System and method for controlling patient leakage current in surgical systems

Abstract

The present invention provides a control console and method for supplying drive signals to surgical instruments. [Solution] The control console 22 includes a transformer 90 having a primary winding 84 and a secondary winding 88. The primary winding receives an input signal from a power supply 82 and induces a drive signal 104 in the secondary winding to supply a drive signal 105 to the surgical instrument 28. A first current source having a leakage control winding is coupled to the drive signal path. The primary winding induces a first offset current in the leakage control winding to be injected into the drive signal path to offset the leakage current 62. A sensor 106 coupled to the drive signal path outputs a detection signal to provide feedback related to the leakage current. The sensor can be connected to a second leakage current offset source and / or fault detection stage. The power supply can be variable and can also energize the second current source.

Description

Technical Field

[0001] This disclosure generally relates to supplying a drive signal to an electrosurgical instrument, and more particularly to a control console designed to reduce patient leakage current from / to the drive signal. signal / drive signal. It relates to a console.

[0002] [Cross - Reference to Related Applications] This patent application claims the priority and all benefits of U.S. Provisional Patent Application No. 62 / 595,235, filed on December 6, 2017, which is incorporated herein by reference in its entirety.

Background Art

[0003] An electrosurgical instrument system can be considered to have three basic components. A control console generates a drive signal having the features necessary to operate a second component of the system, namely a power generator. The power generator converts the electrical energy of the drive signal into another form of energy. Examples of the type of energy into which electrical energy is converted include mechanical energy, thermal energy (heat), and photon energy (light). The third component of the instrument system is an energy applicator. The energy applicator receives the energy output by the power generator and applies this energy to a target tissue to perform a specific treatment operation. Some instrument systems are designed to apply electrical energy directed at a target tissue. In this type of system, the power generator is essentially a conductor through which the drive signal is applied to an exposed electrode, and through this exposed electrode, current is supplied to the tissue. The electrode is the energy ​​​​​​​​​​​​​​​​​​​​It functions as an applicator. The electrodes are placed on the patient or integrated into the handpiece. They can be combined. Other equipment systems are designed to provide mechanical energy. In this type of system, the power generator provides electrical energy, such as an AC drive signal, to the machine. Energy is converted into, for example, vibration, which is then applied to the patient through the handpiece.

[0004] An essential part of many surgical instrument systems is the surgical instrument itself, which is the handpiece. This is possible. At a minimum, the handpiece is designed to be held by the physician. It is a physical component from which the energy applicator extends. In this case, the power generator is housed within this surgical instrument. One such instrument is designed These surgical instrument systems are ultrasonic surgical instrument systems. The device comprises a power generator including one or more drivers. Each driver is marked with an AC signal. It vibrates in response to the input. The horn is mechanically coupled to the driver in close proximity. Energy - The chip that functions as an applicator extends distally from the horn. Vibration promotes similar vibrations in the horn and even the tip. Vibration tip on tissue This movement leads to tissue ablation, or removal.

[0005] Many electric surgical instrument systems share unique characteristics with other electric assemblies. This means that parasitic capacity exists across the components of these systems. Capacitance is the capacitance that exists across two components under non-uniform voltage conditions. As a result of this capacitance, a parasitic alternating current flows through one of the components. There is a possibility that a surgical instrument may be affected by the power generation unit to which an AC drive signal is applied. If provided, the metal structural components of the surgical instrument and the inside of the surgical instrument through which the electric current flows Due to parasitic capacitance between the power generation component and the metal structural component, Parasitic currents may flow. These parasitic currents are one of the causes of what is known as leakage current. Generally, leakage current flows through components of a system to which current is applied for other purposes. It is an unintended flow of electric current. More specifically, patient leakage current is an unintended flow of electric current through the patient. It is a flow of current that cannot be controlled.

[0006] During the procedure, there is a possibility that the patient may be accidentally connected to the earth ground. In such cases, leakage current can flow from surgical instruments into the patient's body. This poses a risk to the patient. To avoid danger, the electric surgical instrument system will be designed so that the patient is grounded. In scenarios and other settings, the design should minimize leakage current flowing through the patient. Therefore, when surgical instruments that may have leakage current are applied to a patient, leakage current Theoretically, this current could flow through the patient to this ground. This current is in the patient's vessel This could have a negative impact on the functions of government and organizations.

[0007] For these reasons, surgical instrument clusters equipped with surgical instruments intended for application to patients The stem is designed to ensure that the normal leakage current is less than 100 μAmp. It is equipped with surgical instruments intended for application to cardiac tissue. The stem is designed so that the normal leakage current is less than 10 μA when used in the United States. must be calculated. These requirements are based on the IEC60601 Medical Design Standards. The IEC60601 standard also describes the process of testing an electrosurgical instrument to ensure that the leakage current is below these maximum amounts. It is a further requirement that the instrument applied to the patient cannot function as a connection to the ground. Mainly, when a voltage from another source is applied to the patient somehow, the instrument should not function as a connection to the ground through which current will flow through the patient. The electrosurgical instrument system can have an output isolated from the ground to prevent current leakage. However, an isolated output circuit alone is not sufficient to reduce the leakage to an acceptable level. Some electrosurgical instrument systems are designed to have a function that can detect an open circuit and accordingly reduce the peak output voltage of the system. This leads to some performance problems. The peak output voltage is necessary to initiate spark generation for an appropriate coagulation effect. By reducing the peak output voltage to minimize leakage current, the performance of the instrument system may deteriorate. Furthermore, depending on the length of time required for the generator to detect an open circuit state, there may be an instantaneous voltage spike, which may cause leakage current to occur. One way is to reduce the parasitic capacitance to reduce the parasitic current. When the instrument is an ultrasonic surgical instrument, the driver and what is intended to be vibrated by the driver

[0008]

[0009]

[0010] By providing an electrical insulation impedance disk between the horn, which is one of the mechanical components of the surgical instrument, the parasitic capacitance can be reduced. The disadvantages associated with providing these disks are that such disks attenuate the transmission of vibrations from the driver to the horn and the chip. This mechanical attenuation reduces the efficiency of the surgical instrument. SUMMARY OF THE INVENTION PROBLEMS TO BE SOLVED BY THE INVENTION

[0011] Therefore, it is necessary to address at least the above-described technical drawbacks of the conventional systems and methods. MEANS FOR SOLVING THE PROBLEM

[0012] In one embodiment, a control console for supplying a drive signal to a surgical instrument and a method of operating such a control console are provided. The control console includes a transformer having a primary winding and a secondary winding. The primary winding is configured to receive an input signal from a power source and to induce a drive signal in the secondary winding to supply the drive signal to the surgical instrument. The control console further includes a first current source having a leakage control winding coupled to the path of the drive signal, and the primary winding is configured to induce a first canceling current to be injected into the path of the drive signal to cancel the leakage current in the leakage control winding. The control console also includes a sensor coupled to the path of the drive signal, and the sensor is configured to output a detection signal to provide feedback related to the leakage current.

[0013] In another embodiment, a control console that supplies drive signals to surgical instruments, and such control This provides a method for operating the control console. The control console has a primary winding and a secondary winding. The transformer is equipped with the following: The primary winding is configured to receive input signals from the power source and surgical It is configured to guide the drive signal to the secondary winding in order to supply a drive signal to the device. The control console has a first current source with a leakage control winding coupled to the drive signal path. Furthermore, the primary winding is designed to cancel out the leakage current of the drive signal in the leakage control winding. The sensor is configured to induce a first canceling current to be injected into the path of the moving signal. , to detect the characteristics of the input signal and to output a detection signal related to the characteristics of the input signal. It is configured in such a way. A second current source is coupled to the drive signal path. A variable gain device is coupled to the second current source. A selection interface is used for the second current Coupled to a current source and a variable gain device, one of several leakage current adjustment settings is selected. This enables and provides the variable gain device with the selected leakage current adjustment setting. It is configured such that the variable gain device is selected to receive the detection signal. The detection signal is configured to change based on the leakage current adjustment setting. Second current source This generates a second cancel-out current based on the modified sensing signal from the variable gain device. In addition, a second canceling current is introduced into the drive signal path to cancel out the leakage current of the drive signal. It is designed to be injected.

[0014] In another embodiment, a control console that supplies drive signals to surgical instruments, and such control This provides a method for operating the control console. The control console includes a variable power supply and a transformer. The transformer comprises a primary winding and a secondary winding. The primary winding is a variable power supply. It is coupled to receive input signals from a variable power supply and to supply drive signals to surgical instruments. The secondary winding is configured to induce a drive signal to supply current. It is coupled to the path of the motion signal and also to the variable power supply. The variable power supply supplies current to the current source. It is configured in such a way that the current source cancels out the leakage current of the drive signal. It is configured to generate a counteracting current that should be injected into the circuit.

[0015] These embodiments are cumbersome additional devices that reduce the output power of surgical instruments. This allows the control console to maintain low leakage current without the need for the control console. This provides the ability to monitor the drive signal for leakage current (and thus further leakage (This allows for the addition of control and fault detection stages), and / or excites the drive signal and passes it to the leakage control source. Multiple benefits, including simplification of the control console by using a single power supply to power it. Provides points. Control consoles and methods described herein and embodiments thereof Further advantages will be understood in relation to the explanation provided herein.

[0016] The advantages of the present invention, when considered together with the accompanying drawings, should be referred to in the following detailed description. As the present invention is better understood, it will become easier to understand. [Brief explanation of the drawing]

[0017] [Figure 1] This figure shows one embodiment of an electrically operated surgical instrument system comprising a control console and surgical instruments. [Figure 2]This is a diagram illustrating the operation of a feedback loop for measuring and canceling leakage current, using one example. [Figure 3] This is a schematic diagram illustrating two power sources that cancel out leakage current in an electrically operated surgical instrument system, as an example. [Figure 4] This is a schematic diagram of one embodiment of an electrically operated surgical instrument system, comprising a control console including two leakage current cancellation stages and current-based detection of leakage current. [Figure 5] This is a schematic diagram of another embodiment of a motorized surgical instrument system, comprising a control console including two leakage current cancellation stages and voltage-based detection of the drive signal. [Figure 6] This is a schematic diagram of an alternative embodiment of another embodiment of an electrically operated surgical instrument system, which includes a control console comprising two leakage current cancellation stages and a technique for adjusting the leakage current setting. [Figure 7] This is a schematic diagram of another embodiment of an electric surgical instrument system, comprising a control console including two leakage current cancellation stages and a fault detection stage for leakage current. [Figure 8] This is a schematic diagram of a circuit included in a fault detection stage according to one embodiment. [Modes for carrying out the invention]

[0018] I. Overview Similar figures in several diagrams indicate similar or corresponding parts; please refer to the diagrams. Then, an electric surgical instrument system 20 is provided, electric surgical instrument system 20 The control console 22 is configured to supply a drive signal 105 to the surgical instrument 28. To possess.

[0019] Here, we will refer to the embodiments illustrated in the drawings and describe the embodiments using specific terminology. To clarify, by using specific language to describe exemplary embodiments, this No limitation on the scope of the disclosure is intended. Any modifications of the features of the invention exemplified herein and further modifications that would ordinarily be conceived by those skilled in the art Modifications and any further applications of the principles of this disclosure as illustrated herein are not applicable to the claims. It should be considered to be within the scope of this disclosure.

[0020] Here, the electric surgical instrument system 20 will be briefly described with reference to Figure 1. The electric surgical instrument system 20 will henceforth be referred to as "System 20" for simplicity. The stem 20 is equipped with a surgical instrument 28. The surgical instrument 28 is an ultrasonic surgical instrument, or R It can be an electrosurgical energy application device of type F or other types. Surgical instrument 28 may comprise a shell or a body 30. The body 30 is a surgical instrument 28, medical This is the part that is actually held by the doctor. The main body 30 forms the proximal end 29 of the surgical instrument. The term "proximal" refers to the side closest to the physician holding the surgical instrument, and also to the outside. It is understood that the proximal end 29 is the part furthest from the site 33 to which the medical instrument 28 is applied. On the opposite side is the distal end 31 of the surgical instrument 28. The term "distal" is used by physicians. This means the side that is farther away and closer to the site 33 to which the surgical instrument 28 is applied. It will be understood.

[0021] The control console 22 is part of the system 20. The control console 22 is a surgical instrument 28 supplies a drive signal 105 (described later) via the cable 32 to which it is connected. In embodiments where instrument 28 is an ultrasonic surgical instrument, the cable 32 and external are not essential, but It is desirable to assemble the medical instruments 28 into a single unit. The control console 22 receives signals. Includes components that function as generators. These components are surgical instruments 2 The transformer generates a drive signal 105, for example, an AC signal, which is applied to the power generator 27 of 8. The power generator 27, also called a deuser, applies an AC signal to the patient in a surgical procedure. Converts to energy. For example, in an ultrasonic surgical instrument 28, the power generator 27 converts electrical energy It can be a piezoelectric stack that converts energy into vibration. Alternatively, RF surgical instrument 2 In 8, since electrical energy is applied directly to the patient through electrodes, the power generator 27 is not This may be necessary. The surgical instrument 28 shown in Figure 1 has a tip of the surgical instrument at its distal end 31. It is configured to apply ultrasound or RF energy to the patient through the device. Surgical energy - Through electrodes or other surgical instruments not described herein, patient tissue 33 It can also be applied to the control console 2. Regardless of the type of energy applied, Device 2 is designed to minimize the possibility of leakage current into the patient's body.

[0022] A control interface 24 is connected to the control console 22. In Figure 1, the control interface 24 is connected to the control console 22. Interface 24 is a foot pedal. The state of control interface 24 is the control console. It is monitored by the processor 35 in the 22. The control interface 24 is controlled by the control controller The activation and / or specific control of the surgical instrument 28 via the sole 22 is regulated. It is a user-operated control member. In Figure 1, the control interface 24 has several pedals. Shown as part of a foot pedal assembly including the irrigation pump, suction pump. Alternatively, additional pedals can be used to control devices such as lighting. The Toughface 24 can have configurations other than the foot pedal as shown in Figure 1.

[0023] The control console 22 is a user interface such as a graphical user interface or switches. It can also be further equipped with an interface 26. Similar to the control interface 24, user Interface 26 is monitored by the processor 35 in the control console 22. The interface 26 allows the physician to control the operating parameters of the surgical instrument 28. It is controlled to do so. In the ultrasonic embodiment, such operating parameters are surgical The amplitude of the vibration of the device 28 can be specified.

[0024] The control interface 24 and the user interface 26 send commands to the system 20. It is understood to be a general representative of the means of input. In some structures of System 20, A single control unit can perform both functions. For example, a lever or a foot pedal. When the dull is pressed for the first time, the system 20 presses the tip head of the surgical instrument 28. The system 20 is configured such that the dot undergoes vibration cycles with relatively small amplitudes. This is possible. As a result of continuously pressing the lever or foot pedal, the control console 22 The surgical instrument 28 is subjected to vibration cycles with a larger amplitude so that the tip head receives vibration cycles with a larger amplitude. Reset the applied drive signal 105.

[0025] The control console 22 may be equipped with a display 34. The image can be generated by the processor 35 in the control console 22. The information shown in Play 34 is not limited to, but relates to User Interface 26. Information to be used, information to identify surgical instruments 28 and tips, and information to be used to identify the operation of the system 20. Other information that describes the status or notification may be included. Display 34 is a touchscreen. It can be a single display. In these versions, on display 34 By pressing the image of the button presented, the processor 35 in the control console 22 Commands can be entered. Display 34 shows an image and processor 35 To facilitate the input of commands, between the display 34 and the processor 35 Any suitable interface component can be provided. In the disclosed embodiments... Further details regarding the processors that can be used can be found in International Application PCT / US2016. The application is included in / 031651, and the contents of that application are in International Publication No. 2016 / 183084 / USA National Patent Application Publication No. The contents of those applications are included in the number, and by reference they are included in the number. This entire document shall constitute part of this specification.

[0026] The processor 35 adjusts the output of the drive signal 105 from the control console 22. The physician control input that sets the drive signal 105 for the sesser 35 is the control interface 24 and / Alternatively, it can be based on the state of the user interface 26, via the display 34. The input commands can also be used to control the settings of the drive signal 105. The characteristics of the drive signal 105 are based on data read from the memory of the surgical instrument 28. It can also be set. The drive signal 105 is driven by the control console 22. These multiple signals are also used as feedback signals that further contribute to the setting of signal 105. Based on the input, the processor 35 outputs a signal to control the drive signal 105.

[0027] Referring to Figures 4 to 7, the control console 22 is equipped with a power supply 82 or otherwise. It is coupled to power supply 82. Power supply 82 applies an input signal to the primary winding 84 of transformer 90. It is configured in such a way. The input signal from the power supply 82 is sent to the primary winding 84 of the transformer 90. It is applied to the tap. The transformer 90 electrically isolates the patient-side circuit from the power supply 82. Voltage 90 prevents any DC component of the signal in the primary winding 84 from being transmitted to the secondary winding 88. To isolate the core and minimize capacitive coupling, the insulation shown as core 98 in Figures 4-7 is used. It can be designed to have a body.

[0028] The taps at both ends of the primary winding 84 are each coupled to a linear amplifier 86. 6 applies an AC signal with varying potential and frequency to the tap of the primary winding 84. The base signal applied to amplifier 86 as the signal is the signal output by amplifier 86. The frequency and potential are adjusted. One embodiment in which the system 20 includes an ultrasonic surgical instrument 28. Therefore, the AC signal generated across the primary winding 84 has a frequency of 10kHz to 100kHz. This signal may have at least 200 volts or more of peak-to-peak power. It can have pressure. In other applications such as RF treatment, the AC signal is as described herein. It may have a frequency and voltage range other than those specified.

[0029] The structure of the power supply 82 and the linear amplifier 86 is not limited to the specific embodiments shown herein. These may include different configurations that generate AC signals across the primary winding 84. Further understanding of the subassembly can be found in international application PCT / US2016 / 031651. It can be filed, and the contents of that application are International Publication No. 2016 / 183084 / U.S. Patent Application Public release No. The contents of those applications are included in the number, and by reference, the whole is the present. This shall form part of the detailed document.

[0030] The AC signal generated across the primary winding 84 is transmitted to the secondary winding 88 of the transformer 90. This induces a signal. This signal, which spans the secondary winding 88 of the transformer 90, is transmitted via cable 32. This is a drive signal 105 applied to the power generator 27 inside the surgical instrument 28. Cable 32 is , a high-voltage side conductor 100 containing a high-potential current flowing toward the surgical instrument 28, and the surgical instrument It includes a low-voltage side conductor 102 containing a low-potential current that flows away from 28. The path 104 (also referred to as the "drive path") is defined by these conductors 100 and 102. The drive signal 105 is the current passing through the drive path 104. The drive signal 105 is the ultrasonic drive In one embodiment used to operate the driver, the drive signal is at least 500V It has an AC voltage and can exceed 1000VAC.

[0031] The drive path 104 is surrounded by the shield 99. The shield 99 is on the high-voltage side This prevents parasitic capacitance between the conductor 100 and the ground or any object near the drive path 104. Furthermore, a shield can be attached to the low-voltage side conductor 102 within the surgical instrument 28. In embodiments where this connection exists, the shield 99 also serves as a secondary path for the return current. It acts to protect the patient in the event of a break in the low-voltage side conductor 102.

[0032] II. Techniques for detecting and canceling leakage current According to the techniques described herein, System 20 controls patient leakage current (also known as "leakage current"). A leakage cancellation technique can be employed to cancel out the leakage current (which is called). Leakage current is generally surgical This is the electric current flowing through the patient connected to the device 28. The leakage current is controlled by the control console 22. The fluid may flow from the patient to the surgical instrument 28 and then to the earth ground. Leakage current is generally an unintended flow of current through a patient.

[0033] As can be understood from the examples described herein, system 20 uses active control, and Leakage current cancellation can be employed using a combination of active and passive control. The control technique employs elements that make decisions based on input signals or feedback signals. Dynamic control techniques passively provide leakage current cancellation without making active decisions, such as transformers and resistors. Components such as capacitors, inductors, and other elements are employed. Active control techniques supplement active devices. This may include passive elements. One or more can be included in the control console 22.

[0034] In one embodiment shown in Figure 3, a first supply source 68' and a second supply source cancel out leakage current. An equivalent circuit illustrating the operation of the power source 74' is provided. The first power source 68' is passive. The first power source is shown as an AC voltage source. The second power source 74' is active and is shown as a variable AC voltage source. As shown, the first supply source 68' generates the first canceling current 80', and the second supply source 74' generates the first canceling current 80'. A second canceling current 122' is generated. For this purpose, the first supply source 68' and the second supply source 7 4' generates canceling currents 80' and 122' respectively, as shown in Figure 3. These are current sources. The supply sources 68' and 74' are referred to as current sources in this specification.

