Pulse therapy system

Abstract

A pulse therapy system (1A) comprises: an intracanal electrode (30A) placed on an affected part of a subject; a counter electrode (40) placed on the body of the subject; a pulse current generation unit (12) that generates pulse current from current from a DC power supply unit (11) and supplies the pulse current to the intracanal electrode (30A) and the counter electrode (40); a power supply current monitoring unit (14) that monitors the current value of the current supplied to the pulse current generation unit (12); and a control unit (15) that controls the pulse current generation unit (12) on the basis of the current value to change a pulse current output.

Description

Pulse therapy system

[0001] This invention relates to a technique for treating a subject's dental treatment area using pulsed current.

[0002] In the field of dental treatment, electrosurgical units that use high-frequency currents are used for procedures such as incising, coagulating, and stopping bleeding of the gums. Additionally, devices are used to cauterize the dental pulp by passing a high-frequency current between an electrode inserted into the root canal and an electrode attached to the patient's body.

[0003] As a device for cauterizing dental pulp, a device has been proposed that controls the current value of the high-frequency current flowing through the electrode so that it remains within a predetermined range, in order to avoid being affected by the resistance caused by insulating films or deposits formed on the electrode surface (see Patent Document 1).

[0004] In such a device, a current detection unit is interposed between the electrode and the high-frequency signal generation circuit. The current value applied to the electrode is detected, and the high-frequency signal generation circuit is controlled based on this current value.

[0005] Japanese Patent Publication No. 2022-84238

[0006] However, in the apparatus described in Patent Document 1, in order to detect the current value of the high-frequency current with the current detection unit, it is necessary to extract a portion of the high-frequency current using components such as a current transformer and pass it through a rectifier circuit. As a result, a delay occurs due to capacitors and other components included in the rectifier circuit, and by the time the control of the high-frequency signal generation circuit based on the current value is to be started, the carbonization of the tissue has progressed further and the impedance has increased, which may prevent the execution of suitable treatment.

[0007] One possible method for detecting the current value of a high-frequency current in the current sensing unit is to convert the high-frequency current into Joule heat by passing it through a heating wire, measure the Joule heat using a thermocouple, and obtain the current value based on the measured temperature. However, with such a method, the circuit becomes complex and expensive, and a delay time occurs because the high-frequency current is converted into heat and the temperature is measured, making it impossible to quickly execute control when it is needed.

[0008] Furthermore, the apparatus described in Patent Document 1 can also control the voltage or duration of the high-frequency current based on the current value of the preliminary current supplied before treatment. However, in this case, since the current value is not used in real time, it is difficult to counteract rapid changes in impedance.

[0009] The present invention has been made in view of the above points, and aims to provide a pulse therapy system capable of rapidly controlling the output of pulsed current.

[0010] To solve the aforementioned problems, the pulse therapy system of the present invention comprises: an electrode placed on the affected area of ​​a subject; a counter electrode placed on the subject's body; a pulse current generation unit that generates a pulse current from a current from a power supply unit and supplies it to the electrode and the counter electrode; a power supply current monitoring unit that monitors the current value of the current supplied to the pulse current generation unit; and a control unit that changes the output of the pulse current by controlling the pulse current generation unit based on the current value.

[0011] According to the present invention, the output of pulsed current can be controlled quickly and at low cost.

[0012] This figure schematically shows a pulse therapy system according to the first embodiment of the present invention. This figure schematically shows an intracanal electrode and a counter electrode placed on a subject. (a) schematically shows a pulse current as a continuous wave, (b) schematically shows a pulse current as an intermittent wave, and (c) schematically shows a predetermined period during which the pulse current is applied. This figure schematically shows a state in which a pause period is set for the pulse current as an intermittent wave. (a) schematically shows a state in which the amplitude of the pulse current is changed, and (b) schematically shows the treatment state of the affected area for each amplitude. This figure schematically shows a method for extending the set period during which the pulse current is applied, and is a graph showing an example of the change in power over time. This figure schematically shows a pulse therapy system according to the second embodiment of the present invention, and schematically shows an intracanal electrode and a counter electrode placed on a subject. This figure schematically shows an example of the change in current value over time when treating the root apex and lateral canals. This figure schematically shows a pulse therapy system according to the third embodiment of the present invention, and is a schematic cross-sectional view showing an intracanal electrode. This diagram schematically shows a pulse therapy system according to a fourth embodiment of the present invention, and schematically shows a scalpel electrode and a counter electrode placed on a subject.

[0013] Embodiments of the present invention will be described in detail with reference to the drawings. In the following description, the same elements will be denoted by the same reference numerals, and redundant descriptions will be omitted. Directional indications in the drawings indicate the corresponding relationship between each drawing.

[0014] <First Embodiment> As shown in Figure 1, the pulse treatment system 1A according to the first embodiment of the present invention is a root canal treatment system for treating the root canal 2a of a tooth 2, which is the tooth to be examined by a subject, and the lateral branches 2b that extend from the root canal 2a to the periodontal ligament space 3. The pulse treatment system 1A uses pulsed current to treat the apex 2a1, which is the tip (bottom) of the root canal 2a, and to treat the lateral branches 2b.

[0015] The pulse therapy system 1A comprises a pulse therapy device 10, a transmission unit 20, an intra-root canal electrode 30A, a counter electrode 40, and a stopper 50.

[0016] <Pulse Therapy Device> The pulse therapy device 10 comprises a DC power supply unit 11, a pulse current generation unit 12, a power supply current monitoring unit 14, a control unit 15, a first operation unit 16, and a second operation unit 17.

[0017] ≪DC Power Supply Unit≫ The DC power supply unit 11 is a constant voltage power supply that controls the output voltage to a constant value, and is a power supply circuit that generates a DC current (power supply current) for generating pulse current. The generated DC current is supplied to the pulse current generation unit 12.

[0018] <Pulse Current Generation Unit> The pulse current generation unit 12 is a circuit that generates pulse current (in this embodiment, a high-frequency current with a frequency of 200 kHz to 5 MHz) from the DC current supplied from the DC power supply unit 11. The pulse current generation unit 12 comprises a pulse switch circuit 12a, an output transformer 12b, a capacitor 12c, and a waveform generation unit 13.

[0019] The pulse switch circuit 12a is electrically connected to the DC power supply unit 11. Based on the waveform generated by the waveform generation unit 13, the pulse switch circuit 12a converts the DC current from the DC power supply unit 11 into a pulse current. The converted pulse current is transmitted to the output transformer 12b.

