Abstract
From the background information supplied by the inventors, news correspondents o btained the followingquote: “BACKGROUND TO THE INVENTION AND PRIOR ART“There are many structures, natural or man-made, that contain smaller tubular st ructures. An exampleof such a structure occurring in nature is the human body, which has tubular structures such as the intestineand oesophagus. An example of a man made structure may be a building having a network of plumbingpipework. I t is often necessary to survey the inside of the tubular structures whilst in si tu. However,where the tubular structures are very long and/or torturous and the refore difficult to reach, or in casessuch as the human body where it is necess ary to be as minimally invasive as possible, a device is requiredthat can easil y manoeuvre along the inside of the tubular structure whilst being controlled ex ternally.
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