Integral vascular filter system with core wire activation
First Claim
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1. A vascular filter system for insertion into a lumen of a vessel, said vascular filter system comprising:
- a) a multi-filament guidewire having an outer diameter and an inner diameter, a distal end and a proximal end, a distal portion and a proximal portion;
b) a prescribed filter shape in said distal portion of said guidewire, said prescribed filter shape comprising said multi-filaments of said distal portion of said guidewire;
said prescribed filter shape having a proximal end, a midpoint and a distal end, a smaller first diameter for insertion into said lumen of said vessel, and a larger second diameter for expanding to substantially equal the diameter of said lumen and to be placed in generally sealing relationship with said lumen;
c) a porous covering having a distal end and a proximal end, with said distal end of said porous covering attached near said distal end of said prescribed filter shape, and said proximal end of said porous covering attached near said midpoint of said prescribed filter shape, and;
d) a generally solid actuating core wire for causing said prescribed filter shape to move between said smaller first diameter, and said larger second diameter, said core wire having a proximal end and a distal end, wherein said distal end of said prescribed filter shape is attached near said distal end of said core wire, and said guidewire is coaxially disposed around said core wire.
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Abstract
A integral vascular filter system comprising a multi-filament guidewire and an integral filter which may be used to capture embolic particulates during medical procedures, while allowing for continuous perfusion of blood. Filter activation is achieved via the use of a central core wire. The vascular filter system addresses the clinical problem of minimizing profile or diameter, so as to enable or facilitate the crossing of a lesion or obstruction in the vessel.
247 Citations
26 Claims
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1. A vascular filter system for insertion into a lumen of a vessel, said vascular filter system comprising:
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a) a multi-filament guidewire having an outer diameter and an inner diameter, a distal end and a proximal end, a distal portion and a proximal portion;
b) a prescribed filter shape in said distal portion of said guidewire, said prescribed filter shape comprising said multi-filaments of said distal portion of said guidewire;
said prescribed filter shape having a proximal end, a midpoint and a distal end, a smaller first diameter for insertion into said lumen of said vessel, and a larger second diameter for expanding to substantially equal the diameter of said lumen and to be placed in generally sealing relationship with said lumen;
c) a porous covering having a distal end and a proximal end, with said distal end of said porous covering attached near said distal end of said prescribed filter shape, and said proximal end of said porous covering attached near said midpoint of said prescribed filter shape, and;
d) a generally solid actuating core wire for causing said prescribed filter shape to move between said smaller first diameter, and said larger second diameter, said core wire having a proximal end and a distal end, wherein said distal end of said prescribed filter shape is attached near said distal end of said core wire, and said guidewire is coaxially disposed around said core wire. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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13. A method for capturing embolic particulates within the lumen of a vessel during a medical procedure, while allowing for continuous perfusion of blood, comprising the steps of:
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a) providing a multi-filament guidewire having an outer diameter and an inner diameter, a distal portion and a proximal portion, with a prescribed filter shape in said distal portion of said guidewire;
said prescribed filter shape comprising said multi-filaments of said distal portion of said guidewire, said prescribed filter shape having a proximal end, a midpoint and a distal end, a smaller first diameter for insertion into a vessel, and a second larger diameter for expanding to substantially equal the diameter of said lumen and to be placed in generally sealing relationship with said lumen;
a porous covering having a distal end and a proximal end, with said distal end of said porous covering attached near said distal end of said prescribed filter shape, and said proximal end of said porous covering attached near said midpoint of said prescribed filter shape; and
a generally solid actuating core wire for causing said prescribed filter shape to move between said smaller first diameter, and said larger second diameter;
said core wire having a proximal end and a distal end, wherein said distal end of said prescribed filter shape is attached near said distal end of said core wire, and said guidewire is coaxially disposed around said core wire;
b) inserting said guidewire into said lumen of said vessel until said distal portion of said guidewire is positioned past an occlusion in said vessel;
c) retracting said actuating core wire to cause said distal portion of said guidewire to achieve said larger second diameter and said prescribed shape;
d) advancing additional devices over said guidewire, and positioning said devices at the site of said occlusion in said vessel;
e) performing additional procedures to therapeutically treat said occlusion in said vessel;
f) capturing embolic particulates generated by said procedures, in said porous covering on said distal portion of said guidewire;
g) removing said additional devices from said guidewire;
h) advancing said actuating core wire to cause said distal portion of said guidewire to achieve said smaller first diameter; and
i) removing said guidewire from said lumen of said vessel, with said embolic particulates captured in said porous covering.
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14. For use with a guidewire-based vascular filter system, the improvement comprising:
a core wire coaxially disposed within said guidewire, wherein said core wire is placed in tension to deploy said vascular filter.
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15. A vascular filter system for insertion into a lumen of a vessel, said vascular filter system comprising:
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(a) a multi-filament guidewire having an outer diameter and an inner diameter, a distal end and a proximal end;
(b) a prescribed filter shape near said distal end of said guidewire, said prescribed filter shape comprising said multi-filaments of said guidewire;
saidprescribed filter shape having a proximal end, and a distal end, a smaller first diameter for insertion into said lumen of said vessel, and a larger second diameter for expanding to substantially equal the diameter of said lumen and to be placed in generally sealing relationship with said lumen;
(c) a porous covering attached near said distal end of said prescribed filter shape, and;
(d) a generally solid actuating core wire for causing said prescribed filter shape to move between said smaller first diameter, and said larger second diameter, wherein said guidewire is coaxially disposed around said core wire.
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Specification