CN112564312A - Visual prosthesis wireless power supply system with self-shielding function and control method thereof - Google Patents
Visual prosthesis wireless power supply system with self-shielding function and control method thereof Download PDFInfo
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- 230000000007 visual effect Effects 0.000 title claims abstract description 48
- 238000000034 method Methods 0.000 title claims abstract description 22
- 238000006243 chemical reaction Methods 0.000 claims abstract description 17
- 230000001276 controlling effect Effects 0.000 claims abstract description 11
- 230000001105 regulatory effect Effects 0.000 claims abstract description 11
- 230000005670 electromagnetic radiation Effects 0.000 claims abstract description 8
- 238000001514 detection method Methods 0.000 claims description 53
- 230000000638 stimulation Effects 0.000 claims description 20
- 239000010753 BS 2869 Class E Substances 0.000 claims description 9
- 230000033228 biological regulation Effects 0.000 claims description 6
- 230000006698 induction Effects 0.000 claims description 6
- 230000004907 flux Effects 0.000 claims description 5
- 230000001939 inductive effect Effects 0.000 claims description 5
- 230000005855 radiation Effects 0.000 claims description 4
- 230000004936 stimulating effect Effects 0.000 claims description 4
- 210000001328 optic nerve Anatomy 0.000 claims description 3
- 230000005540 biological transmission Effects 0.000 abstract description 9
- 208000015181 infectious disease Diseases 0.000 abstract description 3
- 210000001519 tissue Anatomy 0.000 description 6
- 230000008569 process Effects 0.000 description 5
- 230000006378 damage Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000001727 in vivo Methods 0.000 description 3
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000000338 in vitro Methods 0.000 description 2
- 230000003044 adaptive effect Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 208000030533 eye disease Diseases 0.000 description 1
- 230000001815 facial effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 210000005036 nerve Anatomy 0.000 description 1
- 210000000944 nerve tissue Anatomy 0.000 description 1
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- 210000000239 visual pathway Anatomy 0.000 description 1
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/10—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling
- H02J50/12—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling of the resonant type
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
- A61N1/00—Electrotherapy; Circuits therefor
- A61N1/18—Applying electric currents by contact electrodes
- A61N1/32—Applying electric currents by contact electrodes alternating or intermittent currents
- A61N1/36—Applying electric currents by contact electrodes alternating or intermittent currents for stimulation
- A61N1/36046—Applying electric currents by contact electrodes alternating or intermittent currents for stimulation of the eye
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/40—Circuit arrangements or systems for wireless supply or distribution of electric power using two or more transmitting or receiving devices
- H02J50/402—Circuit arrangements or systems for wireless supply or distribution of electric power using two or more transmitting or receiving devices the two or more transmitting or the two or more receiving devices being integrated in the same unit, e.g. power mats with several coils or antennas with several sub-antennas
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/70—Circuit arrangements or systems for wireless supply or distribution of electric power involving the reduction of electric, magnetic or electromagnetic leakage fields
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/80—Circuit arrangements or systems for wireless supply or distribution of electric power involving the exchange of data, concerning supply or distribution of electric power, between transmitting devices and receiving devices
Abstract
The invention discloses a visual prosthesis wireless power supply system with a self-shielding function and a control method thereof, and belongs to the field of biomedical engineering. A visual prosthesis wireless power supply system with a self-shielding function comprises an implanted visual prosthesis, and comprises an external electric energy transmitting end device, an external leakage magnetic field regulating and controlling device and an implanted electric energy receiving end device, wherein the external electric energy transmitting end device is used for generating a high-frequency alternating magnetic field in space and transmitting energy to the implanted electric energy receiving end device; the external leakage magnetic field regulating and controlling device is used for detecting and generating a counteracting magnetic field so as to shield the leakage magnetic field generated by the external electric energy transmitting end device on the face of the human body and reduce electromagnetic radiation; and the implanted electric energy receiving end device is used for receiving the energy sent by the external electric energy transmitting end device and supplying power to the implanted visual prosthesis. The invention avoids the problems of biological tissue infection, rejection reaction and the like caused by a wire interface in the traditional wired transmission and reduces the operation risk.
Description
Technical Field
The invention relates to a visual prosthesis wireless power supply system with a self-shielding function and a control method thereof, belonging to the field of biomedical engineering.
Background
For some eye diseases caused by damage to the visual system, microcurrent can be used to stimulate optic nerve tissue to restore vision of blind patients. With the development of the related art, an implantable medical device, namely a visual prosthesis, becomes an effective treatment scheme. The scheme can bypass the damaged part in the visual pathway of the human body, and the implanted stimulating electrode generates micro-current to stimulate the undamaged nerve tissue, thereby achieving the aim of restoring vision.
The implanted parts in the body of the visual prosthesis, such as a data receiving unit, a micro-current stimulation controller, a stimulation electrode and the like, all need stable energy supply to work normally, and the traditional in-vivo energy supply equipment generally adopts an implanted storage battery. Limited by the limited energy density and short life of the battery, patients often require a second surgery to replace the implanted storage battery periodically after a period of time of installing the visual prosthesis, which increases the surgical risks the patient is required to undertake, increases the surgical costs, and increases the patient's pain. The development of wireless power transmission technology provides a good solution to the above problems. The technology takes a magnetic field as a medium, and energy is transmitted into a receiving coil in vivo through skin in a wireless mode through an external transmitting coil, so that stable energy supply of the implanted visual prosthesis is realized.
At present, scholars at home and abroad have conducted relevant research around wireless power supply systems applied to visual prostheses. Patent publication No. CNIO2813999A proposes a visual prosthesis wireless transmission system with adaptive power adjustment function, which adjusts the input power of the transmitting coil by predicting the energy required for implanting the stimulation electrode. The patent publication No. CNIO3272329 proposes an artificial vision prosthesis device with wireless energy transmission function, and an implanted storage battery can be called to supply power to the artificial vision prosthesis device through a built-in controller of the artificial vision prosthesis device when wireless charging is cut off. The document [ design of energy wireless transmission system in visual prosthesis [ D ]. university of Western Ann sciences, 2019 ] designs a wireless power supply system for the visual prosthesis, and by adding an in-vivo data reverse transmission unit, the charging state of the implanted visual prosthesis can be monitored in real time. However, in the prior art, the basic functions of the wireless power supply system, such as transmission power and transmission efficiency, are focused, the harm of electromagnetic radiation generated by the wireless power supply system during normal operation on a human body is ignored, and relevant electromagnetic shielding measures are not considered, so that the face of a patient is completely exposed to a high-frequency electromagnetic environment during the charging process. On the one hand, the leakage magnetic field generated by the coil can generate a thermal effect in human tissues, and damages sensitive organs or tissues. On the other hand, the high-frequency leakage magnetic field may generate electromagnetic interference to devices such as the implanted micro-current stimulation controller and the stimulation electrode, and the normal operation of the devices is affected.
Disclosure of Invention
The invention provides a visual prosthesis wireless power supply system with a self-shielding function and a control method thereof, aiming at the defects in the existing research, the visual prosthesis wireless power supply system wirelessly supplies power to an implanted visual prosthesis through mutual inductance coupling between a transmitting coil and a receiving coil, avoids the problems of biological tissue infection, rejection reaction and the like caused by a lead interface in the traditional wired transmission, and reduces the operation risk. Meanwhile, through the magnetic field detection coil and the active shielding coil, the leakage magnetic field generated by the coupling coil can be effectively shielded in the normal working process of the system, the purposes of focusing main magnetic flux and reducing the leakage magnetic flux are realized, the electromagnetic radiation of the system to a human body and implanted electronic equipment is reduced, and the self-shielding function of the wireless power supply system is realized.
A visual prosthesis wireless power supply system with a self-shielding function comprises an implanted visual prosthesis, and comprises an external electric energy transmitting end device, an external leakage magnetic field regulating and controlling device and an implanted electric energy receiving end device, wherein,
the external electric energy transmitting end device is used for generating a high-frequency alternating magnetic field in space and transmitting energy to the implanted electric energy receiving end device;
the external leakage magnetic field regulating and controlling device is used for detecting and generating a counteracting magnetic field so as to shield the leakage magnetic field generated by the external electric energy transmitting end device on the face of a human body and reduce electromagnetic radiation;
the implanted electric energy receiving end device is used for receiving the energy sent by the external electric energy transmitting end device and supplying power to the implanted visual prosthesis.
