Vascular interventional catheters

Abstract

The present invention discloses a vascular intervention catheter, comprising a tube seat and a tube body, the tube body comprising an inner layer, a middle layer and an outer layer which are stacked in sequence from the inside to the outside, the outer surface of the middle layer is provided with a spiral protrusion component along the length direction, the spiral protrusion component spirally extends at least along the distal section of the middle layer to form a spiral pattern protruding outward at least on the distal section of the outer layer, the distal section of the outer layer is a spiral layer, the spiral layer is wound around the outer surface of the middle layer along the spiral path formed by the spiral protrusion component, and after being melted, it intersects at the spiral protrusion component to tightly cover the spiral protrusion component and form the aforementioned spiral pattern, thereby ensuring complete fit between the outer layer and the spiral protrusion component, avoiding the problem of reduced structural strength due to gaps, and at the same time improving the overall durability and surface smoothness of the catheter, and optimizing its passability and controllability.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to a vascular intervention catheter. Background Art

[0002] Vascular interventional catheters are slender and flexible medical devices that are widely used in the diagnosis and treatment of cardiovascular, cerebrovascular and peripheral vascular systems. These catheters can be accurately guided to specific locations in the body to perform a series of interventional procedures. For such catheters, good torsional control is one of the key attributes, because it determines whether the doctor can accurately control the direction and position of the catheter tip, especially when facing tortuous or narrow vascular pathways.

[0003] In order to improve the torsion controllability of the catheter, Chinese utility model patent CN211705584U provides a protruding spiral winding wire on the outer surface of the inner layer of the catheter. After the outer layer of the catheter is covered with the spiral winding wire, its outer surface is raised by the pressure of the spiral winding wire to form a spiral pattern. The spiral pattern can convert the rotational torque into a thrust for the catheter to move forward or backward, solving the problem that the existing soft tube body is difficult to push in narrow blood vessels, and can be effectively used in tortuous blood vessels.

[0004] However, CN211705584U relies on the spiral winding wire on the outer surface of the catheter middle layer to directly press against the outer layer of the catheter to form a spiral pattern, which may bring some potential problems. Specifically, since the spiral winding wire directly acts on the outer layer of the catheter, it may cause the two to have the following problems: Figure 1 The gap shown, although such a gap does not generally pose a risk of leakage of blood or other body fluids, does affect the overall structural strength of the catheter, reducing its durability and reliability, and may affect the smoothness and passability of the catheter. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a vascular intervention catheter in view of the above-mentioned defects in the prior art to ensure that the protrusion of the middle layer of the catheter is tightly fitted with the outer layer of the catheter, so as to effectively avoid the problem of decreased structural strength caused by gaps.

[0006] According to the present invention, a vascular intervention catheter is provided, comprising a tube seat and a tube body, the tube body comprising an inner layer, a middle layer and an outer layer which are stacked in sequence from the inside to the outside, the outer surface of the middle layer is provided with a spiral protrusion component along the length direction, the spiral protrusion component extends spirally at least along the distal section of the middle layer to form a spiral pattern protruding outward at least on the distal section of the outer layer, the distal section of the outer layer is a spiral layer, the spiral layer is wound around the outer surface of the middle layer along the spiral path formed by the spiral protrusion component, and after melting, they intersect at the spiral protrusion component to tightly cover the spiral protrusion component and form the aforementioned spiral pattern.

[0007] Furthermore, the spiral layer includes a first core wire, which is arranged in close contact with the spiral protrusion component and is configured to intersect at the spiral protrusion component after melting.

[0008] Furthermore, the spiral layer includes a first core wire and a second core wire, the first core wire and the second core wire are alternately arranged and separated by a spiral protrusion component, and the first core wire and the second core wire are configured to meet at the spiral protrusion component after being melted.

[0009] Furthermore, the first core wire and the second core wire are made of different materials so that they have different flexibility.

[0010] Furthermore, the middle layer is a braided layer woven from braided wires, and the spiral protrusion component extends spirally along the length direction of the braided layer.

[0011] Further, the spiral protrusion member is a continuous spiral rib to form a continuous spiral path, and the spiral layer is spirally wound along the continuous spiral path.

[0012] Furthermore, the middle layer is woven from at least a first braided wire and a second braided wire, and the cross-sectional area of ​​the second braided wire is greater than the cross-sectional area of ​​the first braided wire to form the spiral rib.

[0013] Furthermore, the middle layer is woven from at least a first braided wire, and a spiral wire is wound around the outer surface of the middle layer, and the spiral wire forms the spiral rib.

[0014] Further, the spiral protrusion member is composed of a plurality of protrusion points distributed at periodic or non-periodic intervals to form a discontinuous spiral path, and the spiral layer is spirally wound along the discontinuous spiral path.

[0015] Furthermore, the middle layer is woven from at least a first braided wire, and a plurality of protruding points are fixed on the first braided wire.

[0016] Compared with the prior art, the present invention sets the distal end section of the outer layer of the catheter as a spiral layer, which is wound along the path formed by the spiral protrusion component on the outer surface of the intermediate layer and intersects at the spiral protrusion component after melting treatment, thereby achieving seamless coating of the spiral protrusion component and forming a stable spiral pattern. This design ensures complete fit between the outer layer of the catheter and the spiral protrusion component, avoids the problem of reduced structural strength due to gaps, and at the same time improves the overall durability and surface smoothness of the catheter, optimizing its passability and control performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] A more complete understanding of the invention and its attendant advantages and features will be more readily appreciated by referring to the following detailed description taken in conjunction with the accompanying drawings.

[0018] Figure 1 It is a structural schematic diagram of the prior art.

[0019] Figure 2 It is a schematic diagram of the overall structure of the first embodiment of the present invention.

[0020] Figure 3 It is a schematic diagram of the three-dimensional structure of the distal end section of the tube body in the first embodiment of the present invention.

[0021] Figure 4 It is a schematic cross-sectional structural diagram of the distal end section of the tube body in the first embodiment of the present invention.

[0022] Figure 5 It is a schematic diagram of the outer layer structure before melting in Example 1 of the present invention.

[0023] Figure 6 It is a schematic diagram of the structure of the intermediate layer in the first embodiment of the present invention.

[0024] Figure 7 It is a schematic diagram of the three-dimensional structure of another embodiment of the distal end section of the tube body in the first embodiment of the present invention.

[0025] Figure 8 It is a schematic diagram of the outer layer structure before melting in Example 2 of the present invention.

[0026] Fig. 9 It is a schematic diagram of the structure of the intermediate layer in the third embodiment of the present invention.

[0027] Fig.10 It is a schematic diagram of the three-dimensional structure of the distal end section of the tube body in the fourth embodiment of the present invention.

[0028] Fig.11 It is a schematic diagram of the structure of the intermediate layer in the fourth embodiment of the present invention.

[0029] In the accompanying drawings: 10 is a tube seat; 20 is a tube body, 21 is an inner layer, 22 is an intermediate layer, 221 is a first braided wire, 222 is a second braided wire, 223 is a spiral wire, 224 is a raised point, 23 is an outer layer, 231 is a first core wire, 232 is a second core wire; 30 is a spiral raised component.

[0030] It should be noted that the drawings are used to illustrate the present invention, rather than to limit the present invention. Note that the drawings showing the structures may not be drawn to scale. In addition, in the drawings, the same or similar elements are marked with the same or similar reference numerals. DETAILED DESCRIPTION

[0031] In order to make the contents of the present invention clearer and easier to understand, the contents of the present invention are described in detail below in conjunction with specific embodiments and drawings.

[0032] The "proximal end" and "distal end" referred to in the present invention should be understood as being viewed from the direction of the attending physician. The "proximal end" refers to the end close to the attending physician, which corresponds to the "left end" referred to in the reference drawings, and the "distal end" refers to the end away from the attending physician, which corresponds to the "right end" referred to in the reference drawings. Similarly, the "proximal segment" refers to a segment or a specific area close to the attending physician, and the "distal segment" refers to a segment or a specific area away from the attending physician.

[0033] Embodiment 1: The design of the vascular intervention catheter in this embodiment aims to optimize its passability and maneuverability under complex vascular conditions. Figures 2 to 4 As shown, the vascular intervention catheter of this embodiment includes a tube seat 10 and a tube body 20, and the tube body 20 includes an inner layer 21, an intermediate layer 22 and an outer layer 23 which are stacked from the inside to the outside. The outer surface of the intermediate layer 22 is provided with a spiral protrusion member 30 along the length direction, and the spiral protrusion member 30 at least extends spirally along the distal section of the intermediate layer 22 to ensure that a spiral pattern protruding outward is formed on the distal section of the outer layer 23. The distal section of the outer layer 23 is a spiral layer, which is wound around the outer surface of the intermediate layer 22 along the spiral path formed by the spiral protrusion member 30, and after melting treatment, it intersects and fuses together at the spiral protrusion member 30, and tightly covers the spiral protrusion member 30, so as to form the aforementioned spiral pattern. This design not only ensures the complete fit between the outer layer 23 and the spiral protrusion member 30, avoids the problem of structural strength reduction caused by the gap, but also improves the overall durability and surface smoothness of the catheter, and optimizes its passability and control performance.

[0034] Specifically, combined Figure 5 As shown, the spiral layer of the distal segment of the outer layer 23 includes a first core wire 231, and the first core wire 231 is a plastic core wire that is easy to melt. The spiral protrusion member 30 is a metal member, which plays a supporting role and enhances the mechanical strength of the catheter. The first core wire 231 is wound around the outer surface of the intermediate layer 22 along the spiral path formed by the spiral protrusion member 30, and is arranged in a fit with the spiral protrusion member 30, so that the first core wire 231 and the spiral protrusion member 30 are alternately arranged in a spiral, which is convenient for the spiral winding of the first core wire 231. When heated to a molten state, the first core wire 231 intersects and fuses together at the spiral protrusion member 30 to form a continuous and firm outer layer structure, which not only improves the tightness of the spiral layer, but also ensures uniform coverage after melting, and avoids the generation of local weak points. In addition, the presence of the spiral protrusion member 30 provides additional support, making the spiral pattern more stable, and enhancing the propulsion and control performance of the catheter during rotation. The proximal segment of the outer layer 23 is a conventional structure, and can also be consistent with the structure of its distal segment.

[0035] The middle layer 22 is a braided layer woven from braided wires. The spiral protrusion member 30 spirally extends along the length direction of the braided layer to form a continuous spiral rib, constructing a continuous spiral path. The spiral layer formed by the first core wire 231 is spirally wound along this continuous path, ensuring the consistency and stability of the spiral pattern. Figure 6 As shown, the middle layer 22 is woven from at least a first braided wire 221 and a second braided wire 222, wherein the cross-sectional area of ​​the second braided wire 222 is greater than the cross-sectional area of ​​the first braided wire 221, thereby forming a spiral rib. Thus, the second braided wire 222 of the middle layer 22 directly forms the spiral protrusion member 30, which enhances the mechanical strength of the catheter and improves its torsion resistance to a certain extent, so that the doctor can more flexibly control the position and direction of the catheter during operation.

[0036] It should be noted that due to the interaction between the second braided wire 222 and the first braided wire 221 of the middle layer 22, that is, the cross-winding between the two is not completely regular and smooth, which may cause the path of the second braided wire 222 to change locally. This change is reflected in that the second braided wire 222 in some areas may not maintain a continuous spiral shape, but instead construct a spiral shape such as Figure 7 In summary, by optimizing the design of the outer layer 23, the spiral layer formed by the first core wire 231 is wound around the spiral protrusion member 30, and the spiral layers are intersected and fused in a molten state to form a whole, tightly covering the spiral protrusion member 30, and forming a uniform spiral pattern. This intersection effect not only ensures the complete fit between the outer layer 23 and the spiral protrusion member 30, avoiding the problem of reduced structural strength due to gaps, but also enhances the overall durability and surface smoothness of the catheter.

[0037] Embodiment 2: Different from Embodiment 1, Figure 8As shown, the structure of the outer layer 23 of this embodiment is different. Specifically, the spiral layer of the distal end section of the outer layer 23 is composed of a first core wire 231 and a second core wire 232, both of which are plastic core wires that are easy to melt and have approximately the same melting point. The first core wire 231 and the second core wire 232 are arranged alternately and separated by a spiral protrusion member 30, that is, in each circle of spiral winding, the first core wire 231 and the second core wire 232 alternately cross the spiral protrusion member 30. When heated to a molten state, the first core wire 231 and the second core wire 232 meet and fuse together at the spiral protrusion member 30 to form a continuous and firm outer layer structure. This alternating arrangement not only improves the tightness of the spiral layer, but also ensures uniform coverage after melting, avoiding the generation of local weak points. In addition, the presence of the spiral protrusion member 30 provides additional support, making the spiral pattern more stable, and enhancing the propulsion and control performance of the catheter during rotation. Moreover, the first core wire 231 and the second core wire 232 are made of different materials, which makes the flexibility of the two different. This material difference gives the outer layer 23 and even the distal section of the entire catheter better flexibility and adaptability. The reason is that the first core wire 231 and the second core wire 232 are wound alternately, thereby realizing an alternating arrangement with gradually changing flexibility. This arrangement enables the distal section of the outer layer 23 to achieve an ideal balance between flexibility and support, which not only ensures the flexibility of the catheter as a whole, but also ensures its stability and controllability in complex vascular pathways.

[0038] The first core wire 231 and the second core wire 232 of this embodiment are made of different materials, so that the outer layer 23 achieves an ideal balance between flexibility and support, and is easy to pass through a tortuous blood vessel path.

[0039] The other structures of this embodiment are consistent with those of the first embodiment and will not be described again here.

[0040] Embodiment 3: Different from Embodiment 1, Fig. 9 As shown, the structure of the intermediate layer 22 of this embodiment is different. Specifically, the intermediate layer 22 is woven only by the first braided wire 221, and the outer surface thereof is wound with a spiral wire 223, and the spiral wire 223 forms a spiral rib to constitute the spiral protrusion member 30. In this design, the spiral wire 223 is directly wound on the outer surface of the intermediate layer 22 to form a spiral rib, thereby enhancing the torsional rigidity of the catheter and simplifying the manufacturing process.

[0041] The other structures of this embodiment are consistent with those of the first embodiment and will not be described again here.

[0042] Embodiment 4: Different from Embodiment 3, the Fig.10 and Fig.11As shown, the structure of the intermediate layer 22 of this embodiment has been improved again. Specifically, a plurality of raised points 224 are fixed on the first braided wire 221, and these raised points 224 are distributed at intervals periodically or non-periodically, forming a spiral rib as a whole to form a spiral raised member 30, and finally forming a discontinuous spiral path together. This design allows the spiral layer to form an enhanced spiral pattern at a specific position, providing a local reinforcement effect. The design of the plurality of raised points 224 also allows the number and distribution of the raised points to be adjusted according to actual needs, thereby optimizing the performance of the catheter under different vascular conditions.

[0043] The other structures of this embodiment are consistent with those of the third embodiment and will not be described again here.

[0044] It is to be understood that, although the present invention has been disclosed as a preferred embodiment, the above embodiment is not intended to limit the present invention. For any person skilled in the art, without departing from the scope of the technical solution of the present invention, the technical content disclosed above can be used to make many possible changes and modifications to the technical solution of the present invention, or modified into equivalent embodiments of equivalent changes. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the scope of protection of the technical solution of the present invention.

Claims

1. A vascular intervention catheter, comprising a tube seat (10) and a tube body (20), wherein the tube body (20) comprises an inner layer (21), an intermediate layer (22) and an outer layer (23) which are stacked in sequence from the inside to the outside, wherein a spiral protrusion component (30) is provided on the outer surface of the intermediate layer (22) along the length direction, wherein the spiral protrusion component (30) extends spirally at least along the distal end section of the intermediate layer (22) to form a spiral pattern protruding outward at least on the distal end section of the outer layer (23), wherein the spiral pattern is characterized in that: The distal end section of the outer layer (23) is a spiral layer, which is wound around the outer surface of the intermediate layer (22) along the spiral path formed by the spiral protrusion component (30), and after being melted, intersects at the spiral protrusion component (30) to tightly cover the spiral protrusion component (30) and form the spiral pattern; the intermediate layer (22) is a braided layer woven from braided wires, the spiral protrusion component (30) extends spirally along the length direction of the braided layer, and the braided wire or a plurality of protrusions on the braided wire form the spiral pattern.

2. The vascular intervention catheter according to claim 1, characterized in that: The spiral layer comprises a first core wire (231), the first core wire (231) being arranged in close contact with the spiral protrusion component (30) and being configured to intersect at the spiral protrusion component (30) after being melted.

3. The vascular intervention catheter according to claim 1, characterized in that: The spiral layer comprises a first core wire (231) and a second core wire (232), wherein the first core wire (231) and the second core wire (232) are arranged alternately and separated by a spiral protrusion component (30), and the first core wire (231) and the second core wire (232) are configured to intersect at the spiral protrusion component (30) after being melted.

4. The vascular intervention catheter according to claim 3, characterized in that: The first core wire (231) and the second core wire (232) are made of different materials, resulting in different flexibility.

5. The vascular intervention catheter according to claim 1, characterized in that: The spiral protrusion member (30) is a continuous spiral rib to form a continuous spiral path, and the spiral layer is spirally wound along the continuous spiral path.

6. The vascular intervention catheter according to claim 5, characterized in that: The intermediate layer (22) is woven from at least a first braided wire (221) and a second braided wire (222), and the cross-sectional area of ​​the second braided wire (222) is greater than the cross-sectional area of ​​the first braided wire (221) to form the spiral rib.

7. The vascular intervention catheter according to claim 1, characterized in that: The spiral protrusion member (30) is composed of a plurality of protrusion points (224) distributed at periodic or non-periodic intervals to form a discontinuous spiral path, and the spiral layer is spirally wound along the discontinuous spiral path.

8. The vascular intervention catheter according to claim 7, characterized in that: The intermediate layer (22) is woven from at least a first braided wire (221), and a plurality of protruding points (224) are fixed on the first braided wire (221).

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