US20230421975A1 - Hearing aid implant recharging system - Google Patents
Hearing aid implant recharging system Download PDFInfo
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- US20230421975A1 US20230421975A1 US18/240,272 US202318240272A US2023421975A1 US 20230421975 A1 US20230421975 A1 US 20230421975A1 US 202318240272 A US202318240272 A US 202318240272A US 2023421975 A1 US2023421975 A1 US 2023421975A1
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Definitions
- Embodiments of the present disclosure generally relate to assistive hearing devices and methods for recharging thereof. More particularly, embodiments of the present disclosure are related to recharging of hearing aid implants via light emitting diode-photovoltaic systems.
- Hearing aids are well known and typically include a microphone, an amplifier, and a speaker.
- the microphone receives a sound wave and converts the wave into an electrical signal
- the amplifier amplifies the electrical signal
- the speaker converts the amplified signal into amplified sound waves that impart vibrations to the tympanic membrane or ear drum in the ear.
- hearing aids are mounted outside the ear canal, particularly around the outer ear.
- the externally mounted hearing aid has the advantage of accessibility to adjust the volume of sound and change batteries.
- many users find such externally mounted hearing aids to be relatively bulky and objectionable for cosmetic and comfort reasons.
- An alternative to externally mounted hearing aids are internally mounted hearing aids disposed in an ear canal of a user.
- Conventional internally mounted hearing aids offer better cosmetic appearance, but have disadvantages as well.
- Such hearings aids are usually employed for extended periods of time and utilize microelectronic chipsets that consume large amounts of power, therefore requiring repeated replacement of batteries every few days or frequent recharging with bulky inductive charging devices.
- the frequent battery replacement and/or recharging requirements make internally mounted hearing aids less desirable for active people and children, resulting in a significant impact on quality life for the hearing impaired members of the population.
- the present disclosure generally relates to methods and apparatus for recharging of internally mounted hearing aids, and more particularly, recharging of internally mounted hearing aid implants via light emitting diode-photovoltaic systems.
- a charging system for a hearing aid implant disposed through a tympanic membrane of an ear includes one or more photovoltaic (PV) cells located on a proximal end of the hearing aid implant and one or more light sources configured to be inserted in or near an entrance of an ear canal of the ear.
- the one or more light sources emit a light energy receivable by the one or more PV cells to charge the hearing aid implant.
- a charging system for a hearing aid implant disposed through a tympanic membrane of an ear includes one or more photovoltaic (PV) cells located on a proximal end of the hearing aid implant and a charging device configured to be inserted in or near an entrance of an ear canal of the ear.
- the charging device further includes one or more light sources emitting a light energy receivable by the one or more PV cells of the hearing aid implant and having a wavelength corresponding to a wavelength range of high reflectivity by one or more surfaces of the ear canal.
- the one or more PV cells convert the light energy into stored electricity to power the hearing aid implant
- a charging system for a hearing aid implant disposed through a tympanic membrane of an ear includes one or more photovoltaic (PV) cells located on a proximal end of the hearing aid implant and a charging device configured to be inserted in or near an entrance of an ear canal of the ear.
- the charging device further includes one or more high spectral purity, high efficiency resonant cavity light emitting diodes (LEDs) for emitting a light energy having a wavelength corresponding to a wavelength range of high reflectivity by one or more surfaces of the ear canal.
- a support device is coupled to the one or more LEDs and is configured to at least partially rest external to the ear canal and secure the charging device to the ear.
- the one or more PV cells are configured to absorb the light energy emitted directly from the one or more LEDs as well as light energy reflected by the one or more surfaces of the ear canal and convert the light energy into stored electricity to power the implanted hearing aid.
- FIG. 1 illustrates a schematic cross-sectional view of an ear having a hearing aid implanted through a tympanic membrane and a wireless charging device inserted near an entrance of the ear canal.
- FIGS. 2 A- 2 B illustrate schematic cross-sectional views of a light source assembly of the wireless charging device of FIG. 1 .
- FIGS. 3 A- 3 B illustrate schematic cross-sectional views of a photovoltaic assembly of the hearing aid of FIG. 1 .
- FIGS. 4 A- 4 B illustrate perspective views of the hearing aid of FIG. 1 .
- FIGS. 5 A- 5 B illustrate an aural insert for the wireless charging device of FIG. 1 .
- FIG. 6 illustrates an external support device for the wireless charging device of FIG. 1 .
- FIGS. 7 A- 7 D illustrate an external support device for the wireless charging device of FIG. 1 .
- FIGS. 8 A- 8 C illustrate an external support device for the wireless charging device of FIG. 1 .
- FIG. 9 illustrates an external support device for the wireless charging device of FIG. 1 .
- FIGS. 10 A- 10 B illustrate external support devices for the wireless charging device of FIG. 1 .
- FIG. 11 illustrates an external support device for the wireless charging device of FIG. 1 .
- FIGS. 12 A- 12 B illustrate an external support device for the wireless charging device of FIG. 1 .
- FIGS. 13 A- 13 B illustrate an accessory for an external support device of the wireless charging device of FIG. 1 .
- FIGS. 14 A- 14 B illustrate an external support device for the wireless charging device of FIG. 1 .
- FIGS. 15 A- 15 B illustrate an external support device for the wireless charging device of FIG. 1 .
- FIGS. 16 A- 16 B illustrate an external support device for the wireless charging device of FIG. 1 .
- FIGS. 17 A- 17 B illustrate an external support device for the wireless charging device of FIG. 1 .
- FIGS. 18 A- 18 B illustrate an external support device for the wireless charging device of FIG. 1 .
- FIGS. 19 A- 19 B illustrate an external support device for the wireless charging device of FIG. 1 .
- FIGS. 20 A- 20 B illustrate an external support device for the wireless charging device of FIG. 1 .
- FIGS. 21 A- 21 B illustrate an external support device for the wireless charging device of FIG. 1 .
- FIGS. 22 A- 22 B illustrate an external support device for the wireless charging device of FIG. 1 .
- the present disclosure relates to charging and recharging systems for compact hearing aids, components thereof, and support devices therefor.
- the charging and recharging systems generally include a light emitting device, such as an aural insert having a light emitting diode, and a photovoltaic cell disposed on an implanted hearing aid.
- the light emitting device is positioned in or near the entrance of the ear canal and transmits light energy across the ear canal towards the implanted hearing aid.
- the photovoltaic cell receives the light energy and converts the light energy into stored electricity to power the implanted hearing aid.
- the light emitting device further transmits one or more wireless command signals to the implanted hearing aid, which may execute commands (e.g., functions) based on the wireless command signals received from the light emitting device.
- the embodiments described herein provide exemplary configurations of implanted hearing aids contemplated by the present disclosure. However, any other suitable configurations for hearing aids that modulate the velocity or the position of the tympanic membrane, by direct or indirect modulation, are also contemplated.
- the embodiments that follow discuss inserting the disclosed compact hearing aids through the tympanic membrane as an example; however, the compact hearing aids are also disposable in other locations within the ear.
- FIG. 1 is a schematic cross-sectional view of an ear 100 having a hearing aid implanted through the tympanic membrane and a wireless charging device inserted into the ear canal thereof.
- the ear 100 includes an outer ear 110 , an ear canal 112 coupled to the outer ear 110 , and a tympanic membrane 114 disposed near a proximal end of the ear canal 112 from the outer ear 110 .
- the structure of the outer ear 110 provides a “funnel” to direct and amplify the amplitude of sound waves into the ear canal 112 .
- An ossicular chain 115 located in a middle ear and disposed on a medial side of the tympanic membrane 114 from the outer ear 110 , couples and amplifies vibrations from the tympanic membrane 114 to an inner ear having a spiral structure known as the cochlea 120 .
- the cochlea 120 converts the vibrations into impulses to the brain.
- Hearing aids such as hearing aid 122 , of the present disclosure can be inserted through the outer ear 110 into the ear canal 112 and at least partially through the tympanic membrane 114 .
- the hearing aid 122 generally includes a sensor, such as a microphone, and at least one eardrum stimulating member described in more detail below.
- the hearing aid 122 generally receives sound waves conducted from the outer ear 110 through the ear canal 112 , converts the sound waves into electrical or electromagnetic signals, and converts the electrical signals into mechanical motion, which is typically called a feed-forward system.
- the mechanical motion is used to impact the tympanic membrane 114 , and/or portions of the middle and inner ear, to vibrate the ossicular chain 115 , specifically the malleus 118 , the incus 117 , and the stapes 116 .
- These three bones in the ossicular chain 115 act as a set of levers that amplify the amplitude of the vibrations received by the tympanic membrane 114 .
- the stapes 116 is coupled to the entrance of a spiral structure known as the cochlea 120 that contains an inner ear fluid.
- the mechanical vibrations of stapes 116 cause the fluid to develop fluid impulses that cause small hair-like cells (not shown) in the cochlea 120 to vibrate.
- the vibrations are transformed into electrical impulses, which are transmitted to neuro-pathways in the hearing center of the brain resulting in the perception of sound.
