Optically based totally implantable cochlear implant device

Abstract

This invention provides an optically-based fully implantable cochlear implant device, comprising: an optical sensing module for emitting a light source and receiving light signals reflected back from a sound vibration module; a photoelectric conversion module for converting the received light signals into alternating current (AC) signals; a sound processing module for processing sound information and converting the AC signals into direct current (DC) signals; a decoding stimulation module for decoding sound information and converting the DC signals into pulse signals; cochlear stimulation electrodes for performing auditory nerve electrical stimulation based on the pulse signals; and an implantable power supply module for supplying power. This invention utilizes non-contact optical sound sensing technology, which does not affect the stability of the tympanic membrane and ossicles, avoiding the risk that even slight displacement after long-term implantation can affect hearing. It improves the long-term reliability and stability of the acoustic sensors, thereby extending the overall lifespan of the fully implantable cochlear implant.

Description

Technical Field

[0001] This invention belongs to the technical field of cochlear implants, and in particular relates to an optically based fully implantable cochlear implant device. Background Technology

[0002] Cochlear implants are among the most successfully used neural prostheses in the world, suitable for hearing restoration and reconstruction in patients with severe or profound sensorineural hearing loss. The cochlear implant uses an external sound processor's microphone to collect external sound information, which is then transmitted wirelessly to a decoder / stimulator inside the body. This information is converted into electrical signals that bypass damaged hair cells and directly stimulate the auditory nerve, achieving the clinical effect of hearing reconstruction. However, external sound processors are easily lost during use, and wearing them externally compromises patient privacy, potentially causing stigma and severely impacting hearing reconstruction effectiveness and mental health. Furthermore, external sound processors rely on battery power, often requiring removal and safekeeping during activities such as bathing, swimming, and sleeping, limiting the user's usage scenarios and activity range. Domestic and international experts have proposed the concept of a fully implantable cochlear implant, integrating all functional components into the body. From the patient's perspective, it appears identical to a normal person, helping to increase patient confidence in hearing implantation, protect patient privacy, ensure 24 / 7 use, expand the usage scenarios, and benefit more patients with severe and profound sensorineural hearing loss.

[0003] Currently, the mainstream approaches to sound acquisition in fully implantable cochlear implants fall into two main categories. One is the electret microphone, which senses sound vibrations through a diaphragm. The diaphragm generates regular electrical signals as it shifts. A typical application involves fixing the microphone to the outside of the skull and implanting it under the skin to collect external sounds. However, this method has several drawbacks: sound transmission through the skin causes significant attenuation, limiting the signal-to-noise ratio, and it also generates considerable background noise interference. Furthermore, the microphone's shock resistance and the consistency of the diaphragm after long-term implantation must be considered. The other approach is the piezoelectric microphone, which directly converts the pressure transmitted to the diaphragm / piezoelectric element into electrical energy using the piezoelectric effect. A typical application involves a needle-shaped pressure probe collecting vibrations of the ossicles or tympanic membrane in the middle ear. Based on different frequency amplitudes, these vibrations are converted into electrical signals. While this method can significantly reduce the impact of ambient noise and utilize the natural amplification function of the auricle and ear canal, it still has disadvantages. Specifically, because the ossicles vibrate at different frequencies and have a very smooth surface, long-term implantation poses significant challenges to the stability of the ossicles and the consistency of the sensor probe's position. Displacement can lead to hearing loss. Summary of the Invention

[0004] In view of the shortcomings of the prior art described above, the purpose of this invention is to provide an optically based fully implantable cochlear implant device to solve the problems of human noise interference and sensor displacement leading to decreased hearing performance in the prior art.

[0005] In a first aspect, the present invention provides an optically based, fully implantable cochlear implant device, comprising:

[0006] An optical sensing module includes a light generator and a photodetector. The optical sensing module is used to emit a light source and receive light signals reflected back from a sound vibration module. The sound vibration module includes a tympanic membrane or ossicles connected to the auditory conduction pathway structure.

[0007] The photoelectric conversion module, which is optically connected to the optical sensing module, includes a photoelectric adapter and an integrated printed circuit board. The photoelectric conversion module is used to convert the received optical signal into an alternating current signal.

[0008] A sound processing module electrically connected to the photoelectric conversion module, the sound processing module including an analog-to-digital conversion unit and a signal processing unit, the sound processing module being used to process sound information and convert the AC signal into a DC signal;

[0009] A decoding stimulation module electrically connected to the sound processing module, the decoding stimulation module including a decoding stimulation chip and a decoding stimulation circuit, the decoding stimulation module being used to decode sound information and convert the DC signal into a pulse signal;

[0010] Cochlear stimulation electrodes electrically connected to the decoding stimulation module, the cochlear stimulation electrodes being used for auditory nerve electrical stimulation based on pulse signals; and

[0011] An implantable power module is provided, comprising a rechargeable battery, a charging coil, and a charging / discharging circuit. The implantable power module is electrically connected to the photoelectric conversion module, the sound processing module, and the decoding stimulation module, respectively, for supplying power.

[0012] In one possible implementation of this application, the sound vibration module further includes a reflective material fixed to the tympanic membrane or the ossicles, wherein the reflective material is made of at least barium titanate glass.

[0013] In one possible implementation of this application, the light generator is used to emit a light source of a specified wavelength to the sound vibration module, and the photodetector is used to receive the light signal reflected back by the sound vibration module based on the light source of the specified wavelength.

[0014] In one possible implementation of this application, the optoelectronic interface is used to connect the optical fiber to the integrated circuit components on the integrated printed circuit board, and the integrated circuit on the integrated printed circuit board is used to convert the optical signal into an AC signal.

[0015] In one possible implementation of this application, the analog-to-digital conversion unit is used to convert the AC signal into a DC signal, and the signal processing unit includes a DSP chip and a processing chip, wherein the signal processing unit is used to process the DC signal to transmit it to the decoding stimulation module.

[0016] In one possible implementation of this application, the charging and discharging circuit includes a charging processing unit and a digital-to-analog converter unit. The digital-to-analog converter unit is used to convert the DC power of the rechargeable battery into AC power for power supply. When the external charger wirelessly transmits energy to the charging coil, the charging processing unit is used to process the energy acquired by the charging coil to charge the rechargeable battery.

[0017] In one possible implementation of this application, the cochlear stimulation electrode includes a plurality of electrode contacts, wherein the material of the electrode contacts includes at least pure platinum or a platinum-iridium alloy.

[0018] In one possible implementation of this application, the photoelectric conversion module, the sound processing module, the decoding stimulation module, and the implanted power module are encapsulated in a preset housing, wherein the photoelectric conversion module, the sound processing module, and the decoding stimulation module are integrated into one unit, and the material of the housing includes at least titanium.

[0019] In one possible implementation of this application, the optical sensing module is encapsulated in implantable silicone, and the cochlear stimulation electrode is wrapped in implantable silicone.

[0020] In one possible implementation of this application, the device further includes a calibration module, which includes an external microphone and a wireless transmission unit, and is used to calibrate the sound information received by the sound processing module.

[0021] As described above, the optically-based fully implantable cochlear implant device of this invention detects the vibration of the tympanic membrane or ossicles inside the middle ear through non-contact sound sensing technology. Unlike other fully implantable cochlear implant solutions, the optical sensing module in this application can preserve the entire ossicular chain, including the external auditory canal and its resonant amplification effect, to the greatest extent possible. This is beneficial for improving the signal-to-noise ratio and sound source localization ability, and is more in line with the human body's own auditory habits, thus having the following beneficial effects:

[0022] (1) The optical sound sensing module is fixed in the middle ear, which can greatly reduce the interference of the human body's own background noise, and there is no need to consider the impact protection performance in extreme scenarios.

[0023] (2) Compared with traditional piezoelectric sensors, non-contact optical sound sensing technology does not affect the stability of the human eardrum and ossicles, avoids the risk that slight displacement after long-term implantation will affect hearing, improves the long-term reliability and stability of acoustic sensors, and thus extends the overall lifespan of fully implantable cochlear implants, providing the best solution. Attached Figure Description

[0024] Figure 1 The diagram shown is a structural schematic of an embodiment of the optically based fully implantable cochlear implant device of the present invention.

[0025] Figure 2 The diagram shown is a structural schematic of an embodiment of the optically based fully implantable cochlear implant device of the present invention.

[0026] Figure 3 The diagram shown is a structural schematic of an embodiment of the optically based fully implantable cochlear implant device of the present invention.

[0027] Figure 4 The diagram shown is a structural schematic of an embodiment of the optically based fully implantable cochlear implant device of the present invention.

[0028] Figure 5 The diagram shown is a structural schematic of an embodiment of the optically based fully implantable cochlear implant device of the present invention.

[0029] Figure 6 The diagram shown is a structural schematic of an embodiment of the optically based fully implantable cochlear implant device of the present invention.

[0030] Figure 7 The diagram shown is a structural schematic of an embodiment of the optically based fully implantable cochlear implant device of the present invention.

[0031] Component designation explanation

[0032] 1 Sound vibration module

[0033] 11 Tympanic membrane

[0034] 12 Listen to Xiao Gu

[0035] 13 Reflective materials

[0036] 2 Optical Sensing Module

[0037] 21 Light Generator

[0038] 22 Photodetectors

[0039] 3. Photoelectric conversion module

[0040] 31 Optical-to-electrical adapter

[0041] 32 Integrated Printed Circuit Boards

[0042] 4. Sound Processing Module

[0043] 41 Analog-to-Digital Conversion Unit

[0044] 42 Signal Processing Unit

[0045] 421 DSP chip

[0046] 422 Processing Chip

[0047] 5 Decoding Stimulation Module

[0048] 51 Decoding Stimulation Chip

[0049] 52 Decoding Stimulation Circuit

[0050] 6 Cochlear stimulation electrodes

[0051] 7. Implant power module

[0052] 71 Rechargeable batteries

[0053] 72 Charging coil

[0054] 73 Charging and discharging circuit

[0055] 731 Charging Processing Unit

[0056] 732 Digital-to-Analog Converter Unit

[0057] 8 Calibration Module

[0058] 81 External Microphone

[0059] 82 Wireless Transmission Units Detailed Implementation

[0060] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that, unless otherwise specified, the following embodiments and features described therein can be combined with each other.

[0061] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Therefore, the drawings only show the components related to the present invention and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0062] The technical solutions of the present invention will now be described in detail with reference to the accompanying drawings.

[0063] Specifically, in one embodiment of the invention, the optically-based fully implantable cochlear implant device of the present invention includes:

[0064] An optical sensing module includes a light generator and a photodetector. The optical sensing module is used to emit a light source and receive light signals reflected back from a sound vibration module. The sound vibration module includes a tympanic membrane or ossicles connected to the auditory conduction pathway structure.

[0065] The photoelectric conversion module, which is optically connected to the optical sensing module, includes a photoelectric adapter and an integrated printed circuit board. The photoelectric conversion module is used to convert the received optical signal into an alternating current signal.

[0066] A sound processing module electrically connected to the photoelectric conversion module, the sound processing module including an analog-to-digital conversion unit and a signal processing unit, the sound processing module being used to process sound information and convert the AC signal into a DC signal;

[0067] A decoding stimulation module electrically connected to the sound processing module, the decoding stimulation module including a decoding stimulation chip and a decoding stimulation circuit, the decoding stimulation module being used to decode sound information and convert the DC signal into a pulse signal;

[0068] Cochlear stimulation electrodes electrically connected to the decoding stimulation module, the cochlear stimulation electrodes being used for auditory nerve electrical stimulation based on pulse signals; and

[0069] An implantable power module is provided, comprising a rechargeable battery, a charging coil, and a charging / discharging circuit. The implantable power module is electrically connected to the photoelectric conversion module, the sound processing module, and the decoding stimulation module, respectively, for supplying power.

[0070] It should be noted that, in this embodiment, as Figure 1As shown, the device comprises seven modules, which, based on the signal acquisition, transmission, processing, and application process, are a sound vibration module, a photoelectric sensing module, a photoelectric conversion module, a sound processing module, a decoding stimulation module, and a cochlear stimulation electrode, as well as an implantable power supply module that supplies power to the photoelectric conversion module, the sound processing module, and the decoding stimulation module.

[0071] Furthermore, the sound vibration module and the photoelectric sensing module are connected through light reflection, while the photoelectric sensing module and the photoelectric conversion module are connected through optical fiber. Other modules are connected electrically through wires. For example, the photoelectric conversion module and the sound processing module are connected electrically through wires, as are the sound processing module and the decoding stimulation module. Correspondingly, the decoding stimulation module and the cochlear stimulation electrode are also connected electrically through wires. Since the implanted power supply module supplies power to the photoelectric conversion module, the sound processing module, and the decoding stimulation module, they are also electrically connected separately through wires.

[0072] Specifically, the working process of this device is as follows: External sound is collected and amplified by the auricle and enters the external auditory canal, causing the tympanic membrane and ossicles to vibrate. The light generator in the optical sensing module fixed in the middle ear emits a light signal. The tympanic membrane or ossicles (or a reflective material fixed on it) receives and reflects the light signal. The slight vibration of the tympanic membrane or ossicles changes the intensity and phase of the reflected light. The probe of the photodetector receives the light signal modulated with sound information, and then transmits it through optical fiber to the photoelectric conversion module. The photoelectric conversion module converts the light signal modulated with sound information into an electrical signal and transmits it to the sound processing module. Further, the sound processing module analyzes and demodulates the electrical signal to extract the sound information and transmits it to the decoding stimulation module based on a DC electrical signal. Finally, it transmits the signal to the cochlear stimulation electrode to emit a pulse electrical signal to stimulate the auditory nerve, thereby achieving the effect of hearing reconstruction.

[0073] Furthermore, in one embodiment of the invention, the sound vibration module includes a tympanic membrane or ossicles connected to the auditory conduction pathway structure, wherein the sound vibration module further includes a reflective material.

[0074] It should be noted that, in this embodiment, the auditory conduction pathway begins in the outer ear, passes through the middle ear, and ends in the inner ear, connecting with the peripheral nerve fibers of the bipolar cells in the spiral ganglion. Therefore, the acquisition of sound vibrations can be applied to the tympanic membrane or ossicles in the auditory conduction pathway structure. Since vibration causes displacement, the signal can be acquired by using light reflection. To ensure sufficient light reflection amplitude, reflective material can be added to the tympanic membrane or ossicles, i.e., the reflective material is fixed to the tympanic membrane or ossicles. In this way, even very small vibrations can be acquired by the corresponding light reflection. Accordingly, the material of the reflective material can be barium titanate glass, or any other lightweight, biocompatible, and highly reliable material.

[0075] Furthermore, in one embodiment of the invention, the light generator is used to emit a light source of a specified wavelength to the sound vibration module, and the photodetector is used to receive the light signal reflected back by the sound vibration module based on the light source of the specified wavelength.

[0076] It should be noted that the above embodiments illustrate that the connection between the sound vibration module and the photoelectric sensing module is established through light reflection. Specifically, in this embodiment, as shown... Figure 2 As shown, the photoelectric sensing module includes a light generator and a photodetector. The light generator is used to emit a light source of a specified wavelength to the sound vibration module. For example, a semiconductor laser lamp can be used to emit the specified wavelength using any material with high reliability and stability. The photodetector is used to receive the light signal reflected back by the sound vibration module based on the current specified wavelength light source. The photodetector can be composed of an optical fiber probe with a collimator. The probe part can be made of a highly corrosion-resistant material. Furthermore, in application, the entire optical sensing module is encapsulated in medical-grade implantable silicone or other highly biocompatible elastomers and is directly or indirectly fixed to the side wall of the temporal bone or the middle ear cavity through a base or structural design.

[0077] Furthermore, in one embodiment of the invention, the optoelectronic interface is used to connect the optical fiber to the integrated circuit components on the integrated printed circuit board, and the integrated circuit on the integrated printed circuit board is used to convert the optical signal into an AC signal.

[0078] It should be noted that, in this embodiment, as Figure 3As shown, the photoelectric conversion module includes a photoelectric adapter and an integrated printed circuit board. The photoelectric adapter is used to connect the optical fiber to the integrated circuit components on the integrated printed circuit board, thereby ensuring the reception of the optical signal with demodulated audio information. The integrated circuit on the integrated printed circuit board is used to convert the corresponding optical signal into an AC signal. The photoelectric conversion module can be individually packaged in a housing such as polycaprolactone, Peek, or titanium.

[0079] Furthermore, in one embodiment of the invention, the analog-to-digital conversion unit is used to convert the AC signal into a DC signal, and the signal processing unit includes a DSP chip and a processing chip, wherein the signal processing unit is used to process the DC signal to transmit it to the decoding stimulation module.

