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 and an outer layer stacked in sequence from the inside to the outside, the outer layer comprising a first core wire and a second core wire, the second core wire is eccentrically placed in the first core wire and the two are combined and wound around the outer surface of the inner layer along the length direction of the inner layer, the first core wire is configured to be formed into a tubular layer after melting and tightly coated on the outer surface of the inner layer, the second core wire is encapsulated in the tubular layer to form a support structure supporting the tubular layer and is biased towards the inner wall of the tubular layer. The present invention no longer sets a separate intermediate layer, but uses the first core wire of the outer layer to directly form a tubular layer as the final outer layer after melting and molding, and at the same time uses the second core wire of the outer layer to be encapsulated in the tubular layer as a support structure to replace the traditional intermediate layer, which not only simplifies the overall structure and production cost, but also because the second core wire is close to the inner layer, the entire catheter can be made thinner, which significantly improves the flexibility and operation performance of the catheter.

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] Traditional vascular intervention catheters usually adopt a three-layer structural design, including an inner layer, an intermediate layer, and an outer layer that are stacked from the inside to the outside. Among them, the intermediate layer serves as the supporting structure of the catheter, providing the necessary mechanical strength and flexibility to ensure that the catheter can be smoothly advanced and maintain a stable shape in a complex vascular environment. For example, Chinese invention patent CN118871156A uses a braided fabric with multiple strands as an intermediate layer to enhance the overall torque transmission efficiency and anti-explosion capability of the catheter, thereby significantly improving the ability of the catheter to traverse complex vascular pathways. However, this traditional three-layer structure has some limitations: since the intermediate layer needs to be set separately to achieve the required support function, this not only increases the production cost, but also increases the thickness of the entire catheter, affecting its flexibility and limiting its application effect in narrow or curved blood vessels. Summary of the invention

[0003] 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, aiming to simplify the overall structure and manufacturing cost of the catheter and reduce the overall thickness of the catheter.

[0004] 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 and an outer layer stacked in sequence from the inside to the outside, the outer layer comprising a first core wire and a second core wire, the second core wire is eccentrically placed inside the first core wire and the two are combined and wound around the outer surface of the inner layer along the length direction of the inner layer, the first core wire is configured to be formed into a tubular layer after melting and tightly wrapped around the outer surface of the inner layer, the second core wire is encapsulated in the tubular layer to form a support structure supporting the tubular layer and is biased toward the inner wall of the tubular layer.

[0005] Furthermore, the first core wire and the second core wire are combined and wound on the outer surface of the inner layer in a spiral winding manner or a cross winding manner.

[0006] Furthermore, the material hardness of the inner layer is greater than that of the first core wire and less than that of the second core wire.

[0007] Furthermore, the inner layer and the first core wire are both made of plastic material, and the second core wire is made of metal material.

[0008] Furthermore, the outer wall of the tubular layer formed by the first core wire is in a straight line shape.

[0009] Furthermore, the outer wall of the tubular layer formed by the first core wire forms outwardly protruding lines under the action of the second core wire.

[0010] Furthermore, a developing wire is provided in the distal end section of the first core wire, and the developing wire is fixed on one side of the second core wire and faces the spiral pattern.

[0011] Furthermore, the developing wire is coaxially arranged with the first core wire.

[0012] Furthermore, the first core wire comprises at least two sub-core wire segments made of different materials, and all the sub-core wire segments are alternately distributed in sequence along the length direction of the first core wire, and merge and intersect at adjacent locations to form a composite segment.

[0013] Furthermore, the first core wire comprises at least two sub-core wire segments made of different materials, all of which are distributed along the length direction of the first core wire and have gradually decreasing material hardness from the proximal end to the distal end, and merge at adjacent locations to form a composite segment.

[0014] Compared with the prior art, the present invention no longer sets a separate middle layer, but uses the first core wire of the outer layer to directly form a tubular layer as the final outer layer after melt molding, and at the same time uses the second core wire of the outer layer to be encapsulated in the tubular layer as a supporting structure to replace the traditional middle layer. This not only simplifies the overall structure and production cost, but also because the second core wire is eccentrically set and close to the inner layer, the entire catheter can be made thinner, which significantly improves the flexibility and operational performance of the catheter. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] 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.

[0016] Figure 1 It is a schematic diagram of the overall structure of the first embodiment of the present invention.

[0017] Figure 2 It is a schematic diagram of the tube structure before melting in Example 1 of the present invention.

[0018] Figure 3 yes Figure 2 Schematic diagram of the cross-sectional structure.

[0019] Figure 4 It is a schematic diagram of the cross-sectional structure of the tube body after melting in the first embodiment of the present invention.

[0020] Figure 5 It is a schematic diagram of the tube structure after melting in the second embodiment of the present invention.

