Neuralink has previously discussed their implantations in monkeys, in which they claim implantations for > 1 year with increasing performance (e.g., in their deep dive on youtube [1]). That would seem to indicate that this wasn't seen in animal studies (maybe just a matter of degree). Figure 04 they have in the article suggests a steady state may have been reached with respect to some factors, but I guess they could continue to improve things on the model side while still experiencing degradation if the improvements outpace the effect of degradation. Since this doesn't seem to impact safety, it doesn't seem like a follow-up surgery would be needed as long as the device continues to be useful; if it essentially became a brick then the patient would probably want it removed (which requires another surgery). They've never talked about any surgeries for "maintenance" before, and given the size of the threads, I doubt the same previously implanted ones could be reinserted.1. Neuralink Show and Tell, Fall 2022 (https://www.youtube.com/watch?v=YreDYmXTYi4)
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