The device was inspected and tested on 10th may 2019.Within this inspection functional testing and visual inspection was made.Results: torque screw of a competitor was used with the clamp.Clamping pressure torque screw (competitor) was too low.Helicoil was turned out of the adjustable arm.Due to the use of a part, of a competitor, within the device we can not ensure the secure use of the skull clamp.The malfunction of the helicoil might have been caused by the third party device.However it can be excluded that the malfunction of the helicoil caused an increased pressure on the pin.As the competitors torque screw pressure was too low we suspect, that the pinning area of the skull had a precondition and that the pins were applied with too much pressure.
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