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Hi guys, new here - not got much relevent experience, but i'm more than happy to learn all i can.
sorry for necro-ing, but I was reading a different thread yesterday (about tattoos as wiring), and a thought occured to me - why not use something like a scaled down endoscope to route a cable through the body? Shaedlaer said about two small incisions and a rod to make a channel for the cable to run through, well this would be similar. If you were to be able to cause the head of the endoscope to expand (like a bottle stopper kind of idea) you would be able to put it through a tube, expand the head to hold it in place in the tube, then route the tube through the body to where it needed to go.
This could be done through a smallish needle. this would also allow the 'snaking' of the tubing to allow it to compensate for joint mobility, etc
small endoscope to insert a PTFE tube under the skin, insert cable in tube.
Started some research on slack in the channel #subdermal-wire. There is a lot of information there already, mostly manuals from Medtronic's series of deep-brain stimulation devices.
They use silver core mp35n wire and medical silicone or fluoropolymer under polyurethane in various places. The connectors are stainless steal and use set-screws and terminal blocks.
As I said, details on slack and help with digging through everything appreciated there!