医疗器械板块12月23日跌0.89%，奥精医疗领跌，主力资金净流出6.28亿元

Group 1 - The medical device sector experienced a decline of 0.89% compared to the previous trading day, with AoJing Medical leading the drop [1] - On the same day, the Shanghai Composite Index closed at 3919.98, up 0.07%, while the Shenzhen Component Index closed at 13368.99, up 0.27% [1] - A detailed table of individual stock performance within the medical device sector is provided [1] Group 2 - The net outflow of main funds in the medical device sector was 628 million yuan, while retail funds saw a net inflow of 439 million yuan [2] - The net inflow of speculative funds amounted to 189 million yuan [2] - A detailed table of fund flows for individual stocks in the medical device sector is included [2]