Patent ID: 9585668
Date: 2017-03-07
CPC Classifications: A61B,A61F

Claim:
1. A medical device for insertion into a bodily vessel to treat an intracranial aneurysm, the device comprising: a mechanically expandable device, expandable from a first position to a second position such that, in the second position, an exterior surface of the mechanically expandable device engages with an inner surface of the vessel so as to maintain a fluid pathway through the vessel, the mechanically expandable device comprising a plurality of circumferential rings, a plurality of first longitudinal struts, and a plurality of second longitudinal struts, wherein each of the first longitudinal struts connects only two axially adjacent circumferential rings, and wherein each of the second longitudinal struts connects three axially adjacent circumferential rings, such that at least one of the first longitudinal struts is circumferentially adjacent to at least one of the second longitudinal struts, wherein the mechanically expandable device comprises a region bounded by a pair of boundary lines extending only longitudinally from a proximal end of the mechanically expandable device to a distal end of the mechanically expandable device, wherein a total number of the first longitudinal struts in the region exceeds a total number of the second longitudinal struts in the region; and a porous membrane, expandable in response to expansion of the mechanically expandable device; wherein at least a portion of the membrane is secured to the mechanically expandable device, such that a proximal end of the membrane is proximate to the proximal end of the mechanically expandable device, and a distal end of the membrane is proximate to the distal end of the mechanically expandable device; and wherein the membrane has a substantially uniform porosity over a length extending from the distal end of the membrane to the proximal end of the membrane, the membrane having pores with a size between about 20 microns and about 100 microns and a distance between adjacent pores of the membrane being less than 75 microns, the membrane having a width that is less than 0.001 inches; and wherein, when the mechanically expandable device is expanded in the bodily vessel, adjacent to the aneurysm, the membrane is configured to: