CN114343835A - Pulse ablation electrode device and ablation catheter - Google Patents
Pulse ablation electrode device and ablation catheter Download PDFInfo
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- CN114343835A CN114343835A CN202111547638.3A CN202111547638A CN114343835A CN 114343835 A CN114343835 A CN 114343835A CN 202111547638 A CN202111547638 A CN 202111547638A CN 114343835 A CN114343835 A CN 114343835A
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Abstract
The embodiment of the specification provides a pulse ablation electrode device and an ablation catheter. The pulse ablation electrode device comprises a first catheter and a second catheter, wherein the first catheter is sleeved outside the second catheter; a plurality of carrier arms, the proximal ends of the carrier arms being connected to the distal end of the first catheter; the supporting arms and the bearing arms are arranged in pairs, the far ends of the supporting arms are connected with the far ends of the second catheters, and the near ends of the supporting arms are connected with the first preset positions of the bearing arms; the electrode is arranged at a second preset position on the distal section of the bearing arm and is used for ablation; when the second guide tube slides in the first guide tube, the far end of the second guide tube is driven to move, so that the bearing arm and the supporting arm are extended to form an umbrella shape or contracted to form a rod shape. The support arm is driven to move by the sliding of the second catheter, and the support arm drives the bearing arm to move, so that the bearing arm can contract or extend, and the ablation treatment area can be flexibly adjusted.
Description
Technical Field
The specification relates to the technical field of medical equipment, in particular to a pulse ablation electrode device and an ablation catheter.
Background
Atrial Fibrillation (AF) is one of the most common cardiac arrhythmias in clinic, and stroke and other thromboembolic events caused by it are the main causes of death or disability of patients. The pulse catheter ablation is a common operation treatment method, which utilizes pulse electric field energy to discharge instantaneously through an electrode to form irreversible micropores on a cell membrane, so as to cause cell apoptosis and achieve the treatment purpose. During the operation, the focus area needs to be located firstly, and then the focus area is ablated. At present, an ablation catheter and a mapping catheter are needed to be used in the process of a surgery respectively for pulsed electric field ablation, firstly the mapping catheter is used for mapping a focus point, and then the ablation catheter is used for ablating the focus point, so that the surgery operation steps are complex and the surgery time is long. The pulse energy is released through the electrode device arranged at the far end of the catheter, but the current electrode device is mostly in a needle type or linear structure, the area of a formed discharge area is small, the electrode device is difficult to achieve ideal attachment with a focus area, the attachment position needs to be continuously adjusted, the operation is complex, and the operation time is long.
Disclosure of Invention
In view of this, embodiments of the present disclosure provide a pulse ablation electrode device and an ablation catheter, in which the pulse ablation electrode device can be extended and contracted, has a discharge area with an adjustable area, provides a good contact of a lesion area, reduces the difficulty of surgical operation, and shortens the surgical time.
The embodiment of the specification provides the following technical scheme:
a pulse ablation electrode assembly comprising: the first guide pipe is sleeved outside the second guide pipe;
a plurality of carrier arms, a proximal end of the carrier arms being connected to a distal end of the first catheter;
the support arms and the bearing arms are arranged in pairs, the far ends of the support arms are connected with the far ends of the second catheters, and the near ends of the support arms are connected with the first preset positions of the bearing arms;
the electrode is arranged at a second preset position on the distal section of the bearing arm and is used for ablation;
when the second guide pipe slides in the first guide pipe, the far end of the second guide pipe is driven to move, so that the bearing arm and the supporting arm are expanded to form an umbrella shape or contracted to form a rod shape.
According to the pulse ablation electrode device, the second catheter drives the supporting arm to move, and the supporting arm drives the bearing arm to move, so that the bearing arm contracts or extends, the area of a discharge area is flexibly adjusted, and the electrode device can be favorably attached to a focus area; and when the second catheter drives the bearing arm to move to be close to the surface of the second catheter, the electrode device contracts into a column shape, so that the electrode device can move in the human tissue conveniently.
The invention also provides a scheme that the stretched shape of the bearing arm comprises an oblique L shape.
The invention also provides a scheme, wherein the bearing arm comprises a first bearing section and a second bearing section;
the second carrier section is connected to the distal end of the first carrier section, and the proximal end of the first carrier section is connected to the distal end of the first catheter;
the proximal end of support arm is connected bear the first preset position of arm, include: the near end of the supporting arm is connected with a first preset position in the far end direction of the first bearing section;
an electrode disposed at a second predetermined location on the distal segment of the carrier arm, comprising: and the electrode is arranged at a second preset position on the distal end section of the second bearing section.
The invention also provides a scheme, wherein the first preset position is a position which is one tenth to two tenths away from the far end of the first bearing section in the far end direction;
and/or the second predetermined position is one tenth to two tenths of a distance from the proximal end of the second carrier section in the distal direction.
The invention also provides a scheme, and a groove is arranged at the joint of the first bearing section and the second bearing section.
The invention also provides a scheme that the groove is arranged between the proximal end of the second bearing section and the electrode.
The invention also provides a scheme that the cross section of the groove is an isosceles triangle.
The invention also provides a scheme that the pulse ablation electrode device further comprises a plurality of positioning sensors, each bearing arm is provided with one positioning sensor, and the positioning sensors are used for capturing the position information of the far end of the bearing arm.
The invention also provides a scheme, wherein the supporting arm is made of memory alloy;
and/or the number of the bearing arms is odd, and the odd number is within 5-15.
And/or the number of the electrodes on the bearing arm is an even number, and the value of the even number is within 4-10.
The invention also provides a scheme, wherein the electrode is electrically connected with the energy module and the detection module;
wherein the electrodes are used for releasing the pulse energy provided by the energy module in operation and mapping the physiological signals of the pulmonary veins by the detection module before or after operation.
The invention also provides a scheme that the far end of the bearing arm is provided with a colloid.
Preferably, the colloid is a drop-shaped colloid.
The invention also provides a scheme that a passage is arranged inside the bearing arm.
Preferably, the interior of the carrying arm is provided with a passage, comprising: two passages with circular sections are arranged on two sides of the inner part of the bearing arm.
Embodiments of the present disclosure also provide an ablation catheter including a sheath, a control handle, and a pulsed ablation electrode assembly as described in any of the preceding;
the distal end of the sheath is connected with the first catheter and the second catheter of the pulse ablation electrode device;
the proximal end of the sheath tube is connected with the control handle;
the control handle is used for controlling the sliding of the second guide pipe in the first guide pipe.
Compared with the prior art, the beneficial effects that can be achieved by the at least one technical scheme adopted by the embodiment of the specification at least comprise: the first catheter is sleeved outside the second catheter, the support arms and the bearing arms are arranged in pairs, the far end of each support arm is fixedly connected with the far end of the second catheter, and the near end of each support arm is fixedly connected with the surface of the corresponding support arm, so that an umbrella-shaped structure is formed, when the first catheter slides inside the second catheter, the bearing arms and the support arms stretch or shrink, and therefore the closing and opening states of the umbrella-shaped structure are achieved. When the umbrella-shaped structure is closed, the electrode device is contracted into a rod shape and is easy to move in human tissues, and when the electrode device moves a focus area, the umbrella-shaped structure is opened, and the focus area is treated through the electrodes on the bearing arms. The electrode device is designed into an umbrella-shaped structure which can be freely closed or opened, so that the requirement of the electrode device on the movement in human tissues is met, the area of a discharge area can be flexibly adjusted according to treatment requirements, and the electrode device can be favorably attached to a focus area well, thereby improving the treatment efficiency, reducing the difficulty of operation and shortening the operation time.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic perspective view of a pulsed ablation electrode assembly in a collapsed state;
FIG. 2 is a schematic perspective view of the pulsed ablation electrode assembly in an extended state;
FIG. 3 is a schematic cross-sectional view of a carrier arm;
FIG. 4 is a schematic side view of a carrier arm recess;
fig. 5 is a schematic perspective view of a pulsatile ablation electrode device containing a mapping catheter;
the reference numbers used in the drawings are as follows:
1. a first conduit; 2. a second conduit; 3. a carrying arm; 301. a first load-bearing segment; 302. a second carrier section; 4. an electrode; 5. a positioning sensor; 6. a support arm; 7. a groove; 8. a colloid; 901. a fixing member 1; 902. a fixed member 2; 1001. a first path; 1002. a second path; 1101. a sheet-like memory alloy; 12. a catheter is mapped.
Detailed Description
The embodiments of the present application will be described in detail below with reference to the accompanying drawings.
The following description of the embodiments of the present application is provided by way of specific examples, and other advantages and effects of the present application will be readily apparent to those skilled in the art from the disclosure herein. It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. The present application is capable of other and different embodiments and its several details are capable of modifications and/or changes in various respects, all without departing from the spirit of the present application. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It is noted that various aspects of the embodiments are described below within the scope of the appended claims. It should be apparent that the aspects described herein may be embodied in a wide variety of forms and that any specific structure and/or function described herein is merely illustrative. Based on the present application, one skilled in the art should appreciate that one aspect described herein may be implemented independently of any other aspects and that two or more of these aspects may be combined in various ways. For example, an apparatus may be implemented and/or a method practiced using any number and aspects set forth herein. Additionally, such an apparatus may be implemented and/or such a method may be practiced using other structure and/or functionality in addition to one or more of the aspects set forth herein.
It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present application, and the drawings only show the components related to the present application rather than the number, shape and size of the components in actual implementation, and the type, amount and ratio of the components in actual implementation may be changed arbitrarily, and the layout of the components may be more complicated.
It should be understood that in the present specification, the "proximal end" refers to the end near the operator during the operation, and the "distal end" refers to the end far from the operator during the operation. The term "connection of component A to component B" means that component A is directly connected in contact with component B or component A is indirectly connected to component B through another component. The terms of orientation of "upper", "lower", "inner", "outer", "side", and the like described in the exemplary embodiments of the present specification are described with respect to the angles shown in the drawings, and should not be construed as limiting the exemplary embodiments of the present specification.
In addition, in the following description, specific details are provided to facilitate a thorough understanding of the examples. However, it will be understood by those skilled in the art that the aspects may be practiced without these specific details.
Atrial Fibrillation (AF) is one of the most common cardiac arrhythmias in clinic, and stroke and other thromboembolic events caused by it are the main causes of death or disability of patients. The clinical studies of many countries show that the total incidence of atrial fibrillation is about 2%, and the incidence of atrial fibrillation is gradually increasing in recent years. Non-drug treatment of atrial fibrillation is a research hotspot in recent years, and many clinical studies at home and abroad prove that the application of a catheter ablation technology to successfully electrically isolate pulmonary veins can effectively prevent recurrence of atrial fibrillation and maintain sinus rhythm.
Catheter ablation techniques have been dominated by radiofrequency energy, but other energy types have been used, such as cryoablation, ultrasound ablation, and laser ablation. However, these thermal or cold conduction based ablations have limitations in that they lack selectivity for tissue destruction in the ablation region, and the ablation assembly relies on catheter abutment to effectively contact the lesion area for treatment, and clinical cases have shown that they can cause damage to the adjacent esophagus, coronary arteries, and phrenic nerve.
Unlike conventional energy, pulsed electric field energy forms irreversible micropores in the cell membrane by means of transient discharge, causing apoptosis, and achieving the purpose of non-thermal ablation, and therefore this ablation is also called irreversible electroporation ablation. Theoretically, irreversible electroporation ablation can damage target cells without heating tissues, has cell or tissue selectivity, and can effectively protect surrounding key structures, thereby reducing complications in the operative period and reducing the recurrence rate of diseases.
The pulse electric field ablation needs to use an ablation catheter and a mapping catheter respectively in the operation process, firstly the mapping catheter is used for mapping a focus point, then the ablation catheter is used for ablating a focus area, an ablation electrode device is arranged at the far end of the ablation catheter, and pulse energy is released to the focus area through the electrode device to eliminate the focus and perform ablation treatment. However, most of the existing electrodes are arranged in a point-like or linear manner, the discharge area of the electrode device is small, and the areas of the focus areas are different, so that the electrode device is difficult to reach an ideal attaching state with the focus areas, an operator needs to continuously adjust the contact position in an operation, the operation is complex, and the operation time is long.
The inventors have made extensive and intensive studies to provide an extendable and contractible electrode device for use in the pulse ablation therapy, which has an umbrella-like shape, and as shown in fig. 2, comprises an inner catheter, an outer catheter, and a carrying arm and a support arm each connecting the ends of the two catheters, and the support arm is connected to the carrying arm at a fixed position, thereby forming an umbrella-like structure having an "umbrella top" at one end of the outer catheter, a "long bone" at the carrying arm, and a "short bone" at the support arm. The umbrella-shaped structure is gradually opened by sliding the inner catheter, so that the bearing arm gradually extends, and the effect of adjusting the contact area of the bearing arm and the focus area is achieved. The treatment electrodes are distributed on the bearing arm, when the electrode device is opened, a larger ablation electrode area can be formed, and the size of the ablation area can be flexibly adjusted by adjusting the sliding distance of the inner catheter, so that the attaching effect of a focus area is improved.
The technical solutions provided by the embodiments of the present application are described below with reference to the accompanying drawings.
The pulse ablation electrode assembly shown in fig. 1 and 2, comprising: the device comprises a first guide pipe 1 and a second guide pipe 2, wherein the first guide pipe 1 is sleeved outside the second guide pipe 2;
a plurality of carrying arms 3, the proximal ends of the carrying arms 3 being connected to the distal end of the first catheter tube 1,
the support arms 6 are arranged in pairs with the bearing arm 3, the far end of each support arm 6 is connected with the far end of the second catheter 2, and the near end of each support arm 6 is connected with a first preset position on the bearing arm 3;
the carrying arm 3 is provided with an electrode 4, the electrode 4 is arranged at a second preset position of the distal section of the carrying arm 3, and the electrode 4 is an electrode for ablation;
when the second conduit 2 slides inside the first conduit 1, the following mechanical movements are achieved:
when the second catheter 2 slides along the first catheter 1 in a direction away from the operator, the bearing arm 3 and the supporting arm 6 are mutually close to the second catheter 2, are contracted and are finally attached to the outer wall of the second catheter 2, as shown in fig. 1, the electrode device is contracted to form a rod-shaped structure, so that the electrode device can conveniently move in the human tissue and reach a focus area;
when the second catheter 2 slides along the first catheter 1 in the direction close to the operator, the carrying arm 3 and the supporting arm 6 are separated from each other towards the second catheter 2, the carrying arm 3 and the supporting arm 6 are gradually extended outwards at the moment, the electrode device is extended and opened to form an umbrella-shaped structure, and as shown in fig. 2, a plurality of carrying arms 3 jointly form an ablation treatment area with variable size.
The pulse ablation electrode device with the structure improves the shape of the ablation contact area, can be flexibly opened and closed to form an umbrella-shaped structure which is convenient for adjusting the stretching state, forms an ablation treatment area which can flexibly adjust the contact area, and releases energy through the electrode arranged on the bearing arm to achieve the purpose of treatment.
It should be noted that the first preset position on the bearing arm 3 may be any position on the bearing arm 3 as long as the supporting arm 6 can drive the bearing arm 3 to perform the contraction and extension actions. The support arm 6 is connected to the position and pulls back or pushes out the carrier arm 3 using the position as a fulcrum, so that the umbrella structure can be closed or opened, and when the umbrella structure is closed, the support arm 6 is located between the carrier arm 3 and the second catheter 2. Preferably, the first predetermined position is an arbitrary position near the midpoint of the carrying arm 3, so that the pulling-back or pushing-out operation is smoother, and when the umbrella-shaped structure is in the closed state, the supporting arm 6 is covered by the carrying arm 3, thereby forming a more compact structure.
In some embodiments, the electrode material comprises a platinum iridium alloy.
In some embodiments, the distal end of the first catheter 1 may further be provided with a fixing member 901, the fixing member 901 is provided with grooves, the number of the grooves is set according to the number of the carrying arms 3, the grooves may be set to be evenly distributed along the circumference of the fixing member 901, and the proximal end of each carrying arm 3 is placed into the corresponding groove to fix the carrying arm 3. Similarly, the distal end of the first catheter 2 may be provided with a holder 902 and a recess, and the distal end of the support arm 6 may be placed in the recess of the holder 902 to fix the support arm 6.
It should be noted that the proximal end of the carrying arm 3 can be adhered to the groove on the fixing member 901 by using an adhesive; and/or, the distal end of the support arm 6 may be adhered to the anchor 902 in a recess using an adhesive; and/or the proximal end of the support arm 6 may be adhered to a predetermined surface location of the carrier arm 3 using an adhesive. The adhesives used include cyanoacrylate adhesives.
In some embodiments, the carrying arm 3 is flat to better accommodate when the umbrella structure is closed, and is attached to the outer surface of the second catheter 2 to reduce the cross-sectional area of the electrode device, which facilitates the movement of the electrode device in the human tissue. In addition, the flat carrying arms 3 can be more stably attached to the human tissue when the umbrella-shaped structure is opened.
In some embodiments, the material of the first conduit 1 and/or the second conduit 2 comprises a polyether block polyamide (Pebax) braided tube.
In some embodiments, the first catheter 1 has a Polytetrafluoroethylene (PTFE) coating on the inner wall to provide a smooth sliding action when the second catheter 2 performs a sliding operation.
In some embodiments, the material of the support arm 6 comprises a memory alloy. In some preferred embodiments, the memory alloy comprises nitinol.
In some embodiments, the surface of the support arm 6 is provided with an insulating coating.
In some embodiments, as shown in fig. 2, when the carrying arm 3 is extended, the distal end of the carrying arm 3 is bent outward to form an inclined L-shaped structure, and the included angle between the two arms of the inclined L-shaped structure can be set according to the requirement of the ablation procedure to fit the shapes of different lesion areas. The support arm 6 can be connected to the apex of the included angle, or to a position between the apex of the included angle and the first catheter 1, so as to facilitate the contraction and extension of the carrying arm 3.
In some embodiments, as shown in fig. 1 and 2, carrier arm 3 comprises a first carrier segment 301 and a second carrier segment 302; wherein the first carrier section 301 is a section of the carrier arm 3 near the distal end of the first catheter 1, connecting the support arm 6 and the distal end of the first catheter 1; second carrier section 302 is connected to the distal end of first carrier section 301; the support arm 6 is connected to a first predetermined position in the distal direction of the first carrier section 301, whereby three sides of a triangle are formed by the carrier section 301, the support arm 6 and the second catheter 2 to form a stable structure. A second preset position on the distal end section of the second carrier section 302 is provided with an electrode 4, when the second catheter 2 is slid to extend the second carrier section 302, the second carrier section 302 contacts and abuts against the lesion area, and energy is released through the electrode 4.
It should be noted that the first preset position on the first bearing segment 301 may be any position in the distal direction of the first bearing segment 301, as long as the supporting arm 6 can drive the bearing arm 3 to perform the contraction and extension actions; the second predetermined location on the second carrier segment 302 may be any location on the distal segment of the second carrier segment 302.
In some preferred embodiments, the first predetermined position on the first carrier section 301 is one tenth to two tenths of a distance from the distal end of the first carrier section in the distal direction.
In some preferred embodiments, the second predetermined location on the second carrier section 302 is one tenth to two tenths of a distance from the proximal end of the second carrier section in the distal direction.
It should be noted that when the ablation contact area needs to be adjusted, the protruding distance of the second catheter 2 relative to the first catheter 1 can be increased or decreased to achieve this purpose. For example, when the extending distance of the second catheter 2 is increased, the supporting arm 6 drives the first carrying section 301 to approach the second catheter 2, the extension degree of the carrying arm 3 is reduced, and the ablation area formed by the plurality of second carrying sections 302 is correspondingly reduced; on the contrary, when the extending distance of the second catheter 2 is reduced, the supporting arm 6 drives the first carrying section 301 to leave the second catheter 2, the extension degree of the carrying arm 3 is increased, and the ablation area formed by the plurality of second carrying sections 302 is correspondingly increased. The operator can be according to the nimble extension distance of adjustment second pipe 2 of focus area to the extension angle of bearing arm 3 is adjusted, thereby makes electrode assembly form the not area of melting of equidimension, makes things convenient for the nimble adjustment of operating personnel, better ablation treatment.
In some embodiments, a groove 7 is provided at a connection portion of the first carrier segment 301 and the second carrier segment 302, so that when the umbrella structure is opened, the second carrier segment 302 bends at the position of the groove 7, and an included angle meeting design requirements is formed between the first carrier segment 301 and the second carrier segment 302.
In some preferred embodiments, the groove 7 is disposed between the proximal end of the second carrier section 302 and the electrode 4.
In some preferred embodiments, the cross section of the groove 7 is an isosceles triangle (as shown in fig. 4), and the groove 7 is located on the upper surface of the carrier arm 3, and when the umbrella structure is opened, the second carrier segment 302 is bent toward the upper surface of the first carrier segment 301 (as shown in fig. 2).
It should be noted that the groove may also be disposed at other positions, such as a certain position on the upper surface or the lower surface of the second bearing segment; the cross section of the groove can be in other shapes; a plurality of grooves can be further arranged, so that the second bearing section is bent according to the design requirement.
In some embodiments, the electrodes 4 are evenly distributed on the second carrier section 302, with an even number of electrodes between 4-10. For example, as shown in fig. 2, the number of the electrodes is 4, wherein the electrode near the support rod 6 is the first electrode, the electrode near the end of the second bearing section is the fourth electrode, the four electrodes are uniformly distributed, the width of the electrodes is 1.2mm, and the distance between the electrodes is 7 mm.
In some embodiments, as shown in fig. 1 and 2, the pulse ablation electrode assembly further comprises a plurality of positioning sensors 5, one positioning sensor 5 being mounted to each carrier arm 3, the positioning sensors 5 being used to capture distal position information of the carrier arms 3. The positioning sensor 5 can be arranged at any position on the carrying arm 3 according to design requirements, for example: the positioning sensors 5 are disposed at the distal ends of the carrying arms 3, as shown in fig. 2, the number of the carrying arms 3 is 5, 5 magnetic positions are used for capturing the position information of the distal ends of the 5 carrying arms 3, the 5 distal ends are respectively marked as P1-P5, and the position information of P1-P5 is represented by three-dimensional coordinates, specifically, P1-P5n(Xn,Yn,ZnN is more than or equal to 1 and less than or equal to 5); the positioning sensor 5 is electrically connected with external detection equipment, and an algorithm is preset in the detection equipment to calculate the curved surfaces formed by P1-P5 and display curved surface information to an operator as reference.
In some preferred embodiments, the positioning sensor comprises a magnetic positioning sensor.
In some preferred embodiments, the bearing arm 3 is internally mounted with a memory alloy 1101, as shown in fig. 3, the memory alloy 1101 has a predetermined shape, so that the bearing arm 3 forms a predetermined oblique L-shaped structure when extended. The carrying arm 3 can also be manufactured entirely from memory alloy.
Optionally, the memory alloy is sheet-like.
Optionally, the memory alloy comprises nitinol.
In some embodiments, as shown in fig. 1 and 2, the pulse ablation electrode assembly is mounted with a plurality of carrier arms 3, and the number of carrier arms 3 is an odd number between 5-15. Alternatively, the carrying arms 3 may be evenly distributed in the circumferential direction of the distal end of the second catheter tube 2.
In some embodiments, as shown in fig. 1 and 2, each carrier arm 3 has a plurality of electrodes 4 mounted thereon, and the number of electrodes 4 is an even number between 4-10. Alternatively, the electrodes 4 may be evenly distributed on the carrier arm 3.
In some embodiments, the electrode 4 is electrically connected to the energy module and the detection module to provide two connection modes for the electrode 4: in operation, the electrode 4 is electrically connected with an energy module, such as a high-voltage pulse module, for releasing pulse energy to ablate a lesion region; the electrodes 4 are electrically connected to a detection module, such as a detection device mounted in an external device, for mapping electrophysiological signals of the anterior and posterior atrial walls or pulmonary vein ostia, either pre-or post-operatively. By electrically connecting the electrodes 4 with the energy module and the detection module, the same set of electrode system can realize two functions of ablation and mapping, thereby simplifying the operation steps.
In some embodiments, as shown in fig. 1 and 2, the distal end of the carrying arm 3 is provided with a gel to protect the heart tissue from being damaged by the distal end of the carrying arm.
In some preferred embodiments, the gel comprises a UV (ultraviolet) curable gel. In production, the following steps are performed: the second bearing section 302 is dipped with the UV curing adhesive and vertically placed, so that one end dipped with the UV curing adhesive faces downwards, and the UV lamp is used for irradiating the UV curing adhesive to cure the UV curing adhesive for a plurality of times, so that the curing adhesive reaches the designed size.
In some preferred embodiments, the colloid is a water-drop colloid.
In some embodiments, a passage is provided inside the carrier arm 3. The access provides a connection channel for equipment mounted at the distal end of the carrier arm 3, for example: the electrodes may be connected to an external module by wires disposed within the vias; when the carrier arm is fitted with a position sensor, the position sensor may be connected to an external module by wires arranged in the passages.
Alternatively, the passages are arranged along the length of the carrier arm 3.
In some embodiments, two passages are provided inside the carrier arm 3, the two passages are respectively located at two sides inside the carrier arm 3, and the cross section of the two passages is circular. The two paths can be respectively used for connecting electrodes or positioning sensors so as to achieve better isolation effect.
In some embodiments, as shown in fig. 5, a mapping catheter 12 is also disposed within the second catheter 2 of the impulse ablation electrode device. As the electrode device moves within the body tissue, the mapping catheter 12 is retracted within the second catheter 2; when performing the mapping, the mapping catheter 12 extends from the distal end of the second catheter to map the electrophysiological signals of the anterior and posterior atrial walls or ostium of the pulmonary vein.
In some preferred embodiments, the mapping catheter 12 is a looped catheter.
Based on the same inventive concept, the embodiment of the present specification further provides an ablation catheter, which includes a sheath, a control handle and the pulse ablation electrode device described in any one of the preceding items, wherein the distal end of the sheath is connected to the first catheter 1 and the second catheter 2 of the pulse ablation electrode device; the proximal end of the sheath tube is connected with the control handle; the control handle is used to control the sliding of the second catheter 2 within the first catheter 1.
