CN113729924A - Electrode catheter and ablation apparatus - Google Patents
Electrode catheter and ablation apparatus Download PDFInfo
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- CN113729924A CN113729924A CN202111162744.XA CN202111162744A CN113729924A CN 113729924 A CN113729924 A CN 113729924A CN 202111162744 A CN202111162744 A CN 202111162744A CN 113729924 A CN113729924 A CN 113729924A
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- A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
- A61B18/04—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by heating
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- A61B18/14—Probes or electrodes therefor
- A61B18/1492—Probes or electrodes therefor having a flexible, catheter-like structure, e.g. for heart ablation
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- 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
- A61B2018/00577—Ablation
Abstract
The present disclosure relates to an electrode catheter and an ablation apparatus, the electrode catheter including: a rear end control part and a front end support part respectively provided at both ends of the electrode catheter, the front end support part being configured as a front end free end of the electrode catheter; an inner tube extending at least between the leading end support portion and the trailing end control portion and configured to define a shape of the electrode catheter; an outer tube coated outside the inner tube; an electrode arm disposed between the inner tube and the outer tube and comprising at least three electrode arms, each electrode arm comprising at least one electrode portion and a distal end of the electrode arm being fixedly connected to the inner tube by a front end support and extending between the front end support and a rear end control; and at least one part of each electrode arm is suitable for switching between a first state which is linear and a second state which is arc under the control of the rear end control part, and the electrode arm adjusting part is connected with at least one electrode arm so as to adjust the extending state of the electrode arm.
Description
Technical Field
The present disclosure relates to the field of medical devices, and more particularly, to an electrode catheter and ablation device.
Background
Atrial Fibrillation (AF) is a common cardiac arrhythmia affecting the lives of over 3300 million people worldwide. Radiofrequency ablation and cryoablation are two common methods currently used clinically to treat cardiac arrhythmias such as atrial fibrillation. Both types of ablation must be sufficiently damaging to the arrhythmic tissue or to substantially interfere with or isolate abnormal electrical conduction in the myocardial tissue, while excessive ablation may affect surrounding healthy tissue as well as neural tissue, but insufficient ablation may not serve to block abnormal electrical conduction. Therefore, it is critical to produce a suitable ablation zone.
The radio frequency ablation adopts point-by-point ablation, the operation time is long, the requirement on the catheter operation level of an operator (such as a doctor) is high, discomfort can be caused due to the long time during the operation of a patient, and the problems of pulmonary vein stenosis and the like easily occur after the operation. In addition, radiofrequency ablation can damage the cardiac endothelial surface, activate the extrinsic coagulation cascade and lead to coke and thrombosis, which in turn can lead to systemic thromboembolism. It follows that the application of radio frequency energy to target tissue can have an effect on non-target tissue, for example, the application of radio frequency energy to atrial wall tissue can cause damage to the digestive system, such as the esophagus, or the nervous system. Radiofrequency ablation may also lead to scarring of the tissue, further leading to embolization problems. Cryoablation has a high probability of causing phrenic nerve damage, and epicardial freezing near the coronary arteries can also lead to thrombosis and progressive coronary stenosis.
The head end of the currently known pulse ablation electrode catheter mainly adopts an integral flexible electrode arm, most of which is in a single arc shape, a basket shape, a flower shape or a cage shape, but the electrode catheters in the forms generally have the following defects that the electrode catheter products are not well attached to target positions and are easy to deform in vivo, so that multiple ablations are needed to achieve a good effect, and the operation time is prolonged.
Disclosure of Invention
In view of the deep understanding of the problems in the background art, that is, the existing electrode catheter is not well attached to the target site and is easily deformed in the body, so that multiple ablations are required to achieve a good effect, which inevitably prolongs the operation time, the inventor of the present disclosure proposes an electrode catheter and an ablation apparatus in the present case, and specifically, a first aspect of the present disclosure proposes an electrode catheter which can be used to specifically adjust the extending state of the corresponding electrode arm, the electrode catheter comprising:
a leading end support configured as a leading end free end of the electrode catheter;
a rear end control part, the rear end control part and the front end support part being respectively provided at both ends of the electrode catheter;
an inner tube extending at least between the leading end support and the trailing end control and configured to define a shape of the electrode catheter;
the outer pipe is coated outside the inner pipe;
an electrode arm disposed between the inner tube and the outer tube and comprising at least three electrode arms, wherein each of the at least three electrode arms comprises at least one electrode portion and distal ends of the at least three electrode arms are fixedly connected with the inner tube by the leading end support and extend between the leading end support and the trailing end control; and
an electrode arm adjusting part is arranged on the electrode arm,
and wherein at least a portion of each of the at least three electrode arms is adapted to switch between a first state, which assumes a linear shape, and a second state, which assumes an arc shape, under the control of the rear end control section, and wherein the electrode arm adjustment section is connected with at least one electrode arm to adjust the extended state of the at least one electrode arm.
By means of the electrode arm adjusting part provided according to the disclosure, the extension state of the corresponding electrode arm can be adjusted in a targeted manner, so that the extension amount of the adjusted electrode arm can be different from the extension amounts of other electrode arms which are not adjusted, and further, the ablation region of the electrode catheter provided according to the disclosure can be adjusted in a targeted manner based on the specific form of the target tissue, thereby achieving a better ablation effect.
Preferably, in one embodiment according to the present disclosure, the electrode arm further includes:
an inner core;
a wire routed along an axial direction of the inner core;
an insulating sleeve covering the inner core and the wire;
wherein the electrode portion is arranged outside the insulating sleeve, and the lead is connected to the electrode portion at the electrode portion through the insulating sleeve.
In this way, a large part of the electrode arm can be insulated and only the parts that need to be provided with electrode parts for discharge are energized, which are in the position where the pulsed shock treatment is actually carried out. In order to ensure that the electrode section is supplied with electricity precisely, the conductor is connected to the electrode section at the electrode section through the insulating sleeve.
Preferably, in one embodiment according to the present disclosure, the inner core is made of a memory material or a medical stainless steel material.
Preferably, in one embodiment according to the present disclosure, the electrode arm adjusting part is configured to be fixedly connected with the corresponding electrode arm. Therefore, the electrode arm connected with the electrode arm adjusting part can be adjusted under the action of the electrode arm adjusting part so as to adjust an ablation area formed by the electrode arm at the front end, and achieve a better ablation effect.
Preferably, in one embodiment according to the present disclosure, the electrode arm adjusting part is configured to be movable between a first position and a second position to be selectively connected with a first electrode arm of the at least three electrode arms at the first position or connected with a second electrode arm of the at least three electrode arms at the second position.
In this way, for example, a plurality of electrode arms can share one electrode arm adjusting part, and when a specific electrode arm in the plurality of electrode arms needs to adjust the extension amount thereof, the electrode arm adjusting part can be rotated or translated, for example, and can be mechanically connected with another electrode arm when rotated or translated to a new position, so as to adjust the extension amount of the newly connected electrode arm.
Preferably, in one embodiment according to the present disclosure, the electrode arm adjusting part is configured to be mechanically connected with at least two electrode arms. In this way, the electrode arms can be adjusted simultaneously by one electrode arm adjusting part, and the efficiency of adjusting the ablation regions formed by the electrode arms can be improved.
Further preferably, in an embodiment according to the present disclosure, the electrode arm adjusting part is configured to be mechanically connected with the at least two electrode arms via transmission members having different transmission ratios. In this way, it is possible to achieve both the technical effect of simultaneously adjusting a plurality of electrode arms by the same electrode arm adjusting portion and the adjustment of different extension amounts of the plurality of electrode arms.
Preferably, in one embodiment according to the present disclosure, the electrode arm adjusting part is configured as an electrode arm push-pull, and the electrode arm push-pull comprises:
a card slot provided on a surface of the rear end control portion; and
a clip connected with the corresponding electrode arm and disposed in the card slot.
Preferably, in one embodiment according to the present disclosure, an outer tube side cavity is formed in the annular wall of the outer tube, the outer tube side cavity being configured to receive the electrode arm. In this way, an effective accommodation and a better protection of the electrode arm can be achieved, reducing the possibility of failure of the electrode arm.
Preferably, in one embodiment according to the present disclosure, the backend control section includes:
an inner tube push-pull configured to drive the inner tube back and forth along the longitudinal extent of the electrode catheter.
In this way, the front-end electrode arm can be switched between the first state in which it is linear and the second state in which it is arcuate.
Preferably, in one embodiment according to the present disclosure, the electrode catheter further includes:
a sensor configured to detect a bonding state of the respective electrode portions with the target object.
In this way, it can be determined which or which electrode arm needs to be finely adjusted, on the basis of which the corresponding electrode arm is found and the extension of the corresponding electrode arm is adjusted by means of the electrode arm adjusting part, so that a more effective ablation region and thus a better ablation effect are achieved.
Preferably, in one embodiment according to the present disclosure, the electrode catheter further includes a prompt device configured to generate a prompt signal based on the fitting state.
Furthermore, a second aspect of the present disclosure proposes an ablation apparatus characterized in that it comprises:
a pulse signal generator configured to generate a pulse signal; and
the electrode catheter according to the first aspect of the present disclosure, an electrode of the electrode catheter being electrically connected with an output of the pulse signal generator.
In summary, the electrode arm adjusting portion provided according to the present disclosure can adjust the extending state of the corresponding electrode arm in a targeted manner, so that the extending amount of the adjusted electrode arm can be different from the extending amounts of other non-adjusted electrode arms, and further the electrode arm of the electrode catheter provided according to the present disclosure can be adjusted in a targeted manner based on the specific form of the target tissue, so as to be attached to the target tissue in different forms well, thereby achieving a better ablation effect.
Drawings
Embodiments are shown and described with reference to the drawings. These drawings are provided to illustrate the basic principles and thus only show the aspects necessary for understanding the basic principles. The figures are not to scale. In the drawings, like reference numerals designate similar features.
FIG. 1 shows a schematic side view of the front end of an electrode catheter 100 according to one embodiment of the prior art;
FIG. 2 shows a schematic forward view of the forward end of the electrode catheter 100 of the embodiment of FIG. 1 in accordance with the prior art;
FIG. 3 shows a schematic side view of the leading end of an electrode catheter 300 with at least a portion of the electrode arms having different amounts of extension in accordance with one embodiment of the present disclosure;
FIG. 4 shows a schematic forward view of the forward end of the electrode catheter 300 of the embodiment of FIG. 3 in accordance with the present disclosure;
fig. 5 illustrates a schematic view of an electrode arm adjusting part 511 according to an embodiment of the present disclosure;
fig. 6A illustrates a schematic diagram of the entirety of the back end control part 510 having the electrode arm adjusting part 511 of fig. 5 according to one embodiment of the present disclosure;
fig. 6B illustrates a schematic view of the rear end control part 610 having the electrode arm adjusting part 511 of fig. 5 according to another embodiment of the present disclosure;
fig. 7A illustrates a partially enlarged schematic view of an electrode arm adjustment part when being connected with an electrode arm according to an embodiment of the present disclosure;
fig. 7B is a partially enlarged schematic view illustrating a plurality of electrode arms when an electrode arm adjusting part according to another embodiment of the present disclosure is connected;
fig. 8 is a partially enlarged schematic view illustrating a state where the snaps 8111 of the electrode arm adjustment part 811 are connected with a plurality of electrode arms according to still another embodiment of the present disclosure;
FIG. 9 illustrates a front end elevation view of an extended state of an electrode catheter in accordance with the present disclosure;
fig. 10 shows a schematic view of an electrode catheter 1000 according to the present disclosure.
Other features, characteristics, advantages and benefits of the present disclosure will become more apparent from the following detailed description taken in conjunction with the accompanying drawings.
Detailed Description
In the following detailed description of the preferred embodiments, reference is made to the accompanying drawings, which form a part hereof. The accompanying drawings illustrate, by way of example, specific embodiments in which the disclosure can be practiced. The example embodiments are not intended to be exhaustive of all embodiments according to the disclosure. It is to be understood that other embodiments may be utilized and structural or logical changes may be made without departing from the scope of the present disclosure. The following detailed description is, therefore, not to be taken in a limiting sense, and the scope of the present disclosure is defined by the appended claims.
The technique used in this disclosure to treat atrial fibrillation is a pulsed electric field technique that applies brief high voltages to the target tissue cells that can produce local high voltage electric fields of several hundred volts per centimeter. The local high voltage electric field destroys the cell membrane by forming a puncture in the cell membrane where the applied electric field is above the cell threshold so that the puncture does not reclose, thereby making such electroporation irreversible. The perforation will allow the exchange of biomolecular material across the cell membrane, resulting in necrosis or apoptosis of the cell.
Since different tissue cells have different voltage penetration thresholds, the high voltage pulse technique can selectively treat myocardial cells with relatively low thresholds without affecting other non-target cell tissues, such as nerve cells, esophageal cells, vascular cells, and blood cells. Meanwhile, the time for releasing energy is very short, so that the pulse electric field technology cannot generate obvious thermal effect, and the problems of tissue damage, pulmonary vein stenosis and the like are avoided.
In particular, pulsed electric field (PET) ablation is a non-thermal damage technique, the damage mechanism being the appearance of nano-scale pores in certain cell membranes by high frequency electrical pulses. Potential advantages of the PET ablation technique that can be used for atrial fibrillation ablation include the following: firstly, the PET ablation technology can pertinently select or avoid target tissues by setting different threshold values, so that surrounding tissues can be protected from being damaged; secondly, the PET ablation technology can be rapidly released within a few seconds, namely the treatment time of the cells of the target tissue is short, and the cells are easy to accept by a user; furthermore, compared to cryoablation, PET ablation does not produce coagulation necrosis, thereby reducing the risk of Pulmonary Vein (PV) stenosis.
Fig. 1 shows a side view schematically illustrating the front end of an electrode catheter 100 according to one embodiment of the related art, and fig. 2 shows a front view schematically illustrating the front end of the electrode catheter 100 according to the embodiment of fig. 1 of the related art. As can be seen from fig. 1 and 2, the electrode catheter 100 of the prior art includes a front end support 110, an inner tube 120, an outer tube 130, and electrode arms 140, each of the electrode arms 140 has at least one electrode portion 142, and the electrode arms 140 extend to the same length, so that they must be attached to regular tissues, but have a poor effect on irregularly shaped tissues.
In view of the deep understanding of the problems in the background art, that is, the conventional electrode catheter 100 is not well attached to the target site and is easily deformed in the body, so that multiple ablations are required to achieve good results, thereby prolonging the operation time, the inventor of the present disclosure proposes an electrode catheter 300 capable of adjusting the extension state of the corresponding electrode arm.
Specifically, fig. 3 shows a side schematic view of the front end of an electrode catheter 300 according to an embodiment of the present disclosure with at least a portion of the electrode arms having different amounts of extension, while fig. 4 shows a front schematic view of the front end of the electrode catheter 300 according to the embodiment of fig. 3 of the present disclosure.
As can be seen from fig. 3 and 4, a first aspect of the present disclosure proposes an electrode catheter 300, the electrode catheter 300 including a front end support 310, a rear end control portion (not shown in fig. 3, see fig. 10), an inner tube 320, an outer tube 330, electrode arm portions 340 and 340', and an electrode arm adjustment portion (not shown in fig. 3 and 4, which will be described in detail later with reference to fig. 6A and 6B). Wherein the front end support 310 is configured as a front end free end of the electrode catheter 300, the rear end control part and the front end support 310 are respectively disposed at both ends of the electrode catheter 300, the inner tube 320 extends at least between the front end support 310 and the rear end control part and is configured to define a shape of the electrode catheter 300, and the outer tube 330 is wrapped outside the inner tube 320; the electrode arm portion (arc-shaped portion in the figure) is arranged between the inner tube 320 and the outer tube 330 and comprises at least three electrode arms (e.g. electrode arms 340 and 340'), wherein each of the at least three electrode arms 340 and 340' (e.g. electrode arm 340 or electrode arm 340') comprises at least one electrode portion 342 and 342' and the distal ends of the at least three electrode arms are fixedly connected with the inner tube 320 by the front end support 310 and extend between the front end support 310 and the rear end control portion, and wherein at least a part of each of the at least three electrode arms 340 or 340' is adapted to switch between a first state assuming a linear shape and a second state assuming an arc-shaped shape under the control of the rear end control portion, and wherein the electrode arm adjustment portion is connected with at least one electrode arm, to adjust the extension state of the at least one electrode arm. By means of the electrode arm adjusting part provided according to the present disclosure, the corresponding extension state of, for example, the electrode arm 340 'can be adjusted in a targeted manner, so that the extension amount of the adjusted electrode arm 340' can be different from the extension amounts of the other electrode arms 340 that are not adjusted, and further, the electrode arm of the electrode catheter 300 provided according to the present disclosure can be adjusted in a targeted manner based on the specific form of the target tissue, so as to be attached to the target tissue in different forms well, thereby achieving a better ablation effect.
