Conveying system

Abstract

According to the conveying system, an inner catheter comprises a near-end section, a central section and a far-end section which are axially connected, the near-end section is located at the near end of the central section, and the far-end section is located at the far end of the central section; the central section comprises at least two unit sections which are axially connected, the flexibility of at least one unit section is different from that of at least one other unit section, and the outer catheter is movably arranged outside the inner catheter in a sleeving mode. According to the conveying system, based on the diversified flexibility design in the central section, the intravascular stent can have high flexibility when entering a blood vessel according to the positions of the conveying system and the intravascular stent in the using process. Therefore, the overall flexibility of the conveying system can be effectively improved, the conveying system can smoothly enter a lesion blood vessel with the tumor neck angle larger than 60 degrees, the original state of the blood vessel cannot be pulled straight, and accurate positioning of the support is achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of medical devices, in particular to a delivery system. BACKGROUND

[0002] Abdominal aortic aneurysm is a common aortic disease. The main treatment methods for abdominal aortic aneurysm currently include traditional open surgery and endovascular repair of abdominal aortic aneurysm. Endovascular repair of abdominal aortic aneurysm has been rapidly developed due to its small trauma, fast postoperative recovery, and low surgical mortality.

[0003] However, the biggest challenge of the current endovascular repair of abdominal aortic aneurysm is the lesion with a neck angle greater than 60 degrees. When the existing vascular stent is implanted in vivo, the delivery system is easy to straighten the blood vessel due to the large neck angle (greater than 60 degrees) of the aneurysm. In this case, if the vascular stent is released, it is easy to cause inaccurate positioning of the vascular stent, resulting in insufficient anchoring area of the vascular stent, and internal leakage and other phenomena. Meanwhile, the relatively hard delivery system can also cause damage to the curved blood vessel, which is fatal to the patient. SUMMARY

[0004] Therefore, it is necessary to provide a delivery system aiming at the above-mentioned technical problems.

[0005] The present application provides a delivery system, which comprises:

[0006] an inner catheter comprising an axially connected proximal segment, a central segment and a distal segment, the proximal segment being located at the proximal end of the central segment, and the distal segment being located at the distal end of the central segment; the central segment comprises at least two unit segments connected axially, and the flexibility of at least one unit segment is different from that of at least one other unit segment;

[0007] an outer catheter movably sleeved outside the inner catheter.

[0008] In one embodiment, the flexibility of several unit segments of the central segment gradually increases in the direction from the distal end to the proximal end of the central segment; and / or,

[0009] At least one of the inner part and the outer part of the inner catheter is sleeved with a protective tube.

[0010] In one embodiment, at least one unit segment is provided with a cutting structure, and the unit segment improves the flexibility through the cutting structure.

[0011] In one embodiment, the cutting structure is configured as a helical cutting structure, and the cutting structure has at least one of a helical pitch and a cutting axis length.

[0012] Wherein, the helical pitch of the cutting structure of at least one of the unit segments is different from the helical pitch of the cutting structure of at least one other unit segment, thereby making the compliance of at least one of the unit segments different from the compliance of at least one other unit segment; and / or, the helical pitch of the cutting axis length of the cutting structure of at least one of the unit segments is different from the helical pitch of the cutting axis length of at least one other unit segment, thereby making the compliance of at least one of the unit segments different from the compliance of at least one other unit segment.

[0013] In one embodiment, the central segment comprises at least the following unit segments:

[0014] The first unit segment has a first degree of compliance;

[0015] The second unit segment has its proximal end connected to the distal end of the first unit segment, and the second unit segment has a second flexibility.

[0016] The third unit segment, the proximal end of which is connected to the distal end of the second unit segment, has a third degree of compliance;

[0017] Wherein, the first softness is greater than at least one of the second softness and the third softness; and / or, the second softness is greater than the third softness.

[0018] In one embodiment, the first unit segment is provided with a helical first cutting structure along its axial direction, the first cutting structure having a first helical pitch;

[0019] The second unit segment is provided with a helical second cutting structure along its axial direction, and the second cutting structure has a second helical pitch;

[0020] The third unit segment is provided with a helical third cutting structure along its axial direction, and the third cutting structure has a third helical pitch;

[0021] Wherein, the first helical pitch is less than at least one of the second helical pitch and the third helical pitch; and / or, the second helical pitch is less than the third helical pitch.

[0022] In one embodiment, the first cutting structure has a first cutting axis length, the second cutting structure has a second cutting axis length, and the third cutting structure has a third cutting axis length.

[0023] Wherein, the first cutting axis length is less than at least one of the second cutting axis length and the third cutting axis length; and / or, the second cutting axis length is less than the third cutting axis length.

[0024] In one embodiment, the conveying system includes:

[0025] A guiding assembly is fitted to the proximal segment of the internal catheter via an adapter mechanism configured to allow circumferential rotation of the guiding assembly relative to the internal catheter and to prevent axial movement of the guiding assembly relative to the internal catheter.

[0026] In one embodiment, the switching mechanism includes:

[0027] A connecting part is disposed in the inner conduit;

[0028] A limiting portion is disposed on the guide assembly and configured to be rotatably connected to the adapter portion, thereby allowing the guide assembly to rotate circumferentially relative to the inner catheter and prohibiting the guide assembly from moving axially relative to the inner catheter.

[0029] In one embodiment, the number of the adapters is configured to be at least one; and / or,

[0030] The proximal end of the adapter is connected to the internal catheter, the distal end of the adapter faces the distal end of the internal catheter, and the adapter has an inclined angle relative to the axis of the internal catheter; and / or,

[0031] The adapter is configured as any one of a rod-shaped member, a plate-shaped member, and a strip-shaped member; and / or,

[0032] The limiting portion is configured as at least one annular groove in the inner cavity of the guide assembly.

[0033] In one embodiment, the conveying system includes:

[0034] The recycling mechanism includes a spreading element and a recycling sleeve;

[0035] The dilation element is disposed on the inner catheter, the dilation element having an expanded state and a contracted state, and is configured to dilate the vascular stent located in the inner catheter in the expanded state;

[0036] The recovery sleeve is movably sleeved outside the inner conduit and is configured to control the expansion and contraction states of the spreading element.

[0037] In one embodiment, the spreading element is located at the proximal end of the central segment of the internal conduit; and / or,

[0038] The spreading element includes at least two spreading arms, the distal ends of which are connected to the internal catheter, the proximal ends of which face the proximal end of the internal catheter, and the spreading arms have an inclined angle relative to the axis of the internal catheter; and / or,

[0039] The retrieved cannula is configured to be movably fitted inside the external catheter, and the space between the retrieved cannula and the external catheter is configured for mounting a vascular stent; and / or,

[0040] The proximal end of the recovery sleeve is provided with a flange structure that folds towards its distal end; and / or,

[0041] The material of the recovery sleeve is configured as polyetheretherketone.

[0042] In one embodiment, the distal end of the spreading arm is connected between the central segment and the proximal segment of the internal catheter; and / or,

[0043] The expanding element further includes a retaining sleeve fitted to the inner conduit, and the distal ends of a plurality of the expanding arms are connected to the retaining sleeve, thereby being indirectly disposed in the inner conduit via the retaining sleeve; and / or,

[0044] The spreading arm is configured as a curved arm; and / or,

[0045] The spreading arm has at least one through hole.

[0046] In one embodiment, the conveying system includes:

[0047] A control assembly comprising at least a control wire configured to control at least one of a vascular stent and a dilation element located in the inner catheter.

[0048] In one embodiment, the compliance of different sections of the external conduit along its axis may be the same or different; and / or,

[0049] The outer conduit includes a middle tube, an outer tube, and an inner tube. The outer tube is sleeved on the outer layer of the middle tube, and the inner tube is sleeved on the inner layer of the middle tube. The middle tube is configured as a braided structure made of stainless steel braided wire, the outer tube is made of polyether block polyamide, and the inner tube is made of polytetrafluoroethylene.

[0050] The aforementioned delivery system, based on the diverse flexibility design in the central section, can achieve a high degree of flexibility in the insertion of the vascular stent into the blood vessel, depending on the position of the delivery system and the vascular stent during use.

[0051] For example, the most proximal segment of the central section can possess high flexibility, allowing the delivery system to freely conform to the vessel's shape upon initial entry. Subsequent segments can also maintain high flexibility, thus enabling the stent to be ligated at this point. This high flexibility compensates for the stent's own compressibility, achieving overall flexibility when the stent and delivery system are integrated. Further flexibility can be enhanced in subsequent segments, primarily to ensure smooth entry of the entire delivery system into the vessel along with the external catheter. When delivering the stent to the target location, appropriate flexibility allows for seamless integration of the entire delivery system into the vessel.

[0052] Therefore, it can be seen that the central segment of the aforementioned internal catheter, through its diverse flexibility design, can effectively improve the overall flexibility of the delivery system, enabling the delivery system to smoothly enter diseased blood vessels with a neck angle greater than 60 degrees without straightening the original state of the blood vessel, thus achieving precise stent positioning. Attached Figure Description

[0053] Figure 1 This is a schematic diagram of the structure of a conveying system provided in one embodiment of this application.

[0054] Figure 2 This is a schematic diagram of the internal catheter provided in one embodiment of this application.

[0055] Figure 3 This is a schematic diagram of the structure of a transfer mechanism provided in one embodiment of this application.

[0056] Figure 4 This is a schematic diagram of the first state of a recycling mechanism provided in one embodiment of this application.

[0057] Figure 5 This is a schematic diagram of the second state of a recycling mechanism provided in one embodiment of this application.

[0058] Figure 6 This is a schematic diagram of the structure of a spreading element provided in one embodiment of this application.

[0059] Figure 7 This is a schematic diagram of a control wire passing through a support element, according to one embodiment of this application.

[0060] Figure 8 This is a schematic diagram of the flange structure provided in one embodiment of this application.

[0061] Figure 9 This is a schematic diagram of the structure of a vascular stent provided in one embodiment of this application, showing how a spreading element spreads the stent.

[0062] Figure 10 For example Figure 9 The diagram shows a perspective view of the expanding element expanding the vascular stent.

[0063] Figure 11 For example Figure 9 The diagram shows the structure of the expanding element contracting.

[0064] Figure 12 This is a schematic diagram of the implanted structure of a delivery system provided in one embodiment of this application.

[0065] Figure 13 This is a schematic diagram of the layer structure of an external catheter provided in one embodiment of this application.

[0066] Icon labels:

[0067] 100. Vascular stents;

[0068] 1000, Internal catheter; 2000, External catheter; 3000, Guiding assembly; 4000, Adapter mechanism; 5000, Retrieval mechanism; 6000, Control assembly;

[0069] 1100, proximal segment; 1200, central segment; 1300, distal segment;

[0070] 1210, First Unit Segment; 1220, Second Unit Segment; 1230, Third Unit Segment;

[0071] 1211, First cutting structure; 1221, Second cutting structure; 1231, Third cutting structure;

[0072] 1211a, First helical pitch; 1221a, Second helical pitch; 1231a, Third helical pitch;

[0073] 1211b, First cutting axis length; 1221b, Second cutting axis length; 1231b, Third cutting axis length;

[0074] 2100, middle layer tube; 2200, outer layer tube; 2300, inner layer tube;

[0075] 4100. Adapter part; 4200. Limiting part;

[0076] 5100, Spreading element; 5200, Recycling sleeve; 5110, Fixing sleeve; 5120, Spreading arm; 5130, Through hole; 5210, Flanged structure;

[0077] 6100. Control the thread. Detailed Implementation

[0078] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0079] To more clearly describe the structure of the delivery system, the term "distal" is defined herein as the end furthest from the subject during the surgical procedure, and "proximal" as the end closest to the subject during the surgical procedure. Unless otherwise defined, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0080] See Figure 1 As shown, this application provides a delivery system, which includes an inner conduit 1000 and an outer conduit 2000, the outer conduit 2000 being movably sleeved outside the inner conduit 1000. (Continue reading) Figure 2 As shown, the internal catheter 1000 includes an axially connected proximal segment 1100, a central segment 1200, and a distal segment 1300. The proximal segment 1100 is located proximal to the central segment 1200, and the distal segment 1300 is located distal to the central segment 1200, thus forming a complete internal catheter 1000. The proximal segment 1100, central segment 1200, and distal segment 1300 can be integrally formed, or they can be separate structures joined together to form the internal catheter 1000 according to flexibility design requirements. Those skilled in the art can design according to actual needs, and no limitation is made here.

[0081] Continue reading Figure 2 As shown, the central section 1200 of the inner conduit 1000 may include at least two axially connected unit segments. The number of these unit segments can be designed according to actual needs; for example, the number of unit segments can be two, three, four, five, six, or other suitable numbers, which are not limited here. It should be noted that in the scheme of diversified compliance design, the compliance of at least one unit segment among several unit segments can be different from the compliance of at least one other unit segment. That is, several unit segments can have different compliance, and some unit segments can have the same compliance. Moreover, unit segments with different compliance can be arbitrarily arranged and laid out axially according to needs, thereby forming a diversified central section 1200, which is not limited here.

[0082] In one embodiment, the compliance of several unit segments of the central segment 1200 can be defined to gradually increase along the direction from the distal to the proximal end, thus allowing the central segment 1200 to gradually acquire greater compliance towards the proximal end. Therefore, based on the diverse compliance design in the central segment 1200, a high degree of compliance can be achieved when the vascular stent 100 enters the blood vessel during use, depending on the position of the delivery system and the vascular stent 100.

