Patent ID: 7651488

Claim:
A microcatheter comprising: a single layer microcatheter having a proximal portion and a distal end portion; said proximal portion having an outside diameter of about 3 millimeters; said proximal portion extending to within a range of about 30 cm to about 20 cm from a distal end of said microcatheter; said distal end portion having an outside diameter between about 0.67 millimeters and about 1.0 millimeters; a taper from said outside diameter of said proximal portion to said outside diameter of said distal end portion; a lumen of substantially constant diameter, said lumen diameter being in a range between about 14 mils and about 22 mils; and whereby when said catheter is inserted into a human cranial arterial tree having narrowing in at least two of a first order branch, a second order branch and a third order branch, said catheter is positionable to therapeutically dilate said narrowing in at least one of said first, second or third order branches, and to simultaneously therapeutically dilate said narrowing in at least one other of the said first, second or third order branches, and said therapeutic dilation dilating the vessels to a healthier diameter.