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(b)(4).The device was not returned for analysis.The lot history record (lhr) could not be reviewed and a similar incident query could not be performed because the product was not returned for evaluation and the lot number was not reported.The reported patient effect of perforation is listed in the rx herculink elite renal and biliary stent system instructions for use, as a known potential complication associated with the use of the device.The investigation was unable to determine a conclusive cause for the reported stent dislodgment.The patient effect and treatment were due to operational context.There is no indication of a product quality issue with respect to the design, manufacture or labeling of the device.
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