| http://www.w3.org/ns/prov#value | - the overtube over a colonoscope; [0034] the overtube being of a material which is thermally stable in use. [0035] Because the overtube is of a thermally stable material, the stiffness of the overtube may be chosen to be sufficiently flexible for ease of insertion into a colon, and to remain sufficiently stiff within the colon to maintain a section of the colon, such as the sigmoid colon, in a str
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