How many robots work in hospitals?

My name is Purplemouse and I live in Virginia. I am a nurse and I have seen before robots in the hospital setting. In fact, I have seen the latest surgical robots that came to the hospital. In fact, when I did research about robots in the workplace, there were 90,000 robots and I bet today in 2016 there are 180,000 robots that are working and helping other human workers. My question would be: What robot company makes these types of robots that work in hospitals?