CN115363736A - Pulse ablation catheter - Google Patents
Pulse ablation catheter Download PDFInfo
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- CN115363736A CN115363736A CN202210938742.3A CN202210938742A CN115363736A CN 115363736 A CN115363736 A CN 115363736A CN 202210938742 A CN202210938742 A CN 202210938742A CN 115363736 A CN115363736 A CN 115363736A
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- 238000002679 ablation Methods 0.000 title claims abstract description 146
- 238000005452 bending Methods 0.000 claims abstract description 30
- 238000007493 shaping process Methods 0.000 claims description 49
- 230000007704 transition Effects 0.000 claims description 9
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 claims description 8
- 239000000084 colloidal system Substances 0.000 claims description 7
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- 230000007246 mechanism Effects 0.000 claims description 7
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 claims description 3
- 229910052737 gold Inorganic materials 0.000 claims description 3
- 239000010931 gold Substances 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 claims description 3
- HWLDNSXPUQTBOD-UHFFFAOYSA-N platinum-iridium alloy Chemical class [Ir].[Pt] HWLDNSXPUQTBOD-UHFFFAOYSA-N 0.000 claims description 3
- 229910000566 Platinum-iridium alloy Inorganic materials 0.000 claims description 2
- 238000011282 treatment Methods 0.000 abstract description 12
- 230000000694 effects Effects 0.000 abstract description 6
- 230000002349 favourable effect Effects 0.000 abstract description 3
- 206010003658 Atrial Fibrillation Diseases 0.000 description 12
- 239000000155 melt Substances 0.000 description 7
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- 210000000170 cell membrane Anatomy 0.000 description 2
- 239000003814 drug Substances 0.000 description 2
- 229940079593 drug Drugs 0.000 description 2
- 210000003492 pulmonary vein Anatomy 0.000 description 2
- 238000011160 research Methods 0.000 description 2
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- 238000011298 ablation treatment Methods 0.000 description 1
- 238000004026 adhesive bonding Methods 0.000 description 1
- 230000001746 atrial effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000013153 catheter ablation Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
- A61B2018/00315—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body for treatment of particular body parts
- A61B2018/00345—Vascular system
- A61B2018/00351—Heart
- A61B2018/00375—Ostium, e.g. ostium of pulmonary vein or artery
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
- A61B2018/00571—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body for achieving a particular surgical effect
- A61B2018/00613—Irreversible electroporation
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- Engineering & Computer Science (AREA)
- Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
- Heart & Thoracic Surgery (AREA)
- Medical Informatics (AREA)
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Abstract
The embodiment of the specification provides a pulse ablation catheter which comprises an ablation assembly, a catheter body assembly and a control handle which are connected in sequence; the utility model discloses a set silk is worn to be equipped with in ablation assembly's the ablation sleeve pipe, the distal end rotation bending of set silk becomes the ring and set silk department is on a face of cylinder, ablation sleeve pipe passes through the set silk and forms a stable shape structure, the distal end of body subassembly is crooked under control handle's control, the drive is connected in the ablation subassembly removal of body subassembly distal end, make ablation subassembly remove to the target ablation region, form and lean on well, be favorable to ablating the ring electrode release ablation energy of sleeve pipe surface, the treatment effect is improved, this pulse ablation catheter is convenient for operate, be favorable to reducing the operation degree of difficulty of operation, shorten the operation time, reduce the operation risk.
Description
Technical Field
The specification relates to the technical field of medical equipment, in particular to a pulse ablation catheter.
Background
Atrial Fibrillation (AF, atrial Fibrillation) is one of the most common clinical arrhythmias, and the total incidence rate of Atrial Fibrillation is about 2% as shown by multi-national clinical studies, and the incidence rate of Atrial Fibrillation is gradually increasing in recent years. Non-drug treatment of atrial fibrillation is a research focus in recent years, for example, electrical isolation of pulmonary veins using catheter ablation techniques is effective in preventing recurrence of atrial fibrillation and maintaining sinus rhythm.
The pulse ablation is different from other physical ablation based on the thermal ablation principle, such as radio frequency, freezing, microwave, ultrasound and the like, microsecond pulses are released through a pulse ablation catheter, and pulse electric field energy forms irreversible micropores on cell membranes through instant discharge to cause cell apoptosis so as to achieve the purpose of treatment. During the ablation operation, the ablation catheter enters human tissues, an ablation component is arranged at the far end (namely, the end of the ablation catheter far away from an operator) of the ablation catheter, the ablation component reaches and clings to a focus area, and pulses are released for treatment. Because different focus areas have different shapes, the shape that melts the subassembly probably does not adapt to with the shape in focus area, can not form effectual pasting, owing to paste poorly between the electrode, the electric field of production is not enough, and the operator need constantly adjust to paste the angle and look for better pasting the position, and the operation degree of difficulty of operation is big, and operation time is long, increases the operation risk.
Disclosure of Invention
In view of this, the embodiments of the present disclosure provide a pulse ablation catheter, which can maintain the deployed shape of the ablation assembly, provide good adhesion to the focal region, reduce the difficulty of the surgical operation, shorten the surgical time, and reduce the surgical risk.
The embodiment of the specification provides the following technical scheme:
a pulse ablation catheter comprises an ablation assembly, a catheter body assembly and a control handle which are connected in sequence;
the ablation assembly comprises an ablation sleeve, a shaping wire for shaping the ablation sleeve penetrates through the ablation sleeve, the distal end of the shaping wire is connected with the distal end of the ablation sleeve, and a plurality of ring electrodes for releasing pulses are sleeved on the outer surface of the ablation sleeve;
a pull wire penetrates through the tube body assembly, the far end of the pull wire is connected with the near end of the shaping wire, the near end of the pull wire is connected with the control part of the control handle, and the control part moves the pull wire to control the bending degree of the tube body assembly;
the distal end of the shaping wire rotates to be in a ring shape along a preset direction, the proximal end of the shaping wire and the ring shape are located on the same cylindrical surface, and the ablation sleeve is formed into a configuration corresponding to the shape of the shaping wire.
The pulse ablation catheter has the advantages that the shaping wire penetrates through the ablation sleeve, the far end of the shaping wire is rotated and bent to form a ring shape, the shaping wire is located on the same virtual cylindrical surface (namely the side surface of a virtual cylinder) from the near end to the far end of the shaping wire, the ablation sleeve forms an ablation structure which is fixed in shape and stable in structure, the bending of the catheter body component can be controlled through the control part, the ablation component located at the far end of the pulse ablation catheter is driven to move, the ablation component can be well attached to a target ablation area, pulse current is released through the ring electrode on the outer surface of the ablation sleeve, stable attachment can be formed, pulse energy is effectively released, the pulse treatment effect is improved, the pulse ablation catheter is convenient to operate, the operation difficulty of an operation is reduced, the operation time is shortened, and the operation risk is reduced.
The invention also provides a scheme, wherein the shaping wire comprises a straight line segment, a transition segment and an annular ring segment which are sequentially connected from a near end to a far end, wherein the straight line segment is parallel to the axial direction of the cylindrical surface, and the annular ring segment surrounds the cylindrical surface.
The invention also provides a scheme that the shape of the transition section comprises a round angle, and the radius of the round angle is smaller than that of the ablation sleeve.
The invention also provides a scheme that when the distal end of the ablation assembly is rotationally shaped into a ring, the diameter of the ring is more than 3mm and less than 30 mm;
and/or the number of the ring electrodes is 5 to 36.
The present invention also provides a solution where the ring electrode is also used to map electrophysiological signals in a target tissue region.
The invention also provides a scheme, wherein the pipe body assembly comprises an adjustable bending section close to the far end of the pipe body assembly and a main body section close to the near end of the pipe body assembly;
the adjustable bending section comprises a stay wire cavity and a lead wire cavity, the stay wire is positioned in the stay wire cavity, and a lead wire is arranged in the lead wire cavity to be connected with the ring electrode;
wherein the control portion moves the pull wire to control a degree of bending of the adjustable bend section in a radial plane of the pipe body assembly.
The invention also provides a scheme that the near end of the shaping wire is connected with the far end of the pull wire through a connecting piece;
the connecting piece is provided with a fixing part which is abutted and fixed on the far end of the stay wire cavity.
The invention also provides a scheme, a control ring pull wire is further arranged in the ablation sleeve in a penetrating manner, and the adjustable bending section further comprises a control ring pull wire cavity;
the far end of the control ring stay wire is connected with the far end of the shaping wire, and the near end of the control ring stay wire sequentially penetrates through the control ring stay wire cavity and the cavity inside the main body section to be connected with a ring adjusting mechanism in the control handle, so that the size of the ring shape of the far end of the ablation assembly is adjusted under the control of the ring adjusting mechanism.
The invention also provides a scheme, wherein the control part further comprises a fixing clamp and a push button, the fixing clamp is arranged at the near end of the tube body assembly, and the push button is sleeved on the fixing clamp and is in threaded connection with the fixing clamp;
when the push button is rotated in a first direction along the threads, the inner wall of the push button applies an inward radial force to the retaining clip to grip the proximal end of the catheter body assembly.
The invention also provides a scheme that a head electrode is arranged at the far-end vertex of the ablation assembly, and the material of the head electrode comprises platinum-iridium alloy or gold;
or the far-end vertex of the ablation assembly is provided with colloid, and the colloid is in a water drop shape.
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: wear to establish the setting silk in melting the sleeve pipe, form and fix the shape that melts the sleeve pipe through the shape of setting silk for the distal end that melts the sleeve pipe is the bending for the annular, and melts the sleeve pipe and be in a virtual cylinder, thereby forms a stable structure, can adjust the bending degree of body subassembly through brake valve lever simultaneously, and convenient pastes the annular sleeve pipe that melts and lean on in target focus region, uses the ring electrode release pulse energy that melts the sleeve pipe surface, treats. The pulse ablation catheter with the structure can ensure the effects of adhesion and discharge in the operation, reduces the difficulty of adhesion in the operation, reduces the operation difficulty of an operator, is favorable for shortening the operation time and reduces the operation risk.
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 pulse ablation catheter;
FIG. 2 is a schematic perspective view of an ablation assembly of the pulse ablation catheter in an extended state;
FIG. 3 is a schematic perspective view of the shaping wire on the same virtual cylinder;
FIG. 4 is a cross-sectional schematic view of the connection of the adjustable bend section and the main body section;
FIG. 5 is a side schematic view of the control handle;
FIG. 6 is a schematic view of a retainer pin construction;
FIG. 7 is a schematic top view of the ablation assembly in a deflated state (FIG. 7 (a) is a schematic top view of the ablation assembly in an deflated state, and FIG. 7 (b) is a schematic top view of the ablation assembly in a deflated state);
the reference numbers used in the drawings are as follows:
1. ablation subassembly, 101, ablation sleeve pipe, 102, shaping silk, 1021, annular ring section, 1022, changeover portion, 1023, straightway, 103, ring electrode, 2, body subassembly, 201, adjustable curved section, 2011, act as go-between chamber, 2012, wire chamber, 202, main part section, 3, brake valve lever, 301, casing, 302, push-button, 303, push rod, 304, fixation clamp, 4, colloid, 5, connecting piece, 7, screw hole, 8, through-hole.
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. In addition, such an apparatus may be implemented and/or such a method may be practiced using other structure and/or functionality in addition to or other than one or more of the aspects set forth herein.
It should be further noted that the drawings provided in the following embodiments are only schematic illustrations of the basic concepts of the present application, and the drawings only show the components related to the present application rather than the numbers, shapes and dimensions of the components in actual implementation, and the types, the numbers and the proportions of the components in actual implementation may be arbitrarily changed, 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 provide 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, atrial Fibrillation) is one of the most common clinical arrhythmias, and the total incidence rate of Atrial Fibrillation is about 2% as shown by multi-national clinical studies, and the incidence rate of Atrial Fibrillation is gradually increasing in recent years. Non-drug treatment of atrial fibrillation is a research hotspot in recent years, and physicians can treat patients with atrial fibrillation by using an ablation catheter to guide tissue in the left atrial wall of the heart around the ostium of a pulmonary vein.
The pulse ablation is a safe treatment mode, the pulse is released through the pulse ablation catheter, the pulse electric field energy forms irreversible micropores on cell membranes through instantaneous discharge to cause cell apoptosis, and the purpose of treatment is achieved.
During an ablation procedure, an ablation assembly at the distal end of an ablation catheter is placed against a lesion area and pulsed energy is released through a pulse electrode thereon for treatment. Because different focus areas are in different positions and have different shapes, if the device of the ablation component for bearing the electrode cannot be well attached to the target focus area, the ablation electrode cannot be effectively contacted with the tissue surface of the target focus area, ablation energy cannot be effectively transmitted, the treatment effect is greatly reduced, in the actual operation process, an operator needs to repeatedly adjust the angle and the attachment position of the pulse ablation catheter and search the optimal attachment angle and position, the operation difficulty of the operation is increased undoubtedly, particularly when a plurality of target focus areas need to be treated, the operation time is obviously prolonged, and the operation risk is increased.
The inventor of the present invention has made extensive and intensive studies to provide a pulse ablation catheter, wherein an ablation assembly is disposed at a distal end of the pulse ablation catheter, the ablation assembly is an elongated tubular structure, a shaping wire for forming the shape of the ablation assembly is inserted into the ablation assembly, the shaping wire has a predetermined annular shape, so that the ablation assembly is formed into an annular shape identical to the predetermined shape of the shaping wire, and a plurality of annular electrodes are disposed on an outer surface of the ablation assembly. In the operation, when the ablation assembly reaches the focus area accessory, the moving distance of the ablation assembly is controlled by controlling the bending degree of the far end of the tube assembly, so that the annular ablation assembly can be attached to a target focus area, the ablation assembly is in close contact with the target focus area, pulse energy can be conducted, a good treatment effect is achieved, and the operation difficulty of the operation is reduced.
The technical solutions provided by the embodiments of the present application are described below with reference to the accompanying drawings.
The pulse ablation catheter shown in fig. 1 comprises an ablation assembly 1, a catheter body assembly 2 and a control handle 3 which are connected in sequence from the far end to the near end, wherein the control handle 3 is positioned at the near end and is controlled by an operator. The ablation component 1 and the tube body component 2 enter the body of a patient, and the ablation component 1 is used for releasing pulse energy to be attached to a target focus area so as to perform ablation treatment.
As shown in fig. 1 and fig. 2, an ablation assembly 1 is arranged at the distal end of the pulse ablation catheter, namely, at one end facing a target lesion area, the ablation assembly 1 comprises an ablation sleeve 101, a shaping wire 102 is arranged inside the ablation sleeve 101 in a penetrating manner, the distal end of the shaping wire 102 is fixedly connected with the distal end of the ablation sleeve 101, and the shaping wire 102 is used for providing a supporting force, so that the ablation sleeve 101 sleeved outside the shaping wire 102 forms a three-dimensional configuration according to the shape of the shaping wire 102.
The distal end of the shaping wire 102 rotates in a ring shape along a predetermined direction, specifically, as shown in fig. 3, the distal end of the shaping wire rotates in a ring shape along a counterclockwise direction, and the whole shaping wire 102 is located on the same cylindrical surface, which is the side surface of an imaginary cylinder, that is, the proximal end of the shaping wire 102 and the ring shape of the distal end thereof are located on the same imaginary cylindrical surface, so as to form the stable supporting structure. Since the shaping wire 102 is a structure with a distal end rotating into a ring shape, the ablation sheath 101 sleeved outside the shaping wire 102 is also formed into a corresponding shape according to the shape of the shaping wire 102.
It should be noted that the shape-imparting filaments 102 may be made of a resilient memory material.
It is further noted that the distal end of the shaping wire 102 may also be rotated in a clockwise direction into a loop.
It is further noted that the ablation sheath 101 may be made of a medical polymer material, and/or the ablation sheath 101 may be a tubular structure with a single lumen disposed therein.
Preferably, the ablation cannula 101 is a polymeric single lumen tube.
Preferably, the material of the ablation assembly 101 comprises a medical grade polymer material.
As shown in fig. 2, the outer surface of the ablation sheath 101 is sheathed with a plurality of ring electrodes 103, and the ring electrodes 103 are used for releasing pulse energy.
The far end of body subassembly 2 is connected the near-end that melts subassembly 1, wears to be equipped with in the body subassembly 2 and acts as go-between, and the near-end of the distal end of acting as go-between is connected the near-end of setting silk 102, and the near-end of acting as go-between is connected the control part on the control handle 3, the axial back and forth movement along body subassembly 2 can be driven to the control part to drive the far end of body subassembly 2 and take place to deflect, and can control the displacement of acting as go-between through the control part, with the crooked degree of the far end of control body subassembly 2.
Above-mentioned pulse ablation catheter, through wearing to establish the set silk 102 in ablating sleeve pipe 101, the shape through set silk 102 control ablation sleeve pipe 101, make ablation sleeve pipe 101 form a stable loop configuration, the bending degree of body subassembly 2 distal end is adjusted to brake valve lever 3, make ablation subassembly 1 to the regional deflection of target ablation, the annular surface that ablates sleeve pipe 101 is provided with a plurality of ring electrodes 103, be convenient for release ablation energy, thereby constitute a fixed, the ablation structure of easily controlling of shape, can form well with the target ablation region and paste, through predetermined loop configuration, the existing simplification operation steps that do benefit to, reduce the operation degree of difficulty, shorten operation time, also can form enough big ablation contact surface, guarantee treatment.
In some embodiments, as shown in fig. 3, the shaping wire 102 includes a ring section 1021, a transition section 1022, and a straight section 1023, which are connected in sequence, wherein the ring section 1021, the transition section 1022, and the straight section 1023 are on the same cylindrical surface, and the straight section 1023 is parallel to the axial direction of the cylindrical surface, and the ring section 1021 surrounds the cylindrical surface.
In the above embodiment, the straight segments 1023 are used to connect the tube assembly 2, the annular ring segments 1021 are used to form the annular structure of the ablation assembly 1, and the transition segments 1022 are used to absorb the stress of the annular structure against the target lesion area, thereby forming a stable and cushioning ablation structure.
In some embodiments, the fillet radius of the transition section 1022 is set to be smaller than the radius of the ablation sheath 101, thereby avoiding the collapse of the ablation sheath 101 at the transition section 1022.
It is further noted that a larger area loop may be formed by shaping and length the shape wire 102 such that the distal end of the loop section 1021 is closer to the distal end of the straight section 1023, as shown in fig. 3.
In some embodiments, when the distal end of the ablation assembly 1 is rotationally shaped as a ring, the ring has a diameter of 3mm or more and 30mm or less. Wherein the diameter is the diameter of the annulus passing through the axis of the virtual cylinder.
In some embodiments, the number of ring electrodes 103 is 5 or more and 36 or less.
It should be noted that the ring electrode 103 may be disposed on the ablation assembly 1 uniformly or non-uniformly depending on design requirements.
By setting the area of the area for releasing the pulse energy and/or the number of the discharge electrodes, large-area irreversible damage with uniform distribution is formed, the operation of the operation is simplified, the operation efficiency is improved, and the operation intensity of an operator is reduced.
In some embodiments, the ring electrode 103 is also used to map electrophysiological signals in the target tissue region.
Through the functional electrode that possesses intracardiac mark survey and release high-voltage pulse ablation, can reduce and paste the number of times, simplify the operation of operation, improve operation efficiency, alleviate operative employee's manipulation strength.
In some embodiments, as shown in fig. 1 and 4, the tube assembly 2 includes an adjustable bending section 201 and a main body section 202, the adjustable bending section 201 is near the distal end of the tube assembly 2, and the main body section 202 is near the proximal end of the tube assembly 2. The proximal end of the adjustable bend section 201 is fixedly attached to the distal end of the main body section 202 by means including thermal welding, high frequency welding, or glue bonding. The adjustable bending section 201 further includes a wire pulling cavity 2011 and a wire guiding cavity 2012, and both the wire pulling cavity 2011 and the wire guiding cavity 2012 penetrate through both ends of the adjustable bending section 201. A puller wire is located in the puller wire lumen 2011 (not shown) and a lead wire is located in the lead wire lumen 2012 to connect to the ring electrode 103. The control part in the control handle rod 3 controls the bending degree of the adjustable bending section 201 in the radial plane of the tube body assembly 2 by pulling the pull wire, so that the aim of well fitting with the focus is fulfilled.
Preferably, the material of the pull wire is metal.
Preferably, the adjustable bending section 201 is a braided double lumen tube.
Preferably, the body section 202 is a braided single lumen tube.
Preferably, the material of the tube assembly 2 comprises a medical polymer material.
In some embodiments, as shown in fig. 4, the distal end of the tube body assembly 2 is further provided with a connector 5, and specifically, the proximal end of the shaping wire 102 is fixed to a first end of the connector 5, and the distal end of the pull wire is fixed to a second end of the connector 5. Be provided with the fixed part on the connecting piece 5, the distal end at the chamber 2011 of acting as go-between is fixed in the fixed part butt for connecting piece 5 can drive adjustable bending section 201 is crooked. Specifically, when the control portion of the control handle 3 pulls the pulling wire in the direction of the operator, the connecting member 5 pulls the distal end of the pulling wire cavity 2021, so that the bending of the adjustable bending section 201 in the radial plane of the tube assembly 2 can be controlled by controlling the moving distance of the pulling wire 2021, thereby controlling the bending degree of the adjustable bending section 201.
Preferably, the connecting piece 5 is a reducing metal tube. The thick end of the reducing metal tube facing to the far end direction is fixedly connected with the near end of the shaping wire 102, and the thin end of the reducing metal tube facing to the near end direction is fixedly connected with the pull wire. And the thin end is clamped in the wire pulling cavity 2021, at this time, the end face of the thick end facing the proximal direction abuts against the end face of the distal end of the wire pulling cavity 2021, so that the adjustable bending section 201 is driven to bend under the movement of the pulling wire.
In some embodiments, a control loop pull wire is further threaded through the ablation sheath 101, and the adjustable bending section 201 further comprises a control loop pull wire cavity which extends through both ends of the adjustable bending section 201. The far end of the control loop stay wire is fixedly connected with the far end of the shaping wire 102, the near end of the control loop stay wire sequentially penetrates through the control loop stay wire cavity and the cavity inside the main body section 202 to be connected with a loop adjusting mechanism 9 (shown in fig. 5) in the control handle 3, specifically, a fixed wheel coaxially arranged with the control handle 3 is arranged inside the loop adjusting mechanism 9, the control loop stay wire is wound on the fixed wheel, and the near end of the control loop stay wire is loosened or tightened through the left-right rotation of the loop adjusting mechanism 9, so that the far end of the control loop stay wire is driven to move. When the proximal end of the control loop pull wire is tightened, the distal end of the control loop pull wire moves in the proximal direction, and the distal end of the ablation assembly 1 is annularly reduced (as shown in fig. 7); when the proximal end of the control loop pulling wire is released, the distal end of the control loop pulling wire moves to the distal direction under the restoring force of the shaping wire 102, the shaping wire restores to the preset shape, and the distal ring of the ablation assembly 1 expands to the preset size.
By arranging the ablation assembly 1 with the size capable of being adjusted, the area of the ablation assembly 1 can be adjusted according to the shape and the area of a focus area, the purpose of being well attached to the focus is achieved, and the operation difficulty of an operation is reduced.
In some embodiments, the housing 301 of the control handle 3 shown in fig. 5 is provided with a through hole 8, and the through hole 8 is embedded with a fixing pin (shown in fig. 6). When the near end of the stay wire is fixed, the near end of the stay wire firstly passes through the mounting through hole which is arranged in the fixing pin along the radial direction of the fixing pin, and then is wound on the outer surface of the fixing pin. The installation through holes can be chamfered at two ends of the outer surface of the fixing pin so as to prevent the stay wire from being broken by shearing force.
In some embodiments, as shown in fig. 6, the end surface of the fixing pin facing the outer surface of the control handle 3 is further provided with a groove, and the tightening degree of the pull wire can be adjusted by using a screwdriver to clamp and rotate the fixing pin in the groove.
It should be noted that the outer surface of the fixing pin may be provided with an external thread, the inner wall of the through hole 8 on the casing 301 is provided with an internal thread matching the external thread, and the fixing pin is in threaded connection with the through hole 8.
In some embodiments, as shown in fig. 5, the control portion further includes a fixing clip 304, a push rod 303, and a push button 302, the fixing clip 304 is disposed at a proximal end of the catheter body assembly 2 (such as a proximal end of the main body section 202 shown in fig. 5), a proximal end of the fixing clip 304 is embedded in a distal end of the push rod 303, an outer wall of the fixing clip 304 is provided with an external thread, an inner wall of the push button 302 is provided with an internal thread matching the external thread on the fixing clip 304, and the push button 302 is in threaded connection with the fixing clip 304. When the push button 302 is threaded in a first direction, the inner wall of the push button 302 applies an inward radial force to the retaining clip 304 to grip the proximal end of the tube assembly 2, which compresses the pull wires inward against the proximal end of the tube assembly 2 to secure the pull wires. When the push button 302 is rotated in a direction opposite to the first direction, the radial force on the retaining clip 304 is released, and the tube assembly 2 releases the pull wire, which is free to move.
In some embodiments, the push rod 303 is provided with a sliding groove, the sliding groove is connected with the threaded hole 7 on the housing 301 through a screw head, and the length of the sliding groove determines the pushing stroke of the push rod 303.
In some embodiments, the distal apex of the ablation assembly 1 is provided with a tip electrode of a material comprising platinum iridium or gold. The tip electrode is used to release pulsed energy and/or to map electrophysiological signals in a target tissue region. By positioning the tip electrode, the distal-most end of the ablation assembly participates in delivering the pulse or mapping.
In some embodiments, as shown in fig. 2, the distal tip of the ablation assembly 1 is provided with gel 4, and the gel 4 is in the form of drops.
Preferably, the colloid 4 is made of medical materials.
By arranging the water-drop colloid, the intracardiac tissue is protected from being scratched and scratched.
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 (10)
1. A pulse ablation catheter is characterized by comprising an ablation assembly, a catheter body assembly and a control handle which are connected in sequence;
the ablation assembly comprises an ablation sleeve, a shaping wire for shaping the ablation sleeve penetrates through the ablation sleeve, the distal end of the shaping wire is connected with the distal end of the ablation sleeve, and a plurality of ring electrodes for releasing pulses are sleeved on the outer surface of the ablation sleeve;
a pull wire penetrates through the tube body assembly, the far end of the pull wire is connected with the near end of the shaping wire, the near end of the pull wire is connected with the control part of the control handle, and the control part moves the pull wire to control the bending degree of the far end of the tube body assembly;
the distal end of the shaping wire rotates to be in a ring shape along a preset direction, the proximal end of the shaping wire and the ring shape are located on the same cylindrical surface, and the ablation sleeve is formed into a configuration corresponding to the shape of the shaping wire.
2. The pulse ablation catheter according to claim 1, wherein the shaping wire comprises a straight section, a transition section and an annular ring section which are connected in sequence from the proximal end to the distal end, wherein the straight section is parallel to the axial direction of the cylindrical surface, and the annular ring section surrounds the cylindrical surface.
3. The pulse ablation catheter of claim 2, wherein the shape of the transition section comprises a rounded corner having a radius that is less than a radius of the ablation sheath.
4. The pulse ablation catheter of claim 1, wherein when the distal end of the ablation assembly is rotationally shaped as a ring, the ring has a diameter of 3mm or more and 30mm or less;
and/or the number of the ring electrodes is 5 to 36.
5. The pulse ablation catheter of claim 1, wherein the loop electrode is further configured to map electrophysiological signals in a target tissue region.
6. The pulse ablation catheter of claim 1, wherein the tube assembly comprises an adjustable bend section proximate a distal end of the tube assembly and a main body section proximate a proximal end of the tube assembly;
the adjustable bending section comprises a stay wire cavity and a lead wire cavity, the stay wire is positioned in the stay wire cavity, and a lead wire is arranged in the lead wire cavity to be connected with the ring electrode;
wherein the control portion moves the pull wire to control a degree of bending of the adjustable bend section in a radial plane of the pipe body assembly.
7. The pulse ablation catheter of claim 6, wherein a proximal end of the shaping wire is connected to a distal end of the pull wire by a connector;
the connecting piece is provided with a fixing part which is abutted and fixed at the far end of the stay wire cavity.
8. The pulse ablation catheter according to claim 6, wherein a control loop pull wire is further arranged in the ablation sleeve in a penetrating mode, and the adjustable bending section further comprises a control loop pull wire cavity;
the far end of the control ring stay wire is connected with the far end of the shaping wire, and the near end of the control ring stay wire sequentially penetrates through the control ring stay wire cavity and the cavity inside the main body section to be connected with a ring adjusting mechanism in the control handle, so that the size of the ring shape of the far end of the ablation assembly is adjusted under the control of the ring adjusting mechanism.
9. The pulse ablation catheter of claim 1, wherein the control portion further comprises a retaining clip, a push rod, and a push button; the fixing clamp is arranged at the near end of the tube body assembly and sleeved at the far end of the push rod, and the push button is in threaded connection with the fixing clamp;
when the push button is rotated in a first direction along the threads, the inner wall of the push button applies an inward radial force to the retaining clip to grip the proximal end of the catheter body assembly.
10. The pulse ablation catheter according to claim 1, wherein the distal apex of the ablation assembly is provided with a tip electrode, the tip electrode being made of a material comprising platinum-iridium alloy or gold;
or the vertex of the far end of the ablation assembly is provided with colloid, and the colloid is in a drop shape.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210938742.3A CN115363736A (en) | 2022-08-05 | 2022-08-05 | Pulse ablation catheter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210938742.3A CN115363736A (en) | 2022-08-05 | 2022-08-05 | Pulse ablation catheter |
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| CN116616891A (en) * | 2023-06-13 | 2023-08-22 | 上海玮启医疗器械有限公司 | Ablation catheter and ablation device |
| CN116983077A (en) * | 2023-07-06 | 2023-11-03 | 上海玮启医疗器械有限公司 | Pulse ablation catheter capable of realizing multistage bending adjustment |
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Application publication date: 20221122 |