4.1 Article

Laser Driven Miniature Diamond Implant for Wireless Retinal Prostheses

期刊

ADVANCED BIOSYSTEMS
卷 4, 期 11, 页码 -

出版社

WILEY-V C H VERLAG GMBH
DOI: 10.1002/adbi.202000055

关键词

electronic; implant; laser; photovoltaic; retina

资金

  1. Australian Research Council [LP160101052]
  2. Natural Sciences and Engineering Research Council of Canada (NSERC) [EGP506146-2016, RGPIN/05783-2014]
  3. Ontario Centers of Excellence
  4. Australian Research Council [LP160101052] Funding Source: Australian Research Council

向作者/读者索取更多资源

The design and benchtop operation of a wireless miniature epiretinal stimulator implant is reported. The implant is optically powered and controlled using safe illumination at near-infrared wavelengths. An application-specific integrated circuit (ASIC) hosting a digital control unit is used to control the implant's electrodes. The ASIC is powered using an advanced photovoltaic (PV) cell and programmed using a single photodiode. Diamond packaging technology is utilized to achieve high-density integration of the implant optoelectronic circuitry, as well as individual connections between a stimulator chip and 256 electrodes, within a 4.6 mm x 3.7 mm x 0.9 mm implant package. An ultrahigh efficiency PV cell with a monochromatic power conversion efficiency of 55% is used to power the implant. On-board photodetection circuity with a bandwidth of 3.7 MHz is used for forward data telemetry of stimulation parameters. In comparison to implants which utilize inductively coupled coils, laser power delivery enables a high degree of miniaturization and lower surgical complexity. The device presented combines the benefits of implant miniaturization and a flexible stimulation strategy provided by a dedicated stimulator chip. This development provides a route to fully wireless miniaturized minimally invasive implants with sophisticated functionalities.

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