I'm sure that as this man's partner, no one can stop you from visiting, although perhaps only so many people are allowed at his bedside, and if his immediate family are there every minute that they can be, then you may NOT be able to get in very easily. However, considering the severity of what's happened, most wards are quite accomodating. I went to visit a vague relative who was in a coma after having a car accident, and there was always a good few at his bedside. We played music to him and chatted away, and 3 weeks later, he came out of the coma. Best of luck anyway.