Blood clots?!?

I just googled it and its called a greenfield filter or IVC filter, sorry didn't get the name exactly right, but here is a website to help you.  You can also google it, there are many other websites reffering to this. I hope this helps you!!   http://en.wikipedia.org/wiki/Inferior_vena_cava_filter

Thanks again for the info!  It looks like some sort of medieval device, but sounds like it works.  LOL.  I'll ask my surgeon about it on Friday! Thanks.......you rock!