US 11,684,692 B2
Absorbable iron-based instrument
Hongtao Sun, Shenzhen (CN); Deyuan Zhang, Shenzhen (CN); Jun Hu, Shenzhen (CN); and Liping Chen, Shenzhen (CN)
Assigned to Lifetech Scientific (Shenzhen) Co. Ltd., Shenzhen (CN)
Appl. No. 16/473,896
Filed by Biotyx Medical (Shenzhen) Co., Ltd., Shenzhen (CN)
PCT Filed Dec. 19, 2017, PCT No. PCT/CN2017/117214
§ 371(c)(1), (2) Date Jun. 26, 2019,
PCT Pub. No. WO2018/121350, PCT Pub. Date Jul. 5, 2018.
Claims priority of application No. 201611262095.X (CN), filed on Dec. 30, 2016.
Prior Publication US 2020/0384149 A1, Dec. 10, 2020
This patent is subject to a terminal disclaimer.
Int. Cl. A61L 27/04 (2006.01); A61L 27/34 (2006.01); A61L 27/54 (2006.01); A61L 27/58 (2006.01); A61L 17/10 (2006.01); A61L 17/00 (2006.01); A61L 31/02 (2006.01); A61L 31/06 (2006.01); A61L 31/14 (2006.01); A61L 31/16 (2006.01); C08L 67/04 (2006.01); A61K 45/06 (2006.01)
CPC A61L 27/04 (2013.01) [A61L 17/005 (2013.01); A61L 17/105 (2013.01); A61L 27/34 (2013.01); A61L 27/54 (2013.01); A61L 27/58 (2013.01); A61L 31/022 (2013.01); A61L 31/06 (2013.01); A61L 31/148 (2013.01); A61L 31/16 (2013.01); C08L 67/04 (2013.01); A61K 45/06 (2013.01); A61L 2300/41 (2013.01); A61L 2300/416 (2013.01); A61L 2300/42 (2013.01)] 10 Claims
 
1. An absorbable iron-based device, comprising an iron-based substrate, a zinc-containing protector that completely covers the iron-based substrate, and a degradable polyester in contact with the iron-based substrate and/or the zinc-containing protector, wherein the ratio of the mass of the zinc-containing protector to the mass of the iron-based substrate ranges between 1:200 and 1:2; and wherein the degradable polyester is poly-D,L-lactic acid having a molecular weight less than 10,000, a mass fraction of 2 percent and a residual monomer having a mass fraction of 1.6 percent.