“…Other materials have been used as dural substitutes include synthetic polymers, such as ploy‐lactic acid (PLA), poly‐ɛ‐caprolactone (PCL), expanded polytetrafluoroethylene, polyurethane, polyethylene glycol hydrogels, and hydroxyethylmethacrylate hydrogels, and natural polymers, such as collagen, gelatin, fibrinogen, and alginate hydrogels. Some of these materials have been commercially available and have gained widespread use as onlay materials (e.g., GORE PRECLUDE ® MVP ® , DuraPatch ® , DuraMatrix‐Onlay™, and Gelfoam ® ) .…”