Stent manufacturing method thereof and indwelling method thereof
First Claim
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1. A stent comprising a hollow body made of a plurality of braided filament bodies of an iron-free Ti—
- Ni alloy having excessive Ni, the hollow body memorize a first shape during a lower-temperature shape memorizing process and a second shape during a higher-temperature shape memorizing process and being reversibly deformable between the fist shape and the second shape in accordance with temperature change;
wherein the lower-temperature shape memorizing process is a solution thermal treatment and the higher-temperature shape memorizing process is a constraint aging thermal treatment; and
the solution thermal treatment is conducted at a temperature higher than about 800°
C. and lower than or equal to about 1000°
C.
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Abstract
A stent is reversibly deformable between a lower-temperature shape and a higher-temperature shape in accordance with temperature changes in a patient'"'"'s body. The stent has a hollow cylindrical body formed by a plurality of braided filament bodies made of a Ti—Ni alloy of excessive Ni. A lower-temperature shape memorizing process and a higher-temperature shape memorizing process are conducted to the hollow cylindrical body to memorize the lower-temperature and higher-temperature shapes, respectively. The crossing filament bodies are fixed only at the ends of the stent.
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Citations
10 Claims
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1. A stent comprising a hollow body made of a plurality of braided filament bodies of an iron-free Ti—
- Ni alloy having excessive Ni, the hollow body memorize a first shape during a lower-temperature shape memorizing process and a second shape during a higher-temperature shape memorizing process and being reversibly deformable between the fist shape and the second shape in accordance with temperature change;
wherein the lower-temperature shape memorizing process is a solution thermal treatment and the higher-temperature shape memorizing process is a constraint aging thermal treatment; and
the solution thermal treatment is conducted at a temperature higher than about 800°
C. and lower than or equal to about 1000°
C.- View Dependent Claims (2, 3, 4, 5, 6, 7)
- Ni alloy having excessive Ni, the hollow body memorize a first shape during a lower-temperature shape memorizing process and a second shape during a higher-temperature shape memorizing process and being reversibly deformable between the fist shape and the second shape in accordance with temperature change;
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8. A method of manufacturing a stent, comprising the steps of:
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braiding a plurality of filament bodies of an iron-free Ti—
Ni alloy of excessive Ni to form a hollow body deformable into mutually different first and second shapes;
conducting a lower-temperature shape memorizing process for causing the hollow body to memorize the first shape as a lower-temperature shape; and
conducting a higher-temperature shape memorizing process for causing the hollow body to memorize the second shape as a higher-temperature shape;
wherein a solution thermal treatment is conducted during the lower-temperature shape memorizing process and a constraint aging thermal treatment is conducted during the higher-temperature shape memorizing process; and
the solution thermal treatment is conducted at a temperature higher than about 800°
C. and lower than or equal to about 1000°
C.- View Dependent Claims (9, 10)
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Specification