Middle Ear Implants: Concepts and Implementations. Jonathan H. Spindel, Ph.D. College of Integrated Science and Technology James Madison University, Harrisonburg, Virginia http://sharepoint.cisat.jmu.edu/isat/spindejh/presentations e-mail: email@example.com. What is an MEIHD?.
Jonathan H. Spindel, Ph.D.
College of Integrated Science and Technology
James Madison University, Harrisonburg, Virginia
A hearing amplification device in which vibrational energy is delivered to the ear using implanted components.
Different from a cochlear implant:
Different from bone vibrators (i.e. BAHA):
Tortuous and small ear canals
Chronic EAC issues
Irritation, swelling & pain, infection, contact dermatitis
Chronic cerumen production
Environmental factors that prevent HA use
Unresolved issues in conductive hearing loss
Ball et al.
Dumon et al.
Fredrickson et al.
Goode et al.
Hough et al.
Hüttenbrink et al.
Kartush and Tos
Maniglia et al.
Snik et al.
Spindel et al.
Suzuki et al.
Tjellstrom et al.
Welling and Barnes
Yanagihara et al.
Smith and Nephew
St. Croix Medical
Med El (Symphonix)
Xomed-TreaceIHD R&D: Past and Present
Images courtesy of
Digital Signal Processor
Nominal Operating Parameters
• Battery life: > 12 years• Battery recharge time: 60 minutes (typical)• Battery recharge frequency: daily• Peak Output: 121 dB MET• Frequency Range: < 200 to 6250 Hz• Processor Type: 12 Band, 2 Ch. DSP
Fragility/Reliability of the Transducer
Coupling/Loading difficult for Surgeons
Images courtesy of
Reported patient selection criteria for Esteem, MET and Vibrant products(Note: Vibrant data includes proposed expansion pending FDA approval)
A round window implantable hearing device using a floating mass transducer
Development of a round window implantable hearing deviceJonathan H. Spindel, Paul R. Lambert, Roger A. Ruth(contributions by Michael A. Fuller)Department of Otolaryngology-HNS, University of Virginia, Charlottesville, Virginia, USADepartment of Integrated Science and Technology and Department of Communication Sciences and Disorders, James Madison University, Harrisonburg, Virginia, USA
An electromagnetic approach using a magnet applied to the round window membrane.
direct vibrational input to the cochlea
no disarticulation or potential ossicular erosion
Frequency-Specific ABR (Threshold Measures)
Energy transfer to the cochlea using a round window implantable hearing device(a temporal bone study)Jonathan H. Spindel1 and Geoffrey Ball2Department of Integrated Science and Technology and Department of Communication Sciences and Disorders, James Madison University, Harrisonburg, Virginia, USA 1Institute for Applied Physics, University of Innsbruck, Innsbruck, Austria 2
A FMT on the round window can be used to develop higher gain device along with providing for alternative therapy options for problematic middle ear anatomies and inoperable conductive hearing loss
Placement of a transducer closer to the cochlea will maximize energy transmission to the cochlea.