The field service technician (fst)was onsite for further investigation.According to the service report# (b)(4) dated on 2018-11-14 following was found: the fst observed the system and duplicated the error.The fst troubleshot the system and determined the control board was defective and replaced the control board (material# 701034051, serial# (b)(4)).Unit passed all calibration, functional and safety tests performed.Unit was returned to customer and cleared for clinical use.In the course of the investigation of (b)(4) all complaints were analyzed individually to look for patterns and causes.After evaluation of the complaints, the following defects are the most common: hot plug, sig error followed by head error, error message due to shaking / error message due to sensitivity, connection problems and hardware-error.The increase in complaints with the error "head error" is due to a user/application error.The actions have been addressed in the past to prevent application errors.Furthermore, the instructions for use of the rotaflow system, see rotaflow system user manual, mcv-ga-10000703-de-11, contain detailed descriptions to prevent an "error head".In addition, the instruction manual describes how the user has to react in case of an error message so that the application can be continued if possible.Since there are several causes of errors that result in an error head (error head) message, no final root cause could be determined.It is noticeable that the evaluated error is largely due to a user error.Warning in the ifu regarding "hotplug" and label with the "hotplug" warning on the rfc have already been implemented in the past.(b)(4).A follow-up medwatch will be submitted when additional information becomes available.(b)(4).
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