Delivery assembly and delivery system

Abstract

The present application relates to a delivery assembly and a delivery system. An inner catheter (1000) is provided with a connecting structure (1100), the connecting structure (1100) comprises at least two connecting portions (1101), a stent accommodating space is formed between the inner wall of an outer catheter and the outer wall of the inner catheter (1000), a constraining structure (1200) comprises at least two constraining filaments (1201), and each constraining filament (1201) is used for being detachably connected to the corresponding connecting portion (1101) of the connecting structure (1100).

Description

Conveying components and conveying systems

[0001] Related applications

[0002] This application claims priority to Chinese patent application No. 2025100392716, filed on January 9, 2025, entitled "Conveying Components and Conveying System", the entire contents of which are incorporated herein by reference. Technical Field

[0003] This application relates to the field of medical device technology, and in particular to delivery components and delivery systems. Background Technology

[0004] Endovascular repair of aortic aneurysms is a method of treating aneurysms under dynamic monitoring of digital subtraction angiography (DSA). Compared with open surgery, endovascular repair of aortic aneurysms has significant advantages such as less trauma and fewer complications.

[0005] Endovascular repair of aortic aneurysms mainly involves inserting a stent system through small incisions in both iliac arteries. A folded medical stent with an artificial lining is delivered into the aortic aneurysm cavity. The stent's superelasticity and the barbed structure at its proximal end are used to fix the lining stent to the unaffected vessel walls at the proximal and distal ends of the aneurysm to complete the reconstruction of the abdominal aorta, thereby preventing the aneurysm from enlarging and rupturing.

[0006] With advancements in medical technology, reconstruction of the internal iliac branch arteries has become increasingly common in the treatment of iliac artery aneurysms. One frequently used technique is to reconstruct the branch vessels by placing an internal iliac branch stent via the contralateral femoral artery approach using a "mountain-climbing" technique. However, due to differences in vascular anatomy, in cases with a short common iliac artery, if the proximal end of the main stent is completely released, there is a certain probability that the sheath and delivery devices will interfere with the main stent during the mountain-climbing procedure from the contralateral side. This can lead to risks such as deformation, displacement, or kinking of the main stent. Summary of the Invention

[0007] According to various embodiments of this application, this application provides a conveying component and a conveying system.

[0008] This application provides a conveying assembly, the conveying assembly comprising:

[0009] An internal catheter, wherein the internal catheter is provided with a connecting structure, the connecting structure including at least two connecting parts;

[0010] An external conduit is movably sleeved outside the inner conduit. The inner wall of the external conduit and the outer wall of the inner conduit form a stent-accommodating space for accommodating the target stent.

[0011] A restraint structure comprising at least two restraint threads for securing a target support, wherein each restraint thread is detachably connected to a connecting portion of the connecting structure.

[0012] In one embodiment, the connection structure is disposed at the proximal end of the internal catheter.

[0013] In one embodiment, the different connecting portions in the connecting structure are located at different positions of the inner catheter.

[0014] In one embodiment, several of the connecting portions in the connecting structure are distributed at different positions along the circumference of the inner conduit.

[0015] In one embodiment, a guiding element is provided at the proximal end of the internal catheter, and the connecting structure is disposed on the guiding element, thereby indirectly disposed at the proximal end of the internal catheter through the guiding element.

[0016] In one embodiment, the different connecting portions in the connection structure are located at different positions of the guiding element.

[0017] In one embodiment, a plurality of the connecting portions in the connecting structure are distributed at different positions on the guiding element along the circumferential direction of the guiding element.

[0018] In one embodiment, in the circumferential direction of the inner conduit, the circumferential spacing between all adjacent connecting portions in the connecting structure is the same.

[0019] In one embodiment, the connecting portion is a binding hole located at the proximal end of the inner catheter, the binding hole being used to thread the binding thread.

[0020] In one embodiment, the connecting portion is a binding hole located at the distal end of the guiding element, the binding hole being used to thread the binding thread.