In some embodiments, an adjustment assembly is further included in the control handle, and the second conduit 2 and the first conduit 1 are connected to the adjustment assembly to adjust the distance that the second conduit 2 extends out of the first conduit 1.
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments can be referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for the method embodiments described later, since they correspond to the system, the description is simple, and for the relevant points, reference may be made to the partial description of the system embodiments.
The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present application should be covered within the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (15)
1. A pulse ablation electrode assembly, comprising:
the first guide pipe is sleeved outside the second guide pipe;
a plurality of carrier arms, a proximal end of the carrier arms being connected to a distal end of the first catheter;
the support arms and the bearing arms are arranged in pairs, the far ends of the support arms are connected with the far ends of the second catheters, and the near ends of the support arms are connected with the first preset positions of the bearing arms;
the electrode is arranged at a second preset position on the distal section of the bearing arm and is used for ablation;
when the second guide pipe slides in the first guide pipe, the far end of the second guide pipe is driven to move, so that the bearing arm and the supporting arm are expanded to form an umbrella shape or contracted to form a rod shape.
2. The pulse ablation electrode assembly of claim 1, wherein the expanded shape of the carrier arm comprises a slanted L-shape.
3. The pulse ablation electrode assembly of claim 1, wherein the carrier arm includes a first carrier section and a second carrier section;
the second carrier section is connected to the distal end of the first carrier section, and the proximal end of the first carrier section is connected to the distal end of the first catheter;
the proximal end of support arm is connected bear the first preset position of arm, include: the near end of the supporting arm is connected with a first preset position in the far end direction of the first bearing section;
an electrode disposed at a second predetermined location on the distal segment of the carrier arm, comprising: and the electrode is arranged at a second preset position on the distal end section of the second bearing section.
4. The pulse ablation electrode assembly of claim 3, wherein the first preset position is one tenth to two tenths of a distance from the distal end of the first carrier section in the distal direction;
and/or the second predetermined position is one tenth to two tenths of a distance from the proximal end of the second carrier section in the distal direction.
5. The pulse ablation electrode assembly of claim 3, wherein a groove is provided at a junction of the first carrier segment and the second carrier segment.
6. The pulse ablation electrode assembly of claim 5, wherein the recess is disposed between the proximal end of the second carrier section and the electrode.
7. The pulse ablation electrode assembly of claim 6, wherein the cross-section of the groove is an isosceles triangle.
8. The pulse ablation electrode assembly of claim 1, further comprising a plurality of positioning sensors, one mounted to each of said carrier arms, said positioning sensors for capturing distal position information of said carrier arms.
9. The pulse ablation electrode assembly of claim 1, wherein the support arm is a memory alloy support arm;
and/or the number of the bearing arms is odd, and the odd number is within 5-15.
And/or the number of the electrodes on the bearing arm is an even number, and the value of the even number is within 4-10.
10. The pulse ablation electrode assembly of claim 1, wherein the electrode is electrically connected to an energy module, a detection module;
wherein the electrodes are used for releasing the pulse energy provided by the energy module in operation and mapping the physiological signals of the pulmonary veins by the detection module before or after operation.
11. The pulse ablation electrode assembly of claim 1, wherein the distal end of the carrier arm is provided with gel.
12. The pulse ablation electrode assembly of claim 11, wherein the gel is a drop-shaped gel.
13. The pulse ablation electrode assembly of claim 1, wherein the interior of the carrier arm is provided with a passageway.
14. The pulse ablation electrode assembly of claim 13, wherein the interior of the carrier arm is provided with a passageway comprising: two passages with circular sections are arranged on two sides of the inner part of the bearing arm.
15. An ablation catheter comprising a sheath, a control handle and a pulsed ablation electrode assembly of any of claims 1-14;
the distal end of the sheath is connected with the first catheter and the second catheter of the pulse ablation electrode device;
the proximal end of the sheath tube is connected with the control handle;
the control handle is used for controlling the sliding of the second guide pipe in the first guide pipe.
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