Stent conveying device

Abstract

The invention provides a stent conveying device which comprises a medical stent and a guide-in sheath, the medical stent is used for being stored in a natural state, a plurality of connecting devices are arranged at the near end of the medical stent in the circumferential direction, each connecting device is connected with a conductive wire, and an electrolysis release point is formed between each connecting device and the corresponding conductive wire. The medical stent stored in a natural state can be pulled into the introduction sheath by a number of conductive wires to enter the microcatheter. Thus, the problem that the performance of the stent is reduced due to the fact that the medical stent is affected by aging due to too long compression time is solved, the medical stent can be conveyed in place through simple push-and-pull actions before an operation, operation is easy and convenient, and operation convenience is guaranteed.

Description

Technical Field

[0001] The invention belongs to the field of medical devices, and in particular relates to a stent delivery device. Background Art

[0002] With the improvement of domestic living standards and the advancement of medical diagnostic technology, the incidence of vascular diseases caused by abnormal changes or aging of blood vessels is also increasing year by year, and the manifestations include intracranial aneurysms, visceral aneurysms and peripheral aneurysms, arteriovenous malformations and hemangiomas. For such diseases, the treatment options adopted at home and abroad mainly include surgical treatment and interventional treatment. Due to the huge trauma and a series of complications caused by surgical treatment, endovascular interventional minimally invasive treatment options are increasingly favored by doctors and patients. Blood flow guidance devices, also known as dense mesh stents, are implanted in the aneurysm-bearing arteries of large or giant aneurysms to change hemodynamics and achieve complete embolism or thrombosis to achieve the treatment purpose. In the treatment of wide-necked aneurysms, since simple coil embolization cannot be achieved, aneurysm embolization treatment is also completed by using coils in combination with auxiliary stents.

[0003] However, all current stents are pre-installed in an introduction sheath in a compressed state for storage. When in use, clinicians directly push the stent in the introduction sheath into the microcatheter, which is convenient for doctors to operate. Although this method can achieve operational convenience, the radial support force, opening performance or stent morphology of the stent are often easily affected, especially after long-term storage. Whether it is a metal braided stent or a polymer braided stent, after transportation or 2-3 years of storage, it may experience harsh conditions such as high temperature and high altitude, and the performance of the stent cannot be guaranteed.

[0004] Therefore, for those skilled in the art, how to design a stent delivery device that does not require storing medical stents in a compressed state is a technical problem that urgently needs to be solved.

[0005] It should be noted that the information disclosed in the background technology section of this application is only intended to deepen the understanding of the general background technology of this application, and should not be regarded as an admission or suggestion in any form that the information constitutes prior art already known to those skilled in the art. Summary of the invention

[0006] The purpose of the present invention is to provide a stent delivery device to overcome the above-mentioned defects, so that the medical stent can be stored in a natural state. Only when the medical stent needs to be implanted, the natural medical stent is loaded into an introduction sheath and then sent into a microcatheter for surgery.

[0007] To achieve the above-mentioned purpose, the present invention provides a stent delivery device, which includes a medical stent and an introduction sheath. The medical stent is used to be stored in a natural state. A plurality of connecting devices are circumferentially arranged on the proximal upper end of the medical stent. Each of the connecting devices is connected to a conductive wire. An electrolysis release point is formed between each of the connecting devices and the corresponding conductive wire. The medical stent stored in a natural state can be pulled into the introduction sheath by the plurality of conductive wires to enter the microcatheter.

[0008] Optionally, the connecting device is a developable structure.

[0009] Optionally, the medical stent is a braided stent, and the connecting device is arranged in a parallel wire region at the proximal end of the medical stent.

[0010] Optionally, all the connecting devices are evenly arranged along the circumferential direction on the proximal end of the medical stent.

[0011] Optionally, the number of the connecting devices is 2 to 16, more preferably 2 to 8.

[0012] Optionally, the length of the connecting device is 0.2 mm to 2 mm, and the radial dimension is 0.05 mm to 1.0 mm.

[0013] Optionally, the length of the electrolysis release point is 0.2 mm to 1.0 mm, and / or the radial dimension of the electrolysis release point is 0.001 in to 0.004 in.

[0014] Optionally, the radial dimension of the conductive wire is 0.002 in to 0.005 in.

