Stent and interventional system

Abstract

This invention provides a stent and an interventional system. The stent includes at least two traction wires, at least two support posts, and a proximal connector. Each support post is connected to at least one traction wire, and the traction wire extends axially along the corresponding support post. Alternatively, the traction wire is located between at least two support posts and extends from the distal end of the support post towards the proximal end. The proximal connector is connected to the proximal end of each support post, and the free end of the traction wire extends into the proximal connector and is movable relative to the proximal connector to pull the support post and switch the stent's state. Therefore, the stent provided by this invention uses traction wires as the control element for adjusting the stent's state. That is, under the pulling of the traction wires, the axial extension and contraction of the support post can be achieved, thereby changing the expansion state of the support post to meet different tension requirements in long-term and short-term implantation, and the degree of expansion can be adjusted according to the patient's tolerance, enhancing the stent's adaptability.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and in particular to a stent and interventional system. Background Technology

[0002] Benign prostatic hyperplasia (BPH) is one of the most common benign diseases causing urinary obstruction in middle-aged and elderly men. It can be treated with conventional surgical procedures, such as transurethral resection of the prostate (TURP), transurethral incision of the prostate (TUIP), transurethral electrovaporization of the prostate (TUVP), plasma kinetic resection of the prostate (PKRP), and open prostatectomy. While these treatments can improve urinary symptoms in over 70% of BPH patients, most require general anesthesia and are prone to significant bleeding, making them less tolerated by older patients with obstruction. Furthermore, they can cause adverse effects such as retrograde ejaculation. Therefore, minimally invasive surgery to implant a stent to support the prostate tissue can ensure treatment effectiveness while avoiding the drawbacks of conventional surgery. However, long-term implantable stents currently on the market are prone to displacement, while short-term implantable stents have strong expansion forces that can cause patient discomfort and cannot meet the needs of different patients. Furthermore, existing stents have relatively complex structures and large contact areas with prostate tissue, which can easily cause significant irritation in patients, making stent implantation unsuitable for patients who cannot tolerate them.

[0003] Therefore, there is an urgent need for a new type of stent to improve the problems of existing stents. Summary of the Invention

[0004] The purpose of this invention is to provide a stent and interventional system to solve at least one of the following problems: how to improve the stability of long-term implanted stents, how to adjust the expansion force of short-term implanted stents, and how to reduce stent stimulation to patients and reduce patient discomfort.

[0005] To solve the above-mentioned technical problems, the present invention provides a bracket, comprising: at least two traction wires, at least two support columns, and a proximal connector;

[0006] Each of the support posts is connected to at least one of the traction lines, and the traction lines extend along the axial direction of the corresponding support post, and / or the traction lines are located between the at least two support posts and extend from the distal end of the support post toward the proximal end;

[0007] The proximal connector is connected to the proximal end of each of the support columns, and the free end of the traction line extends into the proximal connector and can move relative to the proximal connector to pull the support column and switch the state of the bracket.

[0008] Optionally, in the bracket, the support column has an inner cavity extending along its own axial direction, and the traction line extends into the inner cavity to extend along the axial direction of the support column.

[0009] Optionally, in the bracket, the connecting end of the traction wire is connected to the proximal end of the support column; the free end of the traction wire extends into the inner cavity and extends from the distal end of the support column, and extends in the opposite direction into the proximal connector.

[0010] Optionally, in the bracket, the connecting end of the traction line is connected to the distal end of the support column; the free end of the traction line extends into the inner cavity and protrudes from the proximal end of the support column, extending into the proximal connector.

[0011] Optionally, in the bracket, the connecting end of the traction line is connected to the distal end of the support column, and the free end of the traction line extends from the distal end of the support column into the proximal connector.

[0012] Optionally, in the bracket, the support column is arc-shaped.

[0013] Optionally, in the bracket, the proximal connector has a first connecting portion and a second connecting portion; the first connecting portion has a first through hole so that the first connecting portion is sleeved on the proximal end of the support column; the second connecting portion has a second through hole, and the inner wall of the second through hole is provided with at least one slot; wherein, at least one retaining ring is sleeved on the free end of the traction line; the retaining ring can abut against the slot so that the traction line is movably connected relative to the second connecting portion.

[0014] Optionally, in the bracket, the bracket includes three support columns; on the cross-section of the bracket, the three support columns are located at the 5 o'clock, 7 o'clock and 12 o'clock positions respectively.

