Electromagnetic scalpel surgical power control system and method

Abstract

The application relates to the technical field of biomedical engineering, in particular to a power control system and method for an electromagnetic knife operation, which comprises a control module, an amplifier, a directional coupler and an electromagnetic knife connected in sequence, and the control module is further connected with the directional coupler through a power meter; the amplifier is used for generating electromagnetic energy according to a control signal of the control module and supplying the electromagnetic energy to the electromagnetic knife through the directional coupler; the directional coupler is used for detecting forward power and reverse power through impedance on a matching line and sending the forward power and the reverse power to the control module through the power meter; and the control module is used for adjusting the forward power according to the forward power and the reverse power and using a preset algorithm to automatically control power output of the electromagnetic knife through the directional coupler. It can be understood that the power output is automatically controlled by detecting the change of the power in the system and feeding back in real time, so that the treatment effect on the patient by the doctor is guaranteed.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of biomedical engineering, and particularly relates to a power control system and method for an electromagnetic knife. BACKGROUND

[0002] In recent years, the intelligentization of medical equipment has attracted widespread attention, and the speed of development and innovation and the process of construction and promotion have significantly accelerated, gradually providing doctors with more advanced medical instruments and better serving patients.

[0003] Traditional surgical equipment has certain safety problems in neurosurgery or some tumor minimally invasive treatment processes, and can easily cause damage to the brain and other organs or some fine and complex nerves. A surgical system with an electromagnetic knife as the main tool emerges as the times require. In the case of minimally invasive, the electromagnetic knife can achieve very fine surgical treatment, even into parts of the human body that are difficult to access. The traditional surgery greatly depends on the experience of doctors and the naked eye judgment. With the assistance of the electromagnetic knife surgical system, doctors have stronger real-time perception ability, to a certain extent, reduce the risk of surgery and reduce the difficulty of surgery, provide great convenience for doctors, and make minimally invasive, complex and fine surgery more safe and controllable.

[0004] However, the existing electromagnetic knife system is mostly manually controlled by doctors, which can easily cause the tissue to change dramatically due to heat, not only causing the tissue and the knife head to adhere, but also generating steam and smoke that can affect the doctor's vision. The uneven heat can not significantly affect the coagulation effect, and the temperature that is not well controlled can cause damage to the human organs to a certain extent. SUMMARY

[0005] Therefore, the purpose of the present application is to provide a power control system and method for an electromagnetic knife, to solve the problem that the existing electromagnetic knife system needs to be manually controlled to output power, which affects the treatment effect.

[0006] According to a first aspect of the embodiment of the present application, a power control system for an electromagnetic knife is provided, comprising:

[0007] a control module, an amplifier, a directional coupler and an electromagnetic knife connected in sequence, the control module is further connected with the directional coupler through a power meter;

[0008] The amplifier is used to generate electromagnetic energy according to the control signal of the control module, and supply the electromagnetic energy to the electromagnetic knife through the directional coupler;

[0009] The directional coupler is used to detect the forward power and the reverse power through the impedance on the matching line, and send the forward power and the reverse power to the control module through the power meter;

[0010] The control module is configured to adjust the forward power by using a preset algorithm according to the forward power and the reverse power, so as to automatically control the power output of the electromagnetic knife through the directional coupler.

[0011] Preferably, the system further comprises:

[0012] a display and an operation module connected to the control module respectively;

[0013] the display and the operation module are connected to each other;

[0014] the display is configured to display data information;

[0015] the operation module is configured to control the power output of the electromagnetic knife through the control module according to an operation instruction.

[0016] Preferably, the system further comprises:

[0017] a vital sign monitoring module configured to monitor the vital signs of a patient in real time and send an abnormality prompt when the vital signs are abnormal.

[0018] Preferably, the electromagnetic knife is provided with a shielding shell.

[0019] The shielding shell is made of nanocrystals as a shielding material.

[0020] Preferably, a preset volume of heat storage phase change material is embedded in the head of the electromagnetic knife to control the constant temperature of the head.

[0021] According to a second aspect of the embodiment of the present application, an electromagnetic knife surgery power control method is provided, which is applied to the system as described above and comprises:

[0022] When the electromagnetic knife is in a working state, the forward power and the reverse power are detected by matching the impedance on the matching line.

[0023] According to the forward power and the reverse power, the forward power is adjusted by using a preset algorithm, so as to automatically control the power output of the electromagnetic knife through the directional coupler.

[0024] Preferably, the method further comprises:

[0025] monitoring the vital signs of a patient in real time;

[0026] When the vital signs are abnormal and a manual control instruction is received, the power output of the electromagnetic knife is controlled according to the manual control instruction.

[0027] The technical scheme provided by the embodiment of the present application can have the following beneficial effects:

[0028] It can be understood that the present application controls the power output of the electromagnetic knife through the control module, the amplifier, the directional coupler and the electromagnetic knife connected in sequence, the control module is further connected with the directional coupler through the power meter; the amplifier is used to generate electromagnetic energy according to the control signal of the control module, and supply the electromagnetic energy to the electromagnetic knife through the directional coupler; the directional coupler is used to detect the forward power and the reverse power through the impedance on the matching line, and send the forward power and the reverse power to the control module through the power meter; the control module is used to adjust the forward power according to the forward power and the reverse power, and automatically control the power output of the electromagnetic knife through the directional coupler by using a preset algorithm. It can be understood that the power output is automatically controlled by detecting the change of the power in the system and feeding back in real time, the treatment effect of the doctor on the patient is guaranteed, at the same time, the heat generated by the medium in the operation process is stably changed and controllable, which greatly reduces the operation risk of such operation, and helps to promote the further popularization of intelligent medical treatment.

[0029] It should be understood that the foregoing general description and the following detailed description are only exemplary and explanatory, and cannot limit the present application. BRIEF DESCRIPTION OF DRAWINGS

[0030] The accompanying drawings, which are incorporated into and form part of the specification, illustrate an embodiment consistent with the present application and, together with the specification, serve to explain the principles of the present application.

[0031] Figure 1 is a schematic block diagram of an electromagnetic knife operation power control system according to an exemplary embodiment;

[0032] Figure 2 is a schematic diagram of a knife head when the electromagnetic knife is cutting according to an exemplary embodiment;

[0033] Figure 3 is a schematic diagram of a knife head when the electromagnetic knife is coagulating according to an exemplary embodiment;

[0034] Figure 4 is a schematic diagram of an electromagnetic surgical knife with a shielding material shell according to an exemplary embodiment;

[0035] Figure 5 is a model of the electromagnetic knife filled with heat storage phase change material according to an exemplary embodiment;

[0036] Figure 6 is a simulation model of the working state of a composite electromagnetic knife according to an exemplary embodiment;

[0037] Figure 7 is a schematic block diagram of an electromagnetic knife operation power control method according to an exemplary embodiment;

[0038] Figure 8is a flow chart of a method for controlling the power of an electrosurgical knife according to an exemplary embodiment. DETAILED DESCRIPTION

[0039] The exemplary embodiments will be described in detail herein with reference to the attached drawings. The description of the exemplary embodiments is intended to apply to various alternative embodiments as well. The following description is not limited to the exemplary embodiments, but rather, is applicable to any apparatus and methods in accordance with the present application, as described in the claims.

[0040] Embodiment One

[0041] Figure 1 is a schematic block diagram of a system for controlling the power of an electrosurgical knife according to an exemplary embodiment, referring to Figure 1 A system for controlling the power of an electrosurgical knife is provided, comprising:

[0042] a control module 200, an amplifier 100, a directional coupler 300 and an electrosurgical knife 500 connected in sequence, the control module 200 further connected to the directional coupler 300 through a power meter 400;

[0043] The amplifier 100 is configured to generate electromagnetic energy according to the control signal from the control module 200, and supply the electromagnetic energy to the electrosurgical knife through the directional coupler 300;

[0044] The directional coupler 300 is configured to detect the forward power and the reverse power through the impedance on the matching line, and send the forward power and the reverse power to the control module 200 through the power meter 400;

[0045] The control module 200 is configured to adjust the forward power according to the forward power and the reverse power, and automatically control the power output of the electrosurgical knife through the directional coupler by using a preset algorithm.

[0046] The electromagnetic knife master control machine 000 is composed of the control module 200, the amplifier 100, the directional coupler 300, the power meter 400 and the display and button 600.

[0047] In specific practice, the components of the whole system include: an electromagnetic knife head with the functions of clamping, cutting tissue, transmitting electromagnetic energy to achieve coagulation; a directional coupler for detecting forward and reverse power by matching the impedance on the line; a power meter for receiving forward and reverse power; the chip in the circuit of the amplifier uses MRF101AN; the control module uses a main control chip MCU, which carries a complete set of process algorithms, and the distribution of power in the system can be automatically adjusted through the detection of the change of forward power by the power meter, so as to realize the cooling and coagulation function of the knife head.

[0048] In actual application scenarios, when the knife head of the electromagnetic knife is not clamping tissue, there is no load in the circuit, which presents an open circuit state, and the power consumed at the medium is zero.

[0049] When the knife head of the electromagnetic knife clamps human tissue or blood vessels, a load is added to the circuit, and the generated power consumption at the medium makes the reverse power through the directional coupler smaller. At this time, the thermal power at the medium becomes larger, the directional coupler obtains the change of forward and reverse power through the impedance in the matching circuit, and transmits the data to the power meter. The power meter transmits the data to the main control chip of the control module, and under the operation of the algorithm in the main control chip, the forward power P F is reduced, the wave propagation direction in the circuit is changed, the reverse transportation of power is realized through the directional coupler, reaches the medium, and rapidly reduces the temperature of the medium to control the thermal stability.

[0050] It should be noted that the system further comprises:

[0051] a display and an operation module connected to the control module respectively;

[0052] the display and the operation module are connected to each other;

[0053] the display is used for displaying data information;

[0054] the operation module is used for controlling the power output of the electromagnetic knife through the control module according to the operation instruction.

[0055] In actual application scenarios, when the electromagnetic knife is loosened from the tissue again, the power consumption at the medium becomes smaller, so that the reverse power through the directional coupler becomes larger. At this time, the doctor can actively increase the forward power through the foot pedal according to the change of the power data or the temperature change on the display screen, heat the tissue again and perform cutting operation.

[0056] It can be understood that the application controls the modules in sequence, that is, the control module, the amplifier, the directional coupler and the electromagnetic knife, the control module is further connected with the directional coupler through the power meter; the amplifier is used to generate electromagnetic energy according to the control signal of the control module, and supply the electromagnetic energy to the electromagnetic knife through the directional coupler; the directional coupler is used to detect the forward power and the reverse power through the impedance on the matching line, and send the forward power and the reverse power to the control module through the power meter; the control module is used to adjust the forward power according to the forward power and the reverse power, and automatically control the power output of the electromagnetic knife through the directional coupler by using a preset algorithm. It can be understood that the power output is automatically controlled by detecting the change of the power in the system and feeding back in real time, the treatment effect of the doctor on the patient is guaranteed, at the same time, the heat generated by the medium in the surgical process is stably changed and controllable, which greatly reduces the operation risk of such surgery, and helps to promote the further popularization of intelligent medical treatment.

[0057] It should be noted that the system further comprises:

[0058] The vital sign monitoring module is used to monitor the vital signs of the patient in real time, and issue an abnormal prompt when the vital signs are abnormal.

[0059] In specific practice, the doctor can judge the critical situation by detecting the vital signs of the patient, actively reduce the forward power by the foot pedal, clamp the blood vessel and quickly make blood coagulation treatment, and cool the tissue.

