CN115038025A - Integration and optimization of fully implanted artificial middle ear system - Google Patents

Abstract

The invention discloses integration and optimization of a fully-implanted artificial middle ear system, which comprises a voice processing circuit, a sound pick-up and an exciting coil, wherein the sound pick-up and the exciting coil are electrically connected with the voice processing circuit; the excitation coil is implanted into the ear canal of a person through an operation, and the vibrator is implanted on the auditory ossicle of the person; the voice processing circuit comprises a preamplifier and is used for amplifying a weak electric signal input by the voice lifter; the power amplification circuit carries out power amplification with the audio frequency amplification signal of preceding stage, exports sufficient power drive subordinate's exciting coil to the oscillator of drive connection auditory bone produces corresponding vibration, and stapes footplate spread the vibration into the inner ear, arouse the sense of hearing, make originally suffered the acoustic chain of destruction obtain recovering, can increase substantially the hearing.

Description

Integration and optimization of fully implanted artificial middle ear system

Technical Field

The invention relates to the field of hearing aids, in particular to integration and optimization of a fully implanted artificial middle ear system.

Background

Chronic otitis media is a common disease, frequently encountered, and patients often affect normal life and work due to hearing loss. Still other patients have a substantial hearing loss due to overdose of dry medication. The method for improving hearing mainly comprises the steps of firstly, carrying out tympanoplasty to improve the hearing of partial patients, but the postoperative hearing improvement effect of the patients with hearing reduction caused by pathological changes is difficult to satisfy, and secondly, wearing the hearing aid to increase the volume of language, but the hearing aid cannot faithfully transmit extremely complex sound waves such as the language into ears, so that the patients have obvious disappointing feeling and poor definition.

Disclosure of Invention

Aiming at the defects of the prior art, the invention designs a full-implantation artificial middle ear system.

The design scheme of the invention is as follows: the system comprises a voice processing circuit, a sound pick-up and an exciting coil which are electrically connected with the voice processing circuit, wherein the exciting coil is electrically connected with a vibrator; the excitation coil is implanted into the ear canal of a person through an operation, and the vibrator is implanted on the auditory ossicle of the person; the voice processing circuit comprises a preamplifier and is used for amplifying a weak electric signal input by the sound lifter; the voice-frequency amplifier also comprises an ALC circuit, an amplifying circuit, a volume adjusting circuit and a power amplifying circuit, wherein the amplifying circuit amplifies audio signals, level control is used for realizing automatic gain control, enough amplification amount is ensured when small signals are input, along with gain reduction of the signal enhancement amplifier, the volume adjusting circuit adjusts the volume satisfying the user by the user, the power amplifying circuit amplifies the power of the audio amplification signals of the previous stage, and enough power is output to drive the exciting coil of the next stage.

The pickup adopts an electret condenser microphone, and the oscillator adopts permanent magnet alloy and is made into a ring shape.

For vibration signals, combining with the currently mastered auditory ossicle chain vibration signal acquisition, compensation and processing technology, carrying out data simulation on the incus vibration signals, further programming the incus vibration signals to the sensor to obtain real and effective vibration compensation, implanting the sensor into the middle ear auditory ossicle chain for hearing compensation effect, combining with the middle ear finite element analysis model correlation technology, simulating and analyzing data difference, and optimizing the vibration compensation effect.

The principle of the invention is that a vibrator is implanted in the stapes footplate of the middle ear of a person, a circuit with a sound pick-up converts external sound into an electromagnetic signal and drives the vibrator connected with an auditory bone to generate corresponding vibration, the stapes and the stapes footplate transmit the vibration into the inner ear to excite the auditory sense, so that the originally damaged sound transmission chain is recovered, and the hearing can be greatly improved.

Drawings

FIG. 1 is a block diagram of the circuit configuration of the present invention; fig. 2 is a schematic diagram of a vibrator structure.

Detailed Description

The invention is further described with reference to the following specific embodiments and the accompanying drawings. The specific embodiments described herein are merely illustrative of the invention and are not intended to be limiting.

Example (b): the total implantable artificial middle ear system is composed of a voice processing circuit 2, and a sound pickup 1 and an excitation coil 3 electrically connected thereto, as shown in fig. 1, and the excitation coil 3 is electrically connected to a transducer 4. As shown in fig. 2, the vibrator is made of permanent magnetic alloy and is made into a circular ring shape. The exciting coil 3 is implanted into the ear canal of a human through an operation, and the vibrator 4 is implanted on the ossicle of the ear of the human.

