CN119587892A - Magnetic stimulation system with controllable stimulation area - Google Patents
Magnetic stimulation system with controllable stimulation area Download PDFInfo
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Abstract
本发明公开了一种刺激区域可控的磁刺激系统，涉及医疗器械使用技术领域，所述系统包括磁场发生模块、可调磁场模块、控制模块；所述磁场发生模块是由主电路与一级线圈连接构成脉冲磁场发生电路，通过控制主电路对一级线圈的放电过程，将储存在电路中的能量以脉冲形式释放到一级线圈中，从而产生脉冲磁场；所述可调磁场模块在一级线圈的外围设置一个二级线圈并连接相应的调控电路，通过调控电路的控制，二级线圈产生与一级圈磁场方向相反且强度可调的磁场；所述控制模块根据用户体感反馈，通过调控电路控制二级线圈的磁场强度，使二级线圈产生的磁场逐层抵消一级线圈外圈的磁场，实现对一级线圈磁场范围的调控。
The invention discloses a magnetic stimulation system with controllable stimulation area, which relates to the technical field of medical device use. The system comprises a magnetic field generating module, an adjustable magnetic field module and a control module. The magnetic field generating module is a pulse magnetic field generating circuit formed by connecting a main circuit and a primary coil. By controlling the discharge process of the main circuit to the primary coil, the energy stored in the circuit is released to the primary coil in the form of pulses, thereby generating a pulse magnetic field. The adjustable magnetic field module is provided with a secondary coil on the periphery of the primary coil and is connected to a corresponding control circuit. Through the control of the control circuit, the secondary coil generates a magnetic field with an adjustable intensity and a direction opposite to the magnetic field of the primary coil. The control module controls the magnetic field intensity of the secondary coil through the control circuit according to the user's body sensory feedback, so that the magnetic field generated by the secondary coil offsets the magnetic field of the outer circle of the primary coil layer by layer, thereby realizing the control of the magnetic field range of the primary coil.
Description
Technical Field
The invention relates to the technical field of medical instrument use, in particular to a magnetic stimulation system with a controllable stimulation area.
Background
In the technical field of medical appliance use, pelvic floor magnetic stimulation is widely applied to treatment of pelvic floor dysfunction diseases as a non-invasive physical treatment method, and the technology is based on Faraday electromagnetic induction principle, and a high-voltage and high-energy current is used for instantaneously discharging in a magnetic field coil to induce a high-field-intensity magnetic field to act on human tissues so as to generate induced current in the human tissues and stimulate pelvic floor nerves and muscles, thereby inducing a series of physiological and biochemical reactions and achieving the treatment purpose. The magnetic stimulation technology has strong penetrability, can stimulate deeper muscles and nerves, has relatively wide stimulation range, and has obvious advantages in the aspect of treating pelvic floor dysfunction diseases. However, there are still some problems to be solved in the existing magnetic stimulation technology.
Firstly, the stimulation range of magnetic stimulation is relatively difficult to control accurately, compared with electric stimulation, the stimulation range of magnetic stimulation is wider, the whole pelvic floor nerve and muscles can be stimulated, not only the muscles and nerves around the electrode, but also discomfort of a non-treatment area can be caused at the same time as the non-specific stimulation mode is helpful for treatment. As the magnetic field strength increases, the discomfort of the non-treated area increases, thereby affecting the patient's therapeutic experience and effect.
Secondly, the anatomical structure and physiological characteristics of the pelvic floor of different patients are different, namely the layering of the pelvic floor comprises an external pelvic floor layer, a middle pelvic floor layer and an internal pelvic floor layer, the muscular tissue, fascia distribution, fat content and the like of each layer are different, and the anatomical structure difference leads to large difference of unnecessary stimulation areas of different patients. Therefore, how to adjust the magnetic stimulation range according to the individual differences of patients to achieve more accurate and personalized treatment becomes an important challenge for the current magnetic stimulation technology.
Disclosure of Invention
The invention aims to provide a magnetic stimulation system with controllable stimulation area, which solves the problems in the prior art.
In order to achieve the aim, the invention provides the technical scheme that the magnetic stimulation system with controllable stimulation area comprises a magnetic field generation module, an adjustable magnetic field module and a control module;
The magnetic field generating module is a pulse magnetic field generating circuit formed by connecting a main circuit with a primary coil, and energy stored in the circuit is released into the primary coil in a pulse mode by controlling the discharging process of the main circuit to the primary coil so as to generate a pulse magnetic field;
The adjustable magnetic field module is characterized in that a secondary coil is arranged on the periphery of the primary coil and connected with a corresponding regulating circuit, and the secondary coil generates a magnetic field which is opposite to the primary coil in magnetic field direction and has adjustable strength through the control of the regulating circuit;
the control module adjusts and controls the magnetic field range of the primary coil according to the user somatosensory feedback, and controls the magnetic field intensity of the secondary coil through the adjusting and controlling circuit, so that the magnetic field generated by the secondary coil counteracts the magnetic field of the outer ring of the primary coil layer by layer, and the adjustment and control of the magnetic field range of the primary coil is realized.
Further, the primary coil L1 in the magnetic field generating module is an inductance formed by a plurality of turns of copper wires, the main circuit includes a switch S, a high-voltage power supply V, a pulse capacitor C, a diode D, a thyristor T and a resistor Rf, a first end of the switch S is connected to a positive electrode of the power supply V, a second end of the switch S is connected to a first end of the thyristor T, a second end of the thyristor T is connected to a first end of the loop equivalent impedance structure Rf, a second end of the resistor Rf is connected to a first end of the primary coil L1, a second end of the primary coil L1 is connected to a first end of the pulse capacitor C, a second end of the pulse capacitor C is connected to a second end of the switch S, a first end of the diode D is connected to a second end of the pulse capacitor C, and a second end of the diode D is connected to a first end of the resistor Rf;
The primary coil is disconnected after the pulse capacitor C is charged to a preset voltage through a high-voltage V power supply, the control module controls the silicon controlled rectifier T to discharge the primary coil L1, so that a pulse magnetic field is generated, and the magnetic stimulation intensity of the primary coil gradually decreases from the inner ring to the outer ring layer by layer.
In the technical scheme, the energy stored in the circuit can be efficiently released into the primary coil in a pulse mode by controlling the discharging process of the primary coil by the main circuit, so that a strong pulse magnetic field is generated, and the magnetic stimulation intensity generated by the primary coil can be accurately regulated due to the controllable charging voltage and discharging process of the pulse capacitor, so that the requirements of different application scenes are met.
Further, the secondary coil in the adjustable magnetic field module is an inductance formed by a plurality of circles of copper wires, when the current in the primary coil L1 changes, the secondary coil L2 generates an induced current according to Faraday's law of electromagnetic induction, the direction of the induced current is opposite to the current in the primary coil L1 according to Lenz's law, and the relation between the induced current in the secondary coil L2 and the current in the primary coil L1 is as follows:
Wherein i 2 is the induction current in the secondary coil, i 1 is the current in the primary coil, r 2 is the resistance of the secondary coil, L s2 is the inductance of the secondary coil, M is the mutual inductance between the primary coil and the secondary coil, jw is the angular frequency of the alternating current, r 2＞＞jwLs2 is the resistance of the secondary coil is far greater than the inductance under the low frequency condition according to the above formula, therefore the inductance term in the above formula can be ignored, and the induction current in the secondary coil is simplified to Indicating that at low frequencies, the induced current in the secondary coil is mainly determined by the resistance in the secondary coil and the current in the primary coil, and the induced current i 2 is proportional to the current i 1 in the primary coil L1, so that the control of the magnetic field distribution range of the primary coil can be changed by adjusting the current in the secondary coil.
The adjustable magnetic field module comprises a current path and magnetic field intensity of a secondary coil, a bidirectional thyristor T1 and a bidirectional thyristor T2, a load resistor Rf1, an energy storage capacitor C1, a current limiting resistor Rc, a standby high-voltage power supply V1 and two control switches S1 and S2, wherein the current limiting resistor Rc is used for limiting the current of the standby high-voltage power supply V1 through the energy storage capacitor C1, the first end of the secondary coil L2 is connected with the first end of the bidirectional thyristor T1, the second end of the secondary coil L2 is connected with the first end of the bidirectional thyristor T2, the second end of the bidirectional thyristor T1 is connected with the first end of the load resistor Rf1, the second end of the load resistor Rf1 is connected with the first end of the energy storage capacitor C1, the second end of the energy storage capacitor C1 is connected with the second end of the bidirectional thyristor T2, the first end of the control switch S1 is connected with the second end of the load resistor C1, and the second end of the standby high-voltage power supply V is connected with the first end of the standby high-voltage power supply V1.