[0060] The technical scheme of the embodiment realizes the function of "automatic + manual" double control by detecting the change of the power in the system and feeding back in real time, to guarantee that the heat generated by the medium in the surgical process is stably changed and controllable at any time, which greatly promotes the innovation and development process of intelligent medical equipment. At the same time, the advantages of the doctor controlling the operation process according to experience in traditional surgery are retained, and the risk problems are reacted in time.

[0061] Preferably, the forward power, the reverse power, the power consumed by the medium and the heat power satisfy a certain corresponding relationship based on the change of the power in the system.

[0062] The corresponding relationship is shown in the following relational expression:

[0063] P F = P R + P Ra + P T

[0064] Wherein, P F represents the forward power, P R represents the reverse power, P Ra represents the space radiation power, and P T represents the heat power.

[0065] When the clamp jaw or the knife head does not clamp the tissue, the circuit presents an open circuit state, no load, and the power consumed by the medium is zero;

[0066] When the clamp jaw or the knife head clamps the human tissue or blood vessel, a load is added to the circuit, the power generated by the medium consumption becomes smaller, the reverse power passing through the directional coupler becomes smaller, at this time, the thermal power at the medium becomes larger, the power meter transmits data to the main control chip MCU of the control module, under the operation of the algorithm, through the feedback mechanism of the system circuit, the forward power P F , so as to rapidly reduce the temperature at the medium and control the thermal stability change;

[0067] When the clamp jaw or the knife head releases the tissue again, the power generated by the medium consumption in the circuit becomes smaller, the reverse power passing through the directional coupler becomes larger, at this time, the doctor end can manually adjust the forward power to become larger, heat the tissue again and perform the cutting operation.

[0068] It should be noted that the electromagnetic knife has a shielding shell;

[0069] The shielding shell uses nanocrystals as a shielding material.

[0070] It should be noted that the knife head of the electromagnetic knife is embedded with a preset volume of heat storage phase change material 502 to control the constant temperature of the knife head.

[0071] Embedding the preset volume of heat storage phase change material in the knife head of the electromagnetic knife can realize the temperature stability of the electromagnetic knife.

[0072] In specific practice, preferably, as shown in Figure 2 Based on the No. 11 knife head widely used in the field of medical surgical operations, structural improvements suitable for electromagnetic signal transmission are made to adapt to the needs of tissue cutting in precise operations.

[0073] As shown in Figure 3 When the electromagnetic knife performs coagulation operation, it can quickly clamp the blood vessel according to the power in the circuit, and also has the characteristics of rapid cooling to prevent adhesion to the tissue and zero smoke.

[0074] As shown in Figure 4 The outside of the surgical knife shell is made of graphene material, and the inside is attached with nanocrystal material for electromagnetic shielding. Nanocrystals are widely used shielding materials that can shield both electricity and magnetic radiation. In the design of the electromagnetic knife, electromagnetic radiation is absorbed by the shielding shell and controlled within the shell. Under the action of the shielding shell, the thermal power 1645W of the knife head can be controlled to be below 4W, which is less than the electromagnetic power safety value, and the electromagnetic safety area is reduced to the range of 80mmx80mmx80mm to ensure the safety of the patient and the doctor.

[0075] In order to facilitate the understanding of the technical solutions of the present application, the technical solutions of the present application will be described below in combination with specific data in an embodiment.

[0076] In this embodiment, the coaxial cable is used for feeding. Figure 1 The electromagnetic emitter 501 in the electromagnetic knife is made of martensitic stainless steel, which has a relative magnetic permeability of several thousand and a very small heat loss, but a very high electromagnetic emission energy, and is very suitable for use as an electromagnetic emitter of an electromagnetic surgical knife head. The knife body shell 503 is made of PTFE (relative dielectric constant 2.032, loss tangent 0.003), forming an isolated local area to protect human tissues. The internal area of the knife body shell 503 of the electromagnetic knife is filled with a heat storage phase change material 502, which can help maintain the constant temperature of the knife body. The electromagnetic knife is provided with an electromagnetic shielding layer made of nanocrystalline material (relative magnetic permeability greater than 20,000), which can shield the electromagnetic energy radiated by the electromagnetic knife. The shielding effectiveness of the shielding layer is tested on this basis, and the example results show that the design can control the specific absorption rate of electromagnetic radiation dose to be less than 4 W / kg, and the electromagnetic radiation range to be within 80 mm x 80 mm x 80 mm, which meets the electromagnetic safety regulations and can ensure the safety of the human body during the use of the surgical system.

[0077] In order to simulate the electromagnetic radiation law of the electromagnetic knife in actual surgical operation, five situations of opening and closing of the knife head in the technical solutions of the present application are simulated in another embodiment.

[0078] In this embodiment, the knife head is made of martensitic stainless steel, and the overall structure is referred to the proportional size of a mosquito hemostat. In a specific case, the main body of the simulation model is formed by two cones at a certain angle and connected by a patch, as shown in Figure 5 The different degrees of contact between the knife head and human tissues in actual surgery are divided into four situations to simulate.

[0079] Case one: the knife head is in a closed state, i.e. the non-working state, at this time the circuit is open. The simulation result S11 graph has almost no energy absorption, and the simulation result conforms to the overall design idea.

[0080] Case two: the knife head is in an open state and does not clamp the tissue, at this time the circuit is also open. The simulation result S11 graph has almost no energy absorption, and the simulation result conforms to the overall design idea.

[0081] Case three: the knife head clamps the human tissue, and is in working state. At this time, there is a load in the circuit. In this case, the condition that the energy generated by the electromagnetic knife heating is absorbed by the tissue is simulated by simulating the condition that the knife head is tangent to the 30mm human blood vessel, so as to determine the electromagnetic radiation efficiency. At this time, according to the design needs, the power conditions of the knife head in different angles clamping different diameter blood vessels are simulated respectively. According to the simulation S11 diagram, it is concluded that when clamping thicker blood vessels or tissues, the electromagnetic knife power control efficiency is higher; when clamping tissues closer to the opening of the knife head, the electromagnetic knife working efficiency is higher. Therefore, it can be concluded that even if complex surgical operations are performed, the electromagnetic knife can still ensure rapid heating of the tissue within a certain time. Further, considering that the biggest problem in the actual work of the electromagnetic knife is that the overheating of the knife head may cause potential safety hazards in the operation, such as tissue adhesion, excessive smoke, etc. In order to solve this key problem, the embodiment proposes to embed a certain volume of heat storage phase change material in the martensitic stainless steel knife head to control the constant temperature of the knife head. The heat storage phase change material, such as CrodaTherm 74, is a water-insoluble organic high-temperature phase change material, which is derived from plant-based raw materials, and its form presents as crystalline wax or oil-like liquid at different temperatures, which is also the key to its constant temperature regulation. By injecting a certain volume of heat storage phase change material into the knife head, it is easier to achieve a stable knife head temperature of about 60 degrees Celsius during the operation, and it is also easier to achieve the "double thread" control of the knife head temperature rapid rise and constant temperature. When the temperature is too high, not only can the power be adjusted to change the temperature through the feedback mechanism in the surgical system, but also the electromagnetic knife head at the operation end can quickly cool down through its own heat storage phase change material, to a certain extent, to avoid the problem of a large amount of smoke and tissue adhesion caused by the overheating of the knife head, and to play a protective role.

[0082] Therefore, in the embodiment, fresh water is used as the intracavity material for simulation, as shown in Figure 5 Compared with the solid martensitic stainless steel knife head structure, the radiation absorption efficiency of this case is significantly improved, and the embedding of the heat storage phase change material makes the efficiency of the electromagnetic knife in the tangential working state reach 47%, verifying the rationality and feasibility of the idea.

[0083] Case four: the knife head clamps the human tissue, and is in the coagulation operation working state. At this time, there is a load in the circuit. In this case, the condition that the energy generated by the electromagnetic knife heating is absorbed by the tissue is simulated by simulating the condition that the knife head clamps the 30mm human blood vessel, so as to determine the electromagnetic radiation efficiency. According to the actual case and theoretical knowledge, when the electromagnetic knife clamps the blood vessel, the blood vessel has a larger contact area with the knife head, and at this time it will absorb more heat. As the simulation result S11 diagram successfully verifies that when the electromagnetic knife clamps the blood vessel, more than 90% of the heat is absorbed by the tissue, and at this time the return loss is <-10dB.

[0084] In order to make the electromagnetic knife have higher working efficiency in work, preferably, a magnetic material plating layer is added to the inner side of the knife head. In the embodiment, the plating of nanocrystalline material on the inner side of the martensitic stainless steel is simulated. The nanocrystalline plating layer has the advantages of small loss, low temperature rise, high magnetic permeability, large power density, etc. The application of the nanocrystalline plating layer in the inner side of the electromagnetic surgical knife can solve the problem of knife head overheating and tissue adhesion. Most importantly, it is expected to improve the power control efficiency to some extent, which is beneficial to the heat dissipation of the knife head. Through analysis and comparison of a plurality of simulation data, it is found that there is no strong regularity between the magnetic permeability of nanocrystalline and the magnetic permeability of martensitic stainless steel, and the influence on the result is minimal.

[0085] In the actual operation process, there are still other safety hazards. The whole knife head is made of martensitic stainless steel, and the thermal properties are not very stable. As can be seen from the simulation results of the proposed embodiment, most of the electromagnetic energy is concentrated on the inner side of the knife head and the surrounding tissue. However, the heat on the outer side of the knife head should also be considered. When the knife head rapidly rises to 60 degrees Celsius, the outer side temperature is not easy to be controlled by power, and other tissues may be burned in actual operation. Therefore, a composite knife head is further proposed to improve the function of the electromagnetic knife operation system and more importantly to solve the safety hazards in the operation to the greatest extent. Figure 6 The composite knife head proposed by us is compared with Figure 5 The volume of the martensitic stainless steel is reduced, and only a 1mm thick steel plate is reserved. The outer side material of the knife head is set to PTFE. PTFE has the characteristics of high temperature resistance, anti-sticking, chemical corrosion resistance, wear resistance, etc. Its properties are stable and almost will not change due to the change of the temperature of the knife head. Using it outside the steel plate not only protects other human tissues from being burned, but also protects the complex structure inside the knife head from corrosion and wear, prolonging the service life of the knife head. More importantly, it protects other parts of the body from being damaged during the operation.

[0086] Therefore, the composite knife head is simulated in the embodiment. Compared with the knife head design of Figure 5 Although the structure of the composite knife head is more complex, the simulation results of S11 figure verify the effectiveness of this innovation point. The radiation absorption efficiency of this case is improved significantly, the return loss is <-13.9dB, and the electromagnetic radiation efficiency is close to 96%. In addition to the more stable properties, the efficiency of the composite knife head is also very high, which is very suitable for cutting and clamping human tissues in fine surgery. It can quickly rise in a short time, and there are double protections for the safety of other tissues of the human body. The cost is low, the properties are stable, and the wear resistance is good. The simulation results of a large number of embodiments verify the rationality and feasibility of the proposed composite electromagnetic knife.

[0087] Case five: when the electromagnetic knife head completes the coagulation operation on the tissue, the water content of the tissue is greatly reduced, at this time the heat of the electromagnetic knife may burn the tissue. In order to determine whether the electrical performance of the electromagnetic knife is still stable in this case and does not harm the tissue and other organs, we respectively simulate the situation that the knife head is clamped 30mm to continue the operation of the tissue with different diameters with reduced water content, to simulate the most dangerous state of the electromagnetic knife in operation, and to determine whether further protection measures are needed to improve the function of the electromagnetic knife by judging how much heat the tissue absorbs. In the actual case, the S11 of the small diameter tissue absorbing heat is -1.1859dB, and the S11 of the large diameter tissue is -2.1287dB. Compared with the small diameter tissue and the large diameter tissue before the water content is reduced, the S11 of the small diameter tissue under the coagulation operation is -13.8612dB and the S11 of the large diameter tissue under the coagulation operation is -20.2656dB. It can be concluded that even after the water content of the human tissue is reduced by an order of magnitude after the coagulation is completed, the heat radiation of the electromagnetic knife will not burn through the blood vessels or organs, and the safety is high.

[0088] Embodiment two

[0089] Figure 7 is a schematic block diagram of an electromagnetic knife surgical power control method according to an exemplary embodiment, see Figure 7 , provides an electromagnetic knife surgical power control method, applied to the system described in any one of the above, comprising:

[0090] Step S11, when the electromagnetic knife is in the working state, the forward power and the reverse power are detected by matching the impedance on the line;

[0091] Step S12, according to the forward power and the reverse power, using a preset algorithm, adjusting the forward power, to automatically control the power output of the electromagnetic knife through the directional coupler.

[0092] It can be understood that by detecting the change of power in the system and feeding back in real time, the power output is automatically controlled, the treatment effect of the doctor on the patient is guaranteed, at the same time the heat generated by the medium in the operation process is stable and controllable, which greatly reduces the operation risk of such operation, and helps to promote the further popularization of intelligent medical treatment.

[0093] It should be noted that the method further comprises:

[0094] Real-time monitoring of the patient's vital signs;

[0095] When the vital signs are abnormal, and a manual control instruction is received, the power output of the electromagnetic knife is controlled according to the manual control instruction.

[0096] In specific practice, see Figure 8When the electromagnetic knife head does not clamp the tissue after the operation starts, the circuit presents an open circuit state, no load, and the power consumed by the medium is zero.

[0097] When the electromagnetic knife head clamps the human tissue or blood vessel, a load is added to the circuit, the power generated by the medium consumption makes the reverse power through the directional coupler smaller, at this time the thermal power at the medium becomes larger, the system enters the process of alternating work of two modes, step S510 is the cutting mode, mainly for heating and cutting operation of the human tissue or tumor site, the directional coupler obtains the change of smaller reverse power through the impedance in the matching circuit, and transmits the change to the power meter, and the power meter transmits data to the main control chip of the control module. At this time, if the patient's vital signs are normal, the doctor continues to clamp and coagulate under the experience judgment, at this time step S520 is entered, that is, the system clamping mode, under the running of the algorithm in the main control chip, step S210 is entered, the forward power P F The wave propagation direction in the circuit is changed, the reverse transportation of power is realized through the directional coupler, reaches the medium, and rapidly reduces the temperature at the medium.

[0098] If the patient's vital signs are abnormal, the doctor wants to actively switch to the clamping mode to immediately reduce the temperature and coagulate, then the system protection mode is entered, step S220 is entered, the doctor can observe the change of power data or temperature change on the display screen, and actively reduces the forward power through the foot pedal, clamps the blood vessel to rapidly coagulate, cools the tissue, and achieves a protection effect.

[0099] Conversely, under the judgment of the doctor, if the operation continues, the forward power can still be actively increased through the foot pedal, the tissue is heated again and cut.

[0100] Based on the theoretical basis of the power control range in the system, the following heat calculation formula is obtained. The specific heat required for the knife head to heat up during the operation process is calculated as follows: the temperature of the human tissue is about 37 degrees Celsius, and the electromagnetic knife head needs to be raised by about 30 degrees Celsius for 1 second during the cutting operation. According to the heat calculation formula:

[0101] Q = c m ΔT

[0102] Wherein, Q is the heat, c is the specific heat capacity of different tissues, and ΔT is the required temperature rise. The required heat is about 126kJ. Therefore, the required power in the system during heating of the knife head is further calculated. The SAR value is usually used internationally to measure the thermal effect of terminal radiation, and the calculation formula of the electromagnetic heating specific absorption rate is as follows:

[0103]

[0104] Wherein, SAR is the specific absorption rate, the SAR value is generally used internationally to measure the thermal effect of terminal radiation, sigma is the conductivity, E(r) is the field strength induced by radiation energy, and p(r) is the function of the heat density. Referring to the values of the conductivity, relative permittivity, and density of the tissues of the human body, the electric field strength required by the electromagnetic knife head in 1 second and the power size during different types of operations can be calculated, and the power required in the system in which the knife head is raised by 30 degrees Celsius is higher than 1645V / m. In the process of detecting the power change, the thermal power in the system can be detected by referring to this index, so as to control the stable change of heat.

