Suction catheter assembly

Abstract

The utility model provides a suction catheter assembly, and relates to the technical field of medical instruments, the suction catheter assembly comprises a suction catheter, an interlayer is arranged at a far-end opening of the suction catheter, a sliding sleeve is arranged in the interlayer, the far end of the sliding sleeve is connected with a plurality of valves, the valves are arranged in the circumferential direction around the axis of the sliding sleeve, and the sliding sleeve is connected with the suction catheter. A pushing wire is arranged at the near end of the sliding sleeve, the near end of the pushing wire extends to the outer side of an opening in the near end of the suction catheter, when the pushing wire is pushed to the far end, the valve extends out of the far end of the interlayer, and the far ends of the valve gradually gather together. By adopting the retractable valve, when the suction catheter is pushed to a position where'windowsill effect 'is easy to occur, the suction catheter can be guided by the valve, so that the suction catheter is kept coaxial with the guide wire, and then the suction catheter can be prevented from being clamped by pushing the suction catheter; therefore, the problems that an existing suction catheter is prone to being clamped or poor in pushing performance and the like are solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of medical equipment, and in particular relates to a suction catheter component. Background Art

[0002] ADAPT technology (A Direct Aspiration first-Pass Technology, ADAPT) is an intravascular treatment method that uses direct aspiration as a thrombectomy technique. Since the efficiency of thrombus aspiration is proportional to the aspiration pressure applied to the catheter and the inner diameter of the catheter, one of the design directions of intracranial thrombus aspiration catheters is to increase the inner diameter of the catheter as much as possible while ensuring the passability of the catheter, which has led to the birth of large-caliber intracranial thrombus aspiration catheters.

[0003] When using the ADAPT technique for intracranial thrombus removal, the thrombus aspiration catheter often experiences a "window sill effect" in the internal carotid artery and ophthalmic artery segment, such as Figure 1 As shown, the "window sill effect" formed by the suction catheter at the internal carotid artery and the ophthalmic artery, in which the catheter tip is easily stuck at the opening of the ophthalmic artery.

[0004] The reason for the window sill effect is that the inner diameter of the suction catheter is too different from the outer diameter of the guide wire, so that the suction catheter cannot maintain coaxiality with the guide wire at the bends and bifurcations of the blood vessels. In clinical practice, seamless coaxial technology is often used to line the catheter with a smaller catheter to reduce the probability of the window sill effect. Figure 2 The seamless coaxial technique is shown to allow the aspiration catheter to pass smoothly through the ophthalmic artery segment. However, this solution will increase the equivalent wall thickness of the catheter, thereby reducing the elasticity and passing ability of the catheter.

[0005] Therefore, it is necessary to provide an improved technical solution to address the above-mentioned deficiencies in the prior art. Summary of the invention

[0006] The purpose of the utility model is to provide a suction catheter assembly, which can prevent the suction catheter from getting stuck at the blood vessel branches such as the ophthalmic artery opening due to the "window sill effect" during the pushing process, and does not affect the compliance and passing capacity of the suction catheter, so as to solve the problems of the existing suction catheter being easily stuck or having poor pushing performance.

[0007] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0008] A suction catheter assembly comprises a suction catheter, wherein a sandwich is provided at the distal opening of the suction catheter, a sliding sleeve is provided in the sandwich, a plurality of valves are connected to the distal end of the sliding sleeve, the valves are circumferentially arranged around the axis of the sliding sleeve, a push wire is provided at the proximal end of the sliding sleeve, the proximal end of the push wire extends to the outside of the proximal opening of the suction catheter, when the push wire is pushed toward the distal end, the valve extends from the distal end of the sandwich, and the distal ends of the valves gradually gather together.

[0009] Preferably, the tube wall of the suction catheter is provided with a first channel, and the first channel is used for allowing the push wire to pass through.

[0010] Preferably, the valve is pre-shaped, and when the valve extends from the distal end of the interlayer, the valve returns to the pre-shaped shape.

[0011] Preferably, the first channel is located inside the wall of the suction catheter.

[0012] Preferably, the first channel is located inside the tube wall of the suction catheter.

[0013] Preferably, the valve is made of memory alloy.

[0014] Preferably, when the valve is fully extended from the distal end of the interlayer, the end thereof forms a first opening, and the first opening is used for passing a guide wire.

[0015] Preferably, the valve surface is covered with a lubricating coating.

[0016] Preferably, a handle is provided at the proximal end of the suction catheter, and the proximal end of the push wire is connected to the handle.

[0017] Beneficial effects:

[0018] (1) The utility model provides an extendable valve at the distal opening of the suction catheter. By pre-shaping the valve, the extended valves are brought together to form a nearly conical guide structure at the distal opening of the suction catheter. When the valve is pushed to a position where the "window sill effect" is likely to occur, such as the opening of the ophthalmic artery, the valve is pushed out, and the valve can be used to guide the suction catheter, so that the suction catheter remains coaxial with the guide wire. The suction catheter can then be pushed to avoid being stuck.

[0019] (2) During aspiration, the valve can be retracted to the interlayer of the aspiration catheter to avoid blocking the distal opening of the aspiration catheter, thereby not affecting the subsequent thrombus aspiration operation;

[0020] (3) The valve surface is provided with a lubricating coating, which can reduce the friction when the valve is extended / retracted, thus preventing the valve from getting stuck or deforming. In addition, when the extended valve contacts the blood vessel wall, the lubricating coating can reduce friction, making it easier for the suction catheter to pass through the "window sill" area and avoiding damage to the blood vessel wall. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The drawings constituting part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments and descriptions of the present invention are used to explain the present invention and do not constitute an improper limitation on the present invention. Among them:

[0022] Figure 1 Schematic diagram of the "window sill effect" occurring in existing suction catheters.

[0023] Figure 2 This is a front structural diagram of a suction catheter assembly provided in an embodiment of the utility model.

[0024] Figure 3 This is a front view of the distal end of the suction catheter in the embodiment of the utility model, in which the sleeve and the valve are hidden.

[0025] Figure 4 It is a stereoscopic diagram of the sliding sleeve and the valve in the embodiment of the utility model.

[0026] Figure 5 A stereoscopic diagram of a suction catheter assembly provided in an embodiment of the utility model.

[0027] Figure 6 This is a front view of the proximal end of the suction catheter in Example 2 of the utility model.

[0028] In the figure: 100, suction catheter; 101, interlayer; 102, first channel; 103, handle; 200, sleeve; 201, valve; 202, push wire; 203, first opening. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of the present invention.

[0030] In the description of the present invention, it should be understood that descriptions involving orientation, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0031] In the description of the present utility model, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed" etc. are understood to exclude the number itself, and "above", "below", "within" etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0032] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more features.

[0033] In the description of the present utility model, it should be noted that, unless otherwise clearly stipulated and limited, the term "connection" should be understood in a broad sense. For example, it can be a fixed connection or a movable connection, a detachable connection or a non-detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or mutual communication; it can be a direct connection, or an indirect connection through an intermediate medium, and it can be internal connection between two elements, indirect connection, or an interactive relationship between two elements.

[0034] The present invention will be described in detail below in conjunction with the embodiments. It should be noted that the embodiments and features in the embodiments of the present invention can be combined with each other without conflict.

[0035] The utility model aims to solve the problem that the "window sill effect" is easy to occur during the pushing process of the current suction catheter 100, and provides a suction catheter 100 component, such as Figures 2 to 5 As shown, the suction catheter 100 assembly includes a suction catheter 100, a sandwich layer 101 is provided at the distal opening of the suction catheter 100, a sleeve 200 is provided in the sandwich layer 101, the sleeve 200 can move axially along the sandwich layer 101, a plurality of valves 201 are connected to the distal end of the sleeve 200, and the valves 201 are circumferentially arranged around the axis of the sleeve 200. When the sleeve 200 slides to the farthest end of the sandwich layer 101, the valves 201 are completely exposed from the sandwich layer 101 and gather together.

[0036] In order to realize the retraction and extension of the valve 201, a push wire 202 is provided at the proximal end of the sliding sleeve 200. The proximal end of the push wire 202 extends to the outer side of the proximal opening of the suction catheter 100. When the push wire 202 is pushed toward the distal end, the push wire 202 pushes the sliding sleeve 200 to move toward the distal end of the interlayer 101, so that the valve 201 extends out from the distal end of the interlayer 101. After the valve 201 extends out from the distal opening of the interlayer 101, it loses the constraint of the interlayer 101, thereby restoring its initial shape, so that the distal end of the valve 201 gradually gathers into a shape as shown in FIG. Figure 2 , Figure 4 Conical shape shown.

[0037] Through the above arrangement, when the suction catheter 100 is pushed to the bifurcation of the internal carotid artery and the ophthalmic artery where the "window sill effect" is likely to occur, the push wire 202 is pushed to make the valve 201 leave the interlayer 101, and form a conical head end at the distal end of the suction catheter 100, thereby preventing the edge of the tube wall of the suction catheter 100 from getting stuck on the "window sill" at the bifurcation of the blood vessels, so that the suction catheter 100 can pass smoothly. The above structure will not increase the equivalent tube wall of the suction catheter 100, and thus will not affect the compliance and bending performance of the suction catheter 100, solving the problem that the existing suction catheter 100 is easy to get stuck, and will not cause a decrease in pushing performance.

[0038] In addition, the valve 201 can keep the distal end of the suction catheter 100 as coaxial as possible with the guide wire, and can also avoid the problem of the "window sill effect".

[0039] In the preferred embodiment of the present invention, the wall of the suction catheter 100 is provided with a first channel 102, and the first channel 102 is used for passing the push wire 202, and the push wire 202 extends along the first channel 102 to the proximal end of the suction catheter 100. In the preferred embodiment of the present invention, the first channel 102 is located inside the wall of the suction catheter 100.

[0040] In a preferred embodiment of the present invention, the first channel 102 is located inside the wall of the suction catheter 100 .

[0041] In a preferred embodiment of the utility model, the valve 201 is pre-shaped. When the valve 201 extends from the distal end of the interlayer 101, the valve 201 restores the pre-shaped shape. In order to enable the valve 201 to automatically restore its shape, the valve 201 can be made of a memory alloy, such as a nickel-titanium alloy, which is shaped into a petal shape and then connected to the distal end of the sleeve 200. When the valve 201 is received into the interlayer 101 along with the sleeve 200, the valve 201 is in a compressed state. After leaving the interlayer 101 and losing the external force, the valve 201 can automatically restore its petal shape and gather together.

[0042] In the preferred embodiment of the present invention, when the valve 201 is fully extended from the distal end of the interlayer 101, its end portion is configured as follows: Figure 4 ,5 The first opening 203 is shown, and the first opening 203 is used to allow a guide wire to pass through, so that the fully opened valve 201 will not be pressed against the surface of the guide wire passing through the inner cavity of the suction catheter 100 .

[0043] In a preferred embodiment of the present invention, the surface of the valve 201 is covered with a lubricating coating, such as a polytetrafluoroethylene coating, to reduce the friction between the valve 201 and the inner wall of the interlayer 101 , thereby reducing the force required to retract and extend the valve 201 .

[0044] Furthermore, a lubricating coating may be provided on the surface of the sleeve or the inner wall of the interlayer 101 to reduce the resistance when the push wire 202 pushes and pulls the sliding sleeve 200 .

[0045] In a preferred embodiment of the present invention, a handle 103 is provided at the proximal end of the suction catheter 100 , and the proximal end of the push wire 202 is connected to the handle 103 , and the retraction and extension of the push wire 202 is controlled by the handle 103 .

[0046] The following is a detailed description of a suction catheter 100 assembly of the present invention through a specific embodiment.

[0047] Example 1

[0048] This embodiment provides a suction catheter 100 assembly, such as Figure 2 , 3 As shown, it includes a suction catheter 100, a sandwich layer 101 is provided at the distal opening of the suction catheter 100, a sleeve 200 is provided in the sandwich layer 101, a plurality of valves 201 are connected to the distal end of the sleeve 200, and the valves 201 are circumferentially arranged around the axis of the sleeve 200, a push wire 202 is provided at the proximal end of the sleeve 200, and the proximal end of the push wire 202 extends to the outside of the proximal opening of the suction catheter 100. When the push wire 202 is pushed toward the distal end, the valve 201 extends from the distal end of the sandwich layer 101, and the distal end of the valve 201 gradually gathers.

[0049] A handle 103 is provided at the proximal end of the suction catheter 100, and a first channel 102 is provided inside the tube wall of the suction catheter 100. The proximal end of the push wire 202 extends along the first channel 102 to the outside of the proximal opening of the suction catheter 100 and is connected to the handle 103 so that the retraction and extension of the push wire 202 can be controlled by the handle 103.

[0050] In this embodiment, the valve 201 is made of nickel-titanium alloy and is pre-shaped so that it is in a curved petal shape when not squeezed by external force. When the valve 201 extends from the distal end of the interlayer 101, the valve 201 can restore the pre-shaped shape.

[0051] Before pushing the suction catheter 100, the push wire 202 is pulled by the handle 103 so that the valve 201 is stored in the interlayer 101, and then the suction catheter 100 is pushed along the guide wire. When it is determined from the image that the suction catheter 100 reaches a position such as a vascular bifurcation where the "window sill effect" is likely to occur, the push wire 202 is pushed to move the sleeve 200 toward the distal end of the interlayer 101 and release the valve 201, so that the valve 201 gathers into a cone shape at the distal opening of the suction catheter 100 to play a guiding role, and the suction catheter 100 and the guide wire are kept coaxial as much as possible to avoid the occurrence of the "window sill effect".

[0052] Example 2

[0053] This embodiment provides a suction catheter 100 assembly, which is improved on the basis of the embodiment 1. The difference from the embodiment 1 is that when the valve 201 is fully extended from the distal end of the interlayer 101, its end is configured as follows: Figure 4 , 5 The first opening 203 is shown for allowing a guide wire to pass through.

[0054] Through the above arrangement, the fully opened valve 201 will not be pressed against the surface of the guide wire passing through the inner cavity of the suction catheter 100, thereby preventing the friction between the two from hindering the suction catheter 100 from moving along the guide wire.

[0055] Example 3

[0056] This embodiment provides a suction catheter 100 assembly, which is improved on the basis of embodiment 1. The difference from embodiment 1 is that the surface of the valve 201 is covered with a lubricating coating, and the lubricating coating is made of polytetrafluoroethylene, which can reduce the friction resistance of the valve 201 during movement and reduce the scraping of the valve 201 on the blood vessel wall.

[0057] In summary:

[0058] The utility model provides a retractable valve. When the suction catheter is pushed to the bifurcation of the internal carotid artery and the ophthalmic artery where the "window sill effect" is likely to occur, the push wire is pushed to make the valve leave the interlayer, and a conical head is formed at the distal end of the suction catheter, thereby preventing the edge of the suction catheter wall from getting stuck on the "window sill" at the bifurcation of the blood vessels, so that the suction catheter can pass smoothly. The above structure will not increase the equivalent tube wall of the suction catheter, and thus will not affect the compliance and bending performance of the suction catheter, solving the problem that the existing suction catheter is easy to get stuck, and will not cause a decrease in pushing performance.

[0059] The above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. For those skilled in the art, the utility model may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A suction catheter assembly, comprising a suction catheter, characterized in that: A sandwich layer is provided at the distal opening of the suction catheter, a sliding sleeve is provided in the sandwich layer, a plurality of valves are connected to the distal end of the sliding sleeve, the valves are circumferentially arranged around the axis of the sliding sleeve, a pushing wire is provided at the proximal end of the sliding sleeve, the proximal end of the pushing wire extends to the outside of the proximal opening of the suction catheter, when the pushing wire is pushed toward the distal end, the valve extends from the distal end of the sandwich layer, and the distal end of the valve gradually gathers.

2. A suction catheter assembly according to claim 1, characterized in that: The tube wall of the suction catheter is provided with a first channel, and the first channel is used for the push wire to pass through.

3. The suction catheter assembly according to claim 1, characterized in that: The valve is pre-shaped, and when the valve extends out from the distal end of the interlayer, the valve restores the pre-shaped shape.

4. The suction catheter assembly according to claim 2, characterized in that: The first channel is located inside the tube wall of the suction catheter.

5. The suction catheter assembly according to claim 2, characterized in that: The first channel is located inside the tube wall of the suction catheter.

6. A suction catheter assembly according to claim 1 or 3, characterized in that: The valve is made of memory alloy.

7. A suction catheter assembly according to claim 1 or 3, characterized in that: When the valve is fully extended from the distal end of the interlayer, the end of the valve forms a first opening, and the first opening is used for passing a guide wire.

8. The suction catheter assembly according to any one of claims 1 to 5, characterized in that: The proximal end of the suction catheter is provided with a handle, and the proximal end of the push wire is connected to the handle.

9. The suction catheter assembly according to any one of claims 1 to 5, characterized in that: The valve surface is covered with a lubricating coating.

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