- the hearing aid 122 may be fixedly inserted through the tympanic membrane 114 , one or more energy sources (e.g., batteries) thereof may be recharged with a wireless charging device 142 .
- the charging device 142 like the hearing aid 122 , may also be inserted through the outer ear 110 and into the ear canal 112 for wireless transfer of energy to the hearing aid 122 implanted therein to power the hearing aid 122 . Additionally, the charging device 142 may wirelessly communicate with the hearing aid 122 and transfer one or more wireless command signals thereto.
- the hearing aid 122 audibly signals to the user a power level (e.g., charge state) thereof and/or the execution of the one or more commands communicated by the wireless charging device 142 .
- the hearing aid 122 may produce an audible tone for the user signaling a low-charge level, a fully-charged level, a volume level and/or adjustment, and activation and/or deactivation (e.g., power on or power off) of the hearing aid 122 .
- the charging device 142 generally includes one or more light emitting components (e.g., light sources) for optically coupling with the hearing aid 122 to transfer energy thereto in the form of light.
- the hearing aid 122 generally includes one or more photovoltaic (PV) assemblies (e.g., light-receiving surfaces or cells) for receiving light emitted from the charging device 142 and converting the light into electricity using semiconducting materials exhibiting the photovoltaic effect.
- PV photovoltaic
- FIGS. 2 A- 2 B illustrate schematic cross-sectional views of a light source assembly 200 and a light source 210 of the wireless charging device 142 , respectively.
- the light source assembly 200 is generally disposed on a distal end of the charging device 142 , which may include an earpiece or aural insert that is configured to be easily inserted into and removed from the ear canal.
- the ability to insert and remove the charging device 142 from the ear canal enables charging/recharging of the charging device 142 itself and/or cleaning thereof.
- the light source assembly 200 may be disposed at a distance of about 30 cm or less from a light receiver, such as a photovoltaic cell, of the hearing aid 122 .
- the light source assembly 200 may be disposed at a distance of between about 2 mm and about 30 mm from the hearing aid 122 , such as a distance of between about 10 mm and about 20 mm from the hearing aid 122 . In certain embodiments, the light source assembly 200 is disposed at a distance from the hearing aid 122 substantially equal to a length of the user's ear canal.
- distal refers to a portion of the light emitting assemblies, hearing aids, or support devices closest to the cochlea when inserted into the ear canal, or a direction toward the cochlea.
- proximal refers to a portion of the light emitting assemblies or hearing aids furthest to the cochlea when inserted into the ear canal, or a direction away from the cochlea.
- the light source assembly 200 includes at least one light source 210 disposed on a light-reflective substrate holder 220 and encapsulated within an encapsulant 230 .
- a plurality of light sources 210 are arranged in one or more arrays on the light-reflective substrate holder 220 and are encapsulated within the encapsulant 230 .
- the substrate holder 220 reflects any radially- and/or proximally-emitted light from the light sources 210 in a distal direction through the encapsulant 230 , thus enabling maximum light delivery to the hearing aid 122 within the ear canal.
- the substrate holder 220 may be formed of thin reflective films of aluminum, silver, chromium, and other suitable metals having a cup-like morphology around each light source 210 .
- the substrate holder 220 is formed of multiple layers of materials with differing optical properties, such as titanium dioxide and silicon dioxide, to form a Bragg mirror structure.
- the encapsulant 230 is formed of any suitable optically-clear materials including, but not limited to, epoxy and polyurethane resins, for protecting the light source 210 while also enabling transmission of light therefrom.
- the light source assembly 200 further includes two terminals 240 and 250 disposed through the encapsulant 230 and electrically coupled with the at least one light source 210 .
- the terminals 240 and 250 are positive and negative current-driving terminals, respectively, that enable application of current to the light sources 210 to turn the light sources 210 on.
- the light source assembly 200 also includes one or more secondary optics, such as a lens 260 , to manipulate light emission distribution of the light sources 210 .
- a lens 260 focuses or collimates light from the one or more light sources 210 in the distal direction to improve light delivery to the hearing aid 122 .
- the lens 260 creates a light field having a diameter of approximately 1 cm or greater to illuminate the entire ear canal, thus ensuring that the hearing aid 122 is within a propagation path of the light source assembly 200 .
- the lens 260 is configured to focus the emitted light on a focal plane disposed at a distance from the light source assembly 200 between about 1 mm and about 30 mm, such as between about 5 mm and about 25 mm, such as between about 10 mm and about 20 mm, such as about 15 mm.
- the light-propagating properties of the lens 260 may be adjustable.
- Each light source 210 generally emits incoherent light having a wavelength corresponding to the wavelength range of high light reflectivity by the tympanic membrane and other surfaces within the ear canal, thus enabling multiple reflections and optimal capture of indirect scattered light by the hearing aid 122 .
- the light sources 210 may include light emitting diodes (LED) configured to emit light having a wavelength in the range from about 400 nm to about 1100 nm, such as a wavelength in the range from about 400 nm to about 870 nm, such as a wavelength of about 800 nm.
- the light sources 210 include narrow wavelength light sources, such as a GaxAl (1-x) As-type LEDs, where x is between about 0.5 and about 1.
- the light sources 210 include multiple wavelength light sources, such as a white light LEDs. It is further contemplated that a peak wavelength of the light sources 210 is generally between about 25 nm and 75 nm less than a peak absorptivity of receiving PV cells of the hearing aid 122 . For example, the peak wavelength of the light sources 210 may be about 50 nm less than a peak absorptivity of the PV cells of the hearing aid 122 .
- the light sources 210 of the light source assembly 200 may include any suitable types of light sources for illuminating the PV assembly of the hearing aid 122 while also having a low power density to avoid uncomfortable heating of the patient's ear canal.
- the light sources may have a maximum power dissipation of about 120 mW or less.
- Other suitable types of light sources include incandescent light and coherent light sources, such as laser-based light sources.
- FIG. 2 B An exemplary structure of an LED-type light source 210 is depicted in FIG. 2 B .
- the light source 210 depicted in FIG. 2 B is a high spectral purity, high efficiency resonant cavity LED (RCLED) and comprises an active region 276 disposed between a plurality of n-type semiconductor layers 270 and a plurality of p-type semiconductor layers 280 , thus forming a double heterostructure.
- the heterostructure of the LED-type light source 210 is stacked between an n+ (very heavily doped n-type) substrate 290 and a p+ GaAs layer 292 adjacent a metal contact 294 for coupling with terminals 240 , 250 .
- the active region 276 includes one or more multiquantum well layers formed of GaInP, AlGaAs, and/or Al (1-x) Ga x InP to trap injected charge carriers therein and improve recombination of electrons and holes for photon emission.
- the pluralities of layers 270 , 280 may include one or more cladding layers 272 , 282 adjacent to the active region 276 and formed of GaAs.
- the pluralities of layers 270 , 280 may further include one or more Bragg reflector layers 274 , 284 to increase the light output power of the light source 210 .
- the light source 210 may also be a surface mounted device LED (SMD LED) having an LED chip with a phosphor layer disposed in a flat top lens mounted on a printed circuit board (PCB).
- SMD LED surface mounted device LED
- PCB printed circuit board
- FIGS. 3 A- 3 B illustrate schematic cross-sectional views of a photovoltaic (PV) assembly 300 and a PV cell 310 of the hearing aid 122 , respectively.
- the PV assembly 300 is generally disposed on a proximal portion of the hearing aid 122 within the ear canal for optical coupling with the charging device 142 while avoiding interference with the sound detection and amplification functions of the hearing aid 122 .
- the PV assembly generally includes at least one PV cell 310 that electrically couples with a power input of the hearing aid 122 via positive and negative leads 340 and 350 , respectively.
- the PV assembly 300 includes a plurality of PV cells 310 arranged in one or more arrays.
- a plurality of PV cells 310 may be partitioned and isolated such that they can be connected in a serial configuration for higher voltage output, thus eliminating the need for DC-DC converters and eliminating related DC-DC up-conversion losses.
- each PV cell 310 is a single or multi-junction (e.g., double junction, triple junction) semiconductor device configured to absorb the energy of light produced by the charging device 142 and convert it directly into electricity to power the hearing aid 122 . Utilization of multiple junctions may increase the energy absorption and/or conversion properties of the PV cells 310 .
- the output voltage of a single junction GaAs PV is between about 0.2V and about 0.9V, and the output power is between about 10 mW and about 80 mW, depending on current density.
- the PV cells 310 may be optimized for absorption of either broad or narrow wavelength light, such as achromatic or monochromatic light.
- the PV cells 310 absorb light energy emitted by the charging device 142 that is reflected off the skin within the ear canal.
- the light sources 210 and the PV cells 310 may emit and absorb light having a wavelength corresponding to optimal skin reflectivity, such as about 800 nm.
- a wavelength corresponding to optimal skin reflectivity such as about 800 nm.
- surfaces within the ear canal such as those of the tympanic membrane, have a high reflectance (0.8), low absorbance (0.1), and low transmittance (0.1), thus enabling optimum transmission of light energy within the ear canal.