[0015] Optionally, at least part of the connecting devices are staggered in the axial direction of the medical stent.

[0016] Optionally, the connecting device is one of a developing spring, a developing clamping ring and a developing sleeve.

[0017] Optionally, it also includes a pushing tube, the distal ends of all the conductive wires are connected to the corresponding connecting devices, the proximal ends of all the conductive wires are inserted into the pushing tube, the proximal ends of all the conductive wires extend to the proximal end of the pushing tube and are connected to the proximal end of the pushing tube, and when the electrolysis release point is released, part of the structure of the pushing tube is negatively charged, and all the conductive wires are positively charged.

[0018] Optionally, the push tube has a first part and a second part which are arranged along its own axial direction and kept insulated, the conductive wire passed through the first part is kept insulated from the first part, and the conductive wire passed through the second part is connected to the second part through its proximal end and is electrically conductive, and when the electrolytic release point is released, the first part is negatively charged, and all the conductive wires and the second part are positively charged.

[0019] Optionally, the proximal ends of all the conductive threads are connected as a whole to form a binding area.

[0020] Optionally, the distance from the binding area of ​​each conductive thread to the corresponding electrolysis release point is 1.0 mm to 10 mm.

[0021] Optionally, a bell mouth is provided at the distal end of the introduction sheath, and the medical stent in a natural state is used to be introduced into the introduction sheath through the bell mouth.

[0022] As described above, the present invention provides a stent delivery device that can store a medical stent in a natural state. In this way, the medical stent is configured to have a plurality of connection devices on the circumferential edge of the proximal end, each connection device is connected to a conductive wire, and an electrolytic release point is formed between each connection device and the corresponding conductive wire. When the medical stent needs to be implanted, the medical stent stored in the natural state can be pulled into an introduction sheath through a plurality of conductive wires, and then enter the microcatheter through the introduction sheath for surgery. After the medical stent is pushed out of the microcatheter and released, it can be released through the electrolytic release point. In this way, the time that the medical stent undergoes compression is only from before the surgical implantation to after the surgery, avoiding the problem that the performance of the medical stent is reduced due to aging caused by excessive compression time. Such a stent delivery device can deliver the medical stent to the desired position by a simple push-pull action before the operation. The operation is simple and convenient, ensuring the convenience of operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Those skilled in the art will appreciate that the accompanying drawings are provided for a better understanding of the present invention and do not constitute any limitation on the scope of the present invention.

[0024] Figure 1 is a schematic structural diagram of a stent delivery device according to an embodiment of the present invention;

[0025] Figure 2 is a schematic structural diagram of a medical stent at the proximal end of an embodiment of the present invention;

[0026] Figure 3 It is a structural schematic diagram of a medical stent according to an embodiment of the present invention, in which a connecting device, a conductive wire and an electrolytic release point are provided at the proximal end;

[0027] Figure 4is a schematic structural diagram of the push tube and the conductive wire associated with an embodiment of the present invention;

[0028] Figure 5 This is a state diagram of the medical stent according to an embodiment of the present invention just being pulled into the introduction sheath;

[0029] Figure 6 is a state diagram of the medical stent according to an embodiment of the present invention being completely pulled into the introduction sheath;

[0030] Figure 7 This is a schematic diagram of a medical stent according to an embodiment of the present invention when the conductive wire is positively charged and a part of the structure of the push tube is negatively charged when the medical stent is released;

[0031] Figure 8 is a schematic diagram showing that the connection device and the conductive wire on the proximal end of the medical stent according to an embodiment of the present invention have been released;

[0032] Fig. 9 It is a schematic diagram of the structure of the medical stent after release according to an embodiment of the present invention.

[0033] The symbols in the accompanying drawings are as follows:

[0034] 100-stent delivery device; 110-medical stent; 111-proximal end of the medical stent; 112-connecting device; 113-distal end of the medical stent; 114-conductive wire; 115-electrolysis release point; 116-push tube; 117-conductive contact; 118-first part; 119-second part; 130-introduction sheath; 131-bell mouth; a-portion where the conductive wire is passed through the first part; b-portion where the conductive wire is passed through the second part. DETAILED DESCRIPTION

[0035] In order to make the objects, advantages and features of the present invention clearer, the present invention is further described in detail below in conjunction with 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, and are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present invention. In addition, the structure shown in the drawings is often a part of the actual structure. In particular, the emphasis required to be shown in each drawing is different, and sometimes different proportions are used. As used in this specification, the singular forms "one", "an" and "the" include plural objects, unless the content clearly indicates otherwise. As used in this specification, the term "or" is generally used in a sense that includes "and / or", unless the content clearly indicates otherwise.

[0036] The "circumferential direction" mentioned in this application document refers to the direction around the central axis of the medical stent, the "axial direction" refers to the direction along the central axis of the medical stent, and the "radial direction" refers to the direction perpendicular to the axial direction. The natural state mentioned herein refers to the state in which the medical stent is naturally unfolded when not constrained by external forces, and the compressed state or gripped state refers to the state in which the medical stent is radially contracted and axially elongated when constrained by external devices (such as introduction sheaths, microcatheters, etc.).

[0037] In the prior art, medical interventional devices are often delivered to the lesion site through minimally invasive surgery. When not in use, the stent needs to be compressed in the introduction sheath, so that the clinician can directly push the stent into the microcatheter through the introduction sheath for surgery. However, after long-term compression and gripping, the stent may produce some plastic deformation, resulting in difficulties in opening the stent, the stent diameter cannot be restored to the predetermined state, the stent radial support force is lost, the stent is displaced, and other problems. In particular, for stents containing polymer materials or completely woven or cut from polymer materials, catastrophic consequences may occur.

[0038] Therefore, the present invention proposes a stent delivery device, including a medical stent and an introduction sheath. Through the cooperation of the medical stent and the introduction sheath, it is convenient for the operator (i.e., medical staff) to pull the medical stent in a natural state into the introduction sheath by themselves before clinical surgery, and then deliver the medical stent into the microcatheter through the introduction sheath. In this way, the influence of long-term compression and grip on the performance of the stent can be avoided, and it is convenient for the operator to deliver the stent to the position through simple operations before the operation. The requirements for the operator are not high, the operation is convenient, and the operation difficulty is low; at the same time, it is also convenient for the operator to conduct a comprehensive observation of the stent before the operation to confirm the integrity and availability of the stent, thereby ensuring the safety and effectiveness of the use of the stent.

[0039] The following description is given with reference to the accompanying drawings.

[0040] like Figures 1 to 3 As shown, the present invention relates to a stent delivery device 100, comprising a medical stent 110 and an introduction sheath 130. When implanting the medical stent 110, the medical stent 110 stored in a natural state is pulled into the introduction sheath 130 from the distal end (the distal end is usually provided with a flared mouth 131) of the introduction sheath 130, and when the medical stent 110 is completely pulled into the introduction sheath 130, it is compressed, and then the medical stent 110 in a compressed state is directly introduced into the microcatheter through the introduction sheath 130 for surgery.

[0041] The medical stent 110 involved in the present invention is a braided stent or a cutting stent, and a degradable stent or a non-degradable stent can be used. In the present embodiment, the medical stent 110 is a braided stent, which is a mesh structure formed by cross-weaving of multiple braided wires. The medical stent 110 has a relative proximal end 111 and a distal end 113. The proximal end 111 and the distal end 113 of the medical stent 110 can both be open, but are not limited to this, for example, the proximal end 111 and the distal end 113 are both closed or one is closed. In the present embodiment, the proximal end 111 and the distal end 113 of the medical stent 110 are both open, and there is no restriction on the form of any opening, such as a straight opening or a trumpet-shaped opening. The medical stent 110 can be used to treat a variety of medical conditions, including but not limited to the treatment of aneurysms.

[0042] The introduction sheath 130 of the present invention is an existing structure, and its distal end is usually provided with a bell mouth 131. The diameter (including the outer diameter and the inner diameter) of the bell mouth 131 gradually increases from the proximal end to the distal end of the introduction sheath 130. The bell mouth 131 is used to cooperate with the proximal end of the microcatheter. In this way, the medical stent 110 in a natural state can be introduced into the introduction sheath 130 through the bell mouth 131.

[0043] In order to enable the medical stent 110 to be stored in a natural state, a plurality of connecting devices 112 are provided along the circumferential direction at the proximal end 111 of the medical stent 110, and the number of connecting devices 112 is at least two, preferably three or more. The connecting device 112 is used to connect with the conductive wire 114. Furthermore, if the medical stent 110 is a braided stent, the connecting device 112 can also be used to restrain and fix the braided wire at the proximal end 111 of the medical stent 110 to prevent the braided wire from loosening. It should also be noted that the fixing method of the braided wire head at the proximal end 111 of the braided stent includes but is not limited to parallel wire fixing. In this way, the medical stent 110 also includes a conductive wire 114. The conductive wire 114 is used not only to transmit current, but also to replace the existing conveying guide wire to push and pull the medical stent 110, so that the diameter of the medical stent 110 after being pressed and gripped is smaller and easier to enter the catheter with a smaller inner cavity and a smaller blood vessel.

[0044] Each connecting device 112 is connected to a conductive wire 114, and an electrolytic release point 115 is provided between each conductive wire 114 and the corresponding connecting device 112. It is understandable that the function of the connecting device 112 is to achieve the connection between the proximal end 111 of the medical stent 110 and the conductive wire 114. The electrolytic release point 115 is a region that is disconnected by energizing, for example, an electroactive material can be used to connect the conductive wire 114 and the connecting device 112. Thus, the medical stent 110 stored in a natural state can be pulled into the introduction sheath 130 by a number of conductive wires 114 to enter the microcatheter, and after the medical stent 110 is pushed out of the microcatheter and released, it can be released again through the electrolytic release point 115 to achieve the separation of the conductive wire 114 from the connecting device 112. In this way, the time that the medical stent 110 undergoes compression is only from before the surgical implantation to after the surgery, avoiding the problem that the medical stent 110 is affected by aging due to the long compression time, resulting in the deterioration of the stent performance. Such a stent delivery device 100 can deliver the medical stent 110 to the desired position by simple pushing and pulling actions before surgery. The operation is simple and convenient, thus ensuring the convenience of operation.

[0045] In some embodiments, the connecting device 112 is a developable structure, that is, the connecting device 112 is made of a radiopaque material, such as platinum tungsten, platinum iridium or other common medical radiopaque materials. In this way, the proximal end 111 of the medical stent 110 can be developed by developing the connecting device 112 under X-rays, so as to confirm the position and opening state of the proximal end 111 of the medical stent 110. Optionally, the connecting device 112 is arranged at the parallel wire area (double wire parallel wire) at the proximal end 111 of the medical stent 110 to constrain and fix the braided wires in the parallel wire area.

[0046] The connecting device 112 can be any developable structure that can wrap, bind and fix the braided wire, such as a developing spring, a developing clip, a developing sleeve or other structures, and this application is not limited to this. In the embodiment shown, the connecting device 112 is a developing spring, and it is only necessary to spirally wind the metal developing wire around the double wire. Of course, the fixing method of the connecting device 112 is not limited to this, as long as the connecting device 112 can be fixed at the proximal end 111 of the medical stent 110. In this embodiment, the connecting device 112 can be connected to the braided wire in one piece or in a separate piece.

[0047] The connecting devices 112 are evenly distributed on the proximal end 111 of the medical stent 110, so that all the connecting devices 112 are evenly arranged along the circumference on the proximal end 111 of the medical stent 110. In this way, the medical stent 110 is evenly stressed during the introduction process, is not easily deformed or damaged, and can reduce the difficulty of loading.

[0048] The size of the connecting device 112 should not be too large, otherwise it will affect the implantation performance of the medical stent 110, and it will not be easy to load the medical stent 110 into the introduction sheath 130 and the microcatheter. Preferably, the length of the connecting device 112 is 0.2 mm to 2 mm, and the radial size (mainly the outer diameter) is 0.05 mm to 1.0 mm; when the connecting device 112 is designed according to this size, the size of the connecting device 112 is not increased without increasing the process difficulty, and the medical stent 110 is not affected from entering the introduction sheath 130 and the microcatheter.

[0049] Too many connecting devices 112 will also affect the implantation performance of the medical stent 110, and it is not easy to load the medical stent 110 into the introduction sheath 130 and the microcatheter. For this reason, preferably, the number of connecting devices 112 is 2 to 16. When this number of connecting devices 112 is used, the medical stent 110 is not easily damaged when the medical stent 110 is introduced, and each conductive wire 114 can be stressed at the same time, so that the medical stent 110 is smoothly pulled into the introduction sheath 130. More preferably, the number of connecting devices 112 is 2 to 8, so as to have better pushing performance and not increase the size too much.

[0050] The connecting devices 112 are distributed at intervals along the circumference of the medical stent 110. In some embodiments, all the connecting devices 112 are basically distributed on the same circumference along the circumference of the medical stent 110, so that they are neatly arranged without misalignment. In other embodiments, at least part of the connecting devices 112 are staggered in the axial direction of the medical stent 110, so that at least part of the connecting devices 112 are not on the same circumference. In this case, a non-uniform and misaligned arrangement is adopted, and then when the medical stent 110 is compressed, the cross-sectional area occupied by the connecting devices 112 is smaller, which is conducive to the connecting devices 112 entering a smaller introduction sheath 130 or microcatheter. Figure 2 As shown, in this embodiment, there are four connecting devices 112, two of which are arranged on the same circumference, and the other two connecting devices 112 are arranged on another circumference, thereby staggering the arrangement in the axial direction to facilitate reducing the radial dimension during compression. It should be understood that the staggered distribution in the axial direction means that the connecting devices 112 are arranged at different positions along the axial direction rather than on the same circumference.

[0051] The electrolysis release point 115 is generally an electroactive section with a certain length. In actual use, in order to complete the electrolysis release in a timely and smooth manner, the electrolysis release point 115 does not need to be set too long, which will increase the release time and the probability of electrolysis release failure. Therefore, the length of the electrolysis release point 115 is preferably 0.2mm to 1.0mm. If it exceeds 1.0mm, the above-mentioned problems are likely to occur. If it is less than 0.2mm, not only is the process difficult, but also the reliability and effectiveness will be reduced.

[0052] Further, considering the performance in terms of force, the electrolysis release point 115 should not be set too thin, otherwise, when pushing and pulling the medical stent 110, it is easy to bend, bend, or even break at the electrolysis release point 115. In this way, the radial size (such as diameter) of the electrolysis release point 115 is preferably 0.001in~0.004in, which can ensure the strength of the electrolysis release point 115 during the pushing process, and at the same time ensure that the electrolysis release point 115 completes electrochemical corrosion within a few seconds to tens of seconds after power is turned on, and achieves release. Preferably, the electrolysis release point 115 completes electrochemical corrosion within 3 seconds to 20 seconds after power is turned on, and achieves release.

[0053] The conductive wire 114 can be a conventional conductive wire, preferably a conductive wire structure with certain toughness and bending performance. The outer layer of the conductive wire 114 is wrapped with an insulating material, and the outer diameter of the conductive wire 114 after being wrapped with the insulating material is preferably 0.002in to 0.005in, which can ensure that the medical stent 110 can be smoothly pulled into the introduction sheath 130 and then enter the microcatheter.

[0054] Preferably, the distal ends of all the conductive wires 114 are connected to the connecting device 112 and then extended to the proximal end for a certain length before being bound and connected as a whole to form a binding area. In this way, when pushing and pulling the medical stent 110, all the conductive wires 114 can be stressed together to avoid uneven stress, thereby reducing the risk of breakage, damage, etc. of the medical stent 110 due to uneven stress, and ensuring that the medical stent 110 is evenly stressed, deformed and contracted and pulled into the introduction sheath 130. Preferably, the distance from the binding area of ​​each conductive wire 114 to the corresponding electrolysis release point 115 is 1.0 mm to 10 mm. When it exceeds 10.0 mm, the risk of uneven stress will increase, and when it is less than 1.0 mm, it is easy to affect the electrolysis release point 115. Here, the distance from the binding area to the electrolysis release point 115 should be understood as the distance along the axial direction of the medical stent 110 in the natural state.

[0055] like Figure 1 and Figure 4 As shown, in some embodiments, the stent delivery device 100 also includes a push tube 116, and the distal ends of all the conductive wires 114 are connected to the corresponding connecting devices 112, and at the same time, the proximal ends of all the conductive wires 114 penetrate into the push tube 116, and the proximal ends of all the conductive wires 114 also extend to the proximal end of the push tube 116 and are connected to the proximal end of the push tube 116. In this way, when the electrolytic release point 115 is released, part of the structure of the push tube 116 is negatively charged, and all the conductive wires 114 are positively charged, and then at each electrolytic release point 115 of the proximal end 111 of the medical stent 110 and the distal end of the push tube 116, an electrical circuit is formed by using blood or saline, so that electrochemical corrosion of the electrolytic release point 115 can be achieved. It should be understood that after the proximal end of the conductive wire 114 is connected to the proximal end of the push tube 116, a conductive contact 117 is formed at the connection position (see Figure 4), and the portion of the push tube 116 that is electrically connected to the conductive wire 114 is insulated from the portion of the push tube 116 that is not electrically connected to the conductive wire 114.

[0056] Furthermore, if Figure 4 As shown, the push tube 116 has a first part 118 and a second part 119 which are arranged along its own axial direction and are kept insulated, and the first part 118 is closer to the medical stent 110 than the second part 119. Among them, the conductive wire 114 inserted in the first part 118 is kept insulated from the first part 118, and the conductive wire 114 inserted in the second part 119 is connected to the second part 119 through its proximal end and electrically connected to form a conductive contact 117. In this way, when the electrolytic release point 115 is released, the first part 118 is negatively charged, and all the conductive wires 114 and the second part 119 are positively charged. Specifically, the part a of each conductive wire 114 in the first part 118 is wrapped with an insulating layer to ensure the insulation performance between the first part 118, and the part b of each conductive wire 114 in the second part 119 is not provided with an insulating layer and is exposed so as to be electrically connected with the second part 119. The first portion 118 is usually longer to be used as a main body, and the second portion 119 is usually a shorter section, and the diameter of the first portion 118 is larger than the diameter of the second portion 119. Thus, the proximal end of the push tube 116 is the second portion 119.

[0057] In the present invention, the push tube 116 is not only used for energizing, but also for enhancing the strength of the conductive wire 114, so as to facilitate pushing the medical stent 110. In this way, the medical stent 110 is stored in a natural state, and is temporarily pulled into the introduction sheath 130 before surgery, and then enters the microcatheter, and the medical stent 110 is released after being pushed out of the microcatheter. After the medical stent 110 is released, each electrolytic release point 115 is released through an external release device, and finally the medical stent 110 is fully released.

[0058] Preferably, the distance between the farthest end of the push tube 116 (i.e., the farthest end of the first part 118) and the electrolysis release point 115 is 0.1 mm-10 mm, so that electrolysis is easily achieved. More preferably, the distance is 0.1 mm-3 mm, which makes it easier to form a path through the blood and achieve electrolysis. The distance here is also the distance along the axial direction of the medical stent 110 in the natural state. The push tube 116 can be selected as a hypotube or other pipe material, which is not limited by the present invention.

[0059] Combine the following Figures 5 to 9 , a more detailed description of the delivery method of the medical stent 110 is given.

[0060] like Figure 5 As shown, during surgery, the medical stent 110 stored in a natural state is pulled into the introduction sheath 130 through the horn 131 by a plurality of conductive wires 114 . Figure 5This is the state where the proximal end of the medical stent 110 is first pulled into the introduction sheath 130 .

[0061] like Figure 6 As shown, when the medical stent 110 is completely pulled into the introduction sheath 130, it is loaded in the introduction sheath 130 in a compressed state, and then the medical stent 110 in the introduction sheath 130 is pushed into the microcatheter according to a conventional delivery method. After entering the microcatheter, the medical stent 110 can be pushed toward the distal end of the microcatheter with the help of the conductive wire 114 and the push tube 116 covering the conductive wire 114. Taking aneurysm occlusion as an example, when the medical stent 110 is pushed and released to the neck of the aneurysm, the proximal end 111 of the medical stent 110 and the conductive wire 114 are released by an external release device.

[0062] like Figure 7 As shown, when release is required, the conductive wire 114 is positively charged ("+" indicates positive charge) and the push tube 116 is negatively charged ("-" indicates negative charge). As a result, the electrolytic release point 115 and the distal end of the push tube 116 form a loop in the conductive environment of blood or saline, causing all the electrolytic release points 115 to be continuously corroded.

[0063] like Figure 8 and Fig. 9 As shown, when the electrolytic release point 115 is completely corroded, the connecting device 112 is separated from the conductive wire 114, so that the released medical stent 110 remains alone in the body.

[0064] As mentioned above, the stent delivery device provided by the present invention can provide a new storage method and delivery method for medical stents, so that the medical stents can be stored in a natural state, and then stored in an introduction sheath in a non-compressed state, thereby avoiding the loss of performance of the stent due to aging, and can largely eliminate the influence of temperature and humidity during the aging process on the performance of the compressed state stent. Moreover, in actual operation, the clinician can deliver the stent to the position through a simple push-pull action before the operation, which realizes the convenience of operation without increasing the difficulty of operation. In addition, when the medical stent is stored in a natural state, it is also convenient for the clinician to conduct a comprehensive observation of the medical stent before the operation, and intuitively confirm the integrity and availability of the stent, which can better ensure the safety and effectiveness of the stent during use.

[0065] The above description is only a description of the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any changes or modifications made by a person skilled in the art in the field of the present invention based on the above disclosure shall fall within the scope of protection of the technical solution of the present invention.

Claims

1. A stent delivery device, characterized in that: It comprises a medical stent and an introduction sheath, wherein the medical stent is used for storage in a natural state, a plurality of connection devices are circumferentially arranged on the proximal upper end of the medical stent, each of the connection devices is connected to a conductive wire, an electrolysis release point is formed between each of the connection devices and the corresponding conductive wire, and the medical stent stored in a natural state can be pulled into the introduction sheath by the plurality of the conductive wires to enter the microcatheter.

2. The stent delivery device according to claim 1, characterized in that: The connecting device is a developable structure.

3. The stent delivery device according to claim 2, characterized in that: The medical stent is a braided stent, and the connecting device is arranged at the parallel wire area at the proximal end of the medical stent.

4. The stent delivery device according to claim 1, characterized in that: All the connecting devices are evenly arranged along the circumferential direction on the proximal end of the medical stent.

5. The stent delivery device according to claim 1, characterized in that: The number of the connecting devices is 2 to 16.

6. The stent delivery device according to claim 1, characterized in that: The length of the connecting device is 0.2 mm to 2 mm, and the radial dimension is 0.05 mm to 1.0 mm.

7. The stent delivery device according to claim 1, characterized in that: The length of the electrolysis release point is 0.2 mm to 1.0 mm, and / or the radial dimension of the electrolysis release point is 0.001 in to 0.004 in.

8. The stent delivery device according to claim 1, characterized in that: The radial dimension of the conductive thread is 0.002 in to 0.005 in.

9. The stent delivery device according to claim 1, characterized in that: At least part of the connecting devices are staggered in the axial direction of the medical support.

10. The stent delivery device according to claim 2, characterized in that: The connecting device is one of a developing spring, a developing clamping ring and a developing sleeve.

11. The stent delivery device according to claim 1, characterized in that: It also includes a pushing tube, wherein the distal ends of all the conductive wires are connected to the corresponding connecting devices, the proximal ends of all the conductive wires are inserted into the pushing tube, the proximal ends of all the conductive wires extend to the proximal end of the pushing tube and are connected to the proximal end of the pushing tube, and when the electrolysis release point is released, part of the structure of the pushing tube is negatively charged, and all the conductive wires are positively charged.

12. The stent delivery device according to claim 11, characterized in that: The push tube comprises a first part and a second part which are arranged along its own axial direction and remain insulated. The conductive wire passed through the first part remains insulated from the first part, and the conductive wire passed through the second part is connected to the second part through its proximal end and is electrically conductive. When the electrolytic release point is released, the first part is negatively charged, and all the conductive wires and the second part are positively charged.

13. The stent delivery device according to claim 1 or 11, characterized in that: The proximal ends of all the conductive threads are connected as a whole to form a binding area.

14. The stent delivery device according to claim 13, characterized in that: The distance from the binding area of ​​each conductive thread to the corresponding electrolysis release point is 1.0 mm to 10 mm.

15. The stent delivery device according to claim 1, characterized in that: The distal end of the introduction sheath is provided with a bell mouth, and the medical stent in a natural state is used to be introduced into the introduction sheath through the bell mouth.

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