High-modulus superelastic alloy wire for medical and dental purposes

• US 8,801,633 B2
• Filed: 08/31/2009
• Issued: 08/12/2014
• Est. Priority Date: 08/31/2009
• Status: Active Grant

• Current Assignee: Heraeus Medical Components LLC (Heraeus Holding GMBH)
• Original Assignee: NeoMetrics, Inc. (Natus Medical Incorporated)
• Inventors: Fox, Karl, Albers, Jason, Liebl, David
• Primary Examiner(s): HINDENBURG, MAX F
• Application Number:
  US12/550,954
• Publication Number:
  US 20110054351A1
• Time in Patent Office: 1,807 Days
• Field of Search: 600/585
• US Class Current: 600/585
• CPC Class Codes: A61C 7/20 Arch wires A61C7/28 takes precedence
• CPC Class Codes: A61L 2400/16 Materials with shape-memory or superelastic properties
• CPC Class Codes: A61L 27/06 Titanium or titanium alloys
• CPC Class Codes: A61L 27/50 Materials characterised by their function or physical properties , e.g. injectable or lubricating compositions, shape-memory materials, surface modified materials
• CPC Class Codes: A61L 31/022 Metals or alloys
• CPC Class Codes: A61L 31/14 Materials characterised by their function or physical properties , e.g. injectable or lubricating compositions, shape-memory materials, surface modified materials
• CPC Class Codes: A61L 31/143 Stabilizers
• CPC Class Codes: A61M 2025/09133 having specific material compositions or coatings; Materials with specific mechanical behaviours, e.g. stiffness, strength to transmit torque
• CPC Class Codes: A61M 2025/09141 made of shape memory alloys which take a particular shape at a certain temperature
• CPC Class Codes: A61M 25/09 Guide wires
• CPC Class Codes: C08L 2201/12 Shape memory
• CPC Class Codes: C21D 2201/01 Shape memory effect
• CPC Class Codes: C21D 2201/02 Superplasticity
• CPC Class Codes: C22C 19/03 based on nickel
• CPC Class Codes: C22F 1/10 of nickel or cobalt or alloys based thereon
• CPC Class Codes: Y10T 428/294 including metal or compound thereof [excluding glass, ceramic and asbestos]

Abstract

A wire used in the medical field for guiding purposes, as well as in other fields, such as in the field of orthodontics for teeth aligning purposes. The wire, when prepared for use in such applications, exhibits an innovative blend of advantageous properties, including enhanced kink resistance over stainless steel wires and enhanced stiffness over Nitinol wires, which enhance its use as a medical guidewire or stylet, and further, as an arch wire in orthodontia applications.

Claims

1. A wire used for one of medical or orthodontia purposes, comprising an elongated, flexible metal wire core at least partially formed of a superelastic trinary alloy, the superelastic trinary alloy having both an upper plateau (UP) and a lower plateau (LP) from a 3-point bend test that are respectively greater than a UP and a LP from same 3-point bend test of binary Nitinol alloy with substantially similar diameter as the wire core, the superelastic trinary alloy formed via high temperature and torsion treatment straightening solely.

2. The wire of claim 1, wherein the UP of the superelastic trinary alloy is at least 45% greater than the UP of the binary Nitinol alloy.

3. The wire of claim 2, wherein the UP of the superelastic trinary alloy is in the range of between 45% and 80% greater than the UP of the binary Nitinol alloy.

4. The wire of claim 1, wherein the UP of the superelastic trinary alloy is at least 45% of peak value of 304 stainless steel alloy of substantially similar diameter of the wire core.

5. The wire of claim 4, wherein the UP of the superelastic trinary alloy is in the range between 45% and 75% of peak value of the stainless steel alloy.

6. The wire of claim 1, wherein the wire core is configured for use as part of a medical guidewire or stylet.

7. The wire of claim 1, wherein the wire core is configured for use as an orthodontia arch wire.

8. The wire of claim 1, wherein the superelastic trinary alloy consists of Nickel, Titanium, and Cobalt.

9. The wire of claim 8, wherein the superelastic trinary alloy has a weight percentage of the Cobalt of less than or equal to 2% and weight percentages of the Nickel and of the Titanium of greater than 40%.

10. The wire of claim 9, wherein the UP of the superelastic trinary alloy is at least 60% greater than the UP of the binary Nitinol alloy.

11. The wire of claim 9, wherein the UP of the superelastic trinary alloy is at least 60% of peak value of 304 stainless steel alloy of substantially similar diameter of the wire core.

12. The wire of claim 9, wherein the weight percentage of the Cobalt is between 1.3% and 2%.

13. The wire of claim 12, wherein the elongated, flexible metal wire core is solely formed of the superelastic trinary alloy.

14. The wire of claim 13, wherein the superelastic trinary alloy exhibits a combination of column strength and kink resistance properties which fall between same properties of 304 stainless steel alloy of substantially similar diameter as the wire core and the binary Nitinol alloy.

15. A wire used for one of medical or orthodontia purposes, comprising an elongated, flexible metal wire core at least partially formed of a superelastic trinary alloy, the superelastic trinary alloy having greater column strength and stiffness than binary Nitinol alloy of substantially similar diameter of the wire core, and the alloy having greater extension flexibility than 304 stainless steel alloy of substantially similar diameter of the wire core, the superelastic trinary alloy formed via high temperature and torsion treatment straightening solely.

16. The wire of claim 15, wherein the superelastic trinary alloy consists of Nickel, Titanium, and Cobalt.

17. The wire of claim 16, wherein the superelastic trinary alloy has a weight percentage of the Cobalt less than or equal to 2% and weight percentages of the Nickel and of the Titanium greater than 40%.

18. The wire of claim 17, wherein the weight percentage of the Cobalt is between 1.3% and 2%.

19. The wire of claim 17, wherein the superelastic trinary alloy has both an upper plateau (UP) and a lower plateau (LP) from a 3-point bend test that are respectively greater than a UP and a LP from same 3-point bend test of the binary Nitinol alloy.

20. The wire of claim 19, wherein the UP of the superelastic trinary alloy is at least 60% greater than the UP of the binary Nitinol alloy.

21. The wire of claim 19, wherein the UP of the superelastic trinary alloy is at least 60% of peak value of the stainless steel alloy.

22. The wire of claim 17, wherein the elongated, flexible metal wire core is solely formed of the superelastic trinary alloy.

23. The wire of claim 22, wherein the wire exhibits a favorable combination of column strength and kink resistance properties, wherein the column strength and kink resistance properties fall between same properties of the 304 stainless steel alloy and the binary Nitinol alloy.

24. A wire used for one of medical or orthodontia purposes, comprising an elongated, flexible metal wire core at least partially formed of a superelastic trinary alloy, the superelastic trinary alloy exhibiting a combination of column strength and kink resistance properties falling between same properties of 304 stainless steel alloy of substantially similar diameter of the wire core and of binary Nitinol alloy of substantially similar diameter of the wire core, the superelastic trinary alloy formed via high temperature and torsion treatment straightening solely.

25. The wire of claim 24, wherein the superelastic trinary alloy consists of Nickel, Titanium, and Cobalt, and wherein the elongated, flexible metal wire core is solely formed of the superelastic trinary alloy.

26. The wire of claim 25, wherein the superelastic trinary alloy has a weight percentage of the Cobalt less than or equal to 2% and weight percentages of the Nickel and of the Titanium greater than 40%.

27. The wire of claim 26, wherein the weight percentage of the Cobalt is between 1.3% and 2%.