Surgical equipment non-contact voltage measurement system based on capacitive coupling

Abstract

The invention discloses a surgical equipment non-contact voltage measuring system based on capacitive coupling, which belongs to the technical field of medical electronic equipment monitoring, and completes original signal acquisition in a mode of electrically connecting a PCB capacitive coupling module with a high-voltage output end of radio-frequency surgical equipment or high-frequency surgical equipment. The test capacitor integrated in the PCB capacitance coupling module is used for measuring the voltage of the to-be-measured surgical equipment to obtain a differential signal, the measurement capacitor is directly integrated in the PCB capacitance coupling module, an external sensor is not needed, the interference of the external environment on the measurement result is avoided, the accuracy of the measurement result is improved, and in addition, the measurement accuracy is improved. In addition, common-mode rejection processing of the differential amplification module is combined, more accurate differential amplification voltage signals can be obtained, measurement result data are generated after the signals are processed by the analog-digital processing module and the data processing module, data interaction is completed, the purpose of voltage measurement is achieved, and non-contact voltage measurement is achieved.

Description

Technical Field

[0001] This invention belongs to the field of medical electronic equipment monitoring technology, specifically relating to a non-contact voltage measurement system for surgical equipment based on capacitive coupling. Background Technology

[0002] In the field of output voltage measurement for high-frequency and radiofrequency surgical equipment, traditional probe measurement technology is still the main method. This measurement scheme requires direct physical contact to obtain the voltage signal from the high-voltage output terminal. The nature of this design inevitably leads to two major drawbacks: First, the high-voltage output terminal of the surgical equipment (usually reaching several kilovolts) is directly connected to human tissue. Probe contact may damage the electrical isolation barrier, leading to a sharp increase in the risk of leakage, especially in humid surgical environments or when the equipment insulation is aging, which may even cause electric shock accidents to medical staff and patients. Second, as an external load, the matching problem between the input impedance (usually in the megaohm range) of the probe and the output impedance of the equipment will directly interfere with the original signal, resulting in output power fluctuations, distortion of cutting / coagulation effects, and seriously affecting the stability of surgical operations.

[0003] In addition, another commonly used measurement method is the current transformer measurement scheme. Although it is mature in the power frequency field, it is often limited in high-frequency scenarios by the high-frequency loss characteristics of magnetic materials (for example, ferrite enters the region of sharp loss increase above 1MHz). Its frequency response upper limit is generally below 1MHz, making it difficult to cover the operating frequency band of radiofrequency ablation devices (0.3-5MHz). More importantly, the nonlinear magnetization curve of the current transformer causes a significant nonlinear relationship between the output signal and the input voltage. Especially under high-voltage pulse conditions, the core saturation effect will further aggravate the measurement distortion, making it impossible to accurately reproduce the output voltage of the surgical equipment. Furthermore, its large size and weight contradict the trend of portable surgical equipment, limiting the practical application scenarios of this measurement scheme.

[0004] In recent years, external capacitive coupling voltage measurement technology has emerged. This technology achieves non-contact measurement through spatial electric field induction, avoiding the risks of contact. However, due to complex parasitic parameters (including lead inductance and distributed capacitance) between the surgical equipment output and the coupling capacitor, the impedance of these parasitic components can resonate with the main circuit at radio frequency, causing periodic distortion of the measurement signal. Objects in the environment with significantly different dielectric constants, such as metal instruments and human tissue, can also alter the spatial electric field distribution, leading to reduced coupling efficiency. This makes the measurement results highly sensitive to the surgical environment, with high repeatability errors, making it difficult to meet the accuracy requirements of voltage measurement in clinical settings.

[0005] As mentioned above, how to provide a non-contact voltage measurement system for surgical devices based on capacitive coupling that can improve ease of use and achieve more accurate voltage measurement has become an urgent problem to be solved in this field. Summary of the Invention

[0006] The purpose of this invention is to provide a non-contact voltage measurement system for surgical devices based on capacitive coupling, in order to solve the above-mentioned problems existing in the prior art.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] In a first aspect, the present invention provides a non-contact voltage measurement system for surgical equipment based on capacitive coupling, comprising: a PCB capacitive coupling module, a differential amplification module, an analog-to-digital processing module, and a data processing module;

[0009] The voltage acquisition terminal of the PCB capacitive coupling module is electrically connected to the high-voltage output terminal of the surgical device under test. The coupling output terminal of the PCB capacitive coupling module is coupled to the differential signal input terminal of the differential amplification module. The differential amplified voltage signal output terminal of the differential amplification module is electrically connected to the differential amplified voltage signal input terminal of the analog-to-digital processing module. The digital signal output terminal of the analog-to-digital processing module is electrically connected to the digital signal input terminal of the data processing module. The measurement result data output terminal of the data processing module is communicatively connected to an external interactive module.

[0010] The PCB capacitive coupling module integrates a measuring capacitor, which is used to perform non-contact measurement on the raw voltage signal received from the high voltage output terminal of the surgical device under test to generate a differential signal, and output the differential signal to the differential signal input terminal of the differential amplification module.

[0011] In one possible design, the surgical device under test is a radio frequency surgical device or a high frequency surgical device, and the high voltage output terminal of the surgical device under test is the live wire output terminal and the neutral wire output terminal of the radio frequency surgical device or the live wire output terminal and the neutral wire output terminal of the high frequency surgical device.

[0012] In one possible design, the PCB capacitor coupling module includes a first PCB capacitor coupling unit and a second PCB capacitor coupling unit;

[0013] Wherein, the voltage acquisition terminal of the first PCB capacitor coupling unit is electrically connected to the live wire output terminal of the radio frequency surgical device or the live wire output terminal of the high frequency surgical device, and the coupling output terminal of the first PCB capacitor coupling unit is coupled to the differential signal input terminal of the differential amplifier module;

[0014] The voltage acquisition terminal of the second PCB capacitor coupling unit is electrically connected to the neutral output terminal of the radio frequency surgical device or the neutral output terminal of the high frequency surgical device, and the coupling output terminal of the second PCB capacitor coupling unit is coupled to the differential signal input terminal of the differential amplifier module.

[0015] In one possible design, both the first PCB capacitive coupling unit and the second PCB capacitive coupling unit include an integrated measurement capacitor;

[0016] The measuring capacitor is a parallel plate capacitor. The input terminal of the measuring capacitor serves as the voltage acquisition terminal of the PCB capacitor coupling module and is electrically connected to the high voltage output terminal of the surgical device under test. The output terminal of the measuring capacitor serves as the coupling output terminal of the PCB capacitor coupling module and is coupled to the differential signal input terminal of the differential amplifier module.

[0017] In one possible design, the measuring capacitor consists of a high-voltage electrode layer, an insulating dielectric layer, and a coupling layer;

[0018] The high-voltage electrode layer is disposed on one side of the insulating dielectric layer, the coupling layer is disposed on the other side of the insulating dielectric layer, and the high-voltage electrode layer and the coupling layer are arranged in parallel to form a parallel plate capacitor.

[0019] The input terminal of the measuring capacitor is disposed on the high voltage electrode layer, and the output terminal of the measuring capacitor is disposed on the coupling layer.

[0020] In one possible design, the insulating dielectric layer is made of FR-4 standard insulating material or high-frequency laminate material Rogers4350B, and two parallel and symmetrically arranged copper foils are provided on the side of the coupling layer close to the insulating dielectric layer, and a windowed ground layer is provided on the side of the coupling layer away from the insulating dielectric layer.

[0021] The windowed layer includes two window opening positions, and the two window opening positions are set to correspond to the positions of the two parallel and symmetrically arranged copper foils.

[0022] In one possible design, the differential amplifier module includes an operational amplifier input unit and a differential output unit;

[0023] The input terminal of the operational amplifier input unit serves as the differential signal input terminal of the differential amplifier module and is coupled to the coupling output terminal of the PCB capacitor coupling module. The output terminal of the operational amplifier input unit is electrically connected to the input terminal of the differential output unit. The output terminal of the differential output unit serves as the differential amplified voltage signal output terminal of the differential amplifier module and is electrically connected to the differential amplified voltage signal input terminal of the analog-to-digital processing module.

[0024] In one possible design, the op-amp input unit includes a first operational amplifier, a second operational amplifier, a first capacitor, a second capacitor, a first resistor, a second resistor, a third resistor, a fourth resistor, and a fifth resistor;

[0025] Wherein, the non-inverting input terminal of the first operational amplifier serves as the differential signal input terminal of the differential amplifier module and is coupled to the coupling output terminal of the PCB capacitor coupling module. The non-inverting input terminal of the first operational amplifier is also grounded through the first capacitor. The non-inverting input terminal of the second operational amplifier also serves as the differential signal input terminal of the differential amplifier module and is coupled to the coupling output terminal of the PCB capacitor coupling module. The non-inverting input terminal of the second operational amplifier is also grounded through the second capacitor. The inverting input terminal of the first operational amplifier is electrically connected to the inverting input terminal of the second operational amplifier through the first resistor.

[0026] The output terminal of the first operational amplifier is electrically connected to the inverting input terminal of the first operational amplifier through the second resistor, the output terminal of the second operational amplifier is electrically connected to the inverting input terminal of the second operational amplifier through the third resistor, the output terminal of the first operational amplifier is also electrically connected to the first input terminal of the differential output unit through the fourth resistor, and the output terminal of the second operational amplifier is also electrically connected to the second input terminal of the differential output unit through the fifth resistor.

[0027] In one possible design, the differential output unit includes a first differential amplifier, a sixth resistor, and a seventh resistor;

[0028] The non-inverting input terminal of the first differential amplifier serves as the first input terminal of the differential output unit and is electrically connected to the fourth resistor. The non-inverting input terminal of the first differential amplifier is also grounded through the sixth resistor.

[0029] The inverting input terminal of the first differential amplifier serves as the second input terminal of the differential output unit and is electrically connected to the fifth resistor. The inverting input terminal of the first differential amplifier is also electrically connected to the output terminal of the first differential amplifier through the seventh resistor.

[0030] The output terminal of the first differential amplifier serves as the output terminal of the differential output unit and is electrically connected to the differential amplified voltage signal input terminal of the analog-to-digital processing module.

[0031] In one possible design, the analog-to-digital processing module is used to perform analog processing on the differential amplified voltage signal received from the differential amplification module, and convert the differential amplified voltage signal after analog processing into a digital signal to form a voltage measurement digital signal. The voltage measurement digital signal is then output to the digital signal input terminal of the data processing module through the digital signal output terminal of the analog-to-digital processing module.

[0032] The data processing module is used to calculate the effective voltage value, peak voltage value, voltage frequency and / or voltage harmonics of the voltage measurement digital signal received from the analog-to-digital processing module, and send the calculation results as measurement result data to the external interaction module through the measurement result data output terminal of the data processing module.

[0033] The external interaction module includes a result display unit and an early warning unit. The result display unit is used to receive the measurement result data and visualize the measurement result data. The early warning unit is used to compare the measurement result data with a preset standard measurement result range in the early warning unit, and generate an alarm message when the measurement result data exceeds the standard measurement result range, and send the alarm message to the result display unit for visualization.

[0034] Secondly, the present invention provides a non-contact voltage measurement method for surgical devices based on capacitive coupling, which is implemented by a non-contact voltage measurement system for surgical devices based on capacitive coupling as described in the first aspect or any possible design of the first aspect, and may specifically include, but is not limited to, the following steps:

[0035] The voltage acquisition terminal of the PCB capacitor coupling module is electrically connected to the high voltage output terminal of the surgical device under test, and the high voltage output signal of the surgical device under test is acquired as the original measurement signal.

[0036] The original measurement signal is coupled in a non-contact measurement manner through the measurement capacitor on the PCB capacitive coupling module to generate a differential signal;

[0037] The differential signal is input into the differential amplification module, and the differential amplification module is used to differentially amplify the differential signal to achieve common-mode noise suppression and obtain a differential amplified voltage signal.

[0038] The differential amplified voltage signal is processed by the analog-to-digital processing module to obtain a voltage measurement digital signal, and the voltage measurement digital signal is output to the data processing module.

[0039] The data processing module performs voltage data calculation on the voltage measurement digital signal and outputs the calculated result as measurement result data to the external interaction module for data interaction to complete the voltage measurement.

[0040] Beneficial Effects: This invention provides a non-contact voltage measurement system for surgical equipment based on capacitive coupling, comprising: a PCB capacitive coupling module, a differential amplification module, an analog-to-digital processing module, and a data processing module; wherein, the voltage acquisition terminal of the PCB capacitive coupling module is electrically connected to the high-voltage output terminal of the surgical equipment under test, the coupling output terminal of the PCB capacitive coupling module is coupled to the differential signal input terminal of the differential amplification module, the differential amplified voltage signal output terminal of the differential amplification module is electrically connected to the differential amplified voltage signal input terminal of the analog-to-digital processing module, the digital signal output terminal of the analog-to-digital processing module is electrically connected to the digital signal input terminal of the data processing module, and the measurement result data output terminal of the data processing module is communicatively connected to an external interaction module; the PCB capacitive coupling module integrates a measuring capacitor, which is used to perform non-contact measurement of the raw voltage signal received from the high-voltage output terminal of the surgical equipment under test to generate a differential signal, and outputs the differential signal to the differential signal input terminal of the differential amplification module. The raw signal is acquired by electrically connecting the PCB capacitive coupling module to the high-voltage output terminal of the radio frequency or high-frequency surgical equipment. The voltage of the surgical equipment under test is measured using the test capacitor integrated in the PCB capacitive coupling module to obtain a differential signal. Since the measuring capacitor is directly integrated inside the PCB capacitive coupling module, no external sensor is required, avoiding interference from the external environment and improving the accuracy of the measurement results. Furthermore, combined with the common-mode rejection processing of the differential amplification module, a more accurate differential amplified voltage signal can be obtained. After processing by the analog-to-digital processing module and the data processing module, the measurement result data is generated and data interaction is completed to achieve the purpose of voltage measurement, realizing non-contact voltage measurement. Attached Figure Description

