What is the best biomedical material for a spring implant? 1

[Rakan Alhourani]

HI,

I am developing a spring designed to be used in direct connection with the eye.
What are the biomedical materials that I can use for a spring (biocompatible and non-magnetic material)

Thank you!

 

[MagBen]

Elgiloy or Phynox CoCr-based alloy with a high E modulus and excellent corrosion resistance. they are biocompatible and non-magnetic as well.

 

[Rakan Alhourani]

MagBen

thank you!

What is the metal number of it? is it ASTM F562?

 

[MagBen]

astm f1058, iso 5832-7, ams 5833/34 (wire), ams 5876 (strip)

 

[Rakan Alhourani]

Is it the same CoCr used in Coronary Stents?

 

[MagBen]

Kinda.
Maybe MP35N (ASTM F562) and L650(astm f90) are more commonly used for stents, these two alloys can also been used for spring.
Elgiloy could also be used for Cardiovascular Stents, but in terms of spring, this maybe the best. due to that, it is also very popular in watchmaking industry.

 

[Rakan Alhourani]

Could I use Ti 64 ELI OR SS 316LVM OR NiTinol SE 508? Please tell me which material is the best considering long life span expectancy for spring and considering biocompatibility. And what is the difference between SS 316L and SS 316LVM?

 

[MagBen]

Titanium has less than half of modulus, and lower strength level. in 316LVM, L is for low carbon, VM seems to stand for vacuum melted. we treat AOD + ERS and AOD + VAR or VIM+VAR re-melted low carbon (<.03%) 316 as 316LVM. For implant applications, cleanliness is critical, you cannot use ARC melted 316L for that purpose.

 

[Rakan Alhourani]

Thank you!

 

[Rakan Alhourani]

MagBen

I appreciate your help!

I will go with your advice (Elgiloy CoCr-based alloy), but I need to know if the surface is going to be sticky or slippery? I need it to be slippery because the spring will be kept sliding.

Please could I contact you at your email for further details? feel free to contact me at rejalhourani@gmail.com.

Thank you!

 

[MagBen]

You can ask for a polished surface, or even specify a max surface roughness. For "sticky", you could ask for a glass bead texturized surface

 

[Rakan Alhourani]

Thank You!