Delivery catheter and delivery system

Abstract

The embodiment of the utility model provides a conveying catheter and a conveying system. The conveying catheter has a spatial axial direction, and two axial ends of the conveying catheter are respectively a far end and a near end; the conveying catheter comprises a containing tube used for containing an implant, a guide tube and a reflection structure. The guide pipe is arranged in the cavity of the containing pipe and comprises a supporting pipe and a guide head located at the far end of the supporting pipe, and the guide head extends by a preset length from the far end of the containing pipe along the axial far end; the reflecting structure is arranged at the far end of the guiding head and / or the far end of the containing pipe and used for reflecting the ultrasonic waves. According to the delivery catheter and the delivery system provided by the invention, the reflection structure for reflecting the ultrasonic waves is arranged at the far end of the guide head and / or the far end of the accommodating tube, so that the area with the reflection structure and the area without the reflection structure can reflect the ultrasonic waves differently; therefore, ultrasonic development of the far end of the conveying catheter and the far end of the conveying system can be achieved.

Description

Technical Field

[0001] The present application relates to the technical field of medical devices, and more specifically, to a delivery catheter and a delivery system. Background Art

[0002] Since minimally invasive interventional treatment has the characteristics of small incision, less trauma, less bleeding, quick recovery and less pain, the surgical treatment of heart valve insufficiency or stenosis is mainly based on minimally invasive interventional treatment, that is, using the vein or artery as the entry route, and delivering the heart valve prosthesis to the corresponding valve ring position in the body through a delivery catheter.

[0003] The delivery catheter involved in minimally invasive interventional treatment is usually guided by digital subtraction angiography (DSA) to ensure that the delivery catheter delivers the heart valve prosthesis to the corresponding valve ring position in the body. DSA surgery requires the use of contrast agents, and some patients are allergic to contrast agents, so they are not suitable for minimally invasive interventional treatment.

[0004] For patients with heart valve insufficiency or stenosis, minimally invasive interventional treatment is usually chosen when surgical heart valve repair cannot be performed. If the patient is allergic to contrast agents, the patient's choice of treatment options will be greatly limited and the patient's chance of recovery will be greatly reduced. Utility Model Content

[0005] The present application provides a delivery catheter and a delivery system that can at least partially solve the above-mentioned problems existing in the related art or other problems in the art.

[0006] The first aspect of the present application provides a delivery catheter, which has an axial direction in space, and the two ends of the axial direction of the delivery catheter are respectively a distal end and a proximal end; the delivery catheter includes a receiving tube for accommodating an implant, a guide tube and a reflection structure; the guide tube is arranged in the cavity of the receiving tube, the guide tube includes a support tube and a guide head located at the distal end of the support tube, and the guide head extends from the distal end of the receiving tube along the axial direction to a predetermined length; the reflection structure is arranged at the distal end of the guide head and / or the distal end of the receiving tube, and is used to reflect ultrasonic waves.

[0007] In some embodiments, the guide head includes a first developing portion located at a distal end of the guide head, the first developing portion is hemispherical and is provided with a reflective structure.

[0008] In some embodiments, the reflective structure includes at least one groove, and the at least one groove is disposed on the outer wall surface of the first developing portion.

[0009] In some embodiments, the groove extends along the axial direction on the outer wall surface of the first developing portion and extends to the radial maximum position of the outer wall surface of the first developing portion.

[0010] In some embodiments, the reflective structure includes at least one linear developing unit, and the linear developing unit includes a plurality of grooves spaced apart in the axial direction.

[0011] In some embodiments, the reflective structure includes a plurality of linear developing units, and the plurality of linear developing units are arranged at intervals in a circumferential direction of the first developing portion.

[0012] In some embodiments, the receiving tube includes a second developing portion located at a distal end of the receiving tube, and the second developing portion is provided with a reflective structure.

[0013] In some embodiments, the tube wall of the second developing portion includes a first material layer and a second material layer arranged in sequence in the radial direction, the reflection coefficient of the first material layer and the reflection coefficient of the second material layer are different, and the reflective structure includes at least one through hole, and the at least one through hole is arranged on the first material layer or the second material layer.

[0014] In some embodiments, the tube wall of the second developing portion includes two first material layers and a second material layer located between the two first material layers, and at least one through hole is disposed on the second material layer.

[0015] In some embodiments, the reflective structure includes a plurality of through holes, and the plurality of through holes are arranged at intervals in the axial direction, or the plurality of through holes are arranged at intervals in the circumferential direction of the second developing portion.