[0015] Optionally, in the bracket, the bracket further includes a distal connector that is connected to the distal end of each of the support columns.

[0016] Based on the same inventive concept, the present invention also provides an interventional system, including the aforementioned stent.

[0017] In summary, this invention provides a stent and an interventional system. The stent includes at least two traction wires, at least two support posts, and a proximal connector. Each support post is connected to at least one traction wire, and the traction wire extends axially along the corresponding support post. Alternatively, the traction wire is located between the at least two support posts and extends from the distal end of the support post towards the proximal end. The proximal connector is connected to the proximal end of each support post, and the free end of the traction wire extends into the proximal connector and is movable relative to the proximal connector to pull the support post and switch the stent's state. Therefore, the stent provided by this invention uses the traction wires as a control element for adjusting the stent's state. That is, under the pulling of the traction wires, the axial extension and contraction of the support post can be achieved, thereby changing the expansion state of the support post to meet different tension requirements in long-term and short-term implantation, and the degree of expansion can be adjusted according to the patient's tolerance, enhancing the stent's adaptability. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of a bracket in an embodiment of the present invention.

[0019] Figure 2 This is a schematic diagram of the structure of a bracket in an embodiment of the present invention.

[0020] Figure 3 This is a schematic diagram of the structure of a bracket in an embodiment of the present invention.

[0021] Figure 4 This is a schematic diagram of the structure of a bracket in an embodiment of the present invention.

[0022] Figure 5 This is a schematic diagram of the structure of a bracket in an embodiment of the present invention.

[0023] Figure 6 This is a schematic diagram of the proximal connector in an embodiment of the present invention.

[0024] Figure 7 This is a cross-sectional view of the structure in an embodiment of the present invention, showing the free end connected to the second connecting part.

[0025] Figure 8 This is a schematic diagram of the structure of the remote connector in an embodiment of the present invention.

[0026] Figure 9 This is a schematic diagram of the support structure in the first state in an embodiment of the present invention.

[0027] Figure 10This is a schematic diagram of the support structure in the second state in an embodiment of the present invention.

[0028] The attached figures are labeled as follows:

[0029] 10-Bracket; 101-Traction line; 1011-Connecting end; 1012-Free end; 1013-Snap ring; 102-Support column; 103-Proximal connector; 1031-First connecting part; 1032-Second connecting part; 104-Distal connector; 1041-First joint; 1042-Second joint;

[0030] T1 - First through hole; T2 - Second through hole; T21 - Slot; T3 - Third through hole; T4 - Fourth through hole;

[0031] F1 - Tension; F2 - Thrust. Detailed Implementation

[0032] To make the objectives, advantages, and features of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that the drawings are all in a very simplified form and are not drawn to scale, only used to facilitate and clearly illustrate the objectives of the embodiments of the present invention. Furthermore, the structures shown in the drawings are often part of the actual structures. In particular, different figures may have different focuses and sometimes use different scales. It should also be understood that, unless specifically stated or indicated, the terms "first," "second," "third," etc., in the specification are only used to distinguish the various components, elements, steps, etc., in the specification, and are not used to indicate the logical or sequential relationships between the various components, elements, steps, etc. Also, the definitions of "proximal" and "distal" in this document are as follows: "distal" generally refers to the end of the medical device that first enters the patient's body during normal operation, while "proximal" generally refers to the end of the medical device that is closest to the operator during normal operation.

[0033] Please see Figure 1 and Figure 2 This embodiment provides a support 10, including: at least two traction wires 101, at least two support columns 102, and a proximal connector 103; each support column 102 is connected to at least one traction wire 101, and the traction wire 101 extends along the axial direction of the corresponding support column 102, and / or, the traction wire 101 is located between the at least two support columns 102 and extends from the distal end of the support column 102 toward the proximal end; the proximal connector 103 is connected to the proximal end of each support column 102, and the free end of the traction wire 101 extends into the proximal connector 103 and is movable relative to the proximal connector 103 to pull the support column 102 and switch the state of the support 10.

[0034] As can be seen, the stent 10 provided in this embodiment uses the traction line 101 as the control element for adjusting the state of the stent 10. That is, under the pulling of the traction line 101, the support column 102 can be stretched and contracted in the axial direction, thereby changing the expansion state of the support column 102 to meet different tension requirements in long-term and short-term implantation, and the degree of expansion can be adjusted according to the patient's tolerance, thereby enhancing the adaptability of the stent.

[0035] The following is in conjunction with the appendix Figures 1-10 The bracket 10 provided in this embodiment is described in detail.

[0036] Please see Figure 1 The stent 10 provided in this embodiment is implanted into the body to expand the tissue structure at the target location and form a channel. For example, the stent 10 is suitable for the treatment of benign prostatic hyperplasia (BPH). That is, by supporting the prostate tissue, it alleviates the problem of urethral obstruction. Further, the stent 10 includes a traction wire 101, a support post 102, and a proximal connector 103. The traction wire 101 is used to adjust the state of the stent 10 and maintain its shape. The support post 102 is the supporting framework of the stent 10, used to expand the tissue structure. The connector 103 is disposed at the proximal end of the support post 102, used to connect the traction wire 101 and the support post 102, and cooperates with the traction wire 101 to adjust the state of the stent 10 and maintain its shape. Preferably, the materials of the traction wire 101, the support post 102, and the proximal connector 103 include, but are not limited to, metallic materials or biopolymer materials. The support column 102 is preferably a shape memory alloy, such as nickel-titanium material.

[0037] In one embodiment, the support column 102 is a tube with an inner cavity extending along its own axial direction, and the traction line 101 extends into the inner cavity to extend along the axial direction of the support column 102. Figure 2As shown, the traction line 101 has two opposing ends, namely a connecting end 1011 and a free end 1012. The connecting end 1011 is fixedly connected to the distal end of the support column 102. The connection method includes, but is not limited to, welding, bonding, snap-fitting, and sewing. The free end 1012 of the traction line 101 extends along the inner cavity of the support column 102, passes from the distal end of the support column 102 to the proximal end of the support column 102, and then extends from the proximal end of the support column 102 into the proximal end connector 103. Based on this, by pulling the free end 1012 of the traction line 101, the distal end of the support column 102 can be moved closer to the proximal end of the support column 102. Understandably, when a tension F1 is applied to the free end 1012 of the traction line 101, the connection point between the connecting end 1011 of the traction line 101 and the distal end of the support column 102 is the direct point of force application for the traction line 101. This drives the distal end of the support column 102 towards the proximal end, causing the body of the support column 102 to bend in an arc shape, which can be a regular circular arc or an irregular arc. Simultaneously, the traction line 101 located within the inner cavity of the support column 102 will contact the cavity wall of the support column 102, thus increasing the force-bearing area of ​​the support column 102, resulting in the support column 102 being subjected to tension F1 at all points along its axial direction. Furthermore, the greater the tension F1, the greater the degree of arching of the support column 102, i.e., the greater the expansion of the bracket 10. In one embodiment, based on the materials of the traction wire 101 and the support column 102, the traction wire 101 has a certain rigidity and is capable of pushing the support column 102, so the free end 1012 can be subjected to a thrust F2. Correspondingly, the distal end of the support column 102 will extend away from the proximal end under the force of the traction wire 101. Moreover, the greater the thrust F2, the smaller the degree of arching of the support column 102, that is, the smaller the degree of expansion of the bracket 10. Obviously, compared with the deformation effect produced by the direct pushing and pulling of the rod, the deformation effect produced by the traction wire 101 passing through the inner cavity on the support column 102 is more balanced, which can make the support column 102 deform synchronously as a whole, rather than the shape abrupt change of some contact points, which is beneficial to improving the durability of the bracket 10 and ensuring the stability of the overall shape.

[0038] To further improve the stability of the applied force, at least one traction wire 101 that does not pass through the inner cavity can be provided at the distal end of the support column 102. Figure 1 and Figure 3As shown, the connecting end 1011 of the traction wire 101 is fixedly connected to the distal end of the support column 102. The connection method includes, but is not limited to, welding, bonding, snapping, and sewing. The free end 1012 of the traction wire 101 extends from the distal end of the support column 102 into the proximal connector 103. Specifically, the free end 1012 of the traction wire 101 does not penetrate into the inner cavity of the support column 102, but extends from the outside of the support column 102 towards the proximal end. Furthermore, the traction wire 101 is located within the area enclosed by the support columns 102, that is, the traction wire 101 is located between all the support columns 102. It is understood that applying a force to the traction wire 101 outside the support column 102 can also achieve the effect of changing the degree of bending of the support column 102. That is, when a tensile force is applied, the distal end of the support column 102 moves closer to the proximal end, causing the bracket 10 to gradually expand; when a thrust force is applied, the distal end of the support column 102 moves away from the proximal end, causing the bracket 10 to gradually contract. It should be noted that the traction wire 101 penetrating the inner cavity and the traction wire 101 disposed outside the support column 102 can be simultaneously provided at the distal end of the support column 102. Then, the free ends 1012 of all the traction wires 101 converging at the proximal connector 103 can be wound into a single rope to facilitate the uniform application of force, or force can be applied to each free end 1012 separately; this embodiment does not limit this. Furthermore, the traction wire 101 referred to in this embodiment can be a single filament in the art, or it can be a rope woven or wound from multiple filaments, possessing a certain rigidity.

