Class B medical devices in the EU refer to those that are considered medium risk, such as certain diagnostic devices and some non-invasive equipment. To apply for CE certification for a Class B device, you need to follow these steps:

1. Prepare Technical Documentation: This includes detailed product specifications, risk analysis, and clinical evaluations.
2. Quality Management System (QMS): Implement and document a QMS compliant with ISO 13485.
3. Choose a Notified Body: For Class B devices, you need to involve a Notified Body to assess your technical documentation and QMS.
4. Submit Application: Provide your technical documentation and other required information to the Notified Body.
5. Certification Process: The Notified Body will review your application and conduct audits. If everything is in order, they will issue a CE certificate.
6. Post-Market Surveillance: After certification, maintain records and conduct post-market surveillance as required.