[0021] In one embodiment, the connection structure includes a first connection portion, a second connection portion, and a third connection portion, wherein the first connection portion, the second connection portion, and the third connection portion are evenly distributed along the circumferential direction of the inner conduit;

[0022] In one embodiment, the binding structure includes a first binding thread, a second binding thread, and a third binding thread, wherein the proximal end of the first binding thread is detachably connected to the first connecting portion, the proximal end of the second binding thread is detachably connected to the second connecting portion, and the proximal end of the third binding thread is detachably connected to the third connecting portion.

[0023] This application provides a conveying system, which includes the conveying components described above.

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

[0025] A target support, configured to be conveyed by the conveying assembly, the target support comprising a main support and a branch support, the main support having a support window, the branch support being connected to the support window of the main support, and the inner cavity of the branch support communicating with the inner cavity of the main support via the support window.

[0026] In one embodiment, the conveying system includes:

[0027] A branching device, wherein at least one binding thread of the binding structure is separated from the connecting portion to form a proximal penetration window at the proximal end of the inner catheter, the branching device being used to enter the lumen of the inner catheter through the proximal penetration window of the inner catheter, and to pass through the lumen of the branching stent and exit from the distal end of the branching stent.

[0028] Details of one or more embodiments of this application are set forth in the following drawings and description, and other features, objects and advantages of this application will become apparent from the specification, drawings and claims. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of this application or the conventional technology, the drawings used in the description of the embodiments or the conventional technology will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on the disclosed drawings without creative effort.

[0030] Figure 1 is a schematic diagram of the usage status of the conveying system provided in some embodiments of this application.

[0031] Figure 2 is a partially enlarged schematic diagram of the conveying system in use, as shown in Figure 1.

[0032] Figure 3 is a schematic diagram of the formation of a near-end penetration window provided in some embodiments of this application.

[0033] Figures 4 and 5 are schematic diagrams comparing the position adjustment of the delivery system in the target blood vessel according to some embodiments of this application.

[0034] Figure 6 is a schematic diagram of the delivery state of the branch device to the branch blood vessel provided in some embodiments of this application.

[0035] Figure 7 is a schematic diagram of the complete release of the target stent in the target blood vessel according to some embodiments of this application.

[0036] Reference numerals: 10, Target vessel; 11, Branch vessel; 100, Target stent; 101, Main stent; 102, Branch stent; 103, Proximal insertion window; 200, Branch instrument; 1000, Internal catheter; 1100, Connecting structure; 1200, Restraining structure; 1300, Guiding element; 1101, Connecting part; 1201, Restraining suture. Detailed Implementation

[0037] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0038] To more clearly describe the structure of the aforementioned delivery components and delivery system, the term "distal" is defined herein as the end furthest from the surgical subject during the surgical procedure, and "proximal" as the end closest to the surgical subject during the surgical procedure. Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in this application's specification is for the purpose of describing particular embodiments only and is not intended to be limiting of this application.

[0039] Referring to Figures 1 and 2, this application provides a delivery assembly including an inner conduit 1000, an outer conduit (not shown), and a restraint structure 1200. The inner conduit 1000 and the outer conduit both have axially penetrating cavities, allowing the inner conduit 1000 to be movably inserted within the cavities of the outer conduit, i.e., the outer conduit is movably sleeved outside the inner conduit 1000. After the inner and outer conduits are movably sleeved together, a support accommodating space can be formed between the inner wall of the outer conduit and the outer wall of the inner conduit 1000. This support accommodating space is a radially annular space formed between the inner and outer conduits, and can be used to house the target support 100.

[0040] In one embodiment, as shown in FIG1, the target support 100 may include a main support 101 and a branch support 102. The main support 101 has a support window on its side, which communicates with the inner cavity of the main support 101. The branch support 102 is connected to the support window of the main support 101, and the inner cavity of the branch support 102 communicates with the inner cavity of the main support 101 through the support window, thereby constituting the structure of the target support 100 shown in FIG1. ​​In addition, those skilled in the art can use this conveying assembly to convey other supports with similar structures as needed, and no limitation is made here.

