Every time you have anything that goes through the skin, it's a potential source of infection. Once you put a device in the body and close the skin, if you didn't get much of anything infectious in with it the body will coat it in its own layer of proteins and then hopefully leave it alone. If you have wires or tubes that cross the skin, though, the film of bacteria that lives on everything (including our skin) will almost certainly make its way up the wire and into the body eventually.
So, you have to weigh the infection risk of external power with the battery life of anything you can put entirely in the body.
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Every time you have anything that goes through the skin, it's a potential source of infection. Once you put a device in the body and close the skin, if you didn't get much of anything infectious in with it the body will coat it in its own layer of proteins and then hopefully leave it alone. If you have wires or tubes that cross the skin, though, the film of bacteria that lives on everything (including our skin) will almost certainly make its way up the wire and into the body eventually.
So, you have to weigh the infection risk of external power with the battery life of anything you can put entirely in the body.
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