The voice processing circuit 2 amplifies the electric signal input by the sound pickup 1 through an amplifying circuit, outputs the signal to drive the exciting coil 3, and generates a magnetic field to act on the vibrator 4. The voice processing circuit comprises a preamplifier 5, and is used for amplifying a weak electric signal input by the sound lifting device; the voice-frequency amplifying circuit comprises an ALC circuit 6, an amplifying circuit 7, a volume adjusting circuit 8 and a power amplifying circuit 9, wherein the amplifying circuit 7 amplifies an audio signal, the level control 10 is used for realizing automatic gain control, enough amplification is guaranteed when a small signal is input, the volume adjusting circuit 8 adjusts the volume which is satisfied by a user along with the reduction of the gain of a signal enhancing amplifier, the power amplifying circuit 9 amplifies the power of the audio amplifying signal of the previous stage, and enough power is output to drive the exciting coil 3 of the next stage.

The pickup adopts the prior universal electret capacitor microphone, has the advantages of small volume, light weight, low price and the like, and has good frequency response characteristic and higher signal-to-noise ratio. The language processing circuit part adopts an integrated chip Ic1= TA7223, and an external bias circuit of the language processing circuit part consists of R1-R11, C1-C20, D1-D3 and W1 for adjusting volume. The excitation coil is made of a high-permeability coated alloy soft magnetic material, the length of an iron core is 25mm, phi =4mm, a high-strength enameled wire with phi =0.16mm is wound outside the iron core, and R =8 omega is formed. The vibrator is made of a platinum magnetic permanent magnet material, the material has good magnetic performance and excellent process processability, and is processed into a ring shape as shown in figure 2, the physical dimension of the vibrator is phi =2.8mm, the thickness of the vibrator is 0.2mm, and the central hole is phi =0.8 mm. The transducer is surgically implanted in the auditory ossicle and the exciter is placed in the outer ear canal.

When the electric signal of the external sound pick-up is amplified and balanced by an electronic circuit and then generates an electromagnetic signal through the exciter, the vibrator is excited by the electromagnetic signal to generate corresponding vibration, a stapes is directly driven to transmit into an inner ear, the auditory sense is excited, and the clinical effect is very obvious. For the vibration signal, the current mastered auditory ossicle chain vibration signal acquisition, compensation and processing technology is combined, the anvil vibration signal is subjected to data simulation, and then the anvil vibration signal is programmed to a sensor so as to obtain real and effective vibration compensation. And for the hearing compensation effect, a sensor is implanted into the ossicular chain of the middle ear, and the data difference is simulated and analyzed by combining the related technology of a finite element analysis model of the middle ear, so that the vibration compensation effect is optimized.

Compared with the prior art, the system has the advantages of reality and clear sound, the hearing is improved obviously through clinical observation, the pure-tone air conduction hearing valve (the average value of 250 HZ-2 KHZ) is 21 db-41.3 db, the average hearing valve after the operation is 26 db-68 db, the average hearing is 30.94db, and the social application level is reached. The system creates a new way for improving the hearing and has good application prospect.

In summary, the preferred embodiments of the present invention are within the scope of the present invention when the functional effects of the changes made according to the technical solutions of the present invention do not exceed the scope of the technical solutions of the present invention.

Claims (3)

1. The system is characterized by comprising a voice processing circuit (2), a sound pick-up (1) and an exciting coil (3), wherein the sound pick-up (1) and the exciting coil (3) are electrically connected with the voice processing circuit, the exciting coil is electrically connected with a vibrator (4), the voice processing circuit (2) amplifies an electric signal input by the sound pick-up (1) through an amplifying circuit, outputs and drives the exciting coil (3), and generates a magnetic field to act on the vibrator (4); the excitation coil (3) is implanted into the ear canal of a person through an operation, and the vibrator (4) is implanted on the ossicle of the ear of the person; the voice processing circuit comprises a preamplifier (5) and is used for amplifying a weak electric signal input by the voice lifting device; the voice-frequency amplification circuit further comprises an ALC (6) circuit, an amplification circuit (7), a volume adjusting circuit (8) and a power amplification circuit (9), wherein the amplification circuit (7) amplifies an audio signal, automatic gain control is realized through a level control (10), a sufficient amplification amount is ensured when a small signal is input, along with the reduction of the gain of the signal enhancement amplifier, the volume adjusting circuit (8) adjusts the volume which is satisfied by a user, the power amplification circuit (9) performs power amplification on the audio amplification signal of the previous stage, and sufficient power is output to drive the excitation coil (3) of the next stage.

2. The assembly of a fully implantable artificial middle ear system according to claim 1, characterized in that the vibrator (4) is made of permanent magnetic alloy and is made into a circular ring shape.

3. The optimization of the fully-implanted artificial middle ear system is characterized in that for vibration signals, the currently mastered vibration signal acquisition, compensation and processing technology of an ossicular chain is combined, the data simulation is carried out on the incus vibration signals, then the incus vibration signals are programmed to a sensor to obtain real and effective vibration compensation, for the hearing compensation effect, the sensor is implanted into the ossicular chain of the middle ear, and the data difference is simulated and analyzed by combining the related technology of a middle ear finite element analysis model to optimize the vibration compensation effect.

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