one of said {HEAD ~ jaw members} includes {TAIL ~ a knife blade} extending laterally therefrom toward the other jaw member, said knife blade being exposed when said jaw members are separated to cut the tissue at the intercostal location as said jaws members are inserted in the body wall 
one of said { HEAD ~ jaw members } includes { TAIL ~ a knife blade } extending laterally therefrom toward the other jaw member , said knife blade being exposed when said jaw members are separated to cut the tissue at the intercostal location as said jaws members are inserted in the body wall
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH