阅读说明：本技术 一种人工听觉脑干刺激器 (Artificial auditory brainstem stimulator ) 是由 吴皓 于 2020-12-24 设计创作，主要内容包括：本发明提供一种人工听觉脑干刺激器,其每一帧刺激数据都带有刺激电极和回路电极信息,并在每一帧刺激时都可以自由选择刺激电极和回路电极,确保刺激安全有效,不会产生多余电场影响其他中枢,产生由于电刺激导致的非听性反应。为了保证刺激率,采用流水线方式进行刺激,即解码本帧刺激数据同时根据上帧数据进行刺激,将每帧刺激数据加入回路电极信息后的影响降至最低。采用高压电路解决超容顺问题,但是通过灵活选择刺激驱动电路电压将刺激功率进行最优化。采用钛钉和固定纱布对刺激器壳体和电极头进行定位,确保术后不产生移位。采用三维定位头,帮助平板刺激阵列可以以最佳角度放置在耳蜗核位置。(The invention provides an artificial auditory brainstem stimulator, wherein each frame of stimulation data is provided with stimulation electrode and loop electrode information, and the stimulation electrode and the loop electrode can be freely selected during each frame of stimulation, so that the stimulation is safe and effective, and no redundant electric field is generated to influence other centers and generate non-auditory reaction caused by electric stimulation. In order to ensure the stimulation rate, a pipeline mode is adopted for stimulation, namely the stimulation data of the frame is decoded and stimulation is carried out according to the data of the previous frame, and the influence of each frame of stimulation data added into the loop electrode information is reduced to the minimum. The super-compliance problem is solved by using a high voltage circuit, but the stimulation power is optimized by flexibly selecting the voltage of the stimulation driving circuit. The titanium nail and the fixed gauze are adopted to position the shell and the electrode head of the stimulator, so that no displacement is generated after operation. The three-dimensional positioning head is adopted to help the flat plate stimulation array to be placed at the position of the cochlear nucleus at an optimal angle.)

1. An artificial auditory brainstem stimulator, comprising:

the receiving coil is used for receiving the radio frequency signal with the coded information and detecting the radio frequency signal;

the control stimulation module is connected with the receiving coil and used for calculating a voltage value required by stimulation according to the stimulation signal of the previous frame and the impedance information of the corresponding electrode and outputting a corresponding stimulation waveform;

and the flat electrode tip is connected with the control stimulation module and is used for stimulating the nerve tissue according to the stimulation waveform and forming an acoustic response.

2. The artificial auditory brainstem stimulator of claim 1, wherein the receive coil comprises:

the parallel resonance circuit is used for receiving a radio frequency signal with coded information from the outside;

and the half-wave detection circuit is connected with the parallel resonance circuit and is used for detecting the accessed radio frequency signal.

3. The artificial auditory brainstem stimulator of claim 1, wherein the control stimulation module includes:

the signal decoding circuit is connected with the receiving coil and used for decoding the radio frequency signal;

the central processing unit is connected with the signal decoding circuit and used for receiving decoded data;

the first stimulation data register is connected with the central processing unit and used for receiving and storing the data signal of the frame from the central processing unit and pushing stimulation data into the second stimulation data register according to a control instruction of the central processing unit after stimulation is finished;

the second stimulation data register is connected with the central processing unit and is used for outputting the stored previous frame stimulation data signal to the central processing unit before stimulation starts;

the Flash memory is connected with the central processing unit and is used for storing the electrode impedance information and transmitting the impedance information of the corresponding electrode to the central processing unit;

the power supply management unit is used for supplying power to the artificial auditory brainstem stimulator;

the current stimulation unit is connected with the central processing unit and is used for forming a corresponding stimulation waveform according to the calculation result of the central processing unit;

and the titanium nail positioning holes are positioned at two sides of the titanium alloy shell for wrapping the circuit and are used for fixing the titanium nail on the postoperative skull.

