At least partially implantable system for rehabilitation of a hearing disorder

• US 6,697,674 B2
• Filed: 04/13/2001
• Issued: 02/24/2004
• Est. Priority Date: 04/13/2000
• Status: Expired due to Term

• Current Assignee: Cochlear Limited
• Original Assignee: Cochlear Limited
• Inventors: Leysieffer, Hans
• Primary Examiner(s): Jastrzab, Jeffrey R.
• Application Number:
  US09/833,642
• Publication Number:
  US 20010031996A1
• Time in Patent Office: 1,047 Days
• Field of Search: 607/55-57, 607/137, 607/3, 600/25, 181/129-135, 381/312
• US Class Current: 607/57
• CPC Class Codes: A61N 1/36036 of the outer, middle or inner ear
• CPC Class Codes: A61N 1/36038 Cochlear stimulation
• CPC Class Codes: A61N 1/36039 fitting procedures
• CPC Class Codes: H04R 25/552 Binaural
• CPC Class Codes: H04R 25/554 using a wireless connection, e.g. between microphone and amplifier or using Tcoils
• CPC Class Codes: H04R 25/606 acting directly on the eardrum, the ossicles or the skull, e.g. mastoid, tooth, maxillary or mandibular bone, or mechanically stimulating the cochlea, e.g. at the oval window

Abstract

An at least partially implantable system for rehabilitation of a hearing disorder which has at least one sensor (microphone) for picking up an acoustic signal and converting it into corresponding electrical signals, an electronic signal processing unit for audio signal processing and amplification, an electrical power supply unit which supplies energy to individual components of the system, and an output-side actory stimulation arrangement. The output-side stimulation arrangement includes an electromechanical transducer for mechanical stimulation of the middle ear or inner ear and an intracochlear, electrically acting stimulation electrode array with at least one stimulation electrode for electrical stimulation of the inner ear.

Claims

1. At least partially implantable system for rehabilitation of a hearing disorder, comprising:

at least one sensor for picking up an acoustic signal and converting it into corresponding electrical signals;

an electronic signal processing unit for audio signal processing and amplification;

an electrical power supply unit which supplies individual components of the system with energy; and

an output-side actory stimulation arrangement;

wherein said output-side actory stimulation arrangement has an electromechanical transducer for mechanical stimulation of the middle ear and an intracochlear, electrically acting stimulation electrode array with at least one stimulation electrode for electrical stimulation of the inner ear.

2. System as claimed in claim 1, wherein the electromechanical transducer is a transducer selected from the group consisting of electromagnetic, electrodynamic, piezoelectric, magnetostrictive or dielectric transducers.

3. System as claimed in claim 1, wherein the output-side electromechanical transducer is adapted for direct mechanical coupling to the middle ear in an implanted state.

4. System as claimed in claim 1, wherein the output-side electromechanical transducer is adapted for a contactless, air gap-coupling to the middle ear in an implanted state.

5. System as claimed in claim 1, wherein the electromechanical transducer has a transmission range from about 100 Hz to about 10 kHz.

6. System as claimed in claim 1, wherein the electromechanical transducer is tuned to have a first mechanical resonant frequency at an upper end of a desired transmission frequency range.

7. System as claimed in claim 1, wherein the desired transmission frequency range to which the electromechanical transducer is tuned is from about 8 kHz to about 10 kHz.

8. System as claimed in claim 1, wherein the electromechanical transducer is hermetically sealed.

9. System as claimed in claim 8, wherein said at least one sensor comprises a plurality of the acoustic sensors with an analog-digital converter connected to the output thereof.

10. System as claimed in claim 1, wherein the signal processing unit has a preprocessing arrangement for providing at least one function selected from the group consisting of pre-amplification, pre-amplification and filtering, filtering or analog-digital (A/D) conversion of the acoustic sensor signals.

11. System as claimed in claim 1, wherein the signal processing unit contains software modules which enable tinnitus masking parallel to hearing aid operation.

12. System as claimed in claim 11, wherein the digital signal processor contains software modules for controlling the electromechanical transducer and the stimulation electrode array in a manner configuring spectral, time, amplitude-referenced and phase-referenced transducer and stimulation electrode signal properties for achieving optimum hearing success in a patient-specific manner.

13. System as claimed in claim 12, wherein the software modules are static containing results of scientific findings that are stored in a program storage of the digital signal processor and remain unchanged.

14. System as claimed in claim 12, wherein the software modules are adaptively dynamic.

15. System as claimed in claim 14, wherein the software modules are adaptive for parameter matching by implant wearer training.

