Electrostatic processing device

Abstract

The utility model relates to an electrostatic processing device, comprising a digital isolation circuit which is arranged between a first processor of an application part of medical electrical equipment and a second processor of a non-application part of the medical electrical equipment so as to carry out signal transmission and electrically isolate the first processor from the second processor; the power supply isolation circuit is arranged between a first power supply of the application part and a second power supply of the non-application part so as to electrically isolate the first power supply from the second power supply; and one end of the safety capacitor is connected with the floating end of the application part, and the other end of the safety capacitor is connected with the grounding end of the non-application part so as to release electrostatic charges generated by the application part and block power frequency signals. The electrostatic processing device can realize electrical isolation while ensuring effective signal transmission between the application part and the non-application part, and can release electrostatic charges, thereby improving the application safety and reliability of medical electrical equipment.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of static treatment, specifically relates to a static treatment device. BACKGROUND

[0002] In the medical field, part of the medical electrical equipment (for example, electrocardiograph) usually includes application part and non-application part, the application part will contact with the patient's body. In order to protect the safety of patients, usually adopt isolation circuit to carry out floating ground processing, to prevent accidental electric shock injury. However, this design exposes the defect in electrostatic discharge (ESD) test. Because the application part is floating ground, charge cannot be released through the ground return circuit, resulting in charge accumulation that may cause device logic abnormality, even breakdown isolation circuit, cause equipment failure. The current GB / T 17626.2-2018 standard requires that the equipment is subjected to ESD test to evaluate its electromagnetic compatibility. But the existing equipment is vulnerable in direct and indirect discharge test, which affects the performance of the equipment and the safety of patients.

[0003] Therefore, a technical scheme is needed to solve the stability and safety problems of medical electrical equipment in ESD test and improve the reliability of the equipment. UTILITY MODEL CONTENT

[0004] In view of the above defects or improvement needs of the prior art, the utility model provides a static treatment device, which can realize electrical isolation while ensuring effective signal transmission between the application part and the non-application part, and can release static charge, thereby improving the application safety and reliability of the medical electrical equipment.

[0005] Specifically, the utility model is realized by the following technical schemes:

[0006] Firstly, the utility model provides a static treatment device for medical electrical equipment, the medical electrical equipment includes application part and non-application part, the application part is floating ground, and the non-application part is grounded, the static treatment device includes: digital isolation circuit, which is arranged between the first processor of the application part and the second processor of the non-application part to transmit signals and electrically isolate the first processor from the second processor;Power isolation circuit, which is arranged between the first power supply of the application part and the second power supply of the non-application part to electrically isolate the first power supply from the second power supply;And the safety capacitor, one end of which is connected with the floating ground end of the application part, and the other end is connected with the ground end of the non-application part, to release the static charge generated by the application part and block the power frequency signal.

[0007] Further, the static treatment device further includes: high-voltage resistor, which is connected in parallel with the safety capacitor, for releasing the direct current voltage generated by static charge accumulation.

[0008] Further, the digital isolation circuit comprises an optocoupler and a first protection part, and the first protection part is arranged between the optocoupler and the second processor.

[0009] Further, the digital isolation circuit comprises a magnetic coupling isolator or a capacitive coupling isolator and a second protection part, and the second protection part is arranged between the digital isolation circuit and the second processor.

[0010] Further, the first protection part is configured in a common mode inductance manner to consume electrostatic charges generated by the application part.

[0011] Further, the second protection part is configured in a combination of common mode inductance and ferrite bead filter to consume electrostatic charges generated by the application part.

[0012] Further, the electrostatic treatment device is arranged in an electrically isolated area, and the electrically isolated area is electrically isolated from the outside.

[0013] Further, the application part is in contact with a patient.

[0014] Further, the electrostatic treatment device further comprises an electrostatic guiding component, and the electrostatic guiding component is electrically connected with the safety capacitor to guide electrostatic charges of the application part to the safety capacitor.

[0015] Further, the ferrite bead filter releases energy by heat conversion to protect a communication interface of the magnetic coupling isolator or the capacitive coupling isolator.

[0016] The electrostatic treatment device provided by the utility model can realize electric isolation while ensuring effective signal transmission between the application part and the non-application part, and can release electrostatic charges, thereby improving the application safety and reliability of the electric equipment. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the utility model or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or the prior art description. Obviously, the drawings in the following description are some embodiments of the utility model, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0018] Figure 1 is the structure block diagram of the electrostatic treatment device according to the embodiment of the utility model and arranged between the application part and the non-application part of the medical electric equipment;

[0019] Figure 2 is a first schematic diagram of a digital isolation circuit of an electrostatic treatment device according to an embodiment of the present application;

[0020] Figure 3 is a second schematic diagram of a digital isolation circuit of an electrostatic treatment device according to an embodiment of the present application.

[0021] Reference signs:

[0022] 100, electrostatic treatment device; 110, digital isolation circuit; 120, power isolation circuit; 130, safety capacitor; 140, high-voltage resistor; 121, optical coupling isolator; 122, magnetic coupling isolator or capacitive coupling isolator; 123, first protection part; 124, second protection part; DETAILED DESCRIPTION

[0023] In order to make the purpose, technical scheme and advantages of the present application clearer, the technical scheme of the present application will be described below in combination with the drawings in the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0024] Before describing the electrostatic treatment device of the present application, the characteristics of medical electrical equipment need to be explained. Medical electrical equipment (for example, an electrocardiograph or an electroencephalograph) can generally include an application part and a non-application part, wherein the application part is in contact with a patient, and thus needs to be provided with a floating ground, and the non-application part is used inside the electrical equipment, and is generally provided with a protective ground.

[0025] When the human body is in contact with the application part of the medical electrical equipment, the conductive part of different potentials will be contacted, at which time the potential difference will cause the current to flow through the human body, forming an electric contact. According to the size and duration of the current, the current generated by the potential difference has different effects on the human body. When the current is small, it is harmless to the human body, and when the current is large and the duration is long, the current effect will cause harm to the human body, which can cause ventricular fibrillation, cardiac arrest, organ damage and other pathophysiological effects. At this time, the electric contact is called electric shock, which is very dangerous to personal safety.

[0026] By designing an isolation measure in the medical electrical equipment, the patient connection part is separated from the ground part of the equipment and other accessible parts, so that the size of the current flowing through the patient's body and between the patient connection and the ground when the external power source is accidentally connected to the patient can be controlled. Such a design can protect the patient from electric shock.

[0027] The electrostatic treatment device according to the embodiments of the present application is described in detail below with reference to the accompanying drawings.

[0028] Figure 1 is a structural block diagram of the electrostatic treatment device 100 applied between an application part and a non-application part of a medical electrical equipment according to the embodiments of the present application. Referring to Figure 1 , the electrostatic treatment device 100 according to the embodiments of the present application comprises: a digital isolation circuit 110 arranged between a first processor of an application part of a medical electrical equipment and a second processor of a non-application part of the medical electrical equipment to perform signal transmission and electrically isolate the first processor from the second processor; a power isolation circuit 120 arranged between a first power supply of the application part and a second power supply of the non-application part to electrically isolate the first power supply from the second power supply; and a safety capacitor 130, one end of which is connected to a floating ground end of the application part and the other end of which is connected to a ground end of the non-application part to release electrostatic charges generated by the application part and block power frequency signals.

[0029] Specifically, the electrostatic treatment device 100 can be arranged in an electrically isolated region between the application part and the non-application part, and the electrically isolated region is electrically isolated from the outside, i.e. the electrically isolated region has no copper-coated ground of any network.

[0030] The digital isolation circuit 110 can be connected to the communication interfaces of the first processor (e.g. a single-chip microcomputer) of the application part and the second processor (e.g. a CPU) of the non-application part respectively, so that signal transmission can be performed between the first processor and the second processor through the communication interfaces, and the digital isolation circuit can also electrically isolate the first processor from the second processor. In addition, the digital isolation circuit 110 can also effectively suppress electromagnetic interference (EMI) and radio frequency interference (RFI), thereby enhancing the safety and reliability of the electronic system.

[0031] The power isolation circuit 120 is connected to the first power supply of the application part and the second power supply of the non-application part, thereby establishing electrical isolation between the first power supply and the second power supply. The power isolation circuit generally has strong electrostatic bearing capacity, which can improve the safety of the equipment, reduce the danger caused by power supply contact, and also protect each circuit in the equipment from power surge and other problems.

[0032] The safety capacitor 130 refers to a safety capacitor which will not cause electric shock and endanger personal safety after the capacitor fails, has high withstand voltage, and can also meet the safety requirements of medical electrical equipment across the isolation ends. In the embodiment, one end of the safety capacitor 130 is connected to the floating ground end of the application part, and the other end is connected to the ground end of the non-application part, thereby releasing the static electricity generated by the high-frequency high-voltage alternating current voltage in the application part and reducing the influence of the static electricity discharge moment on the application part. The capacitor has small impedance to high-frequency signals and high impedance to low-frequency signals. The static electricity signal bandwidth is generally 17.5 MHz-350 MHz, and the capacitor can discharge the high-frequency static electricity interference signal and block the 50 Hz power frequency signal to prevent electric shock.

