Laser ablation catheter with shock wave balloon

Abstract

The invention provides a laser ablation catheter with a shock wave balloon, and the laser ablation catheter comprises a catheter, a guide wire cavity is formed in the catheter, the catheter is provided with a near-end section, a transition section and a far-end section which are sequentially connected with one another, and the diameter of the near-end section is smaller than that of the far-end section; the ablation optical fibers are arranged in the catheter; the plurality of ablation probes are arranged at the far-end section, the near end of each ablation probe is connected with the far end of each ablation optical fiber, and a connecting section, connected with the ablation optical fiber, of each ablation probe is in a flaring shape in the direction from the near-end section to the far-end section; the balloon is arranged on the outer side of the catheter and located at the near-end section, and the balloon is communicated with a catheter which is arranged in the catheter and used for charging and discharging conductive liquid into the balloon; the electrode pairs are arranged on the outer side wall of the catheter and located in the balloon, and wires electrically connected with the electrode pairs are arranged in the catheter. The laser ablation catheter with the shock wave balloon is good in passing ability in a blood vessel and high in safety.

Description

Technical Field

[0001] The present application belongs to the technical field of medical devices, and more specifically, relates to a laser ablation catheter with a shock wave balloon. Background Art

[0002] CTO (chronic total occlusion) refers to a lesion in which the forward blood flow of the occluded vascular segment is TIMI grade 0 and the occlusion time is greater than or equal to three months.

[0003] In the related art, the treatment method for this type of lesion is generally laser ablation or shock wave lithotripsy. That is, a laser ablation catheter is used, and an ablation probe is set at the distal end of the catheter to ablate the deposits in the artery, or a shock wave balloon is set on the catheter to release the lesions remaining on the side wall of the blood vessel, thereby effectively opening the narrowed section of the blood vessel.

[0004] However, there are some multi-mode catheters for laser ablation and shock wave balloons. In such laser ablation catheters, since the shock wave balloon is set on the outer wall of the catheter, the cross-sectional area of ​​the laser ablation catheter at the shock wave balloon is larger than the cross-sectional area at the ablation probe, that is, the laser ablation area is smaller than the cross-sectional area of ​​the laser ablation catheter at the shock wave balloon. As a result, after the ablation probe ablates the lesion directly in front of it, the ablation area is still not enough for the shock wave balloon to pass through, thereby affecting the passability of the laser ablation catheter in the blood vessel. In order to allow the shock wave balloon to pass, the laser ablation power needs to be increased, and a larger ablation power will cause damage to the blood vessel. Summary of the invention

[0005] The purpose of the embodiments of the present application is to provide a laser ablation catheter to solve the technical problem of poor passability of multi-modal laser ablation catheters in the prior art.

[0006] To achieve the above-mentioned purpose, the technical solution adopted in the present application is to provide a laser ablation catheter with a shock wave balloon, which comprises:

[0007] A catheter having a guidewire cavity formed therein, the catheter comprising a proximal section, a gradient section and a distal section which are sequentially connected to each other, and a diameter of the proximal section is smaller than a diameter of the distal section;

[0008] A plurality of ablation optical fibers are disposed in the catheter;

[0009] A plurality of ablation probes are arranged in the distal section, each of the ablation probes is connected to each of the ablation optical fibers, the connection section on the ablation probe connected to the ablation optical fiber is flared in the direction from the proximal section to the distal section, and the diameter of the proximal end of the ablation probe is smaller than the diameter of the distal end;

[0010] A balloon is arranged outside the catheter and located at the proximal section, the balloon is connected to a liquid catheter arranged in the catheter for filling and discharging a conductive liquid into the balloon, and when the balloon is in a contracted state, the cross-sectional area of ​​the laser ablation catheter with a shock wave balloon at the balloon is smaller than the cross-sectional area of ​​the distal section;

[0011] A plurality of electrode pairs are arranged on the outer wall of the catheter and located inside the balloon, and a wire electrically connected to the electrode pairs is arranged in the catheter.

[0012] Optionally, the outer side surface of the connecting section on the ablation probe is a conical surface.

[0013] Optionally, each ablation probe is connected to each ablation optical fiber by welding; or, each ablation probe is integrally formed with each ablation optical fiber by tapered wire drawing.

[0014] Optionally, the ablation probes are arranged in an array in a circumferential direction around the guidewire cavity; the ablation probes are welded or spaced apart on the same fixing ring.

[0015] Optionally, the electrode pair includes two electrode members that are opposite to each other and spaced apart, and a limiting member is provided on the outer side wall of the catheter, wherein the limiting member is used to limit the axial position between the two electrode members in the same electrode pair.

[0016] Optionally, the catheter includes an inner tube and an outer tube, and the ablation optical fiber, the guide wire and the catheter are all arranged between the inner tube and the outer tube.

[0017] Optionally, the limiting member is a plug-in bolt, each of the electrode members is connected to the plug-in bolt, and the plug-in bolt is fixedly inserted in the outer tube.

[0018] Optionally, an insulating member is provided between each electrode member and the outer wall of the conduit, and the plug is passed through the insulating member.

[0019] Optionally, an insulating member is sleeved on the outside of the catheter, and the two electrode members in the same electrode pair are arranged on the insulating member.

[0020] Optionally, the electrode member is in the shape of a ring sleeve; and a protrusion extending along the annular axial direction is provided on opposite sides of the two electrode members in the same electrode pair.

[0021] The laser ablation catheter with a shock wave balloon provided in the present application has at least the following beneficial effects:

[0022] First, by connecting a gradient section between the distal section and the proximal section on the catheter, and the diameter of the distal section is larger than the diameter of the proximal section, the balloon is arranged at the proximal section, and the ablation probe is arranged at the distal section. In this way, when the balloon is in a contracted state, the cross-sectional area of ​​the laser ablation catheter with a shock wave balloon at the balloon is smaller than the erosion area of ​​the ablation probe, thereby improving the passability of the laser ablation probe in complex blood vessels.

[0023] Furthermore, the connection section on the ablation probe connected to the ablation optical fiber is flared, so that the flared connection section can disperse the laser beam, increase the laser ablation area while controlling the laser intensity within the unit ablation area within a safe range, thereby improving the safety of laser ablation. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0025] Figure 1 A schematic diagram of the outer tube of a laser ablation catheter equipped with a shock wave balloon in some embodiments of the present application;

[0026] Figure 2 Schematic diagram showing the internal structure of a laser ablation catheter with a shock wave balloon in some other embodiments of the present application;

[0027] Figure 3 Schematic diagram of an ablation optical fiber and an ablation probe in some embodiments of the present application;

[0028] Figure 4 A schematic diagram of a local structure of a laser ablation catheter in some embodiments of the present application;

[0029] Figure 5 A cross-sectional view of a laser ablation catheter with a shock wave balloon at an electrode member in some embodiments of the present application;

[0030] Figure 6 This is a schematic diagram of an electrode assembly mounted on the outside of a catheter in some embodiments of the present application;

[0031] Figure 7 This is a schematic diagram of the assembly of the ablation probe in some embodiments of the present application;

[0032] Figure 8 This is a schematic diagram of the connection between a laser ablation catheter with a shock wave balloon, a shock wave pulse generator and a laser emitter in some embodiments of the present application.

[0033] Among them, the reference numerals in the figure are:

[0034] 100. Catheter;

[0035] 101, inner tube; 1011, guide wire cavity; 102, outer tube;

[0036] 110, distal segment; 120, transition segment; 130, proximal segment;

[0037] 200, ablation optical fiber;

[0038] 300, ablation probe; 310, connecting section;

[0039] 400, balloon;

[0040] 500, catheter;

[0041] 600, electrode pair;

[0042] 610, electrode member; 611, protrusion; 620, plug;

[0043] 700, wire;

[0044] 800, insulation parts;

[0045] 900, fixing ring;

[0046] A. Laser transmitter;

[0047] B. Shock wave pulse generator. DETAILED DESCRIPTION

[0048] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0049] It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0050] It should be noted that when an element is referred to as being “fixed to” or “disposed on” another element, it may be directly on the other element or indirectly on the other element.

[0051] When an element is referred to as being “connected to” another element, it can be directly connected to the other element or indirectly connected to the other element.

[0052] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0053] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features.

[0054] In the description of the present application, “plurality” means two or more than two, unless otherwise clearly and specifically defined.

[0055] Please also read Figures 1 to 8 Now, the laser ablation catheter with a shock wave balloon provided in an embodiment of the present application is described.

[0056] refer to Figures 1 to 3 The laser ablation catheter with a shock wave balloon described in the present application includes a catheter 100, an ablation optical fiber 200, an ablation probe 300, a balloon 400 and an electrode pair 600.

[0057] Specifically, a guidewire cavity 1011 is formed in the catheter 100 . The catheter 100 includes a proximal section 130 , a gradient section 120 , and a distal section 110 which are sequentially connected to each other. The diameter of the proximal section 130 is smaller than that of the distal section 110 .

[0058] It is understandable that the guidewire lumen 1011 is in communication with the end surface of the distal segment 110 of the catheter 100. By providing the guidewire lumen 1011, the imaging device can be guided to the distal segment 110 in the catheter 100 to image the lesion in the blood vessel.

[0059] It is understandable that the catheter 500 and the wire 700 are both disposed inside the catheter 100. In this way, the wire 700 and the catheter 500 can be prevented from falling off and separating from the catheter 100 during the movement of the laser ablation catheter in the blood vessel, and the corrosion of the wire 700 by the electrolyte can also be avoided.

[0060] A plurality of ablation optical fibers 200 are disposed in the catheter 100. Specifically, they can be disposed in the catheter 100, or fixed to the outer wall of the catheter 100 by gluing, or fixed to the catheter 100 by a cluster ring, but the present invention is not limited thereto. Figure 8The proximal end of the ablation optical fiber 200 is used to connect to the laser transmitter A, and the distal end thereof is used to connect to the ablation probe 300. The laser transmitter A transmits the modulated laser to the ablation probe 300 through the ablation optical fiber 200, and the modulated laser is emitted from the ablation probe 300 through the exit surface.

[0061] refer to Figure 2 and Figure 3 A plurality of ablation probes 300 are also provided at the distal end section 110 of the catheter 100, and the proximal end of each ablation probe 300 is respectively connected to the distal end of each ablation optical fiber 200. It should be understood that the ablation probe 300 and the ablation optical fiber 200 are made of the same material.

[0062] For further reference, Figure 2 and Figure 3 , the connecting section 310 on the ablation probe 300 connected to the ablation optical fiber 200 is flared in the direction from the proximal section 130 to the distal section 110, that is, the diameter of the distal end of the connecting section 310 on the ablation probe 300 is larger than the diameter of the proximal end. Specifically, the cross-sectional size of the connecting section 310 on the ablation probe 300 at each location in the axial direction from the proximal end to the distal end can be linearly increased or nonlinearly increased, and the specific embodiment is not limited thereto.

[0063] The flared connecting section 310 on the ablation probe 300 is configured as follows:

[0064] On the one hand, it can disperse the laser beam, that is, the laser ablation area acting on the vascular lesion is larger than the cross-sectional area of ​​the distal end section 110 of the catheter 100, and the diameter of each ablation probe 300 can be reduced under the premise of meeting the laser ablation area, that is, the cross-sectional area of ​​the distal end section 110 of the catheter 100 can be reduced, thereby improving the passability of the laser ablation catheter in the blood vessel;

[0065] On the other hand, since the ablation probe 300 can disperse the laser beam, the modulated laser with a relatively high power in the single ablation optical fiber 200 can be dispersed and irradiated on a relatively large ablation area, that is, the light intensity per unit ablation area can be controlled within a safe range, thereby preventing the excessive ablation power from causing burns to healthy tissues in the blood vessels and other hidden dangers, thereby improving the safety of laser ablation.

[0066] On the other hand, combining the above two advantages, in specific applications, the laser power transmitted by a single ablation optical fiber 200 can be controlled within a larger range, and then the laser beam can be dispersed through the ablation probe 300 to reduce the laser light intensity per unit area. Thus, when the total ablation power required in the ablation area is constant, the amount of ablation optical fiber 200 used can be reduced, thereby ultimately achieving the purpose of reducing the overall diameter of the laser ablation catheter, and also improving the passability of the laser ablation catheter in the blood vessel.

[0067] refer to Figure 2 and Figure 3 The balloon 400 is disposed on the outer side wall of the catheter 100 and is located on the proximal section 130 of the catheter 100 near the gradient section 120. It can be understood that the balloon 400 is connected to the distal end of the catheter tube 500, and the proximal end of the catheter tube 500 is connected to the conductive liquid pressure pump, which is used to charge and discharge the conductive liquid in the balloon 400 to expand or contract the balloon 400.

[0068] When the balloon 400 is inflated, the outer side wall of the balloon 400 can contact the side wall of the blood vessel. When the balloon 400 is deflated, since the balloon 400 is disposed on the proximal section 130 of the catheter 100, and the diameter of the proximal section 130 on the catheter 100 is smaller than the diameter of the distal section 110, when the balloon 400 is completely deflated, the cross-sectional area of ​​the laser ablation catheter where the balloon 400 is disposed is smaller than the cross-sectional area of ​​the distal section 110, that is, when the laser ablation catheter passes through the blood vessel, if the distal section 110 of the catheter 100 can pass through, the balloon 400 on the catheter 100 can also pass through smoothly.

[0069] Several pairs of electrode pairs 600 are disposed on the outer wall of the catheter 100 and inside the balloon 400. Each electrode pair 600 includes a positive electrode and a negative electrode. Each positive electrode and negative electrode pair has a corresponding wire 700 electrically connected thereto. Figure 8 , wire 700 is connected to shock wave pulse generator B.

[0070] After the balloon 400 is filled with conductive liquid until the side wall of the balloon 400 contacts the side wall of the blood vessel, the shock wave pulse generator B emits a pulse voltage, arc discharge is generated between the positive and negative electrodes of the same electrode pair 600, and pulse acoustic pressure waves are generated between the conductive liquids inside the balloon 400. Since the side wall of the balloon 400 contacts the side wall of the blood vessel, the pulse acoustic pressure waves can not only loosen the calcified plaques attached to the inner wall of the blood vessel, but also loosen the calcified plaques between the intima and the media of the blood vessel that cannot be ablated by the modulated laser, and the integrity of the intima of the blood vessel is not affected during the loosening process.

[0071] Furthermore, in some embodiments of the present application, the distal section 110 of the catheter 100 is provided with a developing ring, so that the traceability of the catheter 100 can be improved to improve the success rate of the treatment.

[0072] For further reference, Figure 2 and Figure 3 In some embodiments of the present application, the outer side surface of the connecting section on the ablation probe 300 is a conical surface, that is, the cross-sectional size of the ablation probe 300 at various locations in the axial direction from the proximal end to the distal end increases linearly.

[0073] The connection section 310 on the ablation probe 300 is configured in this way so that the reflection of the laser in the connection section 310 is more uniform, thereby increasing the consistency of the laser light intensity in each area of ​​the ablation region and improving the ablation effect.

[0074] Furthermore, based on the aforementioned embodiments, the ablation probe 300 and the ablation optical fiber 200 may be connected in the following manners.

[0075] In some embodiments, the ablation probe 300 is connected to the ablation optical fiber 200 by welding. That is, the ablation probe 300 and the ablation optical fiber 200 are melted and connected to each other at the connection point by discharge, so that the two form a tapered gradient at the connection point.

[0076] In other embodiments, the ablation probe 300 and the ablation optical fiber 200 are integrally formed. That is, the two are tapered through the same thick optical fiber, so that the same optical fiber is tapered to form sections with different diameters, wherein the section with a larger diameter is the ablation probe 300, and the section with a smaller diameter is the ablation optical fiber 200, and a gradual taper is formed between different sections.

[0077] This implementation can make the surface of the connection between the connecting section 310 on the ablation probe 300 and the ablation optical fiber 200 smooth, and the light energy loss is small during the transmission of the laser from the ablation optical fiber 200 to the ablation probe 300 through the connecting section 310.

[0078] It is understandable that in some embodiments of the present application, the ablation probes 300 are arranged in an array in a circumferential direction around the guidewire cavity 1011 , that is, the outlet of the guidewire cavity 1011 in the catheter 100 is located between the ablation probes 300 .

[0079] Specifically, there are many ways to dispose the ablation probe 300 in the distal section 110 .

[0080] For example, in some embodiments, the ablation probes 300 are connected by welding. In this way, there is no gap between the ablation probes 300, which can reduce the diameter of the distal end section 110 of the catheter 100, thereby further improving the passability of the laser ablation catheter in the blood vessel.

[0081] For example, refer to Figure 7 In other embodiments, a fixing ring 900 is provided at the distal end section 110 of the catheter 100, and the fixing ring 900 is provided with a through hole for avoiding the guidewire cavity 1011 in the catheter 100, and fixing holes are arranged in an array around the through hole in a circumferential direction, and each ablation probe 300 is inserted into each fixing hole to achieve fixation. In this way, each ablation probe 300 is fixed conveniently and quickly, the assembly accuracy is easy to control, and the assembly difficulty is relatively low.

[0082] Understandably, reference Figure 4 and Figure 6 In some embodiments of the present application, specifically, the electrode pair 600 includes two electrode members 610 that are opposite and spaced apart, the wire 700 connected to the positive pole of the shock wave pulse generator B is connected to one of the electrode members 610, and the wire 700 connected to the negative pole of the shock wave pulse generator B is connected to the other electrode member 610, and the electrode members 610 are the aforementioned positive electrode and negative electrode.

[0083] In specific applications, the electrode member 610 may be in a block shape, or in a ring-shaped sleeve shape or sheet shape. It is understandable that in the arrangement mode where the electrode member 610 is in a block shape, a plurality of electrode pairs 600 may be arranged at intervals in the same circumferential direction of the outer wall of the catheter 100 .

[0084] In specific applications, the electrode member 610 can be made of metal materials such as stainless steel, platinum-iridium, tungsten, and nickel.

[0085] For further reference, Figure 4 and Figure 6 The two electrode members 610 in the same electrode pair 600 are coaxial and arranged opposite to each other, so that a discharge gap is formed between the two electrode members 610. For example, the gap between the two electrode members 610 is 0.05-0.1 mm.

[0086] For further reference, Figure 4 and Figure 5 A limiting member is provided on the outer wall of the catheter 100, and the limiting member is used to limit the axial position between the two electrode members 610 in the same electrode pair 600. It can be understood that the limiting member is fixedly provided on the catheter 100, for example, it can be a protrusion integrally formed with the catheter 100 on the outer wall of the catheter 100, or it can be a plug 620 inserted on the catheter 100 and connected to the electrode member 610. Of course, the limiting member can also be provided in other forms.

[0087] By providing the stopper, the stability of the axial position of the electrode member 610 on the catheter 100 can be improved. When arc discharge occurs between two electrode members 610 in the same electrode pair 600, the two electrode members 610 can maintain a stable axial position to avoid changes in the discharge gap caused by displacement, so that the pulse acoustic pressure wave generated in the conductive liquid inside the balloon 400 can achieve the desired effect, so that the shock wave treatment effect of the balloon 400 is stable.

[0088] Understandably, reference Figure 4 and Figure 5 Based on the aforementioned embodiments, the catheter 100 includes an inner tube 101 and an outer tube 102 .

[0089] Correspondingly, the aforementioned ablation optical fiber 200 , ablation probe 300 , catheter 500 and guide wire 700 are all arranged in the gap between the inner tube 101 and the outer tube 102 , and the aforementioned guidewire cavity 1011 is the inner cavity of the inner tube 101 .

[0090] It should be understood that the aforementioned ablation optical fiber 200, catheter 500 and wire 700 do not need to be fixedly arranged in the gap between the inner tube 101 and the outer tube 102, and the ablation probe 300 can be fixedly arranged on the distal section 110 of the catheter 100 according to the connection method in the aforementioned embodiment.

[0091] The catheter 100 is configured in such a way that the guide wire 700, the catheter 500, the ablation optical fiber 200 and the ablation probe 300 do not occupy the space of the guidewire cavity 1011 in the catheter 100, so that the cavity wall of the guidewire cavity 1011 is regular and smooth, thereby allowing imaging equipment and the like to be smoothly placed along the guidewire cavity 1011 to image the lesion.

[0092] Understandably, reference Figure 5 In the configuration in which the catheter 100 is provided with an inner tube 101 and an outer tube 102 , the aforementioned limiting member is a plug 620 .

[0093] Specifically, an insertion hole (not shown) is provided on the outer tube 102, one end of the plug 620 is in contact with or fixedly connected to the electrode member 610, and the other end is inserted into the insertion hole. In this way, the setting of the stopper is convenient and quick, and the position of the electrode member 610 outside the catheter 100 is convenient and accurate.

[0094] Furthermore, it can be understood that, at the same axial position on the outer side wall of the catheter 100 , the number of the plugs 620 is consistent with the number of the electrode members 610 and the two are arranged in a one-to-one correspondence.

[0095] In a specific application, according to different configurations of the electrode member 610 , the material of the plug 620 and the connection method between the plug 620 and the electrode member 610 may also be different.

[0096] For example, when the electrode member 610 is in the shape of an annular sheet or an annular sleeve, the plug 620 can be made of the same metal material as the electrode member 610, or can be made of a non-metallic material. Specifically, when the plug 620 is made of a non-metallic material, one end of the plug 620 abuts against the electrode member 610; and when the plug 620 is made of a metal material, one end of the plug 620 can abut against the electrode member 610, or can be welded, or the plug 620 can be integrally formed with the electrode member 610, and one end of the plug 620 inserted in the insertion hole is connected to the wire 700, so as to realize power supply to the electrode member 610.

[0097] For another example, when the electrode member 610 is in a block shape, the plug 620 is preferably made of metal and is welded to the electrode member 610. At the same time, insertion holes with the same number as the electrode member 610 are opened on the outer wall of the catheter 100. Similarly, one end of the plug 620 inserted in the insertion hole is connected to the wire 700.

[0098] For further reference, Figure 5 and Figure 6 In some embodiments of the present application, an insulating member 800 is provided between the electrode member 610 and the outer wall of the catheter 100. The insulating member 800 may be made of insulating materials such as polytetrafluoroethylene, polyimide, ceramic, and polyamide.

[0099] In specific applications, different shapes of electrode members 610 correspond to different shapes of insulating members 800. For example, when the electrode member 610 is block-shaped, the insulating member 800 is sheet-shaped; when the electrode member 610 is annular or sleeve-shaped, the insulating member 800 is sleeve-shaped.

[0100] The insulating member 800 is used to prevent the two electrode members 610 in the same electrode pair 600 from breaking through the outer wall of the conduit 100 due to excessive instantaneous voltage when arc discharge occurs, thereby causing damage to the conduit 100. Correspondingly, a through hole for the plug 620 to pass through is provided on the insulating member 800, so that the plug 620 can also play a role in fixing the insulating member 800.

[0101] In other embodiments of the present application, an insulating member 800 is sleeved on the outside of the catheter 100. The insulating member 800 is in the shape of a ring. Similarly, the insulating member 800 can be made of insulating materials such as polytetrafluoroethylene, polyimide, ceramic, polyamide, etc. The length of the insulating member 800 is greater than or equal to the length of the electrode pair 600, and the two electrode members 610 in the same electrode pair 600 are both arranged on the insulating member 800. In this way, the insulating member 800 not only provides insulation protection for the outer wall of the catheter 100, but also plays a positioning function for the assembly of the electrode pair 600.

[0102] For further reference, Figure 6 On the basis of the above-mentioned embodiments, the electrode member 610 is annular; the opposite sides of the two electrode members 610 in the same electrode pair 600 are provided with protrusions 611 extending along the annular axial direction. That is, in the same electrode pair 600, the gap between the protrusions 611 at the relative positions between the two electrode members 610 is smaller than the gap between other parts of the two electrode members 610.

[0103] The two electrode members 610 in the same electrode pair 600 are arranged in this way, so that when arc discharge is generated between the two electrode members 610, the intensity of the arc discharge can be increased, and the discharge position on the electrode member 610 can be limited to between two opposite protrusions 611, so that the generation position of the shock wave in the balloon 400 can be kept stable, thereby improving the accuracy and efficiency of clinical treatment.

[0104] It is understandable that there may be only one or more protrusions 611 on each electrode member 610. For example, when there are multiple protrusions 611 on the electrode member 610, the protrusions 611 are arranged in an array along the circumferential direction of the end surface of the electrode member 610.

[0105] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A laser ablation catheter with a shock wave balloon, characterized in that: include: A catheter, wherein a guidewire cavity is formed in the catheter, the catheter comprises a proximal section, a gradient section and a distal section which are sequentially connected to each other, and the diameter of the proximal section is smaller than the diameter of the distal section; A plurality of ablation optical fibers are disposed in the catheter; A plurality of ablation probes are arranged in the distal section, each of the ablation probes is connected to each of the ablation optical fibers, the connection section on the ablation probe connected to the ablation optical fiber is flared in the direction from the proximal section to the distal section, and the diameter of the proximal end of the ablation probe is smaller than the diameter of the distal end; A balloon is arranged outside the catheter and located at the proximal section, the balloon is connected to a liquid catheter arranged in the catheter for filling and discharging a conductive liquid into the balloon, and when the balloon is in a contracted state, the cross-sectional area of ​​the laser ablation catheter with a shock wave balloon at the balloon is smaller than the cross-sectional area of ​​the distal section; A plurality of electrode pairs are arranged on the outer wall of the catheter and located inside the balloon, and a wire electrically connected to the electrode pairs is arranged in the catheter.

2. The laser ablation catheter with a shock wave balloon according to claim 1, characterized in that: The outer side surface of the connecting section on the ablation probe is a conical surface.

3. The laser ablation catheter with a shock wave balloon according to claim 1 or 2, characterized in that: Each of the ablation probes is connected to each of the ablation optical fibers by welding; or, each of the ablation probes is integrally formed with each of the ablation optical fibers by taper drawing.

4. The laser ablation catheter with a shock wave balloon according to claim 1, characterized in that: The ablation probes are arranged in an array in the circumferential direction around the guide wire cavity; the ablation probes are connected by welding or arranged at intervals on the same fixing ring.

5. The laser ablation catheter with a shock wave balloon according to claim 1, characterized in that: The electrode pair includes two electrode members that are opposite to each other and spaced apart. A limiting member is provided on the outer side wall of the catheter, and the limiting member is used to limit the axial position between the two electrode members in the same electrode pair.

6. The laser ablation catheter with a shock wave balloon according to claim 5, characterized in that: The catheter comprises an inner tube and an outer tube, and the ablation optical fiber, the guide wire and the catheter are all arranged between the inner tube and the outer tube.

7. The laser ablation catheter with a shock wave balloon according to claim 6, characterized in that: The limiting member is a plug-in bolt, each of the electrode members is connected to the plug-in bolt, and the plug-in bolt is fixedly inserted in the outer tube.

8. The laser ablation catheter with a shock wave balloon according to claim 7, characterized in that: An insulating member is provided between each electrode member and the outer side wall of the conduit, and the plug is passed through the insulating member.

9. The laser ablation catheter with a shock wave balloon according to any one of claims 5 to 7, characterized in that: An insulating member is sleeved on the outer side of the catheter, and the two electrode members in the same electrode pair are arranged on the insulating member.

10. The laser ablation catheter with a shock wave balloon according to claim 9, characterized in that: The electrode piece is in the shape of a ring sleeve; a protrusion extending along the annular axial direction is arranged on the opposite side of the two electrode pieces in the same electrode pair.

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