The reported event was confirmed, however the cause was unknown.A photo sample of a stone basket was returned.A portion of the brown sheath found to be separated from the rest of the basket.A potential root cause for this failure mode was unable to determine.As the cause was unknown, it could not be determined whether the device had met specifications.As the sheath was found to be removed from the device, it appears to be a relationship between the reported event and the device.The device used for the treatment.The device history record was reviewed and found nothing that could have caused or contributed to the reported event.The instructions for use were found adequate and state the following: "indications for use: this device is intended for use in the endoscopic removal of renal and ureteral stones.Warnings: ¿ some objects may be too large to be removed endoscopically using a retrieval device.The use of fluoroscopy and/or x-ray to determine the size of the object is recommended; do not use the platinum class¿ flat wire basket if the object is too large to be removed endoscopically.After use this product may be a potential biohazard.Handle and dispose of in accordance with accepted medical practices and applicable laws and regulations.¿ this is a single use device.Do not re-sterilize any portion of this device.Reuse and/or repackaging may create a risk of patient or user infection, compromise the structural integrity and/or essential material and design characteristics of the device, which may lead to device failure, and/or lead to injury, illness or death of the patient.Cautions: objects that are too large to be recovered through the sheath or through the scope channel will require the scope and basket to be removed simultaneously from the urinary tract.If resistance is encountered during advancement or withdrawal of the device, stop and determine the source of resistance, as continued resistance may damage the device and could result in patient injury.Take action to alleviate the resistance.Where necessary, use of a lithotrite may be required to reduce the stone burden within the basket, provided that no direct contact is made with the stone basket.Precautions: do not allow the device to come in contact with any electrical equipment.Do not rotate an open basket in the ureter.Potential complications that may result from the use of a basket in an endoscopic urological procedure include but are not limited to: ¿ perforation ¿ edema ¿ evulsion ¿ entrapment ¿ basket inversion ¿ inability to disengage from ¿ hemorrhage irretrievable object directions for use: only physicians trained in stone manipulation should perform this procedure.A variety of techniques in the use of this instrument may be employed; however, the physician should use the technique with which he/she is most familiar.1.Inspect the device prior to use and during the procedure.2.Retract instrument tip into sheath.3.In the closed position, insert the instrument into the ureteroscope working channel and advance the ureteroscope into the ureter or renal pelvis.4.With the basket closed/retracted, advance the instrument to the object to be removed.5.Push forward on thumb control knob to advance basket between object and ureteral wall.Once the object has been captured, partially close the basket to secure the object for removal.6.Simultaneously withdraw the basket and the ureteroscope from the urinary system.Handle disassembly/reassembly: if handle removal is desired: 1.Unscrew the thumb screw located on the basket handle.2.Gently pull backward on the handle, releasing both the handle and sheath from the drive wire/basket combination.If any resistance is felt at this stage, stop and determine cause of resistance.3.Once the stone burden within the basket has been removed, the basket can be closed using an open tip ureteral catheter.4.The basket can be reassembled easily by inserting the drive wire into the sheath and advancing until it reaches the handle.5.Tighten the thumb screw to secure the drive wire in place.".
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