Implant made of a biodegradable magnesium alloy
An implant made in total or in parts of a biodegradable magnesium alloy consisting of Y: 2.0-6.0% by weight, Nd: 1.5-4.5% by weight, Gd: 0-4.0% by weight, Dy: 0-4.0% by weight, Er: 0-4.0% by weight, Zr: 0.1-1.0% by weight, Li: 0-0.2% by weight, Al: 0-0.3% by weight, under the condition that a) a total content of Er, Gd and Dy is in the range of 0.5-4.0% by weight and b) a total content of Nd, Er, Gd and Dy is in the range of 2.0-5.5% by weight, the balance being magnesium and incidental impurities up to a total of 0.3% by weight.
1. A vascular implant made in total or in parts of a biodegradable magnesium alloy consisting essentially of:
Y: 2.0-6.0% by weight,
Nd: 1.5-4.5% by weight,
Gd: 0-4.0% by weight,
Dy: 0-4.0% by weight,
Er: 0-4.0% by weight,
Zr: 0.1-1.0% by weight,
Li: 0-0.2% by weight,
Al: 0-0.3% by weight;
under the condition that:
a) a total content of Er, Gd and Dy is in the range of 0.5-4.0% by weight, and
b) a total content of Nd, Er, Gd and Dy is in the range of 2.0-5.5% by weight;
the balance being magnesium and incidental impurities up to a total of 0.3% by weight.
2. The vascular implant of claim 1 , wherein the content of Y is 3.5-4.5% by weight.
3. The vascular implant of claim 2 , wherein the content of Y is 3.9-4.1% by weight.
4. The vascular implant of claim 1 , wherein the content of Nd is 1.5-3.0% by weight.
5. The vascular implant of claim 1 , wherein the content of Nd is 2.0-3.0% by weight.
6. The vascular implant of claim 1 , wherein the content of Zr is 0.1-0.7% by weight.
7. The vascular implant of claim 1 , wherein the total content of Er, Gd and Dy is in the range of 0.5-1.5% by weight.
8. The vascular implant of claim 1 , wherein the total content of Nd, Er, Gd and Dy is in the range of 2.0-3.5% by weight.
9. The vascular implant of claim 1 , wherein the area percentage of particles in the alloy having an average particle size in the range of 1 to 15 μm is less than 3%.
10. The vascular implant of claim 1 , wherein the implant is a stent.
11. A method of manufacturing a vascular implant, comprising:
providing a biodegradable magnesium alloy consisting essentially of:
Y: 2.0-6.0% by weight,
Nd: 1.5-4.5% by weight,
Gd: 0-4.0% by weight,
Dy: 0-4.0% by weight,
Er: 0-4.0% by weight,
Zr: 0.1-1.0% by weight,
Li: 0-0.2% by weight,
Al: 0-0.3% by weight;
under the condition that:
a) a total content of Er, Gd and Dy is in the range of 0.5-4.0% by weight, and
b) a total content of Nd, Er, Gd and Dy is in the range of 2.0-5.5% by weight;
the balance being magnesium and incidental impurities up to a total of 0.3% by weight; and
forming a vascular implant from the alloy.
12. The method of claim 11 , wherein the vascular implant is a stent.