[0016] In some embodiments, the reflective structure includes at least one developing wire, and the at least one developing wire is disposed on an outer wall surface of the second developing portion, and each developing wire extends along the axial direction.

[0017] In some embodiments, the developing filament is a structure made of a first medium, the second developing portion is a structure made of a second medium, and the reflection coefficient of the first medium is greater than the reflection coefficient of the second medium.

[0018] A second aspect of the present application provides a delivery system, which includes the delivery catheter as described in the first aspect of the present application and a control handle for connecting to the delivery catheter.

[0019] According to at least one embodiment of the present application, by providing a reflective structure for reflecting ultrasonic waves at the distal end of the guide head and / or the distal end of the receiving tube, a difference in reflection of ultrasonic waves can be formed between the area where the reflective structure is provided and the area where the reflective structure is not provided, thereby facilitating ultrasonic imaging of the distal end of the delivery catheter and the distal end of the delivery system. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Other features, objects and advantages of the present application will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings, in which:

[0021] Figure 1 is a schematic structural diagram of a delivery catheter according to an exemplary embodiment of the present application;

[0022] Figure 2 is a schematic structural diagram of a guide tube according to an exemplary embodiment of the present application;

[0023] Figure 3 for Figure 2 A top view of the guide tube shown;

[0024] Figure 4 is a schematic structural diagram of a guide tube according to an exemplary embodiment of the present application;

[0025] Figure 5 is a schematic structural diagram of a receiving tube according to an exemplary embodiment of the present application;

[0026] Figure 6 is a schematic structural diagram of a receiving tube according to an exemplary embodiment of the present application; and

[0027] Figure 7 It is a schematic structural diagram of a delivery catheter loaded with a valve prosthesis according to an exemplary embodiment of the present application. DETAILED DESCRIPTION

[0028] In order to better understand the present application, a more detailed description will be made of various aspects of the present application with reference to the accompanying drawings. It should be understood that these detailed descriptions are only descriptions of exemplary embodiments of the present application, and are not intended to limit the scope of the present application in any way. Throughout the specification, the same reference numerals refer to the same elements. The expression "and / or" includes any and all combinations of one or more of the associated listed items.

[0029] It should be noted that in this specification, the expressions first, second, etc. are only used to distinguish one feature from another feature, and do not represent any limitation on the features, especially do not represent any order of precedence. Therefore, without departing from the teaching of this application, the first developing unit discussed in this application may also be referred to as the second developing unit, and vice versa.

[0030] In the drawings, the thickness, size and shape of components have been slightly adjusted for ease of explanation. The drawings are only examples and are not drawn strictly to scale.

[0031] It should also be understood that expressions such as "including" and / or "having" in this specification are open rather than closed expressions, which indicate the presence of the stated features, elements and / or components, but do not exclude the presence of one or more other features, elements, components and / or their combinations. In addition, when describing the embodiments of the present application, the use of "may" means "one or more embodiments of the present application".

[0032] Unless otherwise specified, all words (including engineering terms and scientific and technological terms) used in this article have the same meaning as those commonly understood by ordinary technicians in the field to which this application belongs. It should also be understood that, unless clearly stated in this application, words defined in common dictionaries should be interpreted as having the same meaning as their meaning in the context of the relevant technology, and should not be interpreted in an idealized or overly formal sense.

[0033] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments in this application can be combined with each other. In addition, when "connected" is used in this application, it can indicate that the corresponding components are directly connected or indirectly connected, unless otherwise clearly defined or can be deduced from the context.

[0034] The first aspect of the present application provides a delivery catheter. The delivery catheter can be used to deliver implants, including but not limited to artificial heart valve prostheses (referred to as valve prostheses), to corresponding surgical locations in the body. The delivery catheter can have an axial direction in space, with the two axial ends of the delivery catheter being a distal end and a proximal end, respectively. In other words, the two axial ends of each component included in the delivery catheter correspond to a distal end and a proximal end, respectively.

[0035] refer to Figure 1 , Figure 2 , Figure 4 , Figure 5 and Figure 6 The delivery catheter 100 may include a receiving tube 110, a guide tube 120 and a reflective structure 130. The receiving tube 110 is used to receive an implant. The guide tube 120 may be arranged in the cavity of the receiving tube 110. The guide tube 120 may include a support tube 121 and a guide head 122 located at the distal end of the support tube 121, and the guide head 122 extends from the distal end of the receiving tube 110 along the axial distal end and extends out a predetermined length. The reflective structure 130 may be arranged at the distal end of the guide head 122 and / or the distal end of the receiving tube 110, and is used to reflect ultrasound.