16. System as claimed in claim 12, wherein the digital signal processor contains a software module for optimized approximation of stimulation via an adaptive neural network.

17. System as claimed in claim 16, wherein the neural network is adaptable to training by the implant wearer.

18. System as claimed in claim 11, wherein a rewritable implantable storage arrangement for storage and retrieval of an operating program is assigned to the signal processor, and wherein at least parts of the operating program are replacable by data transmitted from an external unit via telemetry means.

19. System as claimed in claim 18, further comprising a buffer storage arrangement for buffering data transmitted from the external unit via the telemetry means before said data are relayed to the signal processor.

20. System as claimed in claim 19, further comprising checking logic for checking data stored in the buffer storage arrangement before relaying said data to the signal processor.

21. System as claimed in claim 20, wherein the checking logic and the buffer storage arrangement are implemented in a microprocessor module.

22. System as claimed in claim 19, wherein the buffer storage arrangement comprises at least two storage areas for storage and retrieval of data transferred from an external unit via telemetry means.

23. System as claimed in claim 18, further comprising at least two storage areas for storage and retrieval of at least the operating program of the signal processor.

24. System as claimed in claim 11, further comprising a microprocessor module for control of system components via a data bus, said components being selected from the group consisting of an A/D converter, a D/A converter and said signal processor.

25. System as claimed in claim 24, wherein either of program parts and an entire software module are transferrable between an external unit, the microprocessor module and the signal processor via the data bus and telemetry means.

26. System as claimed in claim 24, wherein an implantable storage arrangement for storing a working program for the microprocessor module is assigned to the microprocessor module, and at least parts of the working program for the microprocessor module are replacable by data transferred from an external unit via telemetry means.

27. System as claimed in claim 1, wherein the signal processing unit comprises a digital signal processor which provides at least one function selected from the group consisting of processing A/D-converted acoustic sensor signals and generation of digital signals for tinnitus masking.

28. System as claimed in claim 27, wherein the electromechanical transducer and the at least one electrode of the stimulation electrode array have a digital-analog converter connected upstream thereof.

29. System as claimed in claim 27, wherein a preprogrammed read-only memory area which cannot be overwritten is assigned to the signal processor.

30. System as claimed in claim 27, further comprising telemetry means for transmission of operating parameters between an implanted part of the system and an external unit.

31. System as claimed in claim 1, further comprising at least one digital-analog converter which is connected to an input of the output-side stimulation arrangement.

32. System as claimed in claim 1, further comprising a wireless telemetry means for transmission of data between an implanted part of the system and an external unit.

33. System as claimed in claim 1, wherein the electrical power supply unit comprises a rechargeable electrical storage element;

wherein a wireless, transcutaneous charging device is provided for charging of the storage element; and

wherein the system is adapted to be totally implantable except for said transcutaneous charging device.

34. System as claimed in claim 1, further comprising a wireless remote control for control of system functions by an implant wearer.

35. System as claimed in claim 1, wherein said system is only partially implantable;

wherein said at least one acoustic sensor, said electronic signal processing arrangement, said power supply unit and a modulator/transmitter unit are contained in an external module which is externally wearable by an implant user; and

wherein an implantable part of the system is passive in terms of energy and receives transducer control data and operating energy via the modulator/transmitter unit in the external module.

36. System as claimed in claim 1, the system is binaural for rehabilitation of a hearing disorder of both ears, having two system units, one for each of the two ears of a user.

37. System as claimed in claim 36, wherein the two system units are essentially identical to one another.

38. System as claimed in claim 36, wherein one system unit is a master unit and the other system unit is a slave unit which is controlled by the master unit.

39. System as claimed in claim 36, further comprising a wired implantable line connection via which the signal processing module of the units communicate with one another for optimizing binaural signal processing and transducer array control.

40. System as claimed in claim 36, further comprising a wireless connection via which the signal processing module of the units communicate with one another for optimizing binaural signal processing and transducer array control.

41. System as claimed in claim 36, further comprising ultrasonic couplers via which the signal processing module of the units communicate with one another via an ultrasonic path coupled by bone conduction, in an implanted state, for optimizing binaural signal processing and transducer array control.

42. System as claimed in claim 36, wherein implantable electrodes are assigned to the signal processing module of the units, said electrodes being adapted to form part of a data transmission path which leads through body tissue of an implant wearer in an implanted state for communication between the signal processing modules of the two system units.