Totally implantable hearing system

• US 20020138115A1
• Filed: 03/20/2002
• Published: 09/26/2002
• Est. Priority Date: 03/26/2001
• Status: Active Grant

• Current Assignee: Cochlear Limited
• Original Assignee: Cochlear Limited
• Inventors: Leysieffer, Hans, Baumann, Joachim W.
• Granted Patent: US 6,807,445 B2
• Time in Patent Office: Days
• 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: H04R 25/505 using digital signal processing
• 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
• CPC Class Codes: H04R 25/75 Electric tinnitus maskers providing an auditory perception

Abstract

A totally implantable hearing system for rehabilitation of hearing disorders, comprising at least one implantable sensor for picking up at least airborne sound and for converting it into electrical airborne sound signals, and at least one implantable sensor for picking up at least body sound-induced signals and for converting them into electrical body sound signals. The hearing system further comprises an electronic module including electronic means for processing and amplification of said airborne sound signals and said body sound signals. The electronic means include means for individually adjusting the ratio of airborne sound signals to body sound signals. The hearing system also comprises an output-side actuator arrangement for stimulation of the middle or inner ear, and an electrical power supply unit which supplies individual components of the system with energy.

Claims

1. A totally implantable hearing system for rehabilitation of hearing disorders, comprising:

at least one implantable sensor for picking up at least airborne sound and for converting it into electrical airborne sound signals;

at least one implantable sensor for picking up at least body sound-induced signals and for converting them into electrical body sound signals;

an electronic module including electronic means for processing and amplification of said airborne sound signals and said body sound signals, said electronic means including means for individually adjusting the ratio of airborne sound signals to body sound signal;

an output-side actuator arrangement for stimulation of the middle or inner ear; and

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

2. The system of claim 1, wherein the at least one body sound sensor is a sensor selected from the group consisting of electromagnetic, electrodynamic, piezoelectric, magnetostrictive or dielectric sensors.

3. The system of claim 2, wherein the at least one body sound sensor is an on-chip semiconductor transducer.

4. The system of claim 1, wherein the at least one body sound sensor comprises a mechanical/electrical transducer which is coupled to an inert mass suspended for oscillating within a sensor housing.

5. The system of claim 1, wherein the at least one body sound sensor has a transmission range from about 100 Hz to about 10 kHz.

6. The system of claim 1, wherein the at least one body sound sensor is tuned to have first mechanical resonant frequency at an upper end of a desired transmission frequency range.

7. The system of claim 1, wherein the at least one body sound sensor is hermetically sealed.

8. The system of claim 1, wherein the at least one body sound sensor is adapted for implantation separate from the electronic module.

9. The system of claim 8, further comprising separable plug-type connector means for connecting the at least one body sound sensor to the electronic module.

10. The system of claim 1, wherein the at least one body sound sensor is integrated into the electronic module.

11. The system of claim 1, further comprising wireless telemetry means for transmission of data between the implanted part of the system and an external unit.

12. The system of claim 11, wherein said telemetry means is adapted for adjusting the ratio of airborne sound signals to body sound signals.

13. The system of claim 1, wherein the system is a binaural system for rehabilitation of a hearing disorder of both ears and has two system units, one each for each of two ears of a wearer, and wherein at least one of said system units is provided with a body sound sensor.

14. The system of claim 1, wherein the at least one airborne sound sensor is designed for picking up a mixture of airborne sound and body sound and for converting it into electrical signals.

15. The system of claim 1, wherein the at least one body sound sensor is designed for picking up substantially body sound only and for converting it into electrical signals.

16. The system of claim 1, comprising amplitude and phase relationship set means for at least one function selected from the group consisting of adjusting the amplitude and phase relationships between the airborne sound signals and the body sound signals, and of programming the amplitude and phase relationships between the airborne sound signals and the body sound signals.

17. The system of claim 1, comprising units for analog preamplification and subsequent analog electronic processing of the airborne sound signals and the body sound signals.

18. The system of claim 1, comprising units for preamplification and analog-to-digital conversion of the airborne sound signals and the body sound signals.

