Shock wave catheter easy to pass through target blood vessel

Abstract

The utility model discloses a shock wave catheter easy to pass through in a target blood vessel, which comprises a catheter seat, an outer tube, an inner tube, a balloon and at least one pair of spiral leads which are arranged at intervals, and the spiral leads are spirally wound on the periphery of a tail section. A plurality of pairs of exposed areas which are opposite in the axial direction of the inner pipe are formed on at least one pair of spiral wires in the length direction of the spiral wires, and a pair of discharge electrodes are formed in one pair of exposed areas. When the shock wave catheter passes through a target blood vessel, the pipe diameter of the shock wave catheter can be reduced based on the mode that the spiral wire forms the discharge electrode, meanwhile, the flexibility of the shock wave catheter at the tail section can be improved, and therefore the shock wave catheter can pass through the target blood vessel more easily.

Description

Technical Field

[0001] The utility model relates to the technical field of medical devices, in particular to a shock wave catheter which is easy to pass through a target blood vessel. Background Art

[0002] Interventional medicine is a discipline that relies on the guidance of medical imaging equipment, uses puncture and catheter technology to diagnose and treat diseases, and is mainly based on treatment. It has the characteristics of accurate positioning, less trauma, fewer complications, high efficacy, rapid effect, and strong repeatability. Interventional treatment has become the third largest clinical treatment method alongside internal medicine and surgical treatment.

[0003] The interventional surgeries currently used in clinical practice include: percutaneous transluminal coronary angioplasty (PTCA) and stenting, mitral valve surgery, radiofrequency ablation, interventional treatment of congenital heart disease, intracoronary thrombolysis, etc. Among them, percutaneous transluminal coronary angioplasty (PTCA) is the most commonly used method for treating coronary heart disease. When the catheter is used to expand the calcified lesions in the blood vessel wall, the balloon will gradually release the pressure until the calcified lesions rupture.

[0004] Studies have shown that by placing one or more pairs of discharge electrodes in an angioplasty balloon to form a shock wave generator device, high-voltage pulses are applied to the shock wave generator device to generate shock waves in the balloon. The shock waves can selectively destroy calcified lesions in the blood vessel wall while effectively avoiding damage to the blood vessel wall.

[0005] Based on this, catheters capable of generating shock waves for treating calcified lesions have emerged on the market, namely shock wave catheters, in which electrodes are generally single or multiple annular electrodes. Since the annular electrodes increase the overall outer diameter of the catheter and reduce the axial flexibility of the catheter (the catheter is not easy to bend), the structural characteristics of the annular electrodes will reduce the passing performance of the shock wave catheter in the target blood vessel, reducing the scope of application of the shock wave catheter. Utility Model Content

[0006] The utility model provides a shock wave catheter which is easy to pass through a target blood vessel, so as to solve the technical problem that the existing shock wave catheter has poor passing performance in the target blood vessel.

[0007] According to an embodiment of the utility model, the shock wave catheter that is easy to pass through the target blood vessel includes:

[0008] A catheter seat, wherein the catheter seat is formed with a guide wire channel and an infusion flow channel;

[0009] an outer tube, one end of which is connected to the catheter seat;

[0010] An inner tube, one end of which is connected to the catheter seat and sleeved in the outer tube, the tail section of the inner tube extends out of the outer tube, a tube channel is formed between the inner tube and the outer tube, and the tube channel is connected to the wire channel, and the tube channel is connected to the infusion channel;

[0011] A balloon, which is sealed and sleeved on the outer periphery of the tail section and is sealed and connected to the tube channel;

[0012] and at least one pair of spaced-apart spiral conductors, the spiral conductors being spirally wound around the outer periphery of the tail section, and at least one pair of the spiral conductors being formed with a plurality of pairs of exposed areas opposite to each other in the axial direction of the inner tube along the length direction of the spiral conductors, a pair of the exposed areas forming a pair of discharge electrodes.

[0013] In some embodiments of the shock wave guide tube, a lead-out wire is further included, wherein the lead-out wire is connected to the spiral wire and passes through the tube channel and the wire channel in sequence.

[0014] In some embodiments of the shock wave guide tube, the spiral wire is formed by winding a whole wire in a spiral manner on the tail section.

[0015] In some embodiments of the shock wave guide tube, the spiral conductor includes an inner core and an insulating layer sleeved around the inner core, and the insulating layer is made of PI or PTFE.

[0016] In some embodiments of the shock wave guide, the inner core is a flattened oval with a circular cross-section.

[0017] In some embodiments of the shock wave guide, the inner core is made of tungsten or nickel titanium or stainless steel.

[0018] In some embodiments of the shock waveguide tube, the pitch of the spiral wire is unchanged, the spacing between a pair of the spiral wires is 0.1 mm, the pitch is 3 mm, the diameter of the spiral wire is 0.1 mm-0.2 mm, and an exposed area with a length of 0.2 mm is formed every 3 mm in the length direction of the spiral wire, thereby evenly forming three pairs of opposing discharge electrodes in the length direction of the entire spiral wire.

[0019] In some embodiments of the shock wave catheter, the pitch of the spiral wire changes gradually, and the pitch gradually increases in the direction from the catheter seat to the tail section; and the distance between the exposed areas gradually increases in the direction from the catheter seat to the tail section.

[0020] In some embodiments of the shock wave guide tube, the ends of the outer tube and the inner tube connected to the guide tube seat are flush.

[0021] In some embodiments of the shock wave catheter, the catheter seat includes a catheter seat body and a lead-out portion obliquely connected to the catheter seat body, the lead-out portion forms the wire channel, and the catheter seat body forms the infusion channel.

[0022] Implementing the embodiments of the present utility model will have the following beneficial effects:

[0023] According to the shock wave catheter in the above embodiment, which is easy to pass through the target blood vessel, it includes a catheter seat, an outer tube, an inner tube, a balloon and at least one pair of spiral wires arranged separately. When the shock wave catheter is working, the spiral wire is connected to a high-voltage pulse generator. The high-voltage pulse generator applies a high-voltage pulse current to the spiral wire. At this time, the discharge electrode formed by the exposed area will discharge, thereby forming a shock wave in the balloon. The shock wave will be transmitted to the calcified lesion with the help of the liquid medium filled in the balloon through the infusion channel and the tube channel, so as to hit the calcified lesion and loosen the calcified lesion. Thereafter, the balloon is expanded by pressurizing the liquid medium inside the balloon, thereby expanding the blood vessel. The shock wave generated by the shock wave catheter can selectively destroy the calcified plaque in the blood vessel wall, while effectively avoiding damage to the blood vessel wall.

[0024] When the shock wave catheter passes through the target blood vessel, the discharge electrode is formed based on the spiral wire, which can reduce the diameter of the shock wave catheter and improve the flexibility of the shock wave catheter at the tail section, so that the shock wave catheter can pass through the target blood vessel more easily. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, 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 utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0026] in:

[0027] Figure 1 A schematic diagram of the structure of a shock wave guide tube in one embodiment is shown;

[0028] Figure 2 A schematic diagram of the structure of a spiral wire in one embodiment is shown;

[0029] Figure 3 A schematic diagram of the structure of a spiral wire in another embodiment is shown;

[0030] Description of main component symbols:

[0031] 100-catheter seat; 101-wire channel; 102-infusion channel; 103-tube channel; 110-catheter seat body; 120-lead-out portion;

[0032] 200-outer tube;

[0033] 300-inner tube; 310-tail section;

[0034] 400-Balloon;

[0035] 500- spiral wire; 510- discharge electrode

[0036] 600-Lead wire. DETAILED DESCRIPTION

[0037] In order to facilitate the understanding of the present invention, the present invention will be described more comprehensively with reference to the relevant drawings. The drawings provide preferred embodiments of the present invention. However, the present invention can be implemented in many other different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive.

[0038] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0039] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the technical field of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0040] The embodiment of the utility model provides a shock wave catheter (hereinafter referred to as "shock wave catheter") that is easy to pass through a target blood vessel. The shock wave catheter has a novel electrode structure, which makes it easier for the shock wave catheter to pass through the target blood vessel.

[0041] In the embodiments of the present invention, please refer to Figure 1 The shock wave catheter includes a catheter seat 100, an outer tube 200, an inner tube 300, a balloon 400 and at least one pair of spaced-apart spiral guide wires 500.

[0042] The catheter seat 100 plays a role of transition connection. On the one hand, it is used to fix the outer tube 200 and the inner tube 300, and on the other hand, it is used to form a connection with certain structural parts of the equipment or devices outside the shock wave catheter. These equipment or devices can be high-voltage pulse generators, syringes, etc., wherein the high-voltage pulse generator is used to form a high-voltage pulse current, and the syringe is used to inject a liquid medium into the balloon. The liquid medium can be physiological saline or a contrast agent, etc. A wire channel 101 and an infusion channel 102 are formed on the catheter seat 100.

[0043] The outer tube 200 and the inner tube 300 are generally coaxially arranged, one end of the outer tube 200 and the inner tube 300 are commonly connected to the catheter seat 100, the inner tube 300 is located inside the outer tube 200, the tail section 310 of the inner tube 300 extends out of the outer tube 200, and a tube channel 103 is formed between the inner tube 300 and the outer tube 200, which passes through from front to back. The tube channel 103 is connected to the guide wire channel 101, and the tube channel 103 is connected to the infusion channel 102.

[0044] Thus, the tube channel 103 and the wire channel 101 constitute a wire lead-out channel, the spiral wire 500 can be led out from the lead-out channel and connected to the high-voltage pulse generator, and the syringe can inject the liquid medium into the balloon through the infusion channel 102 and the tube channel 103.

[0045] When assembling the balloon 400 , it is necessary to ensure that it is sealingly sleeved on the outer periphery of the tail section 310 and is sealingly connected to the tube channel 103 .

[0046] There are two ways to assemble the balloon 400. One is to connect one end of the balloon 400 to a certain part on the tail section 310, and connect the other end of the balloon 400 to a certain part of the outer tube 200. At this time, the balloon 400 naturally covers the tube channel 103. The other is to connect one end of the balloon 400 to a certain part on the tail section 310, and connect the other end of the balloon 400 to the end of the outer tube 200. At this time, the internal space of the balloon 400 just docks with the tube channel 103.

[0047] Based on this, in order to ensure connection reliability, the balloon 400 can be assembled to the corresponding position by hot melt welding or laser welding.

[0048] At the same time, it needs to be ensured that the connection between the inner tube 300, the outer tube 200 and the catheter seat 100 is also required to be sufficiently tight. For this purpose, the outer tube 200, the inner tube 300 and the catheter seat 100 can be fixed by bonding or overmolding.

[0049] The balloon 400 needs to withstand a relatively large pressure, so the balloon 400 is generally made of a material with high plasticity, such as rubber, soft polyvinyl chloride, etc.

[0050] In addition, the length and other dimensions of the balloon 400 can be adaptively designed according to different conditions of the calcified lesions. When the calcified lesions are longer, the balloon 400 can be designed to be longer accordingly.

[0051] The spiral conductor 500 is spirally wound around the outer circumference of the tail section 310 , and at least one pair of spiral conductors 500 is formed with multiple pairs of exposed areas opposite to each other in the axial direction of the inner tube 300 along the length direction of the spiral conductor 500 , and a pair of exposed areas forms a pair of discharge electrodes 510 .

[0052] Specifically, in order to ensure tight connection between the spiral wire 500 and the tail section 310 , the spiral wire 500 and the tail section 310 may be fixed by bonding, high-frequency welding, laser welding, or the like.

[0053] In the embodiment of the utility model, when the shock wave catheter is working, the spiral conductor 500 is connected to a high-voltage pulse generator, and the high-voltage pulse generator applies a high-voltage pulse current to the spiral conductor 500. At this time, the discharge electrode 510 formed by the exposed area will discharge, thereby forming a shock wave in the balloon 400. The shock wave will be transmitted to the calcified lesion with the help of the liquid medium filled in the balloon 400 through the infusion channel 102 and the tube channel 103, so as to hit the calcified lesion and loosen the calcified lesion. Thereafter, the balloon 400 is expanded by pressurizing the liquid medium inside the balloon 400, thereby expanding the blood vessel. The shock wave generated by the shock wave catheter can selectively destroy the calcified plaque in the blood vessel wall, while effectively avoiding damage to the blood vessel wall.

[0054] When the shock wave catheter passes through the target blood vessel, the discharge electrode 510 is formed based on the spiral wire 500, which can reduce the diameter of the shock wave catheter and improve the flexibility of the shock wave catheter at the tail section 310, so that the shock wave catheter can pass through the target blood vessel more easily.

[0055] In one embodiment, please refer to Figure 1 The shock wave guide tube further includes a lead wire 600 , which is connected to the spiral wire 500 and passes through the tube channel 103 and the wire channel 101 in sequence.

[0056] In this embodiment, the wire connected to the high voltage pulse generator is divided into two parts, namely the spiral wire 500 and the lead wire 600, which facilitates the winding of the spiral wire 500. At the same time, the two-section wire structure also facilitates the overall assembly of the wire in the shock wave guide tube.

[0057] In order to achieve a secure connection between the spiral wire 500 and the lead wire 600, they can be connected as one by resistance welding, high frequency welding, laser welding or the like.

[0058] Of course, in another embodiment, the spiral wire 500 may also be formed by winding a whole wire in a spiral manner on the tail section 310 .

[0059] In one embodiment, please refer to Figure 2 The spiral conductor 500 includes an inner core and an insulating layer sleeved on the outer periphery of the inner core, and the insulating layer is made of PI or PTFE.

[0060] To form the aforementioned exposed area, the insulating layer on the spiral conductor may be removed at intervals by chemical etching, laser stripping, grinding, etc. to form the discharge electrode 510 .

[0061] Further, the inner core is generally configured to have a relatively regular cross-sectional shape, for example, its cross section may be circular, flat oval, etc. Of course, in some cases, the cross-sectional shape of the inner core may be designed to have other shapes.

[0062] In some embodiments, the inner core is made of a material with a relatively high melting point, preferably a metal material, such as tungsten, nickel titanium, or stainless steel.

[0063] The specific design of the spiral wire 500 is not restricted in this article. For example, the overall length of the spiral wire 500 can be designed according to the size of the balloon, and the diameter of the spiral wire 500, the pitch of the spiral wire 500, the spacing between a pair of spiral wires 500, and the length of the exposed area can also be designed according to the actual discharge requirements. It should be pointed out that, in general, under the premise of meeting the use requirements, by designing the spacing between the exposed areas to be smaller, it is more conducive to forming multi-point or even continuous spiral discharges in the length direction of the spiral wire 500, and then forming a uniform and stable shock wave in the effective area of ​​the target blood vessel, and the loosening effect on vascular calcification is more uniform.

[0064] In addition, the pitch of the spiral wire 500 is not fixed, and the pitch can be kept constant or gradually varied.

[0065] Taking the former as an example, the spiral conductor 500 can be designed as follows: the spacing between a pair of spiral conductors 500 is 0.1mm, the pitch is 3mm, the diameter of the spiral conductor 500 is 0.1mm-0.2mm, and an exposed area with a length of 0.2mm is formed every 3mm in the length direction of the spiral conductor 500, thereby evenly forming three pairs of opposing discharge electrodes 510 in the length direction of the entire spiral conductor 500.

[0066] At this time, when the high-voltage pulse generator outputs a 1000-5000V high-voltage pulse, the exposed area will discharge simultaneously, generating shock waves evenly distributed in the axial and circumferential directions.

[0067] Taking the latter as an example, please refer to Figure 3 , the spiral wire 500 can be designed as follows: the pitch of the spiral wire 500 changes gradually, and the pitch gradually increases in the direction from the catheter seat 100 to the tail section 310; the distance between the exposed areas gradually increases in the direction from the catheter seat 100 to the tail section 310. The pitch of the spiral wire 500 close to one end of the catheter seat 100 can be set to 2mm-2.5mm, and the pitch of the spiral wire 500 away from one end of the catheter seat 100 can be set to 3mm-3.5mm. At this time, the effect of sequential discharge in the direction from the catheter seat 100 to the tail section can be achieved.

[0068] In one embodiment, please refer to Figure 1 , the ends of the outer tube 200 and the inner tube 300 connected to the catheter seat 100 are flush.

[0069] In one embodiment, please refer to Figure 1 The catheter seat 100 includes a catheter seat body 110 and a lead-out portion 120 obliquely connected to the catheter seat body 110 , the lead-out portion 120 forms a wire channel 101 , and the catheter seat body 100 forms an infusion channel 102 .

[0070] It is understandable that the infusion channel 102 can be connected to the wire channel 101, and in this case, the catheter adapter 100 is designed to be connected to the inner tube 300 and the outer tube 200. Of course, in some embodiments, the infusion channel 102 and the wire channel 101 can also be designed to be disconnected.

[0071] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0072] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent application. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A shock wave catheter that is easy to pass through a target blood vessel, characterized in that: include: A catheter seat, wherein the catheter seat is formed with a guide wire channel and an infusion flow channel; an outer tube, one end of which is connected to the catheter seat; An inner tube, one end of which is connected to the catheter seat and sleeved in the outer tube, the tail section of the inner tube extends out of the outer tube, a tube channel is formed between the inner tube and the outer tube, and the tube channel is connected to the wire channel, and the tube channel is connected to the infusion channel; A balloon, which is sealed and sleeved on the outer periphery of the tail section and is sealed and connected to the tube channel; and at least one pair of spaced-apart spiral conductors, the spiral conductors being spirally wound around the outer periphery of the tail section, and at least one pair of the spiral conductors being formed with a plurality of pairs of exposed areas opposite to each other in the axial direction of the inner tube along the length direction of the spiral conductors, a pair of the exposed areas forming a pair of discharge electrodes.

2. The shock wave catheter that is easy to pass through the target blood vessel as claimed in claim 1, characterized in that: It also includes a lead-out wire, which is connected to the spiral wire and passes through the tube channel and the wire channel in sequence.

3. The shock wave catheter that is easy to pass through the target blood vessel as claimed in claim 1, characterized in that: The spiral wire is formed by winding an integral wire on the tail section in a spiral manner.

4. The shock wave catheter that is easy to pass through a target blood vessel according to any one of claims 1 to 3, characterized in that: The spiral conductor comprises an inner core and an insulating layer sleeved on the outer periphery of the inner core, and the insulating layer is made of PI or PTFE.

5. The shock wave catheter that is easy to pass through the target blood vessel as claimed in claim 4, characterized in that: The cross section of the inner core is circular or flat oval.

6. The shock wave catheter that is easy to pass through the target blood vessel as claimed in claim 4, characterized in that: The inner core is made of tungsten or nickel-titanium or stainless steel.

7. The shock wave catheter that is easy to pass through a target blood vessel according to any one of claims 1 to 3, characterized in that: The pitch of the spiral wire remains unchanged, the spacing between a pair of the spiral wires is 0.1mm, the pitch is 3mm, the diameter of the spiral wire is 0.1mm-0.2mm, and an exposed area with a length of 0.2mm is formed every 3mm in the length direction of the spiral wire, thereby evenly forming three pairs of relative discharge electrodes in the length direction of the entire spiral wire.

8. The shock wave catheter that is easy to pass through a target blood vessel according to any one of claims 1 to 3, characterized in that: The pitch of the spiral guide wire changes gradually, and in the direction from the catheter seat to the tail section, the pitch gradually increases; in the direction from the catheter seat to the tail section, the distance between the exposed areas gradually increases.

9. The shock wave catheter that is easy to pass through a target blood vessel according to any one of claims 1 to 3, characterized in that: The ends of the outer tube and the inner tube connected to the catheter seat are flush.

10. The shock wave catheter that is easy to pass through a target blood vessel according to any one of claims 1 to 3, characterized in that: The catheter seat comprises a catheter seat body and a lead-out portion obliquely connected to the catheter seat body, the lead-out portion forms the wire channel, and the catheter seat body forms the infusion channel.

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