US 12,070,533 B2
Metal alloy and medical device containing same
David Russell Bow, Glasgow (GB); Calum Bruce Macleod, Glasgow (GB); and Jeffrey Jump, Prangins (CH)
Assigned to Tam Christine Thompson-Steckel, Paisley (GB)
Appl. No. 16/642,730
Filed by Tam Christine Thompson-Steckel, Paisley (GB)
PCT Filed Aug. 30, 2018, PCT No. PCT/GB2018/052459
§ 371(c)(1), (2) Date Feb. 27, 2020,
PCT Pub. No. WO2019/043394, PCT Pub. Date Mar. 7, 2019.
Claims priority of application No. 1713907 (GB), filed on Aug. 30, 2017.
Prior Publication US 2020/0376172 A1, Dec. 3, 2020
Int. Cl. A61F 2/88 (2006.01); A61F 2/90 (2013.01); A61L 31/02 (2006.01); A61L 31/06 (2006.01); A61L 31/10 (2006.01); A61L 31/14 (2006.01); B33Y 80/00 (2015.01); C08G 63/08 (2006.01); C09D 5/00 (2006.01); C09D 167/04 (2006.01); C22C 23/00 (2006.01); A61F 2/82 (2013.01)
CPC A61L 31/022 (2013.01) [A61F 2/88 (2013.01); A61F 2/90 (2013.01); A61L 31/06 (2013.01); A61L 31/10 (2013.01); A61L 31/148 (2013.01); B33Y 80/00 (2014.12); C08G 63/08 (2013.01); C09D 5/00 (2013.01); C09D 167/04 (2013.01); C22C 23/00 (2013.01); A61F 2002/825 (2013.01); A61F 2210/0004 (2013.01); A61F 2230/0091 (2013.01); A61F 2240/001 (2013.01); A61F 2250/0067 (2013.01)] 31 Claims
OG exemplary drawing
 
1. A stent scaffold comprising a wire drawn from an alloy that consist:
3.2 to 4.8% by weight lithium,
0.5 to 2.0% by weight yttrium; and
the balance being high purity magnesium, wherein said alloy has an Fe and Ca content of 150 ppm or less, and has less than 500 ppm of all other rare earth metals;
wherein the wire is shaped into a repeating waveform having alternate crowns and troughs; and
(1) the height of the repeating waveform is from 0.8 mm to 1.2 mm; or
(2) the crowns of the repeating waveform in their formed position have an inner diameter, Dcrown according to the formula:
Dcrown=X×Dwire
wherein X is a ratio parameter having a value of from 2.4 to 2.8 and Dwire is the cross-sectional diameter of the wire.