CN218128740U - Ablation device - Google Patents

Abstract

The utility model discloses an ablation device. An ablation device comprising: an ablation catheter having opposite distal and proximal ends, the ablation catheter comprising: the traction wire is arranged in the outer tube, and one end of the traction wire is fixed at the far end of the outer tube; the inner tube is arranged in the outer tube in a penetrating mode, the far end of the inner tube extends out of the far end of the outer tube, and the inner tube can move axially relative to the outer tube; one end of the spherical component is connected with the far end of the inner pipe, and the other end of the spherical component is connected with the far end of the outer pipe; and a handle device, the handle device comprising: a housing assembly having an axial lumen passing the proximal end of the ablation catheter therethrough; a bend-controlling assembly mounted to the housing assembly, the bend-controlling assembly being capable of bending a shape at a distal end of the outer tube; and the deformation control assembly is arranged on the shell assembly, so that the inner pipe axially displaces relative to the outer pipe, and the spherical assembly deforms. The handle device of the ablation device enables the ablation catheter to complete various actions in the ablation operation through the bending control assembly and the deformation control assembly, and the function is strong.

Description

Ablation device

Technical Field

The utility model relates to the technical field of medical equipment, in particular to ablation device.

Background

Arrhythmia is a series of diseases caused by various reasons, wherein the heart beats to lose the intrinsic rhythm, the incidence rate of the diseases is high, and the diseases have great harm to health. For example, the most common clinical sustained arrhythmia is called atrial fibrillation (short for atrial fibrillation), which is a ubiquitous arrhythmia disease, and is characterized in that the electrophysiological properties of atrial myocytes are abnormally changed due to various pathogenic factors, so that the atria and the ventricles contract quickly and irregularly, uncomfortable symptoms such as palpitation, shortness of breath, fatigue and the like are caused to a patient, serious consequences such as heart failure, thromboembolism, death and the like are increased, and the curative effect of the medicament is poor.

In recent years, with the growing awareness of the pathogenesis of atrial fibrillation, most of it has been found to be associated with abnormal electrical activity originating in the pulmonary veins. The occurrence of atrial fibrillation can be prevented and treated by ablation surgery using an ablation device to achieve coagulative necrosis or electrical isolation of ventricular myocytes at the lesion. Due to the complex internal structure of the heart, less trauma is required to complete the ablation procedure. The existing ablation device generally has the defect of single function.

SUMMERY OF THE UTILITY MODEL

The embodiment of the utility model provides an ablation device can make the front end of ablating the pipe crooked and deformation under handle device's control to in the completion melt required various actions.

An embodiment of the utility model provides an ablation device, include: an ablation catheter having opposite distal and proximal ends, the ablation catheter comprising: the traction wire is arranged in the outer tube, and one end of the traction wire is fixed at the far end of the outer tube; the inner tube penetrates through the outer tube, the distal end of the inner tube extends out of the distal end of the outer tube, and the inner tube can axially move relative to the outer tube; one end of the spherical component is connected with the far end of the inner pipe, and the other end of the spherical component is connected with the far end of the outer pipe; and a handle device, the handle device comprising: a housing assembly having an axial lumen through which a proximal end of the ablation catheter passes; the bending control assembly is arranged on the shell assembly, the near end of the outer tube is fixed on the bending control assembly, the traction wire is connected with the bending control assembly, and the bending control assembly can control the traction wire to move along the axial direction of the shell assembly so as to control the shape bending at the far end of the outer tube; and the deformation control assembly is arranged on the shell assembly and is connected with the near end of the inner tube, and the deformation control assembly can slide along the axial direction of the shell assembly, so that the inner tube can axially displace relative to the outer tube, and the deformation of the spherical assembly can be controlled.

According to the utility model discloses an aforementioned embodiment, accuse curved subassembly includes: the inner circumferential surface of the spiral sleeve is provided with a first thread; a guide post having an axial lumen through which the proximal end of the ablation catheter passes, the guide post passing through the helical sleeve, the guide post being secured to the housing assembly; and the traction assembly is sleeved on the guide post and matched with the first thread, so that the traction assembly can move along the axial direction of the shell assembly relative to the spiral sleeve, and the traction assembly is connected with the traction wire.

According to any preceding embodiment of the utility model, pull the subassembly and include: the outer peripheral surface of the traction spiral block is provided with a thread matched with the inner peripheral surface of the spiral sleeve; and the traction fixing block is sleeved on the guide pillar and is abutted against one side of the traction spiral block corresponding to the far end of the ablation device, and the traction fixing block is connected with the traction wire.

According to any of the preceding embodiments of the utility model, accuse curved subassembly still includes: the rotating sleeve is fixedly connected with the spiral sleeve, and at least part of the rotating sleeve is exposed to the shell assembly; and a knob; the knob is nested in the outer peripheral surface of the rotary sleeve, and the rotary sleeve is in interference fit with the knob.

According to any of the preceding embodiments of the present invention, the handle device further comprises: and the display component is arranged on the shell component and used for displaying the bending control state.

According to any of the preceding embodiments of the present invention, the outer circumferential surface of the screw sleeve is provided with a second thread; and the display assembly includes: the indicating block is in fit connection with the second threads on the outer peripheral surface of the spiral sleeve; and the light-transmitting cover is covered on the indicating block and is arranged on the shell component.

According to the utility model discloses an arbitrary preceding embodiment, accuse deformation subassembly includes: the sliding guide rail is arranged on the shell assembly, the sliding assembly is bonded with the inner pipe, and the sliding assembly can axially slide along the sliding guide rail.

According to any preceding embodiment of the utility model, the slip subassembly includes: the sliding core shaft is provided with a through hole which is bonded with the inner pipe, and the sliding core shaft is arranged on the sliding track in a sliding manner; and a slide button; the sliding button is connected with the sliding core shaft.

According to any preceding embodiment of the utility model, the sliding assembly still includes: the connecting shaft is mutually nested and matched with the sliding core shaft, and the connecting shaft is nested and matched with the sliding button; and the reset elastic piece is sleeved on the connecting shaft, one end of the elastic piece is fixedly connected with the connecting shaft, and the other end of the elastic piece is fixedly connected with the sliding core shaft.

According to any preceding embodiment of the present invention, the spherical component comprises: the supporting tubes are arranged along the circumferential direction of the inner tube, and the far ends of the inner tube and the outer tube move relative to each other to deform the supporting tubes; and a plurality of ablation electrodes, at least one ablation electrode being connected to each support tube.

An ablation device according to an embodiment of the present invention includes an ablation catheter and a handle device. The ablation catheter has opposite distal and proximal ends. The handle device is provided with a cavity through which the proximal end of the ablation catheter can pass axially. The ablation catheter includes an outer tube, an inner tube, and a balloon assembly. The inner tube of the ablation catheter is sleeved on the outer tube, the distal end of the inner tube extends out of the distal end of the outer tube, and the inner tube can move axially relative to the outer tube. A traction wire is arranged between the wall of the outer tube and the wall of the inner tube, and one end of the traction wire is fixed at the far end of the outer tube. One end of the spherical component is connected with the far end of the inner pipe, and the other end of the spherical component is connected with the far end of the outer pipe. The handle device comprises a shell assembly, a bending control assembly and a deformation control assembly. The bending control assembly and the empty deformation assembly are installed on the shell assembly. The outer tube of the ablation catheter is fixedly connected with the bending control assembly of the handle device, and the bending control assembly can enable the traction wires of the tube wall of the outer tube and the tube wall of the inner tube to move along the axial direction of the shell assembly, so that the shape at the far end of the outer tube is bent. The deformation control assembly is connected with the near end of the inner pipe and slides axially along the shell assembly, so that the inner pipe is axially displaced relative to the outer pipe, and the spherical assembly is deformed. The handle device of the ablation device enables the front end of the ablation catheter to be bent and deformed through the bending control assembly and the deformation control assembly, so that various actions required to be completed by the ablation device in an ablation operation can be completed.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

Fig. 1 is a schematic perspective view of an embodiment of an ablation device of the present invention;

fig. 2 is a schematic cross-sectional view of a handle device in an embodiment of the ablation device of the present invention;

fig. 3 is a schematic cross-sectional view of a deformation control assembly in an embodiment of the ablation device of the present invention;

fig. 4 is a perspective view of a ball assembly in an embodiment of the ablation device of the present invention.

The reference numbers indicate:

an ablation device-1000;

an ablation catheter-100; an outer tube-110; an inner tube-120; a ball component-130; a plurality of support tubes-131; a plurality of ablation electrodes-132;

handle means-200; -a housing assembly-210; a bend control assembly-220; a spiral sleeve-221; a first thread-S1; a second thread-S2; a guide post-222; a tow assembly-223; a traction screw block-223 a; a traction fixing block-223 b; rotating sleeve-224; knob-225; a deformation control component-230; a sliding guide-231; -a slide assembly-232; sliding mandrel-232 a; a slide button-232 b; through hole-H1; connecting shaft-232 c; a return spring-232 d; a display component-240; indicate block-241; a light-transmissive cover-242.

The objects, features and advantages of the present invention will be further described with reference to the accompanying drawings.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts all belong to the protection scope of the present invention.

It should be noted that all the directional indicators (such as up, down, left, right, front, back \8230;) in the embodiments of the present invention are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the attached drawings), and if the specific posture is changed, the directional indicator is changed accordingly.

In addition, the descriptions related to "first", "second", etc. in the present invention are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicit ly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the feature. In addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should not be considered to exist, and is not within the protection scope of the present invention.

The embodiment of the utility model provides an ablation device, this ablation device can accomplish the front end pipe accuse curved and accuse deformation action that needs among the ablation operation, powerful.

Fig. 1 is a schematic perspective view of an embodiment of the ablation device of the present invention; fig. 2 is a schematic cross-sectional view of an embodiment of the ablation device of the present invention. As shown in fig. 1-2, the ablation device 1000 includes an ablation catheter 100 and a handle assembly 200. The ablation catheter 100 has opposite distal and proximal ends. The handle device 200 is provided with a cavity through which the proximal end of the ablation catheter 100 can pass axially. The ablation catheter 100 includes an outer tube 110, an inner tube 120, and a ball assembly 130. The inner tube 120 of the ablation catheter 100 is sleeved on the outer tube 110, the distal end of the inner tube 120 extends from the distal end of the outer tube 110, and the inner tube 120 is axially movable relative to the outer tube 110. A pull wire is arranged between the wall of the outer tube 110 and the wall of the inner tube 120, and one end of the pull wire is fixed at the far end of the outer tube 110. The ball assembly 130 has one end connected to the distal end of the inner tube 120 and the other end connected to the distal end of the outer tube 110. The handle device 200 includes a housing assembly 210, a bend-controlling assembly 220, and a strain-controlling assembly 230. The bending control assembly 220 and the deformation control assembly 230 are mounted to the housing assembly 210. The outer tube 110 of the ablation catheter 100 is fixedly connected to the bending control assembly 220 of the handle device 200, and the bending control assembly 220 can move the pull wires of the outer tube 110 and the inner tube 120 in the axial direction of the housing assembly 210 to bend the shape at the distal end of the outer tube 110. A deformation control member 230 is coupled to the proximal end of the inner tube 120, and the deformation control member 230 slides axially along the housing member 210 to axially displace the inner tube 120 relative to the outer tube 110, thereby deforming the ball member 130.

The utility model discloses a handle device 200 of ablation device 1000 in the technical scheme makes the front end of ablation catheter 100 crooked and deformation through accuse curved subassembly 220 and accuse deformation subassembly 230 to the various actions that need ablation device 1000 to accomplish among the ablation operation.

In some embodiments, as shown in fig. 2, the bend-controlling assembly 220 includes a helical sleeve 221, a guide post 222, and a pulling assembly 223. The inner circumferential surface of the screw sleeve 221 is provided with a first thread S1. The guide post 222 has an axial lumen for passing the proximal end of the ablation catheter 100, the guide post 222 passes through the helical sleeve 221, and the guide post 222 is secured to the housing assembly 210. The pulling element 223 is disposed on the guide post 222, and the pulling element 223 is engaged with the first thread S1. When the screw sleeve 221 is rotated, the pulling member 223 is caused to move relative to the screw sleeve 221 in the axial direction of the housing assembly 210. The pulling assembly 223 moves axially of the housing assembly 210 relative to the threaded sleeve 221 such that a pull wire coupled to the pulling assembly 223 moves axially of the housing assembly 210. One end of the pull wire is connected to the distal end of the outer tube 110 of the ablation catheter 100, the proximal end of the outer tube 110 is fixed to the bend control assembly 220, and the pull wire is moved in the axial direction of the housing assembly 210 to bend the shape at the distal end of the outer tube 110.

In some embodiments, as shown in fig. 2, the pulling assembly 223 includes a pulling screw block 223a and a pulling anchor block 223b. The traction screw block 223a has a thread on an outer circumferential surface thereof to be engaged with an inner circumferential surface of the screw sleeve 221. The traction fixing block 223b is sleeved on the guide post 222 and is abutted against one side of the traction spiral block 223a corresponding to the distal end of the ablation device 1000, and the traction fixing block 223b is connected with a traction wire. When the screw sleeve 221 is rotated such that the pulling screw block 223a moves along the proximal end of the axial housing assembly 210, the pulling screw block 223a pushes the pulling fixing block 223b to move together in the axial direction toward the proximal end of the housing assembly 210, so that the pulling wire connected to the pulling fixing block 223b moves in the axial direction toward the proximal end of the housing assembly 210. The pull wire is moved axially toward the proximal end of the housing assembly 210 causing the shape at the distal end of the outer tube 110 to bend. When the screw sleeve 221 is rotated such that the pulling screw block 223a moves relative to the screw sleeve 221 along the distal end of the axial housing assembly 210, the pulling fixing block 223b moves axially toward the distal end of the housing assembly 210 under tension of the pulling wire, so that the shape curve at the distal end of the outer tube 110 is restored to be straight.

In this embodiment, the guide post 222 is fixed to the housing assembly 210, the guide post 222 has an axial cavity coaxial with the notch assembly, the distal end of the ablation catheter 100 passes through the axial cavity of the guide post 222, and the distal end of the outer tube 110 is fixed within the axial cavity of the guide post 222.

In some embodiments, as shown in fig. 2, the steer assembly 220 further comprises a rotation sleeve 224 and a knob 225. The rotating sleeve 224 is fixedly connected to the spiral sleeve 221, so that the rotating sleeve 224 rotates to rotate the spiral sleeve 221. At least a portion of the rotating sleeve 224 is exposed to the housing assembly 210 such that when the operating screw sleeve 221 is rotated, the portion exposed to the outside of the housing assembly 210 may be directly rotated. The knob 225 is nested on the outer peripheral surface of the rotating sleeve 224, and the rotating sleeve 224 is in interference fit with the knob 225, so that the knob 225 and the rotating sleeve 224 are prevented from rotating relatively. The knob 225 may allow for increased operator friction when rotating the rotating sleeve 224, making it more convenient to rotate the rotating sleeve 224.

In this embodiment, the knob 225 is nested on the outer peripheral surface of the rotating sleeve 224, and the rotating sleeve 224 is in interference fit with the knob 225. The material of the knob 225 is preferably rubber. In other alternative embodiments, the knob 225 may be fixed to the circumference of the rotating sleeve 224 in a point-like manner.

In some embodiments, as shown in FIG. 2, the handle device 200 further includes a display assembly 240. The display assembly 240 is mounted to the housing assembly 210 for displaying the state of bending control so that the operator can precisely know the degree of bending of the outer tube 110.

In some embodiments, the outer circumferential surface of the screw sleeve 221 is provided with a second thread S2. The display assembly 240 includes an indicator block 241 and a light transmissive cover 242. The indication block 241 is coupled to the second thread S2 on the outer circumferential surface of the screw sleeve 221, the transparent cover 242 covers the indication block 241, and the transparent cover 242 is mounted on the housing assembly 210. When the spiral sleeve 221 rotates to different positions, the indication block 241 correspondingly displays different scales, and an operator can obtain the indication scales of the indication block 241 through the light-transmitting cover 242, so that the curvature of the front end of the ablation catheter 100 can be known.

