It was reported that, during a cori-assisted tka procedure, the robotic drill attachment was unable to lock onto the real intelligence robotic drill and continued to loosen up during robotic drill calibration process.A system fault warning message communication failure: please contact robotics customer support continued to occurred even after changing to another drill attachment.After retrying calibration for the fourth time and afterwards.Surgery was completed after a non-significant delay, with a back-up device.Patient was not harmed.
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The real intelligence robotic drill, part number rob10013, serial number (b)(6), intended for use in treatment, was returned for evaluation.The reported problems could not be confirmed with a visual inspection.The reported problem of the drill attachment not locking on was confirmed with a functional evaluation.During a test case and drill diagnostics, a drill attachment was able to be loaded but was unstable, without the tactile and audible locking in normally seen.The drill was disassembled and the rotating ring in the nose and motor housing was found to contain residue and was cleaned out.Degradation of the motor housing o ring was observed.When reassembled, the drill passed all kpcs and successfully completed a test case with a drill attachment securely locked on.The communication failure and calibration issues were not reproduced nor confirmed.A relationship between the reported event and the device was established.The most likely cause of this event is degradation of the o ring allowing ingress of material into the drill.Although the communication failure and calibration issues were not confirmed, contributing factors may be the residue in the motor housing causing intermittent electrical issues.A review of manufacturing and service records indicate the device met all specifications upon release into distribution.A complaint history review for similar reported/confirmed complaints has identified prior events.A historical review concluded that no prior escalation actions are applicable to the scope of the reported complaint.The failure mode and associated risk have been anticipated within the risk file.The risk level is still adequate.Based on the investigation, the need for a corrective action is not recommended or required at this time.Should any additional information be received the complaint will be reopened.The failure mode will continue to be closely monitored through complaint investigation and trended through post market surveillance activities.
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