A detachable balloon microcatheter

Abstract

This utility model relates to the field of medical device technology, and in particular to a detachable balloon microcatheter. The detachable balloon microcatheter includes a distal end, an inner tube, an outer tube, and a balloon. The inner tube is coaxially arranged with the distal end, and its first end is detachable from the distal end. The outer tube is coaxially arranged with the inner tube and sleeved on the inner tube, with a cavity formed between the inner wall of the outer tube and the outer wall of the inner tube. The balloon communicates with the cavity. The first end of the balloon is connected to the end of the outer tube near the distal end, and the second end of the balloon is connected to the outer wall of the inner tube. This utility model combines the functions of both balloon catheters and detachable catheters, namely, it has multiple functions such as dilating blood vessels, temporarily blocking blood flow, and injecting liquid embolic agents or gels into malformed blood vessels. Therefore, compared with balloon catheters and detachable catheters currently on the market, the detachable balloon microcatheter of this application has a wider range of applications, especially for embolization of complex malformed blood vessels and arteriovenous fistulas, where it has significant advantages.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, and in particular to a detachable balloon microcatheter. Background Technology

[0002] Arteriovenous malformations (AVMs) and arteriovenous fistulas (AVFs) are common congenital intracranial vascular diseases. Treatment methods mainly include surgical resection, endovascular embolization, and stereotactic radiotherapy. In recent years, with the advancement of embolization materials and technologies, the application of novel liquid embolization agents (Onyx, Phil, etc., hereinafter referred to as "glue") via endovascular embolization has become an important method for treating cerebral AVMs and AVFs. During the embolization process, due to the pressure-directed nature of the glue, there is a risk of reflux at the tip of the microcatheter, leading to serious complications such as hemorrhage of the malformation mass and catheter indwelling.

[0003] Currently, the main clinical products for treating cerebral arteriovenous malformations and fistulas are microcatheters with detachable tips. The application of these products significantly reduces the difficulty of catheter removal and related complications. However, in cases of vascular stenosis, balloon catheters are often needed for dilation and temporary occlusion of the vessel. This dual-catheter approach increases the complexity of the procedure, the complication rate, and the cost.

[0004] Therefore, there is a need to provide an improved technical solution that addresses the shortcomings of the existing technology. Utility Model Content

[0005] The present invention aims to solve at least one of the technical problems existing in the prior art or related technologies.

[0006] Therefore, this utility model provides a detachable balloon microcatheter that combines the application functions of balloon catheters and detachable catheters, namely, it has multiple functions such as dilating blood vessels, temporarily blocking blood flow, and injecting liquid embolic agents or gels into malformed blood vessels.

[0007] A detachable balloon microcatheter according to an embodiment of the present invention includes:

[0008] End cap;

[0009] The inner tube is coaxially arranged with the end tube head, and the first end of the inner tube can be detached from the end tube head.

[0010] The outer tube is coaxially arranged with the inner tube and is sleeved on the inner tube. The inner wall of the outer tube and the outer wall of the inner tube form a cavity.

[0011] The balloon is connected to the cavity; the first end of the balloon is connected to the end of the outer tube near the end tip, and the second end of the balloon is connected to the outer wall of the inner tube.

[0012] Optionally, the first end of the inner tube is detachably connected to the end tube head via a detachable component, the detachable component including:

[0013] TPU tubing is fitted onto the inner tube and end caps, and is interference-fitted to both the inner tube and end caps.

[0014] Optionally, the outer diameter of the end tube is slightly smaller than the outer diameter of the inner tube; after the TPU hose is interference-fitted with both the inner tube and the end tube, the first end of the inner tube contacts the end of the end tube.

[0015] Optionally, a first radiopaque ring is fitted at the end of the inner tube near the end tube head; a second radiopaque ring is fitted at the end of the end tube head away from the inner tube; and a third radiopaque ring is fitted at each corresponding position of the inner tube and the balloon.

[0016] Optionally, the balloon is a cylindrical balloon.

[0017] Optionally, it also includes a Y-shaped Luer seat, which is connected to the end of the outer tube away from the end of the tube head; the second end of the inner tube extends into the interior of the Y-shaped Luer seat and communicates with the inlet cavity on the main Luer connector of the Y-shaped Luer seat.

[0018] Optionally, the Y-shaped Luer seat is also provided with a channel cavity that communicates with the inlet cavity. The axis of the channel cavity, the axis of the inlet cavity, and the axis of the outer tube are all on the same straight line. The channel cavity is connected to the outer tube, and the second end of the inner tube can pass through the channel cavity and communicate with the inlet cavity.

[0019] Optionally, the channel cavity includes a first channel segment and a second channel segment that are coaxially arranged and connected. One end of the first channel segment is connected to the inlet cavity, and the other end of the second channel segment is connected to the second channel segment. The inner diameter of the first channel segment is smaller than the inner diameter of the second channel segment, the inner diameter of the first channel segment is larger than the outer diameter of the inner tube, and the inner diameter of the inlet cavity near the first channel segment is smaller than the inner diameter of the first channel segment. The inner diameter of the second channel segment is the same as the inner diameter of the outer tube.

[0020] Optionally, the auxiliary Luer connector of the Y-type Luer seat is connected to the first channel segment.

[0021] Optionally, a stress diffusion tube is provided at one end of the outer tube near the Y-shaped Luer seat.

[0022] One of the above technical solutions has at least the following advantages or beneficial effects:

[0023] This invention provides a detachable balloon microcatheter that combines the functions of both balloon catheters and detachable catheters. This is achieved by detachably connecting the first end of the inner tube to the end cap, connecting the first end of the balloon to the end of the outer tube near the end cap, and connecting the second end of the balloon to the outer wall of the inner tube. Specifically, it provides multiple functions including vasodilation, temporary occlusion of blood flow, and injection of liquid embolic agents or gels into malformed vessels. Compared to balloon catheters and detachable catheters currently on the market, the detachable balloon microcatheter provided by this invention has a wider range of applications, particularly for embolization of complex malformed vessels, occlusion of tumor-bearing arteries, and embolization of highly vascularized brain tumors. Attached Figure Description

[0024] Figure 1 A schematic diagram of the structure of a detachable balloon microcatheter according to an embodiment of the present invention is shown;

[0025] Figure 2 A schematic diagram of the structure of a Y-type Luer seat according to another embodiment of the present invention is shown;

[0026] Figure 3 A partial structural schematic diagram of a detachable balloon microcatheter according to an embodiment of the present invention is shown.

[0027] [Explanation of Labels in the Attached Image]

[0028] 1. End tube head, 2. Inner tube, 3. Outer tube, 4. Balloon, 5. TPU tubing, 6. First radiopaque ring, 7. Second radiopaque ring, 8. Third radiopaque ring, 9. Y-type Luer connector, 901. Main Luer connector, 902. Inlet cavity, 903. Channel cavity, 904. Auxiliary Luer connector, 905. Stress diffusion tube, 906. Insertion tube, 907. Filling cavity, 9031. First channel section, 9032. Second channel section. Detailed Implementation

[0029] To better explain and facilitate understanding of this utility model, the present utility model will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0030] The following describes some embodiments of the detachable balloon microcatheter provided according to the present invention with reference to the accompanying drawings.

[0031] See Figures 1 to 3This utility model provides an embodiment of a detachable balloon microcatheter, which includes an end tube 1, an inner tube 2, an outer tube 3, and a balloon 4. The inner tube 2 is coaxially arranged with the end tube 1, and the first end of the inner tube 2 can be detached from the end tube 1. The outer tube 3 is coaxially arranged with the inner tube 2 and is sleeved on the inner tube 2. A cavity is formed between the inner wall of the outer tube 3 and the outer wall of the inner tube 2. The balloon 4 is connected to the cavity. The first end of the balloon 4 is connected to the end of the outer tube 3 near the end tube 1, and the second end of the balloon 4 is connected to the outer wall of the inner tube 2.

[0032] Here, the inner tube 2 is used for guidewire entry and exit and injection of liquid embolizing agent or glue; the detachable connection of the end tube 1 on the inner tube 2 allows the liquid embolizing agent or glue in the inner tube 2 to enter the malformed blood vessel and diffuse after passing through the end tube 1, and the end tube 1 can be detached from the inner tube 2 after embolization is completed.

[0033] Since the first end of the balloon 4 is connected to the end of the outer tube 3 near the end tube head 1, and the second end of the balloon 4 is connected to the outer wall of the inner tube 2, a cavity is formed between the balloon 4, the inner wall of the outer tube 3, and the outer wall of the inner tube 2, allowing liquid to enter the balloon 4 from the cavity formed between the inner wall of the outer tube 3 and the outer wall of the inner tube 2, so that the balloon 4 can temporarily block and dilate blood vessels.

[0034] In this embodiment, by detachably connecting the first end of the inner tube 2 to the end tube head 1, and connecting the first end of the balloon 4 to the end of the outer tube 3 near the end tube head 1, and connecting the second end of the balloon 4 to the outer wall of the inner tube 2, this detachable balloon microcatheter combines the functions of both balloon 4 catheters and detachable catheters, namely, it has multiple functions such as dilating blood vessels, temporarily blocking blood flow, and injecting liquid embolic agents or gels into malformed blood vessels. Compared with balloon 4 catheters and detachable catheters currently on the market, the detachable balloon microcatheter provided in this application has a wider range of applications, especially for embolization of complex malformed blood vessels, occlusion of tumor-bearing arteries, and embolization of highly vascularized brain tumors.

[0035] In some possible implementations, see [link to relevant documentation]. Figure 1 and Figure 3 The first end of the inner tube 2 is detachably connected to the end tube head 1 via a detachable component. The detachable component includes a TPU hose 5, which is fitted onto the inner tube 2 and the end tube head 1 and is interference-fitted with both the inner tube 2 and the end tube head 1.

[0036] Here, by cutting the TPU hose 5 at the inner tube 2 and the end tube head 1 with scissors, the end tube head 1 can be detached from the inner tube 2.

[0037] Furthermore, the outer diameter of the end tube 1 is slightly smaller than the outer diameter of the inner tube 2; after the TPU hose 5 is connected to the inner tube 2 and the end tube 1 by interference fit, the first end of the inner tube 2 contacts the end of the end tube 1.

[0038] The outer diameter of the end tube 1 is less than the outer diameter of the inner tube 2 by 0.01 mm.

[0039] Here, the outer diameter of the end tube 1 is slightly smaller than the outer diameter of the inner tube 2, which makes it easier to determine the contact position between the first end of the inner tube 2 and the end of the end tube 1 through the outer wall of the TPU hose 5, so that the TPU hose 5 can be cut at the contact position between the inner tube 2 and the end tube 1 with scissors.

[0040] In some possible embodiments, a first radiopaque ring 6 is fitted at the end of the inner tube 2 near the end tube head 1; a second radiopaque ring 7 is fitted at the end of the end tube head 1 away from the inner tube 2; and a third radiopaque ring 8 is fitted at each of the corresponding positions of the inner tube 2 and the balloon 4.

[0041] Here, the first contrast ring 6 is used to mark the position of the inner tube 2 near the end tube head 1, so as to help the doctor determine the position where the TPU tube 5 is cut; the second contrast ring 7 is used to mark the position on the end tube head 1; and the third contrast ring 8 is used to mark the position of the balloon 4.

[0042] In some possible embodiments, the balloon 4 is a cylindrical balloon.

[0043] It should be noted that the balloon 4 is made of polyurethane raw materials to ensure the elasticity and adaptability of the balloon 4.

[0044] Here, after the cylindrical balloon is inflated, it can temporarily block the dilated blood vessels.

[0045] In some possible implementations, see [link to relevant documentation]. Figure 1 and Figure 2 The detachable balloon microcatheter also includes a Y-shaped Luer seat 9, which is connected to the end of the outer tube 3 away from the end tube head 1; the second end of the inner tube 2 extends into the interior of the Y-shaped Luer seat 9 and communicates with the inlet cavity 902 on the main Luer connector 901 of the Y-shaped Luer seat 9.

[0046] Here, the main Luer connector 901 of the Y-type Luer seat 9 is provided with an inlet cavity 902. The axis of the inlet cavity 902 is on the same axis as the axis of the inner tube 2. One end of the main Luer connector 901 is connected to one end of the inlet cavity 902 so that the inner tube 2 is connected to the main Luer connector 901 of the Y-type Luer seat 9. This allows the guide wire to enter the inner tube 2 after passing through the inlet cavity 902 on the main Luer connector 901. At the same time, liquid embolizing agent or glue can also be injected into the inner tube 2 through the inlet cavity 902 on the main Luer connector 901.

[0047] In some possible embodiments, the Y-shaped Luer seat 9 is also provided with a channel cavity 903 that communicates with the inlet cavity 902. The axis of the channel cavity 903, the axis of the inlet cavity 902, and the axis of the outer tube 3 are all located on the same straight line. The channel cavity 903 is connected to the outer tube 3, and the second end of the inner tube 2 can pass through the channel cavity 903 and communicate with the inlet cavity 902.

[0048] Here, by aligning the axis of the channel cavity 903, the axis of the inlet cavity 902, and the axis of the outer tube 3 on the same straight line, the guidewire can quickly enter the inner tube 2 after passing through the inlet cavity 902. At the same time, liquid embolic agent or adhesive can be quickly injected into the inner tube 2 through the inlet cavity 902 on the main Luer connector 901.

[0049] In some possible implementations, see [link to relevant documentation]. Figure 2 The channel cavity 903 includes a first channel segment 9031 and a second channel segment 9032 that are coaxially arranged and connected. One end of the first channel segment 9031 is connected to the inlet cavity 902, and the other end of the second channel segment 9032 is connected to the second channel segment 9032. The inner diameter of the first channel segment 9031 is smaller than the inner diameter of the second channel segment 9032, and the inner diameter of the first channel segment 9031 is larger than the outer diameter of the inner tube 2. The inner diameter of the inlet cavity 902 near the first channel segment 9031 is smaller than the inner diameter of the first channel segment 9031, and the inner diameter of the second channel segment 9032 is the same as the inner diameter of the outer tube 3.

[0050] It should be noted that the inner diameter of the end of the inlet cavity 902 near the first channel segment 9031 is smaller than the outer diameter of the inner tube 2.

[0051] Here, by making the inner diameter of the first channel segment 9031 smaller than the inner diameter of the second channel segment 9032, and by making the inner diameter of the first channel segment 9031 larger than the outer diameter of the inner tube 2, a cavity can be formed between the inner wall of the first channel segment 9031 and the outer wall of the inner tube 2, which communicates with the cavity between the inner wall of the second channel segment 9032 and the outer wall of the inner tube 2. This allows the cavity formed between the inner wall of the first channel segment 9031 and the outer wall of the inner tube 2 to communicate with the cavity formed between the inner wall of the outer tube 3 and the outer wall of the inner tube 2. At the same time, by making the inner diameter of the end of the inlet cavity 902 near the first channel segment 9031 smaller than the inner diameter of the first channel segment 9031, the inner tube 2 located in the first channel segment 9031 communicates with the inlet cavity 902, while the second end of the inner tube 2 is also fixed inside the first channel segment 9031.

[0052] In some possible embodiments, the auxiliary Luer connector 904 of the Y-type Luer seat 9 is connected to the first channel segment 9031.

[0053] Here, the auxiliary Luer connector 904 is provided with an inflation cavity 907. One end of the inflation cavity 907 is connected to the first channel section 9031 so that when the inner tube 2 is installed on the first channel section 9031, the inflation cavity 907 is connected to the cavity formed by the inner wall of the first channel section 9031 and the outer wall of the inner tube 2. This allows the liquid injected by the syringe connected to the other end of the inflation cavity 907 to pass through the cavity formed by the inner wall of the first channel section 9031 and the outer wall of the inner tube 2, and then through the cavity formed by the inner wall of the outer tube 3 and the outer wall of the inner tube 2 before entering the balloon 4, so that the balloon 4 is inflated.

[0054] In this embodiment, by connecting the auxiliary Luer connector 904 of the Y-shaped Luer seat 9 to the first channel section 9031, the pressure of the liquid injected by the syringe in the cavity between the first channel section 9031 and the inner tube 2 is greater than the pressure of the liquid in the cavity between the second channel section 9032 and the inner tube 2. This allows the liquid injected by the syringe to quickly enter the cavity between the inner wall of the outer tube 3 and the outer wall of the inner tube 2 after passing through the cavity between the inner wall of the first channel section 9031 and the outer wall of the inner tube 2, thereby achieving rapid inflation of the balloon 4.

[0055] In some possible embodiments, the outer tube 3 is provided with a stress diffusion tube 905 at one end near the Y-shaped Luer seat 9.

[0056] It should be noted that the Y-type Luer seat 9 is provided with a plug tube 906 at one end near the outer tube 3. The plug tube 906 can be inserted into the stress diffusion tube 905 to realize the connection between the Y-type Luer seat 9 and the outer tube 3.

[0057] Here, the outer diameter of the diffuser tube gradually decreases from the end near the Y-shaped Luer seat 9 to the end near the TPU hose 5.

[0058] In this embodiment, a stress diffusion tube 905 is provided at one end of the outer tube 3 near the Y-shaped Luer seat 9, which can reduce the stress concentration phenomenon at the end of the outer tube 3 near the Y-shaped Luer seat 9, thereby avoiding damage to the connection between the Y-shaped Luer seat 9 and the outer tube 3 due to excessive bending.

[0059] In the description of this utility model, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0060] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0061] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "beneath" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0062] In the description of this specification, the terms "one embodiment," "some embodiments," "embodiment," "exemplary embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0063] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make modifications, alterations, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A detachable balloon microcatheter, characterized by, include: End cap; An inner tube is coaxially arranged with the end tube head, and the first end of the inner tube can be detached from the end tube head; An outer tube is coaxially arranged with the inner tube and sleeved on the inner tube, and a cavity is formed between the inner wall of the outer tube and the outer wall of the inner tube. A balloon is connected to the cavity; the first end of the balloon is connected to the end of the outer tube near the end tube head, and the second end of the balloon is connected to the outer wall of the inner tube.

2. The detachable balloon microcatheter of claim 1, wherein, The first end of the inner tube is detachably connected to the end tube head via a detachable component, the detachable component comprising: TPU tubing is fitted over the inner tube and the end tube, and is interference-fitted to both the inner tube and the end tube.

3. The detachable balloon microcatheter of claim 2, wherein, The outer diameter of the end tube is slightly smaller than the outer diameter of the inner tube; after the TPU hose is connected to the inner tube and the end tube with an interference fit, the first end of the inner tube contacts the end of the end tube.

4. The detachable balloon microcatheter of claim 2, wherein, A first radiopaque ring is fitted at the end of the inner tube closest to the end tube head; a second radiopaque ring is fitted at the end of the end tube head away from the inner tube; and a third radiopaque ring is fitted at each of the corresponding positions of the inner tube and the balloon.

5. The detachable balloon microcatheter of claim 1, wherein, The balloon is a cylindrical balloon.

6. The detachable balloon microcatheter of any one of claims 1 to 5, wherein, It also includes a Y-shaped Luer seat, which is connected to the end of the outer tube away from the end tube head; the second end of the inner tube extends into the interior of the Y-shaped Luer seat and communicates with the inlet cavity on the main Luer connector of the Y-shaped Luer seat.

7. The detachable balloon microcatheter of claim 6, wherein, The Y-shaped Luer seat is also provided with a channel cavity that communicates with the inlet cavity. The axis of the channel cavity, the axis of the inlet cavity, and the axis of the outer tube are all located on the same straight line. The channel cavity is connected to the outer tube, and the second end of the inner tube can pass through the channel cavity and communicate with the inlet cavity.

8. The detachable balloon microcatheter of claim 7, wherein, The channel cavity includes a first channel segment and a second channel segment that are coaxially arranged and connected. One end of the first channel segment is connected to the inlet cavity, and the other end of the second channel segment is connected to the second channel segment. The inner diameter of the first channel segment is smaller than the inner diameter of the second channel segment, and the inner diameter of the first channel segment is larger than the outer diameter of the inner tube. The inner diameter of the inlet cavity near the first channel segment is smaller than the inner diameter of the first channel segment, and the inner diameter of the second channel segment is the same as the inner diameter of the outer tube.

9. The detachable balloon microcatheter of claim 8, wherein, The auxiliary Luer connector of the Y-shaped Luer seat is connected to the first channel segment.

10. The detachable balloon microcatheter of claim 6, wherein, A stress diffusion tube is provided at one end of the outer tube near the Y-shaped Luer seat.

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