A visual inspection on the device found the shaft broken off from the main body of the device at the proximal end.The metal section on the broken end of the shaft is twisted, which would suggest that excessive force was used to cause the shaft to become detached/broken.The instruction manual states the following; ¿do not twist or bend the bending section with your hands.Equipment damage may result¿.The instructions for safe use manual also indicates that, damage to the bending section would happen if excessive force was applied while angulating in the opposite direction if there was no movement from the bending section; this would occur more so in a narrow environment.Additionally, the image seen through the eyepiece lens is very unclear, which would also likely be attributed from the damaged shaft.Based on the evaluation, the likely cause of the damaged and broken shaft is due to mishandling in the form of excessive force.
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