Composite conduit

By designing adjustment components and traction components in the interventional catheter, the problems of insufficient support and bending diversity of the catheter are solved, and the catheter has high support and flexible bending, making it suitable for a variety of interventional surgical catheters and reducing production costs.

CN223366047UActive Publication Date: 2025-09-23M-DUKE MEDICAL TECH (SHANGHAI) CO LTD
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Patent Information

Application Number
CN202422295435.5
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-09-19
Publication Date
2025-09-23
Estimated Expiration
2034-09-19

AI Technical Summary

Technical Problem

Existing interventional catheters have deficiencies in support, compliance, flexure resistance, and bending diversity, especially in the dimensional space requirements and variable diameter applicability of composite tubes, which need to be improved.

Method used

A composite catheter is designed, in which an outer tube is provided on the outside of the inner tube, and a volume cavity is formed in the middle. An adjustment component is provided on the inside of the volume cavity. The adjustment component is composed of multiple kits. The inner and outer tubes are driven to bend by the traction component. The adjustment component is composed of a supporting part and a bending part. The supporting part and the bending part are hollow structures and the material is metal. The flexible bending of the catheter can be achieved through the traction component.

Benefits of technology

The catheter improves its supporting performance while maintaining its bendability, enhances its support and flexibility, is suitable for various interventional surgery catheters, and reduces production costs.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model discloses a composite guide pipe which comprises an inner layer pipe and an outer layer pipe. An outer-layer pipe is arranged on the outer side of the inner-layer pipe, and a volume cavity is formed between the inner-layer pipe and the outer-layer pipe and is communicated with the outside; an adjusting assembly is arranged on the inner side of the volume cavity and arranged on the outer side of the inner layer pipe in a sleeving mode, at least one or more traction assemblies are arranged on the adjusting assembly, the traction assemblies extend to the outer side of the volume cavity, and the traction assemblies drive the adjusting assembly to be bent in any direction. The inner-layer pipe and the outer-layer pipe are driven to deform; according to the device, the adjusting assembly composed of a plurality of external members is designed and arranged on the outer side of the inner-layer pipe in a sleeving mode, the adjusting assembly is driven to be bent through the traction assembly, the inner-layer pipe and the outer-layer pipe are driven to be bent, and meanwhile the supporting performance is improved while it is guaranteed that the catheter can be bent.
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Description

Technical Field

[0001] The utility model relates to the technical field of medical devices, in particular to a composite catheter. Background Art

[0002] With the increase in the types of interventional treatments and medical devices, the requirements for the structural performance of interventional surgical catheters in clinical use have also increased. In addition to the basic size limitations, they must also have one or more structural properties, such as support, compliance, anti-bending, bending diversity, and diameter change. Common interventional catheters on the market are generally three-layer composite tube structures consisting of an inner layer, an intermediate layer, and an outer layer. According to the structure of the intermediate layer, they are mainly divided into three categories: braided catheters, spring-wound catheters, and braided + spring-wound catheters. Braided catheters have better support than spring-wound catheters; spring-wound catheters have better compliance than braided catheters; braided + spring-wound catheters balance the advantages of the first two single structures while enhancing anti-bending properties. However, this structure has large requirements for the size and space of the composite tube, and its applicability to the requirements of catheter bending diversity and diameter change is relatively small. Utility Model Content

[0003] The purpose of the utility model is to solve the shortcomings of the prior art and to provide a composite catheter.

[0004] In order to achieve the above-mentioned purpose, the present invention adopts the following technical solution: a composite catheter, comprising:

[0005] Inner tube;

[0006] An outer tube is provided outside the inner tube, and a volume cavity is formed between the inner tube and the outer tube and is communicated with the outside;

[0007] An adjustment component is provided inside the volume cavity, and the adjustment component is sleeved on the outside of the inner tube. At least one or more traction components are provided on the adjustment component, and the traction component extends to the outside of the volume cavity. The traction component drives the adjustment component to bend in any direction, thereby driving the inner tube and the outer tube to deform.

[0008] As a further description of the above technical solution: the adjustment component is formed by connecting several kits in sequence, and the traction component is provided on several of the kits.

[0009] As a further description of the above technical solution: the kit includes a support part, one end of the support part is connected to the bending part, the bending part is connected to the support part of the adjacent kit, and one end of the traction assembly is installed on the side of the support part away from the bending part.