According to the technical scheme, the secondary coil can generate the magnetic field with the opposite direction to the magnetic field of the primary coil and the adjustable strength through the control of the control circuit, so that the accurate adjustment of the magnetic field strength of the primary coil is realized, the application range of magnetic stimulation can be further expanded through adjusting the magnetic field generated by the secondary coil, and the magnetic stimulation strength is reduced to relieve discomfort of a patient.
Further, the control module comprises a main control board unit, a singlechip unit, a detection unit, a magnetic field intensity calculation unit, a magnetic field intensity control unit and a regulation and control unit, wherein the main control board unit provides an input interface for inputting corresponding control instructions according to somatosensory feedback of a user, the detection unit is used for monitoring currents and magnetic field intensities of the primary coil and the secondary coil L2 in real time and feeding data back to the singlechip unit, and the singlechip unit is used for receiving the control instructions input by the user and judging whether to adjust the magnetic field intensity or the action range of the magnetic field according to the detection result of the detection unit.
When the primary coil L1 generates exciting current i 1, the secondary coil L2 generates induced current i 2 according to the mutual inductance characteristic, and the relation between the induced current i 2 and the exciting current i 1 is as follows:
Wherein N 1 and N 2 are the number of turns of the primary coil L1 and the secondary coil L2, respectively;
At this time, the magnetic induction intensity generated by the secondary coil is B 2:
Wherein mu 2 is the magnetic permeability of the secondary coil L2, and L e2 is the magnetic path length of the secondary coil L2;
The magnetic induction intensity of the primary coil is B 1:
where μ 1 is the magnetic permeability of the primary coil L1, and L e1 is the magnetic path length of the primary coil L1.
The magnetic field intensity control unit obtains magnetic induction intensities B 1 and B 2 of a primary coil L1 and a secondary coil L2 through the magnetic field intensity calculation unit to obtain a suppressed magnetic induction intensity value B=B 1-B2, enhances and reduces the magnetic induction intensity B 2 by controlling exciting current of the secondary coil L2, and realizes current magnitude and direction conversion of i 2 by controlling charge and discharge of the secondary coil L2 through an energy storage capacitor C1, wherein when the current direction of i 2 is in the same direction as i 1, the magnetic field intensity is enhanced and is expressed as B=B1+B2.
The control unit adjusts an interference magnetic field of the secondary coil by controlling the main circuit and the control circuit, when the secondary coil L2 does not generate induced current, the pre-charging operation is carried out, the primary coil L1 charges the energy storage capacitor C1 in advance through the magnetic field generated by the primary coil L1, the secondary coil L2 synchronously controls the standby high-voltage power supply V1 to pre-charge the energy storage capacitor C1, the switch S2 is disconnected after the voltage of the energy storage capacitor C1 reaches a set voltage value, the pre-charging operation is stopped, when the secondary coil L2 generates the induced current, the magnetic field adjustment stage is carried out, the intensity of the interference magnetic field generated by the secondary coil L2 is adjusted by controlling the conduction polarities of the bidirectional thyristors T1 and T2, when the control switch S1 is disconnected, the induced current generated by the primary coil L1 charges the energy storage capacitor C1 again, the primary coil L1 and the energy storage capacitor C1 form an oscillation circuit, and the control of the magnetic field intensity of the secondary coil L2 is realized by adjusting the preset voltage value of the energy storage capacitor C1.
According to the technical scheme, the control module achieves intelligent control of the whole system through the singlechip, the magnetic field intensity and the range can be automatically adjusted according to somatosensory feedback and real-time monitoring data of a user, the magnetic induction intensity generated by the primary coil and the secondary coil can be accurately calculated through the magnetic field intensity calculation unit, accurate data support is provided for adjusting the magnetic field intensity and the range, the magnetic field intensity control unit achieves dynamic adjustment of the magnetic field intensity by controlling the induction current of the secondary coil and the charging and discharging process of the energy storage capacitor according to the calculated magnetic induction intensity value, the effect of magnetic stimulation can be further optimized through accurate calculation and dynamic adjustment of the magnetic field intensity, the accuracy of magnetic stimulation is improved, and discomfort in the magnetic stimulation process is reduced.
