An apparatus for spreading tissues. The apparatus includes a sheath member including an open end, a closed end, and a barrel extending between the open end and the closed end； and at least one flap-tip for engaging with tissues, wherein the at least one flap-tip is attached to the sheath member, each flap-tip projecting from the sheath member, wherein the at least one flap-tip is moved in response to movement of the sheath member.
