre is attached to the at least one driving element (1) in regions which are at a different position with respect to one another, in particular at a larger distance from one another, in the first shape than in the second shape, and the at least one driven fibre (2), preferably the multiplicity of driven fibres (2), is driven by the driving element (1) to change its shape with the conversion of the driving element (1) from the first shape into the second shape.