- FIG. 3 B An exemplary structure of a PV cell 310 is depicted in FIG. 3 B according to embodiments of this disclosure.
- the PV cell 310 is a GaAs-based PV cell formed on a thinned N+ GaAs substrate 390 , thus having a reduced mass and profile.
- An n-type Bragg reflector layer 370 , an n-type base layer 372 , a thin p-type emitter layer 382 , and a p-type window layer 384 are stacked above the substrate 390 .
- the base layer 372 and the emitter layer 782 may be formed of GaAs
- the window layer 784 is formed of Al 1-x GaAs.
- the PV cell 310 further includes a p+ GaAs capping layer 386 formed on the window layer 784 .
- the bandgaps of the active layers of the PV cell 310 are matched closely with the bandgaps of the active layers of the light sources 210 for optimal energy transfer therebetween.
- exemplary embodiments of the PV cell 310 are described with reference to FIG. 3 B , those skilled in the art will understand that the PV cell 310 may be optimized by tailoring the composition and structure of the various components or layers thereof.
- the PV assembly 300 is generally disposed on a proximal portion of the hearing aid 122 within the ear canal and in an arrangement that avoids interference with the sound detection and amplification functions of the hearing aid 122 .
- FIGS. 4 A and 4 B illustrate exemplary arrangements of PV assemblies 300 on the hearing aid 122 in accordance with embodiments of the present disclosure.
- the hearing aid 122 includes a proximal end 410 comprised of at least two oblique and converging surfaces 420 a and 420 b disposed at angles relative to a major axis A of the hearing aid 122 , thus forming a wedge-like shape.
- the oblique surfaces 420 a and 420 b may be disposed at substantially equal angles relative to the major axis A. In certain other embodiments, the oblique surfaces 420 a and 420 b may be disposed at substantially different angles relative to the major axis A. Generally, a microphone 430 or other sound detecting device is disposed on the first oblique surface 420 a , while one or more PV assemblies 300 are disposed on the second oblique surface 420 b .
- both the microphone 430 and the PV assemblies 300 may be aligned to receive direct and indirect (e.g., reflected) acoustic and light energy from the ear canal.
- the proximal end 410 of the hearing aid 122 is substantially cylindrical in shape and has a proximal face 440 substantially perpendicular to the major axis A of the hearing aid 122 .
- Either the microphone 430 or the one or more PV assemblies 300 may be disposed on the proximal face 440 (microphone 430 is shown in FIG. 4 b ), while the other is disposed along the circumferential surface 450 about the hearing aid 122 .
- the microphone 430 or the PV assemblies 300 may receive direct acoustic or light energy, while the other receives indirect acoustic or light energy reflected by the surfaces of the ear canal.
- the one or more PV cells 310 of the PV assemblies 300 may absorb light energy emitted by charging device 142 that is reflected off the skin within the ear canal, such as light having a wavelength of about 800 nm.
- the charging device 142 may further be configured to wirelessly transmit one or more types of communication signals to the hearing aid 122 for wireless communication between the charging device 142 and the hearing aid 122 .
- the hearing aid 122 may be configured to send a modulated signal to the hearing aid 122 for relaying desired commands thereto. Examples of commands that may be communicated between the charging device 142 and the hearing aid 122 include commands to power on and power off the hearing aid 122 , or increase and lower the volume thereof.
- the present disclosure further contemplates the charging device 142 comprising an aural insert or external support device for securing the light source assembly 200 within or near the ear canal.
- the charging device 142 comprising an aural insert or external support device for securing the light source assembly 200 within or near the ear canal.
- the light source assembly 200 and thus, the one or more light sources 210 ) be secured in close proximity to and oriented towards the one or more PV assemblies 300 of the hearing aid 122 .
- FIGS. 5 A- 5 B illustrate an exemplary aural insert 500 for positioning the light source assembly 200 near the tympanic membrane 114 to provide a direct, clear line of site from the light source assembly 200 to the hearing aid 122 .
- the light source assembly 200 is coupled to a distal end 510 of the aural insert 500 which is inserted into the user's ear canal 112 , while a proximal end 520 is configured to rest on the concha bowl, the intertragic notch, behind the tragus, or about the entrance of the ear canal 112 .
- the proximal end 520 further provide a port for connection to a power source to charge the charging device 142 .
- the distal end 510 is shaped to fit within and traverse at least a portion of the user's ear canal 112 , such as between about 1 ⁇ 2 and about 2 ⁇ 3 of the length of the ear canal 112 , to ensure that light from the light source assembly 200 is not impeded by anatomical features or tortuosity of the ear canal 112 .
- the aural insert 500 may have a channel formed through a length thereof (e.g., from a proximal to distal end of the aural insert 500 ) so as to not impede hearing of the user while wearing the aural insert 500 .
- the aural insert 500 is custom-profiled via ear impression or 3 D imaging to match the shape of a specific user's ear canal 112 , thus enabling a custom and secure fit.
- the aural insert 500 may be formed of relatively rigid materials, such as acrylates and/or methacrylates.
- the aural insert 500 has a universal fit and does not require custom profiling, and is thus formed of suitable malleable or flexible materials to conform to the tortuosity and length of the ear canal 112 . Examples of suitable malleable materials include polymers such as rubber and silicone, polyurethane, foam, advanced plastics, and the like.
- the aural insert 500 may be compressed by the user prior to insertion within the ear canal 112 , after which the aural insert 500 may decompress to fill the ear canal 112 .
- the aural insert 500 is formed of an optically transparent or translucent material to enable transmission of light therethrough.
- the present disclosure also contemplates the charging device 142 comprising other types of external support devices for securing or mounting the light source assembly 200 within or near the ear canal.
- the external support devices are generally disposed near the ear canal, over the ear, around the ear, or in the vicinity of the user's head.
- Exemplary external support devices include ear buds, earmuffs, over-the-ear clips, glasses stem clips, headbands, and devices in or around the vicinity of the user's head that can be placed near the ear canal, over the ear, around the ear, or in the vicinity of the user's head to enable interaction between the light source assembly 200 and the PV assemblies 300 of the hearing aid 122 .
- FIG. 6 illustrates one such external support device in the form of earmuffs 600 for securing and stabilizing a light source assembly 200 in or near the ear canal of a user.
- the earmuffs 600 include a headband 610 coupled to two ear cups 620 at opposing ends thereof, wherein at least one ear cup 620 has a light source assembly 200 disposed therein.
- the ear cups 620 are placed over the external ear (e.g., over the concha bowl) of the user, thus positioning the light source assembly 200 near the entrance of the user's ear canal for recharging of the hearing aid 122 .
- the light source assembly 200 may be disposed within a removable pod 640 for easy insertion and removal from the earmuffs 600 .
- the earmuffs 600 also include a USB port 630 for USB charging of the earmuffs 600 .
- FIGS. 7 A- 7 D illustrate another exemplary external support device in the form of a headband 700 .
- the headband 700 includes at least one pouch 710 disposed on an internal or external side thereof for securing a light source assembly 200 near a user's ear canal when worn over the external ear of the user.
- the pouch 710 may be configured to receive the light source assembly 200 within a pod 640 for easy insertion and removal therefrom.
- the headband 700 is generally formed of any suitable materials, including fabrics or polymeric materials such as silicone for user comfort.
- the headband 700 is a standalone device.
- the headband 700 is further integrated with another piece of headwear, such as a hat or skullcap 720 , to be worn by the user during use of the charging device 142 .
- FIGS. 8 A- 8 C illustrate exemplary eyeglass stem clips 800 for securing the light source assembly 200 in or near the ear canal of a user.
- the eyeglass stem clips 800 may slide over or attach to (e.g., clip to) the stems 820 of a pair of eyeglasses 810 during use thereof.
- the eyeglass stem clips 800 may be removed from the eyeglasses 810 and coupled with a charging dock 830 having a USB port 840 for charging/recharging thereof.
- the eyeglass stem clips 800 are generally formed of any suitable materials, including polymeric materials such as silicone.
- FIG. 9 illustrates an exemplary eyeglass frame 900 having a light source assembly 200 integrated therewith.
- one or both stems 920 of the eyeglass frame 900 has a protrusion 930 extending therefrom and configured to receive a light source assembly 200 .
- the protrusion 930 extends over the ear and positions the light source assembly 200 in or near the user's ear canal.
- the eyeglass frame 900 may have a USB port for USB charging/recharging of the eyeglass frame 900 when not in use.
- FIGS. 10 A- 10 B illustrate exemplary concha devices 1000 and 1001 for positioning the light source assembly 200 in or near the ear canal while substantially resting within the concha bowl (e.g., cavum concha) of the user's ear.
- the concha devices 1000 and 1001 comprise a base 1010 coupled to a fitting 1020 .
- Concha device 1001 further includes a stem 1030 for easier handling by a user.
- the base 1010 houses the light source assembly 200 and any corresponding circuitry and rests external to the ear canal during use, while the fitting 1020 is configured to fit into the ear canal and secure (e.g., anchor) the device to the user's ear.
