Bag for use in the intravascular treatment of saccular aneurysms
First Claim
1. A flexible bag adapted to pass through a catheter lumen and expand to substantially occupy a fluid-filled cavity larger than said lumen, said bag being adapted to receive fluid within said cavity and a clotting medium for contact with said fluid, said bag comprising a plurality of interlaced flexible filamentary members, said filamentary members being spaced apart to form a multiplicity of pores, said pores being sized to allow said fluid to enter said bag but prevent outward extension of said clotting medium, said filamentary members being resiliently biased to expand said bag to a first diameter substantially filling said cavity upon release from said catheter lumen, said filamentary members being resiliently deformable to allow for contraction of said bag to a second diameter smaller than said first diameter, said bag being sized to slidingly interfit within said catheter lumen when contracted to said second diameter.
1 Assignment
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Accused Products
Abstract
A bag for use in the intravascular treatment of saccular aneurysms and a method of forming the bag are disclosed. The bag is formed from a plurality of flexible, resilient filamentary members braided into a tubular sleeve and biased into a first shape having an expanded first diameter sized to substantially fill the aneurysm. The bag is resiliently deformable into a second shape having a diameter smaller than the first and sized to slidingly interfit within the lumen of a catheter. An opening is provided in the bag to receive a clotting medium, such as a platinum wire, on which blood clots can be induced to form by mechanical or electrolytic means. The opening is urged to a closed position by resiliently biasing the filamentary members. In use the, bag is inserted into a saccular aneurysm via the catheter and expands to its first diameter upon release therefrom. Interstices between the interbraided filamentary members provide pores allowing blood from the aneurysm to enter the bag when the bag is positioned within the aneurysm. The clotting medium wire is packed into the bag, blood clots on the wire and occludes the aneurysm, sealing it off from the blood stream and preventing rupture. The wire is released from the catheter and is contained within the bag in the aneurysm.
336 Citations
30 Claims
- 1. A flexible bag adapted to pass through a catheter lumen and expand to substantially occupy a fluid-filled cavity larger than said lumen, said bag being adapted to receive fluid within said cavity and a clotting medium for contact with said fluid, said bag comprising a plurality of interlaced flexible filamentary members, said filamentary members being spaced apart to form a multiplicity of pores, said pores being sized to allow said fluid to enter said bag but prevent outward extension of said clotting medium, said filamentary members being resiliently biased to expand said bag to a first diameter substantially filling said cavity upon release from said catheter lumen, said filamentary members being resiliently deformable to allow for contraction of said bag to a second diameter smaller than said first diameter, said bag being sized to slidingly interfit within said catheter lumen when contracted to said second diameter.
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21. A flexible expandable bag defining an enclosed space, said bag being adapted to pass through a catheter lumen for insertion into a blood-filled saccular vascular aneurysm, said bag being expandable upon passage from said catheter lumen into said saccular aneurysm and being porous to allow for the passage of blood within the aneurysm and containing a length of wire in contact with said blood for promoting clotting, clotted blood substantially filling said enclosed space and sealing off said aneurysm, said bag comprising:
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a plurality of interlaced flexible filamentary members shaped to form said enclosed space, said filamentary members being resiliently biased to assume a first shape state wherein said bag is expanded to a first diameter sized to substantially fill said aneurysm, said filamentary members being resiliently deformable to a second shape state wherein said bag is collapsed to a second diameter smaller than said first diameter and sized to slidingly interfit within said catheter lumen, said resilient biasing of said filamentary members expanding said bag to said first diameter upon release from said catheter lumen into said aneurysm;
an opening in said bag for passage of said wire into said enclosed space, said filamentary members having end portions biased to constrict said opening and preventing said wire from extending outwardly therefrom, said end portions being resiliently deformable to expand said opening to allow access to said enclosed space. - View Dependent Claims (22, 23, 24, 25)
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26. A method of forming a flexible bag defining an enclosed space and adapted to fit within a catheter lumen and expand to substantially occupy a blood-filled saccular vascular aneurysm, said enclosed space adapted to receive said blood and a clotting medium for promoting clotting, said method comprising the steps of:
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braiding a plurality of flexible resilient filamentary members into a resiliently deformable tube of predetermined length and predetermined first diameter sized to substantially fill said aneurysm, said tube having open ends oppositely arranged;
biasing said filamentary members into a first shape state substantially maintaining said tube in a radially expanded shape at said first diameter, said filamentary members being resiliently deformable into a second shape state wherein said tube is collapsed to a second diameter smaller than said first and sized to slidingly interfit within said catheter lumen;
biasing said filamentary members radially inwardly at said ends to form constrictions substantially closing off said ends, said filamentary members being resiliently deformable radially outwardly of said tube providing an opening for access to said enclosed space for receiving said clotting medium therein. - View Dependent Claims (27, 28, 29, 30)
interbraiding a plurality of radiopaque monofilament wires with said filamentary members forming said tube;
biasing said wires into said first shape state, said wires being resiliently deformable into said second shape state;
said wires being resiliently collapsible to said second diameter and interfitting within said catheter lumen, said wires pushing radially outwardly to support said bag when expanded to said first diameter upon release from said catheter.
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30. A method of forming a flexible bag according to claim 26, further comprising the step of positioning said bag within the lumen of a catheter, said bag being collapsed to said second diameter to slidingly interfit within said lumen.
Specification