I'm not sure of the answer to your question. I know there is quite a process for a procedure to be considered as an advance directive. It has to be approved through the regulatory bodies of physicians working in conjunction with the nurse regulatory body. There have to be guidelines around it, and there are very specific ones. Not all procedures are advance directives. Certainly something like physician-assisted dying would have to go through a regulatory process.
On January 27th, 2016. See this statement in context.