CN112155718A - Impedance adaptive plasma surgical system - Google Patents

Impedance adaptive plasma surgical system Download PDF

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Publication number
CN112155718A
CN112155718A CN202011148364.6A CN202011148364A CN112155718A CN 112155718 A CN112155718 A CN 112155718A CN 202011148364 A CN202011148364 A CN 202011148364A CN 112155718 A CN112155718 A CN 112155718A
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plasma
impedance
energy
surgical system
output
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CN202011148364.6A
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Inventor
李政
肖国庆
尹辉
唐宇豪
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Chengdu Shengshi Huitong Medical Technology Co ltd
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Chengdu Shengshi Huitong Medical Technology Co ltd
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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
    • A61B18/04—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by heating
    • A61B18/12—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by heating by passing a current through the tissue to be heated, e.g. high-frequency current
    • A61B18/1206—Generators therefor
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
    • A61B18/04—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by heating
    • A61B18/12—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by heating by passing a current through the tissue to be heated, e.g. high-frequency current
    • A61B18/14—Probes or electrodes therefor
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
    • A61B2018/00571—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body for achieving a particular surgical effect
    • A61B2018/00577—Ablation
    • A61B2018/00583—Coblation, i.e. ablation using a cold plasma
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
    • A61B2018/00571—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body for achieving a particular surgical effect
    • A61B2018/00601—Cutting
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
    • A61B2018/00636—Sensing and controlling the application of energy
    • A61B2018/00696—Controlled or regulated parameters
    • A61B2018/00702—Power or energy

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  • Health & Medical Sciences (AREA)
  • Surgery (AREA)
  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Biomedical Technology (AREA)
  • Otolaryngology (AREA)
  • Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
  • Plasma & Fusion (AREA)
  • Physics & Mathematics (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Medical Informatics (AREA)
  • Molecular Biology (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Surgical Instruments (AREA)

Abstract

The invention relates to the field of plasma surgery, and discloses an impedance self-adaptive plasma surgery system in an implementation mode, which comprises the following components: a plasma cutter head part for applying the generated plasma to a target; the surgical system further comprises: a feedback component configured to generate a feedback quantity based on a condition of the plasma cutter head component; an energy control component configured to determine an energy output to the plasma head component based on the feedback amount. The embodiment of the invention can adjust the emission power according to the working condition of the cutter head part in time and keep the continuous excitation of the plasma.

