Self-expanding stent system

Abstract

The application provides a self-expanding stent system, a control end, an inner tube assembly, a split head and an outer tube assembly, the inner tube assembly comprises an inner tube and a middle layer tube sleeved outside the inner tube, the split head is arranged outside the middle layer tube, two sides of the split head are respectively provided with a first stent and a second stent, and the outer tube assembly comprises a first outer tube sleeved outside the first stent and a second outer tube sleeved outside the second stent. The self-expanding stent system provided by the application is characterized in that the first stent and the second stent are located on opposite sides of the split head, the inner tube and the second outer tube are respectively controlled through the control end, two first stents and two second stents of the same or different specifications can be released on the opposite sides of the split head, different specifications of stents can be combined and used according to the number and size of lesions, multiple lesions can be treated, the situation of multiple instruments and multiple implantations is avoided, the operation difficulty is reduced, the operation time is shortened, and the treatment cost is reduced.

Description

TECHNICAL FIELD

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

[0002] Lumen stenosis and occlusion, vascular atherosclerosis, calcification and dissection are common diseases, and if not treated and operated in time, it will cause serious damage to the cardiovascular system, respiratory system, digestive system, urinary system and endocrine system, and even endanger life. And lumen stent surgery is an important, even the main treatment tool and means for treating such diseases.

[0003] The traditional stent system adopts a single long stent compressed in the delivery system, and then delivered to the lesion by the delivery system. The stent system can expand the occluded blood vessels to restore the lumen and blood flow of the blood vessels, and prevent restenosis caused by blood vessel contraction. However, in general, the lesions of lower extremity arteries are long and contain complex and severe physiological loads such as stretching, bending, twisting, compression and pulsation. And due to the long occlusive lesions of lower extremity arteries and the large number of dissections, in the prior art, a long stent or multiple short stents are generally implanted to cover all dissections. However, if a long stent is implanted, the amount of metal implantation will increase, and it is difficult to cope with multiple complex and severe physiological loads, and the long-term efficacy is not good; if multiple short stents are implanted, multiple sets of instruments need to be implanted multiple times, greatly increasing the operation time and cost.

[0004] In Chinese patent application CN108852575A, a multi-section application operation system of a closed self-expanding unit stent is disclosed, which includes an inner sleeve assembly, an outer sleeve assembly and a Y-shaped connector, and further includes a stent assembly part provided on the operation assembly part, the stent assembly part includes multiple unit stents and multiple anti-jumping assemblies for stably releasing the corresponding unit stents, the unit stents and the anti-jumping assemblies are provided on the inner sleeve assembly, and the system can simultaneously have the ability of single loading, delivery and release of multiple stents, and can provide stable safety, visual release and minimally invasive characteristics during use.

[0005] However, in this technical solution, the unit stent only has one release outlet, and all unit stents must be released from one release outlet, so only unit stents of the same specification can be loaded in the system. However, in actual operation, multiple specifications of unit stents often need to be matched, and different unit stents need to be released according to the specific location, so if different specifications of unit stents need to be replaced, multiple implantations are also needed, greatly increasing the operation time and cost. SUMMARY

[0006] The self-expanding stent system aims to solve the technical problem that only one specification of unit stent can be implanted at a time in the prior art, and different specifications of unit stents need to be implanted multiple times.

[0007] To achieve the above-mentioned purpose, the technical scheme adopted by the present application is to provide a self-expanding stent system, comprising: a control end;

[0008] An inner tube assembly comprising an inner tube and a middle layer tube sleeved outside the inner tube, the inner tube being connected with the control end and sliding in the middle layer tube;

[0009] A split head arranged outside the middle layer tube and fixedly connected with the middle layer tube, two sides of the split head being respectively provided with a first stent and a second stent, and the first stent and the second stent being sleeved outside the middle layer tube; and

[0010] An outer tube assembly comprising a first outer tube sleeved outside the first stent and a second outer tube sleeved outside the second stent, one end of the first outer tube being fixedly connected with the inner tube, and the other end being sleeved on the split head; one end of the second outer tube being sleeved on the split head, and the other end being connected with the control end.

[0011] Further, the inner tube has a cavity inside for a guide wire to pass through.

[0012] Further, the distal end of the inner tube is provided with a connecting end, the connecting end is fixedly connected with the inner tube, and the first outer tube is fixedly connected with the connecting end.

[0013] Further, the connecting end has a guide cone surface at the end away from the inner tube.

[0014] Further, the outer side of the middle layer tube is further provided with a first hanging head part and a second hanging head part, the end of the first stent is hung on the first hanging head part, and the end of the second stent is hung on the second hanging head part.

