Head, shoulders, servo actuators and toes!

Hey all. Been checking out this ring of sites for a few days, so I thought I'd stop in and say hey. I am going to be doing a lot of research and possibly work on my first body hack (Probably a magnet, but we'll see).

But, I wanted to see y'alls opinion on, let's say, larger hacks. Has anyone got any ideas on Limb replacement or extreme modification?

My, issue I suppose, is that I have BIID (Body integrity Identity Disorder), which is to say in simple terms, I have a limb (My lower left neg from the knee down) that I... don't believe is mine. It is very difficult to describe but I want it... off my body. It doesn't belong. Anyway, that is the background. The real issue I present to you all is that I want a prosthetic, with an ITAP ( Intraosseous Transcutaneous Amputation Prosthesis) bone anchor, and neuro interfacing.

Have any of you done any research on any of this, or anything similar? Thoughts and suggestions? Comments and slander?


  • edited November 2017

    I love it, Ideologically speaking. It's a logical extreme of biohacking. I don't think I've ever seen it done, but more power to you.
    When you say neurointerfacing, did you have a specific protocol in mind? Something to look into, if you haven't already, might be targeted muscle reinnervation. It isn't purely neurological, since you still have the muscular interface, but it's effective and relatively easy. Relatively.

  • Well ideally, I would like to find a group doing research on neuro-interfacing and tell them to go nuts. I figure if I am going to have it removed, might as well help others in the process.

    Speaking of which, anyone know of groups doing this kind of research as well?

  • Have you looked into the Utah Electrode Array? I know that Warwick has one, and my university is doing extensive research on them. They aren't exactly commercially available though.

  • there's a bit more to it than just the electrodes and servos. Some decent introduction on the whole thing would be those 3 documents.

    DARPA and some lab in Sweden already have some success with what you plan to do.
    swedish team: http://stm.sciencemag.org/content/6/257/257re6 (sci-hub.ac is your friend)
    the darpa backed group (i think) DOI: 10.1056/NEJMoa1300126 (again sci-hub.ac)
    As for motors/servo systems you will end up with a force and position based closed loop servosystem. The kind of motor and gear you are looking for depends on your needs (not sure in terms of legs). Steppers are probably the worst choice here, brushless tend to run too fast but maybe some larger diameter types. Disk motors might be an option for high dynamic applications which I don't think is the right thing here either. As for gears and actuation it's about the same. Classic industrial gears such as the harmonic gear or cycloid gears are probably too stuff by nature, but could be made to work with an elastic coupling and a force based feedback loop of the motor. Turning the motor into linear action via spindles looks crazy cool but i don't think that's a good choice here. I'd put my money on motors with low moment of inertia, combined with a harmonic or cycloid gear (maybe 2 staged) and a proper feedback loop so you can control it with target forces instead of positions. Will eat electricity for breakfast but good enough to kick around.

    If everything else fails, hit up Hugh Herr. This guy build pretty the best thing you can buy (i think) without engaging in the all-neural-fun-playground

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