Suction catheter

Abstract

The utility model provides a suction catheter, and belongs to the technical field of medical instruments for interventional operations. The suction catheter at least comprises an outer protection layer located on the outermost side, an inner cavity forming layer located on the innermost side and a supporting layer located between the outer protection layer and the inner cavity forming layer, the far end of the supporting layer is of a metal tube structure, and notches in regular bending shapes are evenly formed in the metal tube structure; the technical problem that an existing suction catheter is insufficient in far-end bending performance or insufficient in supporting performance is solved.

Description

Technical Field

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

[0002] The working process of the thrombus aspiration catheter is to transport the distal end of the aspiration catheter to the embolism site through the vein, connect the proximal end to the negative pressure device, and use the negative pressure aspiration principle to suck the thrombus out of the body.

[0003] The wall of existing suction catheters is mostly a three-layer structure, generally composed of an inner cavity forming layer located inside, an outer protective layer located outside, and an intermediate support layer located between the inner cavity forming layer and the outer protective layer, wherein the inner cavity forming layer and the outer protective layer are both made of polymer materials.

[0004] The middle support layer is mostly made of wire winding springs or wire braiding. Different winding springs or braiding, or the overlap of the two, are selected according to different tube structures. The middle support layer provides most of the catheter tensile strength, support performance, and bending performance for the main body of the catheter performance.

[0005] The existing intermediate support layer has the following problems:

[0006] 1. Although the braided structure has strong support, the metal wires overlap each other, resulting in insufficient bending performance of the braided part, which is not easy to bend. Therefore, it is not suitable for the distal end of the catheter that needs to flexibly pass through tortuous blood vessels.

[0007] 2. The spring-wound structure is relatively soft and has good bending performance, but poor supporting performance. When the inner and outer diameters of the catheter are large, the distal end is close to the suction port and needs to be delivered to the end of the blood vessel with a narrow inner diameter. The catheter is prone to collapse or extrusion deformation, which will lead to insufficient support performance at the distal end of the catheter.

[0008] Therefore, it is necessary to provide an improved technical solution to address the above-mentioned deficiencies in the prior art. Utility Model Content

[0009] The utility model aims to provide a suction catheter to solve the technical problem that the distal end of the existing suction catheter has insufficient bending performance or insufficient supporting performance.

[0010] In order to achieve the above-mentioned purpose, the suction catheter of the present invention provides the following technical solutions:

[0011] A suction catheter comprises at least an outer protective layer located at the outermost side, an inner cavity forming layer located at the innermost side, and a support layer between the outer protective layer and the inner cavity forming layer. The distal end of the support layer is a metal tube structure, and the metal tube structure is evenly arranged with cuts with regular bending shapes.

[0012] As a further optimized technical solution, the incision is in the shape of a U-shaped wave that extends continuously and has openings that are alternately and oppositely arranged.

[0013] As a further optimized technical solution, the extending direction of the incision is parallel to the axial direction of the support layer, and a plurality of U-shaped wave-shaped incisions are arranged at intervals along the circumference of the support layer.

[0014] As a further optimized technical solution, the incision is provided with at least two sections along the axial extension direction, and at least half of the waveforms at opposite ends of any two adjacent sections of the incision are staggered with each other.

[0015] As a further optimized technical solution, the incision is roughly in the shape of an intermittently arranged sine curve, and the incision is close to a complete variation cycle.

[0016] As a further optimized technical solution, the cuts are generally arranged in a discontinuous sinusoidal shape, and the cuts are close to a complete change cycle. The cuts are arranged to extend spirally around the supporting layer axially, and the troughs and crests of any adjacent cuts are opposite to each other.

[0017] As a further optimized technical solution, the incision is in the shape of an angle bracket.

[0018] As a further optimized technical solution, the incisions with openings in the same direction are evenly spaced along the circumference of the support layer, and the incisions with openings in opposite directions are staggered along the axial direction of the support layer.

[0019] As a further optimized technical solution, the proximal end of the support layer is a metal wire braided structure or a metal wire spring structure.

[0020] As a further optimized technical solution, the metal tube structure is made of nickel-titanium alloy.

[0021] Beneficial effects: By adopting a metal tube structure at the distal end and evenly arranging incisions with regular bending shapes on the metal tube, the tube wall of the metal tube has good supporting performance, and at the same time the incision makes the metal tube have bending performance, so that the distal end of the suction catheter has both supporting performance and good bending performance, which increases the convenience of the catheter during use, is suitable for complex situations in different sections of the blood vessels, and can better and faster establish intravascular access. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] 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:

[0023] Figure 1 It is a structural schematic diagram of Example 1 of the suction catheter of the utility model;

[0024] Figure 2 It is a structural schematic diagram of Embodiment 2 of the suction catheter of the utility model;

[0025] Figure 3 It is a structural stereogram of Embodiment 2 of the suction catheter of the utility model;

[0026] Figure 4 This is a schematic structural diagram of Example 3 of the suction catheter of the utility model.

[0027] Figure 1 Middle: 101, support layer; 102, incision;

[0028] Figure 2 , 3 Middle: 201, support layer; 202, incision;

[0029] Figure 4 Middle: 301, support layer; 302, incision. DETAILED DESCRIPTION

[0030] 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 protection scope of the present invention.

[0031] In the description of the present invention, the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom" and the like indicate directions or positional relationships 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 cannot be understood as limitations on the present invention. The terms "connected" and "connection" 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.

[0032] The present invention will be described in detail below with reference to the accompanying drawings and in combination 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.

[0033] Embodiment 1:

[0034] The utility model provides a suction catheter, which is configured such that the distal end of the support layer in the suction catheter is configured as a metal tube structure, and cutouts with regular bending shapes are evenly arranged on the metal tube, so that the distal end of the suction catheter has both supporting performance and good bending performance.

[0035] Specifically, Figure 1 As shown, the suction catheter includes an outer protective layer (not shown in the figure) located on the outermost side and made of a polymer material, an inner cavity forming layer (not shown in the figure) located on the innermost side and made of a polymer material, and a support layer 101 between the outer protective layer and the inner cavity forming layer. In other embodiments, the suction catheter may also include a layered structure for achieving other functions.

[0036] In this embodiment, the proximal end of the support layer 101 can be a metal wire braided structure or a metal wire spring structure. The proximal end and the distal end of the support layer 101 are fixedly connected. The fixed connection method can be a common fixing method such as bonding or welding. The distal end of the support layer 101 adopts a metal tube structure. The metal tube structure is made of nickel-titanium alloy, and cuts 102 with regular bending shapes are evenly arranged on the metal tube.

[0037] In this embodiment, the cutout 102 is a U-shaped wave shape that extends continuously and has openings that are alternately arranged in opposite directions. The extending direction of the cutout 102 is parallel to the axial direction of the support layer 101, and multiple U-shaped wave-shaped cutouts 102 are arranged at intervals along the circumference of the support layer 101. This shape of cutout 102 can enhance the support of the large lumen suction catheter, and greatly increase the support of the distal end of the support layer 101 while maintaining a certain flexibility and bending strength. If the diameter of the distal end of the suction catheter is large, this type of structure can be used. The metal tube with this type of cutout 102 as the support layer 101 improves the applicability of the large lumen suction catheter.

[0038] In order to increase the bending performance of the distal end of the support layer 101, at least two sections of the cutout 102 are arranged along the axial extension direction, and at least half of the waveform of the opposite ends of any two adjacent sections of the cutout 102 are staggered with each other. In this way, when in use, the joint of any two adjacent sections of the cutout 102 has better bending performance because the cutouts are more dense, so that the catheter can flexibly change the delivery route according to the curvature of the blood vessel when it is delivered in the blood vessel.

[0039] Embodiment 2:

[0040] In this embodiment, different from the embodiment 1, the cutouts 202 are substantially in the shape of intermittently arranged sinusoidal curves, that is, the cutouts are intermittently opened along the axial extension direction on the support layer 201, as shown in FIG. Figure 2 , Figure 3 As shown, each cutout 202 is close to a complete variation cycle.

[0041] In this embodiment, the suction catheter includes an outer protective layer (not shown in the figure) located on the outermost side and made of a polymer material, an inner cavity forming layer (not shown in the figure) located on the innermost side and made of a polymer material, and a support layer 201 located between the outer protective layer and the inner cavity forming layer. The proximal end of the support layer 201 can be a metal wire woven structure or a metal wire spring structure. The proximal end and the distal end of the support layer 201 are fixedly connected, and the fixed connection method can be a common fixing method such as bonding or welding. The distal end of the support layer 201 adopts a metal tube structure, and the metal tube structure is provided with the above-mentioned incision 202.

