In order to heal any soft tissue damage, such as a tear in the deltoid, you need blood flow. We all know that the most common and well known way for increasing circulation to a specific area is physical activity.
This, however, isn't always an option, especially for a shoulder injury that needs as much immobilization as possible. There is a BFST (Blood flow stimulation therapy) shoulder wrap that will actually promote nourishing circulation, while at rest. This is a great treatment.