Surgical instrument

A surgical instrument wherein said surgical instrument comprises:

• a cannula comprising a conduit, said conduit comprising an inlet orifice and an outlet orifice, said cannula having a longitudinal axis L;
• a first distraction rod comprising a first intermediate portion with a longitudinal axis L1 and a first distal part,
• a second distraction rod comprising a second intermediate portion with a longitudinal axis L2 and a second distal part,
• wherein the first distraction rod is pivotally mounted about the longitudinal axis L1, and the second distraction rod is pivotally mounted about the longitudinal axis L2;
• and wherein the first distal part and the second distal part are configured so that the pivoting of the first distraction rod about the longitudinal axis L1 and/or the pivoting of the second distraction rod about the longitudinal axis L2 cause(s) the displacement of the first and second distal parts closer to or away from each other.