ISO 9001 and ISO 13485 high-level structure are different but there is a good overlap on individual clauses.
The mandatory compliance requirements around the Documented Information, Internal Audit, Nonconformance, Corrective Actions, Management Review, Risk Management are the same for both standards.
ISO 13485 focuses on the specific Medical Device product/service which is identified per the scope. Additionally, Regulatory requirements, health and safety, device master records, and device history files need to be defined and addressed.
So short answer is, if you have a strong ISO 9001 framework, you are halfway there in meeting the ISO 13485 requirements.
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