Microsurgical laser Doppler probe for simultaneous intraoperative monitoring of cochlear blood flow and electrocochleography from the round window

Lidet Abiy, Fred Telischi, Jean Marie Parel, Fabrice Manns, Ralph Saettele, Krysztoff Morawski, Ozcan Ozdamar, John Borgos, Rafael Delgado, Edward Miskiel, Erdem Yavuz

Research output: Contribution to journalConference article


The aim of this project is the development of a microsurgical laser Doppler (LD) probe that simultaneously monitors blood flow and Electrocochleography (ECochG) from the round window of the ear. The device will prevent neurosensory hearing loss during acoustic neuroma surgery by preventing damage to the internal auditory nerve and to the cochlear blood flow supply. A commercially available 0.5 mm diameter Laser-Doppler velocimetry probe (LaserFlo, Vasamedics) was modified to integrate an ECochG electrode. A tube for suction and irrigation was incorporated into a sheath of the probe shaft, to facilitate cleaning of the round window (RW) and allow drug delivery to the round window membrane. The prototype microprobe was calibrated on a single vessel model and tested in vivo in a rabbit model. Preliminary results indicate that the microprobe was able to measure changes in cochlear blood flow (CBF) and ECochG potentials from the round window of rabbits in vivo, the microprobe is suitable for monitoring cochlear blood flow and auditory cochlear potentials during human surgery.

Original languageEnglish (US)
Pages (from-to)272-277
Number of pages6
JournalProceedings of SPIE - The International Society for Optical Engineering
StatePublished - Sep 29 2003
EventLasers in Surgery: Advanced Characterization, Therapeutics, and Systems XIII - San Jose,CA, United States
Duration: Jan 25 2003Jan 26 2003



  • Blood flow
  • Electrocochleography
  • Laser Doppler
  • Round window

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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