Securing graft tissue in a bone tunnel and implementations thereof

An anchor, comprising:

• a cylindrical body having a central longitudinal axis, a most proximal end, a most distal end and an inner surface and an outer surface, the body being formed of a plurality of integrated segments wherein a portion of the outer surface of each integrated segment of the plurality of integrated segments tapers away from the central longitudinal axis extending from the distal end to the proximal end, a most proximal end surface of each integrated segment of the plurality of integrated segments is wider than a most distal end surface of each integrated segment of the plurality of integrated segments;
• the inner surface defining a central bore, the cylindrical body having a slot exposing the central bore, the slot having a helical path around the central longitudinal axis and through at least one of the plurality of integrated segments that taper away from the central longitudinal axis, wherein the slot is configured to expand axially so that the cylindrical body changes from a first state to a second state in response to pressure on the inner surface, and wherein an outer diameter of the cylindrical body in the second state is larger than the outer diameter of the cylindrical body in the first state.