Embolization devices and methods of manufacturing the same

There is provided an embolization device for promoting clot formation in a bodily lumen and having a contracted delivery 5 configuration and an expanded deployed configuration, the embolization device comprising: a stem (210) comprising a tube having a tube wall (211) and a plurality of holes in the tube wall (211); and a plurality of flexible bristles (220) extending radially outwardly from the tube, wherein each hole 10 has at least one of the plurality of flexible bristles (220) penetrating through the tube wall. A filler material (212) or a securing device may be disposed within a lumen of the tube to secure the at least one of the plurality of flexible bristles to the tube. Fig. 4 to accompany abstract WO 2020/211943 PCT/EP2019/060106 120b