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: from about 3.8% to about 4.0% by weight,
Nd: from about 0.04% to about 0.07% by weight,
Gd: 0 to about 2.8% by weight,
Dy: 0 to about 2.57% by weight,
Er: about 0.01% by weight,
Zr: from about 0.46% to about 0.47% by weight;
under the condition that:
a) a total content of Er, Gd and Dy is about 2.58% to about 2.81% by weight, and
b) a total content of Nd, Er, Gd and Dy is about 2.62% to about 2.88% by weight;
the balance being magnesium and incidental impurities, optionally including Al or Li, up to a total of 0.3% by weight;
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%.
2. The vascular implant of claim 1 , wherein the vascular implant is a stent.
3. The vascular implant of claim 1 , wherein,
Y is 3.93% by weight,
Nd is 0.07% by weight,
Gd is 2.8% by weight,
Dy is 0% by weight,
Er is 0.01% by weight, and
Zr is 0.46% by weight.
4. The vascular implant of claim 1 , wherein
Y is 3.85% by weight,
Nd is 0.04% by weight,
Gd is 0.0% by weight,
Dy is 2.57% by weight,
Er is 0.01% by weight, and
Zr is 0.47% by weight.
5. A method of manufacturing a vascular implant, comprising:
providing a biodegradable magnesium alloy according to claim 1 , and forming the vascular implant up to a total of 0.3% by weight of the alloy.
6. The method of claim 5 , wherein the vascular implant is a stent.
7. A vascular implant made in total or in parts of a biodegradable magnesium alloy consisting essentially of:
Y is about 4.0% by weight,
Nd is about 2.3% by weight,
Gd is about 5.9% by weight,
Dy is about 0.01% by weight,
Er is about 0.02% by weight,
Zr is about 0.53% by weight; and
the balance being magnesium and incidental impurities, optionally including Al or Li, up to a total of 0.3% by weight;
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%.
8. The vascular implant of claim 7 , wherein the vascular implant is a stent.