[0035] The power indicator 56 (equipped with power supply 82 and transformer 90) indicates a drive signal 1 for the surgical instrument 28. Generates 05. The canceling currents 80' and 122' are supplied by these sources 68' and 74'. The signal is then injected into the drive signal 105 or into the path 104 of the drive signal 105.

[0036] In this equivalent schematic diagram, the first current source 68' is illustrated as being in series with the capacitor 70. The second current source 74' is in series with capacitor 76. The impedance 58 is for surgical use The resistor 66 represents the known impedance of the instrument 28, and the variable impedance passing through the surgical site 33 is - Representing the dance, capacitors 60 and 64 are the high-voltage side conductor 100 and the low-voltage side, respectively. This represents the capacitance with respect to conductor 102. Such capacitance may be parasitic, and This results in the generation of a leakage current 62. In this example, the leakage current in the drive signal 105 The current 62 moves through the capacitor 60.

[0037] According to the IEC60601 medical design standard, the electric surgical instrument system 20 has leakage current The current should be maintained at 100 μAmp or less. The electric surgical instrument system 20 is a cardiac assembly. When designed for use on or near weaving, the maximum leakage current is 10 μA. They are a pair.

[0038] In some embodiments, the first current source 68' handles the majority of the leakage current 62 (e.g., 5 It is designed to cancel out 0% to 90%. The second current source 74' cancels out the first current The second to cancel out at least some of the residual leakage current 62 that remains after cancellation by current 80' This generates a canceling current 122' of 2. This residual leakage current 62 is, for example, the total leakage current. It could be 1% to 40% of 62. In one example, the first current source 68' is a small amount Residual leakage current, for example, a patient leakage current of ±40 μA, with a maximum patient leakage of ±500 μA. It can be designed to cancel out the leakage current. In another example, the second current source 74' is leakage This can cancel out most of the current 62.

[0039] In an ideal control console 22, the leakage current 62 of the drive signal 105 is the first canceling current. This is equal to the current obtained by adding the second canceling current 122' to 80'. An alternative embodiment is a single Any combination of an active current source or a passive current source, an active current injection source and / or a passive current injection source. You can use either or any multiple of those groups.

[0040] As can be understood from the embodiments described herein, the second (active) current source 74 is the It includes additional components other than the component that actually generates the canceling current 122 of 2. These additional components, for example, provide a second canceling current 122. This can help determine how or when it should be produced. Therefore, this specification The phrase "second current source" used in this document is not limited to current-generating components only. do not have.

[0041] Referring now to Figures 4 to 7, further embodiments of the first current source 68 and the second current source 74 are described. Let me explain. The first current source 68 can also be called a matched current source. One implementation Depending on the configuration, the first current source 68 includes a leakage control winding 92. The leakage control winding 92 is tuned It can also be called a winding or a detection winding. The transformer 90 includes a leakage control winding 92. The leakage control winding 92 can be integrated with the transformer 90. An example of how both of the 94 can be integrated with the transformer 90 is in the international application PCT / It is described in US2017 / 034437, and the contents of that application are published in the International Patent Application No. The contents of those applications are published in issue number [number], and by reference, the entirety of those applications constitutes part of this specification. The first current source 68 may also include a capacitor 96.

[0042] The current is induced by the primary winding 84 across the leakage control winding 92. The conduction promotes the generation of the first canceling current 80 by the first current source 68. The current 80 is injected into the low-voltage side conductor 102 of the drive signal path 104. Figure 4 shows the low voltage This shows the first canceling current 80 injected into the side conductor 102, but to cancel out the leakage current 62. Therefore, a canceling current of opposite polarity can be injected into the high-voltage side conductor 100. In an embodiment where the wire 22 includes a transformer 90 that generates a drive signal 105, the first current source One or all of the components forming 68 into a single unit with transformer 90 It can be constructed.

[0043] Further details regarding the structure of the transformer 90 and the first current source 68 can be found in the international application PCT / US It can be found in publication number 2017 / 034437, and the contents of that application are as follows: International Publication No. It was published in issue number [number], and the contents of that application have already been incorporated by reference.

[0044] A. Closed-loop leakage current cancellation control Refer to Figures 2, 4, 5, and 7 to offset at least some of the leakage current 62. To that end, an embodiment of the second current source 74 employed by the control console 22 Let me explain. In one example, the second current source 74 takes at least some of the leakage current 62. The feedback can be a measured value of the current or voltage of the drive signal 105, which cancels out the negatives. Use the signal.

[0045] The cancellation of leakage current 62 by using a feedback signal is shown in the control route in Figure 2. For example, one or more sensors 36 measure the characteristics of the drive signal 105 and the leakage current 62 It outputs a detection signal 110' related to the leakage current 62. This can be a current, voltage, or any characteristic that indicates a known or determinable relationship. Target value 1 '14' is set, and it can be 0 or any other positive or negative value. The target value 114' can be a target signal including current amplitude or voltage. 4' can include both AC and DC components. Detection signal 110' and target value 1 The difference from 14' is calculated, and an error signal 44 is generated. In one embodiment, the error signal 44 The summing stage 40 adds the positive target value 114' to the negative number of the detection signal 110'. Therefore, it is calculated. Instead of this summation process, the detection signal 110' and the target value 114' and Many further methods can be used to find the difference.

[0046] The error signal 44 is multiplied by the gain device 46. The gain device 46 multiplies the error signal The value 44 can be increased, decreased, or kept the same. The gain device 46 is It can be a circuit, software, or a combination of both. The gain device 46 is , outputting a counter-current 122' which is injected into the drive signal 105 to cancel out the leakage current 62. The human body model 50 representing the surgical instrument 28 applied to the patient includes a counteracting current 122'. Power is supplied by the drive signal 105. The transfer function of the control loop is TF = G / (1 It can be expressed as (+S × G). In the formula, G represents the gain of 46 and S is the detection signal 110'. The principle illustrated in Figure 2 is the same as that of the surgical instrument system 20 shown in Figures 4, 5, and 7. It will be implemented in the form of implementation.

[0047] Figures 4 to 7 show surgical instruments related to reducing or eliminating leakage current 62. The components of stem 20 are shown. Figures 4, 5, and 7 show the passive (first) components, respectively. An embodiment is shown that includes a leakage current cancellation source 68 and an active (second) leakage current cancellation source 74.

[0048] The second current source 74 receives two inputs, namely the detection signal 110 and the target value 114. In one embodiment shown in Figure 4, the residual leakage current 62 in the drive signal 105 is detected. The transformer 106 is used to generate a detection signal 110. The primary winding is provided with a drive path 104. In other words, the primary winding of the transformer 106 is high The transformer 106 includes a voltage-side conductor 100 and a low-voltage-side conductor 102. The transformer 106 implements the sensor 108. It has a secondary winding to be applied.

