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