Cr, ni, mo and co alloy for use in medical devices

Patent metadata

Field	Value
Publication number	US-2017175235-A1
Application number	US-201615382294-A
Country	US
Kind code	A1
Filing date	Dec 16, 2016
Priority date	Dec 18, 2015
Publication date	Jun 22, 2017
Grant date	—

Abstract

One aspect generally relates to a Cr, Ni, Mo and Co alloy, with tightly controlled levels of impurities. One aspect relates to an alloy including about 10 to about 30 weight % Cr, about 20 to about 50 weight % Ni, about 2 to about 20 weight % Mo, about 10 to about 50 weight % Co, and less than about 0.01 weight % Al, wherein each weight % is based on the total weight of the alloy.

First claim

What is claimed is:

1 . An alloy comprising:
about 10 to about 30 weight % Cr; about 20 to about 50 weight % Ni; about 2 to about 20 weight % Mo; about 10 to about 50 weight % Co; and less than about 0.01 weight % Al; wherein each weight % is based on the total weight of the alloy.

2 . The alloy of claim 1 further comprising less than about 0.005 weight % Mg, based on the total weight of the alloy.

3 . The alloy of claim 1 further comprising less than about 0.005 weight % Ca, based on the total weight of the alloy.

4 . The alloy of claim 1 further comprising less than about 0.005 weight % Ce, based on the total weight of the alloy.

5 . The alloy of claim 1 further comprising less than about 0.1 weight % Ti, based on the total weight of the alloy.

6 . The alloy of claim 1 further comprising from about 0.0001 to about 1 weight % Fe.

7 . The alloy of claim 1 , wherein at least one of the following is satisfied:
a) the content of C in the alloy is less than about 0.1 weight %; b) the content of B in the alloy is less than about 0.01 weight %; c) the content of P in the alloy is less than about 0.01 weight %; d) the content of S in the alloy is less than about 0.005 weight %; wherein each weight % is based on the total weight of the alloy.

8 . The alloy of claim 1 , wherein at least one of the following is satisfied:
a) the content of Mn in the alloy is less than about 0.05 weight %; b) the content of Si in the alloy is less than about 0.05 weight %; wherein each weight % is based on the total weight of the alloy.

9 . The alloy of claim 1 , wherein at least one of the following is satisfied:
a) the content of 0 in the alloy is in the range from about 0.0001 to about 0.05 weight %; b) the content of N in the alloy is in the range from about 0.0001 to about 0.01 weight %; wherein each weight % is based on the total weight of the alloy.

10 . A method of preparing an alloy comprising:
a) providing of a mixture comprising:
i) Cr in the range from about 10 to about 30 weight %;
ii) Ni in the range from about 20 to about 50 weight %;
iii) Mo in the range from about 2 to about 20 weight %;
iv) Co in the range from about 10 to about 50 weight %;
wherein each weight % is based on the total weight of the mixture; b) melting the mixture in a vacuum induction melting step in order to obtain a first melt; c) solidifying the first melt in order to obtain a first solid; d) melting the first solid in a vacuum arc melting step in order to obtain a further melt; and e) solidifying the further melt in order to obtain a further solid.

11 . The method of claim 10 , wherein pressure in step b) is below about 10 −1 bar.

12 . The method of claim 10 , wherein the leak rate in step b) is below about 10 −1 bar/min.

13 . The method of claim 10 , wherein the pressure in step d) is below about 5*10 −2 bar.

14 . The method of claim 10 , wherein the leak rate in step d) is below about 5*10 −2 bar/min.

15 . The method of claim 10 , further comprising a homogenization step carried out at a temperature in the range from about 900 to about 1300° C.

16 . The method of claim 10 , further comprising a Cog step carried out at a temperature in the range from about 900 to about 1300° C.

17 . The method of claim 10 , further comprising a finish roll step carried out at a temperature in the range from about 900 to about 1300° C.

18 . The method of claim 10 , further comprising a straightening step.

19 . An alloy obtainable by a method of claim 10 .

20 . One of an electrical wire, a wire of a medical device, and a wire of a pacemaker device, comprising an alloy according to claim 1 .

Assignees

• Heraeus Deutschland Gmbh & Co Kg
• Saes Smart Mat Inc

Inventors

• Richter René
• Gebert Jörg-Martin
• Specht Heiko
• Sczerzenie Francis E
• Manjeri Radhakrishnan M
• Yin Weimin

Classifications

• A61N1/056

  Transvascular endocardial electrode systems · CPC title

• C22C30/00 Primary

  Alloys containing less than 50% by weight of each constituent · CPC title

• C22C1/02

  by melting {(C22C1/1036 takes precedence)} · CPC title

• A61N1/05

  for implantation or insertion into the body, e.g. heart electrode (A61N1/06 takes precedence) · CPC title