Laser cut catheters for vascular embolization

A catheter system for embolizing a middle meningeal artery (MMA), the system comprising:

• an exterior catheter comprising
• a laser cut tube (LCT) having a lumen and a plurality of first cuts, wherein the plurality of first cuts comprises a plurality of first interrupted spiral cuts, and
• a cut filler comprising a polymer, wherein the polymer is configured to fill the plurality of the first cuts;
• and
• an interior catheter comprising
• a LCT having a plurality of second cuts, wherein the plurality of second cuts comprises a plurality of second interrupted spiral cuts, and
• a cut filler comprising a polymer, wherein the polymer is configured to fill the plurality of second cuts, wherein the interior catheter is configured to extend within the lumen of the exterior catheter,
• wherein the exterior catheter has an outer diameter at a distal portion of at most about 0.04 inch,
• wherein the interior catheter has an outer diameter at a distal portion of at most about 0.03 inch, and
• wherein a ratio of the outer diameter at the distal portion of the interior catheter to an outer diameter of a proximal portion of the interior catheter is between about 0.8 and about 1.2.