The vacuum anchors {HEAD ~ the surrounding tissue} and mediates against {TAIL ~ the “tenting}” of tissue during electrode penetration 
The vacuum anchors { HEAD ~ the surrounding tissue } and mediates against { TAIL ~ the “ tenting } ” of tissue during electrode penetration
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH