Assertion: endoscope's tube | /r/HasProperty | rigid
Facets:
Source sentences:
text: Or an endoscope can be used to place a rigid tube called a stent into a part of the digestive tract to help keep it open.
text: The tube may be flexible or rigid.
text: An endoscope usually is composed of a tube that is either flexible or rigid, depending on the type of endoscopic procedure to be performed.