TWI706769B - Ablation device - Google Patents

Abstract

An ablation device including a first electrode, at least one second electrode and a guiding sleeve is provided. The guiding sleeve is fitted around the first electrode and the second electrode, so as to close the second electrode. The guiding sleeve is adapted to move along an axial direction of the first electrode, so as to adjust a length of the first electrode exposed by the guiding sleeve and enable the second electrode to be released and expanded along a radial direction of the first electrode.

Description

Ablation device

The present disclosure relates to an ablation device, and particularly relates to an adjustable ablation device.

Radiofrequency ablation (RFA) is currently the most widely used tumor ablation technique. During operation, the doctor accurately inserts the ablation device into the treatment area using medical imaging, such as ultrasound, computed tomography (CT), magnetic resonance imaging (MRI) and other tools. The conductive area will release radio frequency (radio frequency) waves, and the surrounding tissues will generate heat energy due to ion agitation disturbance, causing the temperature in the treatment area to rise. When the temperature in the treatment area reaches 45°C or more, the treatment area The internal tissues containing tumors will cause coagulation necrosis of the local tissues. The ablation range of the ablation device is determined by its conductive range and is limited by existing product specifications. If the shape of the tumor is irregular or the tumor is large in size, it is often necessary to perform multiple ablations and sacrifice the normal tissues around the treatment area to complete the ablation of the tumor. The operation time is therefore too long.

The ablation device of the present disclosure includes a first electrode, at least one second electrode and a guide sleeve. The guiding sleeve is sleeved outside the first electrode and the second electrode to close the second electrode. The guide sleeve is adapted to move along the axial direction of the first electrode to adjust the length of the first electrode exposed by the guide sleeve, and to release the second electrode to expand in the radial direction of the first electrode.

In order to make the above-mentioned features and advantages of the present disclosure more obvious and understandable, the following specific embodiments are described in detail in conjunction with the accompanying drawings.

FIG. 1 is a schematic cross-sectional view of an ablation device according to an embodiment of the disclosure. Fig. 2 is an expanded schematic diagram of the second electrode of Fig. 1. Please refer to FIGS. 1 and 2, the ablation device 100 of this embodiment includes a first electrode 110, at least one second electrode 120 (multiple are shown), and a guide sleeve 130. The first electrode 110 is, for example, needle-shaped or columnar, and may be solid or hollow. The second electrodes 120 are arranged on the outside of the first electrode 110 and surround the first electrode 110. Each second electrode 120 is elastic and tends to bend and expand in the radial direction of the first electrode 110. The guide sleeve 130 is, for example, a conductive material (such as a conductive metal) or an insulating material and is sleeved outside the first electrode 110 and the second electrodes 120 to resist the elastic force of the second electrodes 120 and is retracted as shown in FIG.合 SECOND ELECTRODE 120. The guide sleeve 130 can move along the axial direction A of the first electrode 110 to become the state shown in FIG. 2 to adjust the length of the first electrode 110 exposed by the guide sleeve 130 and to release each second electrode 120. It expands in the radial direction perpendicular to the axial direction A of the first electrode 110.

Based on this configuration, the length of the first electrode 110 exposed along the axial direction A can be changed by moving the guiding sleeve 130 during the operation to adjust the ablation range, so as to conveniently and effectively ablate irregularly shaped tumors. In addition, by folding the second electrodes 120 by the guide sleeve 130, the ablation device 100 can be easily inserted into the affected area. After the ablation device 100 is inserted into the affected area, the second electrodes 120 can be placed in appropriate positions according to the shape and size of the tumor. The electrode 120 is released and expanded by the guide sleeve 130, which can strengthen the ablation range of the ablation device 100 in the radial direction of the axial direction A, and effectively ablate the tumor.

Furthermore, the second electrodes 120 are, for example, electrically independent of each other, and each of the second electrodes 120 can act independently to move along the axis A relative to the first electrode 110. In this way, the movement of the second electrodes 120 can be used to perform ablation sequentially at different time points, and the second electrodes 120 can be used to perform ablation at different positions on the axial direction A to enhance the radial ablation range for the required positions. , To adapt to the affected parts of different situations.

In this embodiment, the outer diameter of the guide sleeve 130 may be less than 3 mm, so as to be easily inserted into the affected part in the folded state. On the other hand, when the second electrodes 120 are expanded as shown in FIG. 2 to increase the outer diameter of the ablation device 100 in the radial direction, the maximum outer diameter of the ablation device 100 in the radial direction has enhanced radial ablation. range. In addition, the cross-section of each second electrode 120 of this embodiment is, for example, flat, so that it is easy to bend in a desired direction. In other embodiments, the cross-section may be circular or other shapes, which is not limited in this disclosure.

Please refer to FIG. 1, the first electrode 110 of this embodiment may be a hollow structure with a flow channel 110a inside, and a cooling fluid F1 is suitable to flow along the flow channel 110a to cool the ablation device 100 and avoid it during the ablation process. Overheating. In this embodiment, the number of runners 110a is one, but in other embodiments, the number of runners may also be multiple, and the disclosure is not limited thereto. In other embodiments, the flow channel may not be provided in the first electrode 110, or the ablation device 100 may be cooled by other suitable methods.

In this embodiment, the first electrode 110 and the second electrode 120 are, for example, a positive electrode and a negative electrode, respectively, and are in a bipolar configuration. However, the present disclosure is not limited to this, and the first electrode 110 and the second electrode 120 can also be both positive electrodes or both negative electrodes, and be a monopolar configuration. Under the bipolar configuration, current is generated between the first electrode 110 and the second electrode 120, and a smaller ablation range is possible. Under the unipolar configuration, the current is generated between the ablation device 100 and the electrode pad attached to the vicinity of the affected area, and a larger ablation range is possible. The ablation device 100 can be configured as the bipolar or the unipolar according to requirements to meet different surgical requirements.

3 is a schematic cross-sectional view of an ablation device according to another embodiment of the disclosure. The ablation device 100A shown in FIG. 3 is similar to the ablation device 100 shown in FIG. 1, but it should be noted that the first electrode 110 in FIG. 3 does not have a flow channel for cooling, but has a flow channel for providing working fluid F2. The flow channel 110b of the flow channel 110b has an opening 110b1 on a surface 110c of the first electrode 110, and a working fluid F2 is suitable to flow along the flow channel 110b and be injected to the affected area from the opening 110b1. The working fluid F2 can be anesthetics, imaging agents and other medicines required for surgery, or can be saline used to enhance the conductive effect of the tissue, which is not limited in the present disclosure. In this embodiment, the number of runners 110b is one, but in other embodiments, the number of runners may also be multiple, and the present disclosure is not limited thereto.

4 is a schematic cross-sectional view of an ablation device according to another embodiment of the present disclosure. The ablation device 100B shown in FIG. 4 is similar to the ablation device 100 shown in FIG. 1. It should be noted that the material of the guide sleeve 130 of the ablation device 100B includes conductive materials (such as conductive metals). Correspondingly, the ablation device 100B further includes an insulating sleeve 140 that is sheathed outside the guide sleeve 130 to prevent the conductive guide sleeve 130 from unexpectedly expanding the ablation range, and at the same time Avoid electrical conduction to the user's operating terminal and affect operation. In the embodiment shown in FIG. 4, the flow channel 110a shown in FIG. 1 or the flow channel 110b shown in FIG. 3 may also be provided in the first electrode 110, and the disclosure is not limited thereto.

Fig. 5 is a schematic front view of an ablation device according to another embodiment of the present disclosure. 6A and 6B illustrate the operation of the ablation device of FIG. 5. To make the drawing clearer, the second electrode 220 in FIGS. 6A and 6B is not shown in FIG. 5. In the ablation device 200 of FIG. 5, FIG. 6A and FIG. 6B, the first electrode 210, the second electrode 220, and the guide sleeve 230 are arranged and function similarly to the first electrode 110, the second electrode 120, and the guide tube in FIG. The configuration and mode of action of the guiding sleeve 130 will not be repeated here. It should be noted that the ablation device 200 further includes a moving member 250. The moving member 250 is arranged outside the first electrode 210 and is adapted to move along the axial direction A of the first electrode 210. A plurality of second electrodes 220 are arranged to be connected to the moving member. One end of piece 250. Accordingly, the movement of the moving member 250 along the axial direction A can simultaneously drive the second electrodes 220 connected thereto to move along the axial direction A.

In addition, the ablation device 200 further includes an operating member 260, which is connected to an end of the moving member 220 away from the second electrode 220, and is adapted to be forced to drive the moving member 220 and correspondingly connected to the moving member 220. The two electrodes 220 move along the axial direction A. Similarly, the ablation device 200 further includes an operating element 270 connected to the guiding sleeve 210 and adapted to be forced to drive the guiding sleeve 270 to move along the axial direction A. Accordingly, the user can pull or push the operating element 260 and the operating element 270 to adjust the relative positions of the first electrode 210, the guide sleeve 230, and the moving element 250 as shown in FIGS. 6A and 6B as required.

Fig. 7 is a schematic front view of an ablation device according to another embodiment of the present disclosure. Fig. 8 shows the operation of the ablation device of Fig. 7. To make the drawing clearer, the second electrode 220 in FIG. 8 is not shown in FIG. 7. The ablation device 200A of FIGS. 7 and 8 is similar to the ablation device 200 of FIGS. 5, 6A, and 6B, but it should be noted that the number of moving parts 250 of the ablation device 200A is multiple (four in FIG. 7 ), each moving part 250 is connected to a part of the second electrodes 220. Moreover, these moving parts 250 are electrically independent of each other. Accordingly, each moving member 250 can be actuated independently and move along the axial direction A relative to the first electrode 210, so that these moving members 250 and corresponding second electrodes 220 respectively connected to different moving members 250 can be used at different time points. The moving parts 250 and the second electrodes 220 respectively connected to the different moving parts 250 can be used to perform ablation at different positions in the axial direction A to strengthen the radial ablation range according to the required positions to adapt to various The affected part of the situation. In other embodiments, the number of moving parts 250 may be other, and the present disclosure does not limit this. The following illustrates this with a diagram.

Fig. 9 is a schematic front view of an ablation device according to another embodiment of the present disclosure. Fig. 10 shows the operation of the ablation device of Fig. 9. To make the drawing clearer, the second electrode 220 in FIG. 10 is not shown in FIG. 9. The ablation device 200B in FIGS. 9 and 10 is similar to the ablation device 200A in FIGS. 7 and 8, but it should be noted that the number of moving parts 250 of the ablation device 200B is eight. In other embodiments, the number of the moving parts 250 may be two, three, five, etc., which is not limited in this disclosure. In addition, in this embodiment, the number of second electrodes 220 corresponding to each movable member 250 may be one. However, in other embodiments, the number of second electrodes 220 on each movable member 250 may be There are more than one, and the list is not limited.

Fig. 11 is a schematic diagram of an ablation device according to another embodiment of the present disclosure. The ablation device 200C in FIG. 11 is similar to the ablation device 200 in FIG. 5, FIG. 6A and FIG. 6B, but it should be noted that although the plurality of second electrodes 220 are configured and connected to the moving part 250, some of the second electrodes 220 are The axial direction A is arranged and connected to the moving part 250 instead of only being arranged at one end of the moving part 250, so as to increase the ablation range of the second electrodes 220 perpendicular to the axial direction A. In the embodiments shown in FIGS. 7 to 10, a plurality of second electrodes 220 arranged along the axial direction A can also be arranged on each movable member 250, and the disclosure is not limited thereto. In addition, in the embodiments shown in FIGS. 5 to 11, the flow channel 110a shown in FIG. 1 or the flow channel 110b shown in FIG. 3 can also be provided in the first electrode 210, and the present disclosure does not limit this.

In the above-mentioned embodiments, the second electrodes 120 and 220 are arranged outside the first electrodes 110 and 210 for illustration. However, in other embodiments, the first electrodes 110 and 210 may be designed as hollow structures. The second electrodes 120 and 220 are arranged in the first electrodes 110 and 210 and are not limited to those listed.

In summary, the ablation device of the present disclosure can move the guide sleeve during the operation to change the ablation range of the first electrode along the axial direction, so as to conveniently and effectively ablate the tumor. In addition, the second electrode is folded by the guide sleeve, so that the ablation device can be easily inserted into the affected area. After the ablation device is inserted into the affected area, the second electrode can be guided by the guide sleeve in the appropriate position according to the shape and size of the tumor. The tube is released and expanded to change the ablation range of the first electrode along the radial direction, effectively ablating irregular-shaped tumors. In addition, multiple second electrodes can be used to perform ablation in sequence at different time points, and multiple second electrodes can be used to perform ablation at different positions in the axial direction, so as to adapt to various conditions of the affected area.

