Abstract
We present here the improved design and development of optical sensor for non-invasive measurements of arterial blood flow waveform. The sensor is based on a physical principle of reflective photoplethysmography (PPG). As the light source we used serially connected infrared diodes whereas NPN silicon phototransistors were used as light detectors. The electronic components were molded into square package and poured with silicone. Such preparation produced an elastic superficies that allowed excellent attachment of the sensor on the skin’s surface. Moreover, a serial connection of infrared diodes and phototransistors completely eliminated signal artifacts caused by minor muscle contractions. The sensor recording performances were examined at the photoplethysmographic sites on three different arteries; the commune carotid, femoral and radial and, on each site the sensor demonstrated remarkable capability to make a consistent, reproducible measurements. Because of the advantageous physical and electrical properties, the new sensor is suitable for various cardiovascular diagnostics procedures, especially when long-term measurements of arterial blood flow waveform are required, for monitoring of different parameters in cardiovascular units and for research.
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This work was supported by Serbian Ministry of Education and Science Projects 32040 and 41022.
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Djurić, B., Suzić, S., Stojadinović, B. et al. An improved design of optical sensor for long-term measurement of arterial blood flow waveform. Biomed Microdevices 19, 48 (2017). https://doi.org/10.1007/s10544-017-0196-x
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DOI: https://doi.org/10.1007/s10544-017-0196-x