No lot number and no sample were available, so no documentary or sample investigation could be made.Furthermore, with additional information received we can define that the guidewire used with chiba needle was a zipwire¿ hydrophilic guidewire from boston scientific.According to the prescriptive information found in boston site these two medical devices were not compatible.On the boston document it was stated: "do not manipulate, advance and/or withdraw the zipwire hydrophilic guidewire through a metal cannula or needle.Manipulation, advancement and/or withdrawal through a metal device may result in destruction and/or separation of the outer polymer jacket requiring retrieval.If a needle is used for initial placement, a plastic entry needle is recommended when using the zipwire hydrophilic guidewire.Extreme caution should be observed when used with a one-wall puncture style needle." the damage observed on the guide wire was due to the incompatibility of this kind of guide wire with our chiba needle.A similar case study based on the item number rac018, over last four years identified no similar cases.A risk management framework evaluation was performed and concluded that residual risks are adequately controlled and reduced as far as possible, and the residual risks associated with the use of the product are acceptable when weighed against the benefits to the patient/user.A clinical assessment was performed and concluded that the incident of boston sc.Zipwire hydrophilic guidewire rupture at the tip is related to the use through a puncture needle instead of a ureteroscope.Therefore, such incident is considered as not related to the chiba needle.
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