The concept of a specific deadline for NMPA certification of medical devices in China can vary depending on several factors, including changes in regulations and the specific type of medical device. However, there are some general considerations:

1. Transition Periods: When new regulations or updates are implemented by the NMPA, there may be transition periods during which existing devices may continue to be marketed while transitioning to comply with new requirements.

2. Implementation of New Regulations: For devices requiring re-certification or compliance with new regulations, there might be deadlines set by the NMPA for manufacturers to update their certifications.

3. Specific Device Categories: Some categories of medical devices might have specific deadlines or timelines for compliance based on their risk classification or regulatory changes affecting their approval status.

To ensure compliance and to understand any applicable deadlines for your specific medical device, it's essential to regularly monitor updates from the NMPA or consult with a regulatory affairs specialist familiar with Chinese regulations. They can provide guidance tailored to your device's regulatory requirements and help you navigate the certification process effectively.