Power supply device and power supply method

Abstract

To provide a power supply device, etc. capable of improving convenience.SOLUTION: A power supply device includes a power supply unit for supplying power to an electric medical device having a plurality of electrodes and a control unit for controlling the power supply unit so that power is supplied to part of the electrodes of the plurality of electrodes.SELECTED DRAWING: Figure 3C

Description

[Technical field]

[0001] The present disclosure relates to a power supply device and a power supply method. [Background technology]

[0002] For example, Patent Document 1 discloses an ablation system including an electrical medical device such as an ablation catheter and a power supply. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Special Publication No. 2019-500170 Summary of the Invention [Problem to be solved by the invention]

[0004] In an ablation system, there is a demand for improved convenience when ablating an affected area, and it is desirable to provide a power supply device and a power supply method that can improve convenience. [Means for solving the problem]

[0005] A power supply apparatus according to one embodiment of the present disclosure includes a power supply unit that supplies power to an electrical medical device having a plurality of electrodes, and a control unit that controls the power supply unit so that power is supplied to some of the plurality of electrodes.

[0006] A power supply method according to one embodiment of the present disclosure is a power supply method for supplying power to an electrical medical device having a plurality of electrodes, the method supplying power to some of the plurality of electrodes and supplying power to the remaining electrodes of the plurality of electrodes. [Brief description of the drawings]

[0007] [Figure 1]1 is a block diagram illustrating an example of the overall configuration of an ablation system according to an embodiment of the present disclosure. [Diagram 2] 2 is a schematic diagram illustrating an example of a schematic configuration of the ablation catheter shown in FIG. 1. [Figure 3A] 1A to 1C are schematic diagrams for explaining an ablation method according to a reference example. [Figure 3B] 11A to 11C are schematic diagrams for explaining an ablation method according to a comparative example. [Figure 3C] FIG. 2 is a schematic diagram for explaining an ablation method according to the first embodiment. [Figure 4] FIG. 11 is a timing diagram for explaining an ablation method according to a comparative example. [Diagram 5] FIG. 2 is a timing diagram for explaining the ablation method according to the first embodiment. [Figure 6] 13A and 13B are schematic diagrams illustrating examples of the configuration of an electrode group applied to the ablation methods according to Examples 2-1 and 2-2 in modified examples. [Figure 7] FIG. 11 is a timing diagram for explaining an ablation method according to Example 2-1. [Figure 8] FIG. 11 is a timing diagram for explaining an ablation method according to Example 2-2. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0008] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings. The description will be made in the following order. 1. Embodiment (Example of ablation using irreversible electroporation, etc.) 2. Modification (Example of ablation performed by grouping electrodes into multiple groups) 3. Other Modifications

[0009] <1. Preferred embodiment> [Configuration of Ablation System 5] 1 is a schematic block diagram showing an example of the overall configuration of an ablation system 5 according to an embodiment of the present disclosure. The ablation system 5 is a system used when treating an affected area 90 inside the body of a patient 9, and performs a predetermined ablation on the affected area 90.

[0010] Examples of the affected area 90 include an affected area having arrhythmia, and an affected area having a tumor such as cancer (liver cancer, lung cancer, breast cancer, kidney cancer, thyroid cancer, etc.).

[0011] The ablation system 5 includes an ablation catheter 1 and a power supply device 3. When performing ablation using the ablation system 5, for example, a return electrode plate 4 shown in Fig. 1 is also used as appropriate. Note that the "power supply method" in the present disclosure is embodied in the ablation system of the present disclosure, and will be described below as well.

[0012] (Ablation Catheter 1) The ablation catheter 1 is an electrode catheter that is inserted into the body of a patient 9 through a blood vessel and treats arrhythmia and the like by ablating an affected area 90. The ablation catheter 1 may have an irrigation mechanism that ejects (sprays) a predetermined fluid (e.g., irrigation fluid (liquid) such as saline) during ablation.

[0013] The ablation catheter 1 corresponds to a specific example of an "electrical medical device" in the present disclosure.

[0014] 2 is a schematic diagram showing an example of the general configuration of the ablation catheter 1. The ablation catheter 1 has a shaft 11 (catheter shaft) as a catheter body, and a handle 12 attached to the base end of the shaft 11.

[0015] The shaft 11 is made of a flexible tubular structure (tubular member) and extends along its own axial direction (Z-axis direction). The shaft 11 is made of synthetic resin such as polyolefin, polyamide, polyether polyamide, polyurethane, etc. The shaft 11 has a so-called single lumen structure in which one lumen (pore, through hole) is formed inside. Alternatively, the shaft 11 has a so-called multi-lumen structure in which multiple lumens (for example, four) are formed inside. Note that both a region made of a single lumen structure and a region made of a multi-lumen structure may be provided along the axial direction of the shaft 11. Various thin wires (such as conductive wires or operating wires) (not shown) are inserted into the lumens while being electrically insulated from each other.

[0016] A mechanism (temperature measuring mechanism) for measuring the temperature near the tip P1 (around the affected area 90) is provided near the tip P1 of the shaft 11. Information (temperature information It) indicating the measured temperature near the tip P1 is supplied from the ablation catheter 1 to the power supply device 3 (controller 33 described later) (see FIG. 1).

[0017] A plurality of electrodes 111, 112 are provided near the tip P1 of the shaft 11, as shown in an enlarged view of the vicinity of the tip P1 in Fig. 2. Specifically, in the example of Fig. 2, three ring-shaped electrodes (electrodes 111) and one tip electrode (electrode 112) are arranged at predetermined intervals along the axial direction (Z-axis direction) of the shaft 11. Although details will be described later, ablation is performed by passing electricity between the plurality of electrodes 111, 112 and the return electrode plate 4.

[0018] Each of the electrodes 111 is fixedly disposed on the outer circumferential surface of the shaft 11. Meanwhile, the electrode 112 is fixedly disposed at the tip of the shaft 11. Each of the electrodes 111, 112 is electrically connected to the handle 12 via a plurality of conductors inserted into the lumen of the shaft 11. Each of the electrodes 111, 112 is made of a metal material with good electrical conductivity, such as aluminum (Al), copper (Cu), stainless steel (SUS), gold (Au), platinum (Pt), etc. In order to improve the contrast of the ablation catheter 1 against X-rays when it is used, it is preferable that the electrodes 111, 112 are made of platinum or an alloy thereof.

[0019] The handle 12 is attached to the base end of the shaft 11, and has a handle body 121 (grip portion) and a rotation operation portion 122.

[0020] (Power supply unit 3) The power supply device 3 is a device that supplies power Pout for performing ablation between the electrodes 111, 112 and the return electrode 4 in the ablation catheter 1. In other words, the power supply device 3 supplies the power Pout to the ablation catheter 1. Details of the power Pout (waveform examples, etc.) will be described later (FIG. 5). As shown in FIG. 1, the power supply device 3 has an input unit 31, a power supply unit 32, a control unit 33, and a display unit 34.

[0021] The input unit 31 is a section for inputting various set values ​​and instruction signals (operation signals) for instructing a predetermined operation. Examples of the various set values ​​include the set power of the power Pout and various threshold values. The operation signals are input from the input unit 31 in response to an operation by an operator (e.g., an engineer, etc.) of the power supply device 3. However, the various set values ​​may not be input in response to an operation by an operator, but may be set in advance in the power supply device 3, for example, at the time of shipment of the product. The set values ​​input by the input unit 31 are supplied to the control unit 33. The input unit 31 is configured using, for example, predetermined dials and buttons, a touch panel, etc.

[0022] The power supply unit 32 outputs power Pout in accordance with a control signal CTL supplied from the control unit 33. The power supply unit 32 is configured using a predetermined power supply circuit (for example, a switching regulator or the like).

[0023] The control unit 33 controls the entire power supply device 3 and performs predetermined arithmetic processing, and is configured using, for example, a microcomputer, etc. The control unit 33 controls the supply operation of the power Pout in the power supply unit 32 using a control signal CTL, for example, as shown in FIG.

[0024] The display unit 34 is a part (monitor) that displays various information and outputs it to the outside. The display unit 34 is configured using displays of various types (for example, a liquid crystal display, a CRT (Cathode Ray Tube) display, or an organic EL (Electro Luminescence) display, etc.).

[0025] (Return electrode 4) 1, the return electrode 4 is attached to the body surface of a patient 9 during ablation. During ablation, electricity is passed between the electrodes 111, 112 of the ablation catheter 1 and the return electrode 4 (power Pout is supplied).

[0026] [Operation and Effects] (A.Basic movement) In the ablation system 5, when treating arrhythmia or the like, the tip P1 side of the shaft 11 of the ablation catheter 1 is inserted into the body of a patient 9 through a blood vessel.

[0027] Then, power Pout is supplied from the power supply device 3 between the electrodes 111, 112 near the tip P1 of the shaft 11 and the return electrode 4, thereby performing ablation on the affected area 90 inside the body of the patient 9. By the current flow at this time, a treatment target site (treatment portion) of the patient 9 is selectively ablated, and transvascular treatment of arrhythmia and the like is performed. Specifically, ablation is performed using, for example, RFA (Radiofrequency Ablation) or PFA (Pulsed electric Field Ablation).

[0028] (B. Details of ablation operation) Next, with reference to FIGS. 3A to 3C, 4, and 5, the ablation operation (ablation method) of this embodiment will be described in detail while comparing with a reference example and a comparative example.

[0029] FIG. 3A is a schematic diagram for explaining an ablation method according to a reference example, and FIG. 3B is a schematic diagram for explaining an ablation method according to a comparative example. FIG. 3C is a schematic diagram for explaining an ablation method according to an example (Example 1) of this embodiment. FIG. 4 is a timing diagram for explaining the ablation method according to the comparative example shown in FIG. 3B. FIG. 5 is a timing diagram for explaining the ablation method according to Example 1 shown in FIG. 3C. In FIG. 4 and FIG. 5, the horizontal axis indicates time t, and the vertical axis indicates voltage (potential difference from a reference potential). This point is the same in FIG. 7 and FIG. 8 described later.

[0030] 3A to 3C (Reference Example, Comparative Example, and Example 1) are all examples in which, for the sake of convenience, ablation is performed on the affected area 90 using four electrodes 111 (electrodes 111a to 111d) on the shaft 11. Also, the examples shown in Figs. 4 and 5 are all examples of the above-mentioned PFA (ablation using irreversible electroporation).

[0031] (B-1. Reference example) First, in the ablation method of the reference example shown in Fig. 3A, the return electrode 4 is not used, and power Pout is supplied between the multiple electrodes 111a to 111d on the shaft 11 (see the dashed arrows in Fig. 3A) to perform ablation on the affected area 90. In other words, the ablation method of the reference example is a so-called bipolar type ablation.

[0032] In the ablation method of this reference example, the range of ablation is relatively deep with respect to the diseased area 90. Specifically, in the ablation method of the reference example, the range of ablation is, for example, about 2.1 [mm] deep.

[0033] (B-2. Comparative example) On the other hand, in the ablation method of the comparative example shown in Fig. 3B, power Pout is supplied between the return electrode 4 and the multiple electrodes 111a-111d on the shaft 11 (see the dashed arrows in Fig. 3B), thereby performing ablation on the diseased area 90. In other words, the ablation method of the comparative example is a so-called monopolar ablation.

[0034] Specifically, as shown by the dashed line in FIG. 3B and in FIG. 4, in the ablation method of this comparative example, power Pout is supplied to all of the electrodes 111 (111a to 111d) at once. Also, as shown in FIG. 4, for example, a voltage is applied alternately to both the positive side and the negative side with respect to a reference potential in a pulse waveform having a predetermined amplitude value Am (for example, about 100 to 3000 [V]) and a pulse width Δtp (for example, about 1 to 10 [μs]). Note that the time intervals Δtg1 and Δtg2 between the pulse waveforms shown in FIG. 4 are, for example, about Δtg1=1 to 10 [μs] and Δtg2=1 to 100 [μs], respectively. In the example of FIG. 4, the positive and negative pulse waveforms relative to the reference potential are repeated from the first to eighth revolutions within a predetermined period ΔT (e.g., about 0.1 to 1 s), and the ablation operation is repeated in units of the period ΔT (e.g., about 10 to 1000 repetitions).

