Design Of A Hemodynamic Monitoring System Based On Cortex-M3

Cardiac Output (CO), an important hemodynamic parameter is applied with great significance during clinical surgical procedure. Thermo dilution method using a Swan-Ganz catheter is the most common CO monitoring technique at present, but the high risk of heart catheterization limited its application. Continuous CO monitoring devices using a less risky method are not yet available in China. Therefore, development of hemodynamic monitoring device with continuous CO monitoring is the focus of this domain.Paper presented a new CO monitoring design device based on ECG, PPG, invasive blood pressure and other peripheral arterial parameters. In the analysis of signal acquisition needs, paper designed an ECG, PPG, IBP synchronous sampling system. The device was built based on a32-bit Cortex-M3processor, along with a power system design meeting medical instrument requirements, communication protocols and real-time calculate-display system.Paper designed test experiments for prototype of the device, which includes power consumption test and run-time test. Result showed that prototype works with a low current of less than95mA, working power less than500mW. Prototype worked continuously for more than168hours, which meets the design targets. Prototype was used for a clinical signal acquisition test, which accomplished7cases of surgical procedure under a harsh environment. Prototype worked with stability under electrosurgical interference. Good correlation between the results of seven cases monitoring data with the Vigileo/Flotrac monitoring data proved the accuracy of the system.