[0020] The output transformer 12b converts the pulse current generated by the pulse switch circuit 12a using the load impedance of the output transformer 12b, and transmits the converted pulse current to the capacitor 12c. The output characteristics of the capacitor 12c are specific to the device, and are set so that the power of the pulse current supplied to the root canal electrode 30A and the counter electrode 40 is maximized when these output characteristics are matched with the load impedance of the living body (which varies depending on the part of the body and takes values ​​in the range of 100Ω to 2kΩ).

[0021] The capacitor 12c cuts the low-frequency components of the pulse current generated by the pulse switch circuit 12a and determines the output impedance of the capacitor 12c (when the output impedance matches the impedance of the capacitor 12c, the power supplied to and consumed by the intracanal electrode 30A and the counter electrode 40 becomes maximum). The pulse current with the low-frequency components cut is applied to the intracanal electrode 30A and the counter electrode 40.

[0022] ≪Waveform generation unit≫ The waveform generation unit 13 is a circuit unit that generates a waveform for a pulse current based on a control signal from the control unit 15. The generated waveform is transmitted to the pulse switch circuit 12a. The waveform generation unit 13 is configured to be able to selectively generate either a continuous wave or an intermittent wave. The waveform generation unit 13 includes a continuous wave generation unit 13a, an intermittent wave generation unit 13b, a first switch 13c, and a second switch 13d.

[0023] The continuous wave generation unit 13a generates a continuous wave based on a control signal from the control unit 15 (see Fig. 3(a)).

[0024] The intermittent wave generation unit 13b generates an intermittent wave based on a control signal from the control unit 15 (see Fig. 3(b)).

[0025] The first switch 13c is provided between the continuous wave generation unit 13a and the intermittent wave generation unit 13b and the second switch 13d. The first switch 13c is configured to be able to switch between the following two states based on a control signal from the control unit 15. Continuous wave transmission state: A state in which the connection between the continuous wave generation unit 13a and the second switch 13d is established and the connection between the intermittent wave generation unit 13b and the second switch 13d is cut off. Intermittent wave transmission state: A state in which the connection between the continuous wave generation unit 13a and the second switch 13d is cut off and the connection between the intermittent wave generation unit 13b and the second switch 13d is established.

[0026] The second switch 13d is interposed between the first switch 13c and the pulse switch circuit 12a. The second switch 13d is configured to be switchable between the following two states based on a control signal from the control unit 15. Connection state: A state in which the first switch 13c and the pulse switch circuit 12a are connected. Disconnection state: A state in which the connection between the first switch 13c and the pulse switch circuit 12a is disconnected.

[0027] ≪Power current monitoring unit≫ The power current monitoring unit 14 is interposed in a closed circuit that connects the DC power supply unit 11 and the pulse switch circuit 12a of the pulse current generation unit 12 to each other, and monitors the current value of the DC current (power current) supplied by the DC power supply unit 11. The monitored current value is output to the control unit 15. The power current monitoring unit 14 includes a resistor 14a and an operational amplifier 14b.

[0028] The resistor 14a is interposed between the DC power supply unit 11 and the pulse switch circuit 12a.

[0029] The operational amplifier 14b is connected in parallel to the resistor 14a, and detects the current value of the current flowing through the resistor 14a. The detected current value is output to the control unit 15.

[0030] <Control unit> The control unit 15 is composed of a CPU (Central Processing Unit), a ROM (Read-Only Memory), a RAM (Random Access Memory), an input / output circuit, etc., and changes the output of the pulse current by controlling the waveform generation unit 13 based on the operation result of the first operation unit 16, the operation result of the second operation unit 17, and the monitoring result (current value) of the power current monitoring unit 14.

[0031] ≪First operation unit≫ The first operation unit 16 is composed of a keyboard, a mouse, a touch panel, a dial, etc. The operation result of the first operation unit 16 is output to the control unit 15.

[0032] ≪Second Operation Unit≫ The second operation unit 17 is composed of a foot pedal or the like. The operation result of the second operation unit 17 is output to the control unit 15. Note that the foot pedal serving as the second operation unit 17 may be one provided in a dental treatment unit.

[0033] <Transmission Unit> The transmission unit 20 transmits the pulsed current supplied from the pulsed treatment device 10 to the root canal electrode 30A and the counter electrode 40. In this embodiment, the transmission unit 20 is a wire that carries power as a pulsed current and constitutes a series circuit that supplies power from the pulsed treatment device 10 to the root canal electrode 30A and the counter electrode 40.

[0034] <<Intra-root canal electrode>> As shown in Figure 2, the intra-root canal electrode 30A is placed inside the root canal 2a of the tooth 2, which is the affected area. The intra-root canal electrode 30A comprises an electrode body 31, an insulating part 32, and a gripping part 33.

[0035] The electrode body 31 is a long, slender, roughly rod-shaped electrode that is inserted into the root canal 2a of the subject's tooth 2 so as to conduct electricity to the inner surface of the root canal 2a (for example, in contact with the pulp of the root canal 2a, or, if pulpectomy has been performed, with respect to the inner surface other than the pulp). The electrode body 31 is made of a conductive material (for example, a conductive metal such as stainless steel, nickel-titanium, or tungsten). The electrode body 31 has a tip diameter of 0.1 mm to 2 mm and possesses flexibility to accommodate curved root canals 2a.

[0036] The tip of the electrode body 31 may be conical or hemispherical in shape. Such a structure can improve access to the root canal 2a.

[0037] The insulating portion 32 covers and insulates the electrode body 31 while exposing a portion of it in the axial direction (in this embodiment, the tip). That is, in the root canal electrode 30A, the portion of the electrode body 31 exposed from the insulating portion 32 is the conductive region X1 that can conduct electricity to the affected area of ​​the subject, and the portion of the electrode body 31 covered by the insulating portion 32 is the insulated region X2 that cannot conduct electricity to the affected area of ​​the subject. Setting the conductive region X1 in this way enables concentrated current flow to the root apex 2a1, allowing for suitable treatment of the root apex 2a1. In this embodiment, the insulating portion 32 is formed by a coating using an insulating material. Alternatively, the insulating portion 32 may be a cover formed by an insulating material, as in the insulating portion 34 of the third embodiment described later.

[0038] The gripping portion 33 is attached to the base end of the electrode body 31 and is the part that is gripped by the operator (dentist, dental hygienist, dental assistant, etc.). The gripping portion 33 is made of an insulating material.

[0039] <Counter Electrode> The counter electrode 40 is a rod-shaped or plate-shaped electrode that is attached to the subject's body (e.g., gums 4) in a electrically conductive manner (e.g., in contact with the body). The counter electrode 40 is made of a conductive material (e.g., a conductive metal such as stainless steel, nickel-titanium, or tungsten). The counter electrode 40 may be a counter electrode plate attached to the gums 4, an electrical connection terminal such as a mouth corner clip that is hooked onto the gums 4, an alligator clip attached to the subject's body, an electrode held by the subject, or a conductive metal saliva ejector placed at the corner of the mouth. In other words, the shape of the counter electrode 40 is not limited to a plate shape, but may be rod-shaped, spherical, etc. Furthermore, the mounting position of the counter electrode 40 is not limited to the gums 4, which are the inner surface of the oral cavity, but may be any part of the subject's body such as the lips, inner surface of the oral cavity, hand, or skin. In addition, the counter electrode 40 may also be grounded to a seat (examination table) on which the subject sits.

[0040] Here, the root canal electrode 30A and the counter electrode 40 are configured to be detachable (replaceable) from the transmission unit 20. Alternatively, the transmission unit 20 is configured to be detachable (replaceable) from the pulse treatment device 10.

[0041] <Stopper> The stopper 50 is a plate-shaped member positioned at the occlusal end of the tooth 2 (the tip of the occlusal surface; the lower end of the upper tooth, the upper end of the lower tooth) and fixes the intracanal electrode 30A, which is inserted into the root canal 2a, to a desired insertion depth. The stopper 50 is made of, for example, rubber material. The intracanal electrode 30A is press-fitted into the hole of the stopper 50 so that it can move (slide) in the axial direction of the intracanal electrode 30A.

[0042] The stopper 50, by contacting the occlusal end of the tooth 2, becomes the reference position for measuring the root canal length, which is the length of the root canal 2a. That is, the operator places the stopper 50 against the occlusal end of the tooth 2 when the apical position detection unit 16a detects that the tip of the intracanal electrode 30A is located at the root apex 2a1. Subsequently, the operator removes the intracanal electrode 30A and stopper 50 in this state from the subject's oral cavity and measures the distance from the stopper 50 to the tip of the intracanal electrode 30A, thereby measuring the root canal length. The operator can also measure the position of the lateral canal 2b (the distance from the occlusal end of the tooth 2 to the connection point of the lateral canal 2b) using the same method.

[0043] <Operation Example> Next, an operation example of the pulse therapy system 1A according to the first embodiment of the present invention will be described. In the following operation example, the power supply current monitoring unit 14 is supplied with a predetermined required voltage (i.e., a constant voltage) from the DC power supply unit 11.

[0044] The control unit 15 controls the pulse current generation unit 12 to generate a pulse current when the second operation unit 17 is being operated, and to stop the pulse current when the operation of the second operation unit 17 is stopped. Furthermore, the control unit 15 controls the pulse current generation unit 12 for a predetermined period T after the second operation unit 17 has been operated once. ５ The configuration may also be one that continuously generates pulsed current during the period shown in Figure 3(c).

[0045] When a pulsed current is applied to the affected area of ​​the subject (dental treatment site, in this embodiment, the root apex 2a1 and / or lateral branch 2b within the root canal 2a), the current value monitored by the power supply current monitoring unit 14 rises in the initial stages of application when the impedance of the affected area is low, because a large amount of power is consumed between the electrode (in this embodiment, the intra-root canal electrode 30A) and the counter electrode 40. Subsequently, the current value monitored by the power supply current monitoring unit 14 decreases as the tissue carbonizes and the impedance increases. Based on this decrease in current value (based on the decrease in power supplied to the subject), the control unit 15 terminates or modifies the treatment.

[0046] The control unit 15 calculates an initial value of the current value monitored by the power supply current monitoring unit 14 at the start of pulse current output (for example, the average value for 0.1 seconds from the start of output), and sets a predetermined percentage of this initial value (for example, 1 / 2) as the predetermined value of the current value described later. Alternatively, the control unit 15 may be configured to calculate the peak value of the current value monitored by the power supply current monitoring unit 14, and set a predetermined percentage of this peak value (for example, 70%) as the predetermined value of the current value described later. Here, the control unit 15 sets the predetermined percentage based on the results of the operator's prior operation of the first operation unit 16.

[0047] Such examples of operation are applicable to the pulse therapy system 1B (see Figure 7) and the pulse therapy system 1C (see Figure 9) according to the second embodiment, which will be described later. Furthermore, such examples of operation are also applicable to the pulse therapy system 1D (see Figure 10) according to the fourth embodiment, which will be described later. In this case, a scalpel electrode 30D is used as the electrode, and soft tissue (gingiva 4) is treated as the affected area.

[0048] <Control Example: Continuous Wave Interruption> The control unit 15 sets the first switch 13c to a continuous wave transmission state and the second switch 13d to a connected state, causing the continuous wave generation unit 13a to generate a continuous wave. In this state, the pulse current (see Figure 3(a)) as a continuous wave generated by the pulse switch circuit 12a is applied to the root canal electrode 30A and the counter electrode 40 via the output transformer 12b, capacitor 12c, and transmission unit 20.

[0049] The pulse treatment system 1A treats the inside of the root canal 2a by applying such pulsed current (incision, sterilization, etc., mainly sterilization in this embodiment). As the treatment inside the root canal 2a progresses and the tissue carbonizes, the power supplied to the subject is limited, and the value of the power supplied to the pulse switch circuit 12a decreases.

[0050] When the current value monitored by the power supply current monitoring unit 14 falls below a predetermined value, the control unit 15 switches the second switch 13d from the connected state to the disconnected state. This allows the pulse therapy system 1A to terminate the treatment appropriately.

[0051] Such examples of operation are applicable to the pulse therapy system 1B (see Figure 7) and the pulse therapy system 1C (see Figure 9) according to the second embodiment, which will be described later. Furthermore, such examples of operation are also applicable to the pulse therapy system 1D (see Figure 10) according to the fourth embodiment, which will be described later. In this case, a scalpel electrode 30D is used as the electrode, and soft tissue (gingiva 4) is treated as the affected area.

[0052] <Control Example: Continuous Wave Output Reduction> The control unit 15 can also switch the first switch 13c from a continuous wave transmission state to an intermittent wave transmission state when the current value monitored by the power supply current monitoring unit 14 falls below a predetermined value. In this state, the pulse current as a continuous wave generated by the pulse switch circuit 12a (see Figure 3(b)) is applied to the electrode (in this embodiment, the root canal electrode 30A) and the counter electrode 40 via the output transformer 12b, capacitor 12c, and transmission unit 20. As a result, the pulse treatment system 1A can suitably protect the tissue of the affected area (in this embodiment, inside the root canal 2a) (e.g., reduce temperature rise).

[0053] The operator stops operating the second control unit 17 while visually inspecting the affected area to confirm the optimal condition. As a result, the control unit 15 switches the second switch 13d from the connected state to the disconnected state.

[0054] Such examples of operation are applicable to the pulse therapy system 1B (see Figure 7) and the pulse therapy system 1C (see Figure 9) according to the second embodiment, which will be described later. Furthermore, such examples of operation are also applicable to the pulse therapy system 1D (see Figure 10) according to the fourth embodiment, which will be described later. In this case, a scalpel electrode 30D is used as the electrode, and soft tissue (gingiva 4) is treated as the affected area.

[0055] <Control Example: Intermittent Wave Interruption> The control unit 15 sets the first switch 13c to the intermittent wave transmission state and the second switch 13d to the connected state, causing the intermittent wave generation unit 13b to generate an intermittent wave. In this state, the pulse current (see Figure 3(b)) as an intermittent wave generated by the pulse switch circuit 12a is applied to the electrode (in this embodiment, the root canal electrode 30A) and the counter electrode 40 via the output transformer 12b, capacitor 12c, and transmission unit 20.

[0056] The pulse therapy system 1A treats the affected area (in this embodiment, the inside of the root canal 2a) by applying such pulsed current (hemostasis, coagulation, prevention of temperature rise, etc.). As the treatment progresses and the tissue of the affected area carbonizes, the power supplied to the subject is limited, and the value of the power supplied to the pulse switch circuit 12a decreases.

[0057] When the current value monitored by the power supply current monitoring unit 14 falls below a predetermined value, the control unit 15 switches the second switch 13d from the connected state to the disconnected state. This allows the pulse therapy system 1A to terminate the treatment appropriately.

[0058] Such examples of operation are applicable to the pulse therapy system 1B (see Figure 7) and the pulse therapy system 1C (see Figure 9) according to the second embodiment, which will be described later. Furthermore, such examples of operation are also applicable to the pulse therapy system 1D (see Figure 10) according to the fourth embodiment, which will be described later. In this case, a scalpel electrode 30D is used as the electrode, and soft tissue (gingiva 4) is treated as the affected area.

[0059] <Control Example: Reduction of Output of Intermittent Wave Part 1> Also, when the current value monitored by the power supply current monitoring unit 14 becomes equal to or less than a predetermined value, the control unit 15 reduces the duty ratio (T １ / (T １ + T ２ )) of the intermittent wave generated by the intermittent wave generation unit 13b. Here, the duty ratio is determined by the on-period T ３ within the pulse width (period T １ and the off-period T ２ . In such a state, a pulse current (see Fig. 3(b)) as an intermittent wave with a small duty ratio generated by the pulse switch circuit 12a is applied to the electrode (in this embodiment, the root canal electrode 30A) and the counter electrode 40 via the output transformer 12b, the capacitor 12c, and the transmission unit 20. Thereby, the pulse treatment system 1A can suitably protect the tissue of the affected part (in this embodiment, within the root="

[0060] The operator stops the operation of the second operation unit 17 while visually checking the affected part to confirm the optimal situation. As a result, the control unit 15 switches the second switch 13d from the connected state to the disconnected state.

[0061] Such an operation example is applicable to the pulse treatment system 1B (see Fig. 7) according to the second embodiment and the pulse treatment system 1C (see Fig. 9) according to the third embodiment described later. Also, such an operation example is applicable to the pulse treatment system 1D (see Fig. 10) according to the fourth embodiment described later. In this case, the scalpel electrode 30D is used as the electrode, and the soft tissue (gum 4) is treated as the treatment site.

[0062] <Control Example: Reduction of Output of Intermittent Wave Part 2> Also, when the current value monitored by the power supply current monitoring unit 14 becomes equal to or less than a predetermined value, the control unit 15 sets a pause period T ３ between sets of a plurality of adjacent pulse widths for each of the plurality of pulse widths (period T ４ ) of the intermittent wave generated by the intermittent wave generation unit 13b. In such a state, the pause period T ４A pulsed current (see Figure 4) having the characteristics of an intermittent wave is applied to the electrode (in this embodiment, the root canal electrode 30A) and the counter electrode 40 via the output transformer 12b, capacitor 12c, and transmission unit 20. As a result, the pulsed treatment system 1A can suitably protect the tissue of the affected area (in this embodiment, inside the root canal 2a) (e.g., reduce temperature rise).

[0063] The operator stops operating the second control unit 17 while visually inspecting the affected area to confirm the optimal condition. As a result, the control unit 15 switches the second switch 13d from the connected state to the disconnected state.

[0064] The control unit 15, based on the results of the operator's prior operation of the first operating unit 16, determines the pause period T ４ It is possible to set a pause period T. ４ For example, the off-period T of the duty cycle. ２ Longer is preferable.

[0065] Such examples of operation are applicable to the pulse therapy system 1B (see Figure 7) and the pulse therapy system 1C (see Figure 9) according to the second embodiment, which will be described later. Furthermore, such examples of operation are also applicable to the pulse therapy system 1D (see Figure 10) according to the fourth embodiment, which will be described later. In this case, a scalpel electrode 30D is used as the electrode, and soft tissue (gingiva 4) is treated as the affected area.

[0066] <Control Example: Stopping Pulse Current Output> Furthermore, the control unit 15 will stop outputting pulse current if the current value monitored by the power supply current monitoring unit 14 is greater than a predetermined value for a predetermined period of time T. ５ (See Figure 3(c)) If the treatment continues, the second switch 13d is switched from the connected state to the disconnected state. This allows the pulse treatment system 1A to suitably protect the tissue in the affected area (in this embodiment, inside the root canal 2a).

[0067] The control unit 15, based on the results of the operator's prior operation of the first operating unit 16, performs the operation for a predetermined period T ５ It is possible to set a predetermined period T. ５ For example, multiple pulse widths (period T) ３This can be set to the same period as or longer than the first period. The operator can restart the treatment using pulsed current by operating the second control unit 17 again.

[0068] Such examples of operation are applicable to the pulse therapy system 1B (see Figure 7) and the pulse therapy system 1C (see Figure 9) according to the second embodiment, which will be described later. Furthermore, such examples of operation are also applicable to the pulse therapy system 1D (see Figure 10) according to the fourth embodiment, which will be described later. In this case, a scalpel electrode 30D is used as the electrode, and soft tissue (gingiva 4) is treated as the affected area.

[0069] <Control Example: Reduction of Pulse Current Output> Furthermore, when the current value monitored by the power supply current monitoring unit 14 falls below a predetermined value, the control unit 15 can reduce the amplitude of the continuous wave generated by the continuous wave generation unit 13a or the intermittent wave generated by the intermittent wave generation unit 13b. Here, the smaller the amplitude (current value or voltage value) of the high-frequency signal (see Figure 5(a)), the smaller the surface charring Y1 and lateral thermal denaturation Y2 as the treatment state of the affected area become (see Figure 5(b)). As a result, the pulse treatment system 1A can suitably protect the tissue of the affected area (in this embodiment, inside the root canal 2a) (reduction of hemostatic effect, reduction of coagulation and hardening, etc.).

[0070] The operator stops operating the second control unit 17 while visually inspecting the affected area to confirm the optimal condition. As a result, the control unit 15 switches the second switch 13d from the connected state to the disconnected state.

[0071] The control unit 15 can set the amplitude reduction ratio based on the results of the operator's prior operation of the first operating unit 16.

[0072] Such examples of operation are applicable to the pulse therapy system 1B (see Figure 7) and the pulse therapy system 1C (see Figure 9) according to the second embodiment, which will be described later. Furthermore, such examples of operation are also applicable to the pulse therapy system 1D (see Figure 10) according to the fourth embodiment, which will be described later. In this case, a scalpel electrode 30D is used as the electrode, and soft tissue (gingiva 4) is treated as the treatment site.

[0073] <Example of operation: Extension of pulse current output> The control unit 15 also receives a set power W corresponding to a preset set period T, and the supplied power W supplied to the root canal electrode 30A and the counter electrode 40 during the set period T. Ｓ The following is compared. Here, the set period T is the power W supplied to the root canal electrode 30A and the counter electrode 40. Ｓ This is the time during which it is supplied, for example, period T. ３ , T ５ Furthermore, the control unit 15 monitors the voltage (constant voltage) of the DC power supply unit 11, the current value monitored by the power supply current monitoring unit 14, and the supplied power W. Ｓ Based on the time the power was supplied, the amount of power supplied to the root canal electrode 30A and the counter electrode 40 can be calculated.

[0074] Under normal circumstances, the pulse current generation unit 12 supplies a set power W to the root canal electrode 30A and the counter electrode 40 during the set period T (line L in Figure 6). １ (See reference). On the other hand, when the current value of the DC current generated by the DC power supply unit 11 is relatively small, the supply power W supplied by the pulse current generation unit 12 to the root canal electrode 30A and the counter electrode 40 during the set period T is Ｓ This becomes smaller than the set power W (line L in Figure 6). ２ reference).

[0075] Thus, the supplied power W during the set period T Ｓ If the current is less than the set power W, the control unit 15 controls the pulse current generation unit 12 so that the output time of the pulse current is longer as the current value decreases. Here, the control unit 15 pre-sets the set period T and the set power W based on the results of the operator's prior operation of the first operation unit 16 (for example, a dial).

[0076] The control unit 15 receives the supplied power W during the set period T. Ｓ When the set power W is less than the supplied power W, the supplied power W Ｓ The extension period ΔT of the pulse current output is calculated based on the set power W. ΔT = (W - W) Ｓ ) T / W ＳThe control unit 15 controls the pulse current generation unit 12 to output a pulse current for a period equal to the set period T plus an extension period ΔT, thereby supplying power W to the root canal electrode 30A and the counter electrode 40. Ｓ The system supplies a predetermined amount of energy (the product of the set power W and the set period T) to the affected area, thereby enabling suitable treatment. The set period T may be set in advance before supplying power to the root canal electrode 30A and the counter electrode 40, or it may be set to correspond to the actual power supply period to the root canal electrode 30A and the counter electrode 40, that is, the period of operation by the operator for power supply.

[0077] ≪Operation Example: When the set power and set period are set in advance≫ The control unit 15 sets the set power W and set period T based on the results of the operator's prior operation of the first operation unit 16 (for example, a dial). In this operation example, the operator operates the second operation unit 17 once (presses the foot pedal once). Based on this operation, the control unit 15 supplies the set power W to the root canal electrode 30A and the counter electrode 40 for the set period T. The control unit 15 then sets the actual supplied power W Ｓ If the power is less than the set power W, the extension period ΔT is calculated, and the power supply period is extended by the amount of the extension period ΔT.

[0078] ≪Operation Example: When the set power is set in advance≫ The control unit 15 sets the set power W based on the results of the operator's prior operation of the first operating unit 16 (for example, a dial). In this operation example, the operator continues to operate the second operating unit 17 (continues to press the foot pedal). Based on this operation, the control unit 15 supplies the set power W to the root canal electrode 30A and the counter electrode 40 while the second operating unit 17 is being operated. When the operator finishes operating the second operating unit 17, the control unit 15 sets the power supply period, i.e., the operating period of the second operating unit 17, as the set period T. The control unit 15 sets the actual supplied power W Ｓ If the power is less than the set power W, the extension period ΔT is calculated, and the power supply period is extended by the amount of the extension period ΔT.

[0079] In this embodiment, when the DC power supply unit 11 is a constant voltage power supply, the control unit 15 sets the set power W and the supplied power W Ｓ Instead of comparing the power supply W with the current value, the set current value, which is the set power W divided by a constant voltage, can be compared with the current value monitored by the power supply current monitoring unit 14. That is, if the current value monitored by the power supply current monitoring unit 14 is smaller than the preset set current value, the control unit 15 controls the pulse current generation unit 12 so that the output time of the pulse current can be increased as the current value decreases. Here, the control unit 15 sets the set current value based on the results of prior operation of the first operation unit 16 (for example, a dial) by the operator. As a result, the pulse therapy system 1A can monitor the load on the subject (fluctuation in the current value) and compensate for the decrease in power by extending the output time of the pulse current in accordance with the decrease in the current value (decrease in power consumed at the affected area due to an increase in the load resistance of the living body).

[0080] Furthermore, the control unit 15 may be configured to control the pulse current generation unit 12 so as to stop outputting the pulse current when the amount of power supplied to the root canal electrode 30A and the counter electrode 40 within the set period T reaches the amount of power which is the product of the set power W and the set period T.

[0081] Such examples of operation are applicable to the pulse therapy system 1B (see Figure 7) and the pulse therapy system 1C (see Figure 9) according to the second embodiment, which will be described later. Furthermore, such examples of operation are also applicable to the pulse therapy system 1D (see Figure 10) according to the fourth embodiment, which will be described later. In this case, a scalpel electrode 30D is used as the electrode, and soft tissue (gingiva 4) is treated as the affected area.

[0082] <Operation Example: Pulse Treatment (Apical Treatment)> This operation example describes the treatment of the root apex 2a1 using an intra-root canal electrode 30A, in which the current-conducting region X1 is provided at the tip of the electrode body 31. The operator operates the second control unit 17 to start pulse treatment. The control unit 15 sets the first switch 13c to the continuous wave transmission state and the second switch 13d to the connected state. In this state, the control unit 15 causes the continuous wave generation unit 13a to generate a continuous wave. The generated continuous wave is input to the pulse switch circuit 12a via the first switch 13c and the second switch 13d. The pulse switch circuit 12a generates a pulse current from a DC current by repeatedly switching ON and OFF based on the input continuous wave. The generated pulse current is applied to the intra-root canal electrode 30A and the counter electrode 40 via the output transformer 12b, capacitor 12c, and transmission unit 20. The pulsed treatment system 1A treats the root apex 2a1 by applying a pulsed current as a continuous wave to the root canal electrode 30A and the counter electrode 40.

[0083] Here, the control unit 15 detects a decrease in the peak value of the current monitored by the power supply current monitoring unit 14. The first decrease in the peak value of the current indicates that treatment of the root apex 2a1 has been completed.

[0084] When the control unit 15 detects the first decrease in the peak value of the current (for example, when the current value falls below a predetermined percentage of the peak value (for example, 70%)), it switches the second switch 13d from the connected state to the disconnected state. This allows the pulse treatment system 1A to suitably terminate the treatment of the root apex 2a1.

[0085] A pulse therapy system 1A according to the first embodiment of the present invention comprises an electrode (root canal electrode 30A) placed on the affected area of ​​a subject, a counter electrode 40 placed on the subject's body, a pulse current generation unit 12 that generates a pulse current from a current from a power supply unit (DC power supply unit 11) and supplies it to the electrode and the counter electrode 40, a power supply current monitoring unit 14 that monitors the current value of the current supplied to the pulse current generation unit 12, and a control unit 15 that changes the output of the pulse current by controlling the pulse current generation unit 12 based on the current value. Therefore, the pulse therapy system 1A can quickly monitor changes in the pulse power value (changes in impedance) flowing to the subject by monitoring the power supply current, prevent delays until control starts, and quickly control the output of the pulse current. Furthermore, since the pulse therapy system 1A does not require a rectifier circuit or the like between the power supply current monitoring unit 14 and the control unit 15, it can achieve cost reduction.

[0086] In the pulse therapy system 1A, the pulse current generation unit 12 is configured to generate continuous waves and intermittent waves as pulse currents. Therefore, the pulse therapy system 1A can suitably perform treatments such as incision and sterilization using continuous waves, and hemostasis, coagulation, temperature rise prevention, and sterilization using intermittent waves.

[0087] In the pulsed treatment system 1A, the electrode is an intra-root canal electrode 30A placed inside the root canal 2a of the tooth 2, which is the affected area. Therefore, the pulsed treatment system 1A can effectively treat the inside of the root canal 2a.

[0088] In the root canal electrode 30A of the pulse treatment system 1A, a portion in the axial direction is a current-conducting region X1, and the other portion in the axial direction is an insulating region X2. Therefore, the pulse treatment system 1A can suitably treat a desired region within the root canal 2a.

[0089] In the pulse therapy system 1A, the control unit 15 stops or reduces the output of the pulse current when the current value is below a predetermined value. Therefore, the pulse therapy system 1A can suitably terminate or reduce the treatment of the affected area (in this embodiment, inside the root canal 2a).

[0090] In the pulse therapy system 1A, the control unit 15 reduces the output of the pulse current by switching the pulse current from a continuous wave to an intermittent wave when the current value is less than or equal to the predetermined value. Therefore, the pulse therapy system 1A can effectively reduce the treatment of the affected area (in this embodiment, inside the root canal 2a).

[0091] In the pulse therapy system 1A, the control unit 15 reduces the duty cycle of the intermittent pulse current when the current value is less than or equal to the predetermined value, or sets a pause period T for each of the multiple pulse widths of the intermittent pulse current. ４ By setting this, the output of the pulse current is reduced. Therefore, the pulse treatment system 1A can suitably reduce the treatment of the affected area (in this embodiment, inside the root canal 2a).

[0092] In the pulse therapy system 1A, the control unit 15 reduces the amplitude of the pulse current when the current value is less than or equal to the predetermined value. Therefore, the pulse therapy system 1A can effectively reduce the treatment of the affected area (in this embodiment, inside the root canal 2a).

[0093] In the pulse therapy system 1A, the control unit 15 determines that the current value is greater than a predetermined value for a predetermined period T. ５ If this continues, the output of the pulsed current is stopped. Therefore, the pulse therapy system 1A can prevent excessive continuous application of pulsed current.

[0094] In the pulsed treatment system 1A, the energizing region X1 is located at the tip or middle of the root canal electrode 30A in the axial direction, and the control unit 15 stops outputting the pulsed current when it detects the first decrease in the peak value of the current. Therefore, the pulsed treatment system 1A can suitably treat the affected area (for example, one of the root apex 2a1 and the lateral branch 2b) according to the position of the energizing region X1.

