US 12,109,333 B2
Bioabsorbable stent
Makoto Sasaki, Kumamoto (JP); Yuki Koga, Kumamoto (JP); Yuki Okazawa, Kumamoto (JP); Hironori Ueda, Kumamoto (JP); Masashi Inoue, Kumamoto (JP); and Shuzo Yamashita, Kumamoto (JP)
Assigned to Japan Medical Device Technology Co., LTD., Kumamoto (JP); and FUJI LIGHT METAL CO., LTD., Kumamoto (JP)
Filed by Japan Medical Device Technology Co., LTD., Kumamoto (JP); and FUJI LIGHT METAL CO., LTD., Kumamoto (JP)
Filed on Sep. 17, 2020, as Appl. No. 17/024,262.
Application 17/024,262 is a continuation of application No. PCT/JP2019/011667, filed on Mar. 20, 2019.
Claims priority of application No. 2018-054300 (JP), filed on Mar. 22, 2018; and application No. 2018-144220 (JP), filed on Jul. 31, 2018.
Prior Publication US 2021/0001013 A1, Jan. 7, 2021
Int. Cl. A61L 31/02 (2006.01); A61F 2/82 (2013.01); A61L 31/08 (2006.01); A61L 31/10 (2006.01); A61L 31/14 (2006.01); A61L 31/16 (2006.01); C08L 65/04 (2006.01)
CPC A61L 31/022 (2013.01) [A61F 2/82 (2013.01); A61L 31/088 (2013.01); A61L 31/10 (2013.01); A61L 31/148 (2013.01); A61L 31/16 (2013.01); C08L 65/04 (2013.01); A61F 2210/0004 (2013.01); A61F 2210/0076 (2013.01); A61F 2250/0068 (2013.01); A61L 2300/416 (2013.01); A61L 2420/02 (2013.01); A61L 2420/08 (2013.01); C08L 2201/06 (2013.01); C08L 2203/02 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A bioabsorbable stent comprising:
a core structure comprising a magnesium alloy containing 90 wt % or more of magnesium as a main component, and zinc, zirconium, and manganese as accessary components, the magnesium alloy being free of any rare earth elements and aluminum;
a first corrosion resistant layer formed on the core structure of the magnesium alloy and containing magnesium fluoride as a main component; and
a second corrosion resistant layer formed on the first corrosion resistant layer and comprising a parylene,
wherein in the magnesium alloy, unavoidable impurities selected from the group consisting of Fe, Ni, Co, and Cu are contained in a total content of 30 ppm or less, and
the magnesium alloy comprises 0.95 to 2.00 wt % of zinc, 0.05 to 0.80 wt % of zirconium, 0.05 to 0.40 wt % of manganese, and the balance consisting of magnesium and unavoidable impurities.