Thrombus aspiration catheter assembly

Abstract

The utility model provides a thrombus aspiration catheter assembly, and belongs to the technical field of intervention equipment. The assembly comprises a catheter and a guide wire, the guide wire is arranged in the catheter in a penetrating mode and used for guiding the catheter to a set position, an extension section is arranged at the far end of the catheter, the extension section is provided with an inner cavity extending in the axial direction and used for allowing the guide wire to penetrate through, the outer diameter of the extension section is matched with the inner diameter of the catheter, and the diameter of the inner cavity of the extension section is not smaller than the outer diameter of the guide wire; a pushing structure is arranged at the near end of the extension section and is used for pushing the extension section to slide in the catheter so as to extend out of the far end of the catheter or withdraw from the catheter; the technical problem that in the prior art, a windowsill effect exists when a guide wire is matched with a catheter is solved.

Description

Technical Field

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

[0002] With the rapid advancement of medical technology in recent years, treatment options for patients with vascular occlusion have also evolved. Numerous well-designed clinical trials have fully demonstrated the superior efficacy of mechanical thrombectomy using stent retrievers in treating this condition, making it the gold standard treatment option in this field. Recently published data have revealed an alternative treatment option: direct thrombus aspiration using a large-bore catheter. This approach not only demonstrates its compatibility with vascular occlusion treatment but also, through comparative clinical data, demonstrates its potential as a viable alternative to stent retriever-based approaches. Direct thrombus aspiration using a large-bore catheter is gaining attention in the medical community due to its unique advantages, including more direct and rapid clot removal and relatively low operational difficulty. Compared to traditional stent retriever-based approaches, this new technology offers patients a more comfortable and efficient treatment experience.

[0003] However, there are some problems with large-caliber suction catheters, such as Figure 1 As shown in the figure, when navigating a large-bore suction catheter through a complex vascular structure, the interaction between the guidewire and the catheter leads to the so-called "window sill effect." This phenomenon manifests itself when the guidewire attempts to guide the catheter through a bifurcation or bend in the vessel. Due to the large difference in diameter between the guidewire and the catheter, the guidewire is often eccentric relative to the catheter. This condition causes the catheter to become unstable or stuck under the guidance of the guidewire. In other words, the ideal position of the catheter tip deviates from the actual position, resulting in a jam at the actual contact point between the catheter and the guidewire, thus affecting the smooth progress of the procedure.

[0004] Therefore, it is necessary to provide an improved technical solution to the above-mentioned deficiencies in the prior art. Utility Model Content

[0005] The purpose of the utility model is to provide a thrombus aspiration catheter, so as to at least solve the technical problem of "window sill effect" existing in the prior art when a guide wire and a catheter cooperate.

[0006] In order to achieve the above objectives, the thrombus aspiration catheter of the present invention provides the following technical solutions:

[0007] A thrombus aspiration catheter assembly includes a catheter and a guidewire. The guidewire is inserted into the catheter to guide the catheter to a set position. The distal end of the catheter is provided with an extension section. The extension section has an axially extending inner cavity for allowing the guidewire to pass through. The outer diameter of the extension section is adapted to the inner diameter of the catheter, and the diameter of the inner cavity of the extension section is not less than the outer diameter of the guidewire. The proximal end of the extension section is provided with a pushing structure for pushing the extension section to slide in the catheter to extend the distal end of the catheter or withdraw the catheter.

[0008] As a further optimized technical solution, a limiting structure is provided between the extension section and the catheter to limit the maximum length of the extension section extending out of the distal end of the catheter, so as to ensure continuous cooperation between the extension section and the catheter.

[0009] As a further optimized technical solution, the diameter of the inner cavity of the extension section is adapted to the outer diameter of the guide wire.

[0010] As a further optimized technical solution, a guide structure is provided between the extension section and the catheter to ensure that the extension section slides axially in the catheter.

[0011] As a further optimized technical solution, the guide structure includes an axially extending guide groove and a sliding protrusion, the cross-section of the sliding protrusion is adapted to the cross-section of the guide groove, the guide groove is arranged on one of the components of the conduit and the extension section, and the sliding protrusion is arranged on the other component.

[0012] As a further optimized technical solution, the guide groove is arranged on the inner side wall of the catheter, and the corresponding sliding protrusion is arranged on the outer side wall of the extension section.

[0013] As a further optimized technical solution, the cross section of the guide groove is rectangular.

[0014] As a further optimized technical solution, the limiting structure includes a buckle and a locking hole. The buckle has an elastic and retractable block that can be locked in the locking hole. The block is engaged in the locking hole to achieve the locking of the limiting structure. The buckle is set on one of the components in the catheter and the extension section, and the locking hole is set on the other component.

[0015] As a further optimized technical solution, the buckle is arranged on the inner side wall of the catheter, and the corresponding locking hole is arranged on the extension section.

[0016] As a further optimized technical solution, the buckle is arranged in the guide groove of the catheter, and the locking hole is arranged on the sliding protrusion of the extension section.

[0017] As a further optimized technical solution, the extension section has an axially extending inner cavity, so that the extension section is a tubular structure.

[0018] Beneficial effects: By arranging an extension section at the distal end of the catheter, the extension section has an axially extending inner cavity for the guide wire to pass through, the outer diameter of the extension section is adapted to the inner diameter of the catheter, and the diameter of the inner cavity of the extension section is not less than the outer diameter of the guide wire. In this way, when the surgical operation is performed, the guide wire passes through the extension section and out of the catheter, thereby effectively improving the degree of eccentricity between the guide wire and the extension section. In this way, when the guide wire attempts to guide the catheter through the bifurcation or bend of the blood vessel, the degree to which the extension section deviates from the ideal position is effectively reduced, thereby improving the "windowsill effect"; especially when the diameter of the inner cavity of the extension section is adapted to the outer diameter of the guide wire, at this time, the catheter is in the ideal position, the improvement effect is the best, and the operation can be carried out smoothly. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings constituting part of this application are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an improper limitation of the present invention.

[0020] Figure 1 This is a schematic diagram of the cooperation between the guide wire and the catheter in the prior art;

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

[0022] Figure 3 This is a schematic diagram of the cooperation between the catheter and the extension section according to one embodiment of the present invention;

[0023] Figure 4 A schematic cross-sectional view of a catheter and an extension section in cooperation with each other according to an embodiment of the present invention;

[0024] Figure 5 This is a schematic diagram of the locking state of the limiting structure of an embodiment of the present utility model.

[0025] In the figure: 1. catheter; 2. pushing structure; 3. extension section; 301. inner cavity; 4. limiting structure; 401. buckle; 402. locking hole; 403. block; 5. guide structure; 501. guide groove; 502. sliding protrusion. DETAILED DESCRIPTION

[0026] The following is a clear and complete description of the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field are within the scope of protection of the present invention.

[0027] In the description of the present invention, the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and do not require that the present invention must be constructed and operated in a specific direction. Therefore, they should not be understood as limitations on the present invention. The terms "connected" and "connected" used in the present invention should be understood in a broad sense. For example, they can be fixed connections or detachable connections; they can be directly connected or indirectly connected through intermediate components. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0028] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments. It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present invention can be combined with each other.

[0029] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments. It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present invention can be combined with each other.

[0030] The utility model provides a thrombus aspiration catheter assembly, which provides an extension section at the distal end of the guide wire. The diameter of the extension section is larger than the outer diameter of the guide wire and not larger than the inner diameter of the catheter. The guide wire uses the distal extension section to guide the catheter, thereby effectively improving the "window sill effect".

[0031] Example 1

[0032] like Figure 2 As shown, the thrombus aspiration catheter assembly includes a catheter 1 and a guidewire (not shown in the figure). The guidewire is inserted into the catheter 1 to guide the catheter 1 to a set position. The distal end of the catheter 1 is fixedly connected to an extension section 3. The extension section 3 has an axially extending inner lumen 301, so that the extension section 3 has a tubular structure for passing the guidewire. In addition, the bending performance of the extension section 3 is guaranteed. The outer diameter of the extension section 3 is adapted to the inner diameter of the catheter 1, and the diameter of the inner lumen 301 of the extension section 3 is not less than the outer diameter of the guidewire. In this way, when the guidewire guides the catheter 1, the catheter 1 is ultimately guided by directly guiding the extension section 3 with a reduced diameter, thereby reducing the occurrence of the "window sill effect". A pushing structure 2 is provided at the proximal end of the extension section 3, which is used to push the extension section 3 to slide in the catheter 1 to extend the distal end of the catheter 1 or withdraw the catheter 1. In this embodiment, the pushing structure 2 is a pushing wire, the distal end of the pushing wire is fixedly connected to the proximal end of the extension section 3, and the proximal end extends out of the proximal end of the catheter 1. The extension section 3 is operated to slide in the catheter 1 by pushing and pulling the pushing wire at the proximal end of the catheter 1.

[0033] A limit structure 4 is provided between extension section 3 and catheter 1 to limit the maximum length that extension section 3 can extend beyond the distal end of catheter 1. This ensures continuous engagement between extension section 3 and catheter 1, preventing extension section 3 from completely extending beyond catheter 1. If extension section 3 bends and extends beyond catheter 1, the guidewire-catheter engagement relationship will remain the same as in the prior art, failing to resolve the technical issue. With the help of limit structure 4, extension section 3 can be limited to its maximum length beyond the distal end of catheter 1. The guidewire then simultaneously passes through catheter 1 and extension section 3, guiding extension section 3 and, consequently, advancing catheter 1 within the blood vessel.

[0034] Specifically, in this embodiment, the diameter of the inner lumen 301 of the extension section 3 matches the outer diameter of the guidewire. That is, the diameter of the inner lumen 301 of the extension section 3 is equal to the diameter of the guidewire. In this case, there is no eccentricity between the guidewire and the extension section 3. When the guidewire attempts to guide the catheter 1 through a bifurcation or bend in a blood vessel, the catheter 1 is in an ideal position, and the "window sill effect" is almost non-existent. In other embodiments, the diameter of the inner lumen 301 of the extension section 3 can be slightly larger than the outer diameter of the guidewire. In this case, although the "window sill effect" still exists, it is significantly improved compared to the existing technology.

[0035] Furthermore, in this embodiment, the main tube of catheter 1 is made of stainless steel or nickel-titanium alloy, providing sufficient strength and rigidity to withstand the pressure generated during aspiration. The extension section 3 is made of polyurethane or silicone, providing greater flexibility to adapt to bifurcations and bends in blood vessels and reduce friction with catheter 1.

[0036] like Figure 3 、 Figure 4 As shown, a guide structure 5 is provided between the extension section 3 and the catheter 1 to ensure that the extension section 3 slides smoothly axially in the catheter 1 .

[0037] In this embodiment, the guide structure 5 includes an axially extending guide groove 501 and a sliding protrusion 502. The cross-section of the sliding protrusion 502 matches the cross-section of the guide groove 501. The guide groove 501 is provided on the inner sidewall of the catheter 1, while the corresponding sliding protrusion 502 is provided on the outer sidewall of the extension section 3. This allows the size of the suction lumen of the catheter 1 to be further increased after the guidewire is removed from the catheter 1 along with the extension section 3 after the guidewire is removed from the catheter 1. This further enhances the suction effect.

[0038] In other embodiments, the guide groove 501 may also be provided on the outer side wall of the extension section 3 . In this case, the corresponding sliding protrusion 502 is provided on the inner side wall of the conduit 1 .

[0039] Furthermore, the cross section of the guide groove 501 is rectangular, which facilitates processing and assembly. In other embodiments, the cross section of the guide groove 501 can be dovetail-shaped, arc-shaped, or other reasonable shapes.

[0040] like Figure 5 As shown, the limiting structure 4 includes a buckle 401 and a locking hole 402. The buckle 401 has an elastically retractable block 403 that can be locked in the locking hole 402. The block 403 is removably engaged with the locking hole 402 to lock the limiting structure 4. The end of the block 403 is an arc-shaped surface, which facilitates disengagement from the locking hole 402 and facilitates the withdrawal of the extension section 3.

[0041] In this embodiment, the buckle 401 is provided on the inner side wall of the conduit 1, and the corresponding locking hole 402 is provided on the extension section 3. This can reduce the wear of the buckle 401 on the inner side wall of the conduit 1.

[0042] In other embodiments, the buckle 401 may be provided on the extension section 3 , and the corresponding locking hole 402 may be provided on the inner side wall of the catheter 1 .

[0043] Furthermore, the buckle 401 is positioned within the guide groove 501 of the catheter 1, and the locking hole 402 is positioned on the sliding protrusion 502 of the extension section 3. This arrangement aims to, on the one hand, reduce the risk of loosening or disconnection due to external forces when the buckle 401 and the locking hole 402 are positioned within the guide groove 501 of the catheter 1 and on the sliding protrusion 502 of the extension section 3, thereby improving the overall stability of the suction catheter. On the other hand, when the buckle 401 and the locking hole 402 are positioned within the guide groove 501 of the catheter 1 and on the sliding protrusion 502 of the extension section 3, respectively, the operator can more accurately position and secure the catheter 1 and the extension section 3. This helps reduce the risk of surgical failure due to improper operation and improves the success rate of the procedure.

[0044] Specifically, when in use, first push the proximal push wire to make the extension section 3 move axially toward the distal end of the catheter 1 and extend out of the distal end of the catheter 1, and continue to push the extension section 3 forward until the buckle 401 is engaged in the locking hole 402, then pass the guide wire through the catheter 1 and the extension section 3 and guide the catheter 1 forward to the location of the thrombus, then pull the push wire to withdraw the extension section 3 from the catheter 1, and then start the suction device at the proximal end of the catheter 1 to suck out the thrombus.

[0045] During use, since the outer diameter of the extension section 3 is equal to the inner diameter of the catheter 1, and the diameter of the inner cavity 301 of the extension section 3 is equal to the diameter of the guide wire, there is no eccentricity between the extension section 3 on the guide wire and the catheter 2. When the guide wire attempts to guide the catheter 1 through the bifurcation or bend of the blood vessel, the catheter 1 is in an ideal position, so that there is almost no "window sill effect", which improves the success rate of the operation.

[0046] It will be understood that the above description is merely exemplary and the embodiments of the present application do not limit this.

[0047] The above are only 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 protection of the pending claims of the present invention.

Claims

1. A thrombus aspiration catheter assembly, comprising a catheter (1) and a guide wire, wherein the guide wire is inserted into the catheter (1) and used to guide the catheter (1) to a set position, characterized in that: The distal end of the catheter (1) is provided with an extension section (3), and the extension section (3) has an axially extending inner cavity (301) for allowing a guide wire to pass through. The outer diameter of the extension section (3) is adapted to the inner diameter of the catheter (1), and the diameter of the inner cavity (301) of the extension section (3) is not less than the outer diameter of the guide wire; the proximal end of the extension section (3) is provided with a pushing structure (2) for pushing the extension section (3) to slide in the catheter (1) so as to extend the distal end of the catheter (1) or withdraw the catheter (1).

2. The thrombus aspiration catheter assembly according to claim 1, characterized in that: A limiting structure (4) is provided between the extension section (3) and the catheter (1) for limiting the maximum length of the extension section (3) extending from the distal end of the catheter (1) to ensure that the extension section (3) and the catheter (1) are continuously matched.

3. The thrombus aspiration catheter assembly according to claim 2, characterized in that: The diameter of the inner cavity (301) of the extension section (3) is adapted to the outer diameter of the guide wire.

4. The thrombus aspiration catheter assembly according to claim 2, characterized in that: A guide structure (5) is provided between the extension section (3) and the conduit (1) to ensure that the extension section (3) slides axially within the conduit (1).

5. The thrombus aspiration catheter assembly according to claim 4, characterized in that: The guide structure (5) includes an axially extending guide groove (501) and a sliding protrusion (502), the cross section of the sliding protrusion (502) being adapted to the cross section of the guide groove (501), the guide groove (501) being arranged on one of the components of the conduit (1) and the extension section (3), and the sliding protrusion (502) being arranged on the other component.

6. The thrombus aspiration catheter assembly according to claim 5, characterized in that: The guide groove (501) is arranged on the inner side wall of the conduit (1), and the corresponding sliding protrusion (502) is arranged on the outer side wall of the extension section (3).

7. The thrombus aspiration catheter assembly according to claim 5, characterized in that: The cross section of the guide groove (501) is rectangular.

8. The thrombus aspiration catheter assembly according to any one of claims 2 to 7, characterized in that: The limiting structure (4) comprises a buckle (401) and a locking hole (402); the buckle (401) has an elastically retractable clamping block (403) that can be clamped in the locking hole (402); the clamping block (403) is engaged in the locking hole (402) to achieve locking of the limiting structure (4); the buckle (401) is provided on one of the components of the conduit (1) and the extension section (3); and the locking hole (402) is provided on the other component.

9. The thrombus aspiration catheter assembly according to claim 8, characterized in that: The buckle (401) is arranged on the inner side wall of the catheter (1), and the corresponding locking hole (402) is arranged on the extension section (3).

10. The thrombus aspiration catheter assembly according to claim 8, characterized in that: The buckle (401) is arranged in the guide groove (501) of the catheter (1), and the locking hole (402) is arranged on the sliding protrusion (502) of the extension section (3).

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