19. The system of claim 18, wherein the electronic means comprise a digital signal processor for at least one function selected from the group consisting of further processing of the digital data and of generating digital signals for tinnitus masking.

20. The system of claim 19, wherein the electronic means comprise a digital-to-analog converter unit, connected between the digital signal processor and the output-side actuator arrangement, for digital-to-analog conversion of control signals delivered by the signal processor for controlling the output-side actuator arrangement.

21. The system of claim 19, further comprising wireless telemetry means for transmission of data between the signal processor and an external programming system, wherein a rewritable implantable storage arrangement is assigned to the signal processor for storage and retrieval of an operating program, and wherein at least parts of the operating program are adapted to be at least partially replaced by data transmitted from the external programming system via the telemetry means.

22. The system of claim 21, further comprising a buffer storage arrangement in which data transmitted from the external programming system via the telemetry means are buffered before being relayed to the signal processor.

23. The system of claim 22, further comprising a checking logic for checking data stored in the buffer storage arrangement before said data are relayed to the signal processor.

24. The system of claim 19, comprising a microprocessor module for control of at least one of a digital-analog converter, said analog-digital converter, and said signal processor, via a data bus.

25. The system of claim 23, comprising a microprocessor module for control of at least one of a digital-analog converter, said analog-digital converter, and said signal processing unit, via a data bus;

wherein the checking logic and the buffer storage arrangement are implemented in the microprocessor module.

26. The system of claim 21, comprising a microprocessor module for control of at least one of a digital-analog converter, an analog-digital converter, and said signal processing unit via a data bus, wherein at least one of a plurality of program parts are adapted to be transferred between the external programming system, the microprocessor module and the signal processor via the data bus and the telemetry means.

27. The system of claim 26, wherein an implantable storage arrangement for storage of an operating program for the microprocessor module is assigned to the microprocessor module, and at least one of a plurality of parts of the operating program for the microprocessor module is adapted to be replaced by data transferred from the external programming system via the telemetry means.

28. The system of claim 21, comprising at least two storage areas for storage and retrieval of at least said operating program of the signal processor.

29. The system of claim 22, wherein the buffer storage arrangement comprises at least two storage areas for storage and retrieval of data transferred from the external programming system via the telemetry means.

30. The system of claim 19, wherein a preprogrammed read-only memory area is assigned to the signal processor.

31. The system of claim 21, wherein the telemetry means is adapted for transmission of operating parameters between the implantable part of the system and the external programming system.

32. The system of claim 16, wherein the electronic means comprise a digital signal processor which contains software modules implementing said amplitude and phase relationship set means.

33. The system of claim 19, wherein the digital signal processor contains software modules for controlling spectral, temporal amplitude- and phase-referenced signal properties of the output-side actuator arrangement.

34. The system of claim 19, wherein the digital signal processor contains software modules for tinnitus masking cocurrent with hearing device operation of the system.

35. The system of claim 19, wherein the digital signal processor contains a software module for optimized approximation of stimulation via an adaptive neural network.

36. The system of claim 35, wherein the neural network is adaptable to training by the implant wearer.

37. The system of claim 33, 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.

38. The system of claim 33, wherein the software modules are adaptively dynamic.

39. The system of claim 33, wherein the software modules are adaptive for parameter matching by implant wearer training.

40. The system of claim 1, wherein said output-side actuator arrangement comprises at least one electromechanical transducer for mechanical stimulation of one of the middle ear and the inner ear.

41. The system of claim 1, wherein said output-side actuator arrangement comprises intracochlear stimulation electrodes for electrical stimulation of the inner ear.

42. The system of claim 1, wherein said output-side actuator arrangement comprises a combination of at least one electromechanical transducer for mechanical stimulation of one of the middle ear and the inner ear, and of intracochlear stimulation electrodes for electrical stimulation of the inner ear.

43. The system of claim 1, wherein the electrical power supply unit comprises an implantable rechargeable energy storage element adapted for wireless transcutaneous charging by an external charging device.