Proceedings ArticleDOI
Virtual Instrument for the Measurement of Haemo-dynamic Parameters Using Photoplethysmograph
K. Ashoka Reddy,J. Rezuana Bai,Boby George,N. Madhu Mohan,V. Jagadeesh Kumar +4 more
- pp 1167-1171
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TLDR
The design and development of a virtual instrument for the measurement of haemodynamic parameters namely, pulse rate and oxygen saturation in arterial blood based on the popular photoplethysmographic (PPG) principle is presented.Abstract:
This paper presents the design and development of a virtual instrument for the measurement of haemo-dynamic parameters namely, pulse rate and oxygen saturation in arterial blood based on the popular photoplethysmographic (PPG) principle. A clip-on sensor, housing red and infrared (IR) light emitting diodes and suitable photo detectors is developed. The sensor is interfaced to a PC utilizing the audio channel of the sound card, thus dispensing with expensive analog to digital converter hardware. Since the frequency response of the audio channel is not suitable for the PPG waveforms of red and IR, FM modulation and demodulation are employed. An empirical relationship is developed for the computation of the oxygen saturation in arterial blood using the red and IR PPG data and the well-known and well-established extinction coefficients of haemoglobin with and without oxygen. Data acquisition and processing are accomplished under LabVIEW virtual environment.read more
Citations
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Journal ArticleDOI
Use of Fourier Series Analysis for Motion Artifact Reduction and Data Compression of Photoplethysmographic Signals
TL;DR: Experimental results indicate that the proposed method is insensitive to heart rate variation, introduces negligible error in the processed PPG signals due to the additional processing, preserves all the morphological features of the PPG, provides 35 dB reduction in motion artifacts, and achieves a data compression factor of 12.
Proceedings ArticleDOI
Motion Artifact Reduction in Photoplethysmographic Signals using Singular Value Decomposition
K.A. Reddy,V.J. Kumar +1 more
TL;DR: In this article, a singular value decomposition (SVD) based method is proposed to reduce motion artifacts from corrupted PPG signals, which is shown to achieve stable and reliable SpO2 measurement even when PPGs are distorted by motion artifacts.
Journal ArticleDOI
Multi-sensor system with Bluetooth connectivity for non-invasive measurements of human body physical parameters
TL;DR: A simple, portable and low-cost system for non-invasive and real-time measurement of physical parameters is proposed and experimentally characterized and the experimental characterization of the prototype has demonstrated the validity of this approach.
Proceedings ArticleDOI
Respiratory rate, heart rate and continuous measurement of BP using PPG
TL;DR: The developed PPG based method can be used as a noninvasive alternative to the conventional occluding-cuff approaches for long-term and continuous monitoring of blood pressure, heart rate and respiratory rate.
Patent
Systems and methods for determining physiological characteristics of a patient using pulse oximetry
TL;DR: In this paper, an electronic device can operate an external sensor comprising one or more emitters for emitting electromagnetic radiation of two different wavelengths and a detector for generating a response signal based on received electromagnetic radiation.
References
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TL;DR: The principles of pulse oximetry are reviewed, with an eye toward recognizing the limitations of this tool, which include performance limitations in the settings of carboxyhemoglobinemia, methemoglobeinema, motion artifact, hypotension, vasoconstriction, and anemia.
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Noninvasive pulse oximetry utilizing skin reflectance photoplethysmography
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TL;DR: The results from a series of in vivo studies to evaluate a prototype skin-reflectance pulse oximeter in humans are presented, showing locally heating the skin is shown to increase the pulsatile component of the reflected photoplethysmograms.
Proceedings ArticleDOI
Artifact-resistant, power-efficient design of finger-ring plethysmographic sensors. I. Design and analysis
TL;DR: A miniaturized, telemetric, photoplethysmograph sensor for long-term, continuous monitoring is presented, and an efficient double ring design is developed to lower the influence of external force, acceleration, and ambient light.
Journal ArticleDOI
Extinction coefficients of hemoglobin for near-infrared spectroscopy of tissue
TL;DR: In this paper, the extinction coefficients of hemoglobin have been studied for five decades by clinical chemists and biochemists, particularly for laboratory spectrophotometric measurements, in order to achieve mathematical conversion from the detected light intensity at different wavelengths to hemoglobin concentration, /spl epsiv/ must be used.