| 摘要 |
The tube (1) has spiral tubular units (2, 3) with central ends (42, 43) and peripheral ends (52, 53) that are extended by rectilinear tubular units (62, 63). The tubular units have the same diameter and the units (2, 3) are integrated through their central ends. Each of the units (2, 3) is constituted by two arcs of a circle of 180 degrees. The units (2, 3) are positioned before their integration so that the unit (3) is subjected to a rotation of an angle of 180 degrees with respect to the unit (2) such that the sections (7, 8) of the units (2, 3) form a reversed S. |
