Differential mode input impedance testing device for medical electrical equipment

Abstract

The utility model discloses a medical electrical equipment differential mode input impedance testing device which is respectively connected with a signal generator and electrical equipment to be tested. The circuit board is mounted in the shell; the toggle switch is arranged on the shell and is electrically connected with the circuit board; one side surface of the shell is provided with a first connecting hole for connecting a first connecting wire, and the other side surface of the shell is provided with a plurality of second connecting holes for connecting a plurality of second connecting wires; the connection between the testing device and the signal generator is realized through the first wiring, and the connection between the testing device and the electrical equipment to be tested is realized through the second wiring. When in use, the test device is respectively connected with a signal generator and electrical equipment to be tested to form a set of complete test circuit, the toggle switch is toggled to switch, two measured values are respectively substituted into a formula to calculate whether a result meets a standard requirement or not, and the whole process does not need to be powered off. The detection of one electrical device to be detected can be completed only by operating the toggle switch, and the efficiency is high.

Description

Technical Field

[0001] This utility model relates to the field of electrical equipment technology, and in particular to a differential input impedance testing device for medical electrical equipment. Background Technology

[0002] Electromyography (EMG) biofeedback is a device that uses surface motors to collect electromyographic signals from the human body as physiological information and provides feedback to the patient in the form of vision or hearing, enabling the patient to learn to consciously control their own psychological and physiological activities to treat diseases.

[0003] The electromyography (EMG) biofeedback device includes a differential input impedance. The differential input impedance is directly proportional to the accuracy of the operational amplifier. The larger the differential input impedance, the higher the accuracy of the operational amplifier, and thus the higher the accuracy of the EMG biofeedback device in acquiring the electromyographic signals of the human body.

[0004] The differential input impedance testing device is manufactured according to the YY / T 1095-2015 electromyography biofeedback instrument standard. It is mainly used to verify whether the differential input impedance of medical electrical equipment meets the requirements. The existing differential input impedance testing device has a relatively complex assembly process and high testing difficulty, resulting in long testing time and room for improvement. Utility Model Content

[0005] The purpose of this invention is to provide a differential input impedance testing device for medical electrical equipment, which can at least solve one of the above-mentioned problems.

[0006] According to one aspect of the present invention, a differential input impedance testing device for medical electrical equipment is provided, which is connected to a signal generator and the electrical equipment under test respectively. The testing device includes at least:

[0007] case;

[0008] Circuit board, installed inside the housing;

[0009] A toggle switch, mounted in the housing and electrically connected to the circuit board;

[0010] One side of the housing has a first connection hole for connecting the first wire, and the other side has multiple second connection holes for connecting multiple second wires.

[0011] The test device is connected to the signal generator via a first wiring connection, and the test device is connected to the electrical equipment under test via multiple second wiring connections.

[0012] Therefore, this utility model provides a test device that can quickly test the differential input impedance of medical electrical equipment. In use, the test device is connected to a signal generator and the electrical equipment under test to form a complete test circuit. The circuit is switched by turning a toggle switch. The two measured values ​​are then substituted into the formula to calculate whether the result meets the standard requirements. The whole process does not require power interruption. The test of an electrical equipment under test can be completed by simply operating the toggle switch, which is highly efficient.

[0013] In some implementations, the first connection is a one-to-two wire, with the input terminals of the first connection connected to the positive and negative terminals of the signal generator, respectively.

[0014] In some implementations, the second wiring consists of three wires, two of which serve as output terminals for the output electrodes of the electrical equipment under test, and the other as a reference terminal for the reference terminal of the electrical equipment under test.

[0015] In some implementations, the circuit board integrates an input interface corresponding to the first connection hole and three output interfaces: a first output interface, a second output interface, and a third output interface corresponding to the second connection hole.

[0016] In some embodiments, the circuit board also includes an inductor, a first resistor, a first capacitor, a second capacitor, and a third resistor disposed between the input interface and the first output interface. The first capacitor, the second capacitor, and the third resistor are all connected in parallel with the toggle switch and their two ends are connected in series with the first resistor and the first output interface, respectively. The two ends of the inductor are connected in series with the input interface and the first resistor, respectively.

[0017] In some embodiments, the circuit board also includes a second resistor, a fourth resistor, a third capacitor, and a fourth capacitor disposed between the input interface and the second output interface. The second resistor and the fourth resistor are connected in series, the second resistor is connected in series with the first resistor, the fourth resistor is connected in series with the second output interface, the third capacitor is connected in series with both the inductor and the second output interface, and the fourth capacitor is connected in parallel with the first resistor and in series with both the inductor and the second output interface.

[0018] In some embodiments, a third connection hole is provided at the top of the housing to cooperate with the toggle switch.

[0019] In some implementations, during testing, the testing device is connected to the electrical device under test (DUT) via a second wiring connection and to a signal generator via a first wiring connection. The signal generator outputs a sinusoidal AC signal with an amplitude of 100.0 mVrms and a frequency equal to the center frequency designed by the signal generator manufacturer. The toggle switch is turned off, and the displayed value of the DUT is read. The toggle switch is turned on, and the displayed value of the DUT is read again. Then, Z is calculated according to the following formula (1). di :

[0020]

[0021] In the formula: Z di V1 is the differential input impedance, in megohms; V2 is the displayed value of the electrical device under test when the toggle switch is closed; R = 0.62MΩ.

[0022] The beneficial effects of this utility model are:

[0023] This invention provides a testing device that can quickly test the differential input impedance of medical electrical equipment. In use, the testing device is connected to a signal generator and the electrical equipment under test to form a complete testing circuit. The circuit is switched by toggling a toggle switch. The measured values ​​are then substituted into a formula to calculate whether the result meets the standard requirements. The entire process does not require power interruption. The testing of one electrical equipment can be completed simply by operating the toggle switch, which is highly efficient.

[0024] The differential input impedance testing device for medical electrical equipment of this invention simplifies and makes portable complex tests, reducing testing difficulty and saving testing time. The fixed testing device makes testing more convenient and faster. Attached Figure Description

[0025] Figure 1 This is a three-dimensional structural diagram of the testing device of this utility model;

[0026] Figure 2 for Figure 1 One of the three-dimensional structural schematic diagrams of the housing of the medical electrical equipment differential input impedance testing device shown;

[0027] Figure 3 for Figure 1 The second schematic diagram of the three-dimensional structure of the housing of the medical electrical equipment differential input impedance testing device shown;

[0028] Figure 4 This is a circuit diagram of the testing device of this utility model;

[0029] Figure 5 This is a schematic diagram illustrating the application of the testing device of this utility model.

[0030] Figures 1-5The reference numerals in the attached drawings are as follows: 100-Test device; 200-Signal generator; 300-Electrical device under test; 1-Housing; 2-Circuit board; 3-First wiring; 4-Second wiring; 11-First connection hole; 12-Second connection hole; 13-Third connection hole; SW1-Toggle switch; Pin2-Input interface; Pin1-First output interface; Pin3-Second output interface; Pin4-Third output interface; L1-Inductor; R1-First resistor; R2-Second resistor; R3-Third resistor; R4-Fourth resistor; C1-First capacitor; C2-Second capacitor; C3-Third capacitor; C4-Fourth capacitor. Detailed Implementation

[0031] The present invention will now be described in further detail with reference to the accompanying drawings.

[0032] Figures 1-5 The diagram schematically illustrates a differential input impedance testing device for medical electrical equipment according to one embodiment of the present invention.

[0033] like Figures 1-5 As shown, the differential input impedance testing device 100 for medical electrical equipment is connected to the signal generator 200 and the electrical device under test 300, respectively. The testing device 100 includes at least:

[0034] Casing 1;

[0035] Circuit board 2 is installed inside housing 1;

[0036] The toggle switch SW1 is mounted on housing 1 and electrically connected to circuit board 2;

[0037] One side of the housing 1 is provided with a first connection hole 11 for connecting the first wire 3, and the other side is provided with a plurality of second connection holes 12 for connecting a plurality of second wires 4.

[0038] The test device 100 is connected to the signal generator 200 via the first wiring 3, and the test device 100 is connected to the electrical equipment under test 300 via multiple second wirings 4.

[0039] The first connector 3 is a one-to-two wire, and the input terminals of the first connector 3 are respectively connected to the positive and negative terminals of the signal generator 200.

[0040] The second wiring 4 consists of three wires, two of which serve as output terminals for the electrical equipment under test 300, and the other serves as a reference terminal for the electrical equipment under test 300.

[0041] like Figure 4As shown, the circuit board 2 integrates an input interface Pin2 corresponding to the first connection hole 11 and multiple output interfaces corresponding to the second connection hole 12, namely the first output interface Pin1, the second output interface Pin3, and the third output interface Pin4. The third output interface Pin4 corresponds to the reference pole and is grounded. The third output interface Pin4 is connected in series with the first output interface Pin1 and the second output interface Pin3, and is connected in parallel with the input port Pin2 and grounded together.

[0042] The circuit board 2 also includes an inductor L1, a first resistor R1, a first capacitor C1, a second capacitor C2, and a third resistor R3 disposed between the input interface Pin2 and the first output interface Pin1. The first capacitor C1, the second capacitor C2, and the third resistor R3 are all connected in parallel with the toggle switch SW1 and their two ends are connected in series with the first resistor R1 and the first output interface Pin1, respectively. The two ends of the inductor L1 are connected in series with the input interface Pin2 and the first resistor R1, respectively.

[0043] The circuit board 2 also includes a second resistor R2, a fourth resistor R4, a third capacitor C3, and a fourth capacitor C4 disposed between the input interface Pin2 and the second output interface Pin3. The second resistor R2 and the fourth resistor R4 are connected in series. The second resistor R2 is connected in series with the first resistor R1. The fourth resistor R4 is connected in series with the second output interface Pin3. The third capacitor C3 is connected in series with the inductor L1 and the second output interface Pin3. The fourth capacitor C4 is connected in parallel with the first resistor R1 and is connected in series with the inductor L1 and the second output interface Pin3.

[0044] Preferably, the inductor L1 is 10uH, the first resistor R1 is 100K ohms, the first capacitor C1 is a normally closed contact capacitor, the second capacitor C2 is 4.7NF, the third resistor R3 is 620K ohms, the second resistor R2 is 100 ohms, the fourth resistor R4 is 10 ohms, the third capacitor C3 is 10NF, and the fourth capacitor C4 is 100pF.

[0045] The top of the housing 1 has a third connection hole 13 that mates with the toggle switch SW1. The toggle switch SW1 can be easily installed through the third connection hole 13.

[0046] During testing, the test device 100 is connected to the electrical device under test 300 via the second wiring 4 and to the signal generator 200 via the first wiring 3. The amplitude of the sinusoidal AC signal output by the signal generator 200 is adjusted to 100.0mVrms, and the frequency is the center frequency designed by the manufacturer of the signal generator 200. The toggle switch SW1 is turned off, and the display value of the electrical device under test 300 is read. The toggle switch SW1 is turned on, and the display value of the electrical device under test 300 is read. Then, Z is calculated according to the following formula (1). di :

[0047]

[0048] In the formula: Z di V1 is the differential input impedance in megohms; V2 is the reading of the device under test (DUT) 300 when toggle switch SW1 is closed; R = 0.62 MΩ.

[0049] This invention provides a testing device 100 capable of quickly testing the differential input impedance of medical electrical equipment. In use, the testing device 100 is connected to a signal generator 200 and the electrical equipment under test 300 to form a complete testing circuit. By switching the circuit using a toggle switch SW1, the measured values ​​are substituted into a formula to calculate whether the result meets the standard requirements. The entire process does not require power interruption; the testing of one electrical equipment under test 300 can be completed simply by operating the toggle switch SW1, resulting in high efficiency.

[0050] The differential input impedance testing device 100 for medical electrical equipment of this invention simplifies and makes the test more portable, reducing the difficulty of the test and saving the test time. The fixed testing device 100 makes the test more convenient and faster.

[0051] The above descriptions are merely some embodiments of this utility model. For those skilled in the art, various modifications and improvements can be made without departing from the inventive concept of this utility model, and all such modifications and improvements fall within the protection scope of this utility model.

Claims

1. A differential input impedance testing device for medical electrical equipment, connected to a signal generator (200) and the electrical equipment under test (300), characterized in that, The test apparatus (100) includes at least: Shell (1); Circuit board (2) is installed inside the housing (1); A toggle switch (SW1) is mounted on the housing (1) and electrically connected to the circuit board (2); The housing (1) has a first connection hole (11) for connecting the first wire (3) on one side and a plurality of second connection holes (12) for connecting a plurality of second wires (4) on the other side. The test device (100) is connected to the signal generator (200) through the first wiring (3), and the test device (100) is connected to the electrical device under test (300) through multiple second wirings (4).

2. The differential input impedance testing device for medical electrical equipment according to claim 1, characterized in that, The first wiring (3) is a one-to-two wire, and the input terminals of the first wiring (3) are respectively connected to the positive and negative terminals of the signal generator (200).

3. The differential input impedance testing device for medical electrical equipment according to claim 1, characterized in that, The second wiring (4) consists of three wires, two of which serve as the output terminals of the electrical equipment under test (300), and the other serves as the reference terminal of the electrical equipment under test (300).

4. The differential input impedance testing device for medical electrical equipment according to claim 3, characterized in that, The circuit board (2) integrates an input interface (Pin2) corresponding to the first connection hole (11) and three output interfaces: a first output interface (Pin1), a second output interface (Pin3), and a third output interface (Pin4) corresponding to the second connection hole (12).

5. The differential input impedance testing device for medical electrical equipment according to claim 4, characterized in that, The circuit board (2) also includes an inductor (L1), a first resistor (R1), a first capacitor (C1), a second capacitor (C2), and a third resistor (R3) disposed between the input interface (Pin2) and the first output interface (Pin1). The first capacitor (C1), the second capacitor (C2), and the third resistor (R3) are all connected in parallel with the toggle switch (SW1) and their two ends are connected in series with the first resistor (R1) and the first output interface (Pin1), respectively. The two ends of the inductor (L1) are connected in series with the input interface (Pin2) and the first resistor (R1), respectively.

6. The differential input impedance testing device for medical electrical equipment according to claim 5, characterized in that, The circuit board (2) also includes a second resistor (R2), a fourth resistor (R4), a third capacitor (C3), and a fourth capacitor (C4) disposed between the input interface (Pin2) and the second output interface (Pin3). The second resistor (R2) and the fourth resistor (R4) are connected in series. The second resistor (R2) is connected in series with the first resistor (R1). The fourth resistor (R4) is connected in series with the second output interface (Pin3). The third capacitor (C3) is connected in series with the inductor (L1) and the second output interface (Pin3). The fourth capacitor (C4) is connected in parallel with the first resistor (R1) and in series with the inductor (L1) and the second output interface (Pin3).

7. The differential input impedance testing device for medical electrical equipment according to any one of claims 1-6, characterized in that, The top of the housing (1) is provided with a third connection hole (13) that cooperates with the toggle switch (SW1).

8. The differential input impedance testing device (100) for medical electrical equipment according to any one of claims 1-6, characterized in that, During testing, the test device (100) is connected to the electrical device under test (300) via the second wiring (4) and to the signal generator (200) via the first wiring (3). The amplitude of the sinusoidal AC signal output by the signal generator (200) is adjusted to 100.0 mVrms, and the frequency is the center frequency designed by the signal generator (200) manufacturer. The toggle switch (SW1) is turned off, and the display value of the electrical device under test (300) is read. The toggle switch (SW1) is turned on, and the display value of the electrical device under test (300) is read. Then, Z is calculated according to the following formula (1). di : In the formula: Z di V1 is the differential input impedance, in megohms; V2 is the displayed value of the electrical device under test when the toggle switch is closed; R = 0.62MΩ.

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