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The stiffness of three colonoscope shafts: the conventional colonoscope (200HL), the variable stiffness colonoscope in paediatric mode (VS paed) and at maximum stiffness (VS stiff), and the paediatric colonoscope. Stiffness was measured at 10 cm intervals along the shaft from the 20 cm mark using a tension gauge to depress each point by 5 cm when suspended across a 20 cm gap. Each value is the mean of three readings.
