Biocorrodible magnesium alloy implant

Patent metadata

Field	Value
Publication number	US-10052188-B2
Application number	US-201213977323-A
Country	US
Kind code	B2
Filing date	Feb 1, 2012
Priority date	Feb 24, 2011
Publication date	Aug 21, 2018
Grant date	Aug 21, 2018

Abstract

One embodiment of the invention relates to an implant comprising a base body made of a biocorrodible magnesium alloy. The magnesium alloy contains a plurality of statistically distributed particles, comprising one or more of the elements Y, Zr, Mn, Sc, Fe, Ni, Co, W, Pt and noble earths with the atomic numbers 57 to 71, or the particles comprise alloys or compounds containing one or more of the elements mentioned. The mean distance of the particles from each other is smaller than the hundredfold mean particle diameter.

First claim

What is claimed is:

1. An implant having a base body comprising a biocorrodible magnesium alloy, wherein the magnesium alloy contains a plurality of statistically distributed microparticles or nanoparticles, wherein the mean distance of the microparticles or nanoparticles from each other is smaller than the hundredfold mean particle diameter, and the microparticles or nanoparticles comprise one or more of the elements Y, Zr, Mn, Sc, Fe, Ni, Co, W, Pt, and noble earths with the atomic numbers from 57 to 71, or alloys, or compounds containing one or more of these elements.

2. The implant according to claim 1 , wherein the microparticles or nanoparticles consist of one or more of the elements Y, Zr, Mn, Sc, Fe, Ni, Co, W, Pt, and noble earths with the atomic numbers 57 to 71, or alloys, or compounds consisting of one or more of these elements.

3. The implant according to claim 1 , wherein the microparticles or nanoparticles have a mean diameter of 1 nm to 10 μm.

4. The implant according to claim 1 , wherein the microparticles or nanoparticles are incorporated into a surface or into a near-surface region of the base body.

5. The implant according to claim 1 , wherein a number of the microparticles or nanoparticles on the surface of the base body ranges between 1×103 and 1×106 per mm2.

6. The implant according to claim 5 , wherein a ratio of the mean particle diameter to the mean distance of the microparticles or nanoparticles from each other ranges between 1:2 and 1:10.

7. The implant according to claim 1 , wherein a number of the microparticles or nanoparticles in the volume of the base body ranges between 1×103 and 1×109 per mm3.

8. The implant according to claim 1 , wherein a mean distance between the microparticles or nanoparticles ranges being between 200 nm and 100 μm.

9. An implant according to claim 1 , wherein the implant is a stent.

10. An implant according to claim 1 wherein the microparticles or nanoparticles are Fe.

11. An implant according to claim 1 wherein the mean distance d_mean between particles is optimized according to the relationship:

d
mean

=

2
·

A
protect

N
·
π

where protected total area A_protect is obtained by assuming non-overlapping protected regions from the sum over the distribution of the areas A_cathodic_center protected by the individual particles:

A
protect

=

∑

i
=

1
⁢

⁢
…
⁢

⁢
N

⁢

A
i

cathodic
⁢

⁢
center

where N is the number of particles.

12. An implant having a base body comprising a biocorrodible magnesium alloy, wherein the magnesium alloy contains a plurality of statistically distributed particles, wherein the mean distance of the particles from each other is smaller than the hundredfold mean particle diameter, and the particles comprise one or more of the elements Y, Zr, Mn, Sc, Fe, Ni, Co, W, Pt, and noble earths with the atomic numbers from 57 to 71, or alloys, or compounds containing one or more of these elements, wherein the base body comprises segment rings and longitudinal connecting struts, and the particles are contained in the segment rings but not in the connecting struts.

13. The implant according to claim 12 , wherein the particles have a mean diameter of 1 nm to 10 μm.

14. The implant according to claim 12 , wherein the particles are incorporated into a surface or into a near-surface region of the base body.

15. The implant according to claim 12 , wherein a number of the particles on the surface of the base body ranges between 1×10 3 and 1×10 6 per mm 2 .

16. The implant according to claim 12 , wherein a number of the particles in the volume of the base body ranges between 1×10 3 and 1×10 9 per mm 3 .

17. The implant according to claim 12 , wherein a ratio of the mean particle diameter to the mean distance of the particles from each other ranges between 1:2 and 1:10.

18. The implant according to claim 12 , wherein a mean distance between the particles ranges being between 200 nm and 100 μm.

19. An implant according to claim 12 , wherein the implant is a stent.

20. An implant having a base body comprising a biocorrodible magnesium alloy, wherein the magnesium alloy contains a plurality of statistically distributed microparticles or nanoparticles, wherein the mean distance of the microparticles or nanoparticles from each other is smaller than the hundredfold mean particle diameter, and the particles comprise one or more of the elements consisting of the group of Y, Zr, Mn, Sc, Fe, Ni, Co, Pt, and noble earths with the atomic numbers from 57 to 71, or alloys, or compounds containing one or more of these elements.

Assignees

• Kalb Hermann
• Rzany Alexander
• Gerold Bodo
• Biotronik Ag

Inventors

• Kalb Hermann
• Rzany Alexander
• Gerold Bodo

Classifications

• A61L31/022

  Metals or alloys · CPC title

• A61L27/306

  Other specific inorganic materials not covered by A61L27/303 - A61L27/32 · CPC title

• A61F2/06 Primary

  Blood vessels · CPC title

• A61L31/148

  Materials at least partially resorbable by the body · CPC title

• A61L27/58

  Materials at least partially resorbable by the body · CPC title