In the past few years, if you look at the material lists of European and American medical device companies, you will find a very stable trend: more and more core components are shifting from traditional stainless steel to implant grade titanium alloys, with the most typical being ASTM F136 titanium wire.
Many procurement companies ask a question: why do we have to use Ti-6Al-4V ELI? Can't ordinary titanium do it?
The answer is actually very direct - the performance gap is too obvious.
Firstly, the strength. Although pure titanium (such as ASTM F67 Gr2) has good ductility, it is prone to fatigue problems in some high load scenarios, such as orthopedic fixation or dental connectors. The tensile strength of Ti-6Al-4V ELI can be stable above 860MPa, which is particularly critical at small sizes.
Next is the word 'ELI'. Many people overlook it, but it is the core of medical grade. What is ELI ELI stands for Extra Low Interstitial, it is the content of ultra low interstitial elements. To put it more simply, contaminants like oxygen, nitrogen, and carbon are tightly regulated which makes the material more stable and less prone to causing human rejection responses.
Another underestimated point is fatigue performance. Medical devices are not disposable, especially implantable products, which need to withstand long-term micro motion loads in the human body. The performance of Ti-6Al-4V ELI in this regard is much more stable than traditional materials.
Finally, there is processing adaptability. Nowadays, many medical devices are becoming increasingly sophisticated, such as nerve intervention guide wires and minimally invasive instruments, which require materials to be both thin and not break. At this point, if the material of 0.05mm grade ultrafine titanium wire is not "clean" and uniform enough, it is easy to encounter problems.
So you will find that in the high-end medical field, this material has almost become the default option rather than an "upgrade option".
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