In this embodiment, the light-transmissive cover 242 is preferably a transparent plastic. In other alternative embodiments, the transparent cover may also be made of other transparent materials such as transparent glass.

In some embodiments, as shown in fig. 3, the deformation control assembly 230 includes a sliding guide 231 and a sliding assembly 232. The slide rail 231 is mounted to the housing assembly 210. The sliding member 232 is bonded to the inner tube 120, and the sliding member 232 is axially slidable along the sliding guide 231. When the sliding assembly 232 slides axially along the sliding guide 231, the inner tube 120 connected with the sliding assembly 232 is axially displaced relative to the outer tube 110. One end of the ball assembly 130 is connected to the distal end of the inner tube 120, and the other end is connected to the distal end of the outer tube 110. When the inner tube 120 is axially displaced relative to the outer tube 110, so that the distal end of the ball assembly 130 is displaced towards the ball-shaped proximal end, the shape of the ball assembly 130 changes with the axial displacement of the inner tube 120, so as to adapt to different requirements in the ablation procedure.

In this embodiment, the sliding guide 231 is mounted on the housing assembly 210, the sliding guide 231 has an axial cavity coaxial with the axial cavity of the guide post 222, and the inner tube 120 of the ablation catheter 100 is inserted into the axial cavity of the sliding guide 231 from the guide post 222 and bonded to the sliding assembly 232.

In some embodiments, as shown in fig. 3, the slide assembly 232 includes a slide mandrel 232a and a slide button 232b. The sliding core shaft 232a is provided with a through hole H1, the through hole H1 is bonded to the inner tube 120, and the sliding core shaft 232a is slidably disposed on the sliding rail. The slide button 232b is connected to the slide spindle 232 a. The sliding button 232b is operated to make the sliding button 232b drive the sliding core shaft 232a to axially slide along the sliding guide rail 231, so that the inner tube 120 is axially displaced relative to the outer tube 110, and the ball assembly 130 is deformed. The slide button 232b makes the operation more convenient.

In some embodiments, as shown in fig. 3, the sliding assembly 232 further includes a connecting shaft 232c and a return spring 232d. The connecting shaft 232c is fitted in the slide core shaft 232a, and the connecting shaft 232c is fitted in the slide button 232b. The elastic member 232d that resets is located the connecting axle 232c in the cover, and the one end and the connecting axle 232c fixed connection of elastic member, the other end and the fixed connection of slip mandrel 232 a. When pressure is applied to the sliding button 232b, the connecting shaft 232c is displaced in the axial direction, and the return elastic member 232d is compressed. The pressure on the sliding button 232b is released, and the connecting shaft 232c drives the sliding button 232b to return to the original position under the elastic force of the elastic return member 232d.

In some embodiments, as shown in fig. 4, bulb assembly 130 includes a plurality of support tubes 131 and a plurality of ablation electrodes 132. Each support tube 131 has one end connected to the distal end of the inner tube 120 and the other end connected to the distal end of the outer tube 110, and a plurality of support tubes 131 are arranged in the circumferential direction of the inner tube 120. Movement of the distal end of the inner tube 120 relative to the distal end of the outer tube 110 deforms the support tubes 131, with each support tube 131 having at least one ablation electrode 132 attached thereto. When the inner tube 120 is pulled by the deformation control assembly 230 to generate axial displacement relative to the outer tube 110, the plurality of support tubes 131 of the spherical assembly 130 are deformed, the initial shape of the spherical assembly 130 is more conformable to the diseased tissue, and then the diseased tissue is subjected to ablation treatment by the action of the ablation electrodes 132 connected to the support tubes 131.

In this embodiment, the bulb assembly 130 includes a plurality of support tubes 131 and a plurality of ablation electrodes 132. In other alternative embodiments, the ball assembly 130 may also be in other shapes, such as a metal mesh balloon, etc.

The above only is the preferred embodiment of the present invention, not so limiting the patent scope of the present invention, all of which are under the conception of the present invention, the equivalent structure transformation made by the contents of the specification and the drawings, or direct/indirect application in other related technical fields are all included in the patent protection scope of the present invention.

