Despite multiple requests, no additional information has been received from the hospital regarding this event.
Intuitive surgical investigation has shown that it is possible for the electrosurgical unit (esu) currents to pass through the instrument arms to ground, through the cannula accessory to the patient, if the patient is not properly grounded or if the grounding pad used by the surgical staff is faulty.
As of (b)(4) 2012, the site has continued to use their da vinci si surgical system and there have been no reported recurrences of this issue at this hospital.
It was reported that after a da vinci si pulmonary wedge resection procedure was completed, a burn was observed at one of the port sites when the cannula accessory was removed from the instrument arm.
The burnt skin was excised, however, the patient was burnt all the way through the tissue.