[0080] It should be noted that, in this embodiment, as Figure 4 As shown, the sound processing module includes an analog-to-digital conversion unit and a signal processing unit. In application, it can be separately packaged in a housing such as titanium. Specifically, the signal processing unit includes a DSP chip and a processing chip. The DSP chip is a microprocessor particularly suitable for performing digital signal processing operations. Its main application is to implement various digital signal processing algorithms in real time and quickly. The analog-to-digital conversion unit is used to convert the transmitted AC signal into a DC signal, while the DSP chip and processing chip are used to process the DC signal to transmit the signal to the decoding stimulation module. Accordingly, the specific processing process is not the focus of this application, so it will not be described in detail in this embodiment.

[0081] Furthermore, in one embodiment of the invention, the cochlear stimulation electrode includes a plurality of electrode contacts, wherein the material of the electrode contacts includes at least pure platinum or a platinum-iridium alloy.

[0082] It should be noted that, in this embodiment, as Figure 5 As shown, the decoding stimulation module includes a decoding stimulation chip and a decoding stimulation circuit. In application, it can be separately encapsulated in a shell such as titanium metal. It is used to convert electrical signals containing sound information into pulse signals, thereby electrically stimulating the auditory nerve through cochlear stimulation electrodes. The cochlear stimulation electrodes include a number of electrode contacts, such as "20-26" electrode contacts. The material of the electrode contacts includes at least pure platinum or platinum-iridium alloy. The entire assembly is encapsulated with medical-grade implantable silicone or other highly biocompatible elastomers.

[0083] Furthermore, in one embodiment of the invention, the charging and discharging circuit includes a charging processing unit and a digital-to-analog converter unit. The digital-to-analog converter unit is used to convert the DC power of the rechargeable battery into AC power for power supply. When the external charger wirelessly transmits energy to the charging coil, the charging processing unit is used to process the energy acquired by the charging coil to charge the rechargeable battery.

[0084] It should be noted that, in this embodiment, as Figure 6 As shown, the implanted power module includes a rechargeable battery, a charging coil, and a charging / discharging circuit. The charging / discharging circuit includes a charging processing unit and a digital-to-analog converter. When an external charger wirelessly transmits energy to the charging coil, the charging processing unit processes the energy obtained from the charging coil to charge the rechargeable battery. The rechargeable battery converts the DC signal into an AC signal through the digital-to-analog converter to power other corresponding modules. Accordingly, the implanted power module can also be separately encapsulated in a housing such as titanium.

[0085] Furthermore, in one embodiment of the invention, the photoelectric conversion module, the sound processing module, the decoding stimulation module, and the implanted power module are encapsulated in a preset housing, wherein the photoelectric conversion module, the sound processing module, and the decoding stimulation module are integrated into one unit, and the material of the housing includes at least titanium metal.

[0086] It should be noted that, as described in the above embodiments, the photoelectric conversion module can be individually packaged in a housing such as polycaprolactone, Peek, or titanium, the sound processing module can be individually packaged in a housing such as titanium, and the decoding stimulation module can be individually packaged in a housing such as titanium. Therefore, in this embodiment, the photoelectric conversion module, the sound processing module, and the decoding stimulation module can be integrated into one unit to save costs in practical applications. The housing material typically includes titanium.

[0087] Furthermore, in one embodiment of the invention, the device further includes a calibration module, which includes an external microphone and a wireless transmission unit, and is used to calibrate the sound information received by the sound processing module.

[0088] It should be noted that, in this embodiment, as Figure 7As shown, the calibration module includes an external microphone and a wireless transmission unit. The external microphone can be placed near the entrance of the external auditory canal to collect external sound information. The signal is transmitted to the sound processing module inside the body via the wireless transmission unit. Then, through the sound processing module and the decoding stimulation module, it is converted into a pulse electrical signal that stimulates the auditory nerve. The function module setting of collecting sound through the external microphone can realize the functional testing and calibration of the sound acquisition of the in-body optical sensing module during the initial implantation, and can also realize the periodic calibration of the sound acquisition quality of the in-body optical sensing module during long-term implantation, so as to ensure the hearing quality of the patient throughout the entire life cycle of the fully implantable cochlear implant shown in this patent.

[0089] In the embodiments provided by this invention, it should be understood that the disclosed systems, apparatuses, or methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative. For instance, the division of modules / units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple modules or units may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection of apparatuses or modules or units may be electrical, mechanical, or other forms.

