Implantable auditory stimulation system and method with offset implanted microphones

Abstract

An improved implantable auditory stimulation system includes two or more implanted microphones for transcutaneous detection of acoustic signals. Each of the implanted microphones provides an output signal. The microphone output signals may be combinatively utilized by an implanted processor to generate a signal for driving an implanted auditory stimulation device. The implanted microphones may be located at offset subcutaneous locations and/or may be provided with different design sensitivities, wherein combinative processing of the microphone output signals may yield an improved drive signal. In one embodiment, the microphone signal may be processed for beamforming and/or directionality purposes.

1 . An implantable auditory stimulation system, comprising:
 a plurality of microphones, including at least a first microphone, operative to transcutaneously receive acoustic signals and generate a first microphone output signal in response thereto, and a second microphone operative to transcutaneously receive acoustic signals and generate a second output signal in response thereto;   a processor, operatively interconnected to said first microphone and to said second microphone, adapted to use said first microphone output signal and said second microphone output signal to generate a drive signal; and,   an implantable auditory stimulation device, operatively interconnected to said processor, adapted to stimulate an auditory system of a patient in response to said drive signal, wherein said first microphone has a different performance capability than said second microphone.   
     
     
         2 . An implantable auditory stimulation system as recited in  claim 1 , wherein said first microphone has a first predetermined minimum sensitivity across a first predetermined frequency range, wherein said second microphone has a second predetermined minimum sensitivity across a second frequency range, and wherein said first and second predetermined frequency ranges are at least partially non-overlapping. 
     
     
         3 . An implantable auditory stimulation system as recited in  claim 1 , further comprising:
 a first implantable housing, wherein said first microphone and said second microphone are supported by said first implantable housing.   
     
     
         4 . An implantable auditory stimulation system as recited in  claim 1 , further comprising:
 a first implantable housing, wherein said first microphone is disposed within the implantable housing; and,   a second implantable housing, wherein the second microphone is disposed within the second implantable housing, and wherein the first implantable housing and the second implantable housing are separately positionable.   
     
     
         5 . An implantable auditory stimulation system as recited in  claim 1 , further comprising:
 a flexible communication cable for use in operatively interconnecting at least one of said first microphone and said second microphone to said processor.   
     
     
         6 . An implantable auditory stimulation system as recited in  claim 5 , wherein said flexible communication cable includes a connector end for selectively operative interconnection of the communications cable to and disconnect of the communication cable from said processor. 
     
     
         7 . An implantable auditory stimulation system as recited in  claim 4 , wherein said processor is located in said first implantable housing. 
     
     
         8 . An implantable auditory stimulation system as recited in  claim 1 , further comprising:
 at least one first accelerometer co-located with the first microphone.   
     
     
         9 . An implantable auditory stimulation system as recited in  claim 1 , further comprising:
 at least one first accelerometer co-located with the first microphone, where the system is configured to utilize the first microphone and the first accelerometer for noise cancellation.   
     
     
         10 . An implantable auditory stimulation system as recited in  claim 1 , further comprising:
 at least one first accelerometer co-located with the first microphone; and   at least one second accelerometer co-located with the second microphone.   
     
     
         11 . An implantable auditory stimulation system as recited in  claim 1 , further comprising:
 a flexible communication cable having an end that is one of interconnected to, and interconnectable to and disconnectable from, said processor; and   a connector that is one of interconnected to, and interconnectable to and disconnectable from, another end of said flexible communication cable, wherein said connector includes a first port, and wherein said second microphone is selectively interconnectable to and disconnectable from said first port of the connector.   
     
     
         12 . An implantable auditory stimulation system as recited in  claim 11 , wherein said connector further includes a second port, and wherein said auditory stimulation device is selectively interconnectable to and disconnectable from said second port of the connector. 
     
     
         13 . An implantable auditory stimulation system, comprising:
 a plurality of microphones, including at least a first microphone, operative to transcutaneously receive acoustic signals and generate a first microphone output signal in response thereto, and a second microphone operative to transcutaneously receive acoustic signals and generate a second output signal in response thereto, wherein the first microphone is supported by a first implantable housing;   a processor, operatively interconnected to said first microphone and to said second microphone, adapted to use said first microphone output signal and said second microphone output signal to generate a drive signal; and   an implantable auditory stimulation device, operatively interconnected to said processor, adapted to stimulate an auditory system of a patient in response to said drive signal.   
     
     
         14 . An implantable auditory stimulation system as recited in  claim 13 , further comprising:
 a flexible communication cable having an end that is one of interconnected to, and interconnectable to and disconnectable from, said processor; and   a connector that is one of interconnected to, and interconnectable to and disconnectable from, another end of said flexible communication cable, wherein said connector includes a first port, and wherein said second microphone is selectively interconnectable to and disconnectable from said first port of the connector.   
     
     
         15 . An implantable auditory stimulation system as recited in  claim 14 , wherein said connector further includes a second port, and wherein said auditory stimulation device is selectively interconnectable to and disconnectable from said second port of the connector. 
     
     
         16 . An implantable auditory stimulation system as recited in  claim 13 , further comprising:
 at least one accelerometer supported by the first implantable housing.   
     
     
         17 . An implantable auditory stimulation system as recited in  claim 13 , wherein said first microphone has a first predetermined minimum sensitivity across a first predetermined frequency range, wherein said second microphone has a second predetermined minimum sensitivity across a second frequency range, and wherein said first and second predetermined frequency ranges are at least partially non-overlapping. 
     
     
         18 . An implantable auditory stimulation system as recited in  claim 13 , wherein said first microphone has a first predetermined minimum sensitivity of approximately -60 to -50 dBV/0.1 Pa across a first frequency range of 50 Hz to 3000 Hz, and wherein said second microphone has a second predetermined minimum sensitivity of approximately -60 to -50 dBV/0.1 Pa across a second predetermined frequency range of 1500 Hz to 10000 Hz. 
     
     
         19 . An implantable auditory stimulation system as recited in  claim 13 , wherein:
 said first microphone is disposed within the implantable housing, the system further comprising:
 a second implantable housing, wherein the second microphone is disposed within the second implantable housing, and wherein the first implantable housing and the second implantable housing are separately positionable, wherein 
   the first implantable housing and the second implantable housing correspond to the respective separate housings.   
     
     
         20 . An implantable auditory stimulation system as recited in  claim 19 , wherein said processor is located in said first implantable housing.