Surface treated bioerodible metal endoprostheses

US8668732B2 · kind B2 · utility

Assignee

• Boston Scientific Scimed, Inc. · US

Inventors

• Torsten Scheuermann · Munich, DE
• Jan Weber · Maple Grove, US
• Charles Deng · Chanhassen, US
• Jonathan S. Stinson · Plymouth, US
• Steven R. Larsen · Lino Lakes, US
• Dennis A. Boismier · Shorewood, US
• Jacob Drew Edick · Minneapolis, US

Key dates

• Filing date: Mar 22, 2011
• Grant date: Mar 11, 2014
• Expiry date: Jun 7, 2031

Classification

• Technology area (CPC A): Human Necessities
• CPC primary: A61F2210/0004
• WIPO field: Medical technology
• WIPO sector: Instruments

Abstract

An endoprosthesis includes an expandable tubular body defined by a plurality of struts. In some embodiments, the expandable tubular body includes a bioerodible metal that has at least a first surface region and a second surface region. The first and second surface regions can have different surface oxide compositions. In some embodiments, the first portion has a thermally altered microstructure and the second portion has a wrought microstructure. The thermally altered microstructure can be a cast microstructure comprising dendritic grains. The first portion forms at least a portion of an outer surface of the expandable tubular body. In some embodiments, the expandable tubular body includes iron or a bioerodible iron alloy and at least one surface of the expandable tubular body includes a substantially uniform coating of iron(III) oxide.