HEARING AID SYSTEM AND A METHOD OF OPERATING THEREOF

• US 20170326366A1
• Filed: 05/11/2017
• Published: 11/16/2017
• Est. Priority Date: 05/12/2016
• Status: Active Grant

• Current Assignee: University College London (University of London), Oticon Medical A/S (William Demant Fonden)
• Original Assignee: University College London (University of London), Oticon Medical A/S (William Demant Fonden)
• Inventors: RIIS, Sren Kamaric, FRATER, Attila, MARQUARDT, Torsten
• Granted Patent: US 10,639,474 B2
• Time in Patent Office: Days
• CPC Class Codes: A61N 1/0541 Cochlear electrodes
• 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 2225/0216 BTE hearing aids having a receiver in the ear mould
• CPC Class Codes: H04R 2225/43 Signal processing in hearing aids to enhance the speech intelligibility
• CPC Class Codes: H04R 2225/55 Communication between hearing aids and external devices via a network for data exchange
• CPC Class Codes: H04R 2225/67 Implantable hearing aids or parts thereof not covered by H04R25/606
• CPC Class Codes: H04R 2460/13 Hearing devices using bone conduction transducers
• CPC Class Codes: H04R 25/35 using translation techniques
• CPC Class Codes: H04R 25/353 Frequency, e.g. frequency shift or compression
• CPC Class Codes: H04R 25/356 Amplitude, e.g. amplitude shift or compression
• CPC Class Codes: H04R 25/505 using digital signal processing
• CPC Class Codes: H04R 25/554 using a wireless connection, e.g. between microphone and amplifier or using Tcoils
• CPC Class Codes: H04R 25/70 Adaptation of deaf aid to hearing loss, e.g. initial electronic fitting

Abstract

According to an embodiment, a hearing aid system is disclosed. The system includes a speech processor communicatively coupled to a microphone. The speech processor is configured to process a microphone signal received at the speech processor for producing an electrical stimulation signal and an acoustic stimulation signal. The speech processor is also configured to generate a modified acoustic stimulation signal by modifying the acoustic stimulation signal at least for a part of a residual frequency range of a patient in dependence on effect of an implantable electrode array on mechanical properties of cochlea of the patient. The system also includes a first unit and a second unit. The first unit comprising a cochlear implant communicatively coupled to the speech processor, the cochlear implant comprising the implantable electrode array configured to be located within a cochlea of the patient and to provide the electrical stimulation based on the electrical stimulation signal to a cochlea within a non-residual frequency range of the patient. The second unit communicatively coupled to the speech processor and adapted to provide the modified acoustic stimulation based on the modified acoustic stimulation signal to the cochlea within the at least in the part of the residual frequency range.

Claims

1. A hearing aid system comprising

a speech processor communicatively coupled to a microphone and configured to process a microphone signal received at the speech processor for producing an electrical stimulation signal and an acoustic stimulation signal, the speech processor being further configured to generate a modified acoustic stimulation signal by modifying the acoustic stimulation signal at least for a part of a residual frequency range of a patient in dependence on effect of an implantable electrode array on mechanical properties of cochlea of the patient;

a first unit comprising a cochlear implant communicatively coupled to the speech processor, the cochlear implant comprising the implantable electrode array configured to be located within a cochlea of the patient and to provide the electrical stimulation based on the electrical stimulation signal to a cochlea within a non-residual frequency range of the patient; and

a second unit communicatively coupled to the speech processor and adapted to provide the modified acoustic stimulation based on the modified acoustic stimulation signal to the cochlea within the at least in the part of the residual frequency range.

2. The hearing aid system according to claim 1, wherein the second unit is selected from a group consisting of an acoustic hearing aid configured to provide an air conduction acoustic simulation and a bone conduction hearing aid configured to provide a bone conduction acoustic stimulation.

3. The hearing aid system according to claim 1, wherein the effect of the electrode array on mechanical properties of cochlea comprises change in integrity of fine structures in the cochlea due to presence of the electrode array in the cochlea, thereby affecting the mechano-electric transduction characteristics of the cochlea at least in the part of the residual frequency range.

4. The hearing aid system according to claim 1, wherein the effect of the electrode array on mechanical properties of cochlea comprises an increase in stiffness of at least a part of basilar membrane of the cochlea due to presence of the electrode array in the cochlea.

5. The hearing aid system according to claim 1, wherein the speech processor is configured to

generate the acoustic stimulation signal comprising a first gain corresponding to a first frequency comprised within the residual frequency range in accordance with an audiogram of the patient;

and

modify at least one of the first gain and the first frequency to generate the modified acoustic stimulation signal comprising at least one of a second gain at the first frequency, the first gain at a second frequency and the second gain at the second frequency, wherein the modification counteracts the effect of the implantable electrode array on mechanical properties of the cochlea.

6. The hearing aid system according to claim 3, wherein the second gain is higher than the first gain and/or the second frequency is lower than the first frequency.

7. The hearing aid system according to claim 1, wherein the speech processor is configured to access a conversion model stored in a memory to generate the modified acoustic stimulation signal, the modified acoustic stimulation signal being configured to at least substantially counter the effect of the implantable electrode array on mechanical properties of the cochlea of the patient.

8. The hearing aid system according to claim 1, wherein the conversion model comprises a conversion function comprising at least one of an amplitude shift from the first gain to the second gain and a frequency shift from the first frequency to the second frequency for at least substantially countering the effect of the implantable electrode array on mechanical properties of the cochlea of the patient.