Further, the external electric energy transmitting terminal device comprises a class-E amplifier, a compensating circuit and a transmitting coil, wherein the output end of the class-E amplifier is connected with the compensating circuit, the output end of the compensating circuit is connected with the transmitting coil, wherein,
the class-E amplifier is used for outputting high-frequency voltage at the level of MHz;
the compensation circuit is used for compensating the self-inductance of the transmitting coil and eliminating the reactive power in the system;
the transmitting coil is used for exciting a high-frequency magnetic field in the space after high-frequency current is introduced.
Further, the external leakage magnetic field regulation and control device comprises an active shielding coil, a magnetic field detection coil, a signal conversion device, a DSP controller, a unit control circuit and a shielding coil compensation circuit, wherein the magnetic field detection coil, the signal conversion device, the DSP controller, the unit control circuit, the shielding coil compensation circuit and the active shielding coil are sequentially connected, wherein,
the magnetic field detection coil is used for detecting a voltage signal sent by the transmitting coil;
the signal conversion device is used for converting the detected voltage signal into a magnetic field signal;
the DSP controller and the unit control circuit are used for controlling the conduction of the active shielding coil according to the magnetic field signal;
and the active shielding coil is controlled to be conducted by the unit control circuit to generate a counteracting magnetic field.
Further, the vision prosthesis wireless power supply system further comprises an eyeshade, and the magnetic field detection coil and the active shielding coil are integrated in the eyeshade.
Furthermore, the magnetic field detection coils are arranged on one side of the eye patch close to the human body and are rectangular or circular, the sizes of the coils in the plurality of coils are the same, and the output ends of the magnetic field detection coils are connected with the signal conversion device positioned outside the eye patch; the active shielding coils are arranged on the outer side of the eyeshade and correspond to the magnetic field detection coils in mounting positions one to one; each active shielding coil is respectively connected with the compensation circuit.
Further, the implanted electric energy receiving end device is implanted in a human body through an operation and comprises a receiving coil, a compensating circuit, a rectifying circuit, an implanted battery, a micro-electrode stimulation controller and a stimulation electrode, wherein the receiving coil, the compensating circuit, the rectifying circuit, the implanted battery, the micro-electrode stimulation controller and the stimulation electrode are connected in sequence, wherein,
the receiving coil is used for inducing a high-frequency voltage in a high-frequency magnetic field;
the compensation circuit is used for compensating the self-inductance of the receiving coil and reducing the inductive reactance of the receiving coil;
the rectifying circuit is used for converting alternating current electric energy into direct current electric energy;
the implantable battery is used for storing electric energy;
the micro-electrode stimulation controller is used for generating a control signal to control the stimulation electrode;
the stimulating electrode is used for repairing the optic nerve.
Further, the compensation circuit adopts series compensation.
Further, the rectification circuit is an uncontrolled rectification circuit.
Based on the above visual prosthesis wireless power supply system with the self-shielding function, the control method comprises the following steps:
And 4, step 4: contrast magnetic field signal BiAnd the maximum limit value B of the magnetic field specified in the international standardmaxIf all the magnetic field signals are smaller than the specified magnetic field maximum limit value, the system leakage magnetic field meets the requirement, and an active shielding coil is not required to be switched on; if the magnetic field signal is larger than the specified magnetic field maximum limit value, the position of the detection coil with the exceeding magnetic field is required to be determined, and then the region with the exceeding magnetic field is determined;
and 5: based on the determined area with the overproof magnetic field, conducting an active shielding coil of the area through a DSP controller and a unit control circuit;
step 6: judging whether all the active shielding coils are opened or not, if the active shielding coils which are not opened exist, repeating the steps from 2 to 5 until all the magnetic field signals are smaller than the specified magnetic field maximum limit value; if all the active shielding coils are conducted, making k equal to k + 1;
and 7: judging whether k is larger than 1, if k is larger than 1, indicating that the leakage magnetic radiation of the system still exceeds the standard when all the active shielding coils are opened, outputting a magnetic field standard exceeding signal at the moment, and closing an E-class amplifier in an external electric energy transmitting end device; and if k is less than or equal to 1, returning to the step 2, and detecting the magnetic field signals in each coil until all the magnetic field signals are less than the specified magnetic field maximum limit value.