4. The artificial auditory brainstem stimulator of claim 3, wherein the power management unit comprises:

the analog linear voltage stabilizing circuit is used for supplying power to a low-voltage analog circuit in the artificial auditory brainstem stimulator;

the digital linear voltage stabilizing circuit is used for supplying power to a low-voltage digital circuit in the artificial auditory brainstem stimulator;

and the direct current-to-direct current conversion circuit is used for outputting a plurality of voltages with different voltage grades.

5. The artificial auditory brainstem stimulator of claim 4, wherein the current stimulation unit comprises:

the digital-to-analog conversion current source circuit is connected with the central processing unit and is used for converting the current stimulation amplitude related digital signal sent by the central processing unit into a corresponding analog current source;

the stimulation driving circuit is connected with the digital-to-analog conversion current source circuit and used for amplifying and boosting the current generated by the digital-to-analog conversion current source circuit in a mirror image mode to generate driving current;

and the stimulation control switch array is connected with the central processing unit, the stimulation driving circuit, the direct current-to-direct current conversion circuit and the flat electrode tip and used for selecting the stimulation electrode and the loop electrode in the flat electrode tip according to digital signals of the stimulation electrode and the loop electrode sent by the central processing unit and selecting one output voltage in the direct current-to-direct current conversion circuit as the power supply voltage of the stimulation driving circuit according to a calculation result of the central processing unit so as to form a positive and negative two-phase output stimulation waveform.

6. The artificial auditory brainstem stimulator according to claim 5, wherein the central processing unit calculates a compliance voltage according to the electrode impedance and the stimulation current amplitude stored in the Flash memory, and selects one path of voltage output in the dc-dc conversion circuit as a power supply voltage of the stimulation driving circuit.

7. The artificial auditory brainstem stimulator of claim 5, wherein the planar electrode tip comprises:

the flat electrode array is connected with the stimulation control switch array and is used for stimulating the nerve tissue and forming an acoustic response;

the fixed gauze is used for fixing the postoperative flat electrode tip;

and the three-dimensional positioning head is used for executing steering operation so as to adjust the placement angle of the flat plate electrode head on the cochlear nucleus.

8. The artificial auditory brainstem stimulator of claim 7, wherein any electrode on said flat electrode head can be selected as a stimulation electrode and a return electrode; and when each frame is stimulated, the stimulation control switch array selects according to the stimulation information and generates a two-phase stimulation waveform in a stimulation electrode and loop electrode reverse selection mode.

9. The artificial auditory brainstem stimulator of claim 7, wherein the three-dimensional positioning head is composed of 3 pieces of silicone, sequentially located at the rear of the flat plate electrode array, and respectively forming 45 degrees, 90 degrees and 135 degrees with the flat plate electrode array.

10. The artificial auditory brainstem stimulator of claim 4, wherein the supply voltage generated by the dc-to-dc conversion circuit comprises from high to low 2 to 8 supply voltages in the range of 2.5-25 volts.

Technical Field

The invention relates to the technical field of artificial auditory reconstruction, in particular to an artificial auditory brainstem stimulator.

Background

For patients with neurofibromatosis type 2, bilateral traumatic auditory nerve avulsion, auditory nerve/cochlear hypoplasia or non-development, cochlear ossification and other diseases, the artificial cochlea can not benefit the patients. Artificial auditory brainstem implant techniques allow a patient to regain hearing by directly stimulating their brainstem cochlear nucleus by bypassing the auditory nerve. The artificial auditory brainstem stimulator is the key for determining the using effect of a patient as the core of the technology.

The existing artificial auditory brainstem stimulator is usually formed by modifying an artificial cochlea and generally only has a fixed loop electrode, but a cochlear nucleus is positioned in the brainstem, other parts of the brainstem have a plurality of important central nervous tissues which can influence life, higher requirements on stimulation safety and effectiveness are provided, and a stimulation electric field must be accurately controlled, so that the stimulation electrode and the loop electrode need to be selected more flexibly, the safety and effectiveness of the postoperative use of a user are ensured, and meanwhile, the device also has very important function on the extraction of an EABR signal in the operation.