[0041] Figure 1 A functional structure diagram of a non-contact voltage measurement system for surgical equipment based on capacitive coupling, provided in an embodiment of the present invention;

[0042] Figure 2 This is a schematic diagram of the structure of the measuring capacitor provided in an embodiment of the present invention;

[0043] Figure 3 A circuit connection diagram of the differential amplifier module provided in an embodiment of the present invention;

[0044] Figure 4This is a flowchart illustrating a non-contact voltage measurement method for surgical devices based on capacitive coupling, as provided in an embodiment of the present invention.

[0045] In the diagram, U1 is the first operational amplifier; U2 is the second operational amplifier; U3 is the first differential amplifier; C1 is the first capacitor; C2 is the second capacitor; R1 is the first resistor; R2 is the second resistor; R3 is the third resistor; R4 is the fourth resistor; R5 is the fifth resistor; R6 is the sixth resistor; and R7 is the seventh resistor. Detailed Implementation

[0046] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the present invention will be briefly introduced below in conjunction with the accompanying drawings and descriptions of the embodiments or the prior art. Obviously, the following description of the structure of the accompanying drawings is only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. It should be noted that the description of these embodiments is for the purpose of helping to understand the present invention, but does not constitute a limitation of the present invention.

[0047] It should be understood that although the terms first, second, etc., may be used herein to describe various units, these units should not be limited by these terms. These terms are only used to distinguish one unit from another. For example, a first unit may be referred to as a second unit, and similarly, a second unit may be referred to as a first unit, without departing from the scope of the exemplary embodiments of the invention.

[0048] It should be understood that the term "and / or" that may appear in this document is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can mean: A exists alone, B exists alone, and A and B exist simultaneously. The term " / and" that may appear in this document describes another relationship between related objects, indicating that two relationships can exist. For example, A / and B can mean: A exists alone, and A and B exist alone. In addition, the character " / " that may appear in this document generally indicates that the related objects before and after it are in an "or" relationship.

[0049] Example:

[0050] like Figure 1 As shown, the first aspect of this embodiment provides a non-contact voltage measurement system for surgical equipment based on capacitive coupling. The present invention provides a non-contact voltage measurement system for surgical equipment based on capacitive coupling, including: a PCB capacitive coupling module, a differential amplification module, an analog-to-digital processing module, and a data processing module;

[0051] The voltage acquisition terminal of the PCB capacitive coupling module is electrically connected to the high-voltage output terminal of the surgical device under test. The coupling output terminal of the PCB capacitive coupling module is coupled to the differential signal input terminal of the differential amplification module. The differential amplified voltage signal output terminal of the differential amplification module is electrically connected to the differential amplified voltage signal input terminal of the analog-to-digital processing module. The digital signal output terminal of the analog-to-digital processing module is electrically connected to the digital signal input terminal of the data processing module. The measurement result data output terminal of the data processing module is communicatively connected to an external interactive module.

[0052] The PCB capacitive coupling module integrates a measuring capacitor, which is used to perform non-contact measurement on the raw voltage signal received from the high voltage output terminal of the surgical device under test to generate a differential signal, and output the differential signal to the differential signal input terminal of the differential amplification module.

[0053] It should be noted that the design of the PCB capacitive coupling module, while meeting the safety standards for medical devices, enables the measurement system provided in this embodiment to achieve effective voltage measurement of radio frequency surgical equipment or high frequency surgical equipment, and has high measurement accuracy and anti-interference capability.

[0054] In one possible implementation, the surgical device under test is a radio frequency surgical device or a high frequency surgical device, and the high voltage output terminal of the surgical device under test is the live wire output terminal and the neutral wire output terminal of the radio frequency surgical device or the live wire output terminal and the neutral wire output terminal of the high frequency surgical device.

[0055] In one possible implementation, the PCB capacitor coupling module includes a first PCB capacitor coupling unit and a second PCB capacitor coupling unit;

[0056] Wherein, the voltage acquisition terminal of the first PCB capacitor coupling unit is electrically connected to the live wire output terminal of the radio frequency surgical device or the live wire output terminal of the high frequency surgical device, and the coupling output terminal of the first PCB capacitor coupling unit is coupled to the differential signal input terminal of the differential amplifier module;

[0057] The voltage acquisition terminal of the second PCB capacitor coupling unit is electrically connected to the neutral output terminal of the radio frequency surgical device or the neutral output terminal of the high frequency surgical device, and the coupling output terminal of the second PCB capacitor coupling unit is coupled to the differential signal input terminal of the differential amplifier module.

[0058] In one possible implementation, both the first PCB capacitive coupling unit and the second PCB capacitive coupling unit include an integrated measurement capacitor.

[0059] The measuring capacitor is a parallel plate capacitor. The input terminal of the measuring capacitor serves as the voltage acquisition terminal of the PCB capacitor coupling module and is electrically connected to the high voltage output terminal of the surgical device under test. The output terminal of the measuring capacitor serves as the coupling output terminal of the PCB capacitor coupling module and is coupled to the differential signal input terminal of the differential amplifier module.

[0060] In one possible implementation, the measuring capacitor comprises a high-voltage electrode layer, an insulating dielectric layer, and a coupling layer;

[0061] The high-voltage electrode layer is disposed on one side of the insulating dielectric layer, the coupling layer is disposed on the other side of the insulating dielectric layer, and the high-voltage electrode layer and the coupling layer are arranged in parallel to form a parallel plate capacitor.

[0062] The input terminal of the measuring capacitor is disposed on the high voltage electrode layer, and the output terminal of the measuring capacitor is disposed on the coupling layer.

[0063] like Figure 2 As shown, specifically, in the structure of the measuring capacitor, A1 and A2 are the input terminals of the measuring capacitor, which are set on the high voltage electrode layer. F1 and F2 are two parallel and symmetrically arranged copper foils, which are set on the coupling layer to form the sensing electrode layer. Since they are symmetrically arranged, the area and size of the two copper foils are the same. B1 and B2 are the output terminals of the measuring capacitor.

[0064] In practical design, the area A of the copper foil (which is also the effective area of ​​the measuring capacitor: the larger the effective area, the higher the capacitance value of the measuring capacitor; however, in specific design, the space occupation and parasitic inductance on the PCB board need to be considered) can be expressed as L1·L2. The width L1 of the copper foil can preferably be set to 1mm, and the length L2 of the copper foil can preferably be set to 5mm. As the measuring capacitor is a parallel plate capacitor, its interlayer spacing H (that is, the thickness d of the insulating dielectric layer; in practical design, the thickness d of the insulating dielectric layer can be used to control the capacitance value and the strength of electrical isolation of the measuring capacitor: the smaller the thickness, the larger the capacitance value, but its thickness needs to ensure the insulation safety of the equipment) can preferably be set to 0.2mm. Therefore, the size of the measuring capacitor can be calculated by the following formula:

[0065]

[0066] Where C is the capacitance value of the measured capacitor, and ε0 is the vacuum permittivity, specifically 8.854 × 10⁻⁶. -12 F / m (vacuum permittivity), ε r The dielectric constant of the insulating dielectric layer;

[0067] In a specific design, the dielectric constant ε of the insulating dielectric layer r We can choose 4.5, therefore, the capacitance value C of the measured capacitor is:

[0068]

[0069] However, the capacitance value C calculated here is actually an ideal capacitance value. This is because the formula for calculating the capacitance of a parallel plate assumes that the electric field lines are completely uniform, perpendicular to the plates, and have no edge divergence. Therefore, this formula is only completely accurate when the copper foil is infinitely large and the spacing is infinitely small. But in actual design, the copper foil is of finite size. Therefore, at the edge of the copper foil, the electric field lines will bend and diverge outward, resulting in the "fringe effect". At this time, it is necessary to introduce the Schwarz-Christoffel mapping to map the complex capacitance region with edge field into an upper half-plane, thereby simplifying the solution of electrostatic problems, calculating a more accurate capacitance value, and completing the design of the actual required measurement capacitor based on the calculated capacitance value.

[0070] In one possible implementation, the insulating dielectric layer is made of FR-4 standard insulating material or high-frequency laminate material Rogers 4350B, and two parallel and symmetrically arranged copper foils are disposed on the side of the coupling layer close to the insulating dielectric layer, and a windowed ground layer is disposed on the side of the coupling layer away from the insulating dielectric layer.

