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