替你查了，Omron HeartGuide，唯一的 FDA-cleared 产品，也是用充气手环测量血压

• Wrist-worn monitors 
• Omron HeartGuide: This is a medical-grade smartwatch that is FDA-cleared for its accuracy. It uses a cuff that inflates on the wrist to take readings, which allows for more precise measurements, according to this Pocketnow article and Kentfaith. It can take readings in about 30 seconds.
• Other models: Some other smartwatches are starting to offer blood pressure monitoring, but accuracy may vary and may not be FDA-cleared.