Super elastic alloy guidewire
First Claim
1. A guidewire suitable for guiding a catheter within a body lumen, comprising an elongated, flexible metal wire core of a super-elastic alloy having a UP of 75 ksi±
- 10 ksi, an LP of 25 ksi±
7.5 ksi measured at 3% strain and a RS of less than 0.25% where measured in a stress-strain test to 6% strain, in which at least a portion of the guidewire is coated with a polymeric material and additionally comprising a tie layer disposed between the polymeric layer and the guidewire core.
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Accused Products
Abstract
This invention is a surgical device. It is a guidewire for use in a catheter and is used for accessing a targeted site in a lumen system of a patient'"'"'s body. The guidewire may be of a high elasticity metal alloy, preferably a Ni-Ti alloy, having specified physical parameters, and is especially useful for accessing peripheral or soft tissue targets. A special variation of the inventive guidewire includes the concept of coating the wire with a one or more lubricious polymers to enhance its suitability for use within catheters and with the interior of vascular lumen. The "necked" guidewire tip also forms a specific variant of the invention.
651 Citations
41 Claims
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1. A guidewire suitable for guiding a catheter within a body lumen, comprising an elongated, flexible metal wire core of a super-elastic alloy having a UP of 75 ksi±
- 10 ksi, an LP of 25 ksi±
7.5 ksi measured at 3% strain and a RS of less than 0.25% where measured in a stress-strain test to 6% strain, in which at least a portion of the guidewire is coated with a polymeric material and additionally comprising a tie layer disposed between the polymeric layer and the guidewire core. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
- 10 ksi, an LP of 25 ksi±
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26. A guidewire suitable for guiding a catheter within a blood vessel, comprising an elongated flexible metal wire core having a distal section including a necked down portion having a diameter smaller than a linearly contiguous section just distal of the necked down portion;
- an outer coil surrounding at least a portion of the distal section, such portion of the distal section comprising at least the smaller diameter portion; and
a metallic ribbon securing the outer coil to the smaller diameter portion of the distal section. - View Dependent Claims (27, 28, 29, 30, 31, 38)
- an outer coil surrounding at least a portion of the distal section, such portion of the distal section comprising at least the smaller diameter portion; and
- 32. A guidewire suitable for guiding a catheter within a blood vessel, comprising an elongated flexible metal wire core of a super-elastic alloy having a tie layer disposed about at least a portion of the core, where said tie layer has been shrunk onto the wire core, where said tie layer comprises at least one of NYLON, polyethylene, polystyrene, polyurethane and polyethylene terephthalate, and where said tie layer further comprises one or more radio opaque material selected from barium sulfate, bismuth trioxide, bismuth carbonate, tungsten and tantalum.
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40. A guidewire suitable for guiding a catheter within a blood vessel, comprising an elongated flexible metal wire core of a super-elastic alloy having a tie layer disposed about at least a portion of the core, where said tie layer has been shrunk onto the wire core, and a layer disposed about said tie layer, said layer disposed about said tie layer comprising polymers produced from monomers selected from ethylene oxide;
- 2-vinyl pyridine;
N-vinylpyrrolidone;
polyethylene glycol acrylates such as mon-alkoxy polyethylene glycol mono(meth) acrylates, including mono-methoxy triethylene glycol mono(meth) acrylate, mono-methoxy tetraethylene glyco mono(meth) acrylate, polyethylene glycol mono(meth) acrylate;
other hydrophilic acrylates such as 2-hydroxyethylmethacrylate, glycerylmethacrylate;
acrylic acid and its salts;
acrylamide and acrylonitrile;
acrylamidomethylpropane sulfonic acid and its salts;
cellulose;
cellulose derivatives such as methyl cellulose, ethyl cellulose, carboxymethyl cellulose, cyanoethyl cellulose, cellulose acetate;
polysaccharides such as amylose, pectin, amylopectin, alginic acid, and cross-linked heparin.
- 2-vinyl pyridine;
Specification