[0095] The power supply unit is a constant voltage power supply, and the control unit 15 controls the pulse current generation unit 12 such that the output time of the pulse current increases as the current value decreases when the current value is smaller. Therefore, the pulse therapy system 1A can suppress the decrease in the amount of power supplied to the affected area and realize suitable treatment.

[0096] <Second Embodiment> Next, the pulse therapy system according to the second embodiment of the present invention will be described, focusing on the differences from the pulse therapy system 1A according to the first embodiment. As shown in Figure 7, the pulse therapy system 1B according to the second embodiment of the present invention is equipped with an intra-root canal electrode 30B instead of intra-root canal electrode 30A.

[0097] <Intracanal Electrode> In the intracanal electrode 30B, the insulating portion 32 covers and insulates the other axial portions (including the tip) of the electrode body 31, leaving the axial middle portion exposed. That is, in the intracanal electrode 30B, the current-carrying region X1 is provided at a position corresponding to the lateral canal 2b. For example, the current-carrying region X1 can be set with a width of approximately 3 mm in the axial direction, starting from a distance of 2 mm to 3 mm in the axial direction from the tip of the electrode body 31. Setting the current-carrying region X1 in this way enables concentrated current flow to the lateral canal 2b, allowing for appropriate treatment of the lateral canal 2b. Setting the insulating region X2 in this way reduces current flow to the root apex 2a1, allowing for protection of the root apex 2a1.

[0098] <Operation Example> Next, we will explain an operation example of the pulse therapy system 1B according to the second embodiment of the present invention, focusing on the differences from the operation example of the pulse therapy system 1A according to the first embodiment.

[0099] <Operation Example: Pulse Treatment (Lateral Canal Treatment)> This operation example describes the treatment of a lateral canal 2b using an intra-root canal electrode 30B whose current-conducting region X1 is located in the axial middle part of the electrode body 31. The operator operates the second control unit 17 to start pulse treatment. The control unit 15 sets the first switch 13c to the continuous wave transmission state and the second switch 13d to the connected state. In this state, the control unit 15 causes the continuous wave generation unit 13a to generate a continuous wave. The generated continuous wave is input to the pulse switch circuit 12a via the first switch 13c and the second switch 13d. The pulse switch circuit 12a generates a pulse current from a DC current by repeatedly switching ON / OFF based on the input continuous wave. The generated pulse current is applied to the intra-root canal electrode 30A and the counter electrode 40 via the output transformer 12b, capacitor 12c and transmission unit 20. The pulsed treatment system 1A treats the lateral canal 2b while protecting the root apex 2a1 by applying a pulsed current as a continuous wave to the root canal electrode 30A and the counter electrode 40.

[0100] Here, the control unit 15 detects a decrease in the peak value of the current monitored by the power supply current monitoring unit 14. The first decrease in the peak value of the current indicates that treatment of the side branch 2b has been completed.

[0101] When the control unit 15 detects the first decrease in the peak value of the current (i.e., when it detects that the current value has decreased due to degeneration of the tissue of the lateral branch 2b), it switches the second switch 13d from the connected state to the disconnected state. This allows the pulse therapy system 1A to suitably terminate the treatment of the lateral branch 2b.

[0102] Such examples of operation are applicable to the pulse therapy system 1C (see Figure 9) according to the third embodiment described later.

[0103] <Example of operation: Pulse treatment (treatment of lateral canals and periapical canals)> This example of operation is an example of treating the periapical canal 2a1 and lateral canals 2b using an intra-root canal electrode 30B in which the current-conducting area X1 is provided at the tip of the electrode body 31. The operator operates the second control unit 17 to start pulse treatment (time t in Figure 8). ０(See reference). The control unit 15 sets the first switch 13c to a continuous wave transmission state and the second switch 13d to a connected state. In this state, the control unit 15 causes the continuous wave generation unit 13a to generate a continuous wave. The generated continuous wave is input to the pulse switch circuit 12a via the first switch 13c and the second switch 13d. The pulse switch circuit 12a generates a pulse current from a DC current by repeatedly switching ON / OFF based on the input continuous wave. The generated pulse current is applied to the root canal electrode 30A and the counter electrode 40 via the output transformer 12b, capacitor 12c and transmission unit 20. The pulse treatment system 1A treats the root apex 2a1 and lateral branches 2b by applying a pulse current as a continuous wave to the root canal electrode 30A and the counter electrode 40.

[0104] Here, the control unit 15 detects a decrease in the peak value of the current monitored by the power supply current monitoring unit 14. The first decrease in the peak value of the current (time t in Figure 8) １ (Reference) indicates that treatment of the collateral branch 2b, which is relatively close to the energized area X1, has been completed. Time t １ From this point onward, the pulsed current flows to the root apex 2a1. Also, the second decrease in the peak value of the current (at time t in Figure 8) ２ (Reference) indicates that treatment of the apical 2a1, which is relatively far from the electrical stimulation area X1, has been completed.

[0105] When the control unit 15 detects a second decrease in the peak value of the current (i.e., when it detects that the current value has decreased due to degeneration of the tissue at the root apex 2a1), it switches the second switch 13d from the connected state to the disconnected state. This stops the application of pulsed current to the root apex 2a1 in an optimal state for root apical treatment, and the pulsed treatment system 1B can suitably complete the treatment of the root apex 2a1 and the lateral branches 2b.

[0106] The pulse waveform of the current value shown in Figure 8 is the case when the second switch 13d is kept connected even after the second decrease in the peak value of the current value. The second decrease in the peak value of the current value indicates that treatment of the apex 2a1, which is relatively far from the energized area X1, has been completed. If the second switch 13d is kept connected, no-load current will continue to flow after the second decrease in the peak value of the current value. Therefore, it is desirable for the control unit 15 to switch the second switch 13d from the connected state to the disconnected state when it is determined that treatment of the apex 2a1 and lateral branch 2b has been completed.

[0107] Such examples of operation are applicable to the pulse therapy system 1C (see Figure 9) according to the third embodiment described later.

[0108] In the pulse treatment system 1B according to the second embodiment of the present invention, the energizing region X1 is provided in the intermediate part of the root canal electrode 30B in the axial direction, and the control unit 15 stops outputting the pulse current when it detects the second decrease in the peak value of the current value. Therefore, the pulse treatment system 1B can suitably treat multiple affected areas in the root canal 2a (for example, both the apex 2a1 and the lateral branches 2b).