[0033] In order to reduce the static electricity charge generated by the floating ground, a high-voltage resistor 140 can be connected in parallel at the safety capacitor, for releasing the accumulated charge of the static electricity discharge and preventing the charge from accumulating too high. Specifically, the capacitor cannot completely discharge all static electricity charges, and the charge accumulation will accumulate in the floating ground, causing a high DC voltage difference across the isolation ends. At this time, the addition of a resistor can slowly release the DC voltage, thereby protecting the isolation circuit. In the embodiment, a high-voltage resistor is selected, which has high withstand voltage and can also meet the safety requirements of medical electrical equipment across the isolation ends. In addition, medical electrical equipment generally has a leakage current requirement. For example, an electrocardiograph requires that the patient leakage current be less than 10 uA. The calculation needs to be performed according to the formula: leakage current = (voltage difference) / (resistance). I = U / X, X = Xc + R, Xc = 1 / 2πfc For an electrocardiograph, the actual leakage needs to meet I ≥ U / (1 / 2πfc + R) , I = 10 uA , f = 50 Hz , U = 242 V The high-voltage resistor of the embodiment is selected as 100 M + 22 pF , and the calculation I = 0.989 uA meets the actual requirements.

[0034] The digital isolation circuit 110 generally adopts an optical coupling isolator 121 or a magnetic coupling isolator or a capacitive coupling isolator 122 for configuration. Figure 2 is a first schematic diagram of the digital isolation circuit 110 of the static electricity processing device 100 according to the embodiment of the utility model. Referring to Figure 2If the digital isolation circuit 110 adopts the optocoupler 121, in order to effectively release the static electricity charge generated by the floating ground, a first protection part 123 can be additionally arranged between the signal transmission end of the optocoupler 121 and the signal transmission end of the first processor, and the protection part adopts a common mode inductance mode to consume the static electricity charge generated by the floating ground. The specific consumption process is that the static electricity signal is in the form of common mode interference on the communication transmission line. The common mode inductance can generate a large inductive reactance when the common mode current flows, at this time, the magnetic flux in the magnetic ring is superimposed, so as to achieve the suppression effect, and when the differential mode current flows through the two coils, the magnetic flux in the magnetic ring is cancelled, and there is almost no inductance, so the differential mode current is not affected. The common mode inductance can effectively suppress the common mode interference signal in the line, and has no effect on the differential mode signal normally transmitted in the line, so as to protect the signal transmission part from interference.

[0035] Figure 3 It is a first schematic diagram of the digital isolation circuit 110 of the static treatment device 100 according to the embodiment of the utility model. Referring to Figure 3 If the digital isolation circuit 110 adopts the magnetic coupling isolator or the capacitive coupling isolator 122, in order to effectively release the static electricity charge generated by the floating ground, a second protection part 124 can be additionally arranged between the signal transmission end of the magnetic coupling isolator or the capacitive coupling isolator 122 and the signal transmission end of the first processor, and the protection part adopts a common mode inductance and magnetic bead combination mode to consume the static electricity charge generated by the floating ground. The common mode rejection of the magnetic coupling isolator or the capacitive coupling isolator interface is generally good, but the static electricity protection capability is insufficient, and the magnetic bead which releases energy in the form of heat conversion can better protect the communication interface of the magnetic coupling isolator or the capacitive coupling isolator. For some sensitive point paths, the common mode inductance can also be cascaded, and better effect can be obtained. The full name of the magnetic bead is ferrite magnetic bead filter, which is an anti-interference element, and mainly releases energy in the form of heat conversion to protect the communication interface of the magnetic coupling isolator or the capacitive coupling isolator. The magnetic bead has high resistivity and magnetic permeability, and is equivalent to resistance and inductance in series, but the resistance value and inductance value change with frequency. With the increase of frequency, the magnetic permeability of the magnetic core decreases, resulting in the decrease of inductance of the inductance and the decrease of the inductive reactance component. However, at this time, the loss of the magnetic core increases, the resistance component increases, resulting in the increase of the total impedance, and when the high-frequency signal passes through the ferrite, the electromagnetic interference is absorbed and converted into heat energy in the form of dissipation.

