A Design Of Portable Arterioslerosis Detector

Various diseases,in which cardiovascular disease has become the first killer of human health,are increasing since the rest and dietary laws are changed deeply while the life rhythm are hurried up.The study found that arterial elasticity transform and cardiovascular disease have a strong correlation,the incidence and nortality can be reduced if arteriosclerosis condition is diagnosed early.The occasion of use of the traditional early testing equipment is limited due to large volume and high price,which is not cost-effective to meet social needs.For this,a small and low-cost portable arteriosclerosis detector is designed by this subject with the smart mobile terminal and low-power Bluetooth features.The pulse wave signals of human limbs are collected by this detector,the piconet is formed by Bluetooth 4.0,and the limbs pulse data are transmitted to Android client,the condition of medium-sized arteries is comprehensive assessed by brachial ankle pulse wave velocity and ankle brachial index.The hardware design of the pulse signal acquisition module,including sensor,pre-processing circuit,charge management,RF transceiver circuit,drive circuit and controller chip,etc,is elaborated by this paper,whose selection principle and design implementation are specific instructed.The theory of Bluetooth 4.0 low energy is described in detail,the BLE protocol stack hierarchy and the mechanism and application of GAP and GATT layer are analyzed,and detailed description based on TI BLE protocol stack to achieve the process of pulse signal acquisition procedures is illustrated.Android client software development is completed,which mainly consists of BLE network,pulse waveform display,software filtering,characteristics acquisition of pulse waves and the methods how to design are given amply.Finally,a comprehensive evaluation of this equipment is accomplished from latency,bit error rate,compatibility,stability and accuracy,and the test results are good.This device is simple and extensible,it will have more realistic significance for the prevention of cardiovascular disease if improved and perfected better.