[0083] For example, the most proximal segment of the central segment 1200 can possess high flexibility, allowing the delivery system to freely follow the vascular morphology upon initial entry into the blood vessel. Subsequent segments can also possess high flexibility, thus enabling the vascular stent 100 to be ligated at this point. This high flexibility compensates for the inherent rigidity of the vascular stent 100 during compression, achieving a smooth integration of the vascular stent 100 and the delivery system. Further flexibility can be enhanced in subsequent segments, primarily to ensure that they enter the blood vessel simultaneously with the external catheter 2000. When delivering the vascular stent 100 to the target location, appropriate flexibility allows the entire delivery system to smoothly enter the blood vessel.

[0084] Therefore, it can be seen that the central segment 1200 of the aforementioned inner catheter 1000, through its diverse flexibility design, can effectively improve the overall flexibility of the delivery system, enabling the delivery system to smoothly enter diseased blood vessels with a neck angle greater than 60 degrees without straightening the original state of the blood vessel, thus achieving precise stent positioning.

[0085] At least one of the inner conduit 1000's interior and exterior is fitted with a protective tube. For example, a protective tube may be fitted only inside the inner conduit 1000, or only on the exterior of the inner conduit 1000, or both inside and outside the inner conduit 1000 may be fitted with protective tubes. The protective tube may be a heat-shrink tubing with a protective function, thereby ensuring that the inner conduit 1000 will not break under compliant bending conditions.

[0086] The compliance of several unit segments of the central segment 1200 can be designed in various ways, such as through materials and structures. For example, the compliance of several unit segments of the central segment 1200 can be achieved through different cutting methods with different parameters. For example, in one embodiment, at least one unit segment is provided with a cutting structure, which improves the compliance of the unit segment. The cutting structure can be constructed through various cutting methods. For example, the cutting structure can be achieved by helical cutting, thereby forming a helical cutting structure, such that the cutting structure has at least one of helical pitch and cutting axis length.

[0087] Specifically, the helical pitch of the cutting structure of at least one unit segment can differ from the helical pitch of the cutting structures of at least one other unit segment, thereby making the compliance of at least one unit segment different from that of at least one other unit segment. Furthermore, the helical pitch of the cutting axis length of the cutting structure of at least one unit segment can also differ from that of the cutting axis length of at least one other unit segment, thereby making the compliance of at least one unit segment different from that of at least one other unit segment, primarily reflected in the axial length that enhances compliance.

[0088] In one embodiment, the central segment 1200 comprises at least a first segment 1210, a second segment 1220, and a third segment 1230. The proximal end of the second segment 1220 is connected to the distal end of the first segment 1210, and the proximal end of the third segment 1230 is connected to the distal end of the second segment 1220. When the vascular stent 100 is assembled with the inner guide rod, the vascular stent 100 can cover the second segment 1220 and is located between the first segment 1210 and the third segment 1230. Therefore, the second segment 1220 is the stent coverage area, the first segment 1210 is the proximal stent area, and the third segment 1230 is the distal stent area.

[0089] The first unit segment 1210 has a first degree of compliance, the second unit segment 1220 has a second degree of compliance, and the third unit segment 1230 has a third degree of compliance. Therefore, the first degree of compliance may be greater than at least one of the second degree of compliance and the third degree of compliance, and the second degree of compliance may be greater than the third degree of compliance.

[0090] For different designs of the above-mentioned segment cutting structures, please refer to [reference needed]. Figure 2 As shown, in one embodiment, the first unit segment 1210 is provided with a helical first cutting structure 1211 along its axial direction, and the cutting method can be selected as helical cutting, thereby giving the first cutting structure 1211 a first helical pitch 1211a and a first cutting axis length 1211b. The second unit segment 1220 is provided with a helical second cutting structure 1221 along its axial direction, and the cutting method can be selected as helical cutting, thereby giving the second cutting structure 1221 a second helical pitch 1221a and a second cutting axis length 1221b. The third unit segment 1230 is provided with a helical third cutting structure 1231 along its axial direction, and the cutting method can be selected as helical cutting, thereby giving the third cutting structure 1231 a third helical pitch 1231a and a third cutting axis length 1231b.

[0091] The parameter that the first helical pitch 1211a is smaller than the second helical pitch 1221a and the third helical pitch 1231a can be designed according to the compliance design requirements. For example, the first helical pitch 1211a is smaller than at least one of the second helical pitch 1221a and the third helical pitch 1231a, and the second helical pitch 1221a can also be smaller than the third helical pitch 1231a. Furthermore, the first cutting axis length 1211b can also be designed to be smaller than at least one of the second cutting axis length 1221b and the third cutting axis length 1231b, and the second cutting axis length 1221b can also be smaller than the third cutting axis length 1231b, according to the compliance design requirements.

[0092] For example, the first unit segment 1210 can cut 200 degrees during spiral cutting, leaving 40 degrees uncut. The first spiral pitch 1211a is designed to be 2mm, and the first cutting shaft length 1211b is designed to be 35mm. The second unit segment 1220 can cut 200 degrees during spiral cutting, leaving 40 degrees uncut. The second spiral pitch 1221a is designed to be 2.5mm, and the second cutting shaft length 1221b is designed to be 165.5mm. The third unit segment 1230 can cut 200 degrees during spiral cutting, leaving 40 degrees uncut. The third spiral pitch 1231a is designed to be 3.5mm, and the third cutting shaft length 1231b is designed to be 243mm.

[0093] In addition, those skilled in the art can design the parameters of the first helical pitch 1211a, the second helical pitch 1221a and the third helical pitch 1231a, as well as the parameters of the first cutting shaft length 1211b, the second cutting shaft length 1221b and the third cutting shaft length 1231b, to other values ​​according to actual needs, without limitation here.

[0094] Therefore, by designing the central segment 1200 of the inner catheter 1000 with flexibility based on the above-mentioned spiral cutting method, the vascular stent 100 can achieve high flexibility when entering the blood vessel according to the position of the delivery system and the vascular stent 100 during use.

[0095] For example, the first unit segment 1210 is the closest region in the central segment 1200. When the delivery system first enters the blood vessel, because the first unit segment 1210 has high flexibility, it can freely enter the blood vessel according to the shape of the blood vessel.

[0096] The second unit segment 1220 also has high flexibility. Since the second unit segment 1220 is the coverage area of ​​the vascular stent 100 and needs to be tied to the second unit segment 1220, the flexibility of the second unit segment 1220 can be used to compensate for the compression stiffness of the vascular stent 100 itself, so as to achieve the flexibility after the vascular stent 100 is combined with the delivery system.

[0097] The third unit segment 1230 also has improved flexibility. The main purpose is that the third unit segment 1230 and the external catheter 2000 need to enter the blood vessel at the same time to deliver the vascular stent 100 to the target position. Therefore, with appropriate flexibility, the entire delivery system can be smoothly delivered into the blood vessel.

[0098] In addition, it should be noted that the distal segment 1300 and proximal segment 1100 of the inner catheter 1000 are not helically cut, meaning that the design of the flexibility of the distal segment 1300 and proximal segment 1100 is not altered, thereby maintaining sufficient rigidity. Due to the greater rigidity of the distal segment 1300, it can provide greater external support when inserted into the blood vessel.

[0099] In one embodiment, the delivery system includes a guide assembly 3000, which may be a conical head or similar structure capable of guiding within a blood vessel. The guide assembly 3000 can be mounted to the proximal segment 1100 of the inner catheter 1000 via an adapter mechanism 4000. This indirect mounting via the adapter mechanism 4000 allows the guide assembly 3000 to rotate circumferentially relative to the inner catheter 1000 while preventing axial movement. Since the guide assembly 3000 is fixed axially relative to the inner catheter 1000 but can rotate circumferentially, when the delivery system enters the blood vessel, it ensures that the guide assembly 3000 passively rotates. This passive rotation means that when the guide assembly 3000 contacts the inner wall of the blood vessel and forms a relative force during its advancement, the rotation of the guide assembly 3000 conforms to the aforementioned force, thereby reducing scraping of the blood vessel and avoiding tissue damage through its own rotation.

[0100] The adapter 4000 can be configured with a variety of structural designs, for example, see [link to relevant documentation] Figure 3 As shown, in one embodiment, the adapter mechanism 4000 includes an adapter portion 4100 and a limiting portion 4200. The adapter portion 4100 is disposed on the inner catheter 1000, and the limiting portion 4200 is disposed on the guide assembly 3000. In this case, the limiting portion 4200 can be configured to be rotatably connected to the adapter portion 4100, thereby allowing the guide assembly 3000 to rotate circumferentially relative to the inner catheter 1000 and preventing axial movement of the guide assembly 3000 relative to the inner catheter 1000. This assembly feature, which allows the guide assembly 3000 to rotate only circumferentially and not axially, enables the delivery system to smoothly enter diseased blood vessels with a neck angle greater than 60 degrees without damaging the vessel.

