One is China International Medical Device Expo (CMEF), which is held twice a year, usually in April and 10. The last two sessions were held in Shenzhen and Chengdu respectively.
The other is the International Medical Instrument and Equipment Exhibition (MED), which is held once a year, usually in Beijing every March.
You can go to MED (25th International Medical Instrument and Equipment Exhibition) in March.
The time is March 28 -30 at the Beijing National Convention Center.