[0049] Sensor 108 detects common-mode current in drive path 104, and common-mode current A detection signal 110 indicating current is output to the second current source 74. Common-mode current is leakage current. Provides some indication or relationship to 62. Mainly, the high-voltage side conductor 100 is a surgical device. Current is conducted to the vise, and the low-voltage side conductor 102 conducts current from the surgical instrument 28. Ideally, the currents 100 on the low-voltage side and 102 on the high-voltage side are equal in magnitude. The polarity is reversed. When leakage current 62 is present, the current in the high-voltage side conductor 100 is large. The size differs from the magnitude of the current in the low-voltage side conductor 102. This difference in current is the common Common-mode current is a measurement of current flowing in one direction. If a common-mode current exists along path 104, it is the secondary winding, i.e., the se A magnetic field is generated which is detected by sensor 108. In this embodiment, the high-voltage side conductor 10 CommonMo only occurs when some amount of current is lost between 0 and the low-voltage side conductor 102. Since a common-mode current will exist, the common-mode current is the leakage current of the drive signal 105 6 This is directly related to 2. If there is no leakage current 62, the high-voltage side conductor 100 is the low-voltage side conductor. The current across body 102 will be equal to and opposite to the current. In this case, common mode Both the current and the leakage current 62 in the electric surgical instrument system are 0 or substantially It is 0.

[0050] In Figure 5, sensor 108 is replaced with sensor 126, which is shown as a capacitor. The sensor 126 detects the voltage in the low-voltage side conductor 102 of the drive path 104. If no current 62 exists, the voltage across the low-voltage side conductor is 0 volts relative to the power supply 82. Or it will be approximately 0 volts.

[0051] The shield 99 is also electrically connected to the low-voltage side conductor 102 of the surgical instrument 28. In this embodiment, the common-mode current is instead the current in the high-voltage side conductor 100 and the low-voltage side conductor. This is the difference between the current in the pressure-side conductor 102 and the current in the shield 99.

[0052] In Figures 4, 5, and 7, the leakage current 62 leaks from the drive signal 105 and passes through a separate path. To represent the current that flows all the way to ground, the portion of the drive signal 105 in the low-voltage side conductor 102 This is exemplified as a small opposing current. This leakage current 62 is due to capacitive coupling between elements of the system 20. Loss in multiple ways and locations throughout the system, including leakage of current through the patient and / or patient. This is the result of a potential loss of current. Leakage current 62 occurs when an unintended current flow is generated. This can be exemplified at any location where it is being done. In some cases, the first canceling current 80 and The second canceling current 122 causes the leakage current to flow in the opposite direction to the leakage current 62 shown in the figure. This could result in a current of 62.

[0053] The detection signal 110 is received by one or more amplifiers, as shown in Figures 4, 5, and 7. It can be changed by the device. The detection signal 110 is the second canceling current 122 The current is then input to the second current source 74 for determination.

[0054] The second input to the second current source 74 is the target value 1 shown on the right in Figures 4, 5, and 7. The value is 14. The detection signal 110 and the target value 114 are input into an additive amplifier 118 with amplification 120. It is supplied to and a second canceling current 122 is output. In Figures 4 and 7, the target value 114 is This is the target current compared with the detection signal 110, and is used to determine the second canceling current 122. It is used. In this example, the target current is, for example, an ideal state where leakage current is eliminated. This can be represented as 0 amperes. In Figure 5, the target value 114 is, for example, similar to leakage. This represents the ideal state where the current is removed, and the target voltage can be set to 0 volts. Yes. Other target values ​​114 other than those specified herein are intended and utilized. It is possible.

[0055] As shown in Figures 4, 5, and 7, the power supply drives the second current source 74. This is the same power supply 82 that energizes the transformer 90. Power supply 82 is a second current source. Further aspects of 74 will be described later as they relate to it. Alternatively, a second current source 74 The power supply that provides power to it may be different from power supply 82. Second canceling current 1 Since DC power supply 82 is used to excite 22, the target value 114 is a certain amount of D It may have a C offset. The target value 114 is modified by the gain device 116. It can then be used as an input to an additive amplifier 118, which includes an additional amplification stage 120. It can be used. The summing amplifier 118 with amplification 120 is used with the target value 114 and the detected signal 1 The difference with 10 is calculated. Then, the summing amplifier 118 with amplification 120 generates a second canceling current 1 Output 22.

[0056] Before the second canceling current is injected into the drive path 104, any of the second canceling currents 122 To block the DC component from entering the drive path 104, capacitor 124 is used. This is possible. In some embodiments, capacitor 124 uses a low capacitance. .

[0057] This second canceling current 122 is the residual current remaining when the first canceling current 80 is injected. To offset at least some of the leakage current 62. Sensors 106, 126 used Regardless of the type, the second canceling current 122 is the magnitude of the current in the low-voltage side conductor 102. By changing this to more closely match the magnitude of the current in the high-voltage side conductor 100, Next, bring the voltage to power supply 82 close to 0 volts.

[0058] The equivalents of the active leakage current cancellation techniques shown in Figures 4, 5, and 7 are not disclosed and are not fully intended. The schematic diagrams shown in Figures 4, 5, and 7 still show the preferred canceling current as intended. While generating, it includes additional or different components to those specifically illustrated. It is possible.

[0059] B. Open-loop leakage current cancellation control Figure 6 shows another second current source 74 used to generate the second canceling current 122. An embodiment is shown. In this embodiment, the measured value from the drive signal 105 is not used. Instead In addition, it includes a sensor 130 that measures the AC signal generated by the transformer 90. In this example, the AC signal is the voltage of the handpiece of the surgical instrument 28. Sensor 130 is It can be part of the transformer 90 or added to the transformer 90. In the embodiment shown in Figure 6 Sensor 130 is a transformer winding.

[0060] Sensor 130 measures the AC signal generated across transformer 90 and detects the signal gain The signal is sent to stage 132, and the gain stage 132 scales the AC signal from sensor 130. It is configured in such a way. The variable gain device 132 can be made part of the second current source 74. It is possible, or it can be separate from the second current source 74.

[0061] A selection interface 134 is coupled to the second current source 74 and the gain stage 132. The selection interface 134 allows selection of one of several leakage current adjustment settings. It is configured to allow user-selectable fine-tuning of the leakage current 62. It provides offsetting. The leakage current adjustment setting is looked up in the memory of the control console 22. It can be saved to a table.

[0062] In the example shown in Figure 6, the selection interface 134 is a potentiometer, and it adjusts This will be a digital potentiometer controlled by an adjustable circuit or software. This is possible. The selection interface 134 also displays 34 on the control console 22. This can also be done through the user interface. Selection of leakage current adjustment settings. Other types of selection interfaces that would enable this are being considered.

[0063] The selection interface 134 allows for easier adjustment of positive or negative leakage current. The control console 22 is configured to comply with IEC60601, or any additional requirements for leakage current. Alternatively, adjustments can be made to meet different standards.

[0064] The selection interface 134 is coupled to the sensor 130 through the first gain stage 132. The selection interface 134 scales the AC signal from the first gain stage 132. The selected version is received. The selected interface 134 A variable gain amplifier 138 that can adjust the gain from -1 to +1 based on the adjustment settings. It is coupled to the following. If the selection interface 134 is a potentiometer, the variable gain Amplifier 138 interfaces with the potentiometer to control its operation. Includes output 136.