Compared with the prior art, the invention has the beneficial effects that:
the invention can adjust the magnetic stimulation range in real time according to the somatosensory feedback of the user, input corresponding control instructions through the control interface, and receive and process the instructions by the singlechip unit, thereby realizing the accurate control of the magnetic stimulation range and the intensity.
The invention not only can adjust the intensity of magnetic stimulation by controlling the discharge process of the primary coil, but also can offset the magnetic field of the outer ring of the primary coil layer by adjusting the magnetic field intensity of the secondary coil, thereby realizing the accurate control of the magnetic stimulation area.
Drawings
FIG. 1 is a system flow diagram of a magnetic stimulation system with controllable stimulation zone in accordance with the present invention;
FIG. 2 is a schematic diagram of a coil structure of a magnetic stimulation system with controllable stimulation area according to the present invention;
fig. 3 is a diagram of a pulse magnetic field generating circuit and a secondary coil magnetic field regulating circuit of a magnetic stimulation system with controllable stimulation area according to the present invention.
Detailed Description
All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
1-3, The invention provides a magnetic stimulation system with controllable stimulation area, which comprises a magnetic field generation module, an adjustable magnetic field module and a control module;
The magnetic field generating module is a pulse magnetic field generating circuit formed by connecting a main circuit with a primary coil, and energy stored in the circuit is released into the primary coil in a pulse mode by controlling the discharging process of the main circuit to the primary coil so as to generate a pulse magnetic field;
The adjustable magnetic field module is characterized in that a secondary coil is arranged on the periphery of the primary coil and connected with a corresponding regulating circuit, and the secondary coil generates a magnetic field which is opposite to the primary coil in magnetic field direction and has adjustable strength through the control of the regulating circuit;
the control module adjusts and controls the magnetic field range of the primary coil according to the user somatosensory feedback, and controls the magnetic field intensity of the secondary coil through the adjusting and controlling circuit, so that the magnetic field generated by the secondary coil counteracts the magnetic field of the outer ring of the primary coil layer by layer, and the adjustment and control of the magnetic field range of the primary coil is realized.
As shown in a pulse magnetic field generating circuit in fig. 2, a primary coil L1 in the magnetic field generating module is an inductance formed by a plurality of circles of copper wires, the main circuit comprises a switch S, a high-voltage power supply V, a pulse capacitor C, a diode D, a silicon controlled rectifier T and a resistor Rf, wherein the highest working voltage of the pulse capacitor C is 2000V, the maximum pulse current is 5000A, the capacitance value is 140 μf, a first end of the switch S is connected with a positive electrode of the power supply V, a second end of the switch S is connected with a first end of the silicon controlled rectifier T, a second end of the silicon controlled rectifier T is connected with a first end of a loop equivalent impedance structure Rf, a second end of the resistor Rf is connected with a first end of the primary coil L1, a second end of the primary coil L1 is connected with a first end of the pulse capacitor C, a second end of the pulse capacitor C is connected with a second end of the switch S, a first end of the diode D is connected with a second end of the pulse capacitor C, and a second end of the diode D is connected with a first end of the resistor Rf;
The primary coil is disconnected after the pulse capacitor C is charged to a preset voltage through a high-voltage V power supply, the control module controls the silicon controlled rectifier T to discharge the primary coil L1, so that a pulse magnetic field is generated, and the magnetic stimulation intensity of the primary coil gradually decreases from the inner ring to the outer ring layer by layer.
In the technical scheme, the energy stored in the circuit can be efficiently released into the primary coil in a pulse mode by controlling the discharging process of the primary coil by the main circuit, so that a strong pulse magnetic field is generated, and the magnetic stimulation intensity generated by the primary coil can be accurately regulated due to the controllable charging voltage and discharging process of the pulse capacitor, so that the requirements of different application scenes are met.
The secondary coil in the adjustable magnetic field module is an inductor formed by a plurality of circles of copper wires, when the current in the primary coil L1 changes, the secondary coil L2 generates induced current according to Faraday electromagnetic induction law, the direction of the induced current is opposite to the current in the primary coil L1 according to Lenz's law, and the relation between the induced current in the secondary coil L2 and the induced current of the primary coil L1 is as follows:
Wherein i 2 is the induction current in the secondary coil, i 1 is the current in the primary coil, r 2 is the resistance of the secondary coil, L s2 is the inductance of the secondary coil, M is the mutual inductance between the primary coil and the secondary coil, jw is the angular frequency of the alternating current, r 2＞＞jwLs2 is the resistance of the secondary coil is far greater than the inductance under the low frequency condition according to the above formula, therefore the inductance term in the above formula can be ignored, and the induction current in the secondary coil is simplified to Indicating that at low frequencies, the induced current in the secondary coil is mainly determined by the resistance in the secondary coil and the current in the primary coil, and the induced current i 2 is proportional to the current i 1 in the primary coil L1, so that the control of the magnetic field distribution range of the primary coil can be changed by adjusting the current in the secondary coil.
The magnetic field regulation circuit of the secondary coil in fig. 2 is used for controlling the current path and the magnetic field intensity of the secondary coil, and comprises bidirectional thyristors T1 and T2, a load resistor Rf1, an energy storage capacitor C1, a current limiting resistor Rc, a standby high-voltage power supply V1 and two control switches S1 and S2, wherein the load resistor Rf1 is the equivalent impedance of C1-T1-T2-S1, the current limiting resistor Rc is used for limiting the current of the standby high-voltage power supply V1 through the energy storage capacitor C1, the first end of the secondary coil L2 is connected with the first end of the bidirectional thyristor T1, the second end of the secondary coil L2 is connected with the first end of the bidirectional thyristor T2, the second end of the bidirectional thyristors T1 is connected with the first end of the load resistor Rf1, the second end of the energy storage capacitor C1 is connected with the second end of the energy storage capacitor C1, the second end of the control switch S1 is connected with the second end of the load resistor C1, and the second end of the load resistor C1 is connected with the second end of the load resistor C1, the second end of the load resistor C1 is connected with the second end of the load resistor C2, and the second end of the load resistor C1 is connected with the second end of the load resistor C1.
According to the technical scheme, the secondary coil can generate the magnetic field with the opposite direction to the magnetic field of the primary coil and the adjustable strength through the control of the control circuit, so that the accurate adjustment of the magnetic field strength of the primary coil is realized, the application range of magnetic stimulation can be further expanded through adjusting the magnetic field generated by the secondary coil, and the magnetic stimulation strength is reduced to relieve discomfort of a patient.
The control module comprises a main control board unit, a singlechip unit, a detection unit, a magnetic field intensity calculation unit, a magnetic field intensity control unit and a regulation and control unit, wherein the main control board unit provides an input interface for inputting corresponding control instructions according to somatosensory feedback of a user, the detection unit is used for monitoring current and magnetic field intensity of a primary coil and a secondary coil L2 in real time and feeding data back to the singlechip unit, and the singlechip unit is used for receiving the control instructions input by the user and judging whether to adjust the magnetic field intensity or the action range of the magnetic field according to the detection result of the detection unit.
When the primary coil L1 generates exciting current i 1, the secondary coil L2 generates induced current i 2 according to the mutual inductance characteristic, and the relation between the induced current i 2 and the exciting current i 1 is as follows:
Wherein N 1 and N 2 are the number of turns of the primary coil L1 and the secondary coil L2, respectively;
At this time, the magnetic induction intensity generated by the secondary coil is B 2:
Wherein mu 2 is the magnetic permeability of the secondary coil L2, and L e2 is the magnetic path length of the secondary coil L2;
The magnetic induction intensity of the primary coil is B 1:
where μ 1 is the magnetic permeability of the primary coil L1, and L e1 is the magnetic path length of the primary coil L1.
The magnetic field intensity control unit obtains magnetic induction intensities B 1 and B 2 of a primary coil L1 and a secondary coil L2 through the magnetic field intensity calculation unit to obtain a suppressed magnetic induction intensity value B=B 1-B2, enhances and reduces the magnetic induction intensity B 2 by controlling exciting current of the secondary coil L2, and realizes current magnitude and direction conversion of i 2 by controlling charge and discharge of the secondary coil L2 through an energy storage capacitor C1, wherein when the current direction of i 2 is in the same direction as i 1, the magnetic field intensity is enhanced and is expressed as B=B1+B2.
