Catheter guidewire with pseudo elastic shape memory alloy
First Claim
1. A length of solid core wire for use in a catheter guide wire, said core wire/catheter guide wire together having particular use with a catheter:
- said length of core wire comprising an end portion and a remainder portion extending therefrom,said end portion comprising a Ni-Ti alloy characterized by pseudoelasticity at a temperature of about 37°
C. and which exhibits plasticity at a temperature less than about 80°
C.,whereby said end portion can be readily deformed into a desired shape.
2 Assignments
0 Petitions
Accused Products
Abstract
A catheter guide wire is for use in guiding of a catheter to a destination position in vessels in body and comprises a solid core wire of a Ti-Ni shape memory alloy and an outer jacket covering the core wire. In order to provide a plasticity to one end portion of the core wire, at least one end portion is made of a 45.0-51.0 at % Ni-0.5-5.0 at % Fe-Ti shape memory alloy and is heat treated at 400°-500° C. The end portion is provided with a pseudo elasticity at a temperature about 37° and a plasticity at a temperature below 80° C. Alternatively, the end portion may be made of a 50.3-52.0 at % Ni-Ti alloy and is heat treated at a temperature of 700° C. In order to improve operability of the catheter guide wire, the remaining portion other than the end portion is made of provided with a comparatively high rigidity by a usual Ti-Ni shape memory alloy which is not heat treated. Alternatively, the remaining portion is covered with an inorganic layer. The inorganic layer is a coating and alternatively is a cladding. The solid core wire is covered with a synthetic resin layer to form the catheter guide wire.
487 Citations
14 Claims
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1. A length of solid core wire for use in a catheter guide wire, said core wire/catheter guide wire together having particular use with a catheter:
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said length of core wire comprising an end portion and a remainder portion extending therefrom, said end portion comprising a Ni-Ti alloy characterized by pseudoelasticity at a temperature of about 37°
C. and which exhibits plasticity at a temperature less than about 80°
C.,whereby said end portion can be readily deformed into a desired shape. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A length of solid core wire for use in a catheter guide wire, said core wire/catheter guide wire together having particular use with a catheter,
said length of core wire comprising and end portion and a remainder portion extending therefrom, wherein said core wire is made of a shape memory alloy, wherein said end portion exhibits pseudoelasticity at a temperature of about 37° - C., and
wherein said remainder portion exhibits elasticity but no pseudoelasticity. - View Dependent Claims (9, 10, 11, 12, 13, 14)
- C., and
Specification