Stents, FD, coils and electromagnetic sensitivity

How far away in time are we from biodegradable brain stents, Flow Diverters and coils?
For instance, in an article on ncbi, there was a mention of “memory polymer composite for intracranial aneurysm”
but that article was dated 2015. Also there was a mention of magnesium and/or iron stents, is there any progress on that front ?
Thank you for your answers !

If my clips were biodegradable I’d be dead. I have no trouble whatsoever with having MRI’s or any other treatment with my clips in. I’ve had lots of unrelated medical treatments since because of breast cancer. Cheers.