The control unit adjusts an interference magnetic field of the secondary coil by controlling the main circuit and the control circuit, when the secondary coil L2 does not generate induced current, the pre-charging operation is carried out, the primary coil L1 charges the energy storage capacitor C1 in advance through the magnetic field generated by the primary coil L1, the secondary coil L2 synchronously controls the standby high-voltage power supply V1 to pre-charge the energy storage capacitor C1, the switch S2 is disconnected after the voltage of the energy storage capacitor C1 reaches a set voltage value, the pre-charging operation is stopped, when the secondary coil L2 generates induced current, the magnetic field adjustment stage is carried out, the direction and the magnitude of current in the secondary coil L2 are adjusted by controlling the conduction polarity of the bidirectional thyristors T1 and T2, so that the intensity of the interference magnetic field generated by the secondary coil L2 is changed, when the switch S1 is controlled to be disconnected, the induced current generated by the primary coil L1 charges the energy storage capacitor C1 again, and the oscillation circuit is formed between the primary coil L1 and the energy storage capacitor C1.
According to the technical scheme, the control module achieves intelligent control of the whole system through the singlechip, the magnetic field intensity and the range can be automatically adjusted according to somatosensory feedback and real-time monitoring data of a user, the magnetic induction intensity generated by the primary coil and the secondary coil can be accurately calculated through the magnetic field intensity calculation unit, accurate data support is provided for adjusting the magnetic field intensity and the range, the magnetic field intensity control unit achieves dynamic adjustment of the magnetic field intensity by controlling the induction current of the secondary coil and the charging and discharging process of the energy storage capacitor according to the calculated magnetic induction intensity value, the effect of magnetic stimulation can be further optimized through accurate calculation and dynamic adjustment of the magnetic field intensity, the accuracy of magnetic stimulation is improved, and discomfort in the magnetic stimulation process is reduced.
The system comprises a patient ready to receive basin bottom magnetic stimulation treatment, a doctor firstly sets a required magnetic stimulation area and strength according to the condition of the patient, and inputs related control instructions into a main control board;
The working stage of the primary coil:
The primary coil L1 is discharged by controlling the switch of the silicon controlled rectifier T so as to generate a pulse magnetic field which can cover the whole basin bottom area but possibly exceeds the range required by treatment, at the stage, the control switch S1 is closed, the secondary coil L2 does not start working yet, and a doctor inquires about the feeling of a patient about magnetic stimulation and judges whether the stimulation area or intensity needs to be adjusted;
and a secondary coil adjusting stage:
If the patient needs a more accurate stimulation area or lower stimulation intensity, a doctor sends an instruction through the main control board unit to start the work of the secondary coil L2, and at the moment, the standby high-voltage power supply V1 pre-charges the energy storage capacitor C1 to prepare for the induced current of the secondary coil L2, the magnetic field generated by the primary coil L1 generates the induced current in the secondary coil L2, and the direction of the induced current is opposite to the direction of the current in the primary coil L1, so that a magnetic field opposite to the direction of the magnetic field of the primary coil is generated;
The magnetic field intensity control unit adjusts the intensity of an interference magnetic field generated by the secondary coil L2 by controlling the conduction polarity of the bidirectional thyristors T1 and T2 according to the difference value of the B1 and the B2, so that the B2 counteracts the outer ring magnetic field of the B1 layer by layer, thereby realizing the accurate regulation and control of the magnetic field range of the primary coil L1;
Detection and adjustment stage:
the detection circuit can monitor the current and the magnetic field intensity of the secondary coil L2 in real time and feed data back to the singlechip unit, the singlechip unit judges whether the magnetic field intensity or the magnetic field area needs to be further regulated according to the detection result, if the magnetic field intensity or the magnetic field area needs to be regulated, the singlechip unit can send an instruction again to regulate the current and the magnetic field intensity of the secondary coil L2, when the expected magnetic stimulation effect is achieved, a doctor can end the treatment process through the main control board unit, at the moment, the system enters a closing stage of the regulating function of the secondary coil, and all equipment is restored to an initial state.
It should be noted that the above-mentioned embodiments are merely preferred embodiments of the present invention, and the present invention is not limited thereto, but may be modified or substituted for some of the technical features thereof by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
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