A cannula (1) comprising a central axis (2), a front end (3) and a through channel (5) coaxial or parallel to said central axis (2) and defining a peripheral wall (12) of said cannula (1), wherein A) said cannula (1) further comprises at least two perforations (8) penetrating said peripheral wall (12) transversely to said central axis (2) B) said through channel (5) is open at said front end (3) and C) the cross section of said through channel (5) has a contraction (6) with a diameter di located between the front most of said at least two perforations (8) and said front end (3) which is formed as a guidance for a wire (7). A device (10) for liquid jet irrigation of bone comprising such a cannula (1) and a wire (7).
