The functional purpose of turned cuffs is to protect the material from fray and, when frayed, to allow the cuffs to be repaired or replaced without major changes to the garment.
Turned cuffs are mainly used on men's shirts; types include french cuffs and button cuffs (also called barrel cuffs.)
Devices for non-invasive measurement of blood pressure use an inflatable band placed on the upper arm or wrist which is also called a cuff.