[0036] The delivery catheter 100 provided in the present application, by setting a reflection structure 130 for reflecting ultrasound at the distal end of the guide head 122 and / or the distal end of the receiving tube 110, can make a difference in the reflection of ultrasound between the area where the reflection structure 130 is set and the area where the reflection structure 130 is not set, thereby facilitating ultrasonic imaging of the distal end of the delivery catheter 100, achieving precise positioning of the distal end of the delivery catheter 100, and reducing the surgical risks of interventional surgery.

[0037] In some embodiments, reference Figure 1The guide head 122 may have a streamlined shape structure, which is conducive to guiding the delivery catheter 100 to advance in the body. The outer size of the guide head 122 may be larger than the inner diameter of the receiving tube 110, and the guide head 122 may contact the distal end of the receiving tube 110.

[0038] In some embodiments, reference Figure 2 and Figure 4 The guide head 122 may include a first developing portion 123 located at the distal end of the guide head. The first developing portion 123 is hemispherical and is provided with a reflecting structure 130. The reflecting structure 130 may include at least one groove 131, and at least one groove 131 is provided on the outer wall surface of the first developing portion 123. The inner wall surface of the groove 131 may serve as a reflecting surface for concentratedly reflecting ultrasonic waves.

[0039] The first developing portion 123 has a first reflecting area and a second reflecting area, wherein the first reflecting area is an area provided with the groove 131, and the second reflecting area is an area not provided with the groove 131. By providing the groove 131, the ultrasonic wave reflecting surface of the first reflecting area can be increased, so that the first reflecting area and the second reflecting area have a difference in reflection of ultrasonic waves, for example, compared with the second reflecting area, the first reflecting area has a greater reflectivity to ultrasonic waves, thereby realizing ultrasonic development of the distal end of the delivery catheter 100.

[0040] In some embodiments, reference Figure 2 and Figure 3 The groove 131 extends along the axial direction on the outer wall surface of the first developing portion 123 and extends to the radial maximum position of the outer wall surface of the first developing portion 123. In the radial direction of the support tube, the groove 131 can extend from a position at a first distance from the support tube 121 to a position at a second distance from the support tube 121. The shape of the cross section of the groove 131 along the radial direction of the support tube can be one of V-shaped, arc-shaped or circular.

[0041] The number of the grooves 131 may be one or more. When the number of the grooves 131 is one, the groove 131 may be disposed on the side of the first developing portion 123 that requires ultrasonic development. When the number of the grooves 131 is multiple, the multiple grooves 131 may be disposed at intervals along the circumference of the first developing portion 130, and the shapes of the cross sections of different grooves 131 along the radial direction of the support tube may be the same or different.

[0042] In some embodiments, reference Figure 4The reflective structure 130 may include at least one linear developing unit, and the linear developing unit may include a plurality of grooves 131 spaced apart in the axial direction. The cross section of the groove 131 along the axial direction of the support tube may be a polygon, for example, the cross section of the groove 131 along the axial direction of the support tube may be a triangle or a quadrilateral. The shapes of the cross sections of different grooves 131 along the axial direction of the support tube may be the same or different.

[0043] The number of the linear developing units may be one or more. When the number of the linear developing units is one, the linear developing unit may be disposed on the side of the first developing section 123 where ultrasonic development is required. When the number of the linear developing units is multiple, the multiple linear developing units are arranged at intervals in the circumferential direction of the first developing section 130, and the number of grooves 131 included in different linear developing units may be the same or different.

[0044] In some embodiments, reference Figure 5 and Figure 6 The receiving tube 110 may include a second developing portion 111 located at the far end of the receiving tube, and the second developing portion 111 is provided with a reflective structure 130. The second developing portion 111 has a first reflective region and a second reflective region, the first reflective region is a region where the reflective structure 130 is provided, and the second reflective region is a region where the reflective structure 130 is not provided.

