An embolization microcatheter having an elongated microcatheter body configured for passing therein a suspension of particles suspended in a suspension fluid； and a microcatheter head connected to a distal end of said microcatheter body and comprising a proximal head section and a distal head section, wherein the proximal head section includes a proximal wall forming a proximal section lumen, the proximal wall having a plurality of through-holes, wherein the distal head section includes a distal wall forming a distal section lumen, and a suspension delivery opening at a distal end of the distal end section； wherein the distal section is devoid of through-holes, and wherein each of the plurality of through-holes are shaped and/or sized to allow passage therethrough of the suspension fluid while blocking passage of the particles suspended therein.
