(b)(4).Investigation / evaluation: no product was returned; therefore, no physical examinations could be performed.However, during the course of investigation, a review of documentation, drawing, instructions for use (ifu) manufacturing instructions and quality control was conducted.An instruction for use is provided that contains cautions for use.Specifically, it cautions ¿do not force components during removal or replacement.¿ ¿individual variations of interaction between stents and the urinary system are unpredictable.Periodic evaluation via cystoscopic, radiographic, or ultrasonic means is suggested.¿ the device is manufactured per manufacturing instruction and drawing.It is inspected per quality control specification.There is no evidence to suggest the product was not made to specifications.It should be noted that perinephric hematoma is a recognized adverse event from ureteroscopic lithotripsy and pcnl procedures, and not necessarily tied to the device.The appropriate internal personnel will be notified and we will continue to monitor for similar events.No additional risk reduction activity is required.
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