[0071] The windowed layer includes two window opening positions, and the two window opening positions are set to correspond to the positions of the two parallel and symmetrically arranged copper foils.

[0072] It should be noted that FR-4 (Flame-Retardant 4) is a fire-resistant material grade designation and does not limit the specific model or material of the material. Materials that meet this grade are considered to be insulating materials of the FR-4 standard. For example, insulating materials of the FR-4 standard may include, but are not limited to, composite materials made of tetrafunctional epoxy resin, fillers and glass fiber.

[0073] Rogers 4350B is a high-performance high-frequency laminate composed of hydrocarbon resin, glass cloth, and ceramic filler. It has characteristics such as low dielectric constant, low loss, strong thermal stability, and good processing compatibility. Therefore, it is also very suitable as the material for the insulating dielectric layer in this embodiment, which can effectively achieve electrical isolation to meet the safety standards of medical devices.

[0074] In one possible implementation, the differential amplifier module includes an operational amplifier input unit and a differential output unit;

[0075] The input terminal of the operational amplifier input unit serves as the differential signal input terminal of the differential amplifier module and is coupled to the coupling output terminal of the PCB capacitor coupling module. The output terminal of the operational amplifier input unit is electrically connected to the input terminal of the differential output unit. The output terminal of the differential output unit serves as the differential amplified voltage signal output terminal of the differential amplifier module and is electrically connected to the differential amplified voltage signal input terminal of the analog-to-digital processing module.

[0076] In one possible implementation, the operational amplifier input unit includes a first operational amplifier U1, a second operational amplifier U2, a first capacitor C1, a second capacitor C2, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, and a fifth resistor R5.

[0077] Wherein, the non-inverting input terminal of the first operational amplifier U1 serves as the differential signal input terminal of the differential amplifier module and is coupled to the coupling output terminal of the PCB capacitor coupling module. The non-inverting input terminal of the first operational amplifier U1 is also grounded through the first capacitor C1. The non-inverting input terminal of the second operational amplifier U2 also serves as the differential signal input terminal of the differential amplifier module and is coupled to the coupling output terminal of the PCB capacitor coupling module. The non-inverting input terminal of the second operational amplifier U2 is also grounded through the second capacitor C2. The inverting input terminal of the first operational amplifier U1 is electrically connected to the inverting input terminal of the second operational amplifier U2 through the first resistor R1.

[0078] The output terminal of the first operational amplifier U1 is electrically connected to the inverting input terminal of the first operational amplifier U1 through the second resistor R2. The output terminal of the second operational amplifier U2 is electrically connected to the inverting input terminal of the second operational amplifier U2 through the third resistor R3. The output terminal of the first operational amplifier U1 is also electrically connected to the first input terminal of the differential output unit through the fourth resistor R4. The output terminal of the second operational amplifier U2 is also electrically connected to the second input terminal of the differential output unit through the fifth resistor R5.

[0079] In one possible implementation, the differential output unit includes a first differential amplifier U3, a sixth resistor R6, and a seventh resistor R7;

[0080] The non-inverting input terminal of the first differential amplifier U3 serves as the first input terminal of the differential output unit and is electrically connected to the fourth resistor R4. The non-inverting input terminal of the first differential amplifier U3 is also grounded through the sixth resistor R6.

[0081] The inverting input terminal of the first differential amplifier U3 serves as the second input terminal of the differential output unit and is electrically connected to the fifth resistor R5. The inverting input terminal of the first differential amplifier U3 is also electrically connected to the output terminal of the first differential amplifier U3 through the seventh resistor R7.

[0082] The output terminal of the first differential amplifier U3 serves as the output terminal of the differential output unit and is electrically connected to the differential amplified voltage signal input terminal of the analog-to-digital processing module.

[0083] In one possible implementation, the analog-to-digital processing module is used to perform analog processing on the differential amplified voltage signal received from the differential amplification module, and convert the differential amplified voltage signal after analog processing into a digital signal to form a voltage measurement digital signal, and output the voltage measurement digital signal to the digital signal input terminal of the data processing module through the digital signal output terminal of the analog-to-digital processing module.

[0084] The data processing module is used to calculate the effective voltage value, peak voltage value, voltage frequency and / or voltage harmonics of the voltage measurement digital signal received from the analog-to-digital processing module, and send the calculation results as measurement result data to the external interaction module through the measurement result data output terminal of the data processing module.

