Novel thrombus aspiration catheter

Abstract

The utility model discloses a novel thrombus aspiration catheter. The utility model has the beneficial effects that the separator and the catheter are respectively designed into independent structures, the separator can be independently controlled to cut and capture thrombus, then the thrombus is cleared through the suction catheter, and the device is suitable for thrombus treatment of roundabout paths and blood vessel branch parts; the catheter is designed to be of a double-cavity structure, a thrombus suction cavity and an injection cavity are separated and do not affect each other, accurate injection can be conducted, treatment of medicine on thrombus is effectively improved, normal saline can be injected through the injection cavity to form a suction loop, the suction volume is effectively controlled, and controllability is improved; according to the thrombus extraction device, stent thrombus extraction, thrombus suction, medicine dissolution and other thrombus extraction modes are integrated, meanwhile, the advantages of the stent thrombus extraction, thrombus suction, medicine dissolution and other thrombus extraction modes are kept, the defects are avoided, an integrated thrombus extraction structure is truly achieved, more choices are provided for doctors in an operation, optimal choices can be selected according to the conditions in the operation, the operation risk is greatly reduced, and the pain of patients is relieved.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, specifically to a novel thrombus aspiration catheter. Background Technology

[0002] Current thrombus aspiration catheters mainly consist of integrated aspiration catheters, balloon aspiration catheters, and aspiration catheters composed of a drive assembly and a catheter assembly. While all three types of aspiration catheters can remove thrombi from blood vessels, integrated aspiration catheters require smaller sizes for smaller diameter vessels, and the aspiration efficiency of small-sized catheters with integrated stent structures is significantly reduced. Furthermore, for thrombi in some malformed or branch vessel locations, this structure is still unable to effectively treat thrombi in these locations due to catheter size limitations. This structure also lacks a dedicated channel for drug dissolution, making it impossible to control the effectiveness and accuracy of drug injection. Balloon aspiration catheters require first delivering the balloon to the thrombus site, then inflating the balloon before pulling the thrombus out. Returning to the catheter position, a compliant balloon is generally used. Compared with interventional therapy, this method is relatively more invasive. During thrombectomy or subsequent management, bleeding may occur at the vascular incision site, often requiring blood flow occlusion to control the bleeding. However, while controlling bleeding, the risk of new thrombus formation must be considered, necessitating careful planning of the surgical steps and timely control of the surgical progress. Catheter thrombectomy sometimes presents difficulties in catheter movement within the blood vessel, especially in cases of severe stenosis, tortuous vessels, and at anastomotic sites. Therefore, intraoperative ultrasound guidance may be necessary. New stenosis may occur after suturing the incised vascular site. The aspiration catheter, composed of a drive assembly and a catheter assembly, is limited to use only for larger diameter vessels. Furthermore, controlling the outer diameter of the basket structure is difficult. The drive assembly requires high rotation speeds, which can easily damage the vessel, resulting in a low surgical error margin. Moreover, this structure is very complex, the manufacturing process is cumbersome, installation is difficult, and production efficiency is low. Utility Model Content

[0003] (a) Technical problems to be solved

[0004] The technical problem to be solved by this utility model is to provide a novel thrombus aspiration catheter that integrates thrombus retrieval methods such as stent thrombectomy, thrombus aspiration, and drug dissolution, while maintaining the advantages of each method and avoiding their disadvantages, thus achieving a truly integrated thrombectomy.

[0005] (II) Technical Solution

[0006] This utility model is achieved through the following technical solution: This utility model proposes a novel thrombus aspiration catheter, including a separator. The pull-out end of the separator is equipped with an aspiration catheter. The separator includes a metal ball head, a contrast spring installed on one side of the metal ball head, a distal structure installed on the end of the contrast spring away from the metal ball head, a pull rod penetrating the middle of the distal structure, a contrast ring installed on the end of the distal structure away from the contrast spring, and a metal tube installed on the side of the contrast ring facing away from the distal structure. A liquid injection chamber is reserved in the middle of the aspiration catheter, and a thrombus aspiration chamber is reserved outside the liquid injection chamber in the aspiration catheter.

[0007] Furthermore, the distal structure is a mesh structure woven from multiple strands of metal wire or polymer filaments, or a mixture of both in a certain proportion.

[0008] By adopting the above technical solution, the distal structure is mainly used for the removal and capture of thrombi, and works in conjunction with the aspiration catheter to aspirate thrombi, while also clearing thrombi from some malformed and narrowed blood vessels.

[0009] Furthermore, the pull rod is fixedly connected to the metal ball head, and the pull rod passes through the metal tube and is slidably connected to the metal tube.

[0010] By adopting the above technical solution, the pull rod is mainly used to realize the opening and closing of the remote structure.

[0011] Furthermore, both the injection chamber and the thrombus aspiration chamber are formed on the aspiration catheter.