[0045] In some embodiments, reference Figure 5 , the tube wall of the second developing part 111 may include a first material layer 112 and a second material layer 113 arranged in sequence in the radial direction, and the reflection coefficient of the first material layer 112 and the reflection coefficient of the second material layer 113 are different. The reflective structure 130 may include at least one through hole 132, and at least one through hole 132 may be arranged on the first material layer 112 or on the second material layer 113. The cross section of the through hole 132 along the axial direction of the receiving tube may be a polygon, for example, the cross section of the through hole 132 along the axial direction of the receiving tube is a triangle or a quadrilateral. The shapes of the cross sections of different through holes 132 along the axial direction of the receiving tube may be the same or different.

[0046] As an example, the tube wall of the second developing part 111 may include two first material layers 112 and a second material layer 113 located between the two first material layers 112. At least one through hole 132 may be provided on the second material layer 113.

[0047] As an example, the number of through holes 132 may be one or more. When the number of through holes 132 is one, the through hole 132 may be provided on the side of the second developing portion 111 that requires ultrasonic development. When the number of through holes 132 is multiple, the multiple through holes 132 may be arranged at intervals in the circumferential direction of the second developing portion 111. Alternatively, when the number of through holes 132 is multiple, the multiple through holes 132 are arranged at intervals in the axial direction and are all provided on the side of the second developing portion 111 that requires ultrasonic development.

[0048] By setting the through hole 132 on the first material layer 112 or the second material layer 113, a density difference can be formed between the materials of the first reflection area and the second reflection area, which further makes the first reflection area and the second reflection area reflect ultrasound differently. For example, compared with the second reflection area, the first reflection area has a greater reflectivity to ultrasound, thereby realizing ultrasonic imaging of the distal end of the delivery catheter 100.

[0049] In some embodiments, reference Figure 6 The reflective structure 130 may include at least one developing wire 133, at least one developing wire 133 is arranged on the outer wall surface of the second developing portion 111, and each developing wire 133 may extend along the axial direction. The developing wire 133 may be a structure made of a first medium, the second developing portion 111 may be a structure made of a second medium, and the reflection coefficient of the first medium is greater than the reflection coefficient of the second medium. The first medium may be, for example, tantalum, platinum-iridium alloy, or tungsten. The second medium may be, for example, one or more of stainless steel, nickel-titanium alloy, polyurethane, polyethylene, or polyvinyl chloride.

[0050] By setting the developing wire 133, a density difference can be formed between the materials of the first reflecting area and the second reflecting area, which further makes the first reflecting area and the second reflecting area reflect ultrasound differently. For example, compared with the second reflecting area, the first reflecting area has a greater reflectivity to ultrasound, thereby realizing ultrasonic development of the distal end of the delivery catheter 100.

[0051] In some embodiments, the reflective structure 130 may include a first reflective structure and a second reflective structure, the first reflective structure may be disposed at the distal end of the guide head 122, and the second reflective structure may be disposed at the distal end of the receiving tube 110. The first reflective structure may include at least one groove 131. The second reflective structure may include at least one through hole 132 disposed on the first material layer 112 or the second material layer 113, or the second reflective structure may include at least one developing wire 133. The structures and positional relationships of the groove 131, the through hole 132, and the developing wire 133 have been described in detail above, and will not be repeated in this application.

[0052] By simultaneously providing a reflective structure at the distal end of the guide head 122 and the distal end of the receiving tube 110 , the reflectivity of the distal end of the delivery catheter 100 to ultrasound waves can be further increased, which is more conducive to realizing ultrasonic imaging of the distal end of the delivery catheter 100 .

[0053] In some embodiments, the implant may include but is not limited to a valve prosthesis. The following description will be given by taking a valve prosthesis as an example. Figure 7 The support tube 121 may include a main body and a bearing portion located at the distal end of the main body. The guide head 122 is located at the distal end of the bearing portion. The guide head 122, the bearing portion and the receiving tube 110 together define a space for accommodating a valve prosthesis, and the valve prosthesis can be accommodated in the above space. Since the outer size of the guide head 122 is larger than the inner diameter of the receiving tube 110, the space defined by the guide head 122, the bearing portion and the receiving tube 110 can be a closed space, thereby ensuring that the valve prosthesis is always in a sealed state during the transportation process.

[0054] It should be pointed out that the valve prosthesis has a relative release state and a compression state. The compression state refers to the state in which the valve prosthesis is radially compressed and loaded on the load-bearing portion and wrapped by the containing tube 110; the release state refers to the state after production and before loading, or the free state after being in place in the body (without considering the forces of surrounding tissues).

[0055] In some embodiments, reference Figure 7 The delivery catheter 100 may further include a connecting tube 140 and a fixing seat 150. The connecting tube 140 may be sleeved in the radial gap between the main body and the receiving tube 110. The distal end of the fixing seat 150 is used to connect the valve prosthesis and accommodate the valve prosthesis in the space defined by the guide head 122, the bearing portion and the receiving tube 110.

[0056] In some embodiments, reference Figure 7 The peripheral dimensions of the fixing seat 150 may be limited by the valve prosthesis and the receiving tube 110. For example, the peripheral dimensions of the fixing seat 150 are configured to allow the fixing seat 150 to have sufficient structural strength so as to be able to carry the valve prosthesis. At the same time, the peripheral dimensions of the fixing seat 150 need to be smaller than the peripheral dimensions of the valve prosthesis to ensure that the outer wall surface of the fixing seat 150 and the inner wall surface of the receiving tube 110 have a certain radial spacing.

[0057] In some embodiments, the receiving tube 110 and the connecting tube 140 can also be configured as follows: the connecting tube 140 is fixed, and the receiving tube 110 moves relative to the connecting tube 140 in the axial direction. When the delivery catheter 100 delivers the valve prosthesis to the target position (for example, the corresponding valve ring position in the body), the receiving tube 110 is driven to move in the axial direction toward the axial proximal end, and the valve prosthesis begins to be released until the valve prosthesis is completely released and detached from the delivery catheter 100, thereby achieving the release of the valve prosthesis. When the valve prosthesis is loaded using the delivery catheter 100, the distal end of the receiving tube 110 is located at the rear side of the distal end of the connecting tube 140, exposing the fixing seat 150, and then the valve prosthesis is installed on the fixing seat 150, and the receiving tube 110 is driven to move in the axial direction toward the axial distal end until the receiving tube 110 completely wraps the valve prosthesis, thereby achieving the loading of the valve prosthesis.

[0058] In some embodiments, the receiving tube 110, the guide tube 120, and the connecting tube 140 may also be configured such that the connecting tube 140, the guide tube 120, and the receiving tube 110 all move in the axial direction. During the delivery of the valve prosthesis, by making the receiving tube 110, the guide tube 120, and the connecting tube 140 move together in the axial direction, it is ensured that the valve prosthesis is always wrapped by the receiving tube 110 before being delivered to the target position (e.g., the corresponding valve ring position in the body).

[0059] In some embodiments, reference Figure 7 The delivery catheter 100 may also include a bending adjustment tube 160 sleeved on the periphery of the connecting tube 140. The bending adjustment tube 160 may be sleeved in the radial gap between the connecting tube 140 and the receiving tube 110 and located on the proximal side close to the fixing seat 150. The distal end of the bending adjustment tube 160 may be bent relative to the proximal end of the bending adjustment tube 160, thereby driving the distal ends of the connecting tube 140, the guide tube 120 and the receiving tube 110 to bend. The bending adjustment tube 160 may be a serpentine tube, which includes a plurality of serpentine tube units, and adjacent serpentine tube units are connected by a connecting structure. By driving the distal ends of the connecting tube 140, the guide tube 120 and the receiving tube 110 to bend using the bending adjustment tube 160, the valve prosthesis can be delivered to the target position (for example, the corresponding valve ring position in the body).

[0060] The delivery catheter 100 is described below in conjunction with the loading process and the release process of the valve prosthesis.

[0061] Taking the loading process of the valve prosthesis as an example, first, the containing tube 110 is driven to move axially toward the axial proximal end until the distal end of the containing tube 110 is located on the axial proximal side of the distal end of the connecting tube 140 and the fixing seat 150 is exposed; then, the valve prosthesis is installed on the fixing seat 150, and the containing tube 110 is driven to move axially toward the axial distal end until the containing tube 110 completely wraps the valve prosthesis, thereby achieving the loading of the valve prosthesis.

[0062] Taking the release process of the valve prosthesis as an example, first, the connecting tube 140, the guide tube 120 and the receiving tube 110 are driven to move together in the axial direction until the valve prosthesis reaches the vicinity of the target position (for example, the corresponding valve ring position in the body); after the valve prosthesis reaches the vicinity of the target position, the bending tube 160 is used to drive the distal ends of the connecting tube 140, the guide tube 120 and the receiving tube 110 to bend until the valve prosthesis reaches the target position (for example, the corresponding valve ring position in the body); then, the receiving tube 110 is driven to move in the axial direction toward the axial proximal end to start releasing the valve prosthesis until the valve prosthesis is completely released and detached from the delivery catheter 100, thereby achieving the release of the valve prosthesis.

