US4795458A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stent for use following balloon angioplasty
Assignee: Individual
•
Filing: 1987-07-02
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Granted: 1989-01-03
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Expires: 2007-07-02
Abstract
Abstract A stent for implanting in a blood vessel following balloon angioplasty to prevent restenosis. The stent is a helical coil of a shape memory alloy tape or wire. The coil has a diameter less than that of the blood vessel in which it is to be implanted. The tape or wire has previously been wound to form a helical coil having a diameter equal to or slightly greater than the inside diameter of said blood vessel, this coil is than heated to an elevated temperature for a time sufficient to fix the shape of the second mentioned coil in the memory of the tape or wire, cooled to ambient temperature and then rewound to form the first mentioned helical coil.
Inventors
- 👤 Barrie F. Regan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 21:58
CPC Classifications
A; A61; A61L; A61L31/00; A61L31/08; A61L31/082; A61L31/088; A61F; A61F2/00; A61F2/82; A61F2/86; A61F2/88; A61F2/95; A61F2/0004; A61L2400/00; A61L2400/16
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
107 words
A stent for implanting in a blood vessel following balloon angioplasty to prevent restonosis, said stent consisting of a helical coil of marmem alloy tape or wire having a diameter less than that of the blood vessel in which it is to be implanted, said tape or wire having earlier been wound to form a helical coil having a diameter equal to or greater than the inside diameter of said blood vessel and heated to an elevated temperature for a time to fix the shape of the second mentioned helical coil in the memory of the alloy and then covered with a thin surface coating of tin.
Claim 2
Dependent Claim
107 words
A stent for implanting in a blood vessel following balloon angioplasty to prevent restonosis, said stent consisting of a helical coil of marmem alloy tape or wire having a diameter less than that of the blood vessel in which it is to be implanted, said tape or wire having earlier been wound to form a helical coil having a diameter equal to or greater than the inside diameter of said blood vessel and heated to an elevated temperature for a time to fix the shape of the second mentioned helical coil in the memory of the alloy and then covered with a thin surface coating of tin.
Claim 3
Dependent Claim
14 words
The stent defined in claim 1 where in the marmem alloy is a nitinol.
Claim 4
Dependent Claim
21 words
The stent defined in claim 1 wherein the tin surface coating contains from about 1% to 10% by weight of indium.
Claim 5
Dependent Claim
124 words
A stent for insertion into a blood vessel following balloon angioplasty to prevent restenosis which comprises: a helical coil having a diameter slightly less than the diameter of the blood vessel in to which it is to be inserted, said coil being formed of a corrosion resistant shape memory alloy having a transition temperature in the range about 39°-60° C. which has been wound into a helical coil having a diameter equal to or slightly greater than that of the said blood vessel, heated to an elevated temperature for a time sufficient to fix the larger diameter coil shape in the memory of said alloy, then coated with a thin surface coating of tin and then rewound to form the first mentioned helical coil.
Claim 6
Dependent Claim
124 words
A stent for insertion into a blood vessel following balloon angioplasty to prevent restenosis which comprises: a helical coil having a diameter slightly less than the diameter of the blood vessel in to which it is to be inserted, said coil being formed of a corrosion resistant shape memory alloy having a transition temperature in the range about 39°-60° C. which has been wound into a helical coil having a diameter equal to or slightly greater than that of the said blood vessel, heated to an elevated temperature for a time sufficient to fix the larger diameter coil shape in the memory of said alloy, then coated with a thin surface coating of tin and then rewound to form the first mentioned helical coil.
Claim 7
Dependent Claim
14 words
The stent defined in claim 4 wherein the shape memory alloy is a nitinol.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-01-03 | 1992-07-04 | 1993-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-01-03 | 1996-07-04 | 1997-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-01-03 | 2000-07-04 | 2001-01-03 | $7700.00 | Window Closed / Lapsed |