CN115844517A - High-frequency surgical system and impedance detection device - Google Patents

Abstract

The invention provides a high-frequency surgical system. The system comprises: a power module forming a surgical circuit with the surgical electrode, the medical object and the two-piece neutral electrode for generating a high frequency current flowing in the surgical circuit to deliver energy to the surgical electrode; a parallel resonant circuit having both ends coupled to one electrode of the two-piece neutral electrode, respectively; an excitation signal source for supplying an excitation signal to the parallel resonant circuit so that a measurement voltage for determining a contact impedance between the two-piece neutral electrode and the medical object is generated across the parallel resonant circuit, wherein a frequency of the excitation signal matches a resonant frequency of the parallel resonant circuit; and the control module is used for adjusting the energy transmitted to the operation electrode by the power module according to the measured voltage, wherein the two-piece neutral electrode, the parallel resonant circuit and the excitation signal source are in the same electrical isolation region. According to the invention, the impedance detection circuit is convenient to modularize, and is beneficial to design simplification and subsequent maintenance and replacement.

Description

High-frequency surgical system and impedance detection device

Technical Field

The present invention relates to the technical field of medical equipment, and more particularly, to a high frequency surgical system and an impedance detection apparatus.

Background

The high-frequency electric knife is an electric surgical instrument for replacing a mechanical scalpel to cut tissues, and the high-frequency high-voltage current generated by the tip of an effective surgical electrode is contacted with an organism to heat the tissues so as to realize the separation and solidification of the tissues of the organism and achieve the aims of cutting and hemostasis.

The high-frequency electric knife comprises a high-frequency operation system (a host system) and an externally connected operation electrode and a neutral electrode. The neutral electrode is part of the application and needs to be isolated from the control circuitry in the hf surgical system. In addition, in the operation process, because the medical object is in an anesthesia state and can not sense the skin heating and burning, the contact condition of the neutral electrode and the medical object needs to be continuously detected, and the potential safety hazard is avoided.

Currently, it is common to isolate the impedance detection circuit from the neutral electrode in high frequency surgical systems so that the impedance detection circuit is in the same electrically isolated region as the control circuit. However, in this method, the circuit structure in the high-frequency surgical system is complicated, the impedance detection circuit cannot be clearly divided in function, and modularization cannot be realized, which is inconvenient for design and subsequent maintenance.

Disclosure of Invention

In this summary, concepts in a simplified form are introduced that are further described in the detailed description. This summary of the invention is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used as an aid in determining the scope of the claimed subject matter.

In view of the above technical problem, a first aspect of the present invention proposes an hf surgical system comprising:

a power module forming a surgical circuit with a surgical electrode, a medical object, and a two-piece neutral electrode for generating a high frequency current flowing in the surgical circuit to deliver energy to the surgical electrode;

a parallel resonant circuit having both ends coupled to one electrode of the two-piece neutral electrode, respectively;

an excitation signal source coupled to the parallel resonant circuit for providing an excitation signal to the parallel resonant circuit such that a measurement voltage for determining a contact impedance between the two-piece neutral electrode and the medical subject is generated across the parallel resonant circuit, wherein a frequency of the excitation signal matches a resonant frequency of the parallel resonant circuit;

a control module coupled to the parallel resonant circuit. For adjusting the energy delivered by the power module to the surgical electrode based on the measured voltage,

wherein the two-piece neutral electrode, the parallel resonant circuit, and the excitation signal source are in the same electrically isolated region.

According to some embodiments of the invention, the parallel resonant circuit comprises:

an inductor having both ends connected to one electrode of the double-sheet neutral electrode, respectively; and

the first end of the first capacitor is connected to one end of the inductor, the second end of the second capacitor is connected to the other end of the inductor, and the first end of the first capacitor, the second end of the second capacitor and the first end of the second capacitor are connected and then connected to the power module so as to shunt the high-frequency current.

According to some embodiments of the invention, the high frequency surgical system further comprises:

a signal processing module coupled to the parallel resonant circuit for processing the measurement voltage;

a measurement module, coupled to the signal processing module, for determining a measurement result of the contact impedance from the processed measurement voltage; and

an isolation transmission module coupled between the measurement module and the control module for electrically isolating the measurement module from the control module and transmitting the measurement results to the control module.

According to some embodiments of the invention, determining the measurement of the contact impedance from the processed measurement voltage comprises: determining an impedance value of the contact impedance according to the processed measurement voltage, determining whether the impedance value exceeds a preset threshold, and taking the determination result as the measurement result, and,

adjusting the energy delivered by the power module to the surgical electrode based on the measured voltage comprises: and if the judgment result shows that the impedance value exceeds the preset threshold value, cutting off or reducing the energy transmitted to the operation electrode by the power module.

According to some embodiments of the invention, the measurement module is further configured to issue a warning signal when the impedance value exceeds the preset threshold.

According to some embodiments of the invention, determining the measurement of the contact impedance from the processed measurement voltage comprises: determining an impedance value of the contact impedance from the processed measurement voltage and taking the impedance value as the measurement result, and,

adjusting the energy delivered by the power module to the surgical electrode based on the measured voltage comprises: and judging whether the impedance value exceeds a preset threshold value, and if so, cutting off or reducing the energy transmitted to the operation electrode by the power module.

According to some embodiments of the invention, the signal processing module comprises:

the amplifying circuit is used for amplifying the measuring voltage; and

and the analog-to-digital conversion circuit is used for performing analog-to-digital conversion on the amplified measurement voltage to obtain the processed measurement voltage.

According to some embodiments of the invention, the parallel resonant circuit, the excitation signal source, the signal processing module, the measurement module and the isolated transmission module are integrated on the same circuit board.

According to some embodiments of the invention, the high frequency surgical system further comprises:

a signal processing module coupled to the parallel resonant circuit for processing the measurement voltage;

an isolation transmission module coupled between the signal processing module and the control module and configured to electrically isolate the signal processing module from the control module and transmit the processed measurement voltage to the control module, and,

adjusting the energy delivered by the power module to the surgical electrode based on the measured voltage comprises: determining an impedance value of the contact impedance according to the processed measurement voltage, judging whether the impedance value exceeds a preset threshold value, and cutting off or reducing energy transmitted to the operation electrode by the power module if the impedance value exceeds the preset threshold value.

A second aspect of the present invention proposes an impedance detection apparatus for a high frequency surgical system including a power module and a control module, the power module forming a surgical loop with a surgical electrode, a medical object and a two-piece neutral electrode, and being configured to generate a high frequency current flowing in the surgical loop to deliver energy to the surgical electrode, characterized by comprising:

a parallel resonant circuit having both ends coupled to one electrode of the two-piece neutral electrode, respectively;

an excitation signal source coupled to the parallel resonant circuit for providing an excitation signal to the parallel resonant circuit to cause a measurement voltage to be generated across the parallel resonant circuit for determining a contact impedance between the two-piece neutral electrode and the medical subject, thereby causing the control module to adjust the power module to deliver energy to the surgical electrode based on the measurement voltage,

wherein a frequency of the excitation signal matches a resonance frequency of the parallel resonance circuit, and the two-piece neutral electrode, the parallel resonance circuit, and the excitation signal source are in the same electrically isolated region.

According to some embodiments of the invention, the parallel resonant circuit comprises:

an inductor having both ends connected to one electrode of the double-sheet neutral electrode, respectively; and

the first end of the first capacitor is connected to one end of the inductor, the second end of the second capacitor is connected to the other end of the inductor, and the second end of the first capacitor is connected with the first end of the second capacitor and then connected to the power module so as to shunt the high-frequency current.

According to some embodiments of the invention, the impedance detection apparatus further comprises:

a signal processing module coupled to the parallel resonant circuit for processing the measurement voltage;

a measurement module, coupled to the signal processing module, for determining a measurement result of the contact impedance from the processed measurement voltage; and

an isolation transmission module coupled between the measurement module and the control module for electrically isolating the measurement module from the control module and transmitting the measurement results to the control module.

According to some embodiments of the invention, determining the measurement of the contact impedance from the processed measurement voltage comprises: determining an impedance value of the contact impedance from the processed measurement voltage, determining whether the determined impedance value exceeds a preset threshold, and regarding the impedance value and the determination result as the measurement result, and,

adjusting the energy delivered by the power module to the surgical electrode based on the measured voltage comprises: and if the judgment result shows that the impedance value exceeds the preset threshold value, cutting off or reducing the energy transmitted to the operation electrode by the power module.

According to some embodiments of the invention, the measurement module is further configured to issue a warning signal when the impedance value exceeds the preset threshold.

According to some embodiments of the invention, determining the measurement of the contact impedance from the processed measurement voltage comprises: determining an impedance value of the contact impedance from the processed measurement voltage and taking the impedance value as the measurement result, and,

adjusting the energy delivered by the power module to the surgical electrode based on the measured voltage comprises: and judging whether the impedance value exceeds a preset threshold value, and if so, cutting off or reducing the energy transmitted to the operation electrode by the power module.

According to some embodiments of the invention, the signal processing module comprises:

the amplifying circuit is used for amplifying the measuring voltage; and

and the analog-to-digital conversion circuit is used for performing analog-to-digital conversion on the amplified measurement voltage to obtain the processed measurement voltage.

According to some embodiments of the invention, the parallel resonant circuit, the excitation signal source, the signal processing module, the measurement module and the isolated transmission module are integrated on the same circuit board.

According to some embodiments of the invention, the impedance detection apparatus further comprises:

a signal processing module coupled to the parallel resonant circuit for processing the measurement voltage;

an isolation transmission module coupled between the signal processing module and the control module and configured to electrically isolate the signal processing module from the control module and transmit the processed measurement voltage to the control module, and,

adjusting the energy delivered by the power module to the surgical electrode based on the measured voltage comprises: determining an impedance value of the contact impedance according to the processed measurement voltage, judging whether the impedance value exceeds a preset threshold value, and cutting off or reducing energy transmitted to the operation electrode by the power module if the impedance value exceeds the preset threshold value.

According to the invention, the neutral electrode, the parallel resonant circuit and the excitation signal source are positioned in the same electrical isolation area, the part for impedance detection can be clearly and clearly divided, the circuit structure is simple, the modularization is convenient, and the design simplification and the subsequent maintenance and replacement are facilitated.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the description below are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.

In the drawings:

FIG. 1 shows a schematic block diagram of the architecture of an HF surgery system according to an embodiment of the invention;

FIG. 2 shows a schematic block diagram of a high frequency surgical system according to an embodiment of the present invention;

FIG. 3 shows another schematic block diagram of a high frequency surgical system according to an embodiment of the present invention;

fig. 4 shows a further schematic block diagram of a high-frequency surgical system according to an embodiment of the invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, exemplary embodiments according to the present invention will be described in detail below with reference to the accompanying drawings. It is to be understood that the described embodiments are merely a subset of embodiments of the invention and not all embodiments of the invention, with the understanding that the invention is not limited to the example embodiments described herein. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the invention described in the present application without inventive step, shall fall within the scope of protection of the present invention.

In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention. It will be apparent, however, to one skilled in the art, that the present invention may be practiced without one or more of these specific details. In other instances, well-known features have not been described in order to avoid obscuring the invention.

Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. For the connection between the units or modules in the drawings, it is only for convenience of description that at least the units or modules at both ends of the connection are in communication with each other, and it is not intended to limit the un-connected units from being unable to communicate with each other.

Before describing embodiments of the present invention, some terms referred to in the present invention are first explained to better understand the present invention.

As used herein, the terms "connected," "coupled," or "coupled," and similar terms are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The terms "a," "an," "a," or "the" and similar terms do not denote a limitation of quantity, but rather denote the presence of at least one.

As used herein, the terms "comprising," "including," and the like are to be construed as open-ended terms, i.e., "including/including but not limited to," meaning that additional content may be included. The term "based on" is "based, at least in part, on". The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment," and the like. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

In order to provide a thorough understanding of the present invention, a detailed structure will be set forth in the following description in order to explain the present invention. Alternative embodiments of the invention are described in detail below, however, the invention may be practiced in other embodiments that depart from these specific details.

The invention provides a high-frequency surgical system. In the high-frequency operation system, the parallel resonance circuit, the excitation signal source and the double-sheet type neutral electrode are in the same electric isolation area, the part for impedance detection can be clearly and clearly divided, the circuit structure is simple, modularization is convenient, and design simplification and follow-up maintenance and replacement are facilitated.

In the following, the principle of the high-frequency surgical system proposed by the invention is first described with reference to fig. 1. Fig. 1 shows a block diagram of the high-frequency surgery system according to an exemplary embodiment of the invention. The hfsurgical system 100 includes anexcitation signal source 10, a parallelresonant circuit 11, acontrol module 12, and apower module 13. It will be appreciated that only a portion of the circuit blocks of the hfsurgical system 100 are shown in fig. 1, and that many other circuit blocks may be included.

In use of the hfsurgical system 100, thepower module 13 is connected to a power supply (not shown in fig. 1), the output of which is connected on the one hand to theelectrode interface 101a for thesurgical electrode 14 and on the other hand to the electrode interfaces 101b and 101c for the twoelectrodes 15a and 15b of the two-piece neutral electrode. Theexcitation signal source 10 is coupled to the parallelresonant circuit 11, thecontrol module 12 is coupled to the parallelresonant circuit 11 and thepower module 13, and both ends of the parallelresonant circuit 11 are connected to the electrode interfaces 101b and 101c, respectively. As shown in fig. 1, thesurgical electrode 14 is connected to anelectrode interface 101a, and the twoelectrodes 15a and 15b are connected to the electrode interfaces 101b and 101c, respectively, and applied to the skin of themedical subject 102. Theneutral electrodes 15a and 15b each have a contact surface and are in electrical contact with the skin of themedical subject 102.

Thepower module 13 forms a surgical circuit with thesurgical electrode 14, themedical subject 102, and the twoelectrodes 15a and 15 b. Thepower module 13 converts the alternating current fed from the power supply into direct current and converts the direct current into high-frequency current for high-frequency surgery. High frequency current flows in the surgical circuit, delivering energy to thesurgical electrode 14, and the operator performs cutting and/or coagulation operations on themedical object 102 using thesurgical electrode 14. A contact impedance is formed between the contact surfaces of the twoelectrodes 15a and 15b and themedical object 102. Theexcitation signal source 10 supplies an excitation signal to the parallelresonant circuit 11, so that a measurement voltage of the contact impedance is generated across the parallelresonant circuit 11. The frequency of the excitation signal matches the resonance frequency of theparallel resonance circuit 11. For example, the frequency of the excitation signal is substantially equal to the resonance frequency of theparallel resonance circuit 11. Alternatively, the frequency deviation of the frequency of the excitation signal from the resonance frequency of theparallel resonance circuit 11 is within a certain range. Thecontrol module 12 adjusts the energy delivered by thepower module 13 to thesurgical electrode 14 based on the measured voltage. The adjustment energy may be, for example, switching off, increasing or decreasing energy.

