Event summary: as reported, the basket wire of an ncircle tipless stone extractor broke during an unspecified procedure.A second device was used to successfully complete the procedure.A section of the device did not remain inside the patient¿s body.The patient did not require any additional intervention due to this occurrence.The patient did not experience any adverse effects due to this occurrence.Investigation - evaluation: reviews of the complaint history, device history record, instructions for use, manufacturing instructions, and quality control procedures and a visual inspection and functional test of the device were conducted during the investigation.One ncircle tipless stone extractor was returned for investigation with the handle and basket formation in the open position.The male luer lock adapter was loose, and the collet knob was tight and secure.The polyethylene terephthalate tubing measured 2.6cm in length.A function test determined the handle actuated the basket formation.One wire was pulled out of the distal cannula.A document-based investigation evaluation was performed.No related non-conformances were recorded, and there have been no other reported complaints for this lot number.The device history record review provides objective evidence that the device was manufactured to specification.There is no evidence of nonconforming devices from the complaint lot in house or in the field.There were no identified gaps in the manufacturing instructions or quality control procedures.Cook has concluded that sufficient inspection activities are in place to identify this failure mode prior to distribution.The device is provided with instructions for use which caution, ¿enclose the device in the sheath before removing from the tray/holder,¿ and, ¿do not use excessive force to manipulate this device.Damage to the device may occur.¿ the reported issue was found during the use of the device, which indicates the wire was secured before use.Based on the available information, cook has concluded that a cause for this event could not be determined.Possible causes include the basket having been assembled incorrectly, without enough glue applied to securely hold the basket wire in place; procedural factors encountered when removing the stone(s) pulled on the basket wire with enough force to pull it free from the basket cannula; or a combination thereof.Cook will continue monitoring of similar complaints and have notified the appropriate personnel of this event.Per the quality engineering risk assessment, no further action is required.This report is required by the fda under 21 cfr part 803 and is based on unconfirmed information submitted by others.Neither the submission of this report nor any statement contained herein is intended to be an admission that any cook device is defective or malfunctioned, that a death or serious injury occurred, nor that any cook device caused, contributed to, or is likely to cause or contribute to a death or serious injury if a malfunction occurred.
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