基于虚拟仪器的心功能检测系统的设计

The Design of Heart Function Detection System Based on the Virtual Instrument

设计了一种基于虚拟仪器的具有心电采集和踏车控制功能的心功能检测系统。系统采用自行设计的数据采集卡来实现心电数据的安全测量和输出控制指令。数据采集卡由心电信号放大电路、信号采集电路、踏车控制电路组成,通过USB接口与PC机相连。系统软件采用LabVIEW编程语言,可实现数据库管理、心电波形显示、心电特征点分析、实时心率显示、ST段识别、踏车控制、数据即时存储、波形回放以及打印诊断结果等功能。

A heart function detection system based on the virtual instrument is described, which can implement some functions such as the acquisition of electrocardiogram （ECG） signals and the control of an experimental cycle. A home-made data-acquisition card is used to safely obtain ECG signals and export controlling commands. This data-acquisition card is composed of ECG signal amplificatory circuits, signal acquisition circuits, and cycle controlled circuits. It communicates with a personal computer by USB interface. The acquired ECG data transferred from this card is dealt with and displayed in LabVIEW environment. It is also used to manage database, save ECG wave graphs, export signals for the control of cycles and print the diagnostic results.