During a cardiac robotic surgical procedure using a davinci surgical system, the robot's 3rd instrument arm (arm4) stopped functioning.
The surgeon removed the instrument from the affected arm and placed it on arm1 after which the instrument tested okay.
The surgeon then tried unsuccessfully to reattach the instrument to arm4 three different times, as instructed by the manufacturer's clinical representative, who was present during this surgical procedure.
The surgeon had to make another incision in the patient to attach an atrium retraction instrument to complete the procedure.
The manufacturer representative finally placed arm4 in the complete stow position and redeployed arm to a cold reboot status.
After the reboot of arm4, the system was then able to detect the instrument and the surgeon completed the case without having to use the additional incision site, and without further robotic system failure.