Intracranial balloon suction catheter

Abstract

The utility model provides an intracranial balloon suction catheter, and belongs to the technical field of medical instrument intervention equipment. The catheter comprises a catheter body used for sucking a bolt block, a tubular elastic supporting element is arranged at the far end of the catheter body, the elastic supporting element can be supported in the radial direction and can contract in the axial direction, the outer side of the elastic supporting element is wrapped with a balloon, the near end of the balloon is arranged at the far end of the catheter body, and the far end of the balloon is fixedly connected with the far end of the elastic supporting element. The suction nozzle is used for forming a suction port so as to directly extract the plug block; the suction catheter is used for solving the technical problems that an existing suction catheter is large in radial size of the far end and poor in compliance, so that the in-place performance is poor, and the treatment effect is poor.

Description

Technical Field

[0001] The utility model belongs to the technical field of medical device interventional devices, and particularly relates to an intracranial balloon aspiration catheter. Background Art

[0002] As Figure 1 shown, a balloon 2 is arranged outside the tube body 1 of the existing intracranial balloon aspiration catheter near the distal end. The balloon 2 is filled through a lumen 3 on the side wall of the tube body 1. When aspirating a thrombus 4, the balloon 2 needs to be filled and pressed against the inner wall of the blood vessel 5 to temporarily stop the blood flow in the blood vessel 5 at the aspiration position, so as to ensure the aspiration effect on the thrombus 4.

[0003] Due to insufficient compliance at the distal end of the existing aspiration catheter, the catheterization performance of the aspiration catheter is poor and it cannot reach a farther position. In addition, the existing balloon is generally arranged on the outer wall of the aspiration catheter, which further increases the outer wall size of the aspiration catheter and further reduces the compliance of the aspiration catheter. Therefore, the existing aspiration catheter has a poor treatment effect on thrombi at farther positions.

[0004] In addition, when aspirating a thrombus, the thrombus hitting the distal end of the aspiration catheter is likely to break off small thrombus particles. The small thrombus particles are easily accumulated behind the aspiration port of the aspiration catheter and are thus not easily discharged from the body by the aspiration catheter. After the aspiration operation is completed, the small thrombus particles are easily carried by the blood flow to blood vessels at farther distal positions, further affecting the physical health of the patient.

[0005] Therefore, an improved technical solution is needed to address the above deficiencies in the existing technology. Summary of the Utility Model

[0006] The purpose of the utility model is to provide an intracranial balloon aspiration catheter to solve the technical problems of poor catheterization performance and poor treatment effect caused by the large radial size and insufficient compliance at the distal end of the existing aspiration catheter.

[0007] To achieve the above purpose, the intracranial balloon aspiration catheter of the utility model provides the following technical solution:

[0008] An intracranial balloon aspiration catheter includes a tube body for aspirating a thrombus. A tubular elastic support element is arranged at the distal end of the tube body. The elastic support element can support radially and can contract axially. A balloon is coated outside the elastic support element. The proximal end of the balloon is arranged at the distal end of the tube body, and the distal end of the balloon is fixedly connected to the distal end of the elastic support element to form an aspiration port for directly aspirating a thrombus.

[0009] As a further optimized technical solution, a cord-like pulling member is provided at the distal end of the elastic support element. The distal end of the cord-like pulling member is fixedly connected to the distal end of the elastic support element, and the proximal end of the cord-like pulling member extends out of the proximal end of the tube body along the tube body. Pulling the cord-like pulling member can contract the elastic support element.

[0010] As a further optimized technical solution, the balloon has an inner film and an outer film. The inner film is attached to the outer side wall of the elastic support element so that the inner cavity of the elastic support element is hermetically and fixedly communicated with the distal end of the tube body. The outer film is sleeved outside the inner film to form a sealed cavity with the inner film. The cavity is fixedly communicated with the lumen on the side wall of the tube body for increasing or decreasing the volume of the balloon.

[0011] As a further optimized technical solution, a connecting valve body is provided at the proximal end of the tube body, and the tube body is connected to an operating device at the proximal end through the connecting valve body.

[0012] As a further optimized technical solution, the connecting valve body includes a main valve body. The main valve body is arranged on the extension line of the tube body. The distal end of the main valve body is fixedly communicated with the proximal end of the tube body, and the proximal end of the main valve body is used for connecting a suction device.

[0013] As a further optimized technical solution, a first branch connecting valve and a second branch connecting valve are provided on the main valve body. The first branch connecting valve is used for communicating the lumen on the tube body to change the volume of the balloon; the second branch connecting valve is used for communicating the tube body, and the cord-like pulling member extends out of the tube body through the second branch connecting valve for operating the cord-like pulling member.

[0014] As a further optimized technical solution, the elastic support element is a helical spring.

[0015] As a further optimized technical solution, the elastic support element includes a cylinder body. Axially spaced perforations are provided on the cylinder body, and the projection of the perforations in the radial direction of the cylinder body is substantially triangular.

[0016] As a further optimized technical solution, a radiopaque point is provided at the distal end of the elastic support element.

[0017] As a further optimized technical solution, the diameter of the elastic support element gradually decreases from the proximal end to the distal end.

[0018] Beneficial effects: By providing a tubular elastic support element at the distal end of the tube body, the present utility model effectively increases the flexibility of the distal end of the tube body, improves the positioning performance of the tube body, and enables the aspiration of thrombus masses further distal in the blood vessel, thereby enhancing the treatment effect of the intracranial balloon aspiration catheter. Among them, by directly covering the balloon on the elastic support element, compared with the prior art of covering the balloon on the tube body, the restriction of the balloon on the tube body is reduced. Thus, while increasing the flexibility of the tube body, the diameter of the tube body is also reduced, further enhancing the positioning performance of the distal end of the tube body. In addition, the balloon is arranged at the distal end of the tube body. When aspirating the thrombus mass, the balloon inflates and expands, making the distal end of the tube body a flexible structure. Even if the thrombus mass impacts the aspiration port at the distal end of the tube body under the action of the suction force, the probability of it being broken into small thrombus masses is reduced, further improving the safety of the operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings forming a part of this application are used to provide a further understanding of the present utility model. The schematic embodiments of the present utility model and their descriptions are used to explain the present utility model and do not constitute an improper limitation to the present utility model. Among them:

[0020] Figure 1 is a schematic structural diagram of the tube body of the prior art;

[0021] Figure 2 is a schematic overall structural diagram of an embodiment of the present utility model;

[0022] Figure 3 is a schematic structural diagram of the distal end of the tube body of an embodiment of the present utility model;

[0023] Figure 4 is a schematic diagram of the working state of the tube body of an embodiment of the present utility model;

[0024] Figure 5 is a schematic structural diagram of the connection valve body of an embodiment of the present utility model;

[0025] Figure 6 is a schematic structural diagram of the elastic support element of another embodiment of the present utility model.

[0026] In the figures: 1. Tube body; 11. Aspiration channel; 2. Balloon; 201. Inner film; 202. Outer film; 203. Cavity; 3. Tube lumen; 4. Thrombus mass; 5. Blood vessel; 6. Elastic support element; 601. Cylinder; 602. Perforation; 7. Rope-like traction member; 8. Connection valve body; 801. Main valve body; 802. First branch connection valve; 803. Second branch connection valve. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] The technical solutions in the embodiments of the present utility model will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art shall fall within the protection scope of the present utility model.

[0028] In the description of the present utility model, the orientation or positional relationship indicated by the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and does not require the present utility model to be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model. The terms "connected" and "connected" used in the present utility model should be understood in a broad sense. For example, it can be a fixed connection or a detachable connection; it can be directly connected or indirectly connected through an intermediate component. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0029] The present utility model will be described in detail below with reference to the drawings and in conjunction with embodiments. It should be noted that, without conflict, the embodiments in the present utility model and the features in the embodiments can be combined with each other.

[0030] The present utility model provides an intracranial balloon aspiration catheter. By arranging an elastic support element at the distal end of the tube body and directly arranging the balloon on the elastic support element, the influence of the balloon on the diameter and flexibility of the tube body is reduced, so that the flexibility of the tube body is increased and the diameter is reduced, improving the treatment effect.

[0031] Embodiment 1

[0032] As Figure 2 、 Figure 3 shown, the intracranial balloon aspiration catheter includes a tube body 1 for aspirating thrombus 4. The tube body 1 has an aspiration channel 11 for aspirating thrombus 4. The tube body 1 also has a lumen 3 for filling the balloon 2. A connection valve body 8 is installed at the proximal end of the tube body 1. The tube body 1 is connected to the proximal operation device through the connection valve body 8 to operate the intracranial balloon aspiration catheter for surgery.

[0033] As Figure 5 shown, the connection valve body 8 includes a main valve body 801. The main valve body 801 is installed on the extension line of the tube body 1. The distal end of the main valve body 801 is fixedly communicated with the proximal end of the tube body 1, and the inner cavity of the main valve body 801 is fixedly communicated with the aspiration channel 11. The proximal end of the main valve body 801 is used to connect the aspiration device in the operation device. The aspiration device provides suction force to the aspiration channel 11 of the tube body 1 through the main valve body 801.

[0034] The main valve body 801 is provided with a first branch connection valve 802 and a second branch connection valve 803. The inner cavity corresponding to the first branch connection valve 802 is used to communicate with the lumen 3 on the tube body 1 to change the volume of the balloon 2. The second branch connection valve 803 is used to directly communicate with the tube body 1.

[0035] A tubular elastic support element 6 is installed at the distal end of the tube body 1. The elastic support element 6 can support radially and can contract axially. In this embodiment, the elastic support element 6 is selected as a helical spring. The outer side of the elastic support element 6 is coated with a balloon 2. The proximal end of the balloon 2 is installed at the distal end of the tube body 1, and the distal end of the balloon 2 is fixedly connected to the distal end of the elastic support element 6. The balloon 2 has an inner film 201 and an outer film 202. The inner film 201 adheres to the outer side wall of the elastic support element 6 so that the inner cavity of the elastic support element 6 is hermetically and fixedly communicated with the distal end of the tube body 1. That is, the elastic support element 6 and the inner film 201 form a part of the suction channel 11, thereby forming a suction port at the distal end of the tube body 1 for directly extracting the thrombus 4. The outer film 202 is sleeved outside the inner film 201 to form a sealed cavity 203 with the inner film 201. The cavity 203 is fixedly communicated with the lumen 3 on the side wall of the tube body 1 for increasing or decreasing the volume of the balloon 2.

[0036] Specifically, during use, the distal end of the tube body 1 is inserted into the blood vessel 5 along the blood vessel to the position of the thrombus 4. First, the balloon 2 is filled so that the blood flow in the blood vessel 5 at the suction position is temporarily stopped. The suction device is started to suck the thrombus 4. After the suction is completed, the volume of the balloon 2 is scaled, and the tube body 1 is removed from the body.

[0037] In addition, in the above solution, since the width at both ends of the balloon 2 is smaller than the diameter in the middle after the balloon 2 is filled, there are still inevitably some gaps between the distal end of the balloon 2 and the blood vessel 5. Small thrombi 4 are likely to be stored in this gap, resulting in incomplete removal of the thrombi 4.

[0038] To solve the above technical problems, a cord-like pulling component 7 is provided at the distal end of the elastic support element 6. The distal end of the cord-like pulling component 7 is fixedly connected to the distal end of the elastic support element 6. The proximal end of the cord-like pulling component 7 extends along the tube body 1 out of the proximal end of the tube body 1 and extends out of the tube body 1 through the second branch connection valve 803. Pulling the cord-like pulling component 7 can axially contract the elastic support element 6.

[0039] In this way, during the operation, after the balloon 2 is filled, the cord-like pulling component 7 is further pulled to contract the elastic support element 6 component. This can further increase the support at the distal end of the tube body 1, and the distal end of the balloon 2 contracts inward, thus forming a "flare" shape, specifically as Figure 4As shown, this not only eliminates the gap between the distal end of the balloon 2 and the inner wall of the blood vessel 5 to the greatest extent, but also the distal end of the balloon 2 in the shape of a "flare" has a guiding function, ensuring that the thrombus 4 is sucked away by the suction port and improving the ability to remove the thrombus 4.

[0040] For the convenience of surgical operation, a radiopaque material can be coated on the distal end of the elastic support element 6 to form a radiopaque point.

[0041] To further increase the positionability of the tube body 1, the diameter of the elastic support element 6 can be gradually and uniformly reduced from the proximal end to the distal end to form a conical shape.

[0042] In other embodiments of the intracranial balloon aspiration catheter, as Figure 6 shown, the elastic support element 6 includes a cylinder body 601, and through holes 602 are axially spaced on the cylinder body 601. The projection of the through holes 602 in the radial direction of the cylinder body 601 is substantially triangular. It should be noted here that the edges of the through holes 602 can be straight lines or curves, so the projection of the through holes 602 in the radial direction of the cylinder body 601 is substantially triangular.

[0043] It can be understood that the above description is only exemplary, and the embodiments of the present application do not limit this.

[0044] The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention are within the scope of the claims of the present invention awaiting approval.

Claims

1. An intracranial balloon aspiration catheter, comprising a tube body (1) for aspirating an embolus (4), characterized in that: A tubular elastic support element (6) is arranged at the distal end of the tube body (1). The elastic support element (6) can provide radial support and can shrink axially. The outer side of the elastic support element (6) is coated with a balloon (2). The proximal end of the balloon (2) is arranged at the distal end of the tube body (1). The distal end of the balloon (2) is fixedly connected to the distal end of the elastic support element (6) to form a suction port for directly extracting the thrombus (4).

2. The intracranial balloon aspiration catheter according to claim 1, characterized in that: The distal end of the elastic support element (6) is provided with a rope-like pulling component (7), the distal end of the rope-like pulling component (7) is fixedly connected to the distal end of the elastic support element (6), and the proximal end of the rope-like pulling component (7) extends out of the proximal end of the tube body (1) along the tube body (1), and the elastic support element (6) can be contracted by pulling the rope-like pulling component (7).

3. The intracranial balloon aspiration catheter according to claim 2, characterized in that: The balloon (2) comprises an inner coating (201) and an outer coating (202); the inner coating (201) is attached to the outer wall of the elastic support element (6) so that the inner cavity of the elastic support element (6) is sealed and fixedly connected to the distal end of the tube body (1); the outer coating (202) is sleeved on the outer side of the inner coating (201) and forms a sealed cavity (203) with the inner coating (201); the cavity (203) is fixedly connected to the lumen (3) on the side wall of the tube body (1) and is used to increase or decrease the volume of the balloon (2).

4. The intracranial balloon aspiration catheter according to claim 3, characterized in that: A connecting valve body (8) is provided at the proximal end of the tube body (1), and the tube body (1) is connected to an operating device at the proximal end via the connecting valve body (8).

5. The intracranial balloon aspiration catheter according to claim 4, characterized in that: The connecting valve body (8) comprises a main valve body (801), which is arranged on the extension line of the tube body (1), the distal end of the main valve body (801) is fixedly connected to the proximal end of the tube body (1), and the proximal end of the main valve body (801) is used to connect to the suction device.

6. The intracranial balloon aspiration catheter according to claim 5, characterized in that: The main valve body (801) is provided with a first branch connecting valve (802) and a second branch connecting valve (803); the first branch connecting valve (802) is used to connect with the lumen (3) on the tube body (1) to change the volume of the balloon (2); the second branch connecting valve (803) is used to connect with the tube body (1); the rope-like pulling component (7) extends out of the tube body (1) through the second branch connecting valve (803) and is used to operate the rope-like pulling component (7).

7. The intracranial balloon aspiration catheter according to any one of claims 1 to 6, characterized in that: The elastic supporting element (6) is a coil spring.

8. The intracranial balloon aspiration catheter according to any one of claims 1 to 6, characterized in that: The elastic support element (6) comprises a cylinder (601), on which perforations (602) are axially spaced apart, and the projection of the perforations (602) along the radial direction of the cylinder (601) is roughly triangular.

9. The intracranial balloon aspiration catheter according to any one of claims 1 to 6, characterized in that: A developing point is arranged at the distal end of the elastic supporting element (6).

10. The intracranial balloon aspiration catheter according to any one of claims 1 to 6, characterized in that: The diameter of the elastic support element (6) gradually decreases from the proximal end to the distal end.

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