A novel signal acquisition platform of human cardiovascular information with noninvasive method

Abstract

Cardiovascular diseases (CVDs) are considered the major cause of death worldwide, so more researchers pay more and more attention to the development of a non-invasive method to obtain as much cardiovascular information (CVI) as possible for early screening and diagnosing. It is known that considerable brain information could be probed by a variety of stimuli (such as video, light, and sound). Therefore, it is quite possible that much more CVI could be extracted via giving the human body some special interrelated stimulus. Based on this hypothesis, we designed a novel signal platform to acquire more CVI with a special stimulus, which is to give a gradual decrease and a different settable constant pressure to six air belts placed on two-side brachia, wrists, and ankles, respectively. During the stimulating process, the platform is able to collect 24-channel dynamic signals related with CVI synchronously. Moreover, to improve the measurement accuracy of signal acquisition, a high precision reference chip and a software correction are adopted in this platform. Additionally, we have also shown some collection instances and analysis results in this paper for its reliability. The results suggest that our platform can not only be applied on study in a deep-going way of relationship between collected signals and CVDs but can also serve as the basic tool for developing a new noninvasive cardiovascular function detection instrument and system that can be used both at home and in the hospital.

A portable analyzer based on a novel optical structure for urine dry-chemistry analysis

“…Among them, the microcontroller unit plays a major role in all kinds of signal measurements and controls. It is manly composed of a 32-bit microcontroller STM32F103VE [22,23], which incorporates the high-performance ARM ® Cortex™-M3 32-bit RISC core operating at a 72 MHz frequency, high-speed embedded 512 Kbytes flash memories and 64 Kbytes SRAM, and offers three 12bit ADCs, two 12-bit DACs, four general-purpose 16-bit timers plus two pulse width module (PWM) timers, five USARTs. About 200 Kbytes flash memories are used to store the program and important data, such as various calibration coefficients, semi-quantitative intervals (SQIs), and so on.…”