[0041] Continuing as shown in Figure 1, in the above-mentioned delivery assembly, the inner conduit 1000 may be provided with a connecting structure 1100, which is used to detachably connect the restraint structure 1200. For example, the connecting structure 1100 may include at least two connecting parts 1101, and the restraint structure 1200 may include at least two restraint threads 1201, thereby enabling the restraint threads 1201 of the restraint structure 1200 to be matched in number with the connecting parts 1101 of the connecting structure 1100.

[0042] The binding thread 1201 can be used to tighten the target stent 100. For example, the binding thread 1201 can be wrapped around the target stent 100, thereby tightening the target stent 100 into a contracted state. In one embodiment, the binding thread 1201 can be configured to tighten the proximal end of the target stent 100. The binding thread 1201 can be configured to tighten the target stent 100 into a contracted state by wrapping it around the target stent 100 or passing through the bare proximal segment of the target stent 100. Correspondingly, when the binding thread 1201 releases the tightening of the target stent 100, the target stent 100 can unfold into an expanded state without external restraint. The contracted and expanded states of the target stent 100 are unique functions of medical stents and are not limited here.

[0043] In addition to securing the target stent 100, each binding thread 1201 can also be detachably connected to the connecting portion 1101 of the connecting structure 1100. Therefore, when the binding thread 1201 is wound around the target stent 100, the target stent 100 is secured in a contracted state. Simultaneously, when the binding thread 1201 is also connected to a connecting portion 1101 of the connecting structure 1100 of the inner catheter 100, the binding thread 1201 also simultaneously fixes the contracted target stent 100 relative to the inner catheter 1000, positioning the target stent 100 in a contracted state at a specific location within the inner catheter 1000. Conversely, disconnecting the binding thread 1201 from the connecting portion 1101 of the connecting structure 1100 releases the target stent 100 from its position relative to the inner catheter 1000. Releasing the binding thread 1201 from the target stent 100 also releases the target stent 100 to an expanded state.

[0044] When there are multiple binding threads 1201, each binding thread 1201 provides a binding force to the target stent 100 in its contracted state. In this case, the target stent 100 is considered to be in a contracted state only when all binding threads 1201 provide a binding force to the target stent 100. For example, all binding threads 1201 are used to bind the proximal end of the target stent 100, and all binding threads 1201 bind the target stent 100 to a contracted state by wrapping around the target stent 100 or passing through the bare proximal segment of the target stent 100.

[0045] In addition, when a binding thread 1201 detaches from the target support 100, the target support 100 will be partially released. This partial release means that after the target support 100 loses the binding force of a binding thread 1201, it will only be partially unfolded to a certain extent. It will not directly change from a contracted state to an expanded state, but will be in a certain degree of unfolded state between the contracted state and the expanded state.

[0046] Therefore, when the target support 100 is bound by several binding threads 1201, the degree to which the target support 100 is unfolded can be gradually adjusted by adjusting the number of binding threads 1201 that are detached from the target support 100. That is, the more binding threads 1201 that are detached from the target support 100, the greater the degree to which the target support 100 is unfolded, and the closer it is to the expanded state of the target support 100. However, as long as one binding thread 1201 is wrapped around the target support 100, it can be ensured that the target support 100 is not fully unfolded into an expanded state.

[0047] When the aforementioned binding threads 1201 are connected to the connecting structure 1100, the binding threads 1201 will always ensure that the target stent 100 is positioned at a specific location on the inner catheter 1000. The connection between the binding threads 1201 and the connecting structure 1100 is different from the binding threads 1201 wrapping around the target stent 100. Whether one binding thread 1201 or multiple binding threads 1201 are connected to the connecting structure 1100, they will ensure that the target stent 100 is positioned at a specific location on the inner catheter 1000. The positioning of the target stent 100 relative to the inner catheter 1000 will not change due to the number of binding threads 1201 separated from the connecting structure 1100.

