The tube (100) has a cross sectional region comprising two cross-sectional segments (1, 3) with different extents of curvature, where the tube is made of thermoplastic rubber with hardness of 60. The segments are differently curved in a state of non-use and a state of measurement. The segments include a concave curvature relative to an extremity of a patient in one of the state of non-use and the state of measurement. The cross sectional region has a sickle-shaped, closed cross section relative to the extremity in the state of measurement. Independent claims are also included for the following: (1) a sphygmomanometer cuff provided with a tube and a cuff connection (2) a method for manufacturing a sphygmomanometer cuff (3) a method for measuring blood pressure.
