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SpO2 sensor embedded in a finger ring: design and implementation.

J Solà1, S Castoldi, O Chételat

  • 1Swiss Center for Electron. & Microtechnol., Neuchâtel, Switzerland. jsa@csem.ch

Conference Proceedings : ... Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual Conference
|October 20, 2007
PubMed
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A new finger ring sensor accurately measures blood oxygen saturation (SpO2). This wearable device compensates for anatomical variations and ambient light for reliable pulse oximetry readings.

Area of Science:

  • Biomedical Engineering
  • Medical Devices
  • Wearable Technology

Background:

  • Accurate blood oxygen saturation (SpO2) monitoring is crucial for patient care.
  • Existing pulse oximetry methods can be affected by ambient light and anatomical variations.
  • The development of non-invasive, wearable SpO2 sensors is an active area of research.

Purpose of the Study:

  • To introduce a novel SpO2 sensor integrated into a finger ring design.
  • To address challenges in SpO2 measurement accuracy caused by finger topology and low perfusion.
  • To validate the performance of the new ring-based SpO2 sensor through in-vivo testing.

Main Methods:

  • A unique mechanical design ensures a consistent fit and force on the phalanx for all users.
  • Analog electronics are employed to reject ambient light interference.

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  • An innovative arrangement of light sources and detectors, coupled with specialized signal processing, overcomes anatomical heterogeneity and compensates for low perfusion.

    • Main Results:

    • The developed finger ring sensor demonstrates the ability to estimate equivalent pulse oximetry SpO2 indexes.
    • Initial in-vivo validation results indicate promising performance of the novel sensor.
    • The system effectively resolves anatomical variations and compensates for perfusion index limitations.

    Conclusions:

    • The novel finger ring SpO2 sensor offers a promising solution for accurate, non-invasive blood oxygen monitoring.
    • The device's design and signal processing overcome key limitations of traditional pulse oximetry.
    • Further in-vivo validation is discussed, paving the way for potential clinical applications.