[0109] <Third Embodiment> Next, the pulse therapy system according to the third embodiment of the present invention will be described, focusing on the differences from the pulse therapy system 1B according to the second embodiment. As shown in Figure 9, the pulse therapy system 1C according to the third embodiment of the present invention is equipped with an intra-root canal electrode 30C instead of intra-root canal electrode 30B.

[0110] <Intra-root canal electrode> The intra-root canal electrode 30C is equipped with an insulating part 34 instead of an insulating part 32. The insulating part 34 is a cover made of insulating material that covers the electrode body 31. An opening 34a is formed in the insulating part 34. This opening 34a realizes the current-carrying region X1.

[0111] <Fourth Embodiment> Next, the pulse therapy system according to the fourth embodiment of the present invention will be described, focusing on the differences from the pulse therapy system 1A according to the first embodiment. As shown in Figure 10, the pulse therapy system 1D according to the fourth embodiment of the present invention is equipped with a scalpel electrode 30D instead of the root canal electrode 30A and stopper 50.

[0112] <Electrode for scalpel> The electrode for scalpel 30D is placed on the soft tissue (gingiva 4) in the oral cavity, which is the affected area, and is used for incision, coagulation, hemostasis, etc. of the soft tissue. The electrode for scalpel 30D comprises an electrode body 31, an insulating part 32, and a gripping part 33.

[0113] The tip of the electrode body 31 may be bent to facilitate treatment. The shape of the tip of the electrode body 31 can be appropriately set to a shape that provides optimal tissue effect, such as a needle type, blade type, loop type, or ball type. When one point of the tip of the electrode body 31 contacts the tissue, the current density of the current flowing through the tissue becomes high. When the side of the tip of the electrode body 31 contacts the tissue, the current density of the current flowing through the tissue becomes low. Needle-type or blade-type electrode bodies 31 have thin tips (needle-shaped or knife-shaped) that can reduce the contact area with the tissue and are suitable for tissue incision. Loop-type electrode bodies 31 are suitable for tissue excision. Ball-type electrode bodies 31 can increase the contact area with the tissue and are suitable for tissue coagulation.

[0114] The insulating portion 32 covers and insulates the other axial portions of the electrode body 31 while exposing the axial tip portion. That is, in the root canal electrode 30A, the portion of the electrode body 31 exposed from the insulating portion 32 is the conductive region X1 that can conduct electricity to the affected area of ​​the subject, and the portion of the electrode body 31 covered by the insulating portion 32 is the insulated region X2 that cannot conduct electricity to the affected area of ​​the subject. In this embodiment, the insulating portion 32 is formed by a coating using an insulating material.

[0115] The gripping portion 33 is attached to the base end of the electrode body 31 and is the part that is grasped by the operator (dentist, dental hygienist, dental assistant, etc.). The gripping portion 33 is pencil-shaped and made of an insulating material.

[0116] In the pulse therapy system 1D according to the fourth embodiment of the present invention, the electrode is a scalpel electrode 30D placed on the gingiva 4, which is the affected area. Therefore, the pulse therapy system 1D can suitably treat the gingiva 4.

[0117] Although embodiments of the present invention have been described above, the present invention is not limited to the embodiments described above and can be modified as appropriate without departing from the spirit of the invention.

[0118] 1A, 1B, 1C, 1D Pulse treatment system 2 Tooth (tooth under examination) 2a Root canal 2a1 Root apex 2b Lateral canal 4 Gingiva (soft tissue) 10 Pulse treatment device 11 DC power supply unit (power supply unit) 12 Pulse current generation unit 14 Power supply current monitoring unit 15 Control unit 30A, 30B, 30C Intra-root canal electrode (electrode) 30D Scalpel electrode (electrode) 40 Opposing electrode 50 Stopper X1 Conducting area X2 Insulated area

Claims

1. A pulse therapy system comprising: an electrode placed on the affected area of ​​a subject; a counter electrode placed on the subject's body; a pulse current generation unit that generates a pulse current from a power supply unit and supplies it to the electrode and the counter electrode; a power supply current monitoring unit that monitors the current value of the current supplied to the pulse current generation unit; and a control unit that changes the output of the pulse current by controlling the pulse current generation unit based on the current value.

2. The pulse therapy system according to claim 1, characterized in that the pulse current generation unit is configured to generate continuous waves and intermittent waves as pulse currents.

3. The pulse treatment system according to claim 1, characterized in that the electrode is an intra-root canal electrode placed inside the root canal of the tooth, which is the affected area.

4. The pulse treatment system according to claim 3, characterized in that, in the intra-root canal electrode, a portion in the axial direction is a current-conducting region, and the other portion in the axial direction is an insulating region.

5. The pulse therapy system according to claim 1, characterized in that the electrode is a scalpel electrode placed on the gingiva, which is the affected area.

6. The pulse therapy system according to any one of claims 1 to 5, characterized in that the control unit stops or reduces the output of the pulse current when the current value is less than or equal to a predetermined value.

7. The pulse therapy system according to claim 6, characterized in that the control unit reduces the output of the pulse current by switching the pulse current from a continuous wave to an intermittent wave when the current value is less than or equal to the predetermined value.

8. The pulse therapy system according to claim 6, characterized in that the control unit reduces the output of the pulse current by reducing the duty cycle of the intermittent pulse current when the current value is less than or equal to the predetermined value, or by setting a pause period for each of the multiple pulse widths of the intermittent pulse current.

9. The pulse therapy system according to claim 6, characterized in that the control unit reduces the amplitude of the pulse current when the current value is less than or equal to the predetermined value.

10. The pulse therapy system according to any one of claims 1 to 5, characterized in that the control unit stops outputting the pulse current when the current value remains above a predetermined value for a predetermined period of time.

11. The pulse treatment system according to claim 4, characterized in that the current-carrying region is provided at the tip or middle portion in the axial direction of the root canal electrode, and the control unit stops outputting the pulse current when it detects the first decrease in the peak value of the current value.

12. The pulse treatment system according to claim 4, wherein the current-carrying region is provided in the intermediate part of the root canal electrode in the axial direction, and the control unit stops outputting the pulse current when it detects a second decrease in the peak value of the current value.

13. The pulse therapy system according to any one of claims 1 to 5, characterized in that the power supply unit is a constant voltage power supply, and the control unit controls the pulse current generation unit such that the output time of the pulse current increases as the current value decreases when the current value is smaller than the set current value.

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