[0035] In the ablation method of this comparative example (in the case of a monopolar type), the range of ablation on the affected area 90 is shallower than that in the ablation method of the above-mentioned reference example (in the case of a bipolar type). Specifically, in the ablation method of the comparative example, the range of ablation is, for example, about 0.7 mm deep. Therefore, in the ablation method of the comparative example, the convenience during ablation may be impaired.

[0036] (B-3. Example 1) In contrast, in the ablation method of Example 1 shown in FIG. 3C, power Pout is supplied between the electrodes 111a to 111d on the shaft 11 and the return electrode 4 (see the dashed arrow in FIG. 3C), and the ablation of the affected area 90 is performed as follows. That is, similar to the ablation method of the comparative example described above, when monopolar ablation is performed, power Pout is supplied to some of the electrodes 111 (111a to 111d) in Example 1, unlike the comparative example. In other words, the control unit 33 in the power supply device 3 controls the power supply unit 32 so that power Pout is supplied to some of the electrodes 111 of the multiple electrodes 111 when ablation is performed. Then, the control unit 33 controls the power supply unit 32 so that power Pout is supplied to the remaining electrodes 111 of the multiple electrodes 111. In this case, the "remaining electrodes" may be some or all of the multiple electrodes 111.

[0037] Specifically, as shown in the arrows in Fig. 3C and Fig. 5, for example, in the ablation method of this Example 1, power Pout is sequentially supplied to some (one in this example) of the electrodes 111 among the multiple electrodes 111. That is, as shown in Fig. 5, for example, power Pout is sequentially supplied in the order of (electrode 111a → electrode 111b → electrode 111c → electrode 111d), and this sequential supply of power Pout is repeated. Note that the order of sequential supply does not depend on the arrangement order of the electrodes 111a to 111d, and may be, for example, a predetermined random order, and this also applies to modified examples (Examples 2-1 and 2-2) described later.

[0038] In detail, for example, as shown in FIG. 5, a voltage is applied alternately on both the positive and negative sides of a reference potential in a pulse waveform having a predetermined amplitude value Am (for example, about 1000 to 3000 [V]) and a pulse width Δtp (for example, about 1 to 10 [μs]). Note that the time intervals Δtg1 and Δtg2 between the pulse waveforms shown in FIG. 5 are, for example, about Δtg1=1 to 10 [μs] and Δtg2=1 to 10 [μs]. In the example of FIG. 5, the positive and negative pulse waveforms with respect to the reference potential are repeated from the first to eighth rotations within a predetermined period ΔT (for example, about 0.1 to 1 [s]), and the ablation operation is repeated in units of the period ΔT (for example, about 10 to 1000 repetitions).

[0039] In the ablation method of Example 1 (monopolar type), the range of ablation on the affected area 90 is deeper than that of the ablation method of the comparative example (monopolar type). Specifically, in the ablation method of Example 1, the range of ablation is, for example, about 2.7 mm deep. In other words, in the ablation method of Example 1, even though it is the same monopolar type as the comparative example, a depth equal to or greater than that of the ablation method of the reference example (bipolar type) is ensured.

[0040] This is believed to be due to the fact that in the ablation method of the comparative example, power Pout is supplied to all of the multiple electrodes 111 at once, so that the current during ablation flows dispersedly among the multiple electrodes 111, resulting in a decrease in current density during ablation. In other words, in the ablation method of Example 1, power Pout is (selectively) supplied to some of the multiple electrodes 111, so that the current during ablation flows concentratedly among some of the electrodes 111, resulting in an increase in current density during ablation compared to the comparative example. As a result, it is believed that the range of ablation of the affected area 90 in Example 1 is deeper than that in the comparative example, even in the case of a monopolar type.

[0041] (C. Actions and Effects) In this manner, in this embodiment, when ablation is performed by energizing the plurality of electrodes 111 and the return electrode 4, power Pout is supplied to some of the plurality of electrodes 111, as described below. That is, as described above, the range of ablation of the affected area 90 is deeper than that of the comparative example, even in the case of the monopolar type. As a result, in this embodiment, it is possible to improve convenience when ablating the affected area 90.

[0042] In this embodiment, when ablation is performed, power Pout is sequentially supplied to some of the electrodes 111 among the plurality of electrodes 111, so that the range of ablation can be deepened as described above in the vicinity of the arrangement region of each of the plurality of electrodes 111. As a result, it is possible to further improve the convenience during ablation.

[0043] <2. Modifications> Next, a modification of the above embodiment will be described. Note that the same components as those in the embodiment will be given the same reference numerals, and the description will be omitted as appropriate.

[0044] [composition] FIG. 6 shows a schematic configuration example of the electrode group Ga to Ge of an ablation catheter 1A applied to an ablation method according to modified examples (Examples 2-1 and 2-2 described later).

[0045] The ablation catheter 1A of the modified example has a predetermined distal end vicinity structure 6 near the distal end of the shaft 11A. The distal end vicinity structure 6 includes a branch point of the shaft 11A (located on the base end side of the distal end vicinity structure 6), a junction point located near the tip end of the shaft 11A (near the distal tip 110), and a plurality of (five in this example) branch structures 61a to 61e that are portions that individually connect these branch points and junction points in a curved shape. In each of the branch structures 61a to 61e, one or a plurality of ring-shaped electrodes (four electrodes 111-1 to 111-4 in the example of FIG. 6) are respectively arranged at predetermined intervals along the curved extension direction. For convenience, the electrodes 111-1 to 111-4 will be collectively referred to as electrodes 111 as appropriate in the following description.

[0046] For example, the shape of the tip-nearby structure 6 (so-called "basket shape") may be changed (deformed) by displacing the deformation wire 60 shown in Fig. 6 in both directions along the axial direction (Z-axis direction) of the shaft 11A (see dashed arrow d). Incidentally, the "basket shape" means that the shape formed by the multiple branched structures 61a-61e is similar to the curved pattern formed on the surface of a basketball, for example, as shown in Fig. 6.

[0047] The ablation catheter 1A corresponds to a specific example of an "electrical medical device" in the present disclosure.

[0048] [Operation and Effects] (A. Details of ablation operation) Next, the ablation operation of this modified example (the ablation method according to Examples 2-1 and 2-2) will be described in detail with reference to FIG. 6 as well as FIG. 7 and FIG.

[0049] Fig. 7 is a timing diagram for explaining the ablation method according to Example 2-1. Fig. 8 is a timing diagram for explaining the ablation method according to Example 2-2. Note that both of the examples shown in Fig. 7 and Fig. 8 are examples of PFA (ablation using irreversible electroporation) similar to the above-mentioned cases of Fig. 4 and Fig. 5.

[0050] First, in the ablation methods of Examples 2-1 and 2-2, power Pout is supplied to some of the electrodes 111 (111-1 to 111-4) in the same manner as in the ablation method of Example 1. Specifically, as described in detail below, in Examples 2-1 and 2-2, power Pout is sequentially supplied to some of the electrodes 111 in the same manner as in Example 1, and this sequential supply of power Pout is repeated.

[0051] In addition, in both of the ablation methods of Examples 2-1 and 2-2, as shown in FIG. 6, the electrodes 111 included in the distal end vicinity structure 6 are grouped into a plurality of electrode groups (five electrode groups Ga to Ge in this example). That is, the electrodes 111 (111-1 to 111-4) arranged on the branch structures 61a to 61e respectively constitute the electrode groups Ga to Ge. Specifically, the electrode group Ga is constituted by four electrodes 111 arranged on the branch structure 61a, the electrode group Gb is constituted by four electrodes 111 arranged on the branch structure 61b, and the electrode group Gc is constituted by four electrodes 111 arranged on the branch structure 61c. Similarly, the electrode group Gd is constituted by four electrodes 111 arranged on the branch structure 61d, and the electrode group Ge is constituted by four electrodes 111 arranged on the branch structure 61e.

