http://youtu.be/bRJjcPBL7_0
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Its called an arm coil. Here's a version off of a failed D'arce. Another technique common in Sambo, mostly utilized from North/South position.
http://www.youtube.com/watch?v=u96-o63oVaA
I love the technique, this past November when my Sambo Coach Igor Yakimov was at my gym he showed me a few different ways to set it up, it is soooooo powerful.
And that is how you shatter an entire arm. Haha sweet.