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I would argue it is actually quite easy to get a hammer into a body. Precision and accuracy are the larger concerns.
If you simply get a large enough hammer those concerns go away.
Or smaller, depending on point of entry.
The list of things that doctors want to stick up there gets longer and longer.
What if we insert it and used a MRI machine to steer it at the speed of sound
I would argue it is actually quite easy to get a hammer into a body. Precision and accuracy are the larger concerns.
If you simply get a large enough hammer those concerns go away.
Or smaller, depending on point of entry.
The list of things that doctors want to stick up there gets longer and longer.
What if we insert it and used a MRI machine to steer it at the speed of sound