Whether it is used in humans or in animals, the endoscope must be at peak efficiency at all times. This is such a useful device that could save lives, and it must be handled and maintained properly so it won't compromise the results of any tests and examinations. Endoscopes are very fragile, and only a trained professional should use it when performing procedures.
It is important to do routine checks on the device before and after using it. Check for dents or any ridged parts. If you believe that these minor damages could affect the results of the tests performed, call a professional repair service right away. Also, as a user, you have to learn how to do the leak testing. Do it regularly as leakage could lead to serious damages in the future.
Additionally, before and after each use, clean the equipment based on the manufacturer's examples. Use only approved cleaning agents, and store the device in a safe, cool, and dry place.