- the fitting 1020 is formed of any suitable malleable or flexible material to conform to the tortuosity of the ear canal, including polymers such as rubber and silicone, polyurethane, foam, and/or advanced plastics. Accordingly, the fitting 1020 may be compressed by the user prior to insertion within the ear canal, after which the fitting 1020 may decompress to fill the ear canal.
- the material of the fitting 1020 is optically transparent or translucent to enable transmission of light therethrough.
- the fitting 1020 has a cavity or channel formed therein to enable transmission of light from the light source assembly 200 to the hearing aid 122 .
- FIGS. 11 , 12 A- 12 B, and 13 A- 13 B illustrate additional components that may be utilized in combination with the concha devices 1000 and 1001 described above.
- the concha device 1000 removably couples to stems 1110 of a headband 1100 , which may further include a USB port 1120 for USB charging/recharging of the headband 1100 and/or concha device 1000 .
- the headband 1100 provides additional support for securing the concha device 1000 within the concha bowl during use thereof.
- either of the concha devices 1000 or 1001 may further be secured to a neckband 1200 by cables 1210 .
- FIGS. 13 A- 13 B depict a portable and modular charging unit 1300 for the concha device 1000 .
- the charging unit 1300 includes a charging base 1310 having USB port 1320 for USB charging/recharging of one or more concha devices 1000 .
- the concha devices 1000 may anchor to opposing sides of the charging base 1310 by any suitable means, including mechanical or magnetic mechanisms.
- the charging unit 1300 also includes one or more caps 1330 that attach to the charging base 1310 or the concha devices 1000 themselves and cover the concha devices 1000 when anchored to the base 1310 .
- the one or more caps 1330 are further coupled to a keychain 1340 or other tethering device for attachment to other devices.
- FIGS. 14 A- 14 B, 15 A- 15 B, and 16 A- 16 B illustrate further examples of external support devices for securing the light source assembly 200 in or near the ear canal of a user.
- the light source assembly 200 is coupled to distal ends of ear cuffs 1400 , 1500 , and 1600 , respectively, which encircle or wrap around various features of the external ear for support.
- the ear cuff 1400 encircles the upper helix 1410 of the ear and extends down past the crus 1412 of the helix to the entrance of the ear canal 112 , where it secures the light source assembly 200 .
- the ear cuff 1500 wraps around a portion of the lower helix 1416 and extends therefrom to the entrance of the ear canal 1214 , thus extending past the lower antihelix 1418 and the concha bowl 1426 .
- the ear cuff 1600 includes two arms 1610 which wrap around a portion of the upper helix 1410 and a portion of the lower helix 1416 and converge over the concha bowl 1426 in a direction towards the ear canal 112 where the light source assembly 200 may be attached.
- FIGS. 17 A- 17 B illustrate yet another external support device in the form of a triangular earpiece 1700 .
- the triangular earpiece 1700 includes three vertices 1710 , 1720 , and 1730 that may be inserted within the folds of the upper helix 1410 , the lower helix 1416 , and behind the tragus 1420 of the user's ear, thus enabling the triangular earpiece 1700 to be completely supported therebetween by tension.
- the light source assembly 200 is disposed at the vertex 1730 supported behind the tragus 1420 , thereby positioning the light source assembly 200 in or near the entrance of the ear canal 112 .
- the light source assembly 200 is coupled to an ear bracelet 1800 that may encircle a medial portion of the auricle 1422 , or where the external ear attaches to the user's head. During use, the portion of the ear bracelet 1800 supporting the light source assembly 200 may be pulled around the tragus 1420 such that the ear bracelet 1800 is secured in place by tension.
- the light source assembly 200 is coupled to a backside of a piercing 1900 through the tragus 1420 , such as an earring stud. Accordingly, the piercing 1900 provides a secure attachment point for the light source assembly 200 near the ear canal 112 while occupying minimal space on the user's ear.
- FIGS. 20 A- 20 B illustrate another exemplary external support device in the form of an ear cap 2000 that may function similar to a sleeve.
- the ear cap 2000 is generally configured to slide over a top portion of the auricle 1422 such that the light source assembly 200 , which may be supported within a pouch thereof, is positioned near the ear canal 112 .
- the ear cap 2000 is formed of any suitable malleable materials, including fabrics or silicone.
- the light source assembly is attached to an S-shaped ear wrap 2100 .
- a top portion of the s-shaped ear wrap 2100 hooks around a top portion of the auricle 1422 and crosses over to extend past the tragus 1420 , where the light source assembly 200 is attached and oriented towards the ear canal 112 .
- a bottom portion of the s-shaped ear wrap 2100 hooks around the bottom portion of the auricle 1422 , such as the lobule 1424 , to provide further support and stability to the s-shaped ear wrap 2100 .
- FIGS. 22 A- 22 B illustrate another exemplary external support device in the form of an ear hook assembly 2200 .
- the ear hook assembly 2200 generally includes an ear hook 2210 extending from a base 2220 that houses or couples the light source assembly 200 thereto.
- the base 222 is an earcup (e.g., earmuff cup) that rests over a portion of the ear including the entrance of the ear canal 112 , similar to the earmuffs 600 described above.
- the base 2220 is a concha device that rests within the concha bowl 1426 , similar to the concha device 1000 .
- the ear hook 2210 slides over the top portion of the auricle 1422 and rests on a backside of the ear while the base 2220 is positioned over the entrance of the ear canal 112 to stabilize the light source assembly 200 in or near the ear canal 112 .
- embodiments of the present disclosure provide improved charging and recharging systems for hearing aids implanted within or near the ear canal, such as those implanted through the tympanic membrane.
- the disclosed systems utilize photovoltaic devices that efficiently generate power for implants from artificially-produced light transmitted across the ear canal, thus eliminating the need for external implant power supplies or charging components.
- the disclosed systems provide compact and wireless light emitting devices that may be worn in or near the ear canal during recharging, thus enabling a user engage in other activities without significant impedance thereof. Accordingly, the disclosed systems enable the implantation of hearings aids that are more compact, more comfortable, and less cosmetically noticeable.
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Abstract
The present disclosure relates to charging and recharging systems for compact hearing aids, components thereof, and support devices therefor. The charging and recharging systems generally include a light emitting device, such as an aural insert having a light emitting diode, and a photovoltaic cell disposed on an implanted hearing aid. In operation, the light emitting device is positioned in or near the entrance of the ear canal and transmits light energy across the ear canal towards the implanted hearing aid. The photovoltaic cell receives the light energy and converts the light energy into stored electricity to power the hearing aid.
Description
- This application is a continuation of U.S. Nonprovisional patent application Ser. No. 17/573,833, filed Jan. 12, 2022, which is a continuation of U.S. Nonprovisional patent application Ser. No. 16/893,787, filed Jun. 5, 2020, which claims benefit of U.S. Provisional Patent Application Ser. No. 62/858,216, filed on Jun. 6, 2019, which is herein incorporated by reference in its entirety.
- Embodiments of the present disclosure generally relate to assistive hearing devices and methods for recharging thereof. More particularly, embodiments of the present disclosure are related to recharging of hearing aid implants via light emitting diode-photovoltaic systems.
- Hearing aids are well known and typically include a microphone, an amplifier, and a speaker. Typically, the microphone receives a sound wave and converts the wave into an electrical signal, the amplifier amplifies the electrical signal, and the speaker converts the amplified signal into amplified sound waves that impart vibrations to the tympanic membrane or ear drum in the ear. Traditionally, hearing aids are mounted outside the ear canal, particularly around the outer ear. The externally mounted hearing aid has the advantage of accessibility to adjust the volume of sound and change batteries. However, many users find such externally mounted hearing aids to be relatively bulky and objectionable for cosmetic and comfort reasons.
- An alternative to externally mounted hearing aids are internally mounted hearing aids disposed in an ear canal of a user. Conventional internally mounted hearing aids offer better cosmetic appearance, but have disadvantages as well. Such hearings aids are usually employed for extended periods of time and utilize microelectronic chipsets that consume large amounts of power, therefore requiring repeated replacement of batteries every few days or frequent recharging with bulky inductive charging devices. The frequent battery replacement and/or recharging requirements make internally mounted hearing aids less desirable for active people and children, resulting in a significant impact on quality life for the hearing impaired members of the population.
- Therefore, what is needed in the art are improved methods and apparatus for recharging internally mounted hearing aids.
- The present disclosure generally relates to methods and apparatus for recharging of internally mounted hearing aids, and more particularly, recharging of internally mounted hearing aid implants via light emitting diode-photovoltaic systems.
- In one embodiment, a charging system for a hearing aid implant disposed through a tympanic membrane of an ear includes one or more photovoltaic (PV) cells located on a proximal end of the hearing aid implant and one or more light sources configured to be inserted in or near an entrance of an ear canal of the ear. During operation, the one or more light sources emit a light energy receivable by the one or more PV cells to charge the hearing aid implant.