[0085] The external interaction module includes a result display unit and an early warning unit. The result display unit is used to receive the measurement result data and visualize the measurement result data. The early warning unit is used to compare the measurement result data with a preset standard measurement result range in the early warning unit, and generate an alarm message when the measurement result data exceeds the standard measurement result range, and send the alarm message to the result display unit for visualization.

[0086] Secondly, the present invention provides a non-contact voltage measurement method for surgical devices based on capacitive coupling, which is implemented by a non-contact voltage measurement system for surgical devices based on capacitive coupling as described in the first aspect or any possible embodiment of the first aspect, wherein the method may include, but is not limited to, the following steps S1-S5:

[0087] S1. Connect the voltage acquisition terminal of the PCB capacitor coupling module to the high voltage output terminal of the surgical device under test, and acquire the high voltage output signal of the surgical device under test as the original measurement signal;

[0088] S2. The original measurement signal is coupled in a non-contact measurement manner through the measurement capacitor on the PCB capacitor coupling module to generate a differential signal;

[0089] S3. Input the differential signal into the differential amplification module, and use the differential amplification module to differentially amplify the differential signal to achieve common-mode noise suppression, so as to obtain a differential amplified voltage signal;

[0090] S4. The differential amplified voltage signal is processed by analog-to-digital conversion through the analog-to-digital processing module to obtain a voltage measurement digital signal, and the voltage measurement digital signal is output to the data processing module.

[0091] S5. The voltage measurement digital signal is processed by the data processing module to perform voltage data calculation, and the calculated result is output as the measurement result data to the external interaction module for data interaction to complete the voltage measurement.

[0092] Finally, it should be noted that the above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A capacitive coupling-based non-contact voltage measurement system for surgical equipment, comprising: The application relates to a PCB capacitive coupling module, a differential amplification module, an analog-digital processing module and a data processing module. The voltage collection end of the PCB capacitive coupling module is electrically connected with the high-voltage output end of a to-be-measured surgical equipment, the coupling output end of the PCB capacitive coupling module is coupled with the differential signal input end of the differential amplification module, the differential amplification voltage signal output end of the differential amplification module is electrically connected with the differential amplification voltage signal input end of the analog-digital processing module, the digital signal output end of the analog-digital processing module is electrically connected with the digital signal input end of the data processing module, and the measurement result data output end of the data processing module is in communication connection with an external interaction module. The measurement capacitor is integrated in the PCB capacitive coupling module, is used for non-contact measurement of an original voltage signal received from the high-voltage output end of the to-be-measured surgical equipment, generates a differential signal, and outputs the differential signal to the differential signal input end of the differential amplification module. The to-be-measured surgical equipment is a radio frequency surgical equipment or a high-frequency surgical equipment, and the high-voltage output end of the to-be-measured surgical equipment is the firewire output end and the zero line output end of the radio frequency surgical equipment or the firewire output end and the zero line output end of the high-frequency surgical equipment.

2. The capacitive coupled based surgical device non-contact voltage measurement system of claim 1, wherein, The PCB capacitive coupling module comprises a first PCB capacitive coupling unit and a second PCB capacitive coupling unit.

3. The capacitive coupled based surgical device non-contact voltage measurement system of claim 2, wherein, The voltage collection end of the first PCB capacitive coupling unit is electrically connected with the firewire output end of the radio frequency surgical equipment or the firewire output end of the high-frequency surgical equipment, and the coupling output end of the first PCB capacitive coupling unit is coupled with the differential signal input end of the differential amplification module. The voltage collection end of the second PCB capacitive coupling unit is electrically connected with the zero line output end of the radio frequency surgical equipment or the zero line output end of the high-frequency surgical equipment, and the coupling output end of the second PCB capacitive coupling unit is coupled with the differential signal input end of the differential amplification module. The first PCB capacitive coupling unit and the second PCB capacitive coupling unit both comprise an integrated measurement capacitor.

4. The capacitive coupled based surgical device non-contact voltage measurement system of claim 3, wherein, The measurement capacitor is a parallel plate capacitor, the input end of the measurement capacitor is used as the voltage collection end of the PCB capacitive coupling module and is electrically connected with the high-voltage output end of the to-be-measured surgical equipment, and the output end of the measurement capacitor is used as the coupling output end of the PCB capacitive coupling module and is coupled with the differential signal input end of the differential amplification module. The measurement capacitor is composed of a high-voltage electrode layer, an insulating medium layer and a coupling layer.

5. The capacitive coupled based surgical device non-contact voltage measurement system of claim 1, wherein, The high-voltage electrode layer is arranged on one side of the insulating medium layer, the coupling layer is arranged on the other side of the insulating medium layer, the high-voltage electrode layer and the coupling layer are arranged in parallel to form a parallel plate capacitor, the input end of the measurement capacitor is arranged on the high-voltage electrode layer, and the output end of the measurement capacitor is arranged on the coupling layer. ​ ​ 6. The capacitive coupled based surgical device non-contact voltage measurement system of claim 5, wherein, The insulating medium layer is made of FR-4 standard insulating material or high-frequency laminated material Rogers 4350B, one side of the coupling layer close to the insulating medium layer is provided with two parallel and symmetrically arranged copper foils, and the other side of the coupling layer away from the insulating medium layer is provided with a windowed ground layer. The windowed ground layer comprises two windowed positions, and the two windowed positions are arranged in correspondence with the positions of the two parallel and symmetrically arranged copper foils.

7. The capacitive coupled based surgical device non-contact voltage measurement system of claim 1, wherein, The differential amplification module comprises an operational amplifier input unit and a differential output unit. The input end of the operational amplifier input unit is coupled to the differential signal input end of the differential amplification module, and is coupled to the coupling output end of the PCB capacitor coupling module; the output end of the operational amplifier input unit is electrically connected to the input end of the differential output unit; the output end of the differential output unit is the differential amplification voltage signal output end of the differential amplification module, and is electrically connected to the differential amplification voltage signal input end of the analog-digital processing module.

8. The capacitive coupled based surgical device non-contact voltage measurement system of claim 7, wherein, The operational amplifier input unit comprises a first operational amplifier, a second operational amplifier, a first capacitor, a second capacitor, a first resistor, a second resistor, a third resistor, a fourth resistor and a fifth resistor. The non-inverting input end of the first operational amplifier is coupled to the differential signal input end of the differential amplification module, and is coupled to the coupling output end of the PCB capacitor coupling module; the non-inverting input end of the first operational amplifier is also connected to ground through the first capacitor; the non-inverting input end of the second operational amplifier is also the differential signal input end of the differential amplification module, and is coupled to the coupling output end of the PCB capacitor coupling module; the non-inverting input end of the second operational amplifier is also connected to ground through the second capacitor; and the inverting input end of the first operational amplifier is electrically connected to the inverting input end of the second operational amplifier through the first resistor. The output end of the first operational amplifier is electrically connected to the inverting input end of the first operational amplifier through the second resistor; the output end of the second operational amplifier is electrically connected to the inverting input end of the second operational amplifier through the third resistor; and the output end of the first operational amplifier is also electrically connected to the first input end of the differential output unit through the fourth resistor, and the output end of the second operational amplifier is also electrically connected to the second input end of the differential output unit through the fifth resistor.

9. The capacitive coupled based surgical device non-contact voltage measurement system of claim 8, wherein, The differential output unit comprises a first differential amplifier, a sixth resistor and a seventh resistor. The non-inverting input end of the first differential amplifier is the first input end of the differential output unit, and is electrically connected to the fourth resistor; the non-inverting input end of the first differential amplifier is also connected to ground through the sixth resistor. The inverting input end of the first differential amplifier is the second input end of the differential output unit, and is electrically connected to the fifth resistor; the inverting input end of the first differential amplifier is also electrically connected to the output end of the first differential amplifier through the seventh resistor. The output end of the first differential amplifier is the output end of the differential output unit, and is electrically connected to the differential amplification voltage signal input end of the analog-digital processing module.

10. The capacitive coupled based surgical device non-contact voltage measurement system of claim 1, wherein, The analog-digital processing module is configured to perform analog processing on the differential amplification voltage signal received from the differential amplification module, convert the differential amplification voltage signal after the analog processing into a digital signal, form a voltage measurement digital signal, and output the voltage measurement digital signal to a digital signal input end of the data processing module through a digital signal output end of the analog-digital processing module; The data processing module is configured to perform voltage effective value calculation, voltage peak value calculation, voltage frequency calculation and / or voltage harmonic calculation on the voltage measurement digital signal received from the analog-digital processing module, and send the calculation results obtained through the calculation as measurement result data to the external interaction module through a measurement result data output end of the data processing module; The external interaction module includes a result display unit and a warning unit, wherein the result display unit is configured to receive the measurement result data and visually display the measurement result data, and the warning unit is configured to compare the measurement result data with a standard measurement result interval preset in the warning unit, generate an alarm information when the measurement result data exceeds the standard measurement result interval, and send the alarm information to the result display unit for visual display.

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