[0101] Continue reading Figure 3As shown, in one embodiment, the number of adapter portions 4100 is configured to be at least one, for example, two, three, four, etc. Furthermore, the proximal end of the adapter portion 4100 can be connected to the inner conduit 1000, the distal end of the adapter portion 4100 faces the distal end of the inner conduit 1000, and the adapter portion 4100 has an inclined angle relative to the axis of the inner conduit 1000, thereby forming an angled space between the adapter portion 4100 and the inner conduit 1000 with the distal end facing the opening. Simultaneously, the adapter portion 4100 can be configured as any one of a rod-shaped member, a sheet-shaped member, and a strip-shaped member, or can be designed as other structures as needed, without limitation. Correspondingly, the limiting portion 4200 can be configured as at least one annular groove in the cavity of the guide assembly 3000, so that when the adapter portion 4100 is located in the annular groove, the adapter portion 4100 can only rotate circumferentially along the annular groove and cannot move axially.

[0102] Continue reading Figures 4 to 12 As shown, in one embodiment, the delivery system may further include a retrieval mechanism 5000. The retrieval mechanism 5000 enables the delivery system to have a release and retrieval mechanism during use, actively adjusting the proximal shape of the vascular stent 100, effectively controlling the release of the vascular stent 100 (the proximal diameter of the stent increases, making it easier to anchor the blood vessel), and effectively controlling the contraction of the vascular stent 100 (the proximal diameter of the stent decreases, making it easier to reposition the stent). This achieves secondary positioning and secondary release of the vascular stent 100, and based on this release and retrieval mechanism, achieves the effect of precise positioning and re-release of the vascular stent 100.

[0103] For information regarding the aforementioned recycling organization 5000, please refer to [link / reference needed]. Figure 4 and Figure 5 As shown, the retrieval mechanism 5000 may include an opening element 5100 and a retrieval sleeve 5200. The opening element 5100 is disposed on the inner catheter 1000 and has an expanded state and a contracted state. It is configured to open the vascular stent 100 located on the inner catheter 1000 in the expanded state. The retrieval sleeve 5200 is movably sleeved on the outside of the inner catheter 1000. The axial movement of the retrieval sleeve 5200 relative to the inner catheter 1000 can communicate with the axial movement of the outer catheter 2000, also achieved through the control component 6000 (such as a control handle), which is not limited here. Therefore, the axial movement of the retrieval sleeve 5200 relative to the inner catheter 1000 can be configured to control the expanded and contracted states of the opening element 5100.

[0104] Therefore, refer to Figures 9 to 12 As shown, when the outer catheter 2000 is released relative to the inner catheter 1000, the expanding element 5100 will automatically spring open and expand due to its own deformation function, converting to an expanded state. At this time, as... Figure 4 ,Figure 9 and Figure 10 As shown, the expanding element 5100 can cause the proximal end of the vascular stent 100 to expand and adhere to the blood vessel. However, when the retrieval cannula 5200 is pushed proximally, if the retrieval cannula 5200 compresses the expanding element 5100, as... Figure 5 , Figure 11 As shown, the expansion element 5100 can be compressed and converted to a contracted state. At this time, the expansion element 5100 will cause the proximal end of the vascular stent 100 to contract, so that the vascular stent 100 is no longer attached to the blood vessel. Therefore, in this state, the position of the vascular stent 100 can be readjusted for secondary positioning. After positioning is completed, the vascular stent 100 can be released by controlling the wire 6100.

[0105] In one embodiment, the spreading element 5100 is located at the proximal end of the central segment 1200 of the inner catheter 1000. For example, the distal end of the spreading arm 5120 may be connected between the central segment 1200 and the proximal segment 1100 of the inner catheter 1000. The spreading element 5100 may include at least two spreading arms 5120, the distal ends of which are connected to the inner catheter 1000, the proximal ends of which face the proximal end of the inner catheter 1000, and the spreading arms 5120 have an inclined angle relative to the axis of the inner catheter 1000. The spreading arms 5120 may be configured as curved arms or straight arms, without limitation. Furthermore, the spreading element 5100 may also include a fixing sleeve 5110, which is fitted to the inner catheter 1000, and the distal ends of several spreading arms 5120 are connected to the fixing sleeve 5110, thereby indirectly disposed in the inner catheter 1000 through the fixing sleeve 5110.

[0106] The retrieval cannula 5200 is configured to be movably sleeved inside the external catheter 2000, and the retrieval cannula 5200 and the external catheter 2000 are configured for mounting the vascular stent 100. The retrieval cannula 5200 is made of polyetheretherketone (PEEK), and as... Figure 8 As shown, the proximal end of the recovery sleeve 5200 is provided with a flange structure 5210 that folds towards its distal end. Through a special process, the proximal flange of the recovery sleeve 5200 is formed into a double layer. This ensures that there is sufficient hardness to press down the opening element 5100 when pushed towards the proximal end, while the hardness of the metal material does not affect the flexibility.