Further, the method for converting the voltage signal into the magnetic field signal in step 3 is specifically as follows:
under the environment of a high-frequency magnetic field, the expression of an effective value U of the induced voltage in a single magnetic field detection coil satisfies the following conditions:
U＝ω·Φ＝ω·Bav·S·Nt (1)
where ω denotes the angular frequency of operation of the system, Φ denotes the total magnetic flux passing through the magnetic field detection coil, BavIndicating the average magnetic induction through the magnetic field detection coil, S the area of the detection coil, NtIndicating the number of turns of the detection coil;
therefore, the average magnetic induction passing through the magnetic field detection coil is calculated by:
by the above formula, the voltage signal measured in the magnetic field detection coil is converted into a magnetic field signal.
The main advantages of the invention are: the invention can supply power for the implanted visual prosthesis in a wireless mode, avoids the problems of biological tissue infection, rejection reaction and the like caused by a lead interface in the traditional visual prosthesis adopting a wired charging mode, and reduces the operation risk and the operation cost required to be born by a patient. Meanwhile, the magnetic field detection coil in the system can detect the size of the magnetic leakage radiation of the face in real time in the working process of the system, and controls the active shielding coil to generate a counteracting magnetic field, so that the magnetic field regulation and control are performed, the electromagnetic radiation caused by the facial tissues of a human body and the implanted electronic equipment in the working process of the system is reduced, and the electromagnetic safety of the system is improved. In addition, the active shielding coil adopts an array coil structure, each coil is independently controlled, the modularization of magnetic field regulation and control can be realized, and the electromagnetic radiation overproof area can be accurately controlled.
Drawings
FIG. 1 is a system block diagram of a visual prosthesis wireless power supply system with self-shielding function according to the present invention;
fig. 2 is a schematic structural diagram of an in vitro leakage magnetic field regulation and control device according to the present invention;
fig. 3 is a schematic structural view of a magnetic field detection coil according to the present invention;
FIG. 4 is a schematic structural diagram of an active shielding coil according to the present invention;
fig. 5 is a flowchart of a control method of a visual prosthesis wireless power supply system with a self-shielding function according to the present invention.
Wherein, 1 is an external electric energy transmitting terminal device; 2 is an external leakage magnetic field regulating device; 21 is the outer side surface of the external leakage magnetic field regulating device; 22 is the inner side surface of the external leakage magnetic field regulating and controlling device; 3 is an implanted electric energy receiving end device; 4 is a magnetic field detection coil; and 5, an active shielding coil.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, the visual prosthesis wireless power supply system with self-shielding function according to the present invention comprises three parts, a first part is an external electric energy transmitting terminal device 1, a second part is an external leakage magnetic field regulating device 2, and a third part is an implanted electric energy receiving terminal device 3; the function of the in vitro electric energy transmitting end device 1 is to generate a high-frequency alternating magnetic field in space and transmit energy to the electric energy receiving end device 3; the external leakage magnetic field regulating and controlling device 2 has the functions of detecting and generating a counteracting magnetic field to effectively shield the leakage magnetic field generated by the transmitting coil on the face of the human body and reduce electromagnetic radiation; the implanted electric energy receiving end device 3 is implanted into a human body through an operation, and has the functions of receiving energy and supplying power to the implanted visual prosthesis;
the external electric energy transmitting terminal device 1 comprises a class-E amplifier, a compensating circuit and a transmitting coil; the class-E amplifier is powered by a direct-current power supply, the output end of the class-E amplifier is connected with the compensation circuit, and the class-E amplifier outputs high-frequency voltage with constant amplitude at a MHz level and provides constant power input for the transmitting coil; the output end of the compensation circuit is connected with the transmitting coil, and according to the circuit characteristics of the system, series compensation, parallel compensation and composite compensation can be adopted, and the compensation circuit is used for compensating the self-inductance of the transmitting coil and eliminating the reactive power in the system; meanwhile, the resonance frequency of the compensation network is consistent with the working frequency of the system; the transmitting coil is a round coil or a rectangular coil wound by a plurality of turns of litz wires, and the number of turns of the coil is determined by transmitting current and charging voltage required by an implanted battery; high-frequency current with constant effective value is introduced into the transmitting coil, a high-frequency magnetic field is generated in the space, and power is supplied to the visual prosthesis;
as shown in fig. 2 and fig. 3, the external leakage magnetic field regulation and control device 2 comprises an eyeshade integrated with a magnetic field detection coil 4 and an active shielding coil 5, an external signal conversion device, a DSP controller, a unit control circuit and a shielding coil compensation circuit; the magnetic field detection coil 4 is arranged on the inner surface 22 of the eye shield and is connected with a signal conversion device and a DSP controller outside the eye shield, and voltage signals in the magnetic field detection coil 3 are read and converted into magnetic field signals in the signal conversion device, so that the DSP controller controls the conduction of each coil in the active shielding coil 4 to generate a cancellation magnetic field;
