Custom hearing device equipped with optical sensors for biometrical sensing
A customized in-ear hearing device includes a light source, photodetector, light emission window, and light transmission window. The light source and the photodetector together function as a physiological sensor by emitting light from the light source through the light emission to the skin of a user's ear canal, and detecting at the photodetector light reflected by the skin that passes through the light detection window. The light emission window and light detection window are located at a customized portion of the sidewall of the device that contacts the skin in the ear canal.
1. A hearing device comprising:
a housing shell, at least a portion of the housing shell having a shape that is customized to a shape of a user's ear canal;
a light emission window configured to allow transmission of light through a sidewall of the housing shell, the light emission window being a window through the customized portion of the housing shell;
a light detection window configured to allow transmission of light through the sidewall of the housing shell, the light detection window being a window through the customized portion of the housing shell;
a light source configured to emit light from an interior of the housing shell to an exterior of the housing shell through the light emission window, the light source being at least partially contained in the housing shell;
a photodetector configured to detect light at the interior of the housing shell from the exterior of the housing shell through the light detection window, the photodetector being at least partially contained in the housing shell; and
circuitry contained in the housing shell and electrically connected to the light source and the photodetector and configured to control operation of the hearing device, including operation of the light source and the photodetector,
wherein the light source and/or the photodetector are mounted to a faceplate of the hearing device.
2. The hearing device of claim 1 , wherein the light source and/or the photodetector are electrically connected to the circuitry via at least one freely movable wire.
3. The hearing device of claim 1 , further comprising a printed circuit board (PCB), wherein the light source and the photodetector are mounted on opposing sides of the PCB.
4. The hearing device of claim 1 , wherein the customized portion of the housing shell comprises a surface indentation and/or a through hole, and the light source or the photodetector is positioned at the indentation or in the through hole.
5. The hearing device of claim 1 , further comprising a waveguide optically coupling the light source to the light emission window or optically coupling the photodetector to the light detection window, the waveguide extending at least partially within the sidewall of the customized portion of the housing shell.
6. The hearing device of claim 1 , wherein the light source is a light emitting diode.
7. The hearing device of claim 1 , wherein the light source and the photodetector constitute a photoplethysmography sensor.
8. A hearing device comprising:
a housing shell, at least a portion of the housing shell having a shape that is customized to a shape of a user's ear canal;
a light emission window configured to allow transmission of light through a sidewall of the housing shell, the light emission window being a window through the customized portion of the housing shell;
a light detection window configured to allow transmission of light through the sidewall of the housing shell, the light detection window being a window through the customized portion of the housing shell;
a light source configured to emit light from an interior of the housing shell to an exterior of the housing shell through the light emission window, the light source being at least partially contained in the housing shell;
a photodetector configured to detect light at the interior of the housing shell from the exterior of the housing shell through the light detection window, the photodetector being at least partially contained in the housing shell; and
circuitry contained in the housing shell and electrically connected to the light source and the photodetector and configured to control operation of the hearing device, including operation of the light source and the photodetector,
wherein the light emission window and the light detection window are each located at least 1 mm from an edge of the customized portion of the housing shell.
9. The hearing device of claim 1 , wherein at least a portion of the housing shell corresponding to the light emission window or the light detection window is made of a material transparent to wavelengths of light emitted by the light source.
10. The hearing device of claim 8 , wherein the light source and/or the photodetector are electrically connected to the circuitry via at least one freely movable wire.
11. The hearing device of claim 8 , further comprising a printed circuit board (PCB), wherein the light source and the photodetector are mounted on opposing sides of the PCB.
12. The hearing device of claim 8 , wherein the customized portion of the housing shell comprises a surface indentation and/or a through hole, and the light source or the photodetector is positioned at the indentation or in the through hole.
13. The hearing device of claim 8 , further comprising a waveguide optically coupling the light source to the light emission window or optically coupling the photodetector to the light detection window, the waveguide extending at least partially within the sidewall of the customized portion of the housing shell.
14. The hearing device of claim 8 , wherein at least a portion of the housing shell corresponding to the light emission window or the light detection window is made of a material transparent to wavelengths of light emitted by the light source.
15. The hearing device of claim 8 , wherein the light emission window and the light detection window are provided at a circumferential distance about the housing shell of at least one fourth of a total circumference of the housing shell.
16. The hearing device of claim 8 , wherein the light source is a light emitting diode.
17. The hearing device of claim 8 , wherein the light source and the photodetector constitute a photoplethysmography sensor.
18. A hearing device comprising:
a housing shell, at least a portion of the housing shell having a shape that is customized to a shape of a user's ear canal;
a light emission window configured to allow transmission of light through a sidewall of the housing shell, the light emission window being a window through the customized portion of the housing shell;
a light detection window configured to allow transmission of light through the sidewall of the housing shell, the light detection window being a window through the customized portion of the housing shell;
a light source configured to emit light from an interior of the housing shell to an exterior of the housing shell through the light emission window, the light source being at least partially contained in the housing shell;
a photodetector configured to detect light at the interior of the housing shell from the exterior of the housing shell through the light detection window, the photodetector being at least partially contained in the housing shell; and
circuitry contained in the housing shell and electrically connected to the light source and the photodetector and configured to control operation of the hearing device, including operation of the light source and the photodetector,
wherein the light emission window or the light detection window is located at a sealing zone of the housing shell, the sealing zone defined as a portion of the housing shell that is contact with the ear canal when the housing shell is inserted into the ear canal.
19. The hearing device of claim 18 , wherein the light source and/or the photodetector are electrically connected to the circuitry via at least one freely movable wire.
20. The hearing device of claim 18 , further comprising a printed circuit board (PCB), wherein the light source and the photodetector are mounted on opposing sides of the PCB.
21. The hearing device of claim 18 , wherein the customized portion of the housing shell comprises a surface indentation and/or a through hole, and the light source or the photodetector is positioned at the indentation or in the through hole.
22. The hearing device of claim 18 , further comprising a waveguide optically coupling the light source to the light emission window or optically coupling the photodetector to the light detection window, the waveguide extending at least partially within the sidewall of the customized portion of the housing shell.
23. The hearing device of claim 18 , wherein at least a portion of the housing shell corresponding to the light emission window or the light detection window is made of a material transparent to wavelengths of light emitted by the light source.
24. The hearing device of claim 18 , wherein the light emission window and the light detection window are provided at a circumferential distance about the housing shell of at least one fourth of a total circumference of the housing shell.
25. The hearing device of claim 18 , wherein the light source is a light emitting diode.
26. The hearing device of claim 18 , wherein the light source and the photodetector constitute a photoplethysmography sensor.
27. A hearing device comprising:
a housing shell, at least a portion of the housing shell having a shape that is customized to a shape of a user's ear canal;
a light emission window configured to allow transmission of light through a sidewall of the housing shell, the light emission window being a window through the customized portion of the housing shell;
a light detection window configured to allow transmission of light through the sidewall of the housing shell, the light detection window being a window through the customized portion of the housing shell;
a light source configured to emit light from an interior of the housing shell to an exterior of the housing shell through the light emission window, the light source being at least partially contained in the housing shell;
a photodetector configured to detect light at the interior of the housing shell from the exterior of the housing shell through the light detection window, the photodetector being at least partially contained in the housing shell; and
circuitry contained in the housing shell and electrically connected to the light source and the photodetector and configured to control operation of the hearing device, including operation of the light source and the photodetector,
wherein the light emission window and the light detection window are provided at a circumferential distance about the housing shell of at least one fourth of a total circumference of the housing shell.