A cylindrical, rod-like, manual surgical instrument intended to be inserted into the colon to explore/assess the colonic lumen, relieve colonic spasms, or dilate strictures during open-surgery procedures. It is designed with a semi-rigid tapered shaft that terminates at the distal end in a small, bulbous tip; it may be hollow for the passing of other slender devices through it. This is a reusable device.