[0090] The modules / units described as separate components may or may not be physically separate. The components shown as modules / units may or may not be physical modules; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules / units can be selected to achieve the objectives of the embodiments of the present invention, depending on actual needs. For example, the functional modules / units in the various embodiments of the present invention may be integrated into one processing module, or each module / unit may exist physically separately, or two or more modules / units may be integrated into one module / unit.

[0091] Those skilled in the art will further recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of both. To clearly illustrate the interchangeability of hardware and software, the components and steps of the various examples have been generally described in terms of functionality in the foregoing description. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementations should not be considered beyond the scope of this invention.

[0092] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. An optically-based fully implantable cochlear implant device, characterized in that, include: An optical sensing module includes a light generator and a photodetector. The optical sensing module is used to emit a light source and receive light signals reflected back from a sound vibration module. The sound vibration module includes a tympanic membrane or ossicles connected to the auditory conduction pathway structure. The photoelectric conversion module, which is optically connected to the optical sensing module, includes a photoelectric adapter and an integrated printed circuit board. The photoelectric conversion module is used to convert the received optical signal into an alternating current signal. A sound processing module electrically connected to the photoelectric conversion module, the sound processing module including an analog-to-digital conversion unit and a signal processing unit, the sound processing module being used to process sound information and convert the AC signal into a DC signal; A decoding stimulation module electrically connected to the sound processing module, the decoding stimulation module including a decoding stimulation chip and a decoding stimulation circuit, the decoding stimulation module being used to decode sound information and convert the DC signal into a pulse signal; Cochlear stimulation electrodes electrically connected to the decoding stimulation module, the cochlear stimulation electrodes being used for auditory nerve electrical stimulation based on pulse signals; and An implantable power module is provided, comprising a rechargeable battery, a charging coil, and a charging / discharging circuit. The implantable power module is electrically connected to the photoelectric conversion module, the sound processing module, and the decoding stimulation module, respectively, for supplying power.

2. The optically-based fully implantable cochlear implant device according to claim 1, characterized in that, The sound vibration module also includes a reflective material, which is fixed to the tympanic membrane or the ossicles. The reflective material is made of at least barium titanate glass.

3. The optically-based fully implantable cochlear implant device according to claim 1, characterized in that, The light generator is used to emit a light source of a specified wavelength to the sound vibration module, and the photodetector is used to receive the light signal reflected back by the sound vibration module based on the light source of the specified wavelength.

4. The optically-based fully implantable cochlear implant device according to claim 1, characterized in that, The optoelectronic interface is used to connect the optical fiber to the integrated circuit components on the integrated printed circuit board, and the integrated circuit on the integrated printed circuit board is used to convert the optical signal into an AC signal.

5. The optically-based fully implantable cochlear implant device according to claim 1, characterized in that, The analog-to-digital conversion unit is used to convert the AC signal into a DC signal. The signal processing unit includes a DSP chip and a processing chip. The signal processing unit is used to process the DC signal to transmit it to the decoding stimulation module.

6. The optically-based fully implantable cochlear implant device according to claim 1, characterized in that, The charging and discharging circuit includes a charging processing unit and a digital-to-analog converter. The digital-to-analog converter is used to convert the DC power of the rechargeable battery into AC power for power supply. When the external charger wirelessly transmits energy to the charging coil, the charging processing unit is used to process the energy acquired by the charging coil to charge the rechargeable battery.

7. The optically-based fully implantable cochlear implant device according to claim 1, characterized in that, The cochlear stimulation electrode includes a plurality of electrode contacts, wherein the material of the electrode contacts includes at least pure platinum or a platinum-iridium alloy.

8. The optically-based fully implantable cochlear implant device according to claim 1, characterized in that, The photoelectric conversion module, the sound processing module, the decoding stimulation module, and the implanted power module are encapsulated in a pre-designed housing, wherein the photoelectric conversion module, the sound processing module, and the decoding stimulation module are integrated into one unit, and the housing is made of at least titanium metal.

9. The optically-based fully implantable cochlear implant device according to claim 1, characterized in that, The optical sensing module is encapsulated in implantable silicone, and the cochlear stimulation electrode is wrapped in implantable silicone.

10. The optically-based fully implantable cochlear implant device according to claim 1, characterized in that, The device also includes a calibration module, which includes an external microphone and a wireless transmission unit. The calibration module is used to calibrate the sound information received by the sound processing module.

Images