A cover tube, which is formed to be opened only at its upper surface and closed at its remaining portions, is disposed so as to be attachable and detachable beneath a hanger for suspending and holding an endoscope or an endoscope treatment member and so as to surround the tip end portion of the endoscope...http://www.google.fr/patents/US6716159?utm_source=gb-gplus-shareBrevet US6716159 - Endoscope holding apparatus
