I think what you describe are "dressing packs" and there designed for single use, not sure if that's for reasons of lack of sterilization facilities, etc. They had loads of them in a room at the local hospital when I had my finger injury treated.
https://www.medisave.co.uk/consumab...ssings/dressing-packs/all-dressing-packs.html
https://www.medisave.co.uk/consumab...ssings/dressing-packs/all-dressing-packs.html