Apparatus and methods are provided for placing and advancing a diagnostic or therapeutic instrument in a hollow body organ of a tortuous or unsupported anatomy, comprising a handle, an overtube, a distal region having an atraumatic tip. The overtube may be removable from the handle, and have a longitudinal...http://www.google.com/patents/US6790173?utm_source=gb-gplus-sharePatent US6790173 - Shape lockable apparatus and method for advancing an instrument through unsupported anatomy
Shape lockable apparatus and method for advancing an instrument through ...