[0105] It can be understood that the same or similar parts in the above embodiments can be mutually referred to, and the contents not described in detail in some embodiments can be referred to the same or similar contents in other embodiments.

[0106] It should be noted that, in the description of the present application, the terms "first", "second", etc. are only for the purpose of description, and cannot be understood as indicating or implying relative importance. In addition, in the description of the present application, unless otherwise specified, the meaning of "a plurality of" is at least two.

[0107] Any process or method descriptions in flow charts or otherwise described herein represents an example of embodiments of the present application that can be embodied in code means that carry out the steps of the process, and the present application can include additional, fewer, or other steps performing the same or similar functions in some embodiments. Those skilled in the art will appreciate that at least some of the steps in any of the processes described herein can be carried out in a different order than the order shown or discussed, and that the processes described herein can be embodied in a computer program product that can be executed by a computer.

[0108] It should be understood that parts of the present application can be realized by hardware, software, firmware or a combination thereof. In the above embodiments, a plurality of steps or methods can be realized by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if realized by hardware, and as in another embodiment, it can be realized by any one or a combination of the following technologies known in the art: discrete logic circuit with logic gate circuit for implementing logic function on data signal, application specific integrated circuit with suitable combination logic gate circuit, programmable gate array (PGA), field programmable gate array (FPGA) and the like.

[0109] Those skilled in the art can understand that all or part of the steps carried out by the above-mentioned embodiment method can be completed by a program instructing the relevant hardware, and the program can be stored in a computer readable storage medium. When the program is executed, it includes one of the steps of the method embodiment or a combination thereof.

[0110] In addition, each function unit in each embodiment of the present application can be integrated in one processing module, or each unit can be physically present separately, or two or more units can be integrated in one module. The integrated module can be realized in the form of hardware, or in the form of a software function module. When the integrated module is realized in the form of a software function module and sold or used as an independent product, it can also be stored in a computer readable storage medium.

[0111] The storage medium mentioned above can be a read-only memory, a magnetic disk or an optical disk, etc.

[0112] In the description of the present specification, the description referring to the terms "one embodiment", "some embodiments", "an example", "a specific example" or "some examples" etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily mean the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0113] Although the embodiments of the present application have been shown and described above, it should be understood that the above embodiments are exemplary and should not be construed as limiting the present application, and those skilled in the art can make changes, modifications, replacements and variations to the above embodiments within the scope of the present application.

Claims

1. An electromagnetic scalpel surgical power control system, characterized by, Comprise: sequentially connected control module, amplifier, directional coupler and electromagnetic knife, the control module is also connected with the directional coupler through the power meter; The amplifier is used to generate electromagnetic energy according to the control signal of the control module, and supply the electromagnetic knife through the directional coupler; The directional coupler is used to detect forward power and reverse power through the impedance on the matching line, and send the forward power and reverse power to the control module through the power meter; The control module is used to adjust the forward power by using a preset algorithm according to the forward power and reverse power, so as to automatically control the power output of the electromagnetic knife through the directional coupler; The head of the electromagnetic knife is embedded with a preset volume of heat storage phase change material to control the constant temperature of the head.

2. The system of claim 1, wherein, Also include: a display and an operation module connected with the control module respectively; The display and the operation module are connected with each other; The display is used to display data information; The operation module is used to control the power output of the electromagnetic knife through the control module according to the operation instruction.

3. The system of claim 2, wherein, Also include: vital sign monitoring module, for real-time monitoring of patient's vital signs, when the vital signs appear abnormal, issue an abnormal prompt.

4. The system of claim 1, wherein: The electromagnetic knife has a shielding shell; The shielding shell uses nanocrystals as shielding material.

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