If I am eligible for a full refund of taxes paid without using any medical expense claims, is it advisable to submit any of these medical expenses on my tax return?

Medical expenses are a non-refundable tax credit, so including them wouldn't be any benefit. The exception is there are certain cases for low income individuals with enough medical expenses in which case it could become a refundable tax credit.

Also to remember is that medical expenses are more flexible in the period in which they are claimed. You can claim medical expenses for any 12 month period ending in the current tax year. So some of the expenses incurred in 2017 could be instead used on your 2018 year tax return.