Intrasaccular device positioning and deployment system

Abstract

Implant deployment systems can generally include a braided implant that can be detachably attached to a delivery tube by an expansion ring that can be positioned within a notch on an outer surface of the delivery tube near a distal end of the delivery tube. The implant can be positioned within a lumen of the delivery tube and remain attached to the delivery tube as the assembly is fed through a microcatheter to a treatment site. Once the braided implant is implanted, the expansion ring can move from a collapsed configuration that is engaged with the notch of the delivery tube to a deployed configuration that releases the delivery tube, thereby releasing the braided implant from the delivery tube.

1 . A method for treating an aneurysm, the method comprising:
 providing a braided implantation delivery system, wherein the braided implantation delivery system comprises a braided implant, a delivery tube comprising a notch, and an expansion component;   attaching the braided implant to the expansion component;   engaging the expansion component with the notch;   implanting the braided implant in the aneurysm;   expanding the expansion component to disengage the expansion component from the notch; and   releasing the expansion component from the delivery tube which releases the braided implant from the delivery tube.   
     
     
         2 . The method of  claim 1  further comprising the step of expanding the expansion component to occlude at least a portion of the neck of the aneurysm. 
     
     
         3 . The method of  claim 1 , wherein the step of implanting the braided implant in the aneurysm comprises the step of forming an occlusive sack, and
 wherein the step of expanding the expansion component comprises the step of extending the occlusive sack across the neck of the aneurysm.   
     
     
         4 . The method of  claim 1 , wherein the expansion component is in a collapsed configuration when engaged with the notch and in a deployed configuration when released from the notch. 
     
     
         5 . The method of  claim 1 , wherein the braided implantation delivery system further comprises an inner elongated member, the method further comprising the step of attaching the braided implant to the inner elongated member. 
     
     
         6 . The method of  claim 5 , wherein the step of implanting the braided implant in the aneurysm further comprises the steps of:
 pushing the inner elongated member distally, thereby pushing a portion of the braided implant into the aneurysm; and   detaching the braided implant from the inner elongated member.   
     
     
         7 . The method of  claim 6  further comprising retracting and repositioning the braided implant within the aneurysm by one or both of pushing and pulling the inner elongated member. 
     
     
         8 . The method of  claim 6  further comprising pushing the inner elongated member distally such that the braided implant inverts to form an occlusive sack. 
     
     
         9 . The method of  claim 6 , wherein a portion of the braided implant does not invert to form the occlusive sack and is pushed into the occlusive sack to form an embolic filler braid. 
     
     
         10 . The method of  claim 9 , wherein the embolic filler braid is detachably attached to the inner elongated member. 
     
     
         11 . The method of  claim 10  further comprising partially or fully retracting the braided implant from the aneurysm by pulling the inner elongated member proximally, thereby allowing repositioning of the braided implant. 
     
     
         12 . The method of  claim 10  further comprising pushing the inner elongated member distally to re-implant the braided implant. 
     
     
         13 . The method of  claim 1  wherein the braided implant comprises:
 a fold positioned distal the distal end of the delivery tube; 
 an outer fold segment extending proximally from the fold and comprising the second end of the braided implant; and 
 an inner fold segment encompassed by the outer fold segment, extending proximally from the fold, and comprising the first end of the braided implant. 
 
     
     
         14 . The method of  claim 13 , wherein the expansion component is mechanically connected to a portion of the outer fold segment, the outer fold segment covering at least a portion of the notch and at least a portion of the expansion ring. 
     
     
         15 . The method of  claim 4 , wherein the deployed configuration of the expansion component comprises:
 an attaching segment attached to the braided implant and opening a first region of the occlusive sack to a first circumference; and   an extending portion attached to the attaching segment and opening a second region of the occlusive sack to a second circumference greater than the first circumference.   
     
     
         16 . The method of  claim 4 , wherein the expansion component comprises a plurality of leaf shaped elements that extend radially as the expansion component moves from the collapsed configuration to the deployed configuration. 
     
     
         17 . The method of  claim 4 , wherein the expansion component in the collapsed configuration comprises a plurality of segments joined to form a substantially tubular zig-zag structure. 
     
     
         18 . The method of  claim 13 , wherein the delivery tube further comprises a lumen therethrough and the inner fold segment of the braided implant is positioned within the lumen. 
     
     
         19 . The method of  claim 1 , wherein the notch comprises a circumferential indentation on the exterior of the tubular delivery member. 
     
     
         20 . The method of  claim 1 , wherein the expansion component is positioned in the circumferential indentation when in a collapsed configuration.