I have a degree in bioengineering and my school required all students in this major to complete 3 semesters of co-op experience before graduation. My biggest piece of advice would be to search EVERYWHERE for an opportunity. I was lucky that my school provided assistance in finding a co-op however myself and my classmates had the most luck looking on our own. Look through job websites such as indeed and LinkedIn and medical device companies' websites will often post their own job listings.
Join whatever societies are available to you through your school such as SWE (it's not just for women!) and BMES. Then do your best to attend whatever events these societies offer - many companies go to these types of conferences to recruit professionals as well as co-ops/interns.
Best of luck!