a re - rollable membrane for wrapping around and protecting a cylindrical tissue having an injury site . the membrane includes a sheet of a porous matrix formed of cross - linked biopolymeric fibers . in one implementation , the sheet can be spirally rolled so that at least one portion overlaps another portion of the sheet and , upon absorption of a fluid , the overlapping portions adhere to each other closely so as to exclude penetration of cells . in another implementation , the sheet can be helically rolled to form a helix having a pitch of 2 mm to 40 mm and an inner diameter of 1 mm to 50 mm . also disclosed are methods for making and using such re - rollable membranes .