[0048] Therefore, when there are several binding threads 1201, the operator can first retract the outer catheter a certain distance relative to the inner catheter 1000. The outer catheter can be retracted until the branch support 102 is exposed outside the outer catheter, at which point the main support 101 is partially released. The position of the main support 101 in the circumferential and axial directions can still be adjusted. After the main support 101 is adjusted to the ideal position, the degree of deployment of the target support 100 can be adjusted by retracting the number of binding threads 1201, thereby forming a proximal insertion window 103 for delivering the branch instrument 200 at the proximal end of the main support 101 of the target support 100. This proximal insertion window 103 is shown in Figure 3.

[0049] Since the number of retractions of the binding wires 1201 can be used to adjust the deployment degree of the target stent 100, an appropriate number of binding wires 1201 can be retracted as needed, thereby adjusting the window area of ​​the proximal insertion window 103 to match the size of the branch instrument 200 and ensure smooth delivery of the branch instrument 200. At this time, it can be ensured that there is enough space for the proximal end of the main stent 101 to enter the branch instrument 200, while ensuring that the main stent 101 is still bound to the inner catheter 1000, so that the position of the main stent 101 can be adjusted again, thereby connecting the inner cavity of the main stent 101 to the outside of the main stent 101 through the proximal insertion window 103.

[0050] During this process, as long as at least one binding thread 1201 is not separated from the connecting structure 1100, the target stent 100 can always be positioned at a specific location in the inner catheter 1000. Therefore, by adjusting the position of the inner catheter 1000, the position of the target stent 100 in the target blood vessel 10 can be indirectly adjusted, so that the branch stent 102 of the target stent 100 can be matched with the branch blood vessel 11 of the target blood vessel 10 in position, which facilitates the delivery of the branch device 200 to the branch blood vessel 11 via the branch stent 102.

[0051] For example, in the comparison between Figures 4 and 5, when the target stent 100 shown in Figure 4 is partially deployed, it is still positioned on the inner catheter 1000 by the binding thread 1201. At this time, the end of the branch stent 102 is not well aligned with the branch vessel 11, and the port position of the branch stent 102 is lower than that of the branch vessel 11. Therefore, the operator can push the inner catheter 1000 a certain distance in the proximal direction (as shown by the arrow in Figure 5), so that the inner catheter 1000 can move the target stent 100 a certain distance in the proximal direction, thereby matching the port position of the branch stent 102 with the branch vessel 11, and achieving an alignment suitable for the delivery of the branch device 200 to the branch vessel 11 via the branch stent 102.

[0052] At this point, as shown in Figure 6, the branch instrument 200 can be delivered into the lumen of the main stent 101 through the proximal insertion window 103. After passing through the lumen of the branch stent 102, it is delivered into the branch vessel 11 according to the shape of the branch stent 102. The entire delivery process of the branch instrument 200 will not interfere with the main stent 101, and the delivery process is very smooth. After all the corresponding operations are completed, the operator can withdraw all the binding threads 1201, so that the target stent 100 is converted to a fully expanded state. At this time, the proximal end of the target stent 100 is completely attached to the wall, presenting the state shown in Figure 7.

[0053] Therefore, considering the differences in vascular anatomy among different individuals, and because the proximal insertion window 103 of the main stent 101 of the target stent 100 is adjustable, and the position of the branch stent 102 of the target stent 100 relative to the branch vessel 11 is adjustable, the probability of interference between the branch device 200 and the main stent 101 during the delivery of the branch device 200 can be effectively reduced, thus avoiding the risks of deformation, displacement, or kinking of the main stent 101.

[0054] The connecting structure 1100 can be positioned at a suitable location on the inner catheter 1000 as needed. For example, in one embodiment, the connecting structure 1100 can be positioned at the proximal end of the inner catheter 1000. The connection structure 1100 on the inner catheter 1000 can be directly or indirectly positioned. For example, a guide element 1300 is provided at the proximal end of the inner catheter 1000. The guide element 1300 has a tapered structure that facilitates guidance. In this case, the connecting structure 1100 is positioned on the guide element 1300, thereby indirectly positioned at the proximal end of the inner catheter 1000 through the guide element 1300.

[0055] When the connecting structure 1100 is directly installed on the inner conduit 1000, different connecting parts 1101 in the connecting structure 1100 can be located at different positions in the inner conduit 1000. For example, several connecting parts 1101 in the connecting structure 1100 can be distributed at different positions in the inner conduit 1000 along the circumferential direction. Therefore, when different binding threads 1201 are withdrawn, the target stent 100 can gradually unfold along the circumferential direction, thereby forming the aforementioned proximal penetration window 103 on the side of the target stent 100 as shown in FIG3. When the number of withdrawn binding threads 1201 is increased, the window area of ​​the aforementioned proximal penetration window 103 can also be gradually increased in the circumferential direction of the target stent 100. In order to ensure that the window area of ​​the proximal insertion window 103 is uniformly adjusted each time the binding wire 1201 is withdrawn, the circumferential spacing between all adjacent connecting parts 1101 in the connecting structure 1100 can be set to be the same when the inner conduit 1000 is distributed in the circumferential direction.

[0056] When the connecting structure 1100 is indirectly disposed on the inner catheter 1000, different connecting portions 1101 in the connecting structure 1100 can be located at different positions on the guiding element 1300. For example, several connecting portions 1101 in the connecting structure 1100 are distributed at different positions on the guiding element 1300 along the circumferential direction. Therefore, when different binding threads 1201 are withdrawn, the target stent 100 can be gradually unfolded along the circumferential direction, thereby forming the aforementioned proximal penetration window 103 on the side of the target stent 100 as shown in FIG. 3. When the number of withdrawn binding threads 1201 is increased, the window area of ​​the aforementioned proximal penetration window 103 can also be gradually increased in the circumferential direction of the target stent 100. In order to ensure that the window area of ​​the near-end threaded window 103 is uniformly adjusted each time the binding wire 1201 is withdrawn, the circumferential spacing between all adjacent connecting parts 1101 in the connecting structure 1100 can be set to be the same when the guiding element 1300 is distributed in the circumferential direction.

[0057] In addition, several connecting parts 1101 may also be arranged along the axial direction or other directions on the inner conduit 1000 or the guiding element 1300. Those skilled in the art can set the arrangement of several connecting parts 1101 according to actual needs, and no limitation is made here.

[0058] Furthermore, the connecting part 1101 can be configured as a binding hole located at the proximal end of the inner catheter 1000 or a binding hole located at the distal end of the guiding element 1300. The binding hole is used to pass through the binding thread 1201. In addition, the connecting part 1101 can also be configured as a connecting ring, a connecting protrusion, a connecting hook or other suitable structures, which are not limited here.

[0059] In one embodiment, the connection structure may include a first connection portion 1101, a second connection portion 1101, and a third connection portion 1101, which are uniformly distributed along the circumferential direction of the inner catheter 1000. The binding structure 1200 includes a first binding thread 1201, a second binding thread 1201, and a third binding thread 1201. The proximal end of the first binding thread 1201 is detachably connected to the first connection portion 1101, the proximal end of the second binding thread 1201 is detachably connected to the second connection portion 1101, and the proximal end of the third binding thread 1201 is detachably connected to the third connection portion 1101.