[0012] By adopting the above technical solution, thrombolytic agents or saline can be injected through the injection chamber, while forming an injection and aspiration circuit with the thrombus aspiration chamber, thereby increasing the aspiration effect, improving aspiration efficiency, and reducing the risk of tube blockage during the aspiration process.

[0013] Furthermore, the distal structure is welded to both the developing spring and the developing ring, and the metal tube is fixedly connected to the suction conduit.

[0014] By adopting the above technical solution, the imaging ring is used to determine the position of the instrument in the body and the open state of the distal structure.

[0015] Furthermore, the developing spring is made of platinum-tungsten alloy, and the developing spring is welded to the metal ball head.

[0016] By adopting the above technical solution, the imaging spring is also mainly used to determine the position of the instrument in the body and the open state of the distal structure.

[0017] Furthermore, the developing ring is made of platinum-iridium alloy, and the developing ring is welded to the metal tube.

[0018] By adopting the above technical solution, a reliable connection between the developing ring and the metal tube can be ensured.

[0019] Furthermore, the metal tube is made of nickel-titanium, and its inner diameter is larger than the outer diameter of the pull rod.

[0020] By adopting the above technical solution, the metal tube can have good shape memory characteristics, while facilitating the convenient pulling of the pull rod.

[0021] (III) Beneficial Effects

[0022] Compared with the prior art, this utility model has the following advantages:

[0023] To address the limitations of existing thrombectomy catheters, which fail to achieve truly integrated thrombectomy and are prone to damaging blood vessels, increasing surgical risks and patient discomfort, this invention designs the separator and catheter as separate structures. The separator can be independently controlled for thrombus cutting and capture, followed by thrombus removal via the aspiration catheter. This design is suitable for thrombus treatment in tortuous pathways and vascular branches. The catheter features a dual-lumen structure, with separate aspiration and injection chambers that do not interfere with each other. This allows for accurate injection and improved drug treatment of thrombi. Furthermore, the injection chamber can be used to inject saline to form an aspiration loop, effectively controlling the aspiration volume and increasing controllability. By integrating stent thrombectomy, thrombectomy, and drug dissolution methods while retaining their respective advantages and avoiding their disadvantages, this invention achieves a truly integrated thrombectomy structure. This provides surgeons with more options during the procedure, allowing for optimal selection based on intraoperative conditions, significantly reducing surgical risks and patient discomfort. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of a novel thrombus aspiration catheter described in this utility model;

[0025] Figure 2 This is a schematic diagram of the separator in the novel thrombus aspiration catheter of this utility model when it is released at the distal end.

[0026] Figure 3 This is a schematic diagram of the aspiration catheter in the novel thrombus aspiration catheter described in this utility model;

[0027] Figure 4 This is a schematic diagram of the separator in the novel thrombus aspiration catheter of this utility model when the distal structure is not released;

[0028] Figure 5 This is a schematic diagram of the structure of the novel thrombus aspiration catheter described in this utility model during thrombus removal;

[0029] Figure 6 This is a schematic diagram of the structure of the novel thrombus aspiration catheter described in this utility model when capturing distal thrombi;

[0030] Figure 7 This is a schematic diagram of the structure of the novel thrombus aspiration catheter described in this utility model during injection aspiration.

[0031] The annotations in the attached figures are explained as follows:

[0032] 1. Separator; 101. Metal ball head; 102. Distal structure; 103. Metal tube; 104. Imaging spring; 105. Pull rod; 106. Imaging ring; 2. Aspiration catheter; 201. Thrombus aspiration chamber; 202. Injection chamber. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0034] like Figures 1-7 As shown, a novel thrombus aspiration catheter in this embodiment includes a separator 1. An aspiration catheter 2 is installed at the pull-out end of the separator 1. The separator 1 includes a metal ball head 101, a contrast-enhancing spring 104 installed on one side of the metal ball head 101, a distal structure 102 installed at the end of the contrast-enhancing spring 104 away from the metal ball head 101, a pull rod 105 penetrating the middle of the distal structure 102, a contrast-enhancing ring 106 installed at the end of the distal structure 102 away from the contrast-enhancing spring 104, and a metal tube 103 installed on the side of the contrast-enhancing ring 106 opposite to the distal structure 102. An injection chamber is pre-reserved in the middle of the aspiration catheter 2. 202. The distal structure 102 is mainly used for thrombus removal and capture, and works with the aspiration catheter 2 to aspirate thrombi. It also clears thrombi in some malformed and narrowed blood vessels. The aspiration catheter 2 has a thrombus aspiration chamber 201 reserved outside the injection chamber 202. The aspiration catheter 2 is used for liquid injection and thrombus aspiration. It has good pushing, bending, anti-collapse and surface lubrication properties. Thrombolytic agents or normal saline can be injected with the help of the injection chamber 202. At the same time, it forms an injection and aspiration circuit with the thrombus aspiration chamber 201, which increases the aspiration effect, improves the aspiration efficiency, and reduces the risk of tube blockage during the aspiration process.

