An anonymous reader has correctly identified this as being for the aspiration of bone marrow. It's used specifically for obtaining this by sternal puncture. The important part is the adjustable collar on the needle which limits the depth to which the needle can penetrate. The idea is to get into the marrow cavity, but not perforate the posterior wall of the sternum, and the large pulsating organ behind it!
This instrument, and the collar on it, will be featuring in my next post.
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