An obturator assembly comprising an obturator housing, an obturator member and an obturator sleeve is disclosed. The obturator member is mounted to the obturator housing, defines a longitudinal axis, and has proximal and distal ends. The obturator member includes an interchangeable obturator rod and a penetrating end. The penetrating end defines a substantially planar dissecting segment and a central rod segment extends from the planar dissecting element. The obturator sleeve is coaxially mounted about the obturator member and is adapted for reciprocal longitudinal movement between a retracted position and an extended position.
