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Chapter 3 Preparation and inspection before observation
2 Make sure that the hook assembly is composed of the spring shaft
and the hook attached to it.
CAUTION
• If the hook becomes trapped or caught in the inspection object, the hook will break at the slit
portion in order to allow scope withdrawal. Therefore, do not subject the hook to excess
force.
3 Make sure that the hook assembly is free from irregularities such as
buckling, stretching, part separation, crushing and excessive
bending.
CAUTION
• To prevent the spring shaft from being damaged or disconnected, pay particular attention to
the connections indicated by the arrows in figure above when performing the inspection
described below.
4 Hold the spring shaft at A and B as shown in figure below and pull
ends away from each other to check that the wires inside the shaft
limit coil extension when stretched to a certain point.
5 Confirm that the hook is not damaged and that it is securely
attached to the distal end of the spring shaft.
Hook Spring shaft
Hook assembly
Slits
Proximal endDistal end
AB
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