✔ 最佳答案
There is no need.
What you can really need is an advance health care directive. This is uncommon in Hong Kong.
What this directive does is a specific form of power of authority. Basically, you appoint a person who make your health care decision for you. At the same time, this person, holding the power of attorney, can decide who can visit you or not.
Usually with this, an injunction is usually not required.
And it does not costs a lot.