For example, as can be seen from fig. 3 and 4, the extension amount of the electrode arm 340 'is significantly larger than that of the electrode arm 340, and in this case, for example, in the case that the extension amount of the electrode arm 340' before being adjusted by the electrode arm adjusting part fails to be well attached to the corresponding target tissue, the extension amount of the electrode arm 340 'can be adjusted by the electrode arm adjusting part proposed according to the present disclosure until the electrode arm 340' is well attached to the target tissue. Here, preferably, the electrode arm includes: an inner core; a wire routed along an axial direction of the inner core; an insulating sleeve covering the inner core and the wire; and an electrode portion disposed outside the insulating sleeve, wherein the lead is connected to the electrode portion at the electrode portion through the insulating sleeve. The inner core can be made of memory alloy or medical stainless steel material or other suitable materials; the section of the wire can be circular or rectangular; the electrode ring is made of platinum or platinum iridium, the length can be between 1mm and 10mm, the thickness can be between 0.01mm and 0.1mm, and the number of the electrode parts on each electrode arm 340 can be between 6 and 12; the material of the inner tube 320 and the outer tube 330 can be selected from PEBAX, TPU, Nylon and other suitable materials, and the size of the outer tube 330 can be 8-15F; the inner tube 320 is a guide wire channel, and both the inner tube 320 and the outer tube 330 can be braided with stainless steel to provide support strength. The maximum outer diameter of the electrode arm 340 is 1mm to 2mm, the working diameter of the electrode arm 340 after being unfolded may be 10mm to 20mm, and the working diameter of the second electrode arm 340, such as a circular arc-shaped electrode arm, may be 20mm to 30 mm; possible attachment means are gluing, hot melting, welding and the like. In this way, a large part of the electrode arm can be insulated and only the parts that need to be provided with electrode parts for discharge are energized, which are in the position where the pulsed shock treatment is actually carried out. In order to ensure that the electrode section is supplied with electricity precisely, the conductor is connected to the electrode section at the electrode section through the insulating sleeve.
Preferably, in one embodiment according to the present disclosure, the inner core is made of a memory material or a medical stainless steel material. More preferably, in an embodiment according to the present disclosure, the memory material includes a memory alloy, which exhibits a circular arc shape in a normal state, i.e., without being constrained by an external force, and is pulled into a linear shape when being pulled by an external force. Of course, it will be understood by those skilled in the art that the memory alloy can be, for example, in a linear shape in a normal state, i.e., without being constrained by an external force, and can be, for example, manipulated into a circular arc shape when pulled by an external force.
In order to realize the function of the electrode arm adjusting part, a possible implementation form of the electrode arm adjusting part proposed according to the present disclosure will be described below with the aid of fig. 5 to 8. Wherein, fig. 5 shows a schematic view of the electrode arm adjusting part 511 according to an embodiment of the present disclosure. As can be seen from fig. 5, the electrode arm adjusting part 511 is configured as an electrode arm push-pull 511, and the electrode arm push-pull 511 includes: a catching groove 5112, the catching groove 5112 being provided on the surface of the rear end control portion so that an operator can smoothly contact and operate the electrode arm push-pull 511. In addition, the electrode arm push-pull device 511 further comprises a buckle 5111, and the buckle 5111 is connected with the corresponding electrode arm and is arranged in the clamping groove 5112. As can be seen from fig. 5, the latch 5111 can move relative to the latch 5112, so that the portion mechanically connected to the latch 5111 moves, and then the electrode arm indirectly connected to the latch 5111 is pushed to move forward or backward, so as to adjust the ablation region of the electrode catheter as a whole, and achieve better ablation effect.
Fig. 5 merely shows a specific embodiment of the electrode arm push-pull 511, and how it is connected to the rear control part will be described with reference to fig. 6A and 6B. Fig. 6A illustrates a schematic diagram of the entirety of the back end control part 510 having the electrode arm adjusting part 511 of fig. 5 according to one embodiment of the present disclosure. As can be seen from fig. 6A, the back end control portion 510 can have, for example, a plurality of electrode arm push-pull devices 511, each electrode arm push-pull device 511 being, for example, mechanically connectable to one or more electrode arms, so that the extension of the respective electrode arm can be controlled by means of the electrode arm push-pull device 511. For example, it will be appreciated by those skilled in the art that each electrode arm push-pull 511, 511' may be configured to mechanically couple to only one electrode arm, which is advantageous in that the amount of extension of each electrode arm may be individually controlled to allow precise adjustment of the ablation region. Correspondingly, each electrode arm push-pull device 511 can be only mechanically connected with a plurality of electrode arms (for example, three electrode arms at the same time), so that the advantage is that the extension of the electrode arms connected with the electrode arm push-pull device can be adjusted at the same time, and the adjustment efficiency is improved. In addition, as can be seen from fig. 6A, the rear end control portion 510 can further include a bending adjustment knob 512, and the bending adjustment knob 512 can control the deflection direction of the electrode catheter connected thereto, such as upward deflection or downward deflection.
Fig. 6B illustrates a schematic diagram of the rear end control part 610 having the electrode arm adjusting part 511 of fig. 5 according to another embodiment of the present disclosure. As can be seen from fig. 6B, the rear control unit 610 can have, for example, an electrode arm push-pull 511, which electrode arm push-pull 511 can, for example, be mechanically connected to only one electrode arm at a time, so that the extension of the electrode arm connected to it at that time can be controlled by means of the electrode arm push-pull 511. Although there is only one electrode arm push-pull device 511, since the electrode arm push-pull device 511 can rotate along the surface of the rear end control portion 610, for example, on the area 5110 of the rear end control portion 610, so as to reach different positions before and after the rotation, and connect with different electrode arms at different positions, the technical purpose that a plurality of electrode arms share one electrode arm push-pull device 511 is achieved, the structure of the electrode catheter product is simplified, and the cost of the electrode catheter product is reduced. For example, it will be appreciated by those skilled in the art that when the electrode arm push-pull 511 is rotated to a position, the electrode arm push-pull 511 can be connected to a corresponding portion of the electrode arm proximate to the electrode arm push-pull 511, for example, by means of the attractive effect of a magnet, for subsequent driving purposes. In addition, as can be seen from fig. 6B, the rear control portion 610 can further include a bending knob 612, and the bending knob 512 can control the deflection direction of the electrode catheter connected thereto, such as upward deflection or downward deflection.
How to achieve the mechanical connection of the electrode arm push-pull 511 to a single or multiple electrode arms is described below in connection with fig. 7A and 7B. Fig. 7A illustrates a partially enlarged schematic view when the electrode arm adjustment part 711 is connected to the electrode arm according to one embodiment of the present disclosure. As can be seen from fig. 7A, the electrode arm adjusting part 711 is configured as an electrode arm push-pull comprising: a catch 7112, said catch 7112 being provided on the surface of said rear control portion to allow an operator to smoothly access and operate the electrode arm push-pull. In addition, the electrode arm push-pull device further comprises a buckle 7111, and the buckle 7111 is connected with the corresponding electrode arm and is arranged in the clamping groove 7112. As can be seen in fig. 7A, the latch 7111 can move relative to the latching slot 7112, such that the portion mechanically coupled to the latch 7111 (e.g., the region where the screw 7113 is located) moves, thereby pushing the electrode arm 740 indirectly coupled to the latch 7111 to move forward or backward, so as to make good contact with different forms of target tissues, and achieve better ablation effect.
Fig. 7B is a partially enlarged schematic view illustrating a state where an electrode arm adjusting part according to another embodiment of the present disclosure is connected to a plurality of electrode arms. As can be seen from fig. 7B, the electrode arm adjusting part is configured as an electrode arm push-pull, which includes: a catch 7112' is provided on the surface of the rear control portion to allow an operator to smoothly access and operate the electrode arm push-pull. The electrode arm push-pull further comprises a catch 7111', which catch 7111' is connected to the respective electrode arm (here, for example, simultaneously with the three electrode arms 740', 740 "' by means of screws 7113', 7113" ') and is arranged in the latching groove 7112 '. As can also be seen in fig. 7B, the clip 7111 'can move relative to the locking slot 7112' so as to move the portion mechanically connected to the clip 7111 '(e.g., the region where the screws 7113', 7113 "'are located), thereby pushing the three electrode arms 740', 740" 'indirectly connected to the clip 7111' forward or backward to make good contact with different forms of target tissue for better ablation. This makes it possible to adjust the extension of the three electrode arms 740', 740' simultaneously by means of one electrode arm push-pull. It should be understood by those skilled in the art that the three electrode arms 740', 740 ", 740'" are exemplary only and not limiting, and that one electrode arm push-pull can be provided in connection with two or more electrode arms.