further, the magnetic field detection coil 4 is a plurality of rectangular or circular coils, is mounted on the inner side 22 of the eyeshade, and totally comprises n independent sub-coils, wherein n is a positive integer; the sizes of all the sub-coils are completely the same, and the output ends of the sub-coils are connected with a signal conversion device outside the eyeshade;
as shown in fig. 2 and 4, the active shielding coil 5 is mounted on the outer side 21 of the eyeshade and comprises n independent sub shielding coils, wherein n is a positive integer; the structure of the active shielding coil 5 is a rectangular or circular coil, the structure of the active shielding coil is the same as that of the magnetic field detection coil 4, and the installation position of each sub shielding coil corresponds to the position of the magnetic field detection coil 4; each active shielding coil is respectively connected with a compensation circuit and then connected with a unit control circuit; the control unit circuit is connected in parallel with the output end of the class-E power amplifier, so that the current phase in the active shielding coil 5 is ensured to be in phase with the current phase in the transmitting coil;
furthermore, in the working process of the wireless power supply system, the patient needs to wear an eye shield, so that the functions of magnetic field detection and leakage magnetic field shielding are realized;
the implanted electric energy receiving end device 3 is implanted into a human body through an operation and comprises a receiving coil, a compensating circuit, a rectifying circuit, an implanted battery, a microelectrode stimulation controller and a stimulation electrode; the axis of the receiving coil is parallel to the transmitting coil, and the area of the receiving coil is S and is smaller than that of the transmitting coil; after the transmitting coil generates a magnetic field and induces high-frequency voltage in the receiving coil, the high-frequency voltage is supplied to the implanted battery through the compensating circuit and the rectifying circuit, then a control signal is generated through the microelectrode stimulation controller, and the visual nerve is repaired through the stimulating electrode;
furthermore, the receiving end compensation circuit adopts series compensation, the series compensation is used for compensating the self-inductance of the receiving coil, the inductive reactance of the receiving end is reduced, and the resonant frequency of the compensation circuit is consistent with the working frequency of a system;
furthermore, the rectification circuit is an uncontrolled rectification circuit;
the invention also provides a control method of a visual prosthesis wireless power supply system with a self-shielding function, a flow chart of which is shown in fig. 5, and the control method is characterized in that:
the control method of the visual prosthesis wireless power supply system with the self-shielding function comprises the following 7 basic steps:
step 1: initializing a system, enabling k to be 0, supplying power to an E-type amplifier in an external electric energy transmitting terminal device, and generating a magnetic field by a transmitting coil;
step 2: reading induced voltage value U in each of n magnetic field detection coils1..Ui..UnWherein i is 1,2 … n;
and step 3: the voltage signal U in the magnetic field detection coil is converted by a signal conversion device1..Ui..UnConverted into a magnetic field signal B1..Bi..Bn；
And 4, step 4: contrast magnetic field signal BiAnd the maximum limit value B of the magnetic field specified in the international standardmaxIf all the magnetic field signals are smaller than the specified magnetic field maximum limit value, the system leakage magnetic field meets the requirement, and an active shielding coil is not required to be switched on; if the magnetic field signal is larger than the specified magnetic field maximum limit value, the position of the detection coil with the exceeding magnetic field is required to be determined, and then the region with the exceeding magnetic field is determined;
and 5: based on the determined area with the overproof magnetic field, conducting an active shielding coil of the area through a DSP controller and a unit control circuit;
step 6: judging whether all the active shielding coils are opened or not, if the active shielding coils which are not opened exist, repeating the steps from 2 to 5 until all the magnetic field signals are smaller than the specified magnetic field maximum limit value; if all the active shielding coils are conducted, making k equal to k + 1;
and 7: judging whether k is larger than 1, if k is larger than 1, indicating that the leakage magnetic radiation of the system still exceeds the standard when all the active shielding coils are opened, outputting a magnetic field standard exceeding signal at the moment, and closing an E-class amplifier in an external electric energy transmitting end device; if k is less than or equal to 1, the step 2 is repeated, and the magnetic field signals in each coil are detected until all the magnetic field signals are less than the specified magnetic field maximum limit value;
detailed description of the invention
This embodiment mode will be further described as an embodiment mode. In the control method of the visual prosthesis wireless power supply system with the self-shielding function, the method for converting the voltage signal into the magnetic field signal in the step 3 is concretely as follows
Under the environment of a high-frequency magnetic field, the expression of the effective value U of the induced voltage in a single detection coil satisfies the following conditions:
U＝ω·Φ＝ω·Bav·S·Nt (3)
where ω denotes the angular frequency of operation of the system, Φ denotes the total magnetic flux passing through the magnetic field detection coil, BavIndicating the average magnetic induction through the magnetic field detection coil, S the area of the detection coil, NtIndicating the number of turns of the detection coil;
therefore, the average magnetic induction through the detection coil can be calculated by:
the voltage signal measured in the detection coil can be converted into a magnetic field signal by the above formula.