[0010] As a further description of the above technical solution: the support portion and the bending portion are hollow structures, a plurality of grooves arranged symmetrically or alternately are provided on the support portion, and the bending portion is a staggered or spiral structure formed by weaving.

[0011] As a further description of the above technical solution: the support portion is a uniform diameter or variable diameter structure, which is adapted to the shape of the inner tube.

[0012] As a further description of the above technical solution: the material of the adjustment component is metal, and the support part and the bending part are fixedly connected.

[0013] As a further description of the above technical solution: the inner tube includes a first tube body and a second tube body, the diameter of the first tube body is larger than the diameter of the second tube body, and the first tube body and the second tube body are connected by a first connecting section.

[0014] As a further description of the above technical solution: the outer tube includes a third tube body and a fourth tube body, the diameter of the third tube body is larger than the diameter of the fourth tube body, and the third tube body and the fourth tube body are connected by a second connecting section.

[0015] As a further description of the above technical solution: the traction assembly includes a traction wire, and a protective tube is provided on the outside of the traction wire.

[0016] Also included is a method for manufacturing a composite catheter, which is applicable to the composite catheter according to any one of the above technical solutions, comprising:

[0017] S1: Sleeve the inner tube onto the mandrel, connect the traction assembly to several sets of sleeves, sequentially sleeve the sets on the outer side of the inner tube, and connect the sets to form an adjustment assembly;

[0018] S2: Sleeve the outer tube on the outside of the adjusting assembly, and integrally connect the inner tube, the adjusting assembly and one end of the outer tube by welding;

[0019] S3: moving the core rod out from the inner side of the inner tube to form a composite conduit.

[0020] The above technical solution has the following advantages or beneficial effects:

[0021] 1. An adjustment component consisting of multiple kits is designed and placed on the outside of the inner tube. The adjustment component is driven to bend by the traction component, which drives the inner and outer tubes to bend. At the same time, while ensuring the bendability of the catheter, the support performance is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1This is a front view of the composite catheter proposed in the present invention;

[0023] Figure 2 A side view of the composite catheter proposed in the present invention;

[0024] Figure 3 This is an exploded view of the composite conduit proposed in the present invention;

[0025] Figure 4 This is a cross-sectional view of the composite catheter proposed in the present invention;

[0026] Figure 5 for Figure 4 A partial enlarged view of point A in the middle;

[0027] Figure 6 for Figure 4 A partial enlarged view of point B in the middle;

[0028] Figure 7 This is a flow chart of the manufacturing method proposed in the utility model.

[0029] Legend:

[0030] 1. Inner tube; 11. First tube body; 12. Second tube body; 13. First connecting section; 21. Third tube body; 22. Fourth tube body; 23. Second connecting section; 2. Outer tube; 3. Adjustment assembly; 31. Kit; 311. Support part; 312. Bending part; 4. Traction assembly; 41. Traction wire; 42. Protective tube. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe 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 without making creative efforts are within the scope of protection of the present invention.

[0032] Reference Figures 1-6 The utility model provides an embodiment: a composite catheter, comprising: an inner tube 1; an outer tube 2 is provided on the outside of the inner tube 1, a volume cavity is formed between the inner tube 1 and the outer tube 2, and is connected to the outside; an adjustment component 3 is provided on the inside of the volume cavity, the adjustment component 3 is sleeved on the outside of the inner tube 1, and at least one or more traction components 4 are provided on the adjustment component 3, the traction component 4 extends to the outside of the volume cavity, and the traction component 4 drives the adjustment component 3 to bend in any direction, driving the inner tube 1 and the outer tube 2 to deform.

[0033] In this embodiment, the inner tube 1 and the outer tube 2 are connected to form a volume cavity, and the adjustment component 3 is arranged in the volume cavity through one side. The traction component drives one side of the adjustment component to contract, and the side away from the traction component bends outward and expands, driving the inner tube 1 and the outer tube 2 to bend, and the entire catheter is supported by the adjustment component 3.

[0034] An adjustment component consisting of multiple kits is designed and placed on the outside of the inner tube. The adjustment component is driven to bend by the traction component, which drives the inner tube and the outer tube to bend. At the same time, while ensuring the bendability of the catheter, the supporting performance is improved.

[0035] The adjustment component 3 is formed by connecting several kits 31 in sequence, and a traction component 4 is provided on each of the kits 31; the kit 31 includes a support portion 311, one end of the support portion 311 is connected to the bending portion 312, and the bending portion 312 is connected to the support portion 311 of the adjacent kit 31, and one end of the traction component 4 is installed on the side of the support portion 311 away from the bending portion 312.

[0036] In this embodiment, the adjustment component 3 is composed of several kits 31 that are combined, superimposed, arranged or connected at the designed position according to actual needs to form a conduit that can be bent at any position. The kit 31 includes a support portion 311 and a bending portion 312, both of which are made of metal materials, and the support strength of the support portion 311 is greater than the support strength of the bending portion 312. By fixedly connecting the inner side of the support portion 311 with the traction component 4, the traction component 4 drives both the support portion 311 and the bending portion 312 to bend.

[0037] The support portion 311 and the bending portion 312 are hollow structures. The support portion 311 is provided with a plurality of grooves that are symmetrically or alternately arranged in sequence. The bending portion 312 is a staggered or spiral structure formed by weaving.

[0038] In this embodiment, a plurality of grooves are opened on the curved surface of the support portion 311, and the grooves are opened symmetrically or alternately. During the bending process, deformation is generated by squeezing the grooves, so that the support portion 311 is bent along the opening direction of the grooves. Furthermore, the different cutting shapes of the grooves are changed to enable the support portion 311 to have different bending directions and bending trajectories.

[0039] The bending portion 312 is formed by metal wires being connected in a grid-like manner. When bending occurs, the grid on the side close to the bending direction shrinks, and the side facing away from the bending direction stretches and expands. If the bending portion 312 is a spiral structure, the metal wire ring is arranged on the outside of the inner layer tube 1. When bending occurs, the metal wire gap on the side close to the bending direction shrinks, and the side facing away from the bending direction stretches and expands. Bending can be achieved in 360° directions. Other structures that can achieve the same bending effect will not be described in detail.

[0040] The material of the adjustment component 3 is metal, preferably memory metal, and the support portion 311 and the bending portion 312 are fixedly connected. One end of the support portion 311 and the bending portion 312 are fixedly connected by riveting, welding, bonding, overlapping, etc.

[0041] The support portion 311 is a uniform diameter or variable diameter structure, which is adapted to the shape of the inner tube 1; the inner tube 1 includes a first tube body 11 and a second tube body 12, the diameter of the first tube body 11 is larger than the diameter of the second tube body 12, and the first tube body 11 and the second tube body 12 are connected by a first connecting section 13, and the outer tube 2 includes a third tube body 21 and a fourth tube body 22, the diameter of the third tube body 21 is larger than the diameter of the fourth tube body 22, and the third tube body 21 and the fourth tube body 22 are connected by a second connecting section 23.

[0042] In this embodiment, in order to determine the relative position between the inner tube 1, the adjustment component 3 and the outer tube 2, a variable diameter structure is provided at the end away from the traction component 4 to facilitate sleeve positioning and connection fixation.

[0043] The diameter of the first tube body 11 is larger than that of the second tube body 12, and the two are connected by a first connecting section 13 with a gradually decreasing diameter, so that one end of the inner tube 1 forms a funnel-shaped structure;

[0044] The diameter of the third tube body 21 is larger than the diameter of the fourth tube body 22. The third tube body 21 and the fourth tube body 22 are connected by a second connecting section 23 with a gradually decreasing diameter, so that one end of the outer tube 2 forms a funnel-shaped structure, so that one end of the volume cavity formed in the middle is a cavity with a variable diameter. The support part 311 is a uniform diameter or variable diameter structure. The variable diameter part cooperates with the first connecting section 13 and the second connecting section 23, and the uniform diameter part cooperates with the second tube body 12 and the fourth tube body 22.

[0045] The adjustment component 3 has a wide range of applicability (such as applicable to guide catheters, access catheters, delivery sheaths, suction catheters, bending adjustment catheters, etc.), and has low processing difficulty and low production cost, which greatly improves the applicability of interventional catheters.

[0046] The traction assembly 4 includes a traction wire 41 , and a protective tube 42 is provided outside the traction wire 41 .