Claims (10)

1. An ablation device, comprising:

an ablation catheter having opposite distal and proximal ends, the ablation catheter comprising:

the device comprises an outer tube, wherein a traction wire is arranged in the outer tube, and one end of the traction wire is fixed at the far end of the outer tube;

an inner tube disposed through the outer tube, a distal end of the inner tube extending from a distal end of the outer tube, the inner tube being axially movable relative to the outer tube; and

a ball assembly having one end connected to the distal end of the inner tube and the other end connected to the distal end of the outer tube; and

a handle arrangement, the handle arrangement comprising:

a housing assembly having an axial lumen through which the proximal end of the ablation catheter passes;

the bending control assembly is arranged on the shell assembly, the proximal end of the outer tube is fixed on the bending control assembly, the traction wire is connected with the bending control assembly, and the bending control assembly can control the traction wire to move along the axial direction of the shell assembly so as to control the shape bending at the distal end of the outer tube; and

and the deformation control assembly is arranged on the shell assembly and is connected with the near end of the inner tube, and the deformation control assembly can slide axially along the shell assembly, so that the inner tube can axially displace relative to the outer tube to control the deformation of the spherical assembly.

2. The ablation device of claim 1, wherein the bend-controlling assembly comprises:

a screw sleeve provided with a first thread on an inner peripheral surface thereof,

a guide post having an axial lumen through which a proximal end of the ablation catheter passes, the guide post passing through the helical sleeve, the guide post being secured to the housing assembly; and

the traction assembly is sleeved on the guide pillar and matched with the first thread, so that the traction assembly can move along the axial direction of the shell assembly relative to the spiral sleeve, and the traction assembly is connected with the traction wire.

3. The ablation device of claim 2, wherein the pulling assembly comprises:

the outer peripheral surface of the traction spiral block is provided with a thread matched with the inner peripheral surface of the spiral sleeve; and

the traction fixing block is sleeved on the guide pillar and is abutted against one side, corresponding to the far end of the ablation device, of the traction spiral block, and the traction fixing block is connected with the traction wire.

4. The ablation device of claim 3, wherein said bend-controlling assembly further comprises:

a rotating sleeve fixedly connected with the helical sleeve, at least a portion of the rotating sleeve being exposed to the housing assembly;

the knob is nested on the peripheral surface of the rotating sleeve, and the rotating sleeve is in interference fit with the knob.

5. The ablation device of claim 4 wherein said handle means further comprises:

and the display assembly is arranged on the shell assembly and is used for displaying the bending control state.

6. The ablation device of claim 5 wherein an outer peripheral surface of said helical sleeve is provided with a second thread; and

the display assembly includes:

the indicating block is in fit connection with the second threads on the outer peripheral surface of the spiral sleeve; and

the printing opacity lid, the printing opacity lid is located indicate the piece, the printing opacity lid install in shell subassembly.

7. The ablation device of any one of claims 1 to 6, wherein said shape-changing control assembly comprises:

a sliding guide rail mounted to the housing assembly, an

And the sliding assembly is bonded with the inner pipe and can axially slide along the sliding guide rail.

8. The ablation device of claim 7, wherein said sliding assembly comprises:

the sliding core shaft is provided with a through hole, the through hole is bonded with the inner pipe, and the sliding core shaft is arranged on the sliding guide rail in a sliding manner; and

a slide button; the sliding button is connected with the sliding core shaft.

9. The ablation device of claim 8, wherein said sliding assembly further comprises:

the connecting shaft and the sliding mandrel are mutually nested and matched, and the connecting shaft is nested and matched with the sliding button; and

the elastic part resets, the elastic part cover that resets is located the connecting axle, the one end of elastic part with connecting axle fixed connection, the other end with sliding core axle fixed connection.

10. The ablation device of claim 9, wherein the ball assembly comprises:

the supporting tubes are arranged along the circumferential direction of the inner tube, and the supporting tubes are deformed by the movement of the far end of the inner tube relative to the far end of the outer tube; and

a plurality of ablation electrodes, at least one of the ablation electrodes being connected to each of the support tubes.

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