Claims (10)
1. A visual prosthesis wireless power supply system with a self-shielding function comprises an implanted visual prosthesis and is characterized in that the visual prosthesis wireless power supply system comprises an external electric energy transmitting end device (1), an external leakage magnetic field regulating and controlling device (2) and an implanted electric energy receiving end device (3), wherein,
the external electric energy transmitting end device (1) is used for generating a high-frequency alternating magnetic field in space and transmitting energy to the implanted electric energy receiving end device (3);
the external leakage magnetic field regulating and controlling device (2) is used for detecting and generating a counteracting magnetic field so as to shield the leakage magnetic field generated by the external electric energy transmitting end device (1) on the face of a human body and reduce electromagnetic radiation;
the implanted electric energy receiving end device (3) is used for receiving the energy emitted by the external electric energy emitting end device (1) and supplying power to the implanted visual prosthesis.
2. The wireless power supply system of visual prosthesis with self-shielding function according to claim 1, wherein said external electric energy transmitting terminal device (1) comprises a class E amplifier, a compensation circuit and a transmitting coil, the output terminal of said class E amplifier is connected with said compensation circuit, the output terminal of said compensation circuit is connected with said transmitting coil, wherein,
the class-E amplifier is used for outputting high-frequency voltage at the level of MHz;
the compensation circuit is used for compensating the self-inductance of the transmitting coil and eliminating the reactive power in the system;
the transmitting coil is used for exciting a high-frequency magnetic field in the space after high-frequency current is introduced.
3. The wireless power supply system of visual prosthesis with self-shielding function according to claim 1, wherein said external leakage magnetic field regulation and control device (2) comprises an active shielding coil (5), a magnetic field detection coil (4), a signal conversion device, a DSP controller, a unit control circuit and a shielding coil compensation circuit, said magnetic field detection coil (4), said signal conversion device, said DSP controller, said unit control circuit, said shielding coil compensation circuit and said active shielding coil (5) are connected in sequence, wherein,
the magnetic field detection coil (4) is used for detecting a voltage signal sent by the transmitting coil;
the signal conversion device is used for converting the detected voltage signal into a magnetic field signal;
the DSP controller and the unit control circuit are used for controlling the conduction of the active shielding coil (5) according to the magnetic field signal;
and the active shielding coil (5) is controlled to be conducted by the unit control circuit to generate a counteracting magnetic field.
4. A visual prosthesis wireless power supply system with self-shielding function according to claim 3, characterized in that it further comprises an eye mask, in which the magnetic field detection coil (4) and the active shielding coil (5) are integrated.
5. The wireless power supply system for visual prosthesis with self-shielding function according to claim 4, wherein said magnetic field detection coil (4) is provided in plurality, and is installed on one side of said eye mask close to human body, and is rectangular or circular, each coil of said plurality of coils has the same size, and the output end of said magnetic field detection coil (4) is connected to said signal conversion device located outside said eye mask; a plurality of active shielding coils (5) are arranged and are all arranged on the outer side of the eyeshade, and the active shielding coils (5) correspond to the magnetic field detection coils (4) in one-to-one mode; each active shielding coil (5) is connected with the compensation circuit.
