Super-elastic composite guidewire
First Claim
1. A guidewire section suitable for guiding a catheter within a body lumen, comprising an elongated, flexible metal wire core having at least a proximal and a distal section wherein the distal section comprises a super-elastic alloy having a UP of 75 ksi±
- 10 ksi, an LP of 25±
7.5 ksi measured at 3% strain and a PS of less than 0.25% where measured in a stress-strain test to 6% strain.
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Abstract
This is a composite 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 core or guidewire section may be of a stainless steel or a high elasticity metal alloy, preferably a Ni--Ti alloy, also preferably having specified physical parameters. The composite guidewire assembly is especially useful for accessing peripheral or soft tissue targets. Variations include multi-section guidewire assemblies having (at least) super-elastic distal portions and super-elastic braided reinforcements along the mid or distal sections. A variation of the inventive guidewire includes the coating of the wire with a tie layer and then with a one or more lubricious polymers to enhance its suitability for use within catheters and with the interior of vascular lumen.
307 Citations
29 Claims
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1. A guidewire section suitable for guiding a catheter within a body lumen, comprising an elongated, flexible metal wire core having at least a proximal and a distal section wherein the distal section comprises a super-elastic alloy having a UP of 75 ksi±
- 10 ksi, an LP of 25±
7.5 ksi measured at 3% strain and a PS of less than 0.25% where measured in a stress-strain test to 6% strain. - 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, 26)
- 10 ksi, an LP of 25±
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27. A guidewire section suitable for guiding a catheter within a body lumen, comprising:
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an elongated, flexible metal wire core having at least a proximal and a distal section, said distal section comprising a super-elastic alloy having a UP of 75 ksi±
10 ksi, measured at a 3% strain; andwherein said distal section is attached directly to said proximal section. - View Dependent Claims (28, 29)
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Specification