I did laser surgery in the hospital postoperative bleeding ice packs but ice packs have been used by others, and written "used as medical waste" I'm afraid of contracting a disease.

The ice packs themselves can be recycled, that's true, but as a medical supply, an ice pack can only be used on the same person, and the hospital is just trying to cut costs. In fact, the ice packs are very cheap, and they belong to a class of medical supplies, so you can buy your own ice packs and use them yourself.