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The device was returned to olympus for evaluation and the evaluation found that the balloon was in a deflated state, the fixation part on the rear end of the balloon had shifted toward the distal end, the hole for inflating and deflating the balloon was blocked by the fixing part on the rear end of the balloon, there was a slight deviation in the fixation part on the rear end of the balloon, and the balloon could be inflated and deflated by moving the fixed part on the back end of the balloon to it's original position with a finger.The investigation is ongoing.A supplemental report will be submitted upon completion of the investigation or if any additional information is provided by the user facility.
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This report is being supplemented to provide additional information based on the legal manufacturer's final investigation.A review of the device history record found no deviations that could have caused or contributed to the reported issue.Based on the results of the investigation, a definitive root cause of the reported balloon catheter not deflating issue could not be determined, however, this issue was likely due to: 1) a heavy load applied to the balloon during foreign matter collection.2) the fixing part on the rear end of the balloon was damaged and shifted toward the distal end.3) the hole for inflating and deflating the balloon was blocked, making it impossible to deflate the balloon.The event may be detected/prevented by following the instructions for use which state: ·do not use the balloon catheter to retrieve a calculus that is larger than the fistula or lumen size.Doing so could cause patient injury such as bleeding or mucous membrane damage.It could also burst the balloon or cause the balloon to become stuck in the fistula or lumen, resulting in the distal end of the instrument breaking off and remaining inside the fistula or lumen.Do not use balloon catheters to retrieve stones larger than the fistula or lumen.There is a risk of major bleeding, mucosal damage, balloon rupture, or the balloon cannot be removed from the fistula or lumen and the tip may break off and remain within the fistula or lumen.·the volume of the air in the balloon should not exceed the parameters specified in the tables in chapter 8, ¿specifications¿.Otherwise, the balloon may burst or may not deflate properly.When the balloon does not deflate, do not operate the balloon catheter with excessive force.Otherwise, the distal end of the instrument may break off and could remain inside the patient.Do not inject more air or saline (b5-2c only) into the balloon than the specified amount shown in the table in "2.2 specifications" on page 8.The balloon may burst or fail to deflate.Additionally, if you apply excessive force to the balloon catheter when the balloon is no longer deflated, the tip may break and remain in the body.·do not operate the instrument abruptly or with excessive force when retrieving a foreign object.Otherwise, patient injury such as bleeding, mucous membrane damage, or edema may occur.Do not use excessive force to remove foreign objects or remove them suddenly.There is a risk of severe bleeding, mucosal damage, edema, balloon rupture, or the balloon becoming unable to deflate and exit the insertion site.·if the balloon cannot be deflated, withdraw it using an appropriate method determined by the specialist.If an excessive force is applied on the balloon catheter when the balloon cannot be deflated, patient injury such as bleeding, mucous membrane damage, or edema may occur.It could also cause the balloon to burst or the distal end of the instrument to break off, which could remain inside the patient.If the balloon no longer deflates, pull it out using appropriate methods based on your professional judgment.If you apply excessive force to the balloon catheter when it is no longer deflated, there is a risk of major bleeding, mucosal damage, edema, rupture of the balloon, or breakage of the tip, which may remain in the insertion site.Olympus will continue to monitor field performance for this device.
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