The phenomenon of so-called super-compliance often occurs in nerve stimulation, namely, the stimulation current multiplied by the electrode impedance exceeds the power supply voltage, so that the nerve cannot be stimulated sufficiently, and the using effect of a user is influenced. The use of high voltage stimulation is an inevitable choice for nerve stimulation, but high voltage stimulation causes a significant increase in stimulation power, and particularly for electrodes without super-compliance, high voltage stimulation is unnecessary, which causes unnecessary energy waste and reduces the battery life of a user.

The fixing and operation method in the operation process also plays a vital role in the rehabilitation effect of a user and the postoperative safety, and important human life-related centers are distributed on the brainstem, so that once the parts are stimulated, life risks can be caused. Therefore, how to conveniently locate the cochlea core position in the operation process to ensure that the displacement phenomenon does not occur at any part of the stimulator after the operation becomes a technical problem which needs to be solved in the field.

Disclosure of Invention

In view of the above-mentioned drawbacks of the prior art, it is an object of the present invention to provide an artificial auditory brainstem stimulator that solves the problems of the prior art.

To achieve the above and other related objects, a first aspect of the present invention provides an artificial auditory brainstem stimulator, comprising: the receiving coil is used for receiving the radio frequency signal with the coded information and detecting the radio frequency signal; the control stimulation module is connected with the receiving coil and used for calculating a voltage value required by stimulation according to the stimulation signal of the previous frame and the impedance information of the corresponding electrode and outputting a corresponding stimulation waveform; and the flat electrode tip is connected with the control stimulation module and is used for stimulating the nerve tissue according to the stimulation waveform and forming an acoustic response.

In some embodiments of the first aspect of the present invention, the receiving coil comprises: the parallel resonance circuit is used for receiving a radio frequency signal with coded information from the outside; and the half-wave detection circuit is connected with the parallel resonance circuit and is used for detecting the accessed radio frequency signal.

In some embodiments of the first aspect of the present invention, the control stimulation module comprises: the signal decoding circuit is connected with the receiving coil and used for decoding the radio frequency signal; the central processing unit is connected with the signal decoding circuit and used for receiving decoded data; the first stimulation data register is connected with the central processing unit and used for receiving and storing the data signal of the frame from the central processing unit and pushing stimulation data into the second stimulation data register according to a control instruction of the central processing unit after stimulation is finished; the second stimulation data register is connected with the central processing unit and is used for outputting the stored previous frame stimulation data signal to the central processing unit before stimulation starts; the Flash memory is connected with the central processing unit and is used for storing the electrode impedance information and transmitting the impedance information of the corresponding electrode to the central processing unit; the power supply management unit is used for supplying power to the artificial auditory brainstem stimulator; the current stimulation unit is connected with the central processing unit and is used for forming a corresponding stimulation waveform according to the calculation result of the central processing unit; and the titanium nail positioning holes are positioned at two sides of the titanium alloy shell for wrapping the circuit and are used for fixing the titanium nail on the postoperative skull.

In some embodiments of the first aspect of the present invention, the power management unit comprises: the analog linear voltage stabilizing circuit is used for supplying power to a low-voltage analog circuit in the artificial auditory brainstem stimulator; the digital linear voltage stabilizing circuit is used for supplying power to a low-voltage digital circuit in the artificial auditory brainstem stimulator; and the direct current-to-direct current conversion circuit is used for outputting a plurality of voltages with different voltage grades.

