A flexible piece of barrier material for use in preventing or minimizing adhesions and fibrous attachments following anterior lumbar surgery. In one embodiment, the barrier structure comprises a multiple level device shaped as a generally wider tongue to function as a barrier at or above the L4-5 level,...http://www.google.de/patents/US8157819?utm_source=gb-gplus-sharePatent US8157819 - Encasement prevention barrier for use in anterior lumbar surgery
