Tools Of The Trade?

A doctor came into a hospital room and told the patient's husband to wait 
outside while he examined his wife.  A few minutes later the doctor came 
out and asked a nurse's aide if she could get him a pair of pliers.  She 
did, and he went back into the patient's room.  Five minutes later he came 
back out and asked for a screwdriver.  When he came out a third time and 
asked for a hammer, the anxious husband demanded to know what was wrong 
with his wife.  

"I don't know yet," the doctor said.  "I can't get my bag open."