	US 11,969,368 B2
	Lumen stent and preform thereof, and methods for preparing the lumen stent and preform thereof
Deyuan Zhang, Shenzhen (CN); Xianmiao Chen, Shenzhen (CN); Wenjiao Lin, Shenzhen (CN); and Xiangdong Liu, Shenzhen (CN)
Assigned to BIOTYX MEDICAL (SHENZHEN) CO., LTD., Shenzhen (CN)
Filed by BIOTYX MEDICAL (SHENZHEN) CO., LTD., Guangdong (CN)
Filed on Jul. 7, 2022, as Appl. No. 17/859,563.
Application 17/859,563 is a division of application No. 15/526,509, filed on May 12, 2017, granted, now 11,389,308, issued on Jul. 19, 2022.
Prior Publication US 2022/0339012 A1, Oct. 27, 2022
Int. Cl. A61F 2/82 (2013.01); A61L 27/04 (2006.01); A61L 31/02 (2006.01); C21D 8/10 (2006.01); C21D 9/08 (2006.01); C22C 38/00 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C22C 38/14 (2006.01); C22C 38/42 (2006.01); C22C 38/44 (2006.01); C23C 8/02 (2006.01); C23C 8/26 (2006.01); B21C 1/00 (2006.01); B21C 1/24 (2006.01)

CPC A61F 2/82 (2013.01) [A61L 27/04 (2013.01); A61L 31/02 (2013.01); A61L 31/022 (2013.01); C21D 8/105 (2013.01); C21D 9/08 (2013.01); C22C 38/002 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/14 (2013.01); C22C 38/42 (2013.01); C22C 38/44 (2013.01); C23C 8/02 (2013.01); C23C 8/26 (2013.01); A61F 2240/001 (2013.01); B21C 1/00 (2013.01); B21C 1/003 (2013.01); B21C 1/24 (2013.01)]

20 Claims

1. A lumen stent preform, characterized in that the lumen stent preform is pure iron or an iron alloy, a total impurity element content of the pure iron is less than or equal to 0.5 wt. %, a total alloy element content of the iron alloy is less than or equal to 3 wt. %, and the iron alloy contains no strong nitride-forming element, the lumen stent preform has a hardness of 160-250HV0.05/10, and has a microstructure that is a deformed structure having a deformed structure after cold machining, wherein a carbon content in the total alloy elements of the iron alloy is less than or equal to 0.45 wt. %.