What do you call the medical item that goes over somebody’s mouth and nose to provide them with oxygen?

What do you call the chamber into which sick babies are often placed while in hospital in the UK?

What is the sharp part of this 💉 called?

What is the more medical name for a cream that you put on your skin to help it heal?

If you’ve broken your leg, what do you place under each arm to help you to walk?

In hospital, if you need to be slowly given fluids into your body through your vein, what item is used? 

What is the sharp knife that a surgeon uses to cut through the skin called?