Detection of ECG signals on personal mobile phones

Detection of ECG signals on personal mobile phones

ABSTRACT: Life-threatening cardiovascular diseases require early de-tection or diagnosis. A standard procedure, long-term ECG monitoring of cardiac patients is currently the best way to reduce the number of heart failures. Dry and washable tex-tile electrodes embedded in comfortable garment or in a wearable chest belt have been proven very effective for a long-term ECG monitoring in comparison to the conven-tional Ag/AgCl electrodes. Hereby, we present a wearable ECG chest belt, which contains stitched textile electrodes for ECG detection and analog preprocessing circuits em-bedded in tiny cell-phone plugs. With them we achieve on-site ECG processing, display and transmission using a dual-core OMAP3-based embedded system. Our experiments have shown promising results of textile electrodes along with our hardware and embedded system in conveying a better ECG signal quality having a clinical significance and hence enabled long-term ECG recording in a daily life.

MATERIALS & METHODS: Active Belt & Textile ElectrodesA stretchable and breathable chest belt (34.5cm x 84.5cm) was fabricated from neoprene material (SEDO Chemicals Neoprene GmbH, Germany) with velcro on the closing ends. Three Textile electrodes, two of them elliptical (⋯6.5cm and ⋮3.5cm) for ECG were stitched on two sides of the torso on the belt and a circular electrode for ground (Ø2.5cm) next to the navel. The washable textile electrodes (TITV Greiz, Germany) are made of polyamide threads (ELITEXR) coated with pure silver with a thickness of 1-2μm and a resistivity of 20Ω/m. Each thread can be stretched up to 7% of the original length without compromising the conductivity.

ECG Analog Circuits in Cell-phone Plugs: The raw ECG signal detected by the textile electrodes on the body is fed to the amplifier plug, which contains the biopotential amplifier array RHA1016 (Intan Technolo-gies… ) with few additional components. The low-power RHA1016 contains 16 differential amplifiers (gain = 200), tus in principle suited for multichannel ECG.Two ex-ternal resistors R1 and R2 are board-mounted to set the cut-off frequency of 100Hz for a built-in programmable 3rd order butterworth low pass filter.The amplifier’s output connects to the ADC plug, which contains a single channel ADC (ADS1271, Texas Instru-ments Inc., USA) with a data rate up to 105kSps following an instrumentation amplifier (IA) with a gain of 20.

Dual-core OMAP3-based Embedded System: OMAP3530 (OMAP3) (Texas Instruments Inc., USA) found in new generation smart-phones is a dual-core (ARM+DSP) application processor, which is an ARM-based SoC with laptop-like performance. The OMAP3 has the following prominent features [10] • 720 MHz ARM Cortex-A8 core provides 1400 Dhrys-tone million instructions per second (MIPS) and runs fully-featured operating systems e.g., embedded Linux, Android, WindowsCE. • 520 MHz C64x+™ DSP furnishes excellent signal processing and computing. • Display subsystem provides the advanced display. • Comprehensive power and clock-management scheme enable high-performance and low-power.

CONCLUSIONS: We have presented a successful implementation of a weara-ble single channel ECG Active Belt for a long-term ECG recording with the potential of up to 16 channels. Initially, the textile electrode was compared with the conventional electrode in terms of their ability to perform long-term re-cording. The textile electrode has shown a promising out-come by exhibiting low skin-electrode impedance and a high SNR for long-term recording. We have mounted ana-log processing hardware in tiny cell-phone connectors, which are detachable and mounted in the vicinity to the ECG detection site. We have achieved ECG processing, and display on the Active belt utilizing the computing power of the dual-core processor OMAP3. The ECG data transmis-sion from the Active Belt to a remote computer visa WLAN is currently under development. Thus, the Active Belt brings a long-term ECG recording in patient’s daily life and helps in the future by on-site analysis and/or remote experts to diagnose cardiovascular problems earlier.

REFERENCES: 1. A. Gruetzmann, S. Hansen, and J. Mueller, “Novel dry elec-trodes for ECG monitoring.,” Physiological measurement, vol. 28, 2007, pp. 1375-90. 2. N. Taccini, G. Loriga, A. Dittmar, and R. Paradiso, “Knitted Bioclothes for Health Monitoring,” in Proceedings of the 26th Annual International Conference of the IEEE EMBS, San Francisco, CA, 2004, pp. 2165-2168.

Sravani Mazumdar, working as Assistant Professor in Rajahmahendri Institute of engineering and Technology,Rajahmundry,AP.

 


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