I'm not in medical devices, but I can tell you the first question is - A deviation from what? A print? A processing deviation? An ISO 13485 requirement?
From Mfg instructions mainly.
But more of a general question.
We (Quality Group) have had a discussion that in Medical Device NO deviation is acceptable. But I can't find any yes/no in any of the regulations.
Formally, the acceptance of deviation is more related to the finished product. For example, ISO 13485 allows that a non-conforming final product be liberated under concession if the non-conformity does not affect compliance with regulatory requirements (mainly related to product safety and performance).
You can release it under concession, however, you cannot do it forever. If for whatever reason that is one-off occurrence you can use a concession, otherwise you need to initiate a change control and update your process.