[0047] In this embodiment, one end of the traction wire 42 and the protective tube 42 are fixedly arranged on the inner curved surface of the end of the support part 311 away from the bending part 312. By pulling the traction wire 41 and the protective tube 42, the support part 311 is driven to bend, and then the bending part 312 is driven to bend, thereby realizing the overall bending of the catheter. In different kits 31, the connection angles of the traction assembly 4 at the cross section are different, so that different kits 31 can be bent in the same or different directions, so that the catheter as a whole can be bent at least in one or more places, and the control of the catheter intervention angle is more flexible and adjustable.

[0048] Reference Figure 7 , also includes a composite catheter manufacturing method, the manufacturing method is applicable to the composite catheter of any one of the above technical solutions, comprising:

[0049] S1: Sleeve the inner tube onto the core rod, connect the traction assembly to several sets of kits, sequentially sleeve the several sets of kits onto the outer side of the inner tube, and connect the several sets of kits to form an adjustment assembly;

[0050] S2: Sleeve the outer tube onto the outside of the adjustment assembly, and integrally connect the inner tube, the adjustment assembly, and one end of the outer tube by welding;

[0051] S3: The core rod is removed from the inner side of the inner tube to form a composite conduit.

[0052] In this embodiment, a mounting fixture such as a core rod is used to position the inner tube 1, and one end of the core rod is a variable diameter structure. The inner tube 1 is placed on the core rod and positioned by the first connecting section 13. A number of kits 31 and traction kits 4 are sleeved on the outside of the inner tube 1, and the kits 31 are rotated and adjusted in the required bending direction and then welded to form an adjustment kit 3. The outer tube 2 is sleeved on the outside of the adjustment kit 3, and the inner tube, the adjustment kit and one end of the outer tube are welded and fixed. After completion, the core rod is pulled out of the inner tube 1 to form a composite conduit.

[0053] The adjustment component is composed of multiple kits and is set on the outside of the inner tube. The traction component drives the adjustment component to bend, and drives the inner and outer tubes to bend. At the same time, while ensuring the bendability of the catheter, the support performance is improved.

[0054] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent replacements for some of the technical features therein. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A composite catheter, characterized in that: include: Inner tube (1); An outer tube (2) is provided outside the inner tube (1), and a volume cavity is formed between the inner tube (1) and the outer tube (2), and is communicated with the outside world; An adjusting component (3) is provided inside the volume cavity, and the adjusting component (3) is sleeved on the outside of the inner tube (1). At least one or more traction components (4) are provided on the adjusting component (3), and the traction components (4) extend to the outside of the volume cavity. The traction components (4) drive the adjusting component (3) to bend in any direction, thereby driving the inner tube (1) and the outer tube (2) to deform.

2. The composite catheter according to claim 1, characterized in that: The adjustment assembly (3) is formed by sequentially connecting a plurality of sets (31), and the traction assembly (4) is provided on each of the plurality of sets (31).

3. The composite catheter according to claim 2, characterized in that: The kit (31) comprises a supporting portion (311), one end of the supporting portion (311) is connected to a bending portion (312), and the bending portion (312) is connected to the supporting portion (311) of an adjacent kit (31).

4. The composite catheter according to claim 3, characterized in that: One end of the traction assembly (4) is mounted on a side of the support portion (311) away from the bending portion (312).

5. The composite catheter according to claim 3, characterized in that: The support portion (311) and the bending portion (312) are hollow structures. The support portion (311) is provided with a plurality of grooves that are symmetrically or alternately arranged in sequence. The bending portion (312) is a staggered or spiral structure formed by weaving.

6. The composite catheter according to claim 3, characterized in that: The support portion (311) is a uniform diameter or variable diameter structure, and is adapted to the shape of the inner layer tube (1).

7. The composite catheter according to claim 3, characterized in that: The material of the adjustment component (3) is metal, and the support portion (311) and the bending portion (312) are fixedly connected.

8. The composite catheter according to claim 1, characterized in that: The inner tube (1) comprises a first tube body (11) and a second tube body (12); the diameter of the first tube body (11) is larger than the diameter of the second tube body (12); the first tube body (11) and the second tube body (12) are connected via a first connecting section (13).

9. The composite catheter according to claim 1, characterized in that: The outer tube (2) comprises a third tube body (21) and a fourth tube body (22); the diameter of the third tube body (21) is larger than the diameter of the fourth tube body (22); and the third tube body (21) and the fourth tube body (22) are connected via a second connecting section (23).

10. The composite catheter according to claim 1, characterized in that: The traction assembly (4) comprises a traction wire (41), and a protective tube (42) is provided on the outside of the traction wire (41).