Aneurysm device and delivery system

Abstract

The present disclosure relates to a method of occluding an aneurysm, including expanding, in an aneurysm, a first radially expandable mesh segment of an expandable braid by distally moving the braid from a collapsed state within a microcatheter to a deployed state distal of the microcatheter within the aneurysm, the first radially expandable mesh segment comprising a proximal end and an open distal end, wherein in the deployed state the first radially expandable mesh segment comprises an outer occlusive sack in the aneurysm that is sealable against a neck of the aneurysm; and further distally pushing the braid, as the outer occlusive sack is forming, thereby expanding a second radially expandable mesh segment inside of the outer occlusive sack to form an inner occlusive sack in the outer occlusive sack in the deployed state.

What is claimed is: 
     
         1 . A method of occluding an aneurysm, comprising:
 expanding, in an aneurysm, a first radially expandable mesh segment of an expandable braid by distally moving the braid from a collapsed state within a microcatheter to a deployed state distal of the microcatheter within the aneurysm, the first radially expandable mesh segment comprising a proximal end and an open distal end, wherein in the deployed state the first radially expandable mesh segment comprises an outer occlusive sack in the aneurysm that is sealable against a neck of the aneurysm; and   further distally pushing the braid, as the outer occlusive sack is forming, thereby expanding a second radially expandable mesh segment inside of the outer occlusive sack to form an inner occlusive sack in the outer occlusive sack in the deployed state.   
     
     
         2 . The method of  claim 1 , further comprising:
 radially expanding an inner layer of the braid inside of the outer occlusive sack to radially expand inside the outer occlusive sack to form the inner occlusive sack.   
     
     
         3 . The method of  claim 2 , further comprising:
 forming the inner layer by folding the proximal end over a marker band positioned on or adjacent the proximal end of the braid.   
     
     
         4 . The method of  claim 1 , wherein proximal ends of each mesh segment are aligned with each other in both the collapsed and deployed states. 
     
     
         5 . The method of  claim 1 , wherein the distal ends of each expandable mesh segment being positioned on equivalent sides opposite the proximal ends of each sack in both the collapsed and deployed states. 
     
     
         6 . The method of  claim 1 , further comprising:
 deflecting, diverting or slowing flow into the aneurysm across the neck of the aneurysm when the outer occlusive sack is formed across the neck and the inner occlusive sack is formed therein.   
     
     
         7 . The method of  claim 1 , further comprising:
 forming the first radially expandable mesh segment with a porosity lower than a porosity of the second radially expandable mesh segment.   
     
     
         8 . The method of  claim 1 , the first radially expandable mesh segment comprising fewer wire segments than the second radially expandable mesh segment. 
     
     
         9 . The method of  claim 1 , further comprising:
 positioning the first radially expandable mesh segment adjacent the neck of the aneurysm.   
     
     
         10 . The method of  claim 1 , further comprising:
 detaching the expandable braid, by a delivery system, in the aneurysm.   
     
     
         11 . The method of  claim 10 , the delivery system comprising:
 a microcatheter; and   a delivery tube comprising a distal end and a proximal end, the distal end of the delivery tube being detachably connected to the proximal end of the braid, the delivery tube being translatably disposable within the microcatheter;   wherein the delivery tube is capable of distally translating the braid within the microcatheter from a collapsed state to a deployed state.   
     
     
         12 . The method of  claim 1 , further comprising:
 varying dimensions of interstices of the braid at the proximal end versus the distal end so that a porosity of the outer occlusive sack is less than a porosity of the inner occlusive sack when positioned across the neck of the aneurysm.   
     
     
         13 . A method of delivering an occlusive device to an aneurysm, comprising:
 distally pushing a braid, by a delivery tube, into the aneurysm whereby a first radially expandable segment of the braid radially expands to form an outer occlusive sack;   distally pushing the braid thereby expanding a second radially expandable segment inside of the outer occlusive sack as the outer occlusive is forming while distally pushing the outer occlusive sack against the aneurysm wall; and   releasing the braid in the aneurysm.   
     
     
         14 . The method of  claim 13 , further comprising:
 forming the first radially expandable segment with a porosity lower than a porosity of the second radially expandable segment.   
     
     
         15 . The method of  claim 13 , further comprising:
 positioning the first radially expandable segment adjacent a neck of the aneurysm.   
     
     
         16 . The method of  claim 13 , further comprising:
 sealing the outer occlusive sack against the neck of the aneurysm.   
     
     
         17 . The method of  claim 13 , further comprising:
 positioning a marker band in communication with the proximal end of the braid.   
     
     
         18 . The method of  claim 17 , further comprising:
 forming an inner layer of the inner occlusive sack by folding the proximal end over the marker band.   
     
     
         19 . The method of  claim 13 , wherein the step of releasing is performed by a delivery system, comprising:
 a microcatheter; and   a delivery tube comprising a distal end and a proximal end, the distal end of the delivery tube being detachably connected to the proximal end of the braid, the delivery tube being translatably disposable within the microcatheter;   wherein the delivery tube is capable of distally translating the braid within the microcatheter from a collapsed state to a deployed state.