A surgical drape for providing a localized instrument sterility barrier includes: a tube having a proximal end and a distal end, the tube defining an interior bore sized to receive an elongated shaft of a surgical instrument; and a port coupler at the distal end of the tube, the port coupler configured to couple the distal end of the tube to a surgical port through which the elongated shaft extends. The tube is collapsible to accommodate relative movement between the instrument and the surgical port during a surgical procedure.