Conveying system

Abstract

This invention relates to a medical device delivery system, comprising a delivery sheath, a loader, and a steel cable. The loader is used to load the medical device and is connected to the delivery sheath and located at the proximal end of the delivery sheath. The steel cable is detachably connected to the medical device and can push the medical device from the loader into the delivery sheath. The delivery system of the same size is used to transport medical devices of different sizes. Multiple marking portions are axially arranged sequentially near the proximal end of the steel cable. The loader is provided with a reference portion. Each marking portion is used to mark a medical device of a different size. When one of the marking portions coincides with the reference portion, the medical device corresponding to the marking portion is transported to the release position via the loader and the delivery sheath, thereby reducing manufacturing difficulty and cost.

Description

Technical Field

[0001] This invention relates to the field of interventional medical device technology, and more particularly to a delivery system. Background Technology

[0002] Catheter-based interventional treatment of cardiovascular diseases is a common approach. Specifically, it involves placing various materials and instruments through catheters into the heart, arteries, and veins to treat cardiovascular conditions.

[0003] For example, interventional medical devices such as atrial septal defect (ASD) occluders, ventricular septal defect (VSD) occluders, patent ductus arteriosus (PDA) occluders, patent foramen ovale (PFO) occluders, left atrial appendage occluders, and vascular plugs are placed through catheter-based interventional methods to reach the lesion site in the heart or blood vessels and achieve the therapeutic effect.

[0004] Existing delivery systems include a loader, hemostatic valve, delivery sheath, and delivery cable. The interventional medical device is compressed and placed into the loader. When delivering the device to the treatment site via the delivery system, the loader needs to be connected to the delivery sheath. The delivery cable pushes the interventional medical device from the loader into the delivery sheath, and then releases it from the distal end of the sheath to reach the lesion site. In existing delivery systems, one size of medical device corresponds to one size of delivery sheath and delivery cable. This means that one size of medical device is delivered by a corresponding size of delivery sheath and cable, requiring multiple sizes of delivery sheaths and cables to be manufactured, resulting in high costs. Furthermore, if the size of the medical device inserted into the body is unsuitable during surgery, it needs to be withdrawn and a new size device inserted. This also requires withdrawing the delivery sheath, making the entire process very cumbersome and potentially causing injury and pain to the patient. Additionally, the entire surgery is performed under DSA imaging, exposing both the patient and the doctor to radiation, posing significant health risks. Summary of the Invention

[0005] In view of the above problems, the present invention aims to provide at least one delivery system that can reduce manufacturing difficulty and cost and reduce the radiation dose received.

[0006] This objective is achieved through the following technical solutions:

[0007] According to the technical solution of the present invention, a medical device delivery system is proposed, comprising a delivery sheath, a loader, and a steel cable. The loader is used to load the medical device and is connected to the delivery sheath and located on the proximal side of the delivery sheath. The steel cable is detachably connected to the medical device and can push the medical device from the loader into the delivery sheath. The delivery system of the same size is used to transport medical devices of different sizes. A plurality of marking portions are axially arranged sequentially near the proximal end of the steel cable. The loader is provided with a reference portion. Each marking portion is used to mark medical devices of different sizes. When one of the marking portions coincides with the reference portion, the medical device corresponding to the marking portion is transported to the release position via the loader and the delivery sheath.

[0008] The aforementioned delivery system, through the cooperation of markings on the steel cable and references on the loader, reduces or eliminates the use of DSA imaging before the medical device reaches its release position, thereby reducing the observation time under DSA imaging and the radiation dose received. When medical devices of different sizes are transported using the same delivery system, the axial length of the compressed medical devices varies, and the distance the steel cable needs to be pushed to the distal end also varies. Multiple markings are sequentially arranged axially near the proximal end of the steel cable to indicate the release position of medical devices of different sizes. This allows for the manufacture of a single delivery system of one size, enabling the transport of different sizes of medical devices using this single system, reducing manufacturing difficulty and cost. Meanwhile, during the surgery, if the size of the medical device inserted into the body is not suitable, it needs to be withdrawn and a new size medical device needs to be inserted into the body. At this time, it is not necessary to withdraw the delivery sheath at the same time. Keep the delivery sheath stationary. Only the steel cable needs to be withdrawn, the unsuitable medical device at the distal end of the steel cable needs to be released, and the new medical device can be installed on the distal end of the steel cable and inserted into the original delivery sheath. This can make the surgical operation more convenient, shorten the operation time, and reduce the patient's pain.

[0009] Furthermore, the loader includes a loading tube, and the reference part is a mark provided on the proximal end of the loading tube; or, a window structure is provided on the loading tube, and the window structure is the reference part; or, the proximal end of the loading tube is the reference part; or, the proximal end of the loading tube is connected to the reference part.

[0010] Furthermore, the loader includes a loading tube, the loading tube includes a transparent tube body, and the reference portion is provided on the loading tube.

[0011] Furthermore, the loader also includes a loader hemostatic valve, which is connected to the proximal end of the loading tube, and the proximal end of the loader hemostatic valve is the reference portion; or, the reference portion is a mark provided on the proximal end of the loader hemostatic valve; or, the proximal end of the loader hemostatic valve is connected to the reference portion.

[0012] Furthermore, the steel cable includes a first part and a second part that are interconnected from the near end to the far end, wherein the second part is a braided structure and the first part is a rod-shaped structure.

[0013] Furthermore, the delivery sheath includes a tube base and a tube body connected to each other. The tube base has a first channel and a second channel that communicate with each other from the proximal end to the distal end. The tube body is connected to the second channel. The loader includes a loading tube. The outer diameter of the loading tube is less than or equal to the inner diameter of the first channel. A connecting channel is provided between the first channel and the second channel. The first channel, the connecting channel, and the second channel are connected sequentially. From the proximal end to the distal end, the inner diameter of the connecting channel gradually decreases. The outer diameter of the loading tube is at least greater than the inner diameter of the distal end of the connecting channel. The loading tube is inserted into or can be inserted into the first channel. The distal end of the loading tube abuts against the inner wall of the connecting channel to maintain fixation.

[0014] Furthermore, the inner diameter of the connecting channel gradually decreases from the proximal end to the distal end, and the inner diameter of the distal end of the connecting channel is the same as the inner diameter of the second channel or the inner diameter of the tube; or, the inner diameter of the distal end of the connecting channel is smaller than the inner diameter of the second channel or the inner diameter of the tube.

[0015] Furthermore, the connecting channel has an inner surface with a curved structure, and the connecting channel is connected to the second channel or the tube body by an arc transition.

[0016] Furthermore, the inner diameter of the connecting channel decreases and then increases from the proximal end to the distal end. The connecting channel has a proximal portion and a distal portion that are connected to each other. In the cross-section along the axial direction of the connecting channel, the curvature of the proximal portion of the curved surface structure of the connecting channel is less than the curvature of the distal portion.

[0017] Furthermore, the proximal end of the tube is located in the middle or proximal end of the second channel. Attached Figure Description

[0018] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0019] Figure 1 This is a schematic diagram of the conveying system in one embodiment.

[0020] Figure 2 for Figure 1 A cross-sectional view of the conveyor system along its axial direction.

[0021] Figure 3 for Figure 1 A schematic cross-sectional view of the transport sheath along its axial direction.

[0022] Figure 4 for Figure 1 A cross-sectional view of a medium-elastic seal along its axial direction.

[0023] Figure 5 This is a schematic diagram of the structure of the elastic seal in another embodiment.

[0024] Figure 6 This is a cross-sectional view of the conveying system along the axial direction in another embodiment.

[0025] Figure 7 This is a schematic diagram of the structure of the delivery system, the steel cable, and the medical device when the medical device is pushed to the release position by the steel cable in one embodiment.

[0026] Figure 8 for Figure 7 A magnified structural diagram of A in the diagram.

[0027] Figure 9 This is a schematic diagram of the structure of the delivery system, the steel cable, and the medical device when the medical device is pushed to the release position by the steel cable in one embodiment. Detailed Implementation

[0028] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

[0029] It should be understood that the terminology used herein is for the purpose of describing particular exemplary embodiments only and is not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms “a,” “an,” and “described” as used herein may also include the plural forms. The terms “comprising,” “including,” “containing,” and “having” are inclusive and therefore indicate the presence of the stated features, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein are not construed as requiring them to be performed in a particular order described or illustrated unless the order of performance is explicitly indicated. It should also be understood that additional or alternative steps may be used.

[0030] Although terms such as first, second, third, etc., may be used in this document to describe multiple elements, components, regions, layers, and / or segments, these elements, components, regions, layers, and / or segments should not be limited by these terms. These terms may be used only to distinguish one element, component, region, layer, or segment from another. Unless the context clearly indicates otherwise, terms such as "first," "second," and other numerical terms used herein do not imply order or sequence. Therefore, the first element, component, region, layer, or segment discussed below may be referred to as the second element, component, region, layer, or segment without departing from the teachings of the exemplary embodiments.

[0031] For ease of description, spatial relative terms may be used in the text to describe the relationship of one element or feature relative to another element or feature, as shown in the figure. These relative terms include, for example, "inside," "outside," "middle," "outer," "below," "below," "above," "over," etc. Such spatial relative terms are intended to include different orientations of the device in use or operation, other than those depicted in the figure. For example, if the device in the figure is flipped, an element described as "below other elements or features" or "below other elements or features" would subsequently be oriented as "above other elements or features" or "above other elements or features." Therefore, the example term "below" can include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions), and the spatial relative descriptors used in the text will be interpreted accordingly.

[0032] It should be noted that the terms "distal" and "proximal" are used as directional terms, which are commonly used in the field of interventional medical devices. "Distal" refers to the end furthest from the operator during the procedure, while "proximal" refers to the end closest to the operator. Axial direction refers to the direction parallel to the line connecting the center of the distal and proximal ends of the medical device; radial direction refers to the direction perpendicular to the aforementioned axial direction.

[0033] Combination Figure 1 and Figure 2 As shown, an embodiment of the present invention provides a medical device delivery system 100. The medical device can be an atrial septal defect occluder, a ventricular septal defect occluder, a patent ductus arteriosus occluder, a patent foramen ovale occluder, a left atrial appendage occluder, a vascular plug, a filter, or other medical devices that can be delivered by the delivery system 100.

[0034] Combination Figures 1 to 3 The delivery system 100 includes a delivery sheath 1 and a loading tube 2. The loading tube 2 is used to load the medical device 200 (see...). Figure 7 The loading tube 2 includes an insertion section 2a located at its distal end. The delivery sheath 1 includes a tube seat 10 and a tube body 11 connected to each other. The tube seat 10 has a first channel 101 and a second channel 102 that are connected from the proximal end to the distal end. The tube body 11 is connected to the second channel 102. The maximum outer diameter of the insertion section 2a is less than or equal to the minimum inner diameter of the first channel 101. A connecting channel 103 is provided between the first channel 101 and the second channel 102. The first channel 101, the connecting channel 103, and the second channel 102 are connected in sequence. The distal outer diameter of the insertion section 2a is at least greater than the distal inner diameter of the connecting channel 103, such that when at least the insertion section 2a is fixedly or detachably inserted into the connecting channel 103 via the first channel 101, the distal end of the insertion section 2a can abut against the inner wall of the connecting channel 103.

[0035] By setting the insertion section 2a of the loading tube 2 to be fixedly or detachably inserted into the connecting channel 103 through the first channel 101, the distal end of the insertion section 2a can abut against the inner wall of the connecting channel 103, thereby fixing the loading tube 2 in the tube seat 10, which makes it easier to push the medical device in the loading tube 2 later.

[0036] See Figure 3 The proximal end of the tube body 11 can be located in the middle of the second channel 102. Here, "middle" is understood as a position on the tube body 11 that is neither proximal nor distal. The inner diameter of the tube body 11 is the same as the inner diameter of the second channel 102, allowing for a smooth transition between the medical device and the second channel 102. The tube body 11 and the tube seat 10 are connected by adhesive bonding or injection molding. Furthermore, a fixing structure, such as a flared opening, is provided at the proximal end of the tube body 11. This fixing structure is inserted into the tube seat 10 to achieve a more stable connection between the tube body 11 and the tube seat 10. In other embodiments, the proximal end of the tube body 11 can also be located at the proximal end of the second channel 102, allowing the proximal end of the tube body 11 to be directly connected to the distal end of the connecting channel 103.

[0037] In this embodiment, the inner diameter of the connecting channel 103 gradually decreases from the proximal end to the distal end. This configuration allows for a larger tolerance range between the inner diameter of the loading tube 2 and the inner diameter of the second channel 102 or tube body 11, enabling the medical device to safely and smoothly transition from the loading tube 2 into the second channel 102 or tube body 11. This meets product design requirements, reduces manufacturing difficulty, and avoids damage to the medical device 200, ensuring safe delivery. Furthermore, the inner diameter of the distal end of the connecting channel 103 is the same as the inner diameter of the second channel 102 or tube body 11, allowing for a smooth connection between the connecting channel 103 and the second channel 102 or tube body 11, facilitating the smooth entry of the medical device 200 from the loading tube 2 into the second channel 102 or tube body 11. In this case, the inner diameter of at least the proximal end of the second channel 102 (or tube body 11) is larger than the inner diameter of at least the distal end of the first channel 101.

[0038] In other embodiments, the inner diameter of the distal end of the connecting channel 103 can be smaller than the inner diameter of the second channel 102 or the tube 11, allowing the medical device 200 in the loading tube 2 to smoothly move from the smaller inner diameter space into the larger inner diameter space. It is understood that to achieve the effect of the inner diameter of the distal end of the connecting channel 103 being smaller than the inner diameter of the second channel 102 or the tube 11, the wall thickness of the connecting channel 103 can be increased, or components of a certain thickness can be attached to the inner wall of the connecting channel 103. In this case, the inner diameter of the first channel 101 can be greater than, equal to, or less than the inner diameter of the second channel 102 (or the tube 11).

[0039] In one embodiment, the inner surface of the connecting channel 103 has a curved structure. Furthermore, the connecting channel 103 and the second channel 102 (or tube body 11) can be connected by an arc transition. The medical device 200 in the loading tube 2 can smoothly transition into the second channel 102 (or tube body 11) along the aforementioned curved structure and / or arc, allowing for a larger tolerance range between the inner diameter of the loading tube 2 and the inner diameter of the second channel 102 or tube body 11. This meets product design requirements, reduces processing difficulty, avoids damage to the medical device 200, and ensures safe delivery.

[0040] Furthermore, the inner diameter of the connecting channel 103 decreases and then increases from the proximal end to the distal end. The connecting channel 103 has a proximal portion and a distal portion that are interconnected. In the cross-section along the axial direction of the connecting channel 103, the curvature of the proximal portion of the curved structure of the connecting channel 103 is less than the curvature of the distal portion. Understandably, a smaller curvature in the proximal portion, meaning a smaller arc of the curve, facilitates the insertion of the distal end of the loading tube 2 into the connecting channel 103; a larger curvature in the distal portion, meaning a larger arc of the curve, allows the medical device 200 within the loading tube 2 to enter the second channel 102 (or tube body 11) more smoothly and evenly.

[0041] In this embodiment, the delivery system 100 further includes a hemostatic valve 20, which includes a valve seat, an elastic seal 21, and a squeezing member 22. The valve seat is a tube seat 10, the elastic seal 21 is disposed inside the valve seat, the elastic seal 21 is located at the proximal end of the first channel 101, the elastic seal 21 has an open state and a closed state, and the squeezing member 22 is disposed on the valve seat. The squeezing member 22 is used to squeeze or release the elastic seal 21, so that the elastic seal 21 can switch between the open state and the closed state.

[0042] The extrusion member 22 has a hollow structure, and an opening 23 is provided at the proximal end of the valve seat. The extrusion member 22 is connected to the valve seat through the opening 23. The hollow structure of the extrusion member 22, the elastic seal 21, the first channel 101, the connecting channel 103, and the second channel 102 are sequentially and continuously arranged to form a straight channel. This straight channel is used to deliver the medical device, thereby enabling the medical device to be delivered smoothly and safely into the body. The extrusion member 22 is connected to the valve seat by threads. The degree to which the elastic seal 21 is opened is adjusted by rotating the extrusion member 22 to squeeze or loosen it; and / or, the extrusion member 22 is connected to the valve seat by snap-fit.

[0043] Specifically, the extruder 22 has an inner extrusion structure 220 and an outer control structure 221 that are interconnected. The inner extrusion structure 220 is used to extrude the elastic seal 21, and the hollow structure of the extruder 22 extends through the interior of the inner extrusion structure 220. The outer control structure 221 is used for operation; by operating the outer control structure 221, the inner extrusion structure 220 is driven to extrude. A slot 222 is provided between the inner extrusion structure 220 and the outer control structure 221. The inner wall of the outer control structure 221 is provided with a first thread structure 2210, and the outer wall of the valve seat is provided with a second thread structure 2211 that cooperates with the first thread structure 2210. The outer wall of the valve seat enters the slot 222, so that the first thread structure 2210 and the second thread structure 2211 cooperate with each other, causing the extruder 22 to move axially, thereby realizing the extrusion or release of the elastic seal 21 by rotating the extruder 22.

[0044] The distal end of the insertion section 2a of the loading tube 2 enters the elastic seal 21 through the hollow structure of the extrusion member 22 and passes through the elastic seal 21. The outer control structure 221 drives the inner extrusion structure 220 to extrude the elastic seal 21. The elastic seal 21 tightly wraps the outer periphery of the insertion section 2a, thereby fixing the loading tube 2 to provide support and facilitate pushing the medical device in the loading tube 2 into the body.

[0045] See Figure 4 The elastic seal 21 can be made of rubber or silicone. The elastic seal 21 has an annular structure and a through-hole 210 penetrating its proximal and distal ends. This annular elastic seal 21 is open before being compressed. The through-hole 210 includes a middle portion 211 and two ends 212. The inner diameter of the middle portion 211 is smaller than the inner diameter of the two ends 212, facilitating faster and more efficient compression of the elastic seal 21 by the extruder 22, thus improving sealing efficiency. Furthermore, when the loading tube 2 is inserted into the elastic seal 21, the middle portion 211 of the through-hole 210 better conforms to the outer circumference of the loading tube 2, improving sealing efficiency and maintaining the loading tube 2 in a centered position for smoother delivery of the medical device within the loading tube 2.

[0046] Furthermore, combined Figure 3 and Figure 4 The elastic seal 21 has a first step structure 213 at both ends, and a second step structure 214 that mates with the first step structure 213 is provided in both the valve seat and the inner extrusion structure 220 of the extruder 22, so that the elastic seal 21 can be better fixed between the valve seat and the extruder 22. In other embodiments, the first step structure 213 is provided at either end of the elastic seal 21, and a second step structure 214 that mates with the first step structure 213 is provided in either the valve seat or the inner extrusion structure 220 of the extruder 22.

[0047] In another embodiment, see Figure 5 The elastic seal 21 can also be a sheet-like or columnar structure, and the elastic seal 21 has a slit 214 penetrating its proximal and distal ends. The sheet-like or columnar elastic seal 21 is in a closed state before being compressed. The inner compression structure 220 of the compression member 22 compresses the elastic seal 21 distally, thereby passing through the slit 214, thus opening the elastic seal 21.

[0048] In this embodiment, the tube seat 10 is a valve seat, and the hemostatic valve 20 and the tube body 11 are an integral structure, which can reduce the connection and disassembly steps of the tube body 11 and the hemostatic valve 20, thereby shortening the operation time.

[0049] See again Figure 2A handle 201 is provided near the distal end of the loading tube 2. The handle 210 is sleeved on the outer surface of the loading tube 2 for easy hand operation. The handle 201 may have a threaded structure, and the valve seat of the hemostatic valve 20 has a threaded structure that mates with it, thereby connecting the handle 210 to the hemostatic valve 20. In another embodiment, see... Figure 6 The handheld part 201 may not have a threaded structure. A hemostatic valve 202 may also be provided at the proximal end of the loading tube 2, and the structure of the hemostatic valve 202 may be the same as that of the hemostatic valve 20.

[0050] See Figure 7 The delivery system 100 also includes a steel cable 3, which is detachably connected to the medical device 200. After the steel cable 3 pushes the medical device 200 from the loading tube 2 into the tube body 11, it is pushed out from the far end of the tube body 11.

[0051] Combination Figure 2 and Figure 7 The steel cable 3 can push the medical device 200 from the loading tube 2 into the second channel 102 and the tube body 11 in sequence, and then push it out from the distal end of the tube body 11. In other embodiments, when the proximal end of the tube body 11 is located at the proximal end of the second channel 102, the steel cable 3 can push the medical device 200 from the loading tube 2 into the tube body 11 and then push it out from the distal end of the tube body 11.

[0052] See Figure 1 and Figure 2 The loader 300 is connected to and located proximally to the delivery sheath 1. The loader 300 includes a loading tube 2 and a loader hemostatic valve 202, which is connected to the proximal end of the loading tube 2. The loader 300 is at least partially insertable into the delivery sheath 1, and the loader hemostatic valve 202 is located proximally to the delivery sheath 1. In other embodiments, the loader 300 may not include the loader hemostatic valve 202.

[0053] See Figure 8A marking portion 31 is provided near the proximal end of the steel cable 3, and a reference portion 203 is provided on the loader 300. In this embodiment, the proximal end of the loader's hemostatic valve 202 is the reference portion 203. When the marking portion 31 coincides with the reference portion 203, the medical device 200 is transported to the release position via the loader 300 and the delivery sheath 1. This design reduces or eliminates the use of DSA imaging before the medical device 200 reaches the release position, thereby reducing the observation time under DSA imaging and the radiation dose received. The release position refers to the point where the distal end of the compressed medical device 200 has reached the distal end of the tube 11, and the next step is to release it from the distal end of the tube 11. In other embodiments, the reference portion 203 is a mark provided on the proximal end of the loader's hemostatic valve 202, such as a mark drawn or engraved on the proximal end of the loader's hemostatic valve 202; or, the proximal end of the loader's hemostatic valve 202 is connected to the reference portion 203, such as a connecting marking element.

[0054] In other embodiments, the loader 300 does not include the loader hemostatic valve 202. The reference portion 203 may be a mark provided on the proximal end of the loading tube 2; or, a window structure may be provided on the loading tube 2, which is the reference portion 203; or, the proximal end of the loading tube 2 is connected to the reference portion 203; or, the proximal end of the loading tube 2 is the reference portion 203; or, the loading tube 2 includes a transparent tube body, and the reference portion 203 is provided on the loading tube 2.

[0055] To reduce manufacturing complexity and cost, a single-size delivery system can be manufactured, allowing for the transport of medical instruments of different sizes. Furthermore, during surgery, if an inserted medical instrument is the wrong size and needs to be withdrawn, a new instrument can be delivered without simultaneously removing the delivery sheath. Instead, the sheath is kept stationary; only the cable needs to be removed, the unsuitable instrument at the distal end of the cable is disconnected, and the new instrument is installed and placed into the original delivery sheath. This simplifies surgical procedures, shortens operation time, and reduces patient discomfort.

[0056] In one embodiment, see Figure 9 A plurality of marking portions 31 are sequentially arranged axially near the proximal end of the steel cable 3. A reference portion 203 is provided on the loader 300. Each marking portion 31 is used to mark medical devices 200 of different sizes. When one marking portion 31 coincides with the reference portion 203, the medical device 200 corresponding to that marking portion 31 is transported to the release position. In this embodiment, the proximal end of the loader hemostatic valve 202 is the reference portion 203. In other embodiments, the setting method of the reference portion 203 is the same as that in the above embodiment, and will not be described again here.

[0057] Specifically, when medical devices 200 of different sizes are transported using the same transport system 100, the axial length of the medical devices 200 after compression is different, and the distance that the steel cable 3 needs to be pushed to the far end is also different. Multiple marking parts 31 are arranged axially near the proximal end of the steel cable 3 to indicate the release position of the medical devices 200 of different sizes.

[0058] See again Figure 8 The steel cable 3 includes a first part 32 and a second part 33 connected to each other from the proximal end to the distal end. The first part 32 and the second part 33 are connected by welding or adhesive bonding, with 34 being the welding point. The second part 33 has a braided structure, which has better bending performance and facilitates the delivery of the medical device 200 to different angles within the body. The first part 32 has a rod-like structure, which has better support performance, provides better mechanical properties, ensures force transmission, and is easier to control. A marking part 31 is provided on the first part 32.

[0059] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A delivery system for a medical device, comprising a delivery sheath, a loader, and a steel cable, wherein the loader is used to load the medical device, the loader is connected to the delivery sheath and located on the proximal side of the delivery sheath, the steel cable is detachably connected to the medical device, and the steel cable can push the medical device from the loader into the delivery sheath, characterized in that, The same-sized conveying system is used to convey medical devices of different sizes. Multiple marking sections are sequentially arranged axially near the proximal end of the steel cable. A reference section is provided on the loader. Each marking section is used to mark a medical device of a different size. When one of the marking sections coincides with the reference section, the medical device corresponding to that marking section is conveyed to the release position via the loader and conveying sheath. The delivery sheath includes a tube base and a tube body connected to each other. The tube base has a first channel and a second channel that are interconnected from the proximal end to the distal end. The tube body is connected to the second channel. A connecting channel is provided between the first channel and the second channel. The first channel, the connecting channel, and the second channel are connected in sequence. The inner diameter of the connecting channel decreases first and then increases from the proximal end to the distal end. The connecting channel has a proximal portion and a distal portion that are interconnected. In the cross-section along the axial direction of the connecting channel, the curvature of the proximal portion of the curved surface structure of the connecting channel is less than the curvature of the distal portion.

2. The conveying system as described in claim 1, characterized in that, The loader includes a loading tube, and the reference part is a mark provided on the proximal end of the loading tube; or, a window structure is provided on the loading tube, and the window structure is the reference part; or, the proximal end of the loading tube is the reference part; or, the proximal end of the loading tube is connected to the reference part.

3. The conveying system as described in claim 1, characterized in that, The loader includes a loading tube, which includes a transparent tube body, and the reference portion is provided on the loading tube.

4. The conveying system as described in claim 1, characterized in that, The loader includes a loading tube and a loader hemostatic valve, which is connected to the proximal end of the loading tube and is the reference portion; or, the reference portion is a mark provided on the proximal end of the loader hemostatic valve; or, the proximal end of the loader hemostatic valve is connected to the reference portion.

5. The conveying system as described in claim 1, characterized in that, The steel cable comprises a first part and a second part that are interconnected from the near end to the far end. The second part is a braided structure, and the first part is a rod-shaped structure.

6. The conveying system as described in claim 1, characterized in that, The loader includes a loading tube, the outer diameter of which is less than or equal to the inner diameter of the first channel, and the outer diameter of which is at least greater than the inner diameter of the distal end of the connecting channel. The loading tube is inserted into or can be inserted into the first channel, and the distal end of the loading tube abuts against the inner wall of the connecting channel to remain fixed.

7. The conveying system as described in claim 6, characterized in that, The inner diameter of the distal end of the connecting channel is the same as the inner diameter of the second channel or the inner diameter of the pipe; or, the inner diameter of the distal end of the connecting channel is smaller than the inner diameter of the second channel or the inner diameter of the pipe.

8. The conveying system as described in claim 6, characterized in that, The connecting channel has an inner surface with a curved structure, and the connecting channel is connected to the second channel or the tube body by an arc transition.

9. The conveying system as described in claim 6, characterized in that, The proximal end of the tube is located in the middle or near the second channel.

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