Hope that helps.
It is up to this area of knowledge to carry out the design, development, testing, assembly and maintenance of materials and devices that meet the demands of the health system.
In this sense, during development, part of the final process involves testing on patients.
Biomedical engineering encompasses many aspects of health technology for use by care givers and ultimately for patients.
You may choose the path of clinical engineering which will bring you to work within a hospital or clinic; you will be working with health care professionals and not directly with patients nevertheless you will be much more exposed to the patient’s reality as opposed to working in the health technology industry (at least that is my personal experience).
Another thought is that patient centered medicine is at our door and patient involvement in health technology development and clinical trials is more and more a reality; that is another path to be working with patient directly.
Finally, I believe there will be more and more development of different aids for disabled or injured patients such as sophisticated leg/arms prosthesis or even exoskeleton that needs a very close collaboration between industry, researcher and patients themselves.
I think this is great that you are thinking of the patient!
Best of luck