The present invention relates to a method for directed cell in-growth and controlled tissue regeneration to prevent post-surgical or post-traumatic adhesion and fibrosis formation on the injured surface of a tissue selected from the group consisting of spinal column tissue, dura mater, and spinal nerves in a mammal, comprising the step of providing, covering and separating the tissue with a bioactive biofunctional, non-porous, microscopically multilayered collagen foil biomatrix, and to a method for treating a defect in a mammal comprising the step of providing, covering and separating said tissue with a bioactive biofunctional, non-porous, microscopically multilayered collagen foil biomatrix.