In some embodiments of the first aspect of the present invention, the current stimulation unit comprises: the digital-to-analog conversion current source circuit is connected with the central processing unit and is used for converting the current stimulation amplitude related digital signal sent by the central processing unit into a corresponding analog current source; the stimulation driving circuit is connected with the digital-to-analog conversion current source circuit and used for amplifying and boosting the current generated by the digital-to-analog conversion current source circuit in a mirror image mode to generate driving current; and the stimulation control switch array is connected with the central processing unit, the stimulation driving circuit, the direct current-to-direct current conversion circuit and the flat electrode tip and used for selecting the stimulation electrode and the loop electrode in the flat electrode tip according to digital signals of the stimulation electrode and the loop electrode sent by the central processing unit and selecting one output voltage in the direct current-to-direct current conversion circuit as the power supply voltage of the stimulation driving circuit according to a calculation result of the central processing unit so as to form a positive and negative two-phase output stimulation waveform.

In some embodiments of the first aspect of the present invention, the central processing unit calculates the compliance voltage according to the electrode impedance and the stimulation current amplitude stored in the Flash memory, and selects one voltage output of the dc-dc conversion circuit as the power supply voltage of the stimulation driving circuit.

In some embodiments of the first aspect of the present invention, the flat plate electrode head comprises: the flat electrode array is connected with the stimulation control switch array and is used for stimulating the nerve tissue and forming an acoustic response; the fixed gauze is used for fixing the postoperative flat electrode tip; and the three-dimensional positioning head is used for executing steering operation so as to adjust the placement angle of the flat plate electrode head on the cochlear nucleus.

In some embodiments of the first aspect of the present invention, any of the electrodes on the planar electrode head can be selected to be a stimulation electrode and a return electrode; and when each frame is stimulated, the stimulation control switch array selects according to the stimulation information and generates a two-phase stimulation waveform in a stimulation electrode and loop electrode reverse selection mode.

In some embodiments of the first aspect of the present invention, the three-dimensional positioning head is composed of 3 silicon sheets, sequentially located at the rear of the flat-plate electrode array, and respectively forming 45 degrees, 90 degrees and 135 degrees with the flat-plate electrode array.

In some embodiments of the first aspect of the present invention, the power supply voltage generated by the dc-dc conversion circuit includes 2 to 8 power supply voltages from high to low, and the voltage range is 2.5-25 v.

As described above, the artificial auditory brainstem stimulator according to the present invention has the following advantageous effects: according to the artificial auditory brainstem stimulator, each frame of stimulation data is provided with the information of the stimulation electrode and the circuit electrode, and the stimulation electrode and the circuit electrode can be freely selected during each frame of stimulation, so that the stimulation is safe and effective, and the phenomenon that redundant electric fields influence other centers and generate non-auditory responses caused by electric stimulation is avoided. In order to ensure the stimulation rate, a pipeline mode is adopted for stimulation, namely the stimulation data of the frame is decoded and stimulation is carried out according to the data of the previous frame, and the influence of each frame of stimulation data added into the loop electrode information is reduced to the minimum. The super-compliance problem is solved by using a high voltage circuit, but the stimulation power is optimized by flexibly selecting the voltage of the stimulation driving circuit. The titanium nail and the fixed gauze are adopted to position the shell and the electrode head of the stimulator, so that no displacement is generated after operation. The three-dimensional positioning head is adopted to help the flat plate stimulation array to be placed at the position of the cochlear nucleus at an optimal angle.

Drawings

Fig. 1 is a schematic structural diagram of an artificial auditory brainstem stimulator according to an embodiment of the present invention.

Fig. 2 is a schematic partial structural diagram of an artificial auditory brainstem stimulator according to an embodiment of the present invention.

Fig. 3 is a schematic structural diagram of a flat plate electrode head according to an embodiment of the invention.

Fig. 4 is a schematic diagram illustrating a stimulation operation process of the artificial auditory brainstem stimulator according to an embodiment of the present invention.

Fig. 5 is a schematic structural diagram of a current stimulating unit according to an embodiment of the present invention.

Detailed Description

The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict.