[0021] Figure 6 It is a schematic diagram of the tube structure before melting in the third embodiment of the present invention.

[0022] Figure 7 It is a schematic diagram of the tube structure after melting in the third embodiment of the present invention.

[0023] Figure 8 It is a schematic diagram of the structure of the first core wire in the fourth embodiment of the present invention.

[0024] Fig. 9 It is a schematic structural diagram of the first core wire, the second core wire and the developing wire in the fifth embodiment of the present invention.

[0025] Fig.10 It is a schematic diagram of the structure of the first core wire in the sixth embodiment of the present invention.

[0026] In the accompanying drawings: 10 is a tube seat; 20 is a tube body, 21 is an inner layer, 22 is an outer layer, 221 is a first core wire, 222 is a second core wire, 223 is a tubular layer; 30 is a texture; 40 is a developing wire.

[0027] 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

[0028] 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.

[0029] 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.

[0030] Embodiment 1: Figures 1 to 4 As shown, the vascular intervention catheter of this embodiment includes a tube seat 10 and a tube body 20, and the proximal end of the tube body 20 is fixedly connected to the distal end of the tube seat 10. The tube body 20 includes an inner layer 21 and an outer layer 22 stacked from the inside to the outside, and the outer layer 22 includes a first core wire 221 and a second core wire 222, and the second core wire 222 is eccentrically arranged in the first core wire 221. Specifically, the second core wire 222 is a solid wire, and the first core wire 221 is tightly wrapped around the outside of the second core wire 222 through an extrusion process to achieve an eccentric arrangement. The first core wire 221 and the second core wire 222 are combined and wound on the outer surface of the inner layer 21 in a spiral winding manner along the length direction of the inner layer 21. Since the melting point of the first core wire 221 is lower than that of the second core wire 222, after being heated and melted to form, the first core wire 221 forms a tubular layer 223 tightly wrapped on the outer surface of the inner layer 21. The outer wall of the tubular layer 223 is a conventional straight line, and the second core wire 222 is encapsulated in the tubular layer 223 as a supporting structure and biased towards the inner wall of the tubular layer 223.

[0031] This embodiment abandons the traditional three-layer structure and no longer sets a separate middle layer. Instead, the first core wire 221 of the outer layer 22 is directly formed into a tubular layer 223 as the final outer layer after melt molding. At the same time, the second core wire 222 of the outer layer 22 is encapsulated in the tubular layer 223, replacing the traditional middle layer to provide support functions. This method not only simplifies the overall structure and manufacturing process, and reduces production costs, but also because the second core wire 222 is biased toward the inner wall of the tubular layer 223 and close to the inner layer 21, the entire catheter can be made thinner, significantly improving the flexibility and operational performance of the catheter.

[0032] In this embodiment, the inner layer 21 and the first core wire 221 are both made of plastic, while the second core wire 222 is made of metal. The hardness of the inner layer 21 is greater than that of the first core wire 221 but less than that of the second core wire 222, ensuring that the support structure formed by the second core wire 222 has the strongest hardness and support, while the tubular layer 223 formed by the first core wire 221 after melt molding has the best flexibility, thereby ensuring that the blood vessel wall will not be damaged.

[0033] Embodiment 2: Different from Embodiment 1, Figure 5 As shown, the outer wall of the tubular layer 223 formed by the first core wire 221 of this embodiment is not in a conventional straight line, but forms an outwardly protruding pattern 30 under the action of the second core wire 222 to improve the twist control of the catheter. Specifically, the first core wire 221 not only fixes the second core wire 222 on the outer surface of the inner layer 21, but also naturally forms an outwardly protruding and continuous spiral pattern 30 under the action of the second core wire 222. In this way, not only the overall structure is simplified, but also the uniformity and consistency of the spiral pattern are ensured, and at the same time, the tubular layer 223 and the second core wire 222 are completely fitted to avoid the problem of reduced structural strength due to gaps.

[0034] The other structures of this embodiment are consistent with those of the first embodiment and will not be described again here.

[0035] Embodiment 3: Different from Embodiment 2, the Figure 6 As shown in the figure, the first core wire 221 and the second core wire 222 of this embodiment are combined and wound on the outer surface of the inner layer 21 in a cross-winding manner along the length direction of the inner layer 21. In this way, due to the interaction between the first core wire 221 and the second core wire 222, that is, the cross-winding between the two is not completely regular and smooth, a line as shown in FIG. Figure 7 The discontinuous lines 30 are shown.

[0036] The other structures of this embodiment are consistent with those of the second embodiment and will not be described again here.