[0107] In one embodiment, the delivery system includes a control assembly 6000, which at least includes a control wire 6100 configured to control a connection between at least one of a vascular stent 100 and a retracting element 5100 located in the inner catheter 1000. In this case, the retracting arm 5120 may have at least one through-hole 5130, see [reference]. Figure 7 In the illustrated scheme, each extension arm 5120 can be designed with two through holes 5130. For example...Figure 7 As shown, the control wire 6100 can be passed from the distal end of the delivery system into a through hole 5130, then through another through hole 5130, and then through the proximal end cover of the vascular stent 100, and then into one of the through holes 5130, thereby connecting the proximal end of the vascular stent 100 to the expansion element 5100.

[0108] The external catheter 2000 can also be designed for flexibility to ensure that different sections of the external catheter 2000 exhibit the same or different levels of flexibility along its axial direction. For example, the flexibility of the external catheter 2000 can be altered through different braided filament arrangements and the design of highly elastic inner and outer layer materials. (See also...) Figure 13 As shown, in one embodiment, the outer conduit 2000 may include a middle layer tube 2100, an outer layer tube 2200, and an inner layer tube 2300. The outer layer tube 2200 is sleeved on the outer layer of the middle layer tube 2100, and the inner layer tube 2300 is sleeved on the inner layer of the middle layer tube 2100. The middle layer tube 2100 is configured with a braided structure made of stainless steel braided wire, the outer layer tube 2200 is made of polyether block polyamide, and the inner layer tube 2300 is made of polytetrafluoroethylene. When the middle layer tube 2100 is braided using stainless steel braided wire, for example, a 32-strand double-strand, 60 PPI braiding method can be selected. The outer conduit 2000 constructed in this way can maintain both high yield strength and tensile strength while ensuring good flexibility.

[0109] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0110] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A conveying system, characterized in that, The conveying system includes: An internal catheter (1000) comprising an axially connected proximal segment (1100), a central segment (1200), and a distal segment (1300), the proximal segment (1100) being located proximally to the central segment (1200), and the distal segment (1300) being located distally to the central segment (1200); the central segment (1200) comprising at least two axially connected unit segments, at least one of the unit segments having a different compliance than the other at least one of the unit segments; An external catheter (2000) is movably sleeved outside the internal catheter (1000).

2. The conveying system according to claim 1, characterized in that, Along the direction from the distal to the proximal end of the central segment (1200), the compliance of a plurality of the unit segments of the central segment (1200) gradually increases; and / or, At least one of the inner and outer parts of the inner catheter (1000) is fitted with a protective tube.

3. The conveying system according to claim 1, characterized in that, At least one of the unit segments is provided with a cutting structure, which improves the flexibility of the unit segment.

4. The conveying system according to claim 3, characterized in that, The cutting structure is configured as a helical cutting structure, and the cutting structure has at least one of a helical pitch and a cutting axis length. Wherein, the helical pitch of the cutting structure of at least one of the unit segments is different from the helical pitch of the cutting structure of at least one other unit segment, thereby making the compliance of at least one of the unit segments different from the compliance of at least one other unit segment; and / or, the helical pitch of the cutting axis length of the cutting structure of at least one of the unit segments is different from the helical pitch of the cutting axis length of at least one other unit segment, thereby making the compliance of at least one of the unit segments different from the compliance of at least one other unit segment.

5. The conveying system according to claim 1, characterized in that, The central segment (1200) comprises at least the following unit segments: The first unit segment (1210) has a first degree of compliance; The second unit segment (1220) has its proximal end connected to the distal end of the first unit segment (1210), and the second unit segment (1220) has a second flexibility; The third unit segment (1230) has its proximal end connected to the distal end of the second unit segment (1220) and has a third degree of compliance. Wherein, the first softness is greater than at least one of the second softness and the third softness; and / or, the second softness is greater than the third softness.

6. The conveying system according to claim 5, characterized in that, The first unit segment (1210) is provided with a spiral first cutting structure (1211) along its axial direction, and the first cutting structure (1211) has a first spiral pitch (1211a). The second unit segment (1220) is provided with a helical second cutting structure (1221) along its axial direction, and the second cutting structure (1221) has a second helical pitch (1221a). The third unit segment (1230) is provided with a helical third cutting structure (1231) along its axial direction, and the third cutting structure (1231) has a third helical pitch (1231a). Wherein, the first helical pitch (1211a) is less than at least one of the second helical pitch (1221a) and the third helical pitch (1231a); and / or, the second helical pitch (1221a) is less than the third helical pitch.