[0015] Further, the first hanging head part and the first stent correspond one by one, and the first hanging head part is located at the distal end of the first stent; the second hanging head part and the second stent correspond one by one, and the second hanging head part is located at the proximal end of the second stent.

[0016] Further, the first stent and the second stent each have a plurality of folded units with a shape memory function, and adjacent folded units are fixedly connected.

[0017] Further, the folded unit comprises four connecting rods, and the four connecting rods are enclosed in a rhombus shape, and the edges and corners of the connecting rods of adjacent folded units are fixedly connected.

[0018] Further, the first stent and the second stent are of the same specification, or the first stent and the second stent are of different specifications.

[0019] Further, the first stent has a length of 2-20 mm and a diameter of 2-7 mm, and the second stent has a stent length of 2-30 mm and a diameter of 5-10 mm.

[0020] Further, the proximal ends of the first stent and the second stent, and / or the distal ends of the first stent and the second stent are provided with radiographic markers.

[0021] Further, the radiographic markers are made of one or more of platinum, gold, tantalum, and tungsten.

[0022] Further, the outer surfaces of the first stent and the second stent are coated with a drug coating.

[0023] Further, the control end is a control handle, which is arranged at the proximal end of the outer tube assembly and connected to the second outer tube and the inner tube.

[0024] The self-expanding stent system provided by the application has the following advantages:

[0025] 1. The first stent and the second stent are located on opposite sides of the split head, and the inner tube and the second outer tube are controlled by the control end respectively, so that the two first stents and the two second stents of the same or different specifications can be released on the opposite sides of the split head, there are two independently controlled release outlets, different specifications of stents can be used according to the number and size of lesions for treatment of multiple lesions, and different specifications of stents can be selected according to the specific condition, avoiding multiple instruments and multiple implantation, reducing the operation difficulty, shortening the operation time, and reducing the treatment cost.

[0026] 2. The first stent and the second stent can be arranged axially and spaced apart along the inner tube assembly, and can be selectively and independently positioned and released, so that precise treatment can be performed according to the number, position, and size of target lesions, the metal implantation rate can be effectively reduced, the flexibility of the blood vessel is maximally retained, the risk of stent wire breakage is reduced, the incidence of restenosis is reduced, and the long-term treatment effect is ensured.

[0027] 3. The first stent and the second stent are shorter than conventional lower limb artery stents, which can effectively reduce the metal implantation rate, reduce the stimulation of metal foreign bodies on the intima, and also avoid the risk of stent wire breakage when the stent bears complex and severe physiological load, thereby ensuring the long-term treatment effect.

[0028] 4. The inner tube has a cavity inside, allowing medical instruments such as guide wires to pass through and enter the interior. This enables precise treatment and allows for multiple different implantation procedures in a single procedure, reducing the number of implantations required. The first and second stents are also equipped with imaging markers to show their positions, facilitating the operation, reducing the difficulty of the surgery, and shortening the operation time. Attached Figure Description

[0029] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0030] Figure 1 This is a schematic diagram of the structure of the self-expanding support system provided in an embodiment of the present invention;

[0031] Figure 2 This is a schematic diagram of the distal end of the self-expanding stent system provided in an embodiment of the present invention;

[0032] Figure 3 This is a schematic diagram of the structure of the first or second support used in the embodiments of the present invention;

[0033] Figure 4 This is a schematic diagram of the control handle used in an embodiment of the present invention.

[0034] Explanation of reference numerals in the attached figures:

[0035] 1. Control handle; 2. Inner tube assembly; 3. Divider head; 4. Outer tube assembly; 5. First bracket; 6. Second bracket; 7. First hanging head component; 8. Second hanging head component; 11. Housing; 12. First drive component; 13. Second drive component; 14. Protective tube; 15. Fixing seat; 121. First drive component; 122. First rack; 123. First gear; 131. Second drive component; 132. Second rack; 133. Second gear; 21. Inner tube; 22. Middle tube; 23. Connecting end; 231. Guide cone surface; 31. Step surface; 41. First outer tube; 42. Second outer tube. Detailed Implementation

[0036] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0037] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third" are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0038] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting" should be broadly understood, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0039] In the present application, "proximal" and "distal" are the relative orientation, relative position and relative direction of elements or actions with respect to each other from the perspective of a doctor using the medical device, although "proximal" and "distal" are not restrictive, but "proximal" generally refers to the end of the medical device close to the doctor during normal operation, and "distal" generally refers to the end first entering the patient's body.

[0040] In addition, the technical features involved in the different embodiments of the application described below can be combined with each other as long as there is no conflict between them.

[0041] Please refer to Figure 1 and Figure 2 , the self-expanding stent system provided by the present application will be described. The self-expanding stent system comprises a control end, an inner tube assembly 2 and an outer tube assembly 4, the outer tube assembly 4 is sleeved on the outer side of the inner tube assembly 2, and the inner tube assembly 2 and the outer tube assembly 4 can be placed inside the human body, the control end is located outside the human body, and the inside can be controlled through the control end.

[0042] Further, please refer to Figures 1 to 4 , as a specific embodiment of the self-expanding stent system provided by the present application, the control end adopts a control handle 1, the control handle 1 is arranged at the proximal end of the outer tube assembly 4, and the control handle 1 is connected with the second outer tube 42 and the inner tube 21 respectively.

[0043] The control handle 1 comprises a shell 11, a first driving member 12 for driving the first outer tube 41 to move relative to the first support 5, and a second driving member 13 for driving the second outer tube 42 to move relative to the second support 6, the first driving member 12 and the second driving member 13 are arranged inside the shell 11, and the first driving member 12 comprises a first driving piece 121, and the second driving member 13 comprises a second driving piece 131.

[0044] The shell 11 generally refers to the shell of the handle 11, which is hollow inside and has a plurality of arc surfaces on the appearance, so as to be convenient for the operator to hold with the hand. The first driving member 12 is indirectly connected with the first outer tube 41, and is used for driving the first outer tube 41 to move towards the distal end. The second driving member 13 is directly connected with the second outer tube 42, and is used for driving the second outer tube 42 to move towards the proximal end, so that the first support 5 and the second support 6 can respectively bulge out from the two sides of the split head 3.

[0045] Further, the first driving member 12 further comprises a first rack 122 and a first gear 123, the first gear 123 is fixedly connected with the first driving piece 121, and the first rack 122 is engaged with the first gear 123, and the first rack 122 is connected with the first outer tube 41 through the inner tube 21 and the connecting end 23. The rotation of the first driving piece 121 drives the rotation of the first gear 123, and the rotation energy and the linear motion energy are converted through the engagement of the first gear 123 and the first rack 122. According to actual conditions and specific requirements, in other embodiments of the present application, a turbine and worm structure or a screw structure can also be used to realize the conversion of rotation energy and linear motion energy, which is not limited here.

[0046] Preferably, the first driving piece 121 adopts a dial, and the outer edge of the dial has a plurality of convex parts for increasing friction. The operator holds the handle with one finger to dial the dial, which can realize the rotation of the dial, so as to realize the movement of the first outer tube 41 towards the distal end. The first driving piece 121 can also directly adopt a motor or a rotary driving member such as a hand wheel, which is not limited here.

[0047] Further, the second driving member 13 further comprises a second rack 132 and a second gear 133, the second gear 133 is fixedly connected with the second driving piece 131, the second rack 132 is engaged with the second gear 133, and the second rack 132 is connected with the second outer tube 42. The rotation of the second driving piece 131 drives the rotation of the second gear 133, and the rotation energy and the linear motion energy are converted through the engagement of the second gear 133 and the second rack 132. According to actual conditions and specific needs, in other embodiments of the application, a turbine and worm structure or a screw structure can also be used to realize the conversion of rotation energy and linear motion energy, which is not limited here.

[0048] Preferably, the second driving piece 131 adopts a dial, the outer edge of the dial has a plurality of convex parts that increase the friction force, and the operator holds the handle with one finger dialing the dial, which can realize the rotation of the dial, thereby realizing the movement of the first outer tube 41 towards the distal end. The second driving piece 131 can also directly adopt a motor or a rotary driving piece such as a hand wheel, which is not limited here.

[0049] Preferably, the first driving piece 121 and the second driving piece 131 both adopt dials, and the two dials are arranged side by side on one side of the shell 11, so that single-handed operation can be realized, and control is more convenient.

[0050] Preferably, the end of the shell 11 is provided with a protective tube 14, the second outer tube 42 is arranged in the protective tube 14 and is in sliding connection with the protective tube 14, the second outer tube 42 is connected to the second rack 132, the inner tube 21 is also arranged in the second outer tube 42, and the inner tube 21 is connected to the first rack 122 through the protective tube 14.

[0051] Preferably, the first driving piece 121 is located at the proximal end of the second driving piece 131, that is, the first driving member 12 is located on the side of the shell 11 close to the protective tube 14, and the second driving member 13 is located on the side of the shell 11 away from the protective tube 14. At this time, the inner tube 21 and the middle layer tube 22 can pass through one side of the first driving member 12, a fixed seat 15 is arranged on the outer side of the middle layer tube 22, the fixed seat 15 can be buckled on the outer side of the middle layer tube 22 and fixedly connected with the inner side wall of the shell 11, so that the position of the middle layer tube 22 is fixed relative to the position of the driving handle, and the inner tube 21 can slide in the middle layer tube 22 under the driving of the second driving member 13.