[0052] (A-1. Example 2-1) In the ablation method of Example 2-1, for example, as shown in Fig. 7, power Pout is sequentially supplied to each of the electrode groups Ga to Ge. That is, in this example, power Pout is sequentially supplied to the electrodes 111 in each of the electrode groups Ga to Ge in the order of (electrode group Ga → electrode group Gb → electrode group Gc → electrode group Gd → electrode group Ge), and this sequential supply of power Pout is repeated. In addition, in the ablation method of Example 2-1, when power Pout is sequentially supplied to each of the electrode groups Ga to Ge, power Pout is collectively supplied to at least some of the electrodes 111 included in each of the electrode groups Ga to Ge (in this example, all of the electrodes 111 included in each of the electrode groups Ga to Ge).

[0053] In detail, for example, as shown in Fig. 7, a voltage is applied alternately to both the positive side and the negative side with respect to the reference potential in a pulse waveform having a predetermined amplitude value Am and a pulse width Δtp. In the example of Fig. 7, the positive and negative pulse waveforms with respect to the reference potential are repeated from the first to eighth revolutions within a predetermined period ΔT, and the ablation operation is repeated in units of the period ΔT. Note that the numerical ranges of the amplitude value Am, the pulse width Δtp, the time intervals Δtg1 and Δtg2 between the pulse waveforms, the period ΔT, and the number of repetitions of the ablation operation in Example 2-1 shown in Fig. 7 are, for example, approximately the same as in the case of Example 1 (Fig. 5) described above, and are also the same in the case of Example 2-2 (Fig. 8) described below.

[0054] (A-2. Example 2-2) Meanwhile, in the ablation method of Example 2-2, similarly to the ablation method of Example 2-1, power Pout is sequentially supplied to each of the multiple electrode groups Ga to Ge, for example, as shown in Fig. 8. That is, in this example, power Pout is sequentially supplied to the electrodes 111 in each of the electrode groups Ga to Ge in the order of (electrode group Ga → electrode group Gb → electrode group Gc → electrode group Gd → electrode group Ge), and this sequential supply of power Pout is repeated.

[0055] However, in Example 2-2, unlike Example 2-1, when power Pout is sequentially supplied to each of the multiple electrode groups Ga to Ge, power Pout is further sequentially supplied to some of the electrodes 111 included in each electrode group Ga to Ge (in this example, for each electrode 111 included in each electrode group Ga to Ge). Specifically, for example, as shown in FIG. 6, in the case of four electrodes 111 (electrodes 111-1 to 111-4) included in each electrode group Ga to Ge, the following occurs. That is, as shown for convenience by symbols (1) to (4) in FIG. 8, power Pout is sequentially supplied to each electrode 111 in each electrode group Ga to Ge in the order of, for example, (electrode 111-1 → electrode 111-2 → electrode 111-3 → electrode 111-4), and this sequential supply of power Pout is repeated.

[0056] In detail, as shown in Fig. 8, basically similarly to the case of Example 2-1, a voltage is applied alternately on both the positive and negative sides with respect to a reference potential in a pulse waveform having a predetermined amplitude value Am and pulse width. In the example of Fig. 8, the positive and negative pulse waveforms with respect to the reference potential are repeated from the 1st to 8th rotations within a predetermined period ΔT, and the ablation operation is repeated with the period ΔT as a unit.

[0057] (B. Actions and Effects) In this modification, it is possible to obtain the same effect as in the embodiment by basically performing the same action. That is, in this modification, it is possible to improve convenience when ablating the affected area 90.

[0058] In particular, in this modification, the electrodes 111 are grouped into a plurality of electrode groups Ga to Ge, and power Pout is sequentially supplied to each of the plurality of electrode groups Ga to Ge when ablation is performed, as follows. That is, for example, by setting an appropriate electrode group depending on the situation, purpose, etc. of the ablation treatment, the effectiveness of the ablation can be improved. As a result, in this modification, it is possible to further improve the convenience during ablation.

