What is this "buttonhole technique" I keep hearing everyone talking about?

Dialysis treatment. The buttonhole technique is a term used for inserting a blunt needle into a vein/fistula of a person who is undergoing blood/hemodialysis. It is less painful as the blunt needle traverses a tract which has been created by a needle, so it is like a button going into a button hole.
Laparoscopy. That is doing surgery by passing a scope into the body through a small cut instead of opening the abdomen.