The application of vacuum draws {HEAD ~ mucosal tissue} against {TAIL ~ the carrier} and prevents movement of the sphincter region while the electrode penetrates tissue 
The application of vacuum draws { HEAD ~ mucosal tissue } against { TAIL ~ the carrier } and prevents movement of the sphincter region while the electrode penetrates tissue
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH