Passageway catheter with balloon

Abstract

The utility model discloses an access catheter with a balloon, which relates to the technical field of medical instruments and comprises a catheter seat, a balloon, a balloon and a balloon, one end of the catheter is arranged in the channel cavity, the catheter comprises an inner tube and an outer tube, a circulation channel is arranged between the outer tube and the inner tube, the circulation channel is communicated with the circulation cavity, and an inner cavity of the inner tube is communicated with the channel cavity; the outer tube is sleeved with the balloon, one end of the balloon is fixedly connected with the end of the outer tube, and the other end of the balloon is fixedly connected with the inner tube, so that a balloon cavity of the balloon is communicated with the circulation channel; the length between the far end of the inner tube and the wall of the balloon is set to be L, the circumference of the catheter reaches or exceeds 5 mm, and L is at least 20 mm. According to the access catheter with the balloon, the technical problems that an existing access catheter cannot achieve blood flow blocking, and the far end of the existing access catheter cannot reach the interior of the M2 section easily are solved, the access catheter can achieve blood flow blocking in an operation, the far end of the existing access catheter can reach the interior of the M2 section, and the safety and reliability of stent thrombus extraction are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to medical instrument technical field, especially a kind of access catheter with balloon. BACKGROUND

[0002] In neurointerventional surgery, access catheter as a kind of key medical instrument is widely used in various treatment processes.

[0003] When treating intracranial vascular diseases such as aneurysm and vascular stenosis through interventional surgery, it is necessary to establish a vascular access through the access catheter for therapeutic instruments (such as thrombectomy stent, intracranial balloon catheter, etc.) to reach the target vascular position. The existing access catheter limits its use effect in complex vascular environment. Specifically, when the patient has a bleeding condition, the existing access catheter lacks an effective blood flow blocking mechanism, making it difficult to quickly control bleeding and increasing the risk of surgery.

[0004] And the middle cerebral artery (MCA) includes M1 segment and M2 segment:

[0005] M1 segment: starting from the bifurcation of internal carotid artery, extending along the horizontal segment of lateral fissure of cerebrum, M1 segment is a relatively wide and straight part, which allows the access catheter to effectively block blood flow when expanded, and helps prevent thrombus from moving distally after detachment during thrombectomy surgery.

[0006] M2 segment: starting from the end of M1 segment, extending into the lateral fissure, M2 segment is a plurality of thin branches with more tortuous vascular course. If the balloon catheter enters M2 segment, the operation difficulty will increase significantly, and there is a high risk of causing vascular injury.

[0007] When the thrombus is located in M2 segment, the distal end of the existing access catheter cannot extend into M2 segment, thereby affecting the effectiveness of thrombectomy surgery. Specifically:

[0008] When the circumference of the access catheter is 5mm: although it can extend into M2 segment, the balloon is not safe to expand in M2 segment, which may cause rupture of blood vessels.

[0009] When the circumference of the access catheter is greater than 5mm: the larger the circumference, the larger the tube diameter, and when the balloon expands in M1 segment, the distance between the distal end of the tube and the distal end of the balloon is small, which causes the distal end of the tube to be unable to extend into M2 segment, thereby affecting the working effect of thrombectomy stent and intracranial balloon catheter.

[0010] In view of the above problems, how to provide an access catheter with balloon, which can block blood flow and improve the effectiveness of M1 and M2 segment operation in intracranial thrombectomy surgery, is a technical problem that needs to be solved by those skilled in the art at present. UTILITY MODEL CONTENT

[0011] The utility model discloses a kind of passage catheters with balloon, solve the technical problem that current passage catheter cannot realize blood flow blockage and distal end cannot reach M2 section.

[0012] To achieve the above object, the utility model provides a kind of passage catheters with balloon, including catheter seat, including passage cavity and flow cavity;

[0013] Catheter, one end is arranged in the passage cavity, the catheter includes inner tube and outer tube, the outer tube is sleeved on the outside of the inner tube, flow passage is equipped between the outer tube and the inner tube, the flow passage is communicated with the flow cavity, the inner cavity of the inner tube is communicated with the passage cavity;

[0014] Balloon, sleeve is set on the outer tube, one end of the balloon is fixedly connected with the end of the outer tube, the other end is fixedly connected with the inner tube, so that the balloon cavity of the balloon is communicated with the flow passage, so that the fluid in the flow cavity is injected into the balloon cavity in the flow passage;

[0015] Preferably, the length between the distal end of the inner tube and the balloon wall of the balloon is L, the circumference of the catheter reaches or exceeds 5mm, and the L is at least 20mm.

[0016] Preferably, the circumference of the catheter is 6mm, and the wall thickness of the inner tube is 0.5-0.7mm.

[0017] Preferably, the pipe diameter of the inner tube is 0.07-0.1mm.

[0018] Preferably, the inner tube is PTFE tube.

[0019] Preferably, the length of the catheter is 500-1350mm.

[0020] Preferably, the length of the catheter is 1300mm.

[0021] Preferably, the length of the balloon is 5-25mm, the diameter is 6-11.5mm, and the filling volume is 0.2-0.6ml.

[0022] Preferably, the length of the balloon is 20mm.

[0023] Preferably, the surface of the balloon is provided with lubricating coating or anti-thrombus coating.

[0024] Preferably, the connection of the balloon and the inner tube and the outer tube is adhesive connection.

[0025] Compared to the aforementioned background technology, this utility model provides a balloon-equipped access catheter. After inserting the balloon into a designated position via the catheter, the balloon is located in segment M1. Thrombectomy is then performed through the access cavity. The balloon is inflated with contrast agent or saline through the flow cavity to seal the blood flow. The balloon-equipped access catheter provided in this application has a length that is correspondingly increased from the distal end of the inner tube to the balloon wall according to the circumference of the catheter. This allows the distal end of the inner tube to extend into segment M2 of the blood vessel while the balloon is expanding and sealing in segment M1. This ensures safe balloon expansion in segment M1, reduces the risk of vascular rupture due to expansion in segment M2, lowers surgical risks, and improves aspiration efficiency, thereby enhancing the safety and reliability of stent thrombectomy. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the intracranial vascular structure provided in an embodiment of the present invention;

[0028] Figure 2 A schematic diagram of the balloon-loaded access catheter structure provided in an embodiment of this utility model;

[0029] Figure 3 for Figure 2 A magnified view of a portion of the image;

[0030] Figure 4 A schematic diagram showing the combination of the balloon-loaded access catheter and the thrombectomy assembly provided in an embodiment of this utility model;

[0031] Figure 5 This is a schematic diagram of intracranial stent thrombectomy provided in an embodiment of the present invention.

[0032] in:

[0033] 1-Catheter hub, 2-Catheter, 3-Balloon, 4-Thrombectomy assembly;

[0034] 11-Channel cavity, 12-Flow cavity, 21-Inner tube, 22-Outer tube, 23-Flow channel, 41-Intracranial balloon catheter, 42-Thrombectomy stent. Detailed Implementation

[0035] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0036] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0037] See Figures 2-3 This application provides a balloon-equipped access catheter, comprising a catheter seat 1, including a channel cavity 11 and a flow cavity 12; a catheter 2, one end of which is disposed within the channel cavity 11, the catheter 2 including an inner tube 21 and an outer tube 22, the outer tube 22 being sleeved on the outside of the inner tube 21, a flow channel 23 being provided between the outer tube 22 and the inner tube 21, the flow channel 23 communicating with the flow cavity 12, and the inner cavity of the inner tube 21 communicating with the channel cavity 11; a balloon 3, sleeved on the outer tube 22, one end of the balloon 3 being fixedly connected to the end of the outer tube 22, and the other end being fixedly connected to the inner tube 21, such that the balloon cavity of the balloon 3 is connected to the flow channel 23, so that fluid in the flow cavity 12 is injected into the balloon cavity of the balloon 3 through the flow channel 23; wherein, the length between the distal end of the inner tube 21 and the balloon wall of the balloon 3 is defined as L, the circumference of the catheter 2 is 5 mm or more, and L is at least 20 mm.

[0038] Specifically, the catheter seat 1 has a Y-shaped structure with branches inclined downwards. The catheter seat 1 has a channel cavity 11 extending through it in the horizontal direction, and a through flow cavity 12 is provided on the branch.

[0039] The catheter 2 includes an inner tube 21 and an outer tube 22. A flow channel 23 is provided between the inner tube 21 and the outer tube 22. The outer tube 22 is sleeved on the outside of the inner tube 21, and the length of the outer tube 22 is less than the length of the inner tube 21. An arc-shaped section is provided at the middle end of the channel cavity 11. The right end of the outer tube 22 abuts against the edge of the arc-shaped end. Thus, the channel cavity 11 and the flow cavity 12 are not connected to each other because of the inner tube 21. The end of the outer tube 22 facing the catheter seat 1 is sealed to the inner wall of the channel cavity 11, and the end of the outer tube 22 is located at the upper opening edge of the flow cavity 12. Thus, the flow channel is connected to the flow cavity 12 of the catheter seat 1. The inner lumen of the inner tube 21 is connected to the channel cavity 11. It is used to transmit necessary medical tools, such as the thrombectomy component 4.

[0040] The balloon 3 is fitted onto the outer tube 22. Its right end is fixedly and sealed to the left end of the outer tube 22, and its left end is fixedly connected to the inner tube 21. The above connection method allows the balloon cavity of the balloon 3 to communicate with the flow channel 23, thereby allowing the fluid in the flow cavity 12 to be injected into the balloon cavity of the balloon 3 through the flow channel 23, so as to realize the expansion and contraction of the balloon.

[0041] The length between the distal end of the inner tube 21 and the balloon wall of the balloon 3 is L (the distal end of the inner tube 21 is the end away from the catheter seat 1). In this embodiment, when the circumference of the catheter 2 reaches 5mm, L is 20mm.

[0042] See Figure 5 In specific operation, after inserting balloon 3 to the designated position through catheter 2, balloon 3 is located in segment M1. The balloon 3 is then inflated with contrast agent or saline through the flow cavity 12 to block the blood flow. Thrombectomy is then performed through the channel cavity 11. The balloon-equipped access catheter provided in this application has an extended length between the distal end of the inner tube 21 and the balloon wall, corresponding to the circumference of catheter 2. This allows the distal end of the inner tube 21 to extend into segment M2 of the blood vessel when balloon 3 is inflated and blocked in segment M1. This ensures safe inflation of balloon 3 in segment M1, reduces the risk of vascular rupture during inflation in segment M2, lowers surgical risks, and improves the effectiveness of intracranial balloon catheterization.

[0043] Similarly, when the circumference of catheter 2 is 6mm, the length between the distal end of inner tube 21 and the balloon wall of balloon 3 is 3mm, thus allowing the operator to select the appropriate catheter 2 according to the patient's vascular condition.

[0044] Based on the above embodiments, see Figure 4 The thrombectomy assembly 4 includes an intracranial balloon catheter 41, which can pass through the lumen of the inner tube 21 and is used to safely and accurately guide the thrombectomy stent 42 to the thrombus location within the blood vessel.

[0045] The procedure is as follows: First, catheter 2 (containing balloon 3) is inserted into the designated location of the intracranial blood vessel, ensuring that balloon 3 is located in segment M1. Under the guidance of the corresponding guidewire, intracranial balloon catheter 41 is advanced to the thrombus location. The guidewire provides additional support and guidance to ensure that the distal end of intracranial balloon catheter 41 can accurately reach the distal end of the thrombus. Thrombectomy stent 43 unfolds and merges into the thrombus, achieving encapsulation and fixation of the thrombus. After thrombectomy stent 43 has fully merged with the thrombus, the thrombectomy stent 43 and the encapsulated thrombus are withdrawn together into catheter 2. At this time, a strong suction can be performed through catheter 2 to further ensure the patency of the blood vessel. If bleeding occurs during the operation, balloon 3 is inflated through the flow lumen of catheter 2 to block blood flow in segment M1.

[0046] like Figure 3 As shown, since balloon 3 is located in segment M1, and when balloon 3 is inflated, the blood vessel from the thrombus to the balloon is sealed, which improves the aspiration effect.

[0047] Based on the above embodiments, in order to meet the strength of catheter 2 while maintaining flexibility and operability, when the circumference of catheter 2 is 6mm, the wall thickness of the inner tube is designed to be in the range of 0.5 mm to 0.7 mm. Catheter 2 within the above wall thickness range can ensure that the catheter is not easily broken or deformed during insertion and operation, and can also maintain its sufficient flexibility to adapt to the bending and changes of blood vessels.

[0048] Choosing polytetrafluoroethylene or polyurethane as the material for catheter 2 can significantly improve the performance and safety of the catheter in intracranial thrombectomy.

[0049] Based on the above embodiments, the diameter of the inner tube 21 is designed to be 0.07-0.1 mm to ensure that the intracranial balloon catheter 41 can pass smoothly. Therefore, the diameter of the inner tube 21 needs to be large enough to allow the intracranial balloon catheter 41 to pass through, while also being small enough to maintain the flexibility of the catheter 2.

[0050] The material of the inner tube 21 needs to have good biocompatibility to ensure that it will not cause adverse reactions or rejection reactions when in contact with blood and tissues for a long time. It also needs to withstand a certain amount of pressure and tension to ensure that it will not break or deform during insertion, operation and withdrawal. It also needs to have low friction to reduce friction and resistance to the intracranial balloon catheter 41 and improve the efficiency and safety of the operation.

[0051] By selecting polytetrafluoroethylene (PTFE) as the material for the inner tube 21 in this application, it possesses all the advantages mentioned above: good biocompatibility, preventing adverse reactions; high mechanical strength, capable of withstanding certain pressure and tension; excellent flexibility, adapting to the bending and changes of blood vessels; and most importantly, PTFE has extremely low friction, which makes the inner tube 21 more smoothly guide the intracranial balloon catheter 41, reducing resistance and friction during the operation and improving the efficiency and safety of the operation.

[0052] Based on the above embodiments, different patients may have different blood vessel lengths and curvatures. Therefore, catheter 2 needs to have a certain length range to accommodate different individual differences. The length range of catheter 2 is designed to be 500-1350mm to ensure that catheter 2 can smoothly reach different target locations of intracranial blood vessels while maintaining good operability and safety.

[0053] In this embodiment, the length of catheter 2 is 1300mm, which is a specific choice within the aforementioned length range. This allows the surgeon to manipulate the catheter more flexibly during the operation, adjusting its position and angle to adapt to different surgical needs. This helps to ensure the smooth progress of the operation, improve the success rate, and reduce the risk of intraoperative complications.

[0054] Based on the above embodiments, the balloon has a length of 5-25 mm, a diameter of 6-11.5 mm, and an inflation volume of 0.2-0.6 ml. Specifically, the balloon has a length of 20 mm.

[0055] Specifically, the material of balloon 3 needs to have good compliance to adapt to the tortuosity and changes of blood vessels; at the same time, it also needs to have sufficient durability to ensure that it will not rupture or deform during repeated expansion and retrieval. In addition, the biocompatibility of the material is also crucial to avoid causing adverse reactions or rejection reactions.

[0056] The balloon material can be selected from polyurethane, nylon, and silicone rubber. All of these materials have good physical properties and biocompatibility, which can meet the needs of surgery.

[0057] To reduce the chance of blood clotting on the surface of balloon 3 and improve the passage of catheter 2 through the blood, a lubricating coating or an anti-thrombotic coating can be applied to the surface of balloon 3. The lubricating coating can reduce the friction between the balloon and the blood vessel wall, making it easier for balloon 3 to pass through the blood vessel; while the anti-thrombotic coating can reduce the formation of thrombi and reduce surgical risks.

[0058] In this embodiment, selecting a 20mm long balloon 3, along with an appropriate diameter and inflation volume, helps improve the smoothness and success rate of the surgery. Simultaneously, by incorporating surface treatment techniques such as a lubricating coating or an anti-thrombotic coating, surgical risks can be further reduced, enhancing patient safety.

[0059] It should be noted that in this specification, relational terms such as first and second are used only to distinguish one entity from several other entities, and do not necessarily require or imply any such actual relationship or order between these entities.

[0060] This article uses specific examples to illustrate the principles and implementation methods of this utility model. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made to this utility model without departing from the principles of this utility model, and these improvements and modifications also fall within the protection scope of the claims of this utility model.

Claims

1. A balloon-loaded access catheter, characterized in that, The application relates to a catheter, which comprises: a catheter seat (1) comprising a channel cavity (11) and a flow cavity (12); a catheter (2) arranged at one end in the channel cavity (11), the catheter (2) comprising an inner tube (21) and an outer tube (22), the outer tube (22) being arranged on the outer side of the inner tube (21), a flow channel (23) being arranged between the outer tube (22) and the inner tube (21), the flow channel (23) being in communication with the flow cavity (12), and the inner cavity of the inner tube (21) being in communication with the channel cavity (11); a balloon (3) arranged on the outer tube (22), one end of the balloon (3) being fixedly connected with the end of the outer tube (22), and the other end being fixedly connected with the inner tube (21), so that the balloon cavity of the balloon (3) is in communication with the flow channel (23), and the fluid in the flow cavity (12) is injected into the balloon cavity of the balloon (3) through the flow channel (23); wherein the length between the distal end of the inner tube (21) and the balloon wall of the balloon (3) is L, the circumference of the catheter (2) is greater than or equal to 5 mm, and the L is at least 20 mm.

2. The balloon catheter of claim 1, wherein, The circumference of the catheter (2) is 6 mm, and the wall thickness of the inner tube is 0.5-0.7 mm.

3. The balloon catheter of claim 2, wherein, The tube diameter of the inner tube (21) is 0.07-0.1 mm.

4. The balloon catheter of claim 3, wherein, The inner tube (21) is a PTFE tube.

5. The balloon catheter of claim 1, wherein, The length of the catheter (2) is 500-1350 mm.

6. The balloon catheter of claim 5, wherein, The length of the catheter (2) is 1300 mm.

7. The balloon catheter of claim 1, wherein, The length of the balloon (3) is 5-25 mm, the diameter is 6-11.5 mm, and the filling volume is 0.2-0.6 ml.

8. The balloon catheter of claim 7, wherein, The length of the balloon (3) is 20 mm.

9. The balloon catheter of claim 8, wherein, The surface of the balloon (3) is provided with a lubricating coating or an anti-thrombus coating.

10. The balloon catheter of claim 1, wherein, The connection between the balloon (3) and the inner tube (21) and the outer tube (22) is an adhesive connection.

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