6. The wireless power supply system of visual prosthesis with self-shielding function according to claim 1, wherein the implanted power receiving end device (3) is implanted inside human body by operation, and comprises a receiving coil, a compensating circuit, a rectifying circuit, an implanted battery, a micro-electrode stimulation controller and a stimulation electrode, wherein the receiving coil, the compensating circuit, the rectifying circuit, the implanted battery, the micro-electrode stimulation controller and the stimulation electrode are connected in sequence, wherein,
the receiving coil is used for inducing a high-frequency voltage in a high-frequency magnetic field;
the compensation circuit is used for compensating the self-inductance of the receiving coil and reducing the inductive reactance of the receiving coil;
the rectifying circuit is used for converting alternating current electric energy into direct current electric energy;
the implantable battery is used for storing electric energy;
the micro-electrode stimulation controller is used for generating a control signal to control the stimulation electrode;
the stimulating electrode is used for repairing the optic nerve.
7. The wireless power supply system for visual prosthesis with self-shielding function according to claim 6, wherein the compensation circuit adopts series compensation.
8. The wireless power supply system for visual prosthesis with self-shielding function according to claim 6, wherein the rectification circuit is an uncontrolled rectification circuit.
9. A control method of a visual prosthesis wireless power supply system with a self-shielding function, which is based on any one of claims 1-8, and is characterized in that the control method comprises the following steps:
step 1, initializing a system, enabling k to be 0, supplying power to an E-type amplifier in an external electric energy transmitting terminal device (1), and generating a magnetic field by a transmitting coil, wherein k represents a calculation step length and satisfies the condition that k is 0,1,2 and 3 …;
step 2, reading the induced voltage value U in each coil of the n magnetic field detection coils (4)1..Ui..UnWherein i is 1,2 … n;
step 3, detecting the voltage signal U in the coil (4) through the signal conversion device1..Ui..UnConverted into a magnetic field signal B1..Bi..Bn；
And 4, step 4: contrast magnetic field signal BiAnd the maximum limit value B of the magnetic field specified in the international standardmaxIf all the magnetic field signals are smaller than the specified magnetic field maximum limit value, the system leakage magnetic field meets the requirement, and an active shielding coil (5) is not required to be opened; if the magnetic field signal is larger than the specified magnetic field maximum limit value, the position of the detection coil with the exceeding magnetic field is required to be determined, and then the region with the exceeding magnetic field is determined;
and 5: based on the determined area with the overproof magnetic field, conducting an active shielding coil (5) of the area through a DSP controller and a unit control circuit;
step 6: judging whether all the active shielding coils (5) are opened or not, if the active shielding coils (5) which are not opened exist, repeating the steps from 2 to 5 until all the magnetic field signals are smaller than the specified magnetic field maximum limit value; if all the active shielding coils (5) are conducted, making k equal to k + 1;
and 7: judging whether k is larger than 1, if k is larger than 1, indicating that the system leakage magnetic radiation still exceeds the standard when all the active shielding coils (5) are opened, outputting a magnetic field standard exceeding signal, and closing an E-class amplifier in the external electric energy transmitting end device (1); and if k is less than or equal to 1, returning to the step 2, and detecting the magnetic field signals in each coil until all the magnetic field signals are less than the specified magnetic field maximum limit value.
10. The method for controlling the visual prosthesis wireless power supply system with the self-shielding function according to claim 9, wherein the method for converting the voltage signal into the magnetic field signal in the step 3 is specifically as follows:
under the high-frequency magnetic field environment, the expression of the effective value U of the induced voltage in the single magnetic field detection coil (4) satisfies the following conditions:
U＝ω·Φ＝ω·Bav·S·Nt (1)
where ω denotes the angular frequency of operation of the system, Φ denotes the total magnetic flux passing through the magnetic field detection coil (4), BavIndicating the average magnetic induction through the magnetic field detection coil (4), S the area of the detection coil, NtIndicating the number of turns of the detection coil;
therefore, the average magnetic induction passing through the magnetic field detection coil (4) is calculated by the following formula:
the voltage signal measured in the magnetic field detection coil (4) is converted into a magnetic field signal by the above formula.
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| US5935155A (en) * | 1998-03-13 | 1999-08-10 | John Hopkins University, School Of Medicine | Visual prosthesis and method of using same |
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