It is noted that in the following description, reference is made to the accompanying drawings which illustrate several embodiments of the present invention. It is to be understood that other embodiments may be utilized and that mechanical, structural, electrical, and operational changes may be made without departing from the spirit and scope of the present invention. The following detailed description is not to be taken in a limiting sense, and the scope of embodiments of the present invention is defined only by the claims of the issued patent. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Spatially relative terms, such as "upper," "lower," "left," "right," "lower," "below," "lower," "above," "upper," and the like, may be used herein to facilitate describing one element or feature's relationship to another element or feature as illustrated in the figures.

In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," "retained," and the like are to be construed broadly, e.g., as meaning fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

Also, as used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context indicates otherwise. It will be further understood that the terms "comprises," "comprising," and/or "comprising," when used in this specification, specify the presence of stated features, operations, elements, components, items, species, and/or groups, but do not preclude the presence, or addition of one or more other features, operations, elements, components, items, species, and/or groups thereof. The terms "or" and/or "as used herein are to be construed as inclusive or meaning any one or any combination. Thus, "A, B or C" or "A, B and/or C" means "any of the following: a; b; c; a and B; a and C; b and C; A. b and C ". An exception to this definition will occur only when a combination of elements, functions or operations are inherently mutually exclusive in some way.

In order to conveniently position the artificial auditory brainstem stimulator to the position of a cochlear nucleus in the operation process so as to ensure that no displacement phenomenon occurs at any part of the stimulator after the operation, the invention provides the artificial auditory brainstem stimulator which can flexibly select a stimulation electrode and a loop electrode for each frame stimulation, simultaneously determines the stimulation voltage according to the requirement, is convenient to implant and fix in the operation, and has the characteristics of flexibility, convenience, easy implantation, safety, reliability, power consumption saving and the like.

In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions in the embodiments of the present invention are further described in detail by the following embodiments in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Fig. 1 shows a schematic structural diagram of an artificial auditory brainstem stimulator according to an embodiment of the present invention. The artificial auditory brainstem stimulator 100 of the present embodiment includes a receiving coil 10, a control stimulation module 20, and a flat plate electrode tip 30. The receiving coil 10 is used for receiving and detecting a radio frequency signal with coded information; the control stimulation module 20 is connected to the receiving coil 10, and is configured to calculate a voltage value required for stimulation according to the previous frame stimulation signal and impedance information of the corresponding electrode, and output a corresponding stimulation waveform; the flat electrode tip 30 is connected to the control stimulation module 20, and is used for stimulating nerve tissue and forming an acoustic response according to the stimulation waveform.

Fig. 2 is a schematic diagram showing a partial structure of an artificial auditory brainstem stimulator according to an embodiment of the present invention. The receiving coil 10 includes a parallel resonance circuit 110 and a half-wave detection circuit 120; the control stimulation module 20 includes a signal decoding circuit 210, a central processing unit 220, a first stimulation data register 230, a second stimulation data register 240, a Flash memory 250, a power management unit 260, a current stimulation unit 270, and a titanium nail positioning hole 280.

The parallel resonant circuit 110 is connected to a transmitting coil (not shown) of an external system in a centering manner by means of inductive coupling, and is used for receiving a radio frequency signal with encoded information transmitted by the external system. The half-wave detection circuit 120 is connected to the parallel resonance circuit 110, and detects an input radio frequency signal.

The signal decoding circuit 210 is connected to the half-wave detection circuit 120, and is configured to demodulate and decode the detected signal sent by the half-wave detection circuit 120.

The central processor 220 is connected to the signal decoding circuit 210 for receiving the decoded data.

The first stimulation data register 230 is connected to the central processing unit 220, and is configured to receive and store the data signal of the current frame from the central processing unit, and push stimulation data into the second stimulation data register according to a control instruction of the central processing unit after stimulation is completed.

The second stimulation data register 240 is connected to the central processing unit 220, and is used for outputting the stored stimulation data signal of the previous frame to the central processing unit before the stimulation starts.