Although this disclosure has been disclosed in the above embodiments, it is not intended to limit the disclosure. Anyone with ordinary knowledge in the relevant technical field can make some changes and modifications without departing from the spirit and scope of this disclosure. Therefore, The scope of protection of this disclosure shall be subject to those defined by the attached patent scope.

100, 100A, 100B, 200, 200A, 200B: Ablation device 110, 210: First electrode 110a, 110b: Flow channel 110b1: Opening 110c: Surface 120, 220: Second electrode 130, 230: Guide sleeve 140: Insulating sleeve 250: moving parts 260, 270: operating parts A: axial F1: cooling fluid F2: working fluid

FIG. 1 is a schematic cross-sectional view of an ablation device according to an embodiment of the disclosure. Fig. 2 is an expanded schematic diagram of the second electrode of Fig. 1. 3 is a schematic cross-sectional view of an ablation device according to another embodiment of the disclosure. 4 is a schematic cross-sectional view of an ablation device according to another embodiment of the present disclosure. Fig. 5 is a schematic front view of an ablation device according to another embodiment of the present disclosure. 6A and 6B illustrate the operation of the ablation device of FIG. 5. Fig. 7 is a schematic front view of an ablation device according to another embodiment of the present disclosure. Fig. 8 shows the operation of the ablation device of Fig. 7. Fig. 9 is a schematic front view of an ablation device according to another embodiment of the present disclosure. Fig. 10 shows the operation of the ablation device of Fig. 9. Fig. 11 is a schematic diagram of an ablation device according to another embodiment of the present disclosure.

100: Ablation device 110: First electrode 120: Second electrode 130: Guide sleeve

Claims (14)

An ablation device, comprising: a first electrode; at least one second electrode; and a guiding sleeve, sheathed outside the first electrode and the at least one second electrode to collapse the at least one second electrode, wherein The guide sleeve is adapted to move along an axial direction of the first electrode to adjust the length of the first electrode exposed by the guide sleeve, and to release the at least one second electrode, and the first electrode The electrode is expanded in a radial direction; and at least one moving member is disposed on the outside of the first electrode and is adapted to move along the axial direction of the first electrode, wherein the number of the at least one second electrode is multiple, at least partially The second electrodes are connected to one end of the at least one moving part, at least a part of the second electrodes on the at least one moving part are arranged and connected to the moving part along the axial direction of the first electrode, and the second The electrodes surround the first electrode, and each of the second electrodes is adapted to move in the axial direction relative to the first electrode. According to the ablation device described in item 1 of the scope of patent application, the second electrodes are electrically independent of each other. The ablation device described in claim 1 further includes at least one operating element, wherein the at least one operating element is connected to an end of the at least one moving element away from the second electrodes and is adapted to be driven by a force. At least one moving element and the second electrodes correspondingly connected to the at least one moving element move along the axial direction of the first electrode. According to the ablation device described in item 1 of the scope of patent application, wherein the number of the at least one moving element is multiple, and each of the moving elements is connected to a part of the second electrodes. In the ablation device described in item 4 of the scope of patent application, the moving parts are electrically independent of each other. For example, the ablation device described in claim 1 further includes an operating member, wherein the operating member is connected to the guide sleeve and is adapted to be forced to drive the guide sleeve along the first electrode. Axial movement. The ablation device described in item 1 of the scope of patent application further includes an insulating sleeve, wherein the guide sleeve is made of conductive material, and the insulating sleeve is sleeved outside the guide sleeve. According to the ablation device described in item 1 of the scope of patent application, the outer diameter of the guide sleeve is less than 3 mm. According to the ablation device described in claim 1, wherein the first electrode has at least a flow channel in it, and a cooling fluid is adapted to flow along the at least flow channel. The ablation device according to claim 1, wherein the first electrode has at least a flow channel, the at least flow channel has an opening on a surface of the first electrode, and a working fluid is adapted to travel along the at least flow channel Flow and inject from the opening. The ablation device according to claim 1, wherein one of the first electrode and the at least one second electrode is a positive electrode, and the other of the first electrode and the at least one second electrode is a negative electrode . According to the ablation device described in claim 1, wherein the first electrode and the at least one second electrode are both positive electrodes or both negative electrodes. According to the ablation device described in claim 1, wherein the at least one second electrode is disposed outside the first electrode. According to the ablation device described in claim 1, wherein the at least one second electrode is disposed in the first electrode.

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