[0037] Embodiment 4: Different from Embodiment 2, the first core wire 221 of this embodiment is composed of several sub-core wire segments of different materials, which are distributed along the length direction of the first core wire 221, and the hardness of the material gradually decreases from the proximal end to the distal end. Adjacent sub-core wire segments merge and intersect at the junction to form a composite segment, thereby achieving a smooth transition of hardness. Specifically, through the extrusion process, several sub-core wire segments of different materials of the first core wire 221 are tightly wrapped on the outside of the second core wire 222 in sequence and are eccentrically arranged. During the heating and melting molding process of the first core wire 221, two adjacent sub-core wire segments will merge and intersect at the junction to form a composite segment with a hardness between the two. For example, Figure 8 The hardness of the sub-core wire segments M1, M2 and M3 decreases successively. This design ensures that the tubular layer 223 formed by the first core wire 221 through heating and melting has the best flexibility at the farthest end, thereby improving the passability of the catheter, because the flexible distal part can more easily pass through complex vascular pathways, while the harder proximal part provides the necessary support.

[0038] The other structures of this embodiment are consistent with those of the second embodiment and will not be described again here.

[0039] Embodiment 5: Different from Embodiment 4, the Fig. 9 As shown, a developing wire 40 is provided in the distal section of the first core wire 221 of the present embodiment. The developing wire 40 is coaxially arranged with the first core wire 221, and is fixed to one side of the second core wire 222 by bonding, and faces the lines 30. In other embodiments, the developing wire 40 can also be fixedly connected to the second core wire 222 by welding or the like. Since the developing wire 40 can be clearly seen under X-ray fluoroscopy, it can help the doctor to accurately find the target position. In addition, the developing wire 40 can also act together with the second core wire 222 on the tubular layer 223 to form the lines 30, ensuring that the distal section of the first core wire 221 is neither too flexible nor too supportive, taking into account both passability and operability.

[0040] The other structures of this embodiment are consistent with those of the fourth embodiment and will not be described again here.

[0041] Embodiment 6: Different from Embodiment 4, the Fig.10 As shown, the first core wire 221 of this embodiment includes a plurality of sub-core wire segments N1 and sub-core wire segments N2, and the sub-core wire segments N1 and sub-core wire segments N2 are made of different materials. All sub-core wire segments N1 and sub-core wire segments N2 are alternately distributed along the direction of the first core wire 221, and merge and intersect at adjacent locations to form a composite segment. This alternating distribution method realizes an arrangement method of alternating flexibility, so that the formed tubular layer 223 as a whole achieves 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 control performance in complex vascular pathways.

[0042] The other structures of this embodiment are consistent with those of the fourth embodiment and will not be described again here.

[0043] 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) and an outer layer (22) stacked in sequence from the inside to the outside, characterized in that: The outer layer (22) comprises a first core wire (221) and a second core wire (222), the second core wire (222) being eccentrically disposed inside the first core wire (221) and the two being combined and wound around the outer surface of the inner layer (21) along the length direction of the inner layer (21), the first core wire (221) having a lower melting point than the second core wire (222), the first core wire (221) being configured to be formed into a tubular layer (223) after melting and tightly wrapped around the outer surface of the inner layer (21), the second core wire (222) being encapsulated inside the tubular layer (223) to form a supporting structure for supporting the tubular layer (223) and being biased towards the inner wall of the tubular layer (223), the outer wall of the tubular layer (223) forming outwardly protruding lines (30) under the action of the second core wire (222).

2. The vascular intervention catheter according to claim 1, characterized in that: The first core wire (221) and the second core wire (222) are combined and wound on the outer surface of the inner layer (21) in a spiral winding manner or a cross winding manner.

3. The vascular intervention catheter according to claim 1, characterized in that: The material hardness of the inner layer (21) is greater than that of the first core wire (221) and less than that of the second core wire (222).

4. The vascular intervention catheter according to claim 3, characterized in that: The inner layer (21) and the first core wire (221) are both made of plastic material, and the second core wire (222) is made of metal material.

5. The vascular intervention catheter according to claim 1, characterized in that: A developing wire (40) is provided in the distal end section of the first core wire (221), and the developing wire (40) is fixed on one side of the second core wire (222) and faces the texture (30).

6. The vascular intervention catheter according to claim 5, characterized in that: The developing wire (40) is coaxially arranged with the first core wire (221).

7. The vascular intervention catheter according to claim 1, characterized in that: The first core wire (221) comprises at least two sub-core wire segments made of different materials, and all the sub-core wire segments are alternately distributed in sequence along the length direction of the first core wire (221) and merged and joined at adjacent locations to form a composite segment.

8. The vascular intervention catheter according to claim 1, characterized in that: The first core wire (221) comprises at least two sub-core wire segments made of different materials, all of which are distributed along the length direction of the first core wire (221) and have a gradually decreasing material hardness from the proximal end to the distal end, and merge and intersect at adjacent locations to form a composite segment.

Images