Personally I'd advise on brushing up on the practical skills (soldering, desoldering, wiring). Here they've taken on people from other industries so a lack of servicing medical equipment wouldn't be a problem. (unless you end up short listed with people with medical equipment experience) Anybody that comes to our trust gets a practical and it's usually the area that most people fall down on.
Next electronics knowledge, if you get to the interview stage the most common test is the describe the circuit diagram and identify components. Another one that people fall down on. If anything look at the articles section on this forum.
Did you do a practical project on your degree that might make a better addendum on the CV than buying junk and describing how you fixed it? Haven't heard it work in this sector but any relevant hobbies?