It was reported that in or 17 the d series light disconnected from the spring arm.The cardanic separated from the spring arm and hit a nurse on the shoulder as it fell.This occurred during a procedure but there was no reported injury or adverse consequence to the patient.The nurse reported only bruising at the time and no medical intervention was required.A stryker field service technician (sfst) was dispatched for investigation.During his inspection, the sfst found that four mounting screws which are used to secure the cardanic arm to the surgical light had backed out.The sfst replaced the light head with a new light head and confirmed functionality.The service and installation history for the equipment in or 17 was reviewed.The service ticket database showed service history since april 2008 but there were no reports of maintenance, repairs, or adjustments that required light head maintenance or removal.The d series lights were sold between 1995 and 2009 and are no longer supported as units have exceeded their lifetime.This light has been in use for at least 10 years.Based on the physical evidence and the service history, the root cause of the separation would be loosening of the cardanic arm hardware due to improper maintenance by hospital personnel.
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