Stent devices made of a lattice with smooth shape cells improving stent fatigue life
US9492296B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 24, 2012 |
| Grant date | Nov 15, 2016 |
| Priority date | — |
| Expiry date | Jun 5, 2033 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61F2230/0054
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A method for generating a lattice cell shape for a stent comprising generating a unit cell model representing a stent cell to be made of a given material, the unit cell model comprising elements each comprising points defining a G2-continuous curve, setting a weighting factor to a same value for each one of the points, the weighting factor representing a contribution of a corresponding one of the points to a curvature of an optimal curve, determining a curvature of the G2-continuous curve as a function of the weighting factors having the same value, and structurally optimizing the unit cell model by iteratively determining a variable value for the weighting factor value using stress-strain characteristics for the given material, determining a new curvature of the G2-continuous curve as a function of the variable value, and minimizing the new curvature, thereby obtaining an optimized curve corresponding to an optimized lattice cell shape.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.