Cutter head with suction function and a method for using same

A cutter head for removing a mixture comprising water and solid materials from a bottom of a body of water, comprising rotating blades each provided with cutting means on a leading edge thereof, said cutter head being rotatably coupled to a tube for transporting said mixture, the shape of the leading edge of said rotating blades being defined by substantially fitting a rounded cone with a rotation axis, wherein each rotating blade at a middle part is fixedly coupled to a single connecting ring and at a top part is linked to a top part of another rotating blade,

• wherein the single connecting ring is positioned at an outer circumference of the rotating blades;
• wherein the rotation axis of said blades is aligned with a rotation axis of said single connecting ring;
• wherein a trailing edge of part of at least one of said blades is positioned closer to said rotation axis than a leading edge of said blades so as to provide a suction function towards said tube upon rotation of said cutter head;
• and
• wherein said blades as viewed from said top part at a bottom part of said blades extend to a position beyond said connecting ring and are positioned partly inside the tube;
• and
• wherein said single connecting ring is coupled to the tube, the tube and the single connecting ring rotating coaxially with respect to rotation of said blades.