A french physician named Rene Laennec invented the stethoscope. The stethoscope is a medical instrument used to determined blood pressure, and is still used today! When it was first introduced, it was made out of wooden tubes.
A dentist named William Morton publishes a book about the process of using anesthesia. The proper use of anesthesia is important because there has been people that wake up during surgery. Anesthesia is still used today, it is just modified since we're living in the 21st century.
In the year of 1895, Wilhelm Conrad found the X-Ray. Like many other discoveries, this is still used today! The x-ray allows views from inside the body, mostly used to diagnose or surgical procedures.