Title:
BIOABSORBABLE STENT
Document Type and Number:
WIPO Patent Application WO/2020/158761
Kind Code:
A1
Abstract:
Provided are a magnesium alloy stent having improved corrosion resistance and a method for producing the same. (1) This bioabsorbable stent is provided with a first corrosion-resistant layer which is formed on a core structure formed from a magnesium alloy and is mainly composed of magnesium fluoride and a second corrosion-resistant layer which is a diamond-like carbon coating formed on the first corrosion-resistant layer. (2) This method for producing the biodegradable stent involves: forming the first corrosion-resistant layer mainly composed of magnesium fluoride by subjecting the surface of the core structure to a fluorination treatment; and then forming the second corrosion-resistant layer by placing the core structure with the first corrosion-resistant layer formed thereon in a high-frequency plasma CVD apparatus and coating the surface of the core structure with a diamond-like carbon film by introducing a carbon-containing raw material gas.
Inventors:
YAMASHITA SHUZO (JP)
SASAKI MAKOTO (JP)
WADA AKIRA (JP)
SASAKI MAKOTO (JP)
WADA AKIRA (JP)
Application Number:
PCT/JP2020/003050
Publication Date:
August 06, 2020
Filing Date:
January 28, 2020
Export Citation:
Assignee:
JAPAN MEDICAL DEVICE TECH CO LTD (JP)
International Classes:
A61F2/82; A61F2/915; A61L27/04; A61L27/28; A61L27/30; A61L27/34; A61L27/54; A61L27/58; A61L31/02; A61L31/12; A61L31/14; A61L31/16
Domestic Patent References:
| WO2018139647A1 | 2018-08-02 | |||
| WO2020012529A1 | 2020-01-16 | |||
| WO2019182003A1 | 2019-09-26 |
Foreign References:
| JP2007195883A | 2007-08-09 | |||
| US20160129162A1 | 2016-05-12 |
Other References:
ZHANG Y ET AL.: "Characterization and degradation comparison of DLC film on different magnesium alloys.", SURFACES & COATINGS TECHNOLOGY, vol. 205, no. 1, 2010, pages S15 - S20, XP027556841
YAN LIN WEI; LIN LIN HUANG; LI JUN HAN; YA SHAO CHEN: "Corrosion resistance and surface biocompatibility of diamond-like carbon coating on AZ31D magnesium alloy", INTERNATIONAL JOURNAL OF SURFACE SCIENCE AND ENGINEERING, vol. 10, no. 2, 30 November 2015 (2015-11-30), CH, pages 101 - 115, XP009529458, ISSN: 1749-785X, DOI: 10.1504/IJSURFSE.2016.076508
See also references of EP 3919029A4
YAN LIN WEI; LIN LIN HUANG; LI JUN HAN; YA SHAO CHEN: "Corrosion resistance and surface biocompatibility of diamond-like carbon coating on AZ31D magnesium alloy", INTERNATIONAL JOURNAL OF SURFACE SCIENCE AND ENGINEERING, vol. 10, no. 2, 30 November 2015 (2015-11-30), CH, pages 101 - 115, XP009529458, ISSN: 1749-785X, DOI: 10.1504/IJSURFSE.2016.076508
See also references of EP 3919029A4
Attorney, Agent or Firm:
SUGIMOTO, Shuji et al. (JP)
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