Pulse frequency modulation based CMOS image sensor for subretinal stimulation

  • Ng D
  • Furumiya T
  • Yasuoka K
 et al. 
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Abstract

We have developed a CMOS image sensor based on pulse frequency modulation for subretinal implantation. The sensor chip forms part of the proposed intraocular retinal prosthesis system where data and power transmission are provided wirelessly from an extraocular unit. Image sensing and electrical stimulus are integrated onto the same chip. Image of sufficient resolution has been demonstrated using 16times16 pixels. Biphasic current stimulus pulses at above threshold levels of the human retina (500 muA) at varying frame rates (4 Hz to 8 kHz) have been achieved. The implant chip was fabricated using standard CMOS technology

Author-supplied keywords

  • 4 to 8000 Hz
  • 500 muA
  • CMOS image sensor
  • CMOS image sensors
  • CMOS technology
  • Frequency modulation
  • Image resolution
  • Pixel
  • Pulse modulation
  • Retina
  • Sensor systems
  • biphasic current stimulus pulses
  • data transmission
  • electrical stimulus
  • extraocular unit
  • eye
  • human retina
  • image sensing
  • intraocular retinal prosthesis system
  • neuromuscular stimulation
  • power transmission
  • prosthetics
  • pulse frequency modulation
  • pulse-frequency modulation (PFM)
  • retinal prosthesis
  • subretinal implant
  • subretinal stimulation

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Authors

  • D C Ng

  • T Furumiya

  • K Yasuoka

  • A Uehara

  • K Kagawa

  • T Tokuda

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