In the present invention, the twoelectrodes 15a and 15b of the two-piece neutral electrode, theexcitation signal source 10, and the parallel resonant circuit are in the same electrically isolated region. Therefore, the impedance detection circuit of the double-piece neutral electrode can be clearly and clearly divided, so that the modular design is convenient, and the design simplification and the subsequent maintenance and replacement are facilitated.

Referring next to fig. 2, fig. 2 shows a schematic block diagram of an hf surgical system according to an embodiment of the present invention. FIG. 2 does not show surgical and neutral electrodes, but with R_L Representing the equivalent contact impedance between the neutral electrode and the medical subject. In contrast to fig. 1, the hfsurgical system 200 of fig. 2 further comprises a signal processing module 20 coupled to the parallelresonant circuit 11, ameasurement module 21 coupled to the signal processing module 20 and an isolation transmission module 22 coupled between themeasurement module 21 and thecontrol module 12. The measuringmodule 21 may be, for example, a Microprocessor (MCU).

Specifically, as shown in fig. 2, theexcitation signal source 10 includes an alternating current source and a current limiting resistance R₁ . In parallelTheresonant circuit 11 comprises an inductance L₁ And with the inductance L₁ First capacitors C connected in parallel₁ And C₂ . Inductor L₁ One end of which is connected to theelectrode interface 101b for one electrode of the two-piece neutral electrode, the current limiting resistor R₁ And a first capacitor C₁ First terminal of (1), inductance L₁ Is connected to an electrode interface 101C for the other electrode and to a second capacitance C₂ And to ground. A first capacitor C₁ Second terminal and second capacitor C₂ Are connected to thepower module 13, i.e. the first capacitor C₁ And a second capacitor C₂ Connected in series in the operation loop and used for shunting the high-frequency current output by thepower module 13. In the operation circuit, the high-frequency current outputted from thepower module 13 flows through the operation electrode, the medical object and the neutral electrode (none of which is shown in fig. 2), and then flows through the first capacitor C₁ And a second capacitor C₂ And back to thepower module 13. A first capacitor C₁ And a second capacitor C₂ Is substantially equal so that the high frequency currents flowing through the two electrodes of the two-piece neutral electrode are substantially equal. Theexcitation signal source 10 outputs an excitation signal having a frequency substantially equal to the resonance frequency of the parallelresonant circuit 11, which may range, for example, from 60k to 100 k. The resonant frequency may be defined by an inductance L₁ And the first capacitor C₁ A second capacitor C₂ Is determined.

During use of the hf-surgery system 200, theexcitation signal source 10 applies an excitation signal to the parallelresonant circuit 11, in the ideal case the impedance of the parallelresonant circuit 11 being infinite at the resonant frequency. Due to the parallelresonant circuit 11 and the contact resistance R_L The reciprocal value of the total impedance of the parallel circuit of (2) is determined by the reciprocal value of the impedance of theparallel resonance circuit 11 and the contact impedance R_L So that the total impedance of the parallel circuit is substantially equal to the contact impedance R_L The impedance value of (2). The measured voltage across the parallelresonant circuit 11 is substantially equal to the contact impedance R_L The voltage drop across it, and thus can be used to determine the contact resistance R_L The impedance value of (2).

Signal processingThe processing block 20 receives the measurement voltage from the parallelresonant circuit 11, processes the measurement voltage, and inputs the processed measurement voltage to themeasurement block 21. The measuringmodule 21 determines the contact resistance R from the processed measurement voltage_L The measurement result of (1). The isolated transmission module 22 electrically isolates themeasurement module 21 from thecontrol module 12. That is, the neutral electrode, theexcitation signal source 10, the parallelresonant circuit 11, the signal processing module 20, and themeasurement module 21 are in the same electrically isolated region. The isolation transmission module 22 also transmits the measurement results to thecontrol module 12. The isolation transmission module 22 may include an analog isolation element such as a transformer, a digital isolation element such as an opto-coupler or a magnetic coupler, or a combination thereof. Thecontrol module 12 adjusts the energy delivered by thepower module 13 to the surgical electrode based on the measurement.

In some embodiments,measurement module 21 determines contact resistance R from the processed measurement voltage_L The impedance value of (2). Specifically, the measuringmodule 21 divides the voltage value of the measuring voltage by the current value of the excitation signal to obtain the contact resistance R_L The impedance value of (2). Thereafter, the measuringmodule 21 will contact the resistance R_L Comparing the impedance value with a preset threshold value to judge the contact impedance R_L And transmits the determination result as a measurement result to thecontrol module 12 via the isolated transmission module 22. If the determination indicates that the impedance value exceeds the predetermined threshold, thecontrol module 12 shuts off or reduces the energy delivered to the surgical electrode by thepower module 13. Thus, no high-frequency current flows, or only a small high-frequency current flows, in the surgical circuit, preventing skin burns that may occur at the contact surface of the neutral electrode.

In some embodiments, themeasurement module 21 determines the contact resistance R from the processed measurement voltage_L The impedance value of (2). Specifically, themeasurement module 21 divides the voltage value of the measurement voltage by the current value of the excitation signal to obtain the contact resistance R_L The impedance value of (2). The impedance value is then transmitted as a measurement result to thecontrol module 12 via the isolated transmission module 22. Thecontrol module 12 will contact the impedance R_L Comparing the impedance value with a preset threshold value to judge the contact impedance R_L Whether the impedance value exceedsAnd (4) presetting a threshold value. If the impedance value exceeds a preset threshold, thecontrol module 12 shuts off or reduces the energy delivered by thepower module 13 to the surgical electrode. Thus, no high-frequency current flows, or only a small high-frequency current flows, in the surgical circuit, preventing skin burns that may occur at the contact surface of the neutral electrode.

In some embodiments, the signal processing module 20 includes an amplification circuit and an analog-to-digital conversion circuit. The amplifying circuit is used for amplifying the measuring voltage, and the analog-to-digital conversion circuit is used for performing analog-to-digital conversion on the amplified measuring voltage to obtain the processed measuring voltage. In other embodiments, the hf surgical system may also employ purely analog circuitry, and the signal processing module 20 may include only amplification circuitry and no analog-to-digital conversion circuitry.

In some embodiments, themeasurement module 21 may measure the contact resistance R_L Is above a preset threshold value, a warning signal is emitted. The warning signal may be a light signal or a sound signal, which is visually or audibly noticeable to the operator. For example, themeasurement module 21 may drive a light to flash and/or sound through a speaker. In other embodiments, a warning signal may also be issued by thecontrol module 12.

In some embodiments, theexcitation signal source 10, the parallelresonant circuit 11, the signal processing module 20, themeasurement module 21, and the isolation transmission module 22 may be integrated on the same circuit board, and a communication interface for the isolation transmission module 22 to communicate with thecontrol module 12 is provided. In the installation and subsequent maintenance stages, the communication interface of the circuit board can be directly connected or disconnected with the communication interface of thecontrol module 12, so that the circuit board can be installed or replaced.

In some embodiments,measurement module 21 is used in addition to detecting contact resistance R_L Can also be used to implement more functions. For example, themeasurement module 21 may detect other circuit parameters related to the neutral electrode (e.g., a current value of a high-frequency current flowing through each electrode of the two-piece neutral electrode), and may associate the detection result with the contact resistance R_L Are transmitted to thecontrol module 12 together with the measurement results.

Referring next to figure 3, figure 3 shows another schematic block diagram of an hf-surgery system according to an embodiment of the present invention. In fig. 3, the same reference numerals as in fig. 1 and 2 denote the same or similar elements or modules, which perform the same or similar functions and are not described again here. Only the differences between the hf-surgery system 300 of fig. 3 and the hf-surgery system 200 of fig. 2 will be described below.

In contrast to the hfsurgical system 200, in the hfsurgical system 300, the isolation transmission module 22 is coupled between the signal processing module 20 and themeasurement module 21. That is, after the signal processing module 20 processes the measurement voltage, the processed measurement voltage is transmitted to themeasurement module 21 through the isolation transmission module 22 to perform the contact resistance R_L The impedance value of (2) is calculated.

In other embodiments, the isolation transmission module 22 may also be coupled between the parallelresonant circuit 11 and the signal processing module 20, or between two circuits (such as an amplifying circuit and an analog-to-digital conversion circuit) in the signal processing module 20, as long as the neutral electrode, theexcitation signal source 10 and the parallelresonant circuit 11 are in the same electrically isolated region.

Referring next to fig. 4, fig. 4 shows yet another schematic block diagram of a high frequency surgical system according to an embodiment of the present invention. In fig. 4, the same reference numerals as in fig. 1 and 2 denote the same or similar elements or modules, which perform the same or similar functions, and are not described again here. Only the differences between the hf-surgery system 400 of fig. 4 and the hf-surgery system 200 of fig. 2 will be described below.

In contrast to the hfsurgical system 200, the hfsurgical system 400 of fig. 4 does not comprise a measurement module. An isolated transmission module 22 is coupled between the signal processing module 20 and thecontrol module 12. In other embodiments, the isolation transmission module 22 may also be coupled between the parallelresonant circuit 11 and the signal processing module 20, or between two circuits (such as an amplifying circuit and an analog-to-digital conversion circuit) in the signal processing module 20, as long as the neutral electrode, theexcitation signal source 10 and the parallelresonant circuit 11 are in the same electrically isolated region.

