Peristaltic pumping device and medical apparatus, in particular for dialysis, incorporating it

A peristaltic pumping device of linear type, comprising:

• a section of deformable tube crossed by a fluid whereon at least one peristaltic compression is implemented;
• and
• an actuator, comprising a rotating element provided with one or more helical ribs arranged to project from the surface thereof so as to interfere, along the rotation of the rotating element, with said deformable tube thereby causing thereon at least a localized, movable and continuous squeezing, moving along a predetermined direction, implementing peristaltic compression, said one or more helical ribs being spirally wound along a respective helical axis with respect thereto the position thereof is tied onto the surface of the rotating element,
• wherein at least one portion of said one or more helical ribs is rotatable with respect to said helical axis, and rotates therearound at least when said at least one portion of said one or more helical ribs interferes with said deformable tube, thereby minimizing the friction thereof on a tubular surface of the deformable tube.