- In one embodiment, a charging system for a hearing aid implant disposed through a tympanic membrane of an ear includes one or more photovoltaic (PV) cells located on a proximal end of the hearing aid implant and a charging device configured to be inserted in or near an entrance of an ear canal of the ear. The charging device further includes one or more light sources emitting a light energy receivable by the one or more PV cells of the hearing aid implant and having a wavelength corresponding to a wavelength range of high reflectivity by one or more surfaces of the ear canal. During operation, the one or more PV cells convert the light energy into stored electricity to power the hearing aid implant
- In one embodiment, a charging system for a hearing aid implant disposed through a tympanic membrane of an ear includes one or more photovoltaic (PV) cells located on a proximal end of the hearing aid implant and a charging device configured to be inserted in or near an entrance of an ear canal of the ear. The charging device further includes one or more high spectral purity, high efficiency resonant cavity light emitting diodes (LEDs) for emitting a light energy having a wavelength corresponding to a wavelength range of high reflectivity by one or more surfaces of the ear canal. A support device is coupled to the one or more LEDs and is configured to at least partially rest external to the ear canal and secure the charging device to the ear. During operation, the one or more PV cells are configured to absorb the light energy emitted directly from the one or more LEDs as well as light energy reflected by the one or more surfaces of the ear canal and convert the light energy into stored electricity to power the implanted hearing aid.
- So that the manner in which the above recited features of the present disclosure can be understood in detail, a more particular description of the disclosure, briefly summarized above, may be had by reference to embodiments, some of which are illustrated in the appended drawings. It is to be noted, however, that the appended drawings illustrate only exemplary embodiments and are therefore not to be considered limiting of its scope, and may admit to other equally effective embodiments.
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FIG. 1 illustrates a schematic cross-sectional view of an ear having a hearing aid implanted through a tympanic membrane and a wireless charging device inserted near an entrance of the ear canal. -
FIGS. 2A-2B illustrate schematic cross-sectional views of a light source assembly of the wireless charging device ofFIG. 1 . -
FIGS. 3A-3B illustrate schematic cross-sectional views of a photovoltaic assembly of the hearing aid ofFIG. 1 . -
FIGS. 4A-4B illustrate perspective views of the hearing aid ofFIG. 1 . -
FIGS. 5A-5B illustrate an aural insert for the wireless charging device ofFIG. 1 . -
FIG. 6 illustrates an external support device for the wireless charging device ofFIG. 1 . -
FIGS. 7A-7D illustrate an external support device for the wireless charging device ofFIG. 1 . -
FIGS. 8A-8C illustrate an external support device for the wireless charging device ofFIG. 1 . -
FIG. 9 illustrates an external support device for the wireless charging device ofFIG. 1 . -
FIGS. 10A-10B illustrate external support devices for the wireless charging device ofFIG. 1 . -
FIG. 11 illustrates an external support device for the wireless charging device ofFIG. 1 . -
FIGS. 12A-12B illustrate an external support device for the wireless charging device ofFIG. 1 . -
FIGS. 13A-13B illustrate an accessory for an external support device of the wireless charging device ofFIG. 1 . -
FIGS. 14A-14B illustrate an external support device for the wireless charging device ofFIG. 1 . -
FIGS. 15A-15B illustrate an external support device for the wireless charging device ofFIG. 1 . -
FIGS. 16A-16B illustrate an external support device for the wireless charging device ofFIG. 1 . -
FIGS. 17A-17B illustrate an external support device for the wireless charging device ofFIG. 1 . -
FIGS. 18A-18B illustrate an external support device for the wireless charging device ofFIG. 1 . -
FIGS. 19A-19B illustrate an external support device for the wireless charging device ofFIG. 1 . -
FIGS. 20A-20B illustrate an external support device for the wireless charging device ofFIG. 1 . -
FIGS. 21A-21B illustrate an external support device for the wireless charging device ofFIG. 1 . -
FIGS. 22A-22B illustrate an external support device for the wireless charging device ofFIG. 1 . - To facilitate understanding, identical reference numerals have been used, where possible, to designate identical elements that are common to the figures. It is contemplated that elements and features of one embodiment may be beneficially incorporated in other embodiments without further recitation.
- The present disclosure relates to charging and recharging systems for compact hearing aids, components thereof, and support devices therefor. The charging and recharging systems generally include a light emitting device, such as an aural insert having a light emitting diode, and a photovoltaic cell disposed on an implanted hearing aid. In operation, the light emitting device is positioned in or near the entrance of the ear canal and transmits light energy across the ear canal towards the implanted hearing aid. The photovoltaic cell receives the light energy and converts the light energy into stored electricity to power the implanted hearing aid. In certain embodiments, the light emitting device further transmits one or more wireless command signals to the implanted hearing aid, which may execute commands (e.g., functions) based on the wireless command signals received from the light emitting device.
- The embodiments described herein provide exemplary configurations of implanted hearing aids contemplated by the present disclosure. However, any other suitable configurations for hearing aids that modulate the velocity or the position of the tympanic membrane, by direct or indirect modulation, are also contemplated. The embodiments that follow discuss inserting the disclosed compact hearing aids through the tympanic membrane as an example; however, the compact hearing aids are also disposable in other locations within the ear.
-
FIG. 1 is a schematic cross-sectional view of anear 100 having a hearing aid implanted through the tympanic membrane and a wireless charging device inserted into the ear canal thereof. Theear 100 includes anouter ear 110, anear canal 112 coupled to theouter ear 110, and atympanic membrane 114 disposed near a proximal end of theear canal 112 from theouter ear 110. The structure of theouter ear 110 provides a “funnel” to direct and amplify the amplitude of sound waves into theear canal 112. Anossicular chain 115, located in a middle ear and disposed on a medial side of thetympanic membrane 114 from theouter ear 110, couples and amplifies vibrations from thetympanic membrane 114 to an inner ear having a spiral structure known as thecochlea 120. Thecochlea 120 converts the vibrations into impulses to the brain. - Hearing aids, such as
hearing aid 122, of the present disclosure can be inserted through theouter ear 110 into theear canal 112 and at least partially through thetympanic membrane 114. Thehearing aid 122 generally includes a sensor, such as a microphone, and at least one eardrum stimulating member described in more detail below. Thehearing aid 122 generally receives sound waves conducted from theouter ear 110 through theear canal 112, converts the sound waves into electrical or electromagnetic signals, and converts the electrical signals into mechanical motion, which is typically called a feed-forward system. The mechanical motion is used to impact thetympanic membrane 114, and/or portions of the middle and inner ear, to vibrate theossicular chain 115, specifically themalleus 118, theincus 117, and thestapes 116. These three bones in theossicular chain 115 act as a set of levers that amplify the amplitude of the vibrations received by thetympanic membrane 114. Thestapes 116 is coupled to the entrance of a spiral structure known as thecochlea 120 that contains an inner ear fluid. The mechanical vibrations ofstapes 116 cause the fluid to develop fluid impulses that cause small hair-like cells (not shown) in thecochlea 120 to vibrate. The vibrations are transformed into electrical impulses, which are transmitted to neuro-pathways in the hearing center of the brain resulting in the perception of sound. - Because the
hearing aid 122 may be fixedly inserted through thetympanic membrane 114, one or more energy sources (e.g., batteries) thereof may be recharged with awireless charging device 142. The chargingdevice 142, like thehearing aid 122, may also be inserted through theouter ear 110 and into theear canal 112 for wireless transfer of energy to thehearing aid 122 implanted therein to power thehearing aid 122. Additionally, the chargingdevice 142 may wirelessly communicate with thehearing aid 122 and transfer one or more wireless command signals thereto. In certain embodiments, thehearing aid 122 audibly signals to the user a power level (e.g., charge state) thereof and/or the execution of the one or more commands communicated by thewireless charging device 142. For example, thehearing aid 122 may produce an audible tone for the user signaling a low-charge level, a fully-charged level, a volume level and/or adjustment, and activation and/or deactivation (e.g., power on or power off) of thehearing aid 122. - As described in more detail below, the charging
device 142 generally includes one or more light emitting components (e.g., light sources) for optically coupling with thehearing aid 122 to transfer energy thereto in the form of light. Accordingly, thehearing aid 122 generally includes one or more photovoltaic (PV) assemblies (e.g., light-receiving surfaces or cells) for receiving light emitted from the chargingdevice 142 and converting the light into electricity using semiconducting materials exhibiting the photovoltaic effect. -
