A medical instrument comprises a funnel having a tube with opposite first and second ends, respectively, with a conical portion at the first end. Conical portion has an outer conical surface which increases in outer diameter in a direction from the second end to the first end. A mouth is provided at an end of the conical portion distant to the end, and a lip extends about a part of the circumference of the mouth. The lip protrudes from the conical surface. A first grip is formed axially along the tube and provides a visual reference to the lip.