The Flash memory 250 is connected to the central processing unit 220, and is configured to store the electrode impedance information and transmit the impedance information of the corresponding electrode to the central processing unit 220. The central processor 220 calculates a voltage value required for stimulation according to the previous frame stimulation information retained by the second stimulation data register 240 and the corresponding electrode impedance information retained by the Flash memory 250, and outputs a related stimulation control signal.

The power management unit 260 specifically includes a linear voltage stabilizing circuit 261, a digital linear voltage stabilizing circuit 262, and a dc-to-dc conversion circuit 263, where the linear voltage stabilizing circuit 261 is used to supply power to a low-voltage analog circuit in the stimulator, the digital linear voltage stabilizing circuit 262 is used to supply power to a low-voltage digital circuit in the stimulator, and the dc-to-dc conversion circuit 263 outputs a plurality of voltages from high to low for supplying power to the stimulator under different conditions.

In some examples, the DC-DC converter 263 can generate 2-8 power voltages from high to low, with a voltage range of 2.5-25V.

The current stimulation unit 270 includes a digital-to-analog conversion current source circuit 271, a stimulation driving circuit 272, and a stimulation control switch array 273, wherein the digital-to-analog conversion current source circuit 271 is connected to the central processing unit 220, and converts the current stimulation amplitude-related digital signal sent by the central processing unit 220 into a corresponding analog current source; the stimulation driving circuit 272 is connected to the digital-to-analog conversion current source circuit 271, and is configured to amplify and boost a current generated by the digital-to-analog conversion current source circuit 271 in a mirror image manner to generate a driving current; the stimulation control switch array 273 is connected to the central processing unit 220, the stimulation driving circuit 272, the dc-to-dc conversion circuit 263 and the flat plate electrode tip 30, the stimulation control switch array 273 selects the stimulation electrode and the return electrode in the flat plate electrode tip according to the digital signals of the stimulation electrode and the return electrode sent by the central processing unit 220, and selects one output voltage of the dc-to-dc conversion circuit 263 as the power voltage of the stimulation driving circuit 272 according to the calculation result of the central processing unit 220, thereby finally forming a positive and negative two-phase output stimulation waveform.

In some examples, the central processor 220 calculates a capacitive voltage according to the electrode impedance and the stimulation current amplitude retained in the Flash memory 250, and selects one voltage output of the dc-dc conversion circuit 263 as a power supply voltage of the stimulation driving circuit 272.

Further, the central processing unit 220 receives the stimulation information of the current frame and pushes the stimulation information into the first stimulation data register 230, and simultaneously, according to the stimulation data of the previous frame retained in the second stimulation data register 240, the stimulation control switch array 273 is controlled to stimulate the corresponding neural tissue. After the stimulation is completed, the stimulation information of the current frame is pushed from the first stimulation data register 230 to the second stimulation register 240.

The titanium nail positioning holes 280 are positioned at two sides of the titanium alloy shell for wrapping the circuit and are used for fixing the titanium nail on the cranium after operation so as to prevent the stimulator from shifting. The titanium nail positioning holes 280 in this embodiment are located on both sides of the titanium alloy housing of the stimulator, and are made of medical silica gel material, and the diameter is 1-4 mm.

As shown in fig. 3, a schematic structural diagram of a flat plate electrode head in an embodiment of the invention is shown. The flat electrode head 30 of the present embodiment includes a flat electrode array 310, a fixing gauze 320, and a three-dimensional positioning head 330. The flat-plate electrode array 310 is connected to the stimulation control switch array 273, and is used for stimulating neural tissue to generate an acoustic response. The fixing gauze 320 is used for fixing the flat electrode tip after operation without displacement. The three-dimensional positioning head 330 is used for conveniently steering the flat electrode head when a surgical tool is used in an operation, so that the flat electrode head can be placed on a cochlear nucleus at an optimal angle. The three-dimensional positioning head 330 is composed of 3 silica gel sheets, sequentially located at the rear part of the flat plate electrode array 310, and respectively forms 45 degrees, 90 degrees and 135 degrees with the flat plate electrode array 310.

