Device for treating an aneurysm by means of coagulation, which has an insertion element (6), a filament (8, 18, 28, 38), which can be inserted into the bag (4) of this aneurysm and wound there on itself , and a means (19) for introducing said filament into the bag (4) through the introduction element (6), characterized in that: - the introduction element (6) comprises a valve and a removable needle (7); - the filament (8, 18, 28, 38) comprises a wire (30) of a metal with shape memory treated to have a transformation threshold below the temperature of the human body so that it has a substantially rectilinear shape at temperature environment and a substantially wound shape at the temperature of the human body; - the filament (8, 18, 28, 38) that is held by its proximal end so that it can be removed from the bag (4) after a defined time.
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