2. 自查准备：对企业内部的质量管理体系进行自查，确保符合医疗器械相关的质量管理要求，如生产工艺、生产设备、人员素质、质量控制、设备检测等。

3. 咨询指导：可以在中国国家药品监督管理局（CFDA）的guanfangwangzhan上查询相关政策和流程，也可以联系北京市食品药品监督管理局或相关部门了解详细的申请要求和指导。

4. 申请递交：将准备好的申请材料递交给北京市食品药品监督管理局或相应的区县级药监部门。

5. 审核及评审：申请材料递交后，相关部门会进行审核和评审，包括对质量管理体系的合规性、产品技术的合规性、生产场所的合规性等方面的审查。

6. 报告批准：如果申请符合相关要求，审核通过后，相关部门会向申请人颁发三类医疗器械许可证。

How long does it take to approve the registration of the class III medical device license? (1) Acceptance: The applicant shall apply to the Administrative Acceptance Service Center, submit the application materials in accordance with the catalogue listed in Article 6 of the Instructions, and the staff of the Acceptance Center shall examine the application materials in accordance with the requirements of the Acceptance Standards for the Registration and Application Materials of Domestic Third Class and Overseas Medical Devices (National Drug Administration [2005] No.111). Where the application item does not need to obtain an administrative license according to law, The applicant shall be informed immediately of the non-acceptance of the application; Where the application items do not fall within the scope of the functions and powers of the administrative organ according to law, A decision shall be made immediately, And inform the applicant to apply to the relevant administrative organ;