I've done something similar....
When I was just out of high school I took a job as a chef.... one of the restaurants I worked at had knives held onto magnetic strips on the wall. I went to grab one once and an extra one came down and smacked my middle knuckle. It was so sharp that my knuckle burst open and blood went everywhere. All I wanted to do was hold a rag on it until the bleeding stopped but one of the waitresses took a look and decided when she could see the bones fairly clearly that I should go to the ER. Good thing I did, the knife had cut clean through the tendon that moves my middle finger. If they hadn't sown it up right then and there I would have lost the use of that finger entirely.
Anyway, I wouldn't have gone to the ER in this case either.... ER's take the man card away and rarely give them back.