Siemens is a big company, but medical students may enter the company to do sales, such as holding various receptions, explaining and demonstrating the machine to doctors. It is also possible to be an engineer in charge of repairing the machine (but this kind of high demand for talent specialization, usually choose the electronic and electrical engineering class).
You can think about what you want to do at Siemens. Then look at the last few years of recruitment of talent specialization in the situation, in deciding whether to go to graduate school, what to study