In some examples, any of the electrodes on the flat electrode head 30 may be selected as a stimulation electrode and a return electrode, and the stimulation control switch array 273 selects according to the stimulation information at each frame of stimulation, and generates a biphasic stimulation waveform by a stimulation electrode and return electrode reverse selection manner.

The structure of the artificial auditory brainstem stimulator is explained in detail above; hereinafter, the stimulation operation of the artificial auditory brainstem stimulator will be further described with reference to fig. 4.

Fig. 4 is a schematic diagram showing a stimulation operation process of the artificial auditory brainstem stimulator according to an embodiment of the present invention. The stimulation data consists of data head, stimulation electrodes, loop electrodes and stimulation amplitude information, and the stimulation electrodes, the loop electrodes and the stimulation amplitudes in the first frame of stimulation data are E1, E10 and 255, respectively. The central processor decodes the data sequentially and pushes the decoded data into the first stimulation data register when the stimulator stimulates the current frame, so that the stimulation electrodes, the loop electrodes and the stimulation amplitudes of the data stored in the first stimulation data register are also E1, E10 and 255. In addition, the central processing unit also stimulates according to the previous frame stimulation data (the stimulation electrodes, the circuit electrodes and the stimulation amplitudes are respectively E2, E18 and 50) stored in the second stimulation data register, multiplies the impedance information between E2 and E18 stored in the Flash memory by the stimulation amplitude 50, and selects the low-voltage power supply voltage output by the direct current-to-direct current conversion circuit as the voltage supply of the stimulation driving circuit and the stimulation control switch array.

Since the first negative and then positive two-phase stimulation waveforms are used, E18 in the data selector MUX1 and E2 in the data selector MUX2 in the current stimulation unit shown in fig. 5 are selected first to generate the negative phase waveforms, and then E2 in the data selector MUX1 and E18 in the data selector MUX2 are selected to generate the positive phase waveforms. After the stimulation is completed, the central processing unit 220 pushes the data stored in the first stimulation data register 230 into the second stimulation data register 240. Accordingly, the stimulus data held in the second stimulus data register 240 becomes E1, E10, and 255. At this time, the stimulation electrodes, the loop electrodes, and the stimulation amplitudes in the second frame of stimulation data are E3, E7, and 100, respectively. The central processor 220 decodes the stimulation data in sequence at the time of stimulation of the frame and pushes the decoded stimulation data into the first stimulation data register 230, so that the data stored in the register 230 are E3, E7 and 100, respectively. Meanwhile, the central processing unit 220 performs stimulation according to the previous frame stimulation data (E1, E10, 255, respectively) stored in the second stimulation data register 240, the central processing unit 220 multiplies the impedance information between E1 and E10 stored in the Flash memory 250 by the stimulation amplitude 255, and selects and uses the high-voltage VH power supply voltage output from 263 in fig. 5 as the voltage supply of the stimulation driving circuit 272 and the stimulation control switch array 273. With the first negative and then positive biphasic stimulation waveforms, E10 in data selector MUX1 and E1 in data selector MUX2 in fig. 3 are selected first to produce the negative phase waveform, and then E1 in data selector MUX1 and E10 in data selector MUX2 are selected to produce the positive phase waveform. After the stimulation is completed, the cpu 220 pushes the data (E3, E7, 100) stored in the first stimulation data register 230 into the second stimulation data register 240.

From the above, the artificial auditory brainstem stimulator provided by the invention solves the practical difficulties in the prior art, greatly improves the stimulation safety, ensures the controllability of an electric field, improves the stimulation speed by adopting the pipeline mode stimulation, selects the power supply voltage according to the electrode stimulation compliance condition, ensures the stimulation effectiveness, saves the power consumption, particularly fixes the stimulator and the electrode tip, and ensures that the postoperative displacement condition is not generated. Therefore, the invention effectively overcomes various defects in the prior art and has high industrial utilization value.

The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.