US6416544B2
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stent manufacturing method thereof and indwelling method thereof
Assignee: OGAWA SPRING CO Ltd
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Filing: 1999-11-10
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Granted: 2002-07-09
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Expires: 2019-11-10
Abstract
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.
Inventors
- 👤 Yoichi Sugita
- 👤 Akira Ogawa
- 👤 Kenji Kyo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 09:26
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/82; A61F2/86; A61F2/90; A61F2210/00; A61F2210/0014; A61F2210/0023; A61F2210/0042
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
109 words
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.
Claim 2
Dependent Claim
109 words
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.
Claim 3
Dependent Claim
21 words
The stent according to claim 1 , wherein the first shape has a diameter smaller than that of the second shape.
Claim 4
Dependent Claim
22 words
The stent according to claim 2 , wherein the braided filament bodies are fixed only at both ends of the hollow body.
Claim 5
Dependent Claim
26 words
The stent according to claim 2 , wherein the diameter of the second shape is larger at both opening ends than in an intermediate portion thereof.
Claim 6
Dependent Claim
25 words
The stent according to claim 1 , wherein one or more than one of the plurality of filament bodies is/are made of gold or tantalum.
Claim 7
Dependent Claim
16 words
The stent according to claim 1 , wherein the Ti—Ni alloy further contains Co or Cu.
Claim 8
Dependent Claim
15 words
The stent of claim 1 , wherein said hollow body is a hollow cylindrical body.
Claim 9
Independent Claim
129 words
A method of manufacturing a stent, comprising the steps of: 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.
Claim 10
Independent Claim
129 words
A method of manufacturing a stent, comprising the steps of: 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.
Claim 11
Dependent Claim
40 words
The method according to claim 8 , wherein the solution thermal treatment is conducted while keeping the hollow body in the fist shape, and the constraint aging thermal treatment is conducted while binding the hollow body in the second shape.
Claim 12
Dependent Claim
15 words
The method of claim 8 , wherein said hollow body is a hollow cylindrical body.
References Cited (Backward Citations)
US4586969A
Cited
EP0411118A1
Cited
JPH0351430A
Cited
US5292331A
Cited
US5645559A
Cited
US5716410A
Cited
US5624508A
Cited
US6083257A
Cited
US5976152A
Cited
US5980566A
Cited
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 2005-07-08 | 2006-01-07 | 2006-07-09 | $2000.00 | Window Closed / Lapsed |
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