Spiral delivery system for embolic braid

Abstract

A device for treating an aneurysm with a braided implant can include a delivery tube having a spiral groove on an outer surface of the delivery tube and a braided implant having a spiral segment. The spiral segment can engage the spiral groove as the braided implant is delivered to an aneurysm treatment site. At the treatment site, the braided implant can be implanted, and the delivery tube can be rotated to disengage the spiral segment from the spiral groove. Once released, the spiral segment can reshape to occlude the neck of the aneurysm.

1 . A system comprising:
 a delivery tube configured to travel through vasculature and comprising a lumen therethrough, a distal end, an outer surface, and a helical structure on the outer surface;   a braided tubular implant movable from a delivery configuration to an implanted configuration,
 the delivery configuration comprising a tubular segment extending proximally within the lumen of the tubular delivery member and an outer fold segment covering a portion of the outer surface of the tubular delivery member, and 
 the implanted configuration comprising an occlusive sack comprising an opening; and 
   a coiled element movable from an engaging configuration to an occluding configuration upon rotation of the tubular delivery member in relation to the braided tubular implant,   wherein at least a portion of the coiled element is shaped in a circular helix shape and engages the helical structure when the coiled element is in the engaging configuration, and   wherein the portion of the coiled element shaped in the circular helix shape obstructs at least a portion of the opening of the occlusive sack when the coiled element is in the occluding configuration by forming a conical helix or a planar spiral.   
     
     
         2 . The system of  claim 1 , wherein the helical structure is an indentation in the shape of a circular helix. 
     
     
         3 . The system of  claim 1 ,
 wherein the coiled element comprises a memory shape metal, and   wherein the memory shape metal is configured to move from a deformed shape when the coiled element is engaged with the helical structure to a predetermined shape upon disengaging from the helical structure.   
     
     
         4 . The system of  claim 1 ,
 wherein the coiled element comprises an affixed portion affixed to the braided implant, and wherein the coiled element further comprises:   an affixed end affixed to the affixed portion of the coiled element;   a terminating end;   a first circumference measured along the coiled element from the affixed end through one turn of the conical helix in the direction of the terminating end; and   a second circumference measured along the coiled element from the terminating end through one turn of the conical helix in the direction of the affixed end, the second circumference measuring shorter than the first circumference.   
     
     
         5 . The system of  claim 4 , wherein the affixed portion is circular and has a circumference sized to fit over the outer surface of the delivery tube, and the coiled segment has a helical shape sized to engage the helical structure on the outside of the delivery tube. 
     
     
         6 . The system of  claim 4 , wherein the braided tubular implant inverts to form the occlusive sack and the coiled segment moves to obstruct the opening in the occlusive sack, and wherein the occlusive sack and the affixed portion of the coiled element are joined at the opening of the occlusive sack. 
     
     
         7 . The system of  claim 6 , wherein the affixed portion of the coiled element defines the opening of the occlusive sack and the coiled segment obstructs the opening of the occlusive sack. 
     
     
         8 . An implantation system comprising:
 a delivery tube comprising a lumen therethrough, a distal end, an outer surface, and a helical groove on the outer surface thereon; and   an implant comprising:
 a tubular braid movable to an implanted shape comprising an occlusive sack comprising an opening, and 
 a coiled element extending from the opening of the tubular braid, 
   wherein a portion of the coiled element shaped in a circular helix shape is positioned within the helical groove,   wherein the coiled element is configured, upon rotation of the delivery tube in relation to the tubular braid, to disengage from the helical groove and thereby disengage the implant from the delivery tube, and   wherein the portion of the coiled element shaped in the circular helix shape is configured to obstruct at least a portion of the opening of the occlusive sack of the tubular braid by forming a conical helix or a planar spiral upon disengaging from the helical groove.   
     
     
         9 . The implantation system of  claim 8 , wherein the helical structure is an indentation in the shape of a circular helix. 
     
     
         10 . The implantation system of  claim 8 ,
 wherein the coiled element comprises a memory shape metal, and   wherein the memory shape metal is configured to move from a deformed shape when the coiled element is engaged with the helical groove to a predetermined shape upon disengaging from the helical structure.   
     
     
         11 . The implantation system of  claim 8 ,
 wherein the coiled element comprises an affixed portion affixed to the braided implant, and wherein the coiled element further comprises:   an affixed end affixed to the affixed portion of the coiled element;   a terminating end;   a first circumference measured along the coiled element from the affixed end through one turn of the conical helix in the direction of the terminating end; and   a second circumference measured along the coiled element from the terminating end through one turn of the conical helix in the direction of the affixed end, the second circumference measuring shorter than the first circumference.   
     
     
         12 . The implantation system of  claim 11 , wherein the affixed portion is circular and has a circumference sized to fit over the outer surface of the delivery tube, and the coiled segment has a helical shape sized to engage the helical groove on the outside of the delivery tube. 
     
     
         13 . The implantation system of  claim 11 , wherein the braided tubular implant inverts to form the occlusive sack and the coiled segment moves to obstruct the opening in the occlusive sack, and wherein the occlusive sack and the affixed portion of the coiled element are joined at the opening of the occlusive sack. 
     
     
         14 . The implantation system of  claim 13 , wherein the affixed portion of the coiled element defines the opening of the occlusive sack, and the coiled segment obstructs the opening of the occlusive sack. 
     
     
         15 . A method comprising:
 collapsing a coiled element affixed to a braided implant within a helical groove on a delivery tube so that the coiled element is positioned over an outer surface of the delivery tube and releasable from the delivery tube upon rotation of the delivery tube in relation to the braided implant;   inserting a majority of the braided implant within a lumen of the delivery tube;   configuring the delivery tube and braided implant for delivery through vasculature;   moving the braided implant to an implanted shape comprising an opening from which the affixed portion and coiled element extend; and   disengaging the coiled element from the helical groove, thereby causing the coiled element to form a conical helix shape or planar spiral shape within the opening of the implanted shape and to obstruct the opening of the implanted shape.   
     
     
         16 . The method of  claim 15 , further comprising:
 shaping the coiled element such that the coiled element forms a conical helix shape or planar spiral shape upon disengaging from the helical groove.   
     
     
         17 . The method of  claim 15 , further comprising:
 forming the coiled element to comprise a memory shape metal configured to move from a deformed shape when the coiled element is positioned within the helical groove to a predetermined shape upon the coiled element disengaging from the helical groove.   
     
     
         18 . The method of  claim 15 , further comprising:
 pushing the majority of the braided implant distally from the lumen of the delivery tube.   
     
     
         19 . The method of  claim 18 , further comprising:
 inverting a tubular portion of the braided implant as the tubular portion is pushed distally from the lumen of the delivery tube.   
     
     
         20 . A method for treating an aneurysm, the method comprising:
 providing a braided implant delivery system comprising a braided implant comprising a coiled element affixed to the braided implant and a delivery tube comprising a spiral groove;   engaging the coiled element with the spiral groove;   implanting the braided implant in the aneurysm;   rotating the delivery tube in relation to the coiled element of the braided implant to disengage the coiled element from the spiral groove;   releasing the coiled element from the delivery tube which releases the braided implant from the delivery tube;   moving a portion of the coiled element from a circular helix shape to a conical helix shape or planar spiral shape; and   occluding at least portion of the neck of the aneurysm with the coiled element.