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Batch review performed on 20 november 2018: lot 1852516: (b)(4) items manufactured and released on 21-sep-2018.No anomalies found related to the problem.To date, no similar event has been reported for this lot.Visual inspection performed by r&d project manager: breakage of the tip during screw insertion.Breakage can occur in case of high insertion torque, typically related to large diameter screws (>7mm), long screws (>60mm) and/or hard bone (e.G.Sacral bone, sclerotic bone).In such cases, bone tapping is recommended in the surgical technique as well as in pbn (b)(4).In this case, a screw ø7mm was inserted.Based on the information collected the surgeon the tap.The instrument set always includes a second pedicle screwdriver, and another "simple" screwdriver (ref (b)(4) or equivalent) to complete the surgery in case of breakage.The tip material and geometry is proven to withstand up to 9nm torque, which is a significant force for a pedicle screw insertion (note, 9nm is also the final tightening torque for the setscrew, that needs a t-handle and a countertorque to be applied.) - the strength of the tip of the screwdriver is driven by the dimensions (hexalobe t20) and the material (aisi x15-tn or equivalent) which are comparable to predicate devices.Geometrical features are driven by the implant design and are equivalent to similar products in the market.The material is among the strongest materials for such application in terms of strength and hardness.
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