Hi, Welcome to Health care magic forum.
                      Due to scratches in the 
esophagus with the stapler He may feel the irritation for few days. But must be treated to prevent the infection. 
                      I usually prescribe to my patient with such history to eat plenty of banana,to prevent 
injury to the stomach, and make a soft stool, to expel it.To make sure he must watch the stools, to find it in the stools.  
                       I advise you to consult a gastro enenterologist  to have a look at the esophagus, and stomach.  
                      Take more of green leafy vegetables, pulses, sprouts,and 
protein rich foods to hasten the repair. 
                      Wishing for a quick and complete recovery. Thank you.