I think the two part item with the spike might be a cannula. I’ve seen them in Welsh Social History collections, usually associated with veterinary treatments for bloat, a life threatening condition in dogs, sheep, cows. The spike is inserted into the tube, and then penetrates the stomach of the patient to create a small puncture wound. It is then withdrawn, leaving the tube in place, so the excess gas can drain out through the puncture.
A good source to consult would be The Wellcombe Collection in London.