FIGS. 2A-2B illustrate schematic cross-sectional views of alight source assembly 200 and alight source 210 of thewireless charging device 142, respectively. Thelight source assembly 200 is generally disposed on a distal end of thecharging device 142, which may include an earpiece or aural insert that is configured to be easily inserted into and removed from the ear canal. The ability to insert and remove thecharging device 142 from the ear canal enables charging/recharging of thecharging device 142 itself and/or cleaning thereof. During operation, thelight source assembly 200 may be disposed at a distance of about 30 cm or less from a light receiver, such as a photovoltaic cell, of thehearing aid 122. For example, upon insertion of thecharging device 142 into or near the ear canal, thelight source assembly 200 may be disposed at a distance of between about 2 mm and about 30 mm from thehearing aid 122, such as a distance of between about 10 mm and about 20 mm from thehearing aid 122. In certain embodiments, thelight source assembly 200 is disposed at a distance from thehearing aid 122 substantially equal to a length of the user's ear canal. As used herein, the term “distal” refers to a portion of the light emitting assemblies, hearing aids, or support devices closest to the cochlea when inserted into the ear canal, or a direction toward the cochlea. The term “proximal” refers to a portion of the light emitting assemblies or hearing aids furthest to the cochlea when inserted into the ear canal, or a direction away from the cochlea. - As depicted in
FIG. 2A , thelight source assembly 200 includes at least onelight source 210 disposed on a light-reflective substrate holder 220 and encapsulated within anencapsulant 230. In certain embodiments, a plurality oflight sources 210 are arranged in one or more arrays on the light-reflective substrate holder 220 and are encapsulated within theencapsulant 230. During operation, thesubstrate holder 220 reflects any radially- and/or proximally-emitted light from thelight sources 210 in a distal direction through theencapsulant 230, thus enabling maximum light delivery to thehearing aid 122 within the ear canal. Accordingly, thesubstrate holder 220 may be formed of thin reflective films of aluminum, silver, chromium, and other suitable metals having a cup-like morphology around eachlight source 210. In certain embodiments, thesubstrate holder 220 is formed of multiple layers of materials with differing optical properties, such as titanium dioxide and silicon dioxide, to form a Bragg mirror structure. Theencapsulant 230 is formed of any suitable optically-clear materials including, but not limited to, epoxy and polyurethane resins, for protecting thelight source 210 while also enabling transmission of light therefrom. Thelight source assembly 200 further includes twoterminals encapsulant 230 and electrically coupled with the at least onelight source 210. Theterminals light sources 210 to turn thelight sources 210 on. - In certain embodiments, the
light source assembly 200 also includes one or more secondary optics, such as alens 260, to manipulate light emission distribution of thelight sources 210. Generally, thelens 260 focuses or collimates light from the one or morelight sources 210 in the distal direction to improve light delivery to thehearing aid 122. In certain embodiments, thelens 260 creates a light field having a diameter of approximately 1 cm or greater to illuminate the entire ear canal, thus ensuring that thehearing aid 122 is within a propagation path of thelight source assembly 200. In certain embodiments, thelens 260 is configured to focus the emitted light on a focal plane disposed at a distance from thelight source assembly 200 between about 1 mm and about 30 mm, such as between about 5 mm and about 25 mm, such as between about 10 mm and about 20 mm, such as about 15 mm. To accommodate for patient-to-patient variation of ear canal length, the light-propagating properties of thelens 260 may be adjustable. - Each
light source 210 generally emits incoherent light having a wavelength corresponding to the wavelength range of high light reflectivity by the tympanic membrane and other surfaces within the ear canal, thus enabling multiple reflections and optimal capture of indirect scattered light by thehearing aid 122. For example, thelight sources 210 may include light emitting diodes (LED) configured to emit light having a wavelength in the range from about 400 nm to about 1100 nm, such as a wavelength in the range from about 400 nm to about 870 nm, such as a wavelength of about 800 nm. In certain embodiments, thelight sources 210 include narrow wavelength light sources, such as a GaxAl(1-x)As-type LEDs, where x is between about 0.5 and about 1. In certain other embodiments, thelight sources 210 include multiple wavelength light sources, such as a white light LEDs. It is further contemplated that a peak wavelength of thelight sources 210 is generally between about 25 nm and 75 nm less than a peak absorptivity of receiving PV cells of thehearing aid 122. For example, the peak wavelength of thelight sources 210 may be about 50 nm less than a peak absorptivity of the PV cells of thehearing aid 122. - Although described above as being LEDs, the
light sources 210 of thelight source assembly 200 may include any suitable types of light sources for illuminating the PV assembly of thehearing aid 122 while also having a low power density to avoid uncomfortable heating of the patient's ear canal. For example, the light sources may have a maximum power dissipation of about 120 mW or less. Other suitable types of light sources include incandescent light and coherent light sources, such as laser-based light sources. - An exemplary structure of an LED-
type light source 210 is depicted inFIG. 2B . Thelight source 210 depicted inFIG. 2B is a high spectral purity, high efficiency resonant cavity LED (RCLED) and comprises anactive region 276 disposed between a plurality of n-type semiconductor layers 270 and a plurality of p-type semiconductor layers 280, thus forming a double heterostructure. The heterostructure of the LED-type light source 210 is stacked between an n+ (very heavily doped n-type)substrate 290 and ap+ GaAs layer 292 adjacent ametal contact 294 for coupling withterminals active region 276 includes one or more multiquantum well layers formed of GaInP, AlGaAs, and/or Al(1-x)GaxInP to trap injected charge carriers therein and improve recombination of electrons and holes for photon emission. To improve confinement of charge carriers within theactive region 276, the pluralities oflayers active region 276 and formed of GaAs. In certain embodiments, the pluralities oflayers light source 210. Although not depicted, it is further contemplated that thelight source 210 may also be a surface mounted device LED (SMD LED) having an LED chip with a phosphor layer disposed in a flat top lens mounted on a printed circuit board (PCB). Furthermore, although exemplary embodiments of thelight source 210 are described with reference toFIG. 2B , those skilled in the art will understand that thelight source 210 may be optimized by tailoring the composition and structure of the various components and/or layers thereof. -
FIGS. 3A-3B illustrate schematic cross-sectional views of a photovoltaic (PV)assembly 300 and aPV cell 310 of thehearing aid 122, respectively. ThePV assembly 300 is generally disposed on a proximal portion of thehearing aid 122 within the ear canal for optical coupling with the chargingdevice 142 while avoiding interference with the sound detection and amplification functions of thehearing aid 122. As depicted inFIG. 3A , the PV assembly generally includes at least onePV cell 310 that electrically couples with a power input of thehearing aid 122 via positive andnegative leads PV assembly 300 includes a plurality ofPV cells 310 arranged in one or more arrays. For example, a plurality ofPV cells 310 may be partitioned and isolated such that they can be connected in a serial configuration for higher voltage output, thus eliminating the need for DC-DC converters and eliminating related DC-DC up-conversion losses. - Generally, each
PV cell 310 is a single or multi-junction (e.g., double junction, triple junction) semiconductor device configured to absorb the energy of light produced by the chargingdevice 142 and convert it directly into electricity to power thehearing aid 122. Utilization of multiple junctions may increase the energy absorption and/or conversion properties of thePV cells 310. In certain embodiments, the output voltage of a single junction GaAs PV is between about 0.2V and about 0.9V, and the output power is between about 10 mW and about 80 mW, depending on current density. ThePV cells 310 may be optimized for absorption of either broad or narrow wavelength light, such as achromatic or monochromatic light. In certain embodiments, thePV cells 310 absorb light energy emitted by the chargingdevice 142 that is reflected off the skin within the ear canal. For example, thelight sources 210 and thePV cells 310 may emit and absorb light having a wavelength corresponding to optimal skin reflectivity, such as about 800 nm. At 800 nm, surfaces within the ear canal, such as those of the tympanic membrane, have a high reflectance (0.8), low absorbance (0.1), and low transmittance (0.1), thus enabling optimum transmission of light energy within the ear canal. - An exemplary structure of a
PV cell 310 is depicted inFIG. 3B according to embodiments of this disclosure. As shown, thePV cell 310 is a GaAs-based PV cell formed on a thinnedN+ GaAs substrate 390, thus having a reduced mass and profile. An n-typeBragg reflector layer 370, an n-type base layer 372, a thin p-type emitter layer 382, and a p-type window layer 384 are stacked above thesubstrate 390. Like thesubstrate 390, thebase layer 372 and the emitter layer 782 may be formed of GaAs, while the window layer 784 is formed of Al1-xGaAs. In certain embodiments, thePV cell 310 further includes a p+GaAs capping layer 386 formed on the window layer 784. Generally, the bandgaps of the active layers of thePV cell 310 are matched closely with the bandgaps of the active layers of thelight sources 210 for optimal energy transfer therebetween. Although exemplary embodiments of thePV cell 310 are described with reference toFIG. 3B , those skilled in the art will understand that thePV cell 310 may be optimized by tailoring the composition and structure of the various components or layers thereof. - As described above, the
PV assembly 300 is generally disposed on a proximal portion of thehearing aid 122 within the ear canal and in an arrangement that avoids interference with the sound detection and amplification functions of thehearing aid 122.FIGS. 4A and 4B illustrate exemplary arrangements ofPV assemblies 300 on thehearing aid 122 in accordance with embodiments of the present disclosure. In the embodiment depicted inFIG. 4A , thehearing aid 122 includes aproximal end 410 comprised of at least two oblique and convergingsurfaces hearing aid 122, thus forming a wedge-like shape. In certain embodiments, the oblique surfaces 420 a and 420 b may be disposed at substantially equal angles relative to the major axis A. In certain other embodiments, the oblique surfaces 420 a and 420 b may be disposed at substantially different angles relative to the major axis A. Generally, amicrophone 430 or other sound detecting device is disposed on thefirst oblique surface 420 a, while one ormore PV assemblies 300 are disposed on thesecond oblique surface 420 b. Due to the sloped nature of the oblique surfaces 420 a and 420 b, both themicrophone 430 and thePV assemblies 300 may be aligned to receive direct and indirect (e.g., reflected) acoustic and light energy from the ear canal. - In the alternative embodiment depicted in