[0035] like Figure 1 , Figure 2 , Figure 4 , Figure 5 and Figure 6As shown, in this embodiment, the distal structure 102 is a mesh structure woven from multiple strands of metal wire or polymer filaments or a mixture of both in a certain proportion. The pull rod 105 is fixedly connected to the metal ball head 101. The pull rod 105 passes through the metal tube 103 and is slidably connected to the metal tube 103. The pull rod 105 is mainly used to realize the opening and closing of the distal structure 102.

[0036] like Figure 1 , Figure 3 , Figure 5 and Figure 6 As shown, in this embodiment, the injection chamber 202 and the thrombus aspiration chamber 201 are both formed on the aspiration catheter 2. The distal structure 102 is welded to the imaging spring 104 and the imaging ring 106. The metal tube 103 is fixedly connected to the aspiration catheter 2. The imaging ring 106 is used to determine the position of the device in the body and the open state of the distal structure 102.

[0037] like Figure 1 , Figure 2 , Figure 4 , Figure 5 and Figure 6 As shown, in this embodiment, the developing spring 104 is made of platinum-tungsten alloy and is welded to the metal ball head 101. The developing spring 104 is mainly used to determine the position of the instrument in the body and the open state of the distal structure 102. The developing ring 106 is made of platinum-iridium alloy and is welded to the metal tube 103 to ensure a reliable connection between the developing ring 106 and the metal tube 103. The metal tube 103 is made of nickel-titanium alloy and has an inner diameter larger than the outer diameter of the pull rod 105, which gives the metal tube 103 good shape memory characteristics and facilitates the easy pulling of the pull rod 105.

[0038] The specific implementation process of this embodiment is as follows: During the operation, the aspiration catheter 2 is delivered to the thrombus location, and then the separator 1 is delivered to the thrombus location through the aspiration catheter 2. At this time, the distal structure 102 on the separator 1 is in a retracted state. The metal tube 103 is pushed back and forth to make the distal structure 102 pass through the thrombus. The metal tube 103 is fixed and the pull rod 105 is pulled towards the aspiration catheter 2 so that the distal structure 102 is in a spherical state. Then, the separator 1 is pulled towards the aspiration catheter 2. At this time, the distal structure 102 drives the thrombus to move towards the aspiration catheter 2 and is aspirated through the aspiration catheter 2. In vitro, for large thrombi or thrombi fixed to the blood vessel wall, the separator 1 can be rotated left and right during movement to remove the thrombus. Alternatively, thrombolytic agents can be injected into the liquid cavity of the aspiration catheter 2 before aspiration. The distal structure 102 is made of round metal wire and has a certain degree of flexibility, so it will not damage the blood vessel wall. In addition, for vascular malformations or for some branch blood vessels where the aspiration catheter 2 cannot directly reach the thrombus location, the thrombus can be captured within a certain range through the distal structure 102 on the separator 1 and removed in conjunction with the aspiration catheter 2.

[0039] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A novel thrombus aspiration catheter, characterized in that: The device includes a separator (1), and a suction catheter (2) is installed at the pull-out end of the separator (1). The separator (1) includes a metal ball head (101), a contrast spring (104) installed on one side of the metal ball head (101), a distal structure (102) installed on the end of the contrast spring (104) away from the metal ball head (101), a pull rod (105) penetrating the middle of the distal structure (102), a contrast ring (106) installed on the end of the distal structure (102) away from the contrast spring (104), and a metal tube (103) installed on the side of the contrast ring (106) facing away from the distal structure (102). A liquid injection chamber (202) is reserved in the middle of the suction catheter (2), and a thrombus aspiration chamber (201) is reserved outside the liquid injection chamber (202) in the suction catheter (2).

2. The novel thrombus aspiration catheter according to claim 1, characterized in that: The distal structure (102) is a mesh structure woven from multiple strands of metal wire or polymer filaments, or a mixture of both in a certain proportion.

3. The novel thrombus aspiration catheter according to claim 1, characterized in that: The pull rod (105) is fixedly connected to the metal ball head (101), and the pull rod (105) passes through the metal tube (103) and is slidably connected to the metal tube (103).

4. The novel thrombus aspiration catheter according to claim 1, characterized in that: The injection chamber (202) and the thrombus aspiration chamber (201) are both formed on the aspiration catheter (2).

5. A novel thrombus aspiration catheter according to claim 2, characterized in that: The distal structure (102) is welded to the developing spring (104) and the developing ring (106), and the metal tube (103) is fixedly connected to the suction conduit (2).

6. The novel thrombus aspiration catheter according to claim 1, characterized in that: The developing spring (104) is made of platinum-tungsten alloy and is welded to the metal ball head (101).

7. The novel thrombus aspiration catheter according to claim 1, characterized in that: The developing ring (106) is made of platinum-iridium alloy and is welded to the metal tube (103).

8. A novel thrombus aspiration catheter according to claim 3, characterized in that: The metal tube (103) is made of nickel-titanium, and the inner diameter of the metal tube (103) is larger than the outer diameter of the pull rod (105).

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