At high frequenciesDuring the operation of thesurgical system 400, the signal processing module 20 receives the measurement voltage from the parallelresonant circuit 11, processes the measurement voltage, and obtains a processed measurement voltage. The isolation transmission module 22 electrically isolates the signal processing module 20 from thecontrol module 12. That is, the neutral electrode, theexcitation signal source 10, the parallelresonant circuit 11, and the signal processing module 20 are in the same electrically isolated region. The isolation transmission module 22 also transmits the processed measurement voltage to thecontrol module 12. Thecontrol module 12 determines an impedance value of the contact impedance from the processed measured voltage. Specifically, thecontrol module 12 divides the voltage value of the measurement voltage by the current value of the excitation signal to obtain the contact resistance R_L The impedance value of (2). Thereafter, thecontrol module 12 will contact the resistance R_L Comparing the impedance value with a preset threshold value to judge the contact impedance R_L Is greater than a preset threshold. If the impedance value exceeds the predetermined threshold, thecontrol module 12 cuts off or reduces the energy delivered to the surgical electrode by thepower module 13. Thus, no high-frequency current flows, or only a small high-frequency current flows, in the surgical circuit, preventing skin burns that may occur at the contact surface of the neutral electrode.

In some embodiments, thecontrol module 12 may determine the contact resistance R_L Is above a preset threshold value, a warning signal is emitted. The warning signal may be a light signal or a sound signal, which is visually or audibly noticeable to the operator. For example, thecontrol module 12 may drive a light to flash and/or sound through a speaker.

In some embodiments, theexcitation signal source 10, the parallelresonant circuit 11, the signal processing module 20, and the isolation transmission module 22 may be integrated on the same circuit board, and a communication interface for the isolation transmission module 22 to communicate with thecontrol module 12 is provided. In the installation and subsequent maintenance stages, the communication interface of the circuit board can be directly connected or disconnected with the communication interface of thecontrol module 12, so that the circuit board can be installed or replaced.

The invention also provides an impedance detection device for the high-frequency surgical system. In the impedance detection device, the parallel resonance circuit, the excitation signal source and the neutral electrode are in the same electric isolation area, the circuit structure is simpler, the part for impedance detection can be clearly and clearly divided, the modularization is convenient, and the design simplification and the subsequent maintenance and replacement are facilitated.

Referring to fig. 1, theimpedance detection apparatus 103 in fig. 1 includes anexcitation signal source 10 and aparallel circuit 11. Theexcitation signal source 10 is coupled to a parallelresonant circuit 11, and both ends of the parallelresonant circuit 11 are connected to electrodeinterfaces 101b and 101c for twoelectrodes 15a and 15b of a two-piece neutral electrode, respectively. Theexcitation signal source 10 supplies an excitation signal to the parallelresonant circuit 11 so that a measurement voltage of the contact impedance is generated across the parallelresonant circuit 11. The frequency of the excitation signal matches the resonance frequency of theparallel resonance circuit 11, for example, the frequency of the excitation signal is substantially equal to the resonance frequency of theparallel resonance circuit 11. Thecontrol module 12 adjusts the energy delivered by thepower module 13 to thesurgical electrode 14 based on the measured voltage. The adjustment energy may be, for example, switching off, increasing or decreasing energy.

In the present invention, the neutral electrode, theexcitation signal source 10, and the parallel resonant circuit are in the same electrically isolated region. Therefore, the parts used for impedance detection can be clearly and clearly divided, so that the modular design is facilitated, and the design simplification and the subsequent maintenance and replacement are facilitated.

In fig. 2 and 3, compared with theimpedance detection apparatus 103 of fig. 1, theimpedance detection apparatuses 203 and 303 include a signal processing module 20, ameasurement module 21, and an isolation transmission module 22 in addition to theexcitation signal source 10 and theparallel resonance circuit 11. For the detailed description of the functions of the modules, reference may be made to the foregoing description, and further description is omitted here.

In fig. 4, compared with theimpedance detecting apparatus 103 of fig. 1, theimpedance detecting apparatus 403 includes a signal processing module 20 and an isolated transmission module 22 in addition to theexcitation signal source 10 and theparallel resonance circuit 11. For the detailed description of the functions of the modules, reference may be made to the foregoing description, and further description is omitted here.

In the embodiments provided in the present invention, it should be understood that the disclosed system, apparatus and method may be implemented in other ways. For example, the above-described embodiments of the apparatus are merely illustrative, and for example, a division of a unit or a module is merely a logical division, and an actual implementation may have another division, for example, a plurality of units, modules or components may be combined or integrated into another system or apparatus, or some features may be omitted, or not executed.

In the description provided herein, numerous specific details are set forth. However, it is understood that embodiments of the invention may be practiced without these specific details. In some embodiments, well-known methods, structures and techniques have not been shown in detail in order not to obscure an understanding of this description.

Similarly, it should be appreciated that in the description of exemplary embodiments of the invention, various features of the invention are sometimes grouped together in a single embodiment, figure, or description thereof for the purpose of streamlining the invention and aiding in the understanding of one or more of the various inventive aspects. However, the method of the present invention should not be construed to reflect the intent: that the invention as claimed requires more features than are expressly recited in each claim. Rather, as the following claims reflect, inventive aspects lie in less than all features of a single disclosed embodiment. Thus, the claims following the detailed description are hereby expressly incorporated into this detailed description, with each claim standing on its own as a separate embodiment of this invention.

Those skilled in the art will appreciate that all of the features disclosed in this specification (including any accompanying claims, abstract and drawings), and all of the processes, elements or modules of any system, apparatus or method so disclosed, may be combined in any combination, except combinations where such features are mutually exclusive. Each feature disclosed in this specification (including any accompanying claims, abstract and drawings) may be replaced by alternative features serving the same, equivalent or similar purpose, unless expressly stated otherwise.

Furthermore, those skilled in the art will appreciate that while some embodiments described herein include some features included in other embodiments, rather than other features, combinations of features of different embodiments are meant to be within the scope of the invention and form different embodiments. For example, in the claims, any of the claimed embodiments may be used in any combination.

It should also be noted that the above-mentioned embodiments illustrate rather than limit the invention, and that those skilled in the art will be able to design alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. The invention may be implemented by means of hardware comprising several distinct elements, and by means of a suitably programmed computer. In the unit claims enumerating several means, several of these means can be embodied by one and the same item of hardware. The usage of the words first, second and third, etcetera do not indicate any ordering. These words may be interpreted as names.

The above description is only for the specific embodiment or the description of the specific embodiment, and the protection scope of the present invention is not limited thereto, and any person skilled in the art can easily think of the changes or replacements within the technical scope of the present disclosure, and shall be covered within the protection scope of the present invention. The protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (18)

1. An hf surgical system, comprising:

a power module forming a surgical circuit with a surgical electrode, a medical object, and a two-piece neutral electrode for generating a high frequency current flowing in the surgical circuit to deliver energy to the surgical electrode;

a parallel resonant circuit having both ends coupled to one electrode of the two-piece neutral electrode, respectively;

an excitation signal source coupled to the parallel resonant circuit and configured to provide an excitation signal to the parallel resonant circuit such that a measurement voltage for determining a contact impedance between the two-piece neutral electrode and the medical subject is generated across the parallel resonant circuit, wherein a frequency of the excitation signal matches a resonant frequency of the parallel resonant circuit;

a control module coupled to the parallel resonant circuit and configured to adjust the energy delivered by the power module to the surgical electrode based on the measured voltage,

wherein the two-piece neutral electrode, the parallel resonant circuit, and the excitation signal source are in the same electrically isolated region.

2. The high frequency surgical system of claim 1, wherein the parallel resonant circuit comprises:

an inductor having both ends connected to one electrode of the double-sheet neutral electrode, respectively; and

the first end of the first capacitor is connected to one end of the inductor, the second end of the second capacitor is connected to the other end of the inductor, and the second end of the first capacitor is connected with the first end of the second capacitor and then connected to the power module so as to shunt the high-frequency current.

3. The high frequency surgical system of claim 1, further comprising:

a signal processing module coupled to the parallel resonant circuit for processing the measurement voltage;

a measurement module, coupled to the signal processing module, for determining a measurement result of the contact impedance from the processed measurement voltage; and

an isolation transmission module coupled between the measurement module and the control module for electrically isolating the measurement module from the control module and transmitting the measurement results to the control module.

4. The high frequency surgical system according to claim 3,

determining the measurement of the contact impedance from the processed measurement voltage comprises: determining an impedance value of the contact impedance according to the processed measurement voltage, determining whether the impedance value exceeds a preset threshold, and taking the determination result as the measurement result, and,

adjusting the energy delivered by the power module to the surgical electrode based on the measured voltage comprises: and if the judgment result shows that the impedance value exceeds the preset threshold value, cutting off or reducing the energy transmitted to the operation electrode by the power module.

5. The high frequency surgical system of claim 4, wherein the measurement module is further configured to issue a warning signal when the impedance value exceeds the preset threshold.

6. The hf surgical system of claim 3 wherein determining the measurement of the contact impedance based on the processed measurement voltage comprises: determining an impedance value of the contact impedance from the processed measurement voltage and taking the impedance value as the measurement result, and,

adjusting the energy delivered by the power module to the surgical electrode based on the measured voltage comprises: and judging whether the impedance value exceeds a preset threshold value, and if so, cutting off or reducing the energy transmitted to the operation electrode by the power module.

7. The high frequency surgical system of claim 3, wherein the signal processing module comprises:

the amplifying circuit is used for amplifying the measuring voltage; and

and the analog-to-digital conversion circuit is used for performing analog-to-digital conversion on the amplified measurement voltage to obtain the processed measurement voltage.

8. The high frequency surgical system of claim 3, wherein the parallel resonant circuit, the excitation signal source, the signal processing module, the measurement module, and the isolated transmission module are integrated on a same circuit board.

9. The high frequency surgical system of claim 1, further comprising:

a signal processing module coupled to the parallel resonant circuit for processing the measurement voltage;

an isolation transmission module coupled between the signal processing module and the control module and configured to electrically isolate the signal processing module from the control module and transmit the processed measurement voltage to the control module, and,

adjusting the energy delivered by the power module to the surgical electrode based on the measured voltage comprises: determining an impedance value of the contact impedance according to the processed measurement voltage, judging whether the impedance value exceeds a preset threshold value, and cutting off or reducing energy transmitted to the operation electrode by the power module if the impedance value exceeds the preset threshold value.

10. An impedance detection device for a high frequency surgical system including a power module and a control module, the power module forming a surgical circuit with a surgical electrode, a medical object and a two-piece neutral electrode and being configured to generate a high frequency current flowing in the surgical circuit to deliver energy to the surgical electrode, the impedance detection device comprising:

a parallel resonant circuit having both ends coupled to one electrode of the two-piece neutral electrode, respectively;

an excitation signal source coupled to the parallel resonant circuit and configured to provide an excitation signal to the parallel resonant circuit such that a measurement voltage for determining a contact impedance between the two-piece neutral electrode and the medical subject is generated across the parallel resonant circuit, thereby causing the control module to adjust the power module to deliver energy to the surgical electrode according to the measurement voltage,

wherein a frequency of the excitation signal matches a resonance frequency of the parallel resonance circuit, and the two-piece neutral electrode, the parallel resonance circuit, and the excitation signal source are in the same electrically isolated region.

11. The impedance detection device of claim 10, wherein the parallel resonant circuit comprises:

an inductor having both ends connected to one electrode of the double-sheet neutral electrode, respectively; and

the first end of the first capacitor is connected to one end of the inductor, the second end of the second capacitor is connected to the other end of the inductor, and the second end of the first capacitor is connected with the first end of the second capacitor and then connected to the power module so as to shunt the high-frequency current.

12. The impedance detection device of claim 10, further comprising:

a signal processing module coupled to the parallel resonant circuit for processing the measurement voltage;

a measurement module, coupled to the signal processing module, for determining a measurement of the contact impedance from the processed measurement voltage; and

an isolation transmission module coupled between the measurement module and the control module for electrically isolating the measurement module from the control module and transmitting the measurement results to the control module.

13. The impedance detection device according to claim 12,

determining the measurement of the contact impedance from the processed measurement voltage comprises: determining an impedance value of the contact impedance from the processed measurement voltage, determining whether the determined impedance value exceeds a preset threshold, and regarding the impedance value and the determination result as the measurement result, and,

adjusting the energy delivered by the power module to the surgical electrode based on the measured voltage comprises: and if the judgment result shows that the impedance value exceeds the preset threshold value, cutting off or reducing the energy transmitted to the operation electrode by the power module.

14. The impedance detection device of claim 13, wherein the measurement module is further configured to issue a warning signal when the impedance value exceeds the preset threshold.

15. The impedance sensing device of claim 10, wherein determining the measurement of the contact impedance from the processed measurement voltage comprises: determining an impedance value of the contact impedance from the processed measurement voltage and taking the impedance value as the measurement result, and,

adjusting the energy delivered by the power module to the surgical electrode based on the measured voltage comprises: and judging whether the impedance value exceeds a preset threshold value, and if so, cutting off or reducing the energy transmitted to the operation electrode by the power module.

16. The impedance detection device of claim 12, wherein the signal processing module comprises:

the amplifying circuit is used for amplifying the measuring voltage; and

and the analog-to-digital conversion circuit is used for performing analog-to-digital conversion on the amplified measurement voltage to obtain the processed measurement voltage.

17. The impedance detection device of claim 12, wherein the parallel resonant circuit, the excitation signal source, the signal processing module, the measurement module, and the isolated transmission module are integrated on a same circuit board.

18. The impedance detection device of claim 10, further comprising:

a signal processing module coupled to the parallel resonant circuit for processing the measurement voltage;

an isolation transmission module coupled between the signal processing module and the control module and configured to electrically isolate the signal processing module from the control module and transmit the processed measurement voltage to the control module, and,

adjusting the energy delivered by the power module to the surgical electrode based on the measured voltage comprises: and determining the impedance value of the contact impedance according to the processed measured voltage, judging whether the impedance value exceeds a preset threshold value, and cutting off or reducing the energy transmitted to the surgical electrode by the power module if the impedance value exceeds the preset threshold value.

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