9. The hearing aid according to claim 1, wherein the conversion function is based on change in at least one of the first gain and the first frequency of the acoustic stimulation in the patient in response to at least one of characteristics of the implantable electrode array.

10. The hearing aid system according to claim 1, wherein the conversion function is based on an average change in at least one of the first gain and the first frequency of the acoustic stimulation in a sample population other than the patient in response to at least one of the characteristics of the implantable electrode array.

11. The hearing aid according to claim 1, wherein the characteristics of the implantable electrode array comprises one or a combination of a design of the implantable electrode array, mechanical properties of the implantable electrode array, insertion length of the implantable electrode array, distance of the implantable electrode array from the basilar membrane when the electrode array is located within the cochlea, and insertion technique for locating implantable electrode array into the cochlea.

12. The hearing aid according to claim 1, wherein the conversion function is based on variation in audiometric data for the patient prior to insertion of the cochlear array and after the insertion of the cochlear array within at least in the part of the residual frequency range.

13. The hearing aid system according to claim 1, wherein the conversion function is configured to be updated in accordance with variations in characteristics of the implantable electrode array over time.

15. The method according to claim 1, wherein modifying the acoustic stimulation signal is based on a conversion model comprising a conversion function that includes at least one of an amplitude shift from a first gain to a second gain and a frequency shift from a first frequency to a second frequency for at least substantially countering the effect of the implantable electrode array on mechanical properties of the cochlea of the patient.

19. The hearing aid system according to claim 2, wherein the effect of the electrode array on mechanical properties of cochlea comprises change in integrity of fine structures in the cochlea due to presence of the electrode array in the cochlea, thereby affecting the mechano-electric transduction characteristics of the cochlea at least in the part of the residual frequency range.

20. The hearing aid system according to claim 2, wherein the effect of the electrode array on mechanical properties of cochlea comprises an increase in stiffness of at least a part of basilar membrane of the cochlea due to presence of the electrode array in the cochlea.

14. A method for producing a dual-mode stimulation at a cochlea of a patient

processing, at a speech processor communicatively coupled to a microphone, a microphone signal received at the speech processor for producing an electrical stimulation signal and an acoustic stimulation signal,

generating, at the speech processor, a modified acoustic stimulation signal by modifying the acoustic stimulation signal at least for a part of a residual frequency range of a patient in dependence on effect of an implantable electrode array on mechanical properties of cochlea of the patient;

providing the electrical stimulation based on the electrical stimulation signal to a cochlea within a non-residual frequency range of the patient using a first unit comprising a cochlear implant communicatively coupled to the speech processor, the cochlear implant comprising the implantable electrode array configured to be located within a cochlea of the patient; and

providing the modified acoustic stimulation based on the modified acoustic stimulation signal to the cochlea within the at least in the part of the residual frequency range using a second unit communicatively coupled to the speech processor.

16. A method for customizing a hearing aid system configured to produce an acoustic stimulation and an electrical stimulation to a cochlea of a patient, the method comprising

determining a residual frequency range for a patient;

determining whether mechanical properties of a cochlea including basilar membrane of the patient is effected due to the presence of an implantable electrode array into the cochlea;

predicting the effect of the implantable electrode array on mechanical properties of cochlea of the patient;

creating a conversion model comprising a conversion function that is stored in a memory that is accessible by a speech processor, wherein

the conversion function comprises at least one of an amplitude shift from the a first gain to a second gain and a frequency shift from a first frequency to a second frequency for at least substantially countering the effect of the implantable electrode array on mechanical properties of the cochlea of the patient, the first gain and first frequency being based on an audiogram of the patient, and

the speech processor configured to process a received microphone signal for producing an electrical stimulation signal and an acoustic stimulation signal, the speech processor being further configured to generate a modified acoustic stimulation signal by modifying the acoustic stimulation signal at least for a part of a residual frequency range of the patient in dependence on effect of an implantable electrode array on mechanical properties of cochlea of the patient.

17. A computer readable medium for storing a computer readable instructions which when executed causes the speech processor that is communicatively coupled to a microphone to

process a microphone signal received at the speech processor for producing an electrical stimulation signal and an acoustic stimulation signal;

generate a modified acoustic stimulation signal by modifying the acoustic stimulation signal at least for a part of a residual frequency range of a patient in dependence on effect of an implantable electrode array on mechanical properties of cochlea of the patient;

provide the electrical stimulation based on the electrical stimulation signal to a cochlea within a non-residual frequency range of the patient using a first unit comprising a cochlear implant communicatively coupled to the speech processor, the cochlear implant comprising the implantable electrode array configured to be located within a cochlea of the patient; and

provide the modified acoustic stimulation based on the modified acoustic stimulation signal to the cochlea within the at least in the part of the residual frequency range using a second unit communicatively coupled to the speech processor.

18. A computer readable medium for storing a computer readable instructions which when executed causes the speech processor that is communicatively coupled to a microphone to

generate the acoustic stimulation signal comprising a first gain corresponding to a first frequency comprised within the residual frequency range in accordance with an audiogram of the patient;

and

modify at least one of the first gain and the first frequency generate the modified acoustic stimulation signal comprising at least one of a second gain at the first frequency, the first gain at a second frequency and the second gain at the second frequency, wherein the modification counteracts the effect of the implantable electrode array on mechanical properties of the cochlea.