I am looking for a manga, in which a man goes back in the pass to save his son.

I remember that once in the pass we realize that he was betrayed by his wife and his other son.

Him or this son of a porter a collar who maintains these vital functions.

I don't really grasp what you mean with the last sentence, but maybe this webtoon called Rebirth?
https://www.webtoons.com/en/fantasy/rebirth/list?title_no=1412

The man goes back to the past to save his son and he has this sort of collar machine thingy that monitors his heart rhythm.

Love you, Is him.. I go read him again