I'm presuming PM is pacemaker and DEF is defibrillator. It may be that "chiavetta" is a defibrillator accessory?
"ECG monitoring via 3 lead cable
High resolution display
Memory capacity without audio recording, 7 hours of ECG data
Unlimited data storage via optional USB key."
http://www.medical-world.co.uk/p/accident-emergency/defibril...Unsure why something like that would need to be sterlised though!
In answer to your question, I don't think the term refers to 3 items, but possible "kit chiavetta" and "kit slitter".
