This report is being submitted as follow up no.1 to provide additional information to sections b5, b6, d4, h4, h6; to provide the device return date in section d9, update section h3, and to provide the completed investigation results.The actual sample was returned for product evaluation.The provided photo was confirmed.It was found that the contrast marker remained in the patient's body.Visual inspection of the actual sample upon receipt found that the distal end of actual sample had been fractured.Magnifying inspection of the fractured section of actual sample found that the outer layer (approximately 2 millimeters) and the contrast marker were missing.The inner layer was exposed due to these missing parts, and the trace of contrast marker was found.Re-visual inspection of the actual sample found that the catheter shaft had been wavy and had been elongated at the distal end approximately 500mm from the distal end.Therefore, it was inferred that pulling force was applied to the involved section.Magnifying inspection of the actual catheter found that it had been crushed at approximately 140mm and 430mm from the distal end, in addition to the waviness and elongation found during the investigation.Therefore, it was inferred that pulling force was applied to the involved section.Electron microscopic inspection of the fractured section of actual sample obtained following results: i) the outer layer had been torn and fractured; ii) the inner layer had been deformed and flared to the distal side; iii) it had been abraded in the vicinity of fractured section.Therefore, it was inferred that some hard object (e.G., stenotic lesion) came into contact with the vicinity of the fractured section.The outer and inner diameters of the actual sample (normal section) were measured and confirmed to meet the specifications.Review of the manufacturing record and the shipping inspection record of the involved product code/lot number combination confirmed that there were not any anomalies in them.A search of the complaint file found no other similar report with the involved product code/lot number combination from other facilities.Based on the investigation result, as a possible cause, this case was likely to have occurred by the following mechanism.The distal end of the actual sample was trapped by some hard object (e.G., stenotic lesion).Since the catheter was removed, the catheter shaft was wavy and elongated.Then, as a result of continued pulling force, the outer layer at the distal end fractured, and remained on the distal side together with the contrast marker.Regarding the crushing of actual sample, it was inferred that the involved section was held during the catheter removal operation.However, it was not possible to clarify when it occurred.For future use, warning found in the instructions for use (ifu) of this product should be noted, as appropriate: "[directions for use] if any resistance is felt, do not remove the catheter by force.Withdraw the catheter carefully together with the guiding catheter.Removing the catheter by force may result in the catheter breakage/separation, which may necessitate retrieval." ashitaka factory has been making efforts in maintaining the quality of this product by the following controls.As an assurance of catheter lumen, the catheter is always flowed in the production process with a core wire inserted in the lumen.In the product assembling process, the outer diameter of catheter is inspected on 100% basis to assure that there is no anomaly on it.After the product assembling process, 100% insertion inspection is performed with the core wire that is in accordance with the maximum applicable guidewire diameter.Before the product packaging process, 100% visual inspection is performed to assure that there is no anomaly including a crush, fracture, waviness or elongation.
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