[0060] This application provides a conveying system including the aforementioned conveying components. Since the specific structure, functional principle, and technical effects of the conveying components have been described in detail above, they will not be repeated here. Any information regarding the conveying components can be found in the foregoing description. Simultaneously, the conveying system may also include the aforementioned target support 100 and branch device 200. The target support 100 is configured to be conveyed using the conveying components. The target support 100 includes a main support 101 and a branch support 102. The main support 101 has a support window, and the branch support 102 is connected to the support window of the main support 101, with the inner cavity of the branch support 102 communicating with the inner cavity of the main support 101 via the support window. The separation of at least one binding thread 1201 of the binding structure 1200 from the connecting portion 1101 is used to form a proximal penetration window 103 at the proximal end of the inner catheter 1000. The branching instrument 200 is used to enter the inner lumen of the inner catheter 1000 through the proximal penetration window 103, and pass through the inner lumen of the branching stent 102 and exit from the distal end of the branching stent 102.

[0061] 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.

[0062] 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 assembly, characterized in that, The conveying assembly includes: An internal catheter, wherein the internal catheter is provided with a connecting structure, the connecting structure including at least two connecting parts; An external conduit is movably sleeved outside the inner conduit. The inner wall of the external conduit and the outer wall of the inner conduit form a stent-accommodating space for accommodating the target stent. A restraint structure comprising at least two restraint threads for securing a target support, wherein each restraint thread is detachably connected to a connecting portion of the connecting structure.

2. The conveying assembly according to claim 1, characterized in that, The connecting structure is located at the proximal end of the internal catheter.

3. The conveying assembly according to claim 2, characterized in that, The different connecting parts in the connecting structure are located at different positions in the inner catheter.

4. The conveying assembly according to claim 3, characterized in that, The connecting parts in the connecting structure are distributed at different positions along the circumference of the inner conduit.

5. The conveying assembly according to claim 2, characterized in that, The proximal end of the internal catheter is provided with a guiding element, and the connecting structure is disposed on the guiding element, thereby indirectly disposed on the proximal end of the internal catheter through the guiding element.

6. The conveying assembly according to claim 5, characterized in that, The different connecting parts in the connection structure are located at different positions of the guiding element.

7. The conveying assembly according to claim 6, characterized in that, The connecting parts in the connecting structure are distributed at different positions on the guiding element along the circumferential direction of the guiding element.

8. The conveying assembly according to claim 7, characterized in that, In the circumferential direction of the inner conduit, the circumferential spacing between all adjacent connecting portions in the connecting structure is the same.

9. The conveying assembly according to claim 1, characterized in that, The connecting part is a binding hole located at the proximal end of the inner catheter, and the binding hole is used to pass through the binding thread.

10. The conveying assembly according to claim 1, characterized in that, The connecting part is a binding hole located at the distal end of the guiding element, and the binding hole is used to pass through the binding thread.

11. The conveying assembly according to claim 1, characterized in that, The connection structure includes a first connection part, a second connection part, and a third connection part, which are evenly distributed along the circumferential direction of the inner conduit.

12. The conveying assembly according to claim 11, characterized in that, The binding structure includes a first binding thread, a second binding thread, and a third binding thread. The proximal end of the first binding thread is detachably connected to the first connecting part, the proximal end of the second binding thread is detachably connected to the second connecting part, and the proximal end of the third binding thread is detachably connected to the third connecting part.

13. A conveying system, characterized in that, The conveying system includes the conveying components as described in any one of claims 1-12.

14. The conveying system according to claim 13, characterized in that, The conveying system includes: A target support, configured to be conveyed by the conveying assembly, the target support comprising a main support and a branch support, the main support having a support window, the branch support being connected to the support window of the main support, and the inner cavity of the branch support communicating with the inner cavity of the main support via the support window.

15. The conveying system according to claim 14, characterized in that, The conveying system includes: A branching device, wherein at least one binding thread of the binding structure is separated from the connecting portion to form a proximal penetration window at the proximal end of the inner catheter, the branching device being used to enter the lumen of the inner catheter through the proximal penetration window of the inner catheter, and to pass through the lumen of the branching stent and exit from the distal end of the branching stent.

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