[0052] Further, please refer to Figure 2As a specific embodiment of the self-expanding stent system provided by the application, the inner tube assembly 2 comprises an inner tube 21 and a middle layer tube 22 sleeved outside the inner tube 21, the inner tube 21 is connected with the control handle 1 and slides in the middle layer tube 22, the inner tube 21 can move forward and backward under the control of the control handle 1, and the movement of the second outer tube 42 is driven by the inner tube 21.

[0053] The distal end of the inner tube 21 is provided with a connecting end 23 fixedly connected with the inner tube 21, and the inner tube 21 has a cavity (not marked in the figure) for the guide wire to pass through, and the connecting end 23 also has a through hole (not marked in the figure) for the guide wire to pass through, so that the medical device such as the guide wire can pass through the inner tube 21 to enter the human body, which can realize point treatment, a plurality of different implantation operations can be realized at a time, the number of implantation is reduced, the operation is facilitated, the difficulty of surgical operation is reduced, and the operation time is shortened.

[0054] The connecting end 23 is located at the farthest end of the entire self-expanding stent system, and the distal end of the connecting end 23 has a guide conical surface 231, that is, the outer edge of the connecting section has an inclined guide surface, which can be more conveniently inserted into the human body.

[0055] The connecting end 23 can also be fixedly connected with the distal end of the first outer tube 41, the connection between the first outer tube 41 and the inner tube 21 is realized through the connecting end 23, the first outer tube 41 and the inner tube 21 can realize linkage, the movement of the inner tube 21 can be controlled through the control handle 1, and then the movement of the first outer tube 41 is driven, so that the first stent 5 is released.

[0056] Further, referring to Figure 2 As a specific embodiment of the self-expanding stent system provided by the application, the split head 3 is sleeved outside the middle layer tube 22, and the split head 3 is fixedly connected with the middle layer tube 22, the middle layer tube 22 is divided into two independent release areas by the split head 3, the two sides of the split head 3 are respectively provided with the first stent 5 and the second stent 6 of the same specification or different specifications, and the first stent 5 and the second stent 6 are sleeved outside the middle layer tube 22.

[0057] The two sides of the split head 3 are also provided with the first hanging head part 7 and the second hanging head part 8, the first hanging head part 7 and the second hanging head part 8 are directly fixedly sleeved outside the middle layer tube 22, the end of the first stent 5 is hung on the first hanging head part 7, the first hanging head part 7 and the first stent 5 correspond one by one, and the first hanging head part 7 is located at the distal end of the first stent 5, so that the first stent 5 can be released when the first outer tube 41 moves toward the distal end.

[0058] The end of the second support 6 is hung on the second hanging head part 8, the second hanging head part 8 corresponds to the second support 6 one by one, and the second hanging head part 8 is located at the proximal end of the second support 6, so that the second support 6 can be released when the second outer tube 42 moves towards the proximal end.

[0059] The first hanging head part 7 is generally provided with a protruding part, and the end of the first support 5 is formed with a circular hole which can be buckled on the outside of the protruding part. The protruding part and the circular hole are fixed by cooperation, and the protruding part and the circular hole can be separated when the first support 5 expands, that is, the first support 5 can be left in the corresponding position. The second hanging head part 8 is also provided with a protruding part, and the end of the second support 6 is formed with a circular hole which can be buckled on the outside of the protruding part. The protruding part and the circular hole are fixed by cooperation, and the protruding part and the circular hole can be separated when the second support 6 expands, that is, the second support 6 can be left in the corresponding position. According to actual conditions and specific needs, in other embodiments of the present application, the first support 5 and the first hanging head part and the second support 6 and the second hanging head part can also be fixed and connected in other buckling modes, which are not limited here.

[0060] Preferably, referring to Figure 3 The first support 5 and the second support 6 each have a plurality of folding units (not marked in the figure) with shape memory function. Each folding unit can be compressed when the first support 5 or the second support 6 is compressed into the outer tube assembly 4, and then expanded under the action of elastic restoring force after extending out of the outer tube assembly 4. The number of folding units is multiple, and the multiple folding units are fixedly connected in sequence to form a ring shape. The ring-shaped folding units are enclosed on the outside of the inner tube assembly 2.

[0061] The folding units can be divided into at least two columns, thereby widening the width of the entire first support 5 or second support 6. The folding units between adjacent two columns can be partially fixedly connected or not directly connected.

[0062] Preferably, the folding unit includes four connecting rods (not marked in the figure), and the four connecