Method of forming a bend of a predetermined bend angle in a shape memory alloy wire and method of making a self-expanding stent
US11224910B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 1, 2018 |
| Grant date | Jan 18, 2022 |
| Priority date | — |
| Expiry date | Mar 14, 2039 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61F2240/001
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A method of making a self-expanding stent entails applying a bend stress sufficient to over-bend a portion of a wire by an amount in a range from about 85% to about 105%, where the wire comprises a Ni—Ti alloy and includes from about 40% to about 46% cold work. The bend stress is then released, thereby forming a bend having a predetermined bend angle in the wire. The application and release of the bend stress are repeated on successive portions of the wire in order to create a series of bends along a length of the wire in a predetermined bend pattern. The wire comprising the predetermined bend pattern is then positioned about a mandrel in an expanded stent geometry and heat set. Thus, a self-expanding stent is formed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.