An internal treatment apparatus for a patient having a flexible tubular body to be introduced into a patient includes a center opening for inserting therethrough an endoscope for observing a target site, the center opening being circular in cross section and disposed at a center of an end face of the...http://www.google.co.uk/patents/US20080051629?utm_source=gb-gplus-sharePatent US20080051629 - Internal Treatment Apparatus for a Patient and an Internal Treatment System for a Patient
