Huawei Blood Pressure Monitoring Device Patent Decryption
Recently, Huawei was officially approved to start producing medical devices, and Huawei’s wrist single-lead ECG collector was officially approved for production. Huawei consumer business cell phone product line president He Gang microblogging article pointed out that Huawei’s first smartwatch can measure blood pressure has passed the medical device registration test.
The electronic wrist blood pressure monitor measures the blood pressure in the wrist through the air pressure sensor connected to the airbag to measure the air pressure signal inside the airbag.
In the case of the same wrist circumference, if the subject’s wrist fat thickness is thicker and the radial artery is hidden deeper, as the fatty tissue has a certain elasticity and acts as a buffer, it will lead to the air pressure inside the airbag being greater than the real pressure at the radial artery, and the pulse wave signal will shift to the right, resulting in the measured blood pressure being higher than the real systolic pressure.
In this regard, Huawei applied for a patent (Application No. 202020567693.3) on April 16, 2020, for an invention called “blood pressure detection device” by Huawei Technologies Co. discovered by ItHome.
The above figure shows the schematic diagram of a module of the blood pressure detection device proposed in the present invention, which includes a wrist circumference detection component 03, a wrist fat thickness detection component 01, a blood pressure detection component 02, and a processor 04, and the processor is connected to the other three components respectively.
The wrist circumference detection component obtains the user’s wrist circumference data, the wrist fat thickness detection component obtains the user’s wrist fat thickness data, the blood pressure detection component obtains the user’s blood pressure data, and finally, the processor corrects the blood pressure data based on the wrist circumference data and the wrist fat thickness data.
The processor determines whether the blood pressure data needs to be corrected based on the wrist circumference data and the wrist fat thickness data, and when the blood pressure data needs to be corrected, it obtains the mapping relationship corresponding to the wrist circumference data and the wrist fat thickness data from the predetermined database, to correct the blood pressure data.
In particular, the blood pressure detection device includes a body part, and a strap connected to the body part, and the strap wears the body part on the wrist of the user, and the body part includes a processor.
The wrist circumference detection assembly includes an adjustable component and an electrical parameter detection circuit, and the two components are connected. The electrical parameter detection circuit is located inside the main part and is capable of detecting the electrical parameters of the adjustable component, and obtaining the wrist circumference data corresponding to the detected electrical parameters according to the pre-established correspondence between the electrical parameters and the wrist circumference data.
The wrist fat thickness detection assembly includes an excitation electrode, a detection electrode, and an impedance detection circuit. The excitation electrode is located on the side of the main part and is capable of forwarding the excitation voltage. The detection electrode is located at the bottom of the main part and is used to receive the detection voltage, which is generated by the excitation voltage according to the pressure drop of the user’s wrist fat. The impedance detection circuit is located inside the main part and is capable of generating the excitation voltage and calculating the wrist fat thickness data based on the excitation voltage and the detection voltage.
In short, Huawei‘s blood pressure monitoring device patent improves the accuracy of blood pressure measurement and the compatibility of blood pressure measurement devices by obtaining the user’s wrist circumference data and wrist fat thickness data, enhancing the user’s wearing experience.