Does milk come in contact with the water in the breast shield assembly? Natalie March 20, 2017 23:19 Follow The Naya Smart Breast Pump uses a closed system which prevents milk from coming into contact with the water in the system. Related articles What’s so special about your pump? What if the lights on the front panel don’t turn on? What happens if my tubing begins to leak water? The Naya Smart Breast Pump is “hospital grade.” What does that mean? Is this a regulated device? Comments 0 comments Article is closed for comments.