The electrode arms connected with the electrode arm push-pull devices can only simultaneously adjust the same stretching amount, but cannot realize the adjustment of different stretching amounts. In order to better illustrate technical details of how the buckles 8111 in fig. 8 realize adjustment of different stretching amounts, the clamping grooves of the electrode arm adjusting portion 811 are omitted in fig. 8, and only the buckles 8111 are illustrated, specifically, fig. 8 illustrates a partially enlarged schematic view when the buckles 8111 of the electrode arm adjusting portion 811 are connected with a plurality of electrode arms according to yet another embodiment of the present disclosure. As can be seen from fig. 8, the electrode arm adjusting portion is configured as an electrode arm push-pull 811, the electrode arm push-pull 811 includes at least one buckle 8111, the buckle 8111 has two protruding portions 8112 and 8113 extending toward the electrode arm, a driving structure such as a driving rack 8119 is disposed in the two protruding portions, the movement of the buckle 8111 is transmitted to the rotating shaft 8114 through the driving of the driving rack 8119, so as to drive the rotating shaft 8114 to rotate, and the rotating shaft 8114 is connected with the corresponding electrode arm (here, for example, simultaneously connected with three electrode arms (not shown in the figure) through gears of different sizes, so as to push the three electrode arms indirectly connected with the buckle 8111 to move forward or backward, so as to make good contact with target tissues of different shapes, and achieve better ablation effect. The embodiment disclosed in fig. 8 is peculiar in that in fig. 8 different gear ratios can be achieved by means of the meshing of the gear and the rack, so that different displacements of the rack 8118 and thus different extensions of the three electrode arms connected to the rack 8118 are achieved. Specifically, when the rotation shaft 8114 rotates by a certain angle, the radius of the intermediate gear 8116 is maximized, and therefore the displacement amount of the rack connected to the gear 8116 is maximized. Accordingly, since the radii of the gears 8115 and 8117 are smaller than the radius of the gear 8116, the amount of displacement of the rack connected to the gears 8115 and 8117 is smaller than the amount of displacement of the rack connected to the gear 8116, and thus the amount of extension of the electrode arm indirectly connected to the gears 8115 and 8117 is smaller than the amount of extension of the electrode arm connected to the gear 8116. This makes it possible to adjust the different extension amounts of the three electrode arms simultaneously by means of an electrode arm push-pull. It should be understood by those skilled in the art that the three electrode arms are merely exemplary and not limiting, and that one electrode arm push-pull can be connected to two or more electrode arms.
In a preferred embodiment, the electrode arm adjusting part capable of adjusting the different extension amounts of the plurality of electrode arms simultaneously is configured to be capable of rotating around the axial direction of the rear end control part so as to reach different positions before and after rotation, and is connected with different electrode arms at different positions, thereby achieving the technical purpose that the electrode arms share one electrode arm push-pull device.
Fig. 9 illustrates a front end elevation view of an extended state of an electrode catheter in accordance with the present disclosure. This front end elevation can be achieved, for example, by means of the electrode arm push-pull 811 shown in fig. 8. In particular, for example, the electrode arms 940', 940 "' can be indirectly connected to the gears 8116, 8115 and 8117, respectively, whereby the extension of the electrode arm 940 'can be maximally adjusted, whereas the extension of the electrode arms 940" and 940 "' is less than that.
Fig. 10 shows a schematic view of an electrode catheter 1000 according to the present disclosure. As can be seen in fig. 10, the electrode catheter 1000 includes at least an outer tube 1030, an electrode arm 1040, and a rear control portion 1050, which rear control portion 1050 can include an electrode arm adjustment portion 1051, a bending knob 1052, and an inner tube push-pull 1053, which inner tube push-pull 1053 is configured to drive the inner tube back and forth along the longitudinal direction of the electrode catheter 1000. In this way, the leading electrode arm portion 1040 can be switched between the first state in which it appears linear and the second state in which it appears arc-shaped. Preferably, an outer tube side cavity is formed in the annular wall of the outer tube 1030, the outer tube side cavity being configured to receive the electrode arm. In this way, an effective accommodation and a better protection of the electrode arm can be achieved, reducing the possibility of failure of the electrode arm. In order to achieve an effective monitoring of the extension of the electrode arm or the contact state of the electrode arm with the target tissue, the electrode catheter can also comprise a sensor which is designed to detect the contact state of the respective electrode part with the target object. In this way, it can be determined which or which electrode arm needs to be finely adjusted, on the basis of which the corresponding electrode arm is found and the extension of the corresponding electrode arm is adjusted by means of the electrode arm adjusting part, so that a more effective ablation region and thus a better ablation effect are achieved. To further facilitate the operation of the electrode arm adjustment section, the electrode catheter 1000 further includes a prompting device configured to generate a prompting signal based on the fit state.
Furthermore, a second aspect of the present disclosure proposes an ablation apparatus comprising: a pulse signal generator configured to generate a pulse signal; and the electrode catheter according to the first aspect of the present disclosure, an electrode portion of the electrode catheter being electrically connected with an output terminal of the pulse signal generator.
In summary, the electrode arm adjusting portion provided according to the present disclosure can adjust the extending state of the corresponding electrode arm in a targeted manner, so that the extending amount of the adjusted electrode arm can be different from the extending amounts of other non-adjusted electrode arms, and further the electrode arm of the electrode catheter provided according to the present disclosure can be adjusted in a targeted manner based on the specific form of the target tissue, so as to be attached to the target tissue in different forms well, thereby achieving a better ablation effect.
While various exemplary embodiments of the disclosure have been described, it will be apparent to those skilled in the art that various changes and modifications can be made which will achieve one or more of the advantages of the disclosure without departing from the spirit and scope of the disclosure. Other components performing the same function may be substituted as appropriate by those skilled in the art. It should be understood that features explained herein with reference to a particular figure may be combined with features of other figures, even in those cases where this is not explicitly mentioned. Further, the methods of the present disclosure may be implemented in either all software implementations using appropriate processor instructions or hybrid implementations using a combination of hardware logic and software logic to achieve the same result. Such modifications to the solution according to the disclosure are intended to be covered by the appended claims.
Claims (13)
1. An electrode catheter, characterized in that the electrode catheter comprises:
a leading end support configured as a leading end free end of the electrode catheter;
a rear end control part, the rear end control part and the front end support part being respectively provided at both ends of the electrode catheter;
an inner tube extending at least between the leading end support and the trailing end control and configured to define a shape of the electrode catheter;
the outer pipe is coated outside the inner pipe;
an electrode arm disposed between the inner tube and the outer tube and comprising at least three electrode arms, wherein each of the at least three electrode arms comprises at least one electrode portion and distal ends of the at least three electrode arms are fixedly connected with the inner tube by the leading end support and extend between the leading end support and the trailing end control; and
an electrode arm adjusting part is arranged on the electrode arm,
and wherein at least a portion of each of the at least three electrode arms is adapted to switch between a first state, which assumes a linear shape, and a second state, which assumes an arc shape, under the control of the rear end control section, and wherein the electrode arm adjustment section is connected with at least one electrode arm to adjust the extended state of the at least one electrode arm.
2. The electrode catheter of claim 1, wherein the electrode arm further comprises:
an inner core;
a wire routed along an axial direction of the inner core;
an insulating sleeve covering the inner core and the wire,
wherein the electrode portion is arranged outside the insulating sleeve, and the lead is connected to the electrode portion at the electrode portion through the insulating sleeve.
3. The electrode catheter of claim 2, wherein the inner core is made of a memory material or a medical stainless steel material.
4. The electrode catheter according to claim 1, wherein the electrode arm adjusting part is configured to be fixedly connected with the corresponding electrode arm.
5. The electrode catheter according to claim 1, wherein the electrode arm adjustment part is configured to be movable between a first position and a second position to selectively connect with a first electrode arm of the at least three electrode arms at the first position or connect with a second electrode arm of the at least three electrode arms at the second position.
6. The electrode catheter according to claim 1, wherein the electrode arm adjusting part is configured to be mechanically connected with at least two electrode arms.
7. The electrode catheter according to claim 6, wherein the electrode arm adjusting part is configured to be mechanically connected with the at least two electrode arms via transmission members having different transmission ratios.
8. The electrode catheter according to claim 1, wherein the electrode arm adjusting part is configured as an electrode arm push-pull, the electrode arm push-pull comprising:
a card slot provided on a surface of the rear end control portion; and
a clip connected with the corresponding electrode arm and disposed in the card slot.
9. The electrode catheter of claim 1, wherein an outer tube side lumen is formed in the annular wall of the outer tube, the outer tube side lumen being configured to receive the electrode arm.
10. The electrode catheter of claim 1, wherein the rear end control portion comprises:
an inner tube push-pull configured to drive the inner tube back and forth along the longitudinal extent of the electrode catheter.
11. The electrode catheter of claim 1, further comprising:
a sensor configured to detect a bonding state of the respective electrode portions with the target object.
12. The electrode catheter of claim 11, further comprising a cue device configured to generate a cue signal based on the fit state.
13. An ablation device, characterized in that the ablation device comprises:
a pulse signal generator configured to generate a pulse signal; and
the electrode catheter according to any one of claims 1 to 12, an electrode portion of the electrode catheter being electrically connected with an output of the pulse signal generator.
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| CN202111162744.XA CN113729924B (en) | 2021-09-30 | 2021-09-30 | Electrode catheter and ablation device |
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| CN202111162744.XA CN113729924B (en) | 2021-09-30 | 2021-09-30 | Electrode catheter and ablation device |
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| CN113729924B (en) | 2023-10-20 |
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