School of Information and Communication Engineering, University of Electronic Science and Technology of China, Chengdu, Sichuan 611731, China.
School of Electronic Engineering, University of Electronic Science and Technology of China, Chengdu, Sichuan 611731, China.
J Healthc Eng. 2018 Oct 3;2018:3916481. doi: 10.1155/2018/3916481. eCollection 2018.
Aiming to measure the blood flow velocity in a finger, a novel noninvasive method, i.e., a ring with a heat source chip and a temperature sensor, is designed in this paper. The heat source chip is used to heat the finger and generate heat diffusion between the chip and the temperature sensor. And the temperature sensor is designed to measure the temperature difference. Since the blood flow is the main medium of heat diffusion in bodies, part from the heat energy in the tissue will be taken away by the flowing blood. Therefore, the blood flow velocity can be acquired via its relationship with the temperature difference. Compared to the ultrasound Doppler method and the laser Doppler method, the proposed method guarantees a more convenient operation in more flexible work sites. We also analyze the theory between heat transfer and laminar flow. Finally, several simulations are conducted, and the influence of the relevant factors (i.e., the number of blood vessels, the radius, etc.) corresponding to the simulation results is also discussed.
本文设计了一种新型的无创测量手指血流速度的方法，即带有热源芯片和温度传感器的指环。热源芯片用于加热手指，在芯片和温度传感器之间产生热扩散，而温度传感器则用于测量温差。由于血流是人体中热扩散的主要介质，部分组织中的热能将被流动的血液带走。因此，可以通过血流速度与温差之间的关系来获得血流速度。与超声多普勒法和激光多普勒法相比，该方法在更灵活的工作场所保证了更方便的操作。我们还分析了传热和层流之间的理论关系。最后，进行了多次模拟，并讨论了模拟结果对应的相关因素（如血管数量、半径等）的影响。