[0036] Preferably, the static electricity processing device 100 further comprises a static electricity guiding component 150 electrically connected with the safety capacitor 130, for guiding the static electricity charge of the application part to the safety capacitor 130. Take the electrocardiograph as an example for specific description: when the electrocardiograph is tested for static electricity, the device is usually affected by the contact discharge of the banana plug interface of the lead wire and the air discharge of the lead wire connector part. The static electricity guiding path design generally leaves a piece of forbidden component area on the acquisition floating ground part PCB, which is isolated from other circuits of the acquisition floating ground part by using a relatively narrow non-coppered area. Then, full copper is carried out, and the network is floating ground. The path starts from the discharge ground of the interface ESD protection device, the shell ground of the external interface, directly connects to the safety capacitor in the safe isolation area, and is connected with other circuits of the acquisition floating ground circuit. The interference signal of the contact discharge is generally directly applied to the lead signal, and the ESD protection device (such as a pressure-sensitive resistor, a TVS, etc.) carried on the board can discharge the static electricity signal to the floating ground, and then through the static electricity guiding path, most of the interference can be discharged to the protection ground through the safety capacitor, avoiding affecting the acquisition of the actual electrocardiogram signal or interfering with the direct communication between the electrocardiogram signal processing single-chip microcomputer and the CPU. The other air discharge generally acts on the shell ground of the interface, which can be directly discharged through the static electricity guiding path, and the principle is the same as above.

[0037] The technical scheme provides a static electricity processing device, which releases accumulated static electricity charge by crossing the safety capacitor and the high-voltage resistor between the non-application part and the application part, and at the same time, in order to protect the digital isolation circuit, a protection part is established between the signal transmission end of the digital isolation circuit and the signal transmission end of the single-chip microcomputer, so as to consume the static electricity charge generated due to the floating ground, so that the signals of the non-application part and the application part are effectively transmitted, and the application reliability of the electrical equipment is improved.

[0038] In addition, in the present application, the description of the terms "embodiment", "the present embodiment", "another embodiment" and the like means that the specific features, structures, materials or characteristics described in combination with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, the person skilled in the art can combine and combine the different embodiments or examples described in the present specification and the features of the different embodiments or examples without contradiction.

[0039] It should be finally pointed out that: the above examples are only used to illustrate the technical solutions of the utility model, and not to limit them; although the utility model has been explained in detail with reference to the foregoing examples, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing examples, or make equivalent replacement to part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the utility model.

Claims

1. An electrostatic discharge treatment device for use in medical electrical equipment, said medical electrical equipment comprising a floating application portion and a grounded non-application portion, characterized in that, include: A digital isolation circuit is provided between a first processor in the application section and a second processor in the non-application section to perform signal transmission and electrically isolate the first processor from the second processor. A power isolation circuit is provided between the first power supply of the application section and the second power supply of the non-application section to electrically isolate the first power supply from the second power supply. as well as A safety capacitor, one end of which is connected to the floating ground of the application section and the other end of which is connected to the ground of the non-application section, to release the electrostatic charge generated by the application section and block power frequency signals.

2. The electrostatic treatment apparatus according to claim 1, characterized in that, Also includes: A high-voltage resistor, connected in parallel with the safety capacitor, is used to release the DC voltage generated by the accumulation of electrostatic charge.

3. The electrostatic treatment apparatus according to claim 2, characterized in that, The digital isolation circuit includes an optocoupler isolator and a first protection section, wherein the first protection section is disposed between the optocoupler isolator and the second processor.

4. The electrostatic treatment apparatus according to claim 2, characterized in that, The digital isolation circuit includes a magnetic coupling isolator or a capacitive coupling isolator and a second protection section, the second protection section being disposed between the digital isolation circuit and the second processor.

5. The electrostatic treatment apparatus according to claim 3, characterized in that, The first protection section is configured as a common-mode inductor to dissipate the electrostatic charge generated by the application section.

6. The electrostatic treatment apparatus according to claim 4, characterized in that, The second protection section is configured in combination with a common-mode inductor and a ferrite bead filter to dissipate the electrostatic charge generated by the application section.

7. The electrostatic treatment apparatus according to claim 1, characterized in that, The electrostatic treatment device is located in an electrically isolated area, which is electrically isolated from the outside.

8. The electrostatic treatment apparatus according to claim 1, characterized in that, The application part comes into contact with the patient.

9. The electrostatic treatment apparatus according to any one of claims 1 to 8, characterized in that, It also includes an electrostatic discharge guiding component, which is electrically connected to the safety capacitor and is used to guide the electrostatic charge of the application portion to the safety capacitor.

10. The electrostatic treatment apparatus according to claim 4, characterized in that, Ferrite bead filters release energy through thermal conversion to protect the communication interface of the magnetic or capacitive isolator.

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