A balloon dissection apparatus for forming an anatomic working space alongside an elongate vessel in a body having a tunneling shaft having proximal and distal extremities. A flexible elongate substantially cylindrical balloon is carried by the tunneling shaft and has proximal and distal extremities....http://www.google.de/patents/US5601589?utm_source=gb-gplus-sharePatent US5601589 - Extraluminal balloon dissection apparatus and method
