Titanium nano-scale etching on an implant surface

Patent metadata

Field	Value
Publication number	US-9757212-B2
Application number	US-201615066213-A
Country	US
Kind code	B2
Filing date	Mar 10, 2016
Priority date	Mar 29, 2010
Publication date	Sep 12, 2017
Grant date	Sep 12, 2017

Abstract

A method of forming an implant to be implanted into living bone is disclosed. The method comprises the act of roughening at least a portion of the implant surface to produce a microscale roughened surface. The method further comprises the act of immersing the microscale roughened surface into a solution containing hydrogen peroxide and a basic solution to produce a nanoscale roughened surface consisting of nanopitting superimposed on the microscale roughened surface. The nanoscale roughened surface has a property that promotes osseointegration.

First claim

What is claimed is:

1. An implant to be implanted into living bone, comprising:
a head portion having a non-rotational features;
a lowermost end opposing the head portion; and
a threaded bottom portion for engaging bone between the head portion and the lowermost end, wherein a portion of a surface of the implant has a microscale roughened surface and a nanoscale roughened surface superimposed on the microscale roughened surface, the nanoscale roughened surface including nanopitting superimposed on the microscale roughened surface.

2. The implant of claim 1 , wherein the implant is made of metal selected form the group consisting of tantalum, cobalt, chromium, titanium, stainless steel, or alloys thereof.

3. The implant of claim 1 , wherein the implant is a dental implant.

4. The implant of claim 1 , wherein the portion of the surface of the implant is the threaded bottom portion for facilitating bonding with bone.

5. The implant of claim 1 , wherein the microscale roughened surface includes a grit blasted surface.

6. The implant of claim 5 , wherein the microscale roughened surface includes peak-to-valley irregularity distances of about 10 microns to about 30 microns and peak-to-peak distances of less than about 3 microns.

7. The implant of claim 1 , wherein the microscale roughened surface includes an acid etched surface.

8. The implant of claim 7 , wherein the acid etched surface is a sulfuric acid and a hydrochloric acid-etched surface.

9. The implant of claim 1 , wherein the nanopitting is formed by immersing the implant in a solution including hydrogen peroxide and a basic solution.

10. The implant of claim 9 , wherein the basic solution includes sodium hydroxide.

11. The implant of claim 9 , wherein the basic solution includes potassium hydroxide solution.

12. The implant of claim 1 , wherein the nanopitting is in the range of about 1 nanometer to about 100 nanometers.

13. The implant of claim 1 , further including discrete nanoparticles superimposed on the nanoscale roughened surface.

14. The implant of claim 13 , further including a sodium lactate coating on the discrete nanoparticles.

15. An implant to be implanted into living bone, comprising:
a head portion having a non-rotational features;
a lowermost end opposing the head portion; and
a threaded bottom portion for engaging bone between the head portion and the lowermost end, wherein the threaded bottom portion includes a microscale roughened surface having peak-to-valley heights of about 10 microns to about 30 microns and a nanoscale roughened surface superimposed on the microscale roughened surface, the nanoscale roughened surface having peak-to-valley heights of less than about 10 microns superimposed on the microscale roughened surface, the nanoscale roughened surface includes nanopitting.

16. The implant of claim 15 , wherein the nanoscale roughened surface has peak-to-valley heights of about 1 micron to about 3 microns.

17. The implant of claim 15 , further including discrete nanoparticles on the nanoscale roughened surface.

18. The implant of claim 17 , further including a sodium lactate coating on the discrete nanoparticles.

19. The implant of claim 15 , wherein the implant is a dental implant.

20. The implant of claim 15 , wherein the nanopitting is formed by immersing the implant in a solution including hydrogen peroxide and a basic solution, the basic solution is a potassium hydroxide solution having a concentration of about 3-5% w/w and the hydrogen peroxide has a concentration of about 13-22% w/w.

Assignees

• Biomet 3I Llc

Inventors

• Mayfield Robert L
• Towse Ross W

Classifications

• C23F1/26

  for etching refractory metals · CPC title

• A61C8/0037

  Details of the shape · CPC title

• A61C8/00

  Means to be fixed to the jaw-bone for consolidating natural teeth or for fixing dental prostheses thereon; Dental implants; Implanting tools (fastening of peg-teeth in the mouth A61C13/30) · CPC title

• A61C2008/0046

  Textured surface, e.g. roughness, microstructure (A61C8/0013 takes precedence) · CPC title

• C23G1/106

  refractory metals · CPC title