YY/T 1680-2020 in English

Analysis of the core content of the standard

This standard specifies a systematic evaluation method for the osteoinductive ability of demineralized bone materials in an ectopic implantation environment, focusing on solving the technical problem of false positives that may occur in traditional in situ implantation. The standard innovatively proposes the use of the athymic nude mouse/rat model combined with the intermuscular implantation scheme to achieve objective evaluation through quantitative histological analysis.

Comparison of key technical requirements

Key points of experimental design

Recommendations for the implementation of the standard

1. Model validation:When the method is first established, a positive/negative control pilot experiment is required to ensure the sensitivity of the system
2. Sample processing:It is recommended to use a neutral excipient (such as saline) to shape the powder material to avoid affecting the osteogenic activity
3. Quality control:Regularly review the staining effect (Goldner trichrome staining is recommended) to prevent false positives of calcium deposition
4. Data recording:The migration of the implant must be recorded in detail, and the experiment should be terminated immediately if peri-bone migration is found

Technology evolution analysis

This standard draws on the core method of ASTM F2529-13 and makes three major improvements to meet China's regulatory needs: 1) clarify the nude mouse age window (6-9 weeks); 2) refine the anatomical positioning of the muscle gap; and 3) establish a 5-level scoring system. It forms a supporting standard system with YY/T0513.3 to solve the performance evaluation and quality control problems of demineralized bone materials.