[0039] Furthermore, this embodiment does not limit the connection position between the connecting end 1011 of the traction line 101 and the support column 102, and can be as follows: Figure 2 and Figure 3 The connecting end 1011 shown is fixed to the distal end of the support column 102, or it can be fixed at any position on the cavity wall of the support column 102, or as shown in the figure. Figure 4 It is fixed to the proximal end of the support column 102 as shown. Please refer to [link / reference]. Figure 4The connecting end 1011 of the traction wire 101 is fixedly connected to the proximal end of the support column 102. Optionally, a cover plate is provided at the proximal end of the support column 102 to close the opening at the proximal end of the support column 102, in which case the connecting end 1011 of the traction wire 101 can also be directly fixedly connected to the cover plate. The connection method includes, but is not limited to, welding, bonding, snap-fitting, and sewing. The free end 1012 of the traction wire 101 passes through the inner cavity of the support column 102 and extends from the distal end of the support column 102, extending in the opposite direction into the proximal connector 103. Specifically, the free end 1012 of the traction wire 101 enters the inner cavity of the support column 102 and extends along the inner cavity to the distal end of the support column 102, then extends out from the distal end, folds back from the distal end, and continues to extend to the proximal end of the support column 102 to enter the proximal connector 103. The free end 1012 extends from the distal end to the proximal end of the support column 102, bypassing the inner cavity of the support column 102, and directly extending from the distal end to the proximal end outside the support column 102. Therefore, Figure 4 The traction wire 101 shown not only passes through the inner cavity of the support post 102, but also returns from the outside of the support post 102 to the proximal end, which is equivalent to... Figure 3 Two traction lines 101 are provided at the distal end of the support column 102, one penetrating the inner cavity of the support column 102, and the other extending from the outside of the support column 102 from the distal end to the proximal end. Based on this, in order to... Figure 4 When the free end 1012 of the traction line 101 shown is subjected to force, the connection point between the proximal end of the support column 102 and the connection end 1011 of the traction line 101, the contact point between the traction line 101 and the cavity wall of the entire inner cavity, and the contact point between the traction line 101 and the distal end of the support column 102 are all force-bearing points, so as to ensure a relatively uniform overall deformation effect of the support column 102.

[0040] In another embodiment, the support column 102 is a wire and does not have an internal cavity. For example, the support column 102 is a solid metal rod or a metal rope woven from multiple metal wires. Figure 5As shown, when the support column 102 does not have an inner cavity, the traction line 101 is positioned in the middle of all the support columns 102, and the connecting end 1011 of the traction line 101 is connected to the distal end of the support column 102. The free end 1012 of the traction line 101 extends from the distal end of the support column 102 into the proximal connector 103. That is, the connecting end 1011 of the traction line 101 is fixedly connected to the distal end of the support column 102, and the free end 1012 of the traction line 101 extends from the distal end to the proximal end, passes through the area enclosed by all the support columns 102, and extends into the proximal connector 103. Based on this, when a force is applied to the support column 102, the connection point between the connecting end 1011 of the traction line 101 and the distal end of the support column 102 is the direct point of force application, thereby achieving a change in the shape of the support column 102.

[0041] Furthermore, this embodiment does not limit the number of support columns 102; there can be two, three, or more than four. However, to ensure the stability of the bracket 10 and the balanced support force, all support columns 102 are evenly distributed around the central axis of the bracket 10. For example, when three support columns 102 are provided, from the cross-section of the bracket 10, the three support columns 102 are located at the 5 o'clock, 7 o'clock, and 12 o'clock positions, respectively. Also, the proximal ends of all support columns 102 are connected to the proximal connector 103; the distal ends of all support columns 102 can be interconnected. Furthermore, each support column 102 can be provided with one or more traction lines 101. That is, several traction lines 101 can be threaded through the same inner cavity, and several traction lines 101 can also be connected to the outside of the same support column 102. And when multiple traction lines 101 converge, preferably, they are gathered or wound into a single line to facilitate the uniform application of force. Of course, a force can also be applied to the free end 1012 of each of the traction lines 101.

[0042] Please see Figure 1 and Figures 6-7 The proximal connector 103 has a first connecting portion 1031 and a second connecting portion 1032 that are in contact with each other. The first connecting portion 1031 has a first through hole T1; and the diameter of the first through hole T1 is the same as or slightly larger than the diameter of the proximal end of the support column 102, so that the proximal end of the support column 102 can be engaged in the first connecting portion 1031. That is, the first connecting portion 1031 is sleeved on the proximal end of the support column 102 to achieve a fixed connection between the support column 102 and the proximal connector 103. It should be noted that when the bracket 10 is provided with multiple support columns 102, each support column 102 is engaged in one of the first connecting portions 1031. For example, Figure 1The bracket 10 shown is provided with three support columns 102, then as follows Figure 6 As shown, the proximal connector 103 is provided with three first connecting portions 1031 at corresponding positions on the proximal end of the support column 102, so as to connect with the proximal ends of the three support columns 102 respectively. The three first connecting portions 1031 are fixedly connected; optionally, the connection method is laser welding or integral molding.

[0043] The second connecting portion 1032 has a second through hole T2, and the inner wall of the second through hole T2 is provided with at least one slot T21. When two or more slots T21 are provided, each slot T21 is equally spaced along the axial direction of the second connecting portion 1032. Further, at least one retaining ring 1013 is sleeved on the free end 1012 of the traction line 101, and the retaining ring 1013 is fixedly disposed on the outer periphery of the free end 1012 of the traction line 101. It should be noted that when the bracket 10 is provided with multiple traction lines 101, and the free ends 1012 of all the traction lines 101 are gathered or wound into a single force-bearing rope, the tension and thrust will act directly on the force-bearing rope, and the retaining ring 1013 is fixedly sleeved on the outer periphery of the force-bearing rope; correspondingly, the second connecting portion 1032 has a second through hole T2, so that the force-bearing rope can extend into the second through hole T2. When each or several traction wires 101 in the bracket 10 need to be individually force-controlled, the retaining ring 1013 is respectively sleeved on the outer periphery of the free end 1012 of the corresponding traction wire 101, or sleeved on the outer periphery of a force-bearing rope formed by combining several traction wires 101. Correspondingly, the number of second through holes T2 in the second connecting part 1032 is equal to the number of traction wires 101 and force-bearing ropes sleeved with the retaining ring 1013, so that the traction wires 101 and force-bearing ropes respectively extend into the corresponding second through holes T2.

[0044] in, Figure 7The example is a schematic diagram of a traction wire 101 extending into the second through hole T2. The four retaining rings 1013 on the free end 1012 are also evenly spaced and equidistant from each of the retaining slots T21. Furthermore, the retaining rings 1013 protrude from the outer surface of the traction wire 101 and / or the tension rope and can abut against the retaining slots T21. Specifically, when a tension force is applied to the free end 1012, each retaining ring 1013 located in the second connecting portion 1032 will extend beyond its current retaining slot T21 into a retaining slot T21 closer to the proximal end. And when the tension force increases, each retaining ring 1013 will extend beyond multiple retaining slots T21 to get closer to the proximal end. Conversely, when a thrust is applied to the free end 1012, each of the retaining rings 1013 located in the second connecting portion 1032 will extend beyond one or more of the retaining grooves T21 into a groove T21 closer to the distal end. Specifically, when the retaining ring 1013 is located within the groove T21 and no force is applied to the free end 1012, the retaining ring 1013 will be fixedly embedded in its respective groove T21, ensuring the position of the traction line 101 relative to the proximal connector 103 is fixed, thereby ensuring the morphological stability of the bracket 10. Based on this, it can be understood that when it is necessary to increase the expansion force of the bracket 10, the free end 1012 of the traction line 101 can be pulled so that the retaining ring 1013 is embedded in the retaining groove T21 closer to the proximal end; when it is necessary to reduce the expansion force of the bracket 10, the free end 1012 of the traction line 101 can be pushed so that the retaining ring 1013 is embedded in the retaining groove T21 closer to the distal end. Therefore, the bracket 10 provided in this embodiment, through the movable connection between the traction line 101 and the second connecting part 1032, can not only adjust the degree of expansion of the bracket 10, but also maintain the stability of the shape of the bracket 10 after adjustment.

[0045] Furthermore, the second connecting portion 1032 can be disposed in the middle of each of the first connecting portions 1031, or it can be disposed near the proximal end of each of the first connecting portions 1031. For example, when the free end 1012 of the traction wire 101 extends from the proximal end of the support column 102 through the inner cavity, if the second connecting portion 1032 is located in the middle, a communicating hole is provided between the first connecting portion 1031 and the second connecting portion 1032 to ensure that the free end 1012 of the traction wire 101 can extend into the second connecting portion 1032; or the second connecting portion 1032 is disposed near the proximal end of the first connecting portion 1031 so that the first through hole T1 communicates with the second through hole T2. When the free end 1012 of the traction wire 101 extends from the outside of the support column 102 to its proximal end, preferably, the second connecting portion 1032 is disposed in the middle of each of the first connecting portions 1031, that is, located on the central axis of the bracket 10.

[0046] like Figure 1 and Figure 8 As shown, to ensure further stability of the structure, the bracket 10 can also be provided with a distal connector 104. The distal end of each support column 102 is connected to the distal connector 104. Optionally, the distal connector 104 has a first connector 1041 and a second connector 1042. The first connector 104 has a third through hole T3, and the distal end of the support column 102 can be engaged in the third through hole T3 to achieve a fixed connection between the support column 102 and the distal connector 104. Similar to the first connecting portion 1031 in the proximal connector 103, the number of first connectors 1041 is the same as the number of support columns 102, so that the distal end of each support column 102 is inserted into the corresponding first connector 1041. The second connector 1042 has a fourth through hole T4, and the traction line 101 can extend towards the proximal end of the support column 102 through the fourth through hole T4. Optionally, in Figure 2 , Figure 3 and Figure 5 In the bracket 10 shown, the second connector 1042 can be directly connected to the connection end 1011 of the traction line 101 as an extension of the support column 102; or, the connection end 1011 of the traction line 101 extends into the third through hole T3 through the fourth through hole T4 and then connects to the distal end of the support column 102. Preferably, all the first connectors 1041 and the second connectors 1042 are fixedly connected, and the second connector 1042 is disposed in the middle of each of the first connectors 1041 and located on the central axis of the bracket 10.

[0047] Based on the same inventive concept, this embodiment also provides an interventional system, including the stent 10. Furthermore, the interventional system also includes a delivery tube for delivering the stent 10, a push rod, and other delivery devices. Therefore, before implanting the stent 10, the free end 1012 of the traction wire 101 needs to be connected to the push rod, and the push rod is used to push and pull the free end 1012 of the traction wire 101 to form... Figure 9 The first state is shown. In this first state, the expansion degree of the stent 10 is not high, which is suitable for patients with long-term implantation needs; alternatively, after implantation, the expansion degree of the stent 10 can be increased by pulling the free end 1012, so that the stent 10 forms... Figure 10 The second state shown is to meet the needs of short-term implantation. Of course, for patients who need short-term implantation, the free end 1012 can be pulled directly before implantation to make the stent 10 present in the second state before implantation. After completing the connection between the stent 10 and the push rod, the stent 10 is compressed and placed in the delivery tube, then the stent 10 is delivered to the target position and released. Because the support column 102 in the stent 10 has shape memory, the stent 10 quickly expands to the state before compression after release. Then, the operator can adjust the expansion force of the stent 10 according to the patient's tolerance and the degree of obstruction. That is, by applying a pushing or pulling force to the free end 1012 through the push rod, the state of the stent 10 can be changed between the first state and the second state, or beyond the first state and the second state. Finally, after adjusting the state of the stent 10, the delivery device is withdrawn. Furthermore, during the removal of the support 10, the expansion of the support 10 can be reduced by pushing the free end 1012, gradually forming a state of radial contraction and axial expansion, which facilitates the recovery of the support 10 into the delivery pipe and reduces the operational difficulty of recovering the support 10.

[0048] according to Figure 9 and Figure 10It is known that the expansion degree of the stent 10 in the second state is greater than that in the first state. That is, the tensile force applied by the free end 1012 in the second state is greater than that applied by the free end 1012 in the first state, or the thrust applied by the free end 1012 in the second state is less than that applied by the free end 1012 in the first state. It can be understood that the greater the applied tensile force, the closer the distal end of the stent 10 is to its proximal end, and the greater the expansion force of the stent 10; and the greater the applied thrust, the farther the distal end of the stent 10 is from its proximal end, and the smaller the expansion force of the stent 10. Among them, the expansion force of the stent 10 in the second state is significantly greater than that in the first state, which has a better effect on structural remodeling and pressure necrosis, and can significantly improve the problem of prostatic stenosis. The stent 10 in the first state causes less stimulation to the patient and is suitable for long-term implantation. In addition, the stent 10 provided in this embodiment preferably has three support columns 102 to reduce the contact area with the body tissues and further reduce the patient's irritation.

[0049] In summary, the stent 10 and interventional system provided in this embodiment adjust the expansion force of the stent 10 through the traction line 101. That is, under the pushing and pulling action of the traction line 101, the support column 102 can be stretched or contracted axially, thereby changing the expansion state of the support column 102 to meet different tension requirements in long-term and short-term implantation. Furthermore, the degree of expansion can be adjusted according to the patient's tolerance. In addition, under the tensile stress provided by the traction line 101, the stent 10 maintains morphological stability and is less prone to displacement due to deformation, thus improving implantation stability.

[0050] Furthermore, it should be understood that although the present invention has been disclosed above with reference to preferred embodiments, these embodiments are not intended to limit the present invention. For any person skilled in the art, many possible variations and modifications can be made to the technical solutions of the present invention based on the disclosed technical content, or equivalent embodiments can be modified accordingly, without departing from the scope of the present invention. Therefore, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention, without departing from the content of the present invention, shall still fall within the scope of protection of the present invention.

Claims

1. A stent, characterized by, include: At least two traction lines, at least two support posts, and a near-end connector; The support column has an inner cavity extending along its own axial direction; each support column is connected to at least one of the traction lines; wherein, All of the traction wires extend into the inner cavity of the corresponding support column to extend axially along the corresponding support column; or, a portion of the traction wires extend into the inner cavity of the corresponding support column to extend axially along the corresponding support column, and the remaining portion of the traction wires is located between the at least two support columns and extends from the distal end of the support column toward the proximal end. The proximal connector is connected to the proximal end of each of the support columns, and the free end of the traction line extends into the proximal connector and can move relative to the proximal connector to pull the support column and switch the state of the bracket.

2. The bracket according to claim 1, characterized in that, When the traction line extends into the inner cavity of the corresponding support column, the connecting end of the traction line is connected to the proximal end of the support column; the free end of the traction line extends into the inner cavity, extends out from the distal end of the support column, and extends in the opposite direction into the proximal connector.

3. The bracket according to claim 1, characterized in that, When the traction line extends into the inner cavity of the corresponding support column, the connecting end of the traction line is connected to the distal end of the support column; the free end of the traction line extends into the inner cavity, extends from the proximal end of the support column, and extends into the proximal connector.

4. The bracket according to claim 1, characterized in that, When the traction line is located between the at least two support columns, the connecting end of the traction line is connected to the distal end of the support column, and the free end of the traction line extends from the distal end of the support column into the proximal connector.

5. The bracket according to claim 1, characterized in that, The support column is arc-shaped.

6. The bracket according to claim 1, characterized in that, The proximal connector has a first connecting portion and a second connecting portion; the first connecting portion has a first through hole so that the first connecting portion is sleeved on the proximal end of the support column; the second connecting portion has a second through hole, and the inner wall of the second through hole is provided with at least one slot; wherein, at least one retaining ring is sleeved on the free end of the traction line; the retaining ring can abut against the slot so that the traction line is movably connected relative to the second connecting portion.

7. The bracket according to claim 1, characterized in that, The bracket includes three support columns; on the cross-section of the bracket, the three support columns are located at the 5 o'clock, 7 o'clock and 12 o'clock positions respectively.

8. The bracket according to claim 1, characterized in that, The bracket also includes a distal connector that is connected to the distal end of each of the support columns.

9. An intervention system, characterized in that, The interventional system includes a stent as described in any one of claims 1 to 8.

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