Surgery – Truss – Pad
Patent
1985-04-22
1986-09-16
Kamm, William E.
Surgery
Truss
Pad
179107R, A61N 136, H04R 2500
Patent
active
046115986
ABSTRACT:
A multi-frequency transmission system for implanted hearing aid includes an external transmitting part and an encapsuled receiver part implantable into middle ear of the user. The transmitting part includes a microphone, a speech processor including a set of audio frequency band pass filters connected respectively via adjustable threshold switches to pulse shapers which release an audio frequency band only when an adjusted threshold level is exceeded. A plurality of high frequency transmitters is modulated by the signals from the pulse shapers. A pair of additional high frequency transmitters is controlled by the pulses from the speech processor to alternately transmit high frequency pulses corresponding to the polarity of the triggering pulses. A frequency channel selector is connected between the transmitters and the speech processor to activate simultaneously one of the transmitters from the bipolar high frequency stage and one of the amplitude modulated transmitters. The combined signal is applied to a transmitting coil and received by a receiver unit implanted in user's ear. The receiver includes a plurality of resonant circuits assigned to respective high frequency transmitters and a pair of switching transistors of opposite type of conductivity which are power supplied by a portion of a rectified high frequency signal and control the polarity of the excitation signal applied to the implanted electrodes.
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Merzenich et al., "Cochlear Implant Prostheses: Strategies and Progress" Annals of Bio. Med. Eng., vol. 8, pp. 361-368, Jun. 5, 1981.
Hochmair et al, "An Implanted Auditory Eight Channel Stimulator for the Deaf" Med. & Biol Eng. & Compat., vol. 19, No. 2, Mar. 1981, pp. 141-148.
Soma et al, "Fabrication and Packaging of an Implantable Multichannel Auditory Prosthesis" Conf. IEEE 1980 Frontiers of Engineering in Health Care Washington DC, Sep. 28-30, 1980, pp. 105-107.
Hortmann Guenter
Kunick Klaus
HORTMANN GmbH
Kamm William E.
Shein Mitchell J.
Striker Michael J.
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