[0059] Furthermore, when performing ablation, if power Pout is sequentially supplied to each of the electrode groups Ga to Ge, and power Pout is also sequentially supplied to some (for example, one) of the electrodes 111 included in each of the electrode groups Ga to Ge (corresponding to Example 2-2), the following occurs. That is, compared to the case where power Pout is collectively supplied to at least some (for example, all) of the electrodes 111 included in each of the electrode groups Ga to Ge (corresponding to Example 2-1), the current during ablation flows concentratedly to some of the electrodes 111 even in each of the electrode groups Ga to Ge. This further increases the current density during ablation, and the range of ablation on the affected area 90 becomes deeper. As a result, it is possible to further improve the convenience during ablation.

[0060] The arrangement, shape, number (one or multiple), etc. of the electrodes 111 near the tip of the shaft 11A (in the tip-near structure 6) are not limited to the examples given in this modification. The shape of the tip-near structure 6 is also not limited to the shape described in this modification (the basket shape described above) and may be another shape. Furthermore, the configuration of the tip-near structure 6 itself (the arrangement, shape, number, etc. of the branching point and junction and the multiple branching structures described above) is also not limited to the configuration example described in this modification and may be another configuration.

[0061] Furthermore, in this modification, a specific configuration example of the electrode group Ga to Ge has been described, but the configuration of the electrode group including the plurality of electrodes 111 is not limited to this example, and other configurations may be used.

[0062] <3. Other Modifications> Although the present disclosure has been described above by giving several embodiments, modifications, and examples, the present disclosure is not limited to these embodiments, and various modifications are possible.

[0063] For example, in the above embodiment, the overall configuration of the ablation system is specifically described, but it is not necessary to include all of the devices, and other devices may also be included. Specifically, in the above embodiment, the configuration of the ablation catheter (shaft) is specifically described, but it is not necessary to include all of the components, and other components may also be included. In addition, the configuration of the electrodes in the shaft (the arrangement, shape, number, etc. of the ring-shaped electrodes and tip electrodes) is not limited to those described in the above embodiment.

[0064] The ablation catheter described in the above embodiments may be an ablation catheter that can bend the vicinity of the tip of the shaft in one direction or two directions in response to the operation of the operation unit, or may be a fixed-type ablation catheter that does not require bending operation of the vicinity of the tip of the shaft.

[0065] The values, ranges, magnitude relationships, etc. of the various parameters described in the above embodiments are not limited to those described in the above embodiments, and other values, ranges, magnitude relationships, etc. may be used.

[0066] In the above embodiment and the like, an ablation catheter has been given as a specific example of an electrical medical device, but the present invention is not limited to this example, and other electrical medical devices may also be applied.

[0067] In the above embodiment and the like, a monopolar type example has been described in which ablation is performed by passing current between an electrode on the ablation catheter and a counter electrode plate, but the present invention is not limited to this example. For example, ablation by passing current may be performed between multiple electrodes on the ablation catheter in addition to between an electrode on the ablation catheter and a counter electrode plate.

[0068] In the above embodiments, etc., specific examples of ablation methods (power supply methods) have been given and explained, but the ablation method is not limited to the methods explained in the above embodiments, etc., and other methods may be used to perform the ablation operation.

[0069] In the above-mentioned embodiment, the target of ablation is an affected part having arrhythmia or an affected part having a tumor in the patient's body, but the target of ablation is not limited to these examples. That is, the ablation system of the present disclosure can be applied to the case where the target of ablation is another part (such as an organ or body tissue) in the patient's body.

[0070] The series of processes described in the above embodiments may be performed by hardware (circuits) or software (programs). When performed by software, the software is composed of a group of programs for causing a computer to execute each function. Each program may be, for example, pre-installed in the computer and used, or may be installed in the computer from a network or a recording medium and used.

[0071] Moreover, the various examples described above may be applied in any combination.

[0072] It should be noted that the effects described in this specification are merely examples and are not limiting, and other effects may also be obtained.