Description

Impedance adaptive plasma surgical system
Technical Field
The invention relates to the field of plasma surgery, in particular to an impedance self-adaptive plasma surgery system.
Background
The low-temperature plasma operation system is a new generation of electric surgical operation system, can be used for soft tissue dissection, excision, hemostasis and drying of surgical operation, can be matched with an endoscope system to carry out intracavity operation or matched with an image system to carry out interventional therapy and the like, eliminates the damage and harm of radio frequency to doctors and patients, improves the operation efficiency, and also has various electrodes with different outer diameters, different curvatures and different lengths which are suitable for different departments.
When the plasma surgical system is used 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 in excitation, plasma is not easy to excite, the plasma is not easy to continuously generate, and the problems of knife adhesion, no sharp cutting of a scalpel, low cutting efficiency and the like can occur.
Disclosure of Invention
To overcome or at least partially overcome the above technical problems, the present invention provides an impedance adaptive plasma surgical system.
To achieve the above object, an aspect of the present invention provides an impedance adaptive plasma surgical system, comprising: a plasma cutter head part for applying the generated plasma to a target; the surgical system further comprises: a feedback component configured to generate a feedback quantity based on a condition of the plasma cutter head component; an energy control component configured to determine an energy output to the plasma head component based on the feedback amount.
Preferably, said determining the energy output to said plasma head section based on said amount of feedback comprises: determining that the energy control part is in one of a short-circuit state, a protection state and a normal state based on the feedback quantity; determining an energy output to the plasma head section based on the determined state.
Preferably, the determination condition of the short circuit state includes: the impedance value corresponding to the feedback quantity is less than or equal to the short-circuit impedance value; the output energy of the short circuit state is 0.
Preferably, the determination condition of the protection state includes: determining that the impedance value corresponding to the feedback quantity is larger than the short-circuit impedance value and is smaller than the excitation impedance value; the output energy of the protection state is an energy safety value.
Preferably, the determination condition of the normal state includes: determining that the impedance value corresponding to the feedback quantity is larger than the excitation impedance value; the output energy in the normal state is as follows: determining a corresponding peak power and power curve based on the type of the plasma cutter head component; and determining the power output to the plasma cutter head part according to the peak power, the power curve and the impedance value corresponding to the feedback quantity.
Preferably, said determining the power output to said plasma head section comprises: determining a duty cycle of a control signal, the duty cycle comprising an on-time and an off-time; the control signal is used to control the turning on and off of the dc power to the plasma cutter head component.
Preferably, the control signal keeps the off-time constant and changes only the on-time when the peak power is constant.
Preferably, the feedback component comprises one or a combination of the following: the current transformer, the sampling resistor and the parallel sampling unit.
Preferably, the energy control component includes a number of energy control sub-components that respectively perform energy output control in the short circuit state, the protection state, and the normal state.
Preferably, the energy control subcomponent comprises a single chip or a comparator.
Through the technical scheme, the output power can be automatically controlled according to the impedance of the cutter head part, the operation effect is enhanced, and the problem that the plasma energy is not easy to excite is solved.
Drawings
FIG. 1 is a schematic diagram of the connection of an impedance-adaptive plasma surgical system according to an embodiment of the present invention;
FIG. 2 is a flow diagram of an impedance adaptive plasma surgical system according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a short-circuit detection circuit according to an embodiment of the invention.
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
Fig. 1 is a schematic connection diagram of an impedance-adaptive plasma surgical system according to an embodiment of the present invention, which can be used in a plasma surgical system energy control apparatus, as shown in fig. 1, and an impedance-adaptive plasma surgical system includes: a plasma cutter head part for applying the generated plasma to a target; the surgical system further comprises: a feedback component configured to generate a feedback quantity based on a condition of the plasma cutter head component; the energy of the plasma surgical system acts on human tissues through the plasma cutter head part, and the working condition of the cutter head part refers to the working environment of the cutter head part and comprises saline concentration, tissue impedance, contact area and the like. The resistance and current of the tool bit component acting target are in inverse correlation. The smaller the impedance, the larger the input current and the higher the output power. Conversely, the larger the impedance, the smaller the input current and the lower the output power. Therefore, a sampling current related to the current output current can be obtained by sampling the current, and the sampling current is the feedback quantity. In some scenarios, the feedback quantity may be a voltage, the sampling of which is achieved by a voltage divider resistor.
An energy control component configured to determine an energy output to the plasma head component based on the feedback amount. The output energy of the surgical system determines the working state of the energy supply module in the system and the action effect of the cutter head part. In the embodiment, the energy output to the plasma cutter head component is determined, so that the energy supply module in the system can work in a proper interval range, and the protection of the operation system in an abnormal state can be realized on the premise of ensuring the action effect of the cutter head component.
Through the embodiment, the output energy of the surgical system can be controlled to meet the change of external working conditions in time, the continuous working capacity of the surgical system is ensured, and the working reliability is improved.
Fig. 2 is a flow diagram of an impedance-adaptive plasma surgical system, as shown in fig. 2, in accordance with an embodiment of the present invention. In this embodiment, the determining the energy output to the plasma head section based on the feedback amount includes: determining that the energy control part is in one of a short-circuit state, a protection state and a normal state based on the feedback quantity; determining an energy output to the plasma head section based on the determined state. The three states comprise common working conditions of the surgical system, and the output energy is controlled by judging the acquired feedback quantity and based on a control circuit or control logic in the surgical system. The three operating conditions will be described separately below.
In one embodiment, the determination condition of the short circuit state includes: the impedance value corresponding to the feedback quantity is less than or equal to the short-circuit impedance value; the output energy of the short circuit state is 0. This feedback quantity can be realized by a circuit, for example: the parallel short circuit detection circuit samples the voltage of the output voltage, generates a short circuit detection signal according to the voltage sampling result, and then sends the short circuit detection signal to the single chip microcomputer, and the single chip microcomputer controls the switch module at the energy supply end to be switched on or switched off according to the short circuit detection signal. When the switch module is switched off, the output energy of the energy providing module can be 0, and then the output energy of the cutter head component is 0, so that short-circuit protection is realized, and the safety of the surgical system is improved. Fig. 3 is a schematic structural diagram of a short-circuit detection circuit according to an embodiment of the present invention, and as shown in fig. 3, 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 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.
In one embodiment, the determination condition of the protection state includes: determining that the impedance value corresponding to the feedback quantity is larger than the short-circuit impedance value and is smaller than the excitation impedance value; the output energy of the protection state is an energy safety value. The plasma requires a suitable ignition impedance and a corresponding ignition voltage to ignite. In normal operating conditions, the excitation voltage generally meets the requirements, but the impedance value changes with the operating conditions of the head part. When the impedance value corresponding to the obtained feedback quantity is smaller than the excitation impedance value, the output power corresponding to the working current is increased, at the moment, output energy protection is needed, and the output energy is limited within an energy safety value so as to ensure the continuous excitation of the plasma.
In one embodiment, the determination condition of the normal state includes: determining that the impedance value corresponding to the feedback quantity is larger than the excitation impedance value; the output energy in the normal state is as follows: determining a corresponding peak power and power curve based on the type of the plasma cutter head component; and determining the power output to the plasma cutter head part according to the peak power, the power curve and the impedance value corresponding to the feedback quantity. Apart from the two states described above, the surgical system mostly works in a normal state. In this embodiment, the output voltage of the dc power supply control module in the surgical system has different gears, for example, 10 gears, each gear corresponds to a different voltage, for example, the 10 th gear of the highest gear corresponds to 65V, the rest gears are sequentially decreased in a decreasing manner, and the output end of the plasma energy output module is the output end of the plasma energy control system. The plasma energy control system comprises an external interface connected with a surgical knife head and a foot switch, the output end of the plasma energy output module can be connected with the surgical knife heads of different models through the external interface of the control panel, the models of the surgical knife heads connected with the output end of the plasma energy control system are different, and the energy required by the surgical knife heads is also different. Accordingly, the power output by the plasma energy control system needs to meet different peak powers and power curves. The peak power and the power curve corresponding to the surgical knife heads of different models can be set by an operator according to actual needs, for example, when the knife head A is used, the set peak power is 300W, the output power of the plasma energy control system needs to meet the power curve A, the peak power control circuit acquires the sampling current in real time, then the sampling current is amplified to generate a voltage signal, and the voltage signal is sent to the single chip microcomputer, and the voltage signal substantially corresponds to the real-time impedance between two poles of the knife head. The single chip microcomputer can calculate the working period corresponding to the switch module when the peak power is 300W and the power curve A is met according to the received voltage signal, and therefore a switch control signal is generated to control the switch module to be switched on or switched off. Different voltage signals correspond to different preset peak power and preset power curves.
In one embodiment, said determining power output to said plasma head section comprises: determining a duty cycle of a control signal, the duty cycle comprising an on-time and an off-time; the control signal is used to control the turning on and off of the dc power to the plasma cutter head component. Specifically, for a cutter head of the same model, for example, 200 ohms is preset as a peak power point, and when the measured impedance is smaller than 200 ohms, the work cycle of the single chip microcomputer control switch module is about 500ms, wherein the off time is about 110 ms. When the measured impedance is 50 ohms, in order to adapt to a preset power curve, the working period of the singlechip control switch module is about 140ms, wherein the disconnection time is about 110ms, so that the output power of the plasma energy control system is always controlled in a required range.
And further, the control signal keeps the off time unchanged and only changes the on time when the peak power is unchanged. Compared with the prior art, the working cycle in the embodiment is composed of the off time and the working time, and when the preset peak power is not changed, namely the gear is not changed, the off time is kept unchanged. When the measured impedance is lower than the exciting impedance value of the plasma, the working time is shortened only by adjusting the working time, and meanwhile, the off-time is kept unchanged, so that the working period is shortened. And in the off time, the switching circuit is charged and stored with energy through the direct current power supply control module. The implementation mode provided by the invention can adjust the working period of the switch module according to the preset peak power and the preset power curve, and because the switch circuit is disconnected for energy storage when the impedance is lower than the excitation impedance value of the plasma, the working period is short in a certain range, the instantaneous power is increased, the explosion energy is strong, and the problems that the instantaneous energy excitation is weak, the plasma is not easy to generate and the like can be effectively avoided. Use the surgical system among this embodiment in the operation process, when having attached to the tissue on the scalpel head, appear gluing the sword phenomenon promptly, the sword impedance changes, if do not solve and glue the sword problem, can seriously influence the operation effect, and this embodiment is because switch circuit disconnection energy storage, and the excitation energy time is short in the twinkling of an eye, and the plasma that utilizes energy generation in the twinkling of an eye can be knocked the tissue that attaches at the sword, solves the problem of gluing the sword fast, in addition because this embodiment can continuously output plasma energy, consequently has the cutting fast, efficient advantage.
In an embodiment, the feedback component comprises one or a combination of: the current transformer, the sampling resistor and the parallel sampling unit. The operating voltage and current of the surgical system are responsive to the operating condition of the cutter head member, and the feedback generated by the operating feedback member is responsive to the operating voltage and current. The current transformer, the sampling resistor and the parallel sampling unit have different advantages and application scenes, and the accurate feedback quantity can be obtained by selecting the current transformer, the sampling resistor, the parallel sampling unit and other electrical elements.
In one embodiment, the energy control component includes a number of energy control sub-components that respectively perform energy output control in the short circuit state, the protection state, and the normal state. The aforementioned energy output control may be executed by one control unit, or may be executed by a plurality of control units, respectively. For example, control logic or control circuitry may be employed, each of which may be advantageous. The circuit mode implementation of the energy output control in the short-circuit state has the advantage of high reaction speed, and can be implemented by adopting the circuit in the figure 3. The protection state and the normal state can adopt a single chip microcomputer control mode to implement more complex logic control.
In one embodiment, the energy control sub-assembly includes a single chip or comparator. The control logic needs to compare the resistance corresponding to the feedback quantity with a preset short circuit resistance value or an excitation resistance value. As mentioned above, the implementation can be performed by using a controller or a control circuit. The core that the controller realized lies in the singlechip, can set up according to user's demand and predetermine the logic, carry out the judgement function. The core of the control circuit is the comparator, which can compare two electrical parameters and output a result, and has the advantage of quick response.
The technical scheme in the embodiment can control energy output based on the real-time working condition of the cutter head part, keep the stability of plasma excitation and effectively improve the cutting efficiency.
The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited thereto. Within the scope of the technical idea of the invention, numerous simple modifications can be made to the technical solution of the invention, including combinations of the specific features in any suitable way, and the invention will not be further described in relation to the various possible combinations in order to avoid unnecessary repetition. Such simple modifications and combinations should be considered within the scope of the present disclosure as well.