FIG. 4B , theproximal end 410 of thehearing aid 122 is substantially cylindrical in shape and has aproximal face 440 substantially perpendicular to the major axis A of thehearing aid 122. Either themicrophone 430 or the one ormore PV assemblies 300 may be disposed on the proximal face 440 (microphone 430 is shown inFIG. 4 b ), while the other is disposed along thecircumferential surface 450 about thehearing aid 122. Thus, either themicrophone 430 or thePV assemblies 300 may receive direct acoustic or light energy, while the other receives indirect acoustic or light energy reflected by the surfaces of the ear canal. As previously described, the one ormore PV cells 310 of thePV assemblies 300 may absorb light energy emitted by chargingdevice 142 that is reflected off the skin within the ear canal, such as light having a wavelength of about 800 nm. - In addition to transmitting light energy, the charging
device 142 may further be configured to wirelessly transmit one or more types of communication signals to thehearing aid 122 for wireless communication between the chargingdevice 142 and thehearing aid 122. In certain embodiments, thehearing aid 122 may be configured to send a modulated signal to thehearing aid 122 for relaying desired commands thereto. Examples of commands that may be communicated between the chargingdevice 142 and thehearing aid 122 include commands to power on and power off thehearing aid 122, or increase and lower the volume thereof. - The present disclosure further contemplates the
charging device 142 comprising an aural insert or external support device for securing thelight source assembly 200 within or near the ear canal. Generally, during recharging of thehearing aid 122, it is desired that the light source assembly 200 (and thus, the one or more light sources 210) be secured in close proximity to and oriented towards the one ormore PV assemblies 300 of thehearing aid 122. -
FIGS. 5A-5B illustrate an exemplaryaural insert 500 for positioning thelight source assembly 200 near thetympanic membrane 114 to provide a direct, clear line of site from thelight source assembly 200 to thehearing aid 122. In certain embodiments, thelight source assembly 200 is coupled to adistal end 510 of theaural insert 500 which is inserted into the user'sear canal 112, while aproximal end 520 is configured to rest on the concha bowl, the intertragic notch, behind the tragus, or about the entrance of theear canal 112. In certain embodiments, theproximal end 520 further provide a port for connection to a power source to charge thecharging device 142. Thedistal end 510 is shaped to fit within and traverse at least a portion of the user'sear canal 112, such as between about ½ and about ⅔ of the length of theear canal 112, to ensure that light from thelight source assembly 200 is not impeded by anatomical features or tortuosity of theear canal 112. Furthermore, theaural insert 500 may have a channel formed through a length thereof (e.g., from a proximal to distal end of the aural insert 500) so as to not impede hearing of the user while wearing theaural insert 500. - In certain embodiments, the
aural insert 500 is custom-profiled via ear impression or 3D imaging to match the shape of a specific user'sear canal 112, thus enabling a custom and secure fit. In such embodiments, theaural insert 500 may be formed of relatively rigid materials, such as acrylates and/or methacrylates. In certain other embodiments, theaural insert 500 has a universal fit and does not require custom profiling, and is thus formed of suitable malleable or flexible materials to conform to the tortuosity and length of theear canal 112. Examples of suitable malleable materials include polymers such as rubber and silicone, polyurethane, foam, advanced plastics, and the like. In certain examples, theaural insert 500 may be compressed by the user prior to insertion within theear canal 112, after which theaural insert 500 may decompress to fill theear canal 112. In certain embodiments, theaural insert 500 is formed of an optically transparent or translucent material to enable transmission of light therethrough. - In addition to the
aural insert 500, the present disclosure also contemplates thecharging device 142 comprising other types of external support devices for securing or mounting thelight source assembly 200 within or near the ear canal. The external support devices are generally disposed near the ear canal, over the ear, around the ear, or in the vicinity of the user's head. Exemplary external support devices include ear buds, earmuffs, over-the-ear clips, glasses stem clips, headbands, and devices in or around the vicinity of the user's head that can be placed near the ear canal, over the ear, around the ear, or in the vicinity of the user's head to enable interaction between thelight source assembly 200 and thePV assemblies 300 of thehearing aid 122. -
FIG. 6 illustrates one such external support device in the form ofearmuffs 600 for securing and stabilizing alight source assembly 200 in or near the ear canal of a user. As shown, theearmuffs 600 include aheadband 610 coupled to twoear cups 620 at opposing ends thereof, wherein at least oneear cup 620 has alight source assembly 200 disposed therein. When worn, the ear cups 620 are placed over the external ear (e.g., over the concha bowl) of the user, thus positioning thelight source assembly 200 near the entrance of the user's ear canal for recharging of thehearing aid 122. In certain embodiments, thelight source assembly 200 may be disposed within aremovable pod 640 for easy insertion and removal from theearmuffs 600. Theearmuffs 600 also include aUSB port 630 for USB charging of theearmuffs 600. -
FIGS. 7A-7D illustrate another exemplary external support device in the form of aheadband 700. Theheadband 700 includes at least onepouch 710 disposed on an internal or external side thereof for securing alight source assembly 200 near a user's ear canal when worn over the external ear of the user. Like with theearmuffs 600, thepouch 710 may be configured to receive thelight source assembly 200 within apod 640 for easy insertion and removal therefrom. Theheadband 700 is generally formed of any suitable materials, including fabrics or polymeric materials such as silicone for user comfort. In certain embodiments, theheadband 700 is a standalone device. In certain other embodiments, theheadband 700 is further integrated with another piece of headwear, such as a hat orskullcap 720, to be worn by the user during use of thecharging device 142. -
FIGS. 8A-8C illustrate exemplary eyeglass stem clips 800 for securing thelight source assembly 200 in or near the ear canal of a user. As depicted, the eyeglass stem clips 800 may slide over or attach to (e.g., clip to) the stems 820 of a pair ofeyeglasses 810 during use thereof. When not being utilized, the eyeglass stem clips 800 may be removed from theeyeglasses 810 and coupled with a chargingdock 830 having aUSB port 840 for charging/recharging thereof. The eyeglass stem clips 800 are generally formed of any suitable materials, including polymeric materials such as silicone. - As an alternative to the eyeglass stem clips 800,
FIG. 9 illustrates anexemplary eyeglass frame 900 having alight source assembly 200 integrated therewith. As shown, one or both stems 920 of theeyeglass frame 900 has aprotrusion 930 extending therefrom and configured to receive alight source assembly 200. When worn, theprotrusion 930 extends over the ear and positions thelight source assembly 200 in or near the user's ear canal. Like theearmuffs 600, theeyeglass frame 900 may have a USB port for USB charging/recharging of theeyeglass frame 900 when not in use. -
FIGS. 10A-10B illustrateexemplary concha devices light source assembly 200 in or near the ear canal while substantially resting within the concha bowl (e.g., cavum concha) of the user's ear. Generally, theconcha devices base 1010 coupled to a fitting 1020.Concha device 1001 further includes astem 1030 for easier handling by a user. The base 1010 houses thelight source assembly 200 and any corresponding circuitry and rests external to the ear canal during use, while the fitting 1020 is configured to fit into the ear canal and secure (e.g., anchor) the device to the user's ear. Similar to theaural insert 500, the fitting 1020 is formed of any suitable malleable or flexible material to conform to the tortuosity of the ear canal, including polymers such as rubber and silicone, polyurethane, foam, and/or advanced plastics. Accordingly, the fitting 1020 may be compressed by the user prior to insertion within the ear canal, after which the fitting 1020 may decompress to fill the ear canal. In certain embodiments, the material of the fitting 1020 is optically transparent or translucent to enable transmission of light therethrough. In certain embodiments, the fitting 1020 has a cavity or channel formed therein to enable transmission of light from thelight source assembly 200 to thehearing aid 122. -
FIGS. 11, 12A-12B, and 13A-13B illustrate additional components that may be utilized in combination with theconcha devices FIG. 11 , theconcha device 1000 removably couples to stems 1110 of aheadband 1100, which may further include aUSB port 1120 for USB charging/recharging of theheadband 1100 and/orconcha device 1000. Theheadband 1100 provides additional support for securing theconcha device 1000 within the concha bowl during use thereof. As depicted inFIGS. 12A-12B , either of theconcha devices neckband 1200 bycables 1210. Theneckband 1200 is shaped to be supported upon a user's neck by tension, and provides an anchoring point for theconcha devices FIGS. 13A-13B depict a portable andmodular charging unit 1300 for theconcha device 1000. Thecharging unit 1300 includes acharging base 1310 havingUSB port 1320 for USB charging/recharging of one ormore concha devices 1000. During use, theconcha devices 1000 may anchor to opposing sides of thecharging base 1310 by any suitable means, including mechanical or magnetic mechanisms. In certain embodiments, thecharging unit 1300 also includes one ormore caps 1330 that attach to thecharging base 1310 or theconcha devices 1000 themselves and cover theconcha devices 1000 when anchored to thebase 1310. In certain embodiments, the one ormore caps 1330 are further coupled to akeychain 1340 or other tethering device for attachment to other devices. -
