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 application_number US 20348408 A description the invention relates to a resorbable semipermeable cell occlusive biocompatible re rollable membrane for wrapping and protecting an injured tissue such a membrane can be implanted around damaged cylindrical tubular tissues or organs e g peripheral nerves or tendons to protect them from scar formation and to assist in wound healing fig1 a and 2 a show two exemplary membranes of this invention either spirally rolled or helically rolled referring particularly to fig1 a the membrane of this invention is a spirally rolled sheet 100 along its longitudinal axis u201c a u201d the sheet has thickness u201c t u201d and a height u201c h u201d when unrolled by an external force the sheet has a length u201c l u201d as shown in fig1 b preferably the length and height of the sheet is sufficient to wrap an injured tissue with a diameter of up to 5 cm and a length of up to 20 cm however size greater than that described herein can also be fabricated if needed refereeing particularly to fig2 a the membrane of this invention is a helically rolled sheet 200 with a thickness u201c t u201d shown in fig2 b a height u201c h u201d a width u201c w u201d a pitch u201c p u201d and an inner diameter u201c d u201d when unrolled by an external force the sheet has a length u201c l u201d as shown in fig2 b type i collagen fibers are the preferred material.