7. The conveying system according to claim 6, characterized in that, The first cutting structure (1211) has a first cutting axis length (1211b), the second cutting structure (1221) has a second cutting axis length (1221b), and the third cutting structure (1231) has a third cutting axis length (1231b). Wherein, the first cutting axis length (1211b) is less than at least one of the second cutting axis length (1221b) and the third cutting axis length (1231b); and / or, the second cutting axis length (1221b) is less than the third cutting axis length (1231b).

8. The conveying system according to claim 1, characterized in that, The conveying system includes: A guide assembly (3000) is mounted on the proximal segment (1100) of the inner catheter (1000) via an adapter (4000), the adapter (4000) being configured to allow the guide assembly (3000) to rotate circumferentially relative to the inner catheter (1000) and to prevent the guide assembly (3000) from moving axially relative to the inner catheter (1000).

9. The conveying system according to claim 8, characterized in that, The switching mechanism (4000) includes: A connecting part (4100) is disposed on the inner conduit (1000). A limiting part (4200) is disposed on the guide assembly (3000) and is configured to be rotatably connected to the adapter (4100), thereby allowing the guide assembly (3000) to rotate circumferentially relative to the inner catheter (1000) and prohibiting the guide assembly (3000) from moving axially relative to the inner catheter (1000).

10. The conveying system according to claim 9, characterized in that, The number of the adapters (4100) is configured to be at least one; and / or, The proximal end of the adapter (4100) is connected to the inner catheter (1000), the distal end of the adapter (4100) faces the distal end of the inner catheter (1000), and the adapter (4100) has an inclined angle relative to the axis of the inner catheter (1000); and / or, The adapter (4100) is configured as any one of a rod-shaped member, a plate-shaped member, and a strip-shaped member; and / or, The limiting part (4200) is configured as at least one annular groove in the cavity of the guide assembly (3000).

11. The conveying system according to claim 1, characterized in that, The conveying system includes: A recycling mechanism (5000) includes a spreading element (5100) and a recycling sleeve (5200). The spreading element (5100) is disposed on the inner catheter (1000), the spreading element (5100) having an expanded state and a contracted state, and is configured to spread the vascular stent (100) located in the inner catheter (1000) in the expanded state. The recovery sleeve (5200) is movably sleeved outside the inner conduit (1000) and is configured to control the expansion and contraction states of the spreading element (5100).

12. The conveying system according to claim 11, characterized in that, The spreading element (5100) is located at the proximal end of the central segment (1200) of the inner catheter (1000); and / or, The spreading element (5100) includes at least two spreading arms (5120), the distal ends of which are connected to the inner catheter (1000), the proximal ends of which face towards the proximal end of the inner catheter (1000), and the spreading arms (5120) have an inclined angle relative to the axis of the inner catheter (1000); and / or, The retrieved cannula (5200) is configured to be movably fitted inside the external catheter (2000), and the retrieved cannula (5200) and the external catheter (2000) are configured for mounting a vascular stent (100); and / or, The proximal end of the recovery sleeve (5200) is provided with a flange structure (5210) that folds towards its distal end; and / or, The material of the recycling sleeve (5200) is configured as polyetheretherketone.

13. The conveying system according to claim 12, characterized in that, The distal end of the spreading arm (5120) is connected between the central segment (1200) and the proximal segment (1100) of the internal catheter (1000); and / or, The spreading element (5100) further includes a fixing sleeve (5110) fitted to the inner conduit (1000), the distal ends of a plurality of spreading arms (5120) being connected to the fixing sleeve (5110), thereby being indirectly disposed in the inner conduit (1000) through the fixing sleeve (5110); and / or, The spreading arm (5120) is configured as a curved arm; and / or, The spreading arm (5120) has at least one through hole (5130).

14. The conveying system according to claim 11, characterized in that, The conveying system includes: A control assembly (6000) comprising at least a control wire (6100) configured to control at least one of a vascular stent (100) and a spreading element (5100) located in the inner catheter (1000).

15. The conveying system according to claim 1, characterized in that, The compliance of different sections along the axial direction of the external catheter (2000) may be the same or different; and / or, The outer conduit (2000) includes a middle tube (2100), an outer tube (2200), and an inner tube (2300). The outer tube (2200) is sleeved on the outer layer of the middle tube (2100), and the inner tube (2300) is sleeved on the inner layer of the middle tube (2100). The middle tube (2100) is configured as a braided structure made of stainless steel braided wire, the outer tube (2200) is made of polyether block polyamide, and the inner tube (2300) is made of polytetrafluoroethylene.

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