[0073] The present disclosure may also have the following configurations. (1) a power supply section for supplying power to an electrical medical device having a plurality of electrodes; a control unit that controls the power supply unit so that the power is supplied to some of the plurality of electrodes; A power supply unit comprising: (2) The control unit controls the power supply unit so that the power is sequentially supplied to some of the plurality of electrodes. The power supply device according to (1) above. (3) the plurality of electrodes are grouped into a plurality of electrode groups; The control unit controls the power supply unit so that the power is supplied sequentially to each of the plurality of electrode groups. The power supply device according to (2) above. (4) The control unit controls the power supply unit so that the power is collectively supplied to at least some of the electrodes included in the electrode group. The power supply device according to (3) above. (5) The control unit controls the power supply unit so that the power is collectively supplied to all of the electrodes included in the electrode group. The power supply device according to (4) above. (6) the electrical medical device comprises a shaft having a distal end configuration; The structure near the tip is A branch point of the shaft; a junction located near the tip of the shaft; a plurality of branch structures each having a plurality of the electrodes, the branch structures being portions that individually connect the branch points and the junction points in a curved shape; Contains The electrode groups are each constituted by a plurality of the electrodes arranged for each of the branch structures. A power supply device according to any one of (3) to (5) above. (7) The control unit controls the power supply unit so that the sequential supply of the power to the part of the electrodes is repeated. A power supply device according to any one of (2) to (6) above. (8) 1. A method of powering an electrical medical device having a plurality of electrodes, comprising: supplying the power to a portion of the plurality of electrodes; The power is provided to the remaining electrodes of the plurality of electrodes. Power supply method. [Explanation of symbols]

[0074] 1,1A...ablation catheter, 11,11A...shaft, 110...tip, 111,111a to 111d,111-1 to 111-4...electrodes (ring-shaped electrodes), 112...electrodes (tip electrodes), 12...handle, 121...handle body, 122...rotation operation unit, 3...power supply unit, 31...input unit, 32...power supply unit, 33...control unit, 34...display unit, 4...return electrode, 5...ablation system, 6...structure near tip, 60...deformation wire, 61a to 61e...branch structure, 9...patient, 90...affected area, Pout...power, Vout...voltage, Am...amplitude value, CTL...control signal, It...temperature information, d...arrow, P1...tip, t...time, ΔT...period, Δtp...pulse width, Δtg1, Δtg2...time interval, Ga to Ge...electrode group.

Claims

1. 1. A power supply device for performing ablation using irreversible electroporation, comprising: a power supply section for supplying power to an electrical medical device having a plurality of electrodes; a control unit that controls the power supply unit so that the power is supplied to the plurality of electrodes, The control unit controls the power supply unit to apply, to each electrode, a voltage of a pulse set including a positive pulse with respect to a reference potential and a negative pulse with respect to the reference potential in supplying the power to each electrode. power supply.

2. The control unit controls the power supply unit so that the power is sequentially supplied to some of the plurality of electrodes.

2. The power supply device of claim 1.

3. The plurality of electrodes are grouped into a plurality of electrode groups; The control unit controls the power supply unit so that the power is supplied sequentially to each of the plurality of electrode groups.

3. The power supply device of claim 2.

4. The control unit controls the power supply unit so that the power is collectively supplied to at least some of the electrodes included in the electrode group.

4. The power supply device of claim 3.

5. The control unit controls the power supply unit so that the power is collectively supplied to all of the electrodes included in the electrode group.

5. The power supply device according to claim 4.

6. the electrical medical device comprises a shaft having a distal end configuration; The structure near the tip is A branch point of the shaft; a junction located near the tip of the shaft; a plurality of branch structures each having a plurality of the electrodes, the branch structures being portions that individually connect the branch points and the junction points in a curved shape; Contains The electrode groups are each constituted by a plurality of the electrodes arranged for each of the branch structures.

6. The power supply device according to claim 3.

7. The control unit controls the power supply unit so that the sequential supply of power is repeated.

7. The power supply device according to claim 2.

8. 1. A method of powering an electrical medical device having multiple electrodes for performing irreversible electroporation ablation, comprising: In the supply of the power to each electrode, a voltage of a pulse set including a positive pulse with respect to a reference potential and a negative pulse with respect to the reference potential is applied to each electrode. Power supply method.

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