Claims (10)

1. An impedance-adaptive plasma surgical system, comprising: a plasma cutter head part for applying the generated plasma to a target; characterized in that the surgical system further comprises:
a feedback component configured to generate a feedback quantity based on a condition of the plasma cutter head component;
an energy control component configured to determine an energy output to the plasma head component based on the feedback amount.
2. The impedance-adaptive plasma surgical system of claim 1, wherein the determining the energy output to the plasma head section based on the feedback amount comprises:
determining that the energy control part is in one of a short-circuit state, a protection state and a normal state based on the feedback quantity;
determining an energy output to the plasma head section based on the determined state.
3. The impedance-adaptive plasma surgical system of claim 2, wherein the determination condition of the short circuit condition comprises: the impedance value corresponding to the feedback quantity is less than or equal to the short-circuit impedance value; the output energy of the short circuit state is 0.
4. The impedance-adaptive plasma surgical system according to claim 2, wherein the determination condition of the protection state comprises: determining that the impedance value corresponding to the feedback quantity is larger than the short-circuit impedance value and is smaller than the excitation impedance value; the output energy of the protection state is an energy safety value.
5. The impedance-adaptive plasma surgical system according to claim 2, wherein the determination condition of the normal state comprises: determining that the impedance value corresponding to the feedback quantity is larger than the excitation impedance value; the output energy in the normal state is as follows:
determining a corresponding peak power and power curve based on the type of the plasma cutter head component;
and determining the power output to the plasma cutter head part according to the peak power, the power curve and the impedance value corresponding to the feedback quantity.
6. The impedance-adaptive plasma surgical system of claim 5, wherein the determining the power output to the plasma head section comprises:
determining a duty cycle of a control signal, the duty cycle comprising an on-time and an off-time;
the control signal is used to control the turning on and off of the dc power to the plasma cutter head component.
7. The impedance-adaptive plasma surgical system of claim 6, wherein the control signal maintains an off-time and only changes the on-time while the peak power is constant.
8. The impedance-adaptive plasma surgical system of claim 1, wherein the feedback component comprises one or a combination of:
the current transformer, the sampling resistor and the parallel sampling unit.
9. The impedance-adaptive plasma surgical system of claim 2, wherein the energy control component comprises a number of energy control subcomponents that respectively perform energy output control in the short circuit state, the protection state and the normal state.
10. The impedance-adaptive plasma surgical system of claim 9, wherein the energy control subcomponent comprises a single chip or comparator.
CN202011148364.6A 2020-10-23 2020-10-23 Impedance adaptive plasma surgical system Pending CN112155718A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202011148364.6A CN112155718A (en) 2020-10-23 2020-10-23 Impedance adaptive plasma surgical system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202011148364.6A CN112155718A (en) 2020-10-23 2020-10-23 Impedance adaptive plasma surgical system

Publications (1)

Publication Number Publication Date
CN112155718A true CN112155718A (en) 2021-01-01

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CN202011148364.6A Pending CN112155718A (en) 2020-10-23 2020-10-23 Impedance adaptive plasma surgical system

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Country Link
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