FIGS. 14A-14B, 15A-15B, and 16A-16B illustrate further examples of external support devices for securing thelight source assembly 200 in or near the ear canal of a user. InFIGS. 14A-14B, 15A-15B, and 16A-16B , thelight source assembly 200 is coupled to distal ends ofear cuffs ear cuff 1400 encircles theupper helix 1410 of the ear and extends down past thecrus 1412 of the helix to the entrance of theear canal 112, where it secures thelight source assembly 200. Theear cuff 1500, on the other hand, wraps around a portion of thelower helix 1416 and extends therefrom to the entrance of the ear canal 1214, thus extending past thelower antihelix 1418 and theconcha bowl 1426. Alternatively, theear cuff 1600 includes twoarms 1610 which wrap around a portion of theupper helix 1410 and a portion of thelower helix 1416 and converge over theconcha bowl 1426 in a direction towards theear canal 112 where thelight source assembly 200 may be attached. -
FIGS. 17A-17B illustrate yet another external support device in the form of atriangular earpiece 1700. Thetriangular earpiece 1700 includes threevertices upper helix 1410, thelower helix 1416, and behind thetragus 1420 of the user's ear, thus enabling thetriangular earpiece 1700 to be completely supported therebetween by tension. As depicted, thelight source assembly 200 is disposed at the vertex 1730 supported behind thetragus 1420, thereby positioning thelight source assembly 200 in or near the entrance of theear canal 112. - In
FIGS. 18A-18B , thelight source assembly 200 is coupled to anear bracelet 1800 that may encircle a medial portion of theauricle 1422, or where the external ear attaches to the user's head. During use, the portion of theear bracelet 1800 supporting thelight source assembly 200 may be pulled around thetragus 1420 such that theear bracelet 1800 is secured in place by tension. InFIGS. 19A-19B , thelight source assembly 200 is coupled to a backside of a piercing 1900 through thetragus 1420, such as an earring stud. Accordingly, the piercing 1900 provides a secure attachment point for thelight source assembly 200 near theear canal 112 while occupying minimal space on the user's ear. -
FIGS. 20A-20B illustrate another exemplary external support device in the form of anear cap 2000 that may function similar to a sleeve. Theear cap 2000 is generally configured to slide over a top portion of theauricle 1422 such that thelight source assembly 200, which may be supported within a pouch thereof, is positioned near theear canal 112. Theear cap 2000 is formed of any suitable malleable materials, including fabrics or silicone. - In
FIGS. 21A-21B , the light source assembly is attached to an S-shapedear wrap 2100. A top portion of the s-shapedear wrap 2100 hooks around a top portion of theauricle 1422 and crosses over to extend past thetragus 1420, where thelight source assembly 200 is attached and oriented towards theear canal 112. Similar to the top portion thereof, a bottom portion of the s-shapedear wrap 2100 hooks around the bottom portion of theauricle 1422, such as thelobule 1424, to provide further support and stability to the s-shapedear wrap 2100. -
FIGS. 22A-22B illustrate another exemplary external support device in the form of anear hook assembly 2200. Theear hook assembly 2200 generally includes anear hook 2210 extending from abase 2220 that houses or couples thelight source assembly 200 thereto. In certain embodiments, the base 222 is an earcup (e.g., earmuff cup) that rests over a portion of the ear including the entrance of theear canal 112, similar to theearmuffs 600 described above. In certain other embodiments, thebase 2220 is a concha device that rests within theconcha bowl 1426, similar to theconcha device 1000. During operation, theear hook 2210 slides over the top portion of theauricle 1422 and rests on a backside of the ear while thebase 2220 is positioned over the entrance of theear canal 112 to stabilize thelight source assembly 200 in or near theear canal 112. - In summary, embodiments of the present disclosure provide improved charging and recharging systems for hearing aids implanted within or near the ear canal, such as those implanted through the tympanic membrane. The disclosed systems utilize photovoltaic devices that efficiently generate power for implants from artificially-produced light transmitted across the ear canal, thus eliminating the need for external implant power supplies or charging components. Moreover, the disclosed systems provide compact and wireless light emitting devices that may be worn in or near the ear canal during recharging, thus enabling a user engage in other activities without significant impedance thereof. Accordingly, the disclosed systems enable the implantation of hearings aids that are more compact, more comfortable, and less cosmetically noticeable.
- While the foregoing is directed to embodiments of the present disclosure, other and further embodiments of the disclosure may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow.
Claims (21)
1-20. (canceled)
21. A hearing aid system, comprising:
a hearing aid configured to be disposed through a tympanic membrane of an ear, the hearing aid comprising:
a first end comprising an energy-receiving surface, the energy-receiving surface configured to convert received energy into stored electricity for powering the hearing aid; and
a rechargeable energy source.
22. The hearing aid system of claim 21 , wherein the received energy comprises light energy.
23. The hearing aid system of claim 22 , wherein the light energy comprises light having a wavelength between about 400 nm and about 1100 nm.
24. The hearing aid system of claim 23 , wherein the light energy comprises light having a wavelength between about 400 nm and about 870 nm.
25. The hearing aid system of claim 22 , wherein the energy-receiving surface comprises a photovoltaic (PV) cell.
26. The hearing aid system of claim 21 , further comprising:
a charging device configured to be inserted near an entrance of an ear canal of the ear, the charging device comprising an energy source configured to emit energy receivable by the energy-receiving surface to recharge the rechargeable energy source.
27. The hearing aid system of claim 26 , wherein the charging device is further configured to transmit command signals for controlling one or more aspects of the hearing aid.
28. The hearing aid system of claim 26 , wherein the energy comprises light energy, and wherein the charging device comprise a light source.
29. The hearing aid system of claim 28 , wherein the light source comprises a light emitting diode (LED).
30. The hearing aid system of claim 28 , wherein the light source comprises a coherent light source.
31. The hearing aid system of claim 30 , wherein the light source comprises a laser light source.
32. The hearing aid system of claim 21 , wherein the first end further comprises a microphone configured to receive and convert sound energy into electrical signals for stimulating the tympanic membrane of the ear.
33. The hearing aid system of claim 21 , wherein the rechargeable energy source comprises a battery.
34. A hearing aid system, comprising:
a hearing aid configured to be disposed through a tympanic membrane of an ear, the hearing aid comprising:
a first end comprising a light-receiving surface, the light-receiving surface configured to convert received light energy into stored electricity for powering the hearing aid; and
a rechargeable battery.
35. The hearing aid system of claim 34 , wherein the light-receiving surface comprises a photovoltaic (PV) cell.
36. The hearing aid system of claim 34 , further comprising:
a charging device configured to be inserted near an entrance of an ear canal of the ear, the charging device comprising a light source configured to emit light energy receivable by the light-receiving surface to recharge the rechargeable battery.
37. The hearing aid system of claim 36 , wherein the charging device is further configured to transmit command signals for controlling one or more aspects of the hearing aid.
38. The hearing aid system of claim 36 , wherein the light source comprises a light emitting diode (LED) or laser light source.
39. The hearing aid system of claim 34 , wherein the first end further comprises a microphone configured to receive and convert sound energy into electrical signals for stimulating the tympanic membrane of the ear.
40. A hearing aid system, comprising:
a hearing aid configured to be disposed through a tympanic membrane of an ear, the hearing aid comprising:
a first end comprising a light-receiving cell and a microphone, the light-receiving cell configured to convert received light energy into stored electricity for powering the hearing aid, the microphone configured to receive and convert sound energy into electrical signals for stimulating the tympanic membrane of the ear; and
a rechargeable battery; and
a charging device configured to be inserted near an entrance of an ear canal of the ear, the charging device comprising a light source configured to emit light energy receivable by the light-receiving cell to recharge the rechargeable battery.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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US18/240,272 US20230421975A1 (en) | 2019-06-06 | 2023-08-30 | Hearing aid implant recharging system |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
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US201962858216P | 2019-06-06 | 2019-06-06 | |
US16/893,787 US11259131B2 (en) | 2019-06-06 | 2020-06-05 | Hearing aid implant recharging system |
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WO2020247726A1 (en) * | 2019-06-06 | 2020-12-10 | Nanoear Corporation, Inc. | Hearing aid implant recharging system |
US11665464B2 (en) * | 2020-06-15 | 2023-05-30 | Synaps Llc | Device for securing cochlear implant external transmitter |
US11805352B2 (en) * | 2021-05-28 | 2023-10-31 | Plantronics, Inc. | Wireless charging dock |
JPWO2023084578A1 (en) * | 2021-11-09 | 2023-05-19 | ||
WO2023084576A1 (en) * | 2021-11-09 | 2023-05-19 | 日本電信電話株式会社 | Audio signal output device |
CN116365726A (en) * | 2023-03-21 | 2023-06-30 | 北京工业大学 | Implanted wireless power supply system based on infrared photovoltaic battery |
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