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Transcutaneous optical telemetry system with infrared laser diode

K Inoue1, K Shiba, E Shu

  • 1Department of Electrical Engineering, Faculty of Science and Technology, Science University of Tokyo, Japan.

ASAIO Journal (American Society for Artificial Internal Organs : 1992)
|November 27, 1998
PubMed
Summary

This study demonstrates a transcutaneous optical telemetry system for artificial hearts. Infrared light successfully transmitted data through 4mm goat skin, showing error-free performance for critical medical monitoring.

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Area of Science:

  • Biomedical Engineering
  • Optical Communications
  • Implantable Devices

Background:

  • Transcutaneous telemetry is crucial for monitoring implanted artificial hearts.
  • Optical telemetry offers advantages over radio frequency (RF) systems, including reduced electromagnetic interference and lower power consumption.

Purpose of the Study:

  • To evaluate a transcutaneous optical coupler for artificial heart monitoring.
  • To assess the optical coupling and information transmission capabilities of the system in vitro.

Main Methods:

  • An infrared laser diode (LD) and PIN photodiode (PINPD) based optical coupler was tested.
  • Experiments involved transmitting phase shift keying (PSK) modulated signals at 9,600 bps through 4mm thick goat skin.
  • Demodulation was performed using a phase-locked loop (PLL).

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Main Results:

  • The system demonstrated successful data transmission through 4mm goat skin.
  • Error-free demodulation was achieved within a 10.5mm deviation at a 11mm distance.
  • PINPD directional angle influenced permissible optical axis deviation, with larger angles allowing more deviation.

Conclusions:

  • The evaluated transcutaneous optical telemetry system using an infrared LD is suitable for monitoring and controlling implanted artificial hearts.
  • The system exhibits sufficient performance characteristics for reliable biomedical telemetry applications.