The articulated bending section body (5) comprises a number of segments including a proximal end segment, a distal end segment and a number of intermediate segments (8). Each intermediate segment (8) has a central passage (12) adapted in cross-sectional shape to receive and support the exterior surface of a bendable tubular member (14) providing a working channel of the endoscope (1). The cross-sectional shape comprises a number of sectors (15) of a circular periphery having a shared centre and the same radius, the total length of said sectors being longer than half of said circular periphery. The cross-sectional shape comprises at least one outwardly extending lobe (16). The exterior surface of the bendable tubular member (14) providing the working channel of the endoscope forms a closed lumen adjacent but separated from the working channel of the endoscope.
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