Tiny
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Ok, I'll bite.
What in the sugar do you use that for? Pediatric cardiac?
Yup. It's a sternal retractor.
Here's an adult version:
I have to wonder how small an infant has to be for using that retractor. Smallest kid I ever put to sleep was on a Saturday morning in 1978. Weighed 750 grams (that's about a pound and a half). He had a PDA that needed ligating.