A surgical instrument (22) including a coupler (33) maintaining an inner (54) and outer (52) members to define a cutting implement (30) and an aspiration control pathway between a first port (35) exposed at an exterior of the coupler (33) and a second port (103) connectable to a source of negative pressure (24) via. a lumen (105) of the Inner member (56), wherein the aspiration control mechanism provides user control over the level of vacuum applied at the cutting tip implement via selective positioning or a finger over the first port (35).
