Intraluminal filter
First Claim
1. An intraluminal filter positionble within a lumen for separating particles from a fluid flowing within said lumen, said intraluminal filter comprising:
- a first plurality of filamentary members formed of a flexible, resilient material and interlaced in a relatively open mesh to form a basket, said first filamentary members elastically deforming said basket from a first shape state having a first diameter sized to allow said basket to slidingly fit within the bore of a catheter positionable within said lumen, to a second shape state having a second diameter substantially larger than said first diameter and sized to allow said basket to sealingly interfit within said lumen, said basket being biased by internal elastic forces within said first filamentary members to assume said second shape state when released from said catheter;
a second plurality of filamentary members interlaced with one another and with said first filamentary members to form a concave first portion of said basket, said basket having a second portion remaining unobstructed and arranged facing said concave first portion, said relatively open mesh having openings sized to allow said fluid and said particles to flow through said second portion into said concave first portion when said second portion is oriented upstream within said lumen, said concave first portion comprising a filter element having second openings of predetermined size smaller than the first named openings, said second openings being sized to capture entrained particles while allowing said fluid to flow therethrough.
1 Assignment
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Accused Products
Abstract
An intraluminal filter for vascular use during medical procedures is disclosed. The filter is formed of a plurality of flexible, resilient monofilament wires interbraided in a relatively open mesh forming a basket with a plurality of multifilament yarns braided in a relatively closed mesh having a predetermined porosity forming a filter element. The filter element is positioned distally of the basket forming a concave portion, the remaining portion of the basket being unobstructed and forming openings facing the concave portion. The filter is elastically deformable between two shape states, the first having a small diameter enabling the filter to slide within the bore of a catheter for positioning the filter in the lumen of an artery, the second shape state having a substantially larger diameter sized to sealingly interfit within the artery lumen. The filter is biased and will expand upon release from the catheter to the second shape state. The open portion is positioned upstream allowing blood to flow into the concave portion of the filter element, particles above a certain size being captured in the filter while blood is allowed to flow through. A tether is attached to the upstream end of the filter allowing it to be withdrawn into the catheter bore for removing the filter from the artery.
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Citations
23 Claims
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1. An intraluminal filter positionble within a lumen for separating particles from a fluid flowing within said lumen, said intraluminal filter comprising:
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a first plurality of filamentary members formed of a flexible, resilient material and interlaced in a relatively open mesh to form a basket, said first filamentary members elastically deforming said basket from a first shape state having a first diameter sized to allow said basket to slidingly fit within the bore of a catheter positionable within said lumen, to a second shape state having a second diameter substantially larger than said first diameter and sized to allow said basket to sealingly interfit within said lumen, said basket being biased by internal elastic forces within said first filamentary members to assume said second shape state when released from said catheter;
a second plurality of filamentary members interlaced with one another and with said first filamentary members to form a concave first portion of said basket, said basket having a second portion remaining unobstructed and arranged facing said concave first portion, said relatively open mesh having openings sized to allow said fluid and said particles to flow through said second portion into said concave first portion when said second portion is oriented upstream within said lumen, said concave first portion comprising a filter element having second openings of predetermined size smaller than the first named openings, said second openings being sized to capture entrained particles while allowing said fluid to flow therethrough. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An intraluminal filter for trapping and retaining particles entrained in a fluid flowing within a lumen, said filter comprising:
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an elastically deformable basket formed of a plurality of flexible, resilient filamentary members interlaced in a relatively open mesh of a size allowing flow of said fluid and said particles therethrough, said basket being elastically radially compressible to a first shape state having a first predetermined diameter sized to slidingly interfit within a catheter positionable within said lumen, and being radially expandible to a second shape state having a second predetermined diameter larger than the first to sealingly interfit within said lumen, said basket being biased by elastic forces of said filamentary members to nominally assume said second shape state, and being elastically and repeatably deformable between said shape states;
said basket having a relatively open first portion and filter means disposed opposite to said first portion, said filter means having a concave surface of predetermined porosity facing said first portion for capturing said particles when said basket is in said second shape state and positioned in said lumen with said first portion arranged upstream of said filter means. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A method of forming an intraluminal filter comprising the steps of:
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braiding a plurality of flexible, resilient filamentary members into a relatively open mesh forming an elastically deformable tube, said filamentary members providing a radial bias to said tube, urging said tube to assume a predetermined length and diameter;
interbraiding a multiplicity of yarns with said first filamentary members to form with said filamentary members a surface having a predetermined porosity;
gathering each end of said tube and cinching each said end together to form an elastically deformable basket;
removing said yarns from a portion of said basket at one end of said tube thereby forming openings at said one end; and
attaching said yarns to said first filamentary members adjacent to said portion of said basket. - View Dependent Claims (22, 23)
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Specification