[0042] Furthermore, the cutouts 202 are arranged to extend spirally around the axial direction of the support layer 201, and the troughs are opposite to each other and the crests are opposite to each other between any adjacent cutouts 202. This ensures that the cutouts 202 are arranged at the highest density, thereby increasing the bending performance of the support layer 201.

[0043] This shape of the incision 202 can enhance the twist control of the suction catheter, while also ensuring a certain degree of support performance and flexibility, and can still provide the catheter with good twist control capabilities after bending. This type of cut tube is suitable for suction catheters with winding paths that require multiple changes of direction.

[0044] Embodiment 3:

[0045] In this embodiment, different from the first embodiment, the cutout 302 is in the shape of an angle bracket. Figure 4 As shown, the angle bracket-shaped cutouts 302 have two forms with opposite directions. The cutouts 302 with the same opening direction are evenly spaced along the circumference of the support layer 301, and the cutouts 302 with opposite opening directions are staggered along the axial direction of the support layer 301. That is, looking at a circle of cutouts 302 evenly arranged along the circumference of the support layer 301, the opening direction of the circle of cutouts 302 is the same, but the openings of any two adjacent circles of cutouts 302 are opposite, and any two adjacent circles of cutouts 302 are staggered. This is also to ensure the maximum density of the cutouts 302, thereby increasing the bending performance of the support layer 301.

[0046] In this embodiment, the suction catheter includes an outer protective layer (not shown in the figure) located on the outermost side and made of a polymer material, an inner cavity forming layer (not shown in the figure) located on the innermost side and made of a polymer material, and a support layer 301 located between the outer protective layer and the inner cavity forming layer. The proximal end of the support layer 301 can be a metal wire woven structure or a metal wire spring structure. The proximal end and the distal end of the support layer 301 are fixedly connected, and the fixed connection method can be a common fixing method such as bonding or welding. The distal end of the support layer 301 adopts a metal tube structure, and the metal tube structure is provided with the above-mentioned incision 302.

[0047] The shape of the incision 302 enhances the flexibility of the suction catheter, and enables the catheter to smoothly pass through complex curved blood vessels and 360° curved blood vessels.

[0048] In summary, the suction catheter provided by the utility model, by setting the distal end of the support layer as a metal tube structure, and opening a cut with a regular bending shape on the metal tube structure, makes the distal end of the suction catheter have both supporting performance and bending performance compared to the prior art, thereby enhancing the practicability of the suction catheter.

[0049] It should be understood that the above description is merely exemplary and the embodiments of the present application do not limit this.

[0050] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, 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 suction catheter, comprising at least an outer protective layer located at the outermost side, an inner cavity forming layer located at the innermost side, and a support layer (101, 201, 301) located between the outer protective layer and the inner cavity forming layer, characterized in that: The distal end of the support layer (101, 201, 301) is a metal tube structure, and the metal tube structure is evenly arranged with cutouts (102, 202, 302) having regular bending shapes.

2. The suction catheter according to claim 1, characterized in that The incision (102) is in the shape of a U-shaped wave that extends continuously and has openings that are alternately and oppositely arranged.

3. The suction catheter according to claim 2, characterized in that The extension direction of the cutout (102) is parallel to the axial direction of the support layer (101), and a plurality of U-shaped wave-shaped cutouts (102) are arranged at intervals along the circumference of the support layer (101).

4. The suction catheter according to claim 3, characterized in that The cutout (102) is provided with at least two sections along the axial extension direction, and at least half of the waveforms at opposite ends of any two adjacent sections of the cutout (102) are staggered with each other.

5. The suction catheter according to claim 1, characterized in that The incisions (202) are in the shape of a discontinuously arranged sinusoidal curve.

6. The suction catheter according to claim 5, characterized in that The cutouts (202) are arranged to extend in a spiral manner axially around the support layer (201), and the troughs between any adjacent cutouts (202) are opposite to each other, and the crests are opposite to each other.

7. The suction catheter according to claim 1, characterized in that: The cutout (302) is in the shape of an angle bracket.

8. The suction catheter according to claim 7, characterized in that The cutouts (302) with openings facing the same direction are evenly spaced along the circumference of the support layer (301), and the cutouts (302) with openings facing opposite directions are staggered along the axial direction of the support layer (301).

9. The suction catheter according to any one of claims 1 to 8, characterized in that: The proximal end of the support layer (101, 201, 301) is a metal wire braided structure or a metal wire spring wound structure.

10. The suction catheter according to any one of claims 1 to 8, characterized in that: The metal tube structure is made of nickel-titanium alloy.

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