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Yeah, I read a short bit about using a bistoury to open the bladder up to remove stones. It gave me phantom pains down below imagining it.

I'm pretty sure that's a bistoury.:tameshigiri:

Check out Zak's post of surgeon tools in this thread.
http://straightrazorpalace.com/show-tell/110578-not-razor-but-very-interesting-old-knife.html