[0063] Since the distal end of the guide head 122 and / or the distal end of the receiving tube 110 is provided with a reflective structure 130, and there is a difference in the reflection of ultrasound between the area provided with the reflective structure 130 and the area not provided with the reflective structure 130, the reflective structure 130 can be used to observe the position of the distal end of the delivery catheter 100 under ultrasound, thereby achieving precise positioning of the distal end of the delivery catheter 100.

[0064] The second aspect of the present application provides a delivery system, which includes the delivery catheter 100 of the first aspect of the present application, and a control handle connected to the proximal end of the delivery catheter 100. By controlling the control handle, the delivery catheter 100 can achieve at least one of the following conditions: the connecting tube 140 is fixed, and the receiving tube 110 moves axially relative to the connecting tube 140; the connecting tube 140, the guide tube 120 and the receiving tube 110 all move axially; the distal end of the bending adjustment tube 160 is bent relative to the proximal end of the bending adjustment tube 160.

[0065] The above description is only an implementation method of the present application and an explanation of the technical principles used. Those skilled in the art should understand that the scope of protection involved in the present application is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the technical concept. For example, the above features are replaced with the technical features with similar functions disclosed in this application (but not limited to) by each other to form a technical solution.

Claims

1. A delivery catheter having an axial direction in space, wherein the two ends of the axial direction of the delivery catheter are respectively a distal end and a proximal end, characterized in that: The delivery catheter comprises: A receiving tube for receiving an implant; a guide tube, arranged in the cavity of the receiving tube, the guide tube comprising a support tube and a guide head located at the distal end of the support tube, the guide head extending axially from the distal end of the receiving tube to a predetermined length; and The reflection structure is arranged at the distal end of the guide head and / or the distal end of the receiving tube and is used for reflecting ultrasonic waves.

2. The delivery catheter according to claim 1, characterized in that: The guide head comprises a first developing portion located at the far end of the guide head, the first developing portion is hemispherical and is provided with the reflective structure.

3. The delivery catheter according to claim 2, characterized in that: The reflective structure includes at least one groove, and the at least one groove is arranged on the outer wall surface of the first developing part.

4. The delivery catheter according to claim 3, characterized in that: The groove extends along the axial direction on the outer wall surface of the first developing portion and extends to the radial maximum position of the outer wall surface of the first developing portion.

5. The delivery catheter according to claim 3, characterized in that: The reflection structure includes at least one line-type developing unit, and the line-type developing unit includes a plurality of the grooves arranged at intervals in an axial direction.

6. The delivery catheter according to claim 5, characterized in that: The reflection structure includes a plurality of the line-type developing units, and the plurality of the line-type developing units are arranged at intervals in a circumferential direction of the first developing portion.

7. The delivery catheter according to claim 1, characterized in that: The receiving tube comprises a second developing portion located at a distal end of the receiving tube, and the second developing portion is provided with the reflecting structure.

8. The delivery catheter according to claim 7, characterized in that: The tube wall of the second developing part includes a first material layer and a second material layer arranged in sequence in the radial direction, the reflection coefficient of the first material layer is different from the reflection coefficient of the second material layer, and the reflection structure includes at least one through hole, and the at least one through hole is arranged on the first material layer or the second material layer.

9. The delivery catheter according to claim 8, characterized in that: The tube wall of the second developing portion includes two first material layers and a second material layer located between the two first material layers, and the at least one through hole is arranged on the second material layer.

10. The delivery catheter according to claim 8, characterized in that: The reflective structure includes a plurality of through holes, and the plurality of through holes are arranged at intervals in the axial direction, or the plurality of through holes are arranged at intervals in the circumferential direction of the second developing portion.

11. The delivery catheter according to claim 7, characterized in that: The reflective structure includes at least one developing wire, and the at least one developing wire is arranged on the outer wall surface of the second developing portion, and each of the developing wires extends along the axial direction.

12. The delivery catheter according to claim 11, characterized in that: The developing wire is a structure made of a first medium, the second developing part is a structure made of a second medium, and the reflection coefficient of the first medium is greater than the reflection coefficient of the second medium.

13. A conveying system, characterized in that: It comprises a delivery catheter as described in any one of claims 1 to 12, and a control handle connected to the delivery catheter.

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