[0065] In one embodiment, the selection interface 134 is adjusted as part of the manufacturing process. This allows for higher manufacturing tolerances, and each control console 22 can reduce leakage current. This ensures that the requirements for minimizing the workload are met.

[0066] The output of amplifier 138 is powered by a power source such as power supply 82, which is the power source for the drive signal 105. It is supplied to the power amplifier 140. Alternatively, the second current source 74 uses a separate power supply. The amplifier 140 outputs the second cancellation current 122 to the drive signal path 104. The second canceling current 122 is injected into the capacitor 124 before it is injected into the drive signal 104. Therefore, DC is shut off.

[0067] Similar to the embodiments described in the preceding section in relation to Figures 4, 5, and 7, Figure 6 In this embodiment, the second canceling current 122 generated by the first current source 68 is generated It can be used together with the first canceling current 80, thereby canceling the leakage current 62 A fine-tuning of the kill function is provided.

[0068] Equivalents of the active leakage current cancellation technique shown in Figure 6 are not disclosed. The schematic diagram shows that, as intended, while still generating a suitable canceling current, the diagram specifically illustrates... The displayed item may include additional or different components.

[0069] C. Variable power supply for the second current source For any of the embodiments described herein and shown in Figures 4 to 7, the transformer 90 The power supply 82 coupled to the primary winding 84 can be a variable power supply. For example, The power supply 82 has a variable output DC voltage level that can be set. One implementation In this state, this voltage is 25VDC to 250VDC. Even if there is a variable voltage level Other types of power supplies can also be used. The voltage of the signal from power supply 82 is supplied to power supply 82. It is set based on the power control signal that is applied. Power supply 82 is connected to the primary winding 84 of transformer 90. A DC input signal can be applied to the center tap. The DC input signal from power supply 82 is , it can have a changing potential. Specifically, the potential of this input signal is a surgical instrument The drive signal 105 to be applied to the power generator 27 of 28 changes as a function of the potential It can be set to that.

[0070] This variable power supply 82 is supplied to any of the second current sources 74 shown throughout the figure. It can be used to power it, drive it, or otherwise provide it with input. The second current source 74 is coupled to the path of the drive signal 104 and also to the variable power supply 82. It is possible. The variable power supply 82 is configured to energize the current source 74, (variable power supply The current source 74 (powered by 82) is powered by the drive signal to cancel out leakage current of the drive signal It is configured to generate a counteracting current 122 to be injected into the path 104.

[0071] Specifically, the DC input signal from the power supply 82 applied to the primary winding 84 is shown in Figures 4 and 5. The input to one or more of the amplifiers 120 or 140 of the second current source 74 shown in Figure 7 is... It can also be used. Specifically, this DC input signal is supplied by the second current source 74. To enhance the amplification of the generated signal and ensure that the signal is at the correct voltage. It can be used as a positive voltage. In these versions, this DC signal is the input. It can also be applied as a signal to the second current source 74 (in Figures 4, 5 and 7, (This is shown as the power supply 82 that supplies power to the stage that generates the standard value 114). The second current source 74 is This includes a feedback subcircuit that adjusts the target value 114 from the variable power supply 82, Therefore, this signal is the result of a change in the DC positive voltage applied to one or more amplifiers. No drift. In the embodiment shown in Figure 6, the second current source 74 is connected to the amplifier 140. It is powered by the variable power supply 82.

[0072] The variable power supply 82 drives the second canceling current 122. In one embodiment, this is external The same power supply 82 is used to energize the drive path 104 for the medical instrument 28. By using 2, the power required to drive the second canceling current 122 is the drive signal Since it changes in proportion to the power of unit 105, a benefit can be obtained. Alternatively, use a separate power supply. This allows the second leakage current source 74 to be driven.

[0073] Reusing the variable power supply 82 to energize the leakage current canceling source is advantageous, but in practice The configuration may include a separate power supply for generating a second canceling current 122.

[0074] The variable power supply 82 may have configurations and capabilities other than those shown in the figure and described herein. It is possible. Furthermore, the variable power supply 82 is a component of the control console 22 other than those shown in the figure. It can be combined with the `nt`.

[0075] D. Fault detection techniques for leakage current Figure 7 shows an additional fault detection stage 144 that can be implemented in circuitry and / or software. This shows the same components as in Figure 4.

[0076] The fault detection stage 144 is coupled to sensor 106 or, alternatively, sensor 126 in Figure 5. The fault detection stage 144 receives detection signals 110 from sensors 106 and 126, and detects leakage current 6 It is configured to generate a fault detection signal 158 for detecting a fault condition related to 2. It is.

[0077] If the detection signal 110 indicates a level of leakage current 62 that exceeds a specified threshold, then, This may be caused by a malfunction in System 20, such as a short circuit or connection to the patient's ground. (Leakage current) If 62 is excessive, the fault detection stage 144 will detect a fault in the GPIO (General Purpose Input / Output) line. The harmful signal 158 is triggered.

[0078] The controller 160 is coupled to the fault detection stage 144, for example, on the GPIO line. The fault detection stage 144 receives a fault detection signal 158, and the leakage current 6 It is configured to determine fault conditions related to 2. The controller 160 receives instructions The algorithm stored in memory is used to process or control the operation of the control console 22. It may have one or more microprocessors that process the Zoom. Furthermore or alternatively Specifically, the controller 160 is a field programmer with one or more microcontrollers. Bullgate arrays, systems on chips, discrete circuits, and / or as specified herein Other suitable hardware, software, or other devices capable of performing the functions described above. It can be equipped with firmware. The fault detection stage 144 and the controller 160 are coupled It can be a combined element or a separate element.

[0079] The fault detection stage 144 is configured to detect the presence of a fault detection signal 158 within a predetermined period, and The system is configured to send a fault detection signal 158 to the controller 160 when a predetermined period of time has been reached. The fault detection stage 144 ensures that a persistent fault is detected, and To avoid false alarms based on very slight or intermittent signal spikes, It is possible to do so.

[0080] The controller 160 receives a fault detection signal 158 from the GPIO line, and this fault detection The system is configured to determine the fault condition by comparing the output signal 158 with a target value. R160 reduces the power to the surgical instrument 28 or strikes it depending on the assessment of the malfunction status. It can be cut off. Controller 160 is a control console other than those described herein. This can trigger other responses to the wire 22 or surgical instrument 28.

[0081] Figure 8 shows one embodiment of the fault detection stage 144. In some specific embodiments, The fault detection stage 144 detects when the detected common-mode current or undervoltage side voltage reaches a specified level. It becomes active only when it exceeds a certain value. The detection signal 110 is modified by the amplifier 112. This amplifier 112 is used to generate a second canceling current 122. It can be the same as the first gain stage, or it can be a separate gain device. The detection signal 110 is then supplied to the low-pass filter 146 and the rectifier 148. The low-pass filter 146 removes signals of higher frequencies that exceed a specified threshold. The low-pass filter 146 reduces the signal when the signal is relatively close to the filter frequency. It can also be attenuated. Using the gain device shown as amplifier 148, it is possible to adjust the attenuation to any desired level. The amplitude of the detection signal 110 can be changed. During the fault condition, the detection signal 110 , emits a pulse with each drive cycle (for example, when the drive signal 105 is at its maximum amplitude, The common-mode current detected by 108 is at its maximum, and the drive signal 105 is at its minimum vibration. When the width is such that the common-mode current approaches 0), capacitor 150 and resistor 152 The filters are positioned to maintain the fault condition at its maximum level during the pulse. The RC time constant of the filter is calculated by multiplying the capacitance of capacitor 150 by the resistance of resistor 152. This is the calculated value. The fault signal is then output to inverter 154, and inverter 154 The applied signal is inverted in order to output the fault signal 158 to the controller 160. Roller 160 monitors this signal and, if a fault condition exists for a specific period, takes action as necessary. The system can take appropriate measures. The measures taken by the controller 160 and Therefore, the operator of the surgical instrument 28 is warned via the display 34, power supply 8 To reduce the power output by 2, and / or to cut off power to the surgical instrument 28. These are some of the things that can be done.

[0082] The fault detection stage 144, the controller 160, and their components are described herein. As described herein, while still embodying the ability to detect leakage current faults, It may be different from what is listed.

[0083] Several embodiments have been discussed in the above description. However, the embodiments discussed herein are This invention is not intended to be exhaustive or to limit the present invention to any particular form. The terminology used is not restrictive, but rather inherent in the nature of descriptive words. It is intended to be a certain way. Many modifications and variations are possible in consideration of the above teachings, and the present invention This can be done in ways other than those specifically described.

[0084] Numerous features and advantages of the present invention are evident from the detailed specification, and therefore, the appendix is ​​attached. The claims of the invention include all such features of the invention that fall within the true spirit and scope of the invention. It is intended to extend to the advantages. Furthermore, to those skilled in the art, numerous modifications and variations can be easily conceived. Therefore, the present invention is not limited to the exact same configuration and operation as illustrated and described. It is undesirable to do so, and therefore all appropriate modifications and Equivalent materials may be used in some cases.

Claims

1. A control console that supplies drive signals to surgical instruments, A transformer comprising a primary winding and a secondary winding, wherein the primary winding receives an input signal from a power source. The secondary winding is configured to transmit the drive signal to the surgical instrument. A transformer configured to induce a drive signal, A first current source comprising a leakage control winding coupled to the path of the drive signal, the first The next winding is driven in the leakage control winding in such a manner that it cancels out the leakage current of the drive signal. A first canceling current is configured to be injected into the signal path, A current source and A sensor coupled to the path of the drive signal, wherein the feedback related to leakage current A sensor and are configured to output a detection signal to provide a check. A control console equipped with the following features.

2. The control console according to claim 1, wherein the power supply is a variable power supply.

3. The transformer and the first current source are integrated within a single package, claim 1 or The control console described in 2.

4. The first current source further comprises a capacitor coupled in series with the leakage control winding. A control console according to any one of claims 1 to 3.

5. The primary winding, the leakage control winding, and the secondary winding are collectively referred to as the leakage control winding. The configuration is such that capacitance is generated between the and the secondary winding, according to claims 1 to 4. Either of the control consoles described in item 1.

6. The drive signal is configured to drive an ultrasonic surgical instrument, according to claims 1 to 5. The control console described in any one of the items.

7. The drive signal is configured to drive a high-frequency surgical instrument, according to claims 1 to 6. The control console described in any one of the items.

8. The control console further includes a second current source configured to cancel out the leakage current. The second current source is provided, and is connected to the path of the drive signal and to the sensor. The control console according to any one of claims 1 to 7.

9. The control console according to claim 8, wherein the second current source is energized by the power supply.

10. The second current source is configured to receive the detection signal and the target value as inputs, and remaining Determine a second canceling current to be injected into the path of the drive signal to cancel out the residual leakage current. A control console according to claim 8 or 9, configured to set a fixed value.

11. The second current source comprises a gain device coupled to the sensor, and the gain device , to determine the difference between the detection signal and the target value, and based on the difference, the second phase A control console according to claim 10, configured to determine a kill current.

12. The second current source further comprises a capacitor coupled to the gain device, and the capacitor The sensor is configured to interrupt the DC component of the second canceling current, according to claim 11. The control console described.

13. The first and second current sources together reduce the leakage current to 10 μA or less. A control console according to any one of claims 8 to 12, configured to reduce Ru.

14. The sensor detects the current of the drive signal and uses the current of the drive signal as the detection signal. A control console according to any one of claims 1 to 13, configured to output Ru.

15. The sensor is configured to detect the common-mode current of the drive signal, and the drive signal The common-mode current is configured to be output as the detection signal, and the common The mode current is related to the leakage current of the drive signal, as described in any one of claims 1 to 14. Control console.

16. The path of the drive signal comprises a high-voltage side conductor and a low-voltage side conductor, and the sensor is front Further, the transformer windings arranged around both the high-voltage side conductor and the low-voltage side conductor are defined. The transformer winding is configured to output the common-mode current of the drive signal. The control console described in claim 14.

17. The control console is connected to the path of the drive signal and to the sensor. The system further comprises a current source, the second current source receiving the common-mode current and the target current as inputs. Inject the drive signal into the path so as to receive and to cancel out residual leakage current. It is configured to determine a second canceling current to be performed, and the second current source is the COMO Determine the difference between the current mode and the target current, and based on this difference, the second phase The control controller according to claim 16, comprising a gain device configured to determine the kill current. Sole.

18. The control console according to claim 17, wherein the target current is 0 amperes.

19. The path of the drive signal comprises a high-voltage side conductor and a low-voltage side conductor, and the sensor is front The low-voltage side conductor is coupled to the low-voltage side conductor, and the voltage from the low-voltage side conductor is detected. The following is configured to output as the detection signal, according to any one of claims 1 to 18 The control console described.

20. The sensor is a capacitor, according to any one of claims 1 to 19. Ru.

21. The control console further comprises a second current source coupled to the sensor, and the second current The current source is configured to receive the detected voltage and target voltage as inputs, and to control the residual leakage current. Determine a second canceling current to be injected into the path of the drive signal in order to cancel it out. The second current source is configured to determine the difference between the detected voltage and the target voltage. A gain device configured to determine the second cancellation current based on the difference The control console according to claim 19, comprising:

22. The second current source is configured to inject the second canceling current into the low-voltage side conductor. The control console according to claim 21.

23. The control console according to claim 21, wherein the target voltage is 0 volts.

24. The control console is coupled to the sensor and configured to receive the detection signal, It is configured to generate a fault detection signal for detecting fault conditions related to leakage current. A control console according to any one of claims 1 to 23, further comprising a fault detection stage. 。

25. The fault detection stage modifies the detection signal to generate the fault detection signal. The control according to claim 24, comprising a low-pass filter, a rectifier, and a filter configured as follows: Your console.

26. The control console is connected to the fault detection stage, and the fault detection signal is transmitted from the fault detection stage. It is configured to receive a signal and to determine the fault condition related to leakage current. The control console according to claim 24, further comprising a controller.

27. The fault detection stage detects the presence of the fault detection signal for a predetermined period, and the It is configured to transmit the fault detection signal to the controller when a predetermined period of time has been reached. A control console according to any one of claims 24 to 26.

28. The controller determines the fault state by comparing the fault detection signal with a target value. Furthermore, depending on the determination of the malfunction, the power to the surgical instrument may be reduced or interrupted. A control console according to any one of claims 24 to 27, configured to cut.

29. A control console that supplies drive signals to surgical instruments, A transformer comprising a primary winding and a secondary winding, wherein the primary winding receives an input signal from a power source. The secondary winding is configured to transmit the drive signal to the surgical instrument. A transformer configured to induce a drive signal, A first current source comprising a leakage control winding coupled to the path of the drive signal, the first The next winding is driven in the leakage control winding in such a manner that it cancels out the leakage current of the drive signal. A first canceling current is configured to be injected into the signal path, A current source and A detection signal is provided to detect the characteristics of the input signal and to detect the characteristics of the input signal. A sensor configured to output, A second current source coupled to the path of the drive signal, A variable gain device coupled to the sensor and the second current source, The second current source is coupled to the variable gain device, and a plurality of leakage current adjustment settings To enable one of the options, and to allow the selected leakage current adjustment setting to the variable A selection interface configured to provide to the device It is equipped with, The variable gain device is configured to receive the detection signal and the selected leakage It is configured to change the detection signal based on the current adjustment setting, The second current source, based on the modified detection signal from the variable gain device, To generate a second canceling current and to cancel out the leakage current of the drive signal, A control controller is configured to inject the second cancellation current into the aforementioned drive signal path. Sole.

30. The control console according to claim 29, wherein the second current source comprises a variable gain amplifier.

31. The control console according to any one of claims 29, wherein the sensor is a transformer winding.

32. The selection interface is a potentiometer, according to claim 29. Ru.

33. The potentiometer is a digital potentiometer controlled by software. The control console according to claim 32.

34. The aforementioned leakage current adjustment settings are stored in a lookup table in non-temporary memory. or the control console according to any one of claims 29 to 33.

35. The primary winding of the transformer is coupled to a variable power supply, as per any of claims 29 to 34. The control console described in item 1.

36. The control console according to claim 35, wherein the variable power supply also energizes the second current source. 。

37. A control console that supplies drive signals to surgical instruments, Variable power supply and A transformer comprising a primary winding and a secondary winding, wherein the primary winding is coupled to the variable power supply. The variable power supply is configured to receive an input signal, and the surgical instrument is configured to receive the drive signal. A transformer configured to induce a drive signal in the secondary winding to supply it. and, A current source coupled to the path of the drive signal and coupled to the variable power supply, The variable power supply is configured to energize the current source, and the current source controls the leakage current of the drive signal. The system is configured to generate a canceling current to be injected into the path of the drive signal in order to cancel it out. The current source and A control console equipped with the following features.

38. The control console further comprises a sensor coupled to the path of the drive signal, The sensor outputs a detection signal to provide feedback related to leakage current. A control console according to claim 37, configured as described above.

39. The control console according to claim 38, wherein the current source is coupled to the sensor.

40. The current source comprises a gain device coupled to the sensor, and the gain device is The system is configured to receive a detection signal and a target value as inputs, and to receive the detection signal and the target value It is configured to calculate the difference and to determine the offsetting current based on that difference. The control console according to claim 39.

41. The aforementioned control console is A detection signal is provided to detect the characteristics of the input signal and to detect the characteristics of the input signal. A sensor configured to output, A variable gain device coupled to the sensor and the current source, The current source is coupled to the variable gain device, and of a plurality of leakage current adjustment settings To enable one selection, and to set the selected leakage current adjustment setting to the variable gain device A selection interface configured to provide chairs and Furthermore, The variable gain device is configured to receive the detection signal and the selected leakage It is configured to change the detection signal based on the current adjustment setting, The current source is based on the modified detection signal from the variable gain device and the phase A control according to any one of claims 37 to 40, configured to generate a killing current. Your console.

42. The aforementioned variable power supply is variable within a defined range from 25VDC to 250VDC. a control console according to any one of claims 37 to 41.

43. The variable power supply energizes the supply source for the target value, and the variable power supply, in addition to the AC value, The configuration described in claim 40 is configured to provide the target value including the DC offset. Control console.

44. A method for operating a control console that supplies drive signals to surgical instruments, the control console The transformer comprises a primary winding and a secondary winding, wherein the secondary winding is the drive signal A transformer connected to the path of the drive signal, and a leakage control winding connected to the path of the drive signal. It comprises a first current source having and a sensor coupled to the path of the drive signal, The aforementioned method, The primary winding receives an input signal from the power supply, The steps include: inducing the drive signal in the secondary winding using the primary winding; The secondary winding provides the drive signal to the surgical instrument, The primary winding induces a first cancellation current in the leakage control winding. 、 The first current source injects the first canceling current into the path of the drive signal. Steps and The first canceling current cancels out the leakage current of the drive signal, The sensor outputs a detection signal to provide feedback related to leakage current. Steps to put power into A method that includes this.

45. A method for operating a control console that supplies drive signals to surgical instruments, the control The console is coupled to a transformer having a primary winding and a secondary winding, and to the path of the drive signal. A first current source equipped with a leakage control winding, a sensor, and the drive signal coupled to the path of the drive signal. A second current source, and a variable gain device connected to the sensor and coupled to the second current source. and comprising a selection interface coupled to the second current source and the variable gain device. The method described above is The primary winding receives an input signal from the power supply, The steps include: inducing the drive signal in the secondary winding using the primary winding; The secondary winding provides the drive signal to the surgical instrument, The primary winding induces a first cancellation current in the leakage control winding. 、 The first current source injects the first canceling current into the path of the drive signal. Steps and The steps include detecting the characteristics of the input signal using the aforementioned sensor, The sensor outputs a detection signal related to the characteristics of the input signal. 、 The aforementioned selection interface allows selection of one of several leakage current adjustment settings. The steps to take, The aforementioned selection interface allows the selected leakage current adjustment setting to be used by the variable gain device. Steps to provide to the chair, The steps include receiving the detection signal using the variable gain device, Based on the selected leakage current adjustment setting, the detection signal is transmitted by the variable gain device. Steps to change, The second current source, based on the modified detection signal from the variable gain device, The steps include generating a second canceling current, The second current source cancels out the leakage current of the drive signal. The steps include injecting the second canceling current into the path and A method that includes this.

46. A method for operating a control console that supplies drive signals to surgical instruments, the control The console comprises a variable power supply, a primary winding, and a secondary winding, the primary winding being connected to the variable power supply. The transformer is coupled to the path of the drive signal and is coupled to the variable power supply. The method comprises a current source and the method The primary winding receives an input signal from the variable power supply, The steps include: inducing the drive signal in the secondary winding using the primary winding; The secondary winding provides the drive signal to the surgical instrument, The steps include: supplying power to the current source using the variable power supply, The current source that has been energized cancels out the leakage current of the drive signal. The steps of generating a counteracting current to be injected into the aforementioned path and A method that includes this.

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