Guidewire having hydrophilic coating
First Claim
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1. A guidewire comprising:
- a core wire having a proximal end and a distal end;
a coil disposed over a distal portion of the core wire, wherein the coil comprises a helically wound filament having a plurality of successive turns spaced-apart by a distance of from 15% to 50% of the width of the filament; and
a polymeric coating bridging the space between successive turns of the helical filament of the coil, wherein said space allows the coating to flex and accommodate bending of the coil without significant loss of pliability.
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Abstract
A guidewire comprises a core wire having a coil tip at its distal end. The coil tip includes a helically wound filament having adjacent turns spaced apart by a preselected distance. The guidewire is coated with a polymeric material, typically a hydrophilic polysaccharide, such as hyaluronic acid or chondroitin sulfate. By properly selecting the spacing between adjacent turns of the coil tip, the hydrophilic coating will adhere to the coil tip in a manner which does not penetrate the coil and which does not significantly interfere with flexibility and bendability of the coil tip.
115 Citations
8 Claims
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1. A guidewire comprising:
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a core wire having a proximal end and a distal end; a coil disposed over a distal portion of the core wire, wherein the coil comprises a helically wound filament having a plurality of successive turns spaced-apart by a distance of from 15% to 50% of the width of the filament; and a polymeric coating bridging the space between successive turns of the helical filament of the coil, wherein said space allows the coating to flex and accommodate bending of the coil without significant loss of pliability. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification