Lyric discussion by TANSTAAFL 

Er, guys, a Catheter isn't installed in the heart. At least, not normaly. It is a tube used to remove waste from coma victims and those who are bed ridden. As in a tube that goes into the bladder. Not pleasent image. But it makes more sense with some of the lines.

way to go, ass. its used to remove ANY waste, from any part of the body, be it blood vessels, or you (being an ass)

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