Impedance-adaptive plasma surgery system

Abstract

The present application relates to the field of plasma surgery, and an embodiment thereof discloses an impedance-adaptive plasma surgery system, comprising: a plasma knife head component for applying generated plasma to a target; the surgery system further comprises: a feedback component for generating a feedback quantity based on the working condition of the plasma knife head component; and an energy control component configured to determine the energy output to the plasma knife head component based on the feedback quantity. The embodiment of the present application can adjust the emission power in time according to the working condition of the knife head component, and maintain the continuous excitation of the plasma.

Description

Technical Field

[0001] The present invention relates to the field of plasma surgery, and in particular to an impedance-adaptive plasma surgery system. Background Art

[0002] The low-temperature plasma surgical system is a new generation of electrosurgical surgical system that can be used for soft tissue dissection, resection, hemostasis and desiccation in surgical operations. It can be used in conjunction with an endoscope system for intracavitary surgery or with an imaging system for interventional treatment. It eliminates the damage and harm of radiofrequency to doctors and patients and improves the efficiency of surgery. It also has various electrodes with different outer diameters, different curvatures and different lengths suitable for different departments.

[0003] When using a plasma surgical system for surgery, the energy of the plasma surgical system needs to be controlled within a certain range. The instantaneous energy output by the existing plasma surgical system is weak, making it difficult to excite plasma and generate plasma continuously, which can lead to problems such as the knife sticking, the knife not cutting sharply, and low cutting efficiency. Summary of the Invention

[0004] In order to overcome or at least partially overcome the above technical problems, the present invention provides an impedance-adaptive plasma surgery system.

[0005] To achieve the above objectives, the present invention provides, on one hand, an impedance-adaptive plasma surgical system, comprising: a plasma blade head component for applying generated plasma to a target; a feedback component for generating a feedback amount based on the operating condition of the plasma blade head component; and an energy control component configured to determine the energy output to the plasma blade head component based on the feedback amount.

[0006] Preferably, determining the energy output to the plasma cutter head component based on the feedback amount includes: determining that the energy control component is in one of a short circuit state, a protection state and a normal state based on the feedback amount; and determining the energy output to the plasma cutter head component based on the determined state.

[0007] Preferably, the conditions for determining the short-circuit state include: the impedance value corresponding to the feedback amount is less than or equal to the short-circuit impedance value; and the output energy of the short-circuit state is 0.

[0008] Preferably, the conditions for determining the protection state include: determining that the impedance value corresponding to the feedback amount is greater than the short-circuit impedance value, and the impedance value corresponding to the feedback amount is less than the excitation impedance value; and the output energy of the protection state is an energy safety value.

[0009] Preferably, the conditions for determining the normal state include: determining that the impedance value corresponding to the feedback amount is greater than the excitation impedance value; the output energy of the normal state is: determining the corresponding peak power and power curve based on the type of the plasma blade head component; determining the power output to the plasma blade head component according to the peak power, the power curve, and the impedance value corresponding to the feedback amount.

[0010] Preferably, determining the power output to the plasma cutter head component includes: determining a duty cycle of a control signal, the duty cycle including an on-time and an off-time; the control signal is used to control the on and off of the DC power supply to the plasma cutter head component.

[0011] Preferably, when the peak power remains unchanged, the control signal keeps the off time unchanged and only changes the on time.

[0012] Preferably, the feedback component includes one or a combination of the following: a current transformer, a sampling resistor and a parallel sampling unit.

[0013] Preferably, the energy control component includes several energy control sub-components, and the energy control sub-components respectively perform energy output control in the short-circuit state, protection state and normal state.

[0014] Preferably, the energy control subcomponent includes a single chip microcomputer or a comparator.

[0015] Through the above technical solution, the output power can be automatically controlled according to the impedance of the blade head component, thereby enhancing the surgical effect and solving the problem of difficult excitation of plasma energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a connection diagram of an impedance adaptive plasma surgery system according to an embodiment of the present invention;

[0017] Figure 2 is a flow chart of an impedance adaptive plasma surgery system according to an embodiment of the present invention;

[0018] Figure 3 2 is a schematic structural diagram of a short-circuit detection circuit according to an embodiment of the present invention. DETAILED DESCRIPTION

[0019] The following describes the specific embodiments of the present invention in detail with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present invention and are not intended to limit the present invention.

[0020] Figure 1Schematic diagram of the connection of the impedance adaptive plasma surgery system according to an embodiment of the present invention. The method can be used in the energy control device of the plasma surgery system, such as Figure 1 As shown, an impedance-adaptive plasma surgical system includes a plasma blade component for applying generated plasma to a target; the surgical system also includes a feedback component for generating feedback based on the operating conditions of the plasma blade component. Energy from the plasma surgical system is applied to human tissue via the plasma blade component. The operating conditions of the blade component refer to the working environment of the blade component, including saline concentration, tissue impedance, and contact area. The impedance and current of the target acted upon by the blade component are inversely correlated. Lower impedance results in higher input current and higher output power. Conversely, higher impedance results in lower input current and lower output power. Therefore, current sampling can be used to obtain a sampled current related to the current output current. This sampled current serves as the feedback quantity. In some scenarios, the feedback quantity can be a voltage, sampled using a voltage divider resistor.

[0021] The energy control component is configured to determine the energy output to the plasma cutting head component based on the feedback. The output energy of the surgical system determines the operating state of the energy supply module within the system and the effectiveness of the cutting head component. By determining the energy output to the plasma cutting head component, this embodiment not only enables the energy supply module within the system to operate within an appropriate range, but also protects the surgical system from abnormal conditions while ensuring the effectiveness of the cutting head component.

[0022] Through this embodiment, the output energy of the surgical system can be controlled to meet the changes in external working conditions in a timely manner, thereby ensuring the continuous working ability of the surgical system and improving the reliability of the work.

[0023] Figure 2 FIG. 1 is a flow chart of an impedance adaptive plasma surgery system according to an embodiment of the present invention. Figure 2 As shown. In this embodiment, determining the energy output to the plasma cutting head component based on the feedback amount includes: determining, based on the feedback amount, whether the energy control component is in one of a short-circuit state, a protection state, and a normal state; and determining the energy output to the plasma cutting head component based on the determined state. These three states encompass common operating conditions of surgical systems. By determining the acquired feedback amount and based on the control circuitry or control logic within the surgical system, the output energy is controlled. Each of these operating conditions is described below.

[0024] In one embodiment, the conditions for determining a short-circuit state include: the impedance value corresponding to the feedback amount is less than or equal to the short-circuit impedance value; and the output energy in the short-circuit state is zero. This feedback amount can be implemented through circuitry, for example: a parallel short-circuit detection circuit samples the output voltage, generates a short-circuit detection signal based on the voltage sampling result, and then transmits this short-circuit detection signal to a single-chip microcomputer. The single-chip microcomputer controls the opening or closing of a switch module connected to the energy supply end based on the short-circuit detection signal. When the switch module is open, the output energy of the energy supply module is reduced to zero, and thus the output energy of the blade component is also reduced to zero, thereby achieving short-circuit protection and improving the safety of the surgical system. Figure 3 : is a schematic diagram of the short circuit detection circuit structure according to an embodiment of the present invention. Figure 3 As shown, the other end of the tenth resistor R10 and the other end of the eleventh resistor R11 are respectively connected to the plasma energy output module as the two ends of the input end of the parallel short-circuit detection circuit, and the output end of the first comparator A1 is connected to the single-chip microcomputer as the output end of the parallel short-circuit detection circuit.

[0025] In one embodiment, the conditions for determining the protection state include: determining that the impedance value corresponding to the feedback amount is greater than the short-circuit impedance value, and the impedance value corresponding to the feedback amount is less than the excitation impedance value; and the output energy of the protection state is an energy safety value. Plasma requires a suitable excitation impedance and a corresponding excitation voltage to be excited. In normal working conditions, the excitation voltage generally meets the requirements, but the impedance value varies with the working conditions of the cutter head component. When the impedance value corresponding to the obtained feedback amount is less than the excitation impedance value, the output power corresponding to the working current will increase. At this time, output energy protection is required to limit the output energy to within the energy safety value to ensure continuous excitation of the plasma.

[0026] In one embodiment, the conditions for determining the normal state include: determining that the impedance value corresponding to the feedback amount is greater than the excitation impedance value; and the output energy in the normal state is: determining the corresponding peak power and power curve based on the type of the plasma blade component; and determining the power output to the plasma blade component based on the peak power, the power curve, and the impedance value corresponding to the feedback amount. Except for the aforementioned two states, the surgical system mostly operates in the normal state. In this embodiment, the output voltage of the DC power supply control module in the surgical system has different gears, such as 10 gears, each corresponding to a different voltage. For example, the highest gear, the 10th gear, corresponds to 65V, with the remaining gears decreasing in order. The output end of the plasma energy output module serves as the output end of the plasma energy control system. The plasma energy control system includes an external interface for connecting the surgical blade and the foot switch. The output end of the plasma energy output module can be connected to different models of surgical blades through the external interface of the control panel. Different models of surgical blades connected to the output end of the plasma energy control system require different energy. Accordingly, the power output of the plasma energy control system must meet different peak power and power curves. The peak power and power curve corresponding to different surgical blade models can be set by the operator according to actual needs. For example, when using blade A, the peak power is set to 300W. The plasma energy control system's output power must meet Power Curve A. The peak power control circuit acquires the sampled current in real time, amplifies it, and generates a voltage signal that is sent to the microcontroller. This voltage signal essentially corresponds to the real-time impedance between the two poles of the blade. Based on the received voltage signal, the microcontroller calculates the corresponding duty cycle of the switch module when the peak power of 300W and Power Curve A are met, thereby generating a switch control signal to open or close the switch module. Different voltage signals correspond to different preset peak powers and preset power curves.

[0027] In one embodiment, determining the power output to the plasma blade component includes determining a duty cycle of a control signal, the duty cycle comprising an on-time and an off-time; the control signal being used to control the on and off of the DC power supply to the plasma blade component. Specifically, for the same blade model, for example, assuming a preset peak power point of 200 ohms, when the measured impedance is less than 200 ohms, the duty cycle of the microcontroller-controlled switch module is approximately 500 ms, including an off-time of approximately 110 ms. When the measured impedance is 50 ohms, to accommodate the preset power curve, the duty cycle of the microcontroller-controlled switch module is approximately 140 ms, including an off-time of approximately 110 ms, thereby ensuring that the output power of the plasma energy control system is consistently controlled within a desired range.

[0028] And further, when the peak power remains unchanged, the control signal keeps the disconnection time unchanged and only changes the connection time. Compared with the prior art, the working cycle in this embodiment consists of the disconnection time and the working time, and when the preset peak power remains unchanged, that is, the gear is not changed, the disconnection time remains unchanged. When the measured impedance is lower than the excitation impedance value of the plasma, only the length of its working time is adjusted to shorten its working time, while keeping the disconnection time unchanged, thereby shortening the working cycle. During the disconnection time, the switching circuit is charged and stored with energy through the DC power supply control module. The embodiment provided by the present invention can adjust the working cycle of the switching module according to the preset peak power and the preset power curve. Since the switching circuit is disconnected and stores energy when the impedance is lower than the excitation impedance value of the plasma, the working cycle is short within a certain range, the instantaneous power becomes large, and the burst energy is very strong, which can effectively avoid problems such as weak instantaneous energy excitation and not easy to generate plasma. During surgery using the surgical system in this embodiment, when tissue adheres to the surgical blade, i.e., blade sticking occurs, the blade impedance changes. If the blade sticking problem is not solved, the surgical effect will be seriously affected. In this embodiment, since the switching circuit disconnects the energy storage, the instantaneous energy excitation time is short, and the plasma generated by the instantaneous energy can be used to remove the tissue attached to the blade, quickly solving the blade sticking problem. In addition, since this embodiment can continuously output plasma energy, it has the advantages of fast cutting and high efficiency.

[0029] In one embodiment, the feedback component includes one or a combination of the following: a current transformer, a sampling resistor, and a parallel sampling unit. The operating voltage and current of the surgical system reflect the operating conditions of the cutting head component, and the feedback generated by the operating feedback component reflects the operating voltage and current. Current transformers, sampling resistors, and parallel sampling units have different advantages and application scenarios. By selecting electrical components such as current transformers, sampling resistors, and parallel sampling units, relatively accurate feedback can be obtained.

[0030] In one embodiment, the energy control component includes several energy control subcomponents, and the energy control subcomponents respectively perform the energy output control in the short circuit state, protection state and normal state. The aforementioned energy output control can be performed by one control component or by multiple control components. For example, a control logic component or a control circuit can be used, and both have their advantages. Implementing the energy output control in the short circuit state in a circuit manner has the advantage of fast response speed, and can be used Figure 3 The protection state and normal state can be controlled by a single chip microcomputer to implement more complex logic control.

[0031] In one embodiment, the energy control subcomponent includes a single-chip microcomputer or a comparator. The control logic requires comparing the resistance corresponding to the feedback value with a preset short-circuit impedance value or excitation impedance value. As previously mentioned, this can be implemented using a controller or a control circuit. The core of the controller implementation lies in the single-chip microcomputer, which can set preset logic according to user needs and perform judgment functions. The core of the control circuit implementation lies in the comparator, which can compare two electrical parameters and output the results, offering the advantage of fast response.

[0032] The technical solution in this embodiment can control the energy output based on the real-time working conditions of the cutter head components, maintain the stability of plasma excitation, and effectively improve cutting efficiency.

[0033] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited thereto. Within the technical concept of the present invention, the technical solution of the present invention may be subjected to various simple modifications, including combining the specific technical features in any suitable manner. To avoid unnecessary repetition, the present invention will not further describe various possible combinations. However, these simple modifications and combinations should also be regarded as disclosed in the present invention and fall within the scope of protection of the present invention.

Claims

1. An impedance-adaptive plasma surgical system, comprising: The plasma cutting head component is used to apply the generated plasma to the target; wherein the surgical system further comprises: A feedback component, configured to generate a feedback value based on the working condition of the plasma cutter head component; An energy control component is configured to determine the energy output to the plasma cutter head component based on the feedback amount, including: determining that the energy control component is in one of a short circuit state, a protection state, and a normal state based on the feedback amount; and determining the energy output to the plasma cutter head component based on the determined state; The conditions for determining the normal state include: determining that the impedance value corresponding to the feedback amount is greater than the excitation impedance value; the output energy of the normal state is: Determining corresponding peak power and power curve based on the type of the plasma cutter head component; The power output to the plasma blade head component is determined based on the peak power, the power curve, and the impedance value corresponding to the feedback amount; the conditions for determining the short-circuit state include: the impedance value corresponding to the feedback amount is less than or equal to the short-circuit impedance value; the output energy of the short-circuit state is 0; the conditions for determining the protection state include: determining that the impedance value corresponding to the feedback amount is greater than the short-circuit impedance value, and the impedance value corresponding to the feedback amount is less than the excitation impedance value; the output energy of the protection state is an energy safety value.

2. The impedance adaptive plasma surgery system according to claim 1, characterized in that: The determining of the power output to the plasma cutter head component comprises: determining a duty cycle of the control signal, the duty cycle comprising an on-time and an off-time; The control signal is used to control the connection and disconnection of the DC power supply to the plasma cutter head component.

3. The impedance adaptive plasma surgery system according to claim 2, characterized in that: When the peak power remains unchanged, the control signal keeps the off time unchanged and only changes the on time.

4. The impedance adaptive plasma surgery system according to claim 1, characterized in that: The feedback component includes one or a combination of the following: Current transformer, sampling resistor and parallel sampling unit.

5. The impedance adaptive plasma surgery system according to claim 1, characterized in that: The energy control component includes several energy control subcomponents, and the energy control subcomponents respectively perform energy output control in the short circuit state, protection state and normal state.

6. The impedance adaptive plasma surgery system according to claim 5, characterized in that: The energy control subcomponent includes a single chip microcomputer or a comparator.

Images