The subject device was returned to olympus medical systems corp.(omsc) for evaluation.The needle could not be extended from the outer tube.Injection could not be performed while the slider was pushed, but injection could be performed while the slider was pulled.The outer tube was not buckled.The needle tube was compressive buckled.The manufacturing record was reviewed and found no irregularities.Based on the past similar cases, it was known that the frictional resistance between the outer tube and the needle tube increased due to the bending of the tube or pushing the slider fast, and then the needle tube was compressive buckled when the needle was extended and injection could not be performed.The above device handling has warned in the instruction manual as follows.*before use, confirm that the needle and the insertion portion are not damaged.If any abnormalities such as significant deformations or excessive bends are found, do not use the instrument.Otherwise, it may cause perforation, bleeding, mucous membrane damage.*straighten out the instrument before inspecting it.The instrument can be damaged if it is coiled while the handle is operated.*operate the slider slowly, otherwise the tube could buckle.
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