Design and evaluation of a low-cost smartphone pulse oximeter

Area of Science:

• Biomedical Engineering
• Global Health Technology
• Medical Diagnostics

Background:

• Pneumonia and other infectious diseases cause millions of child deaths annually in low- and middle-income countries.
• Lack of accessible, low-cost diagnostic tools hinders timely intervention and treatment.
• Pulse oximetry is a non-invasive method to assess disease severity, particularly in pneumonia.

Purpose of the Study:

• To develop and validate a low-cost pulse oximeter integrated with widely available smartphones.
• To create a systematic verification system for automated validation of the smartphone-based oximeter.
• To explore the potential of mobile health technology in addressing global health challenges.

Main Methods:

• Implementation of a pulse oximeter interfaced with a smartphone via the audio jack.
• Utilization of a conventional clinical oximeter finger sensor.
• Development of a simulator-based system for automated validation across various smartphone models.

Main Results:

• The smartphone-based audio oximeter demonstrated excellent agreement with simulated data for oxygen saturation and heart rate.
• Validation was performed across a range of optical transmission levels.
• Successful testing was conducted on 4th and 5th generation iPod Touch and iPhone devices.

Conclusions:

• Smartphone integration offers a viable, low-cost solution for pulse oximetry in resource-limited settings.
• This technology has the potential to significantly improve diagnostics for infectious diseases, saving lives.
• Automated validation systems are crucial for ensuring the reliability of mobile health diagnostic tools.