A surgical instrument for cutting a tissue includes a shaft, a cutting member, and an alignment system. The shaft extends along a longitudinal axis and includes a shaft opening. The cutting member is disposed within the shaft lumen to cyclically move from an open state to a closed state. The cutting member includes a sidewall, a cutting window, and a suction lumen. The cutting window opening in the open state aligns with the shaft opening such that the cutting window opening and the shaft opening are in fluid communication. The sidewall in the closed state aligns with the shaft opening such that the sidewall blocks fluid communication to the shaft opening for inhibiting suctioning the tissue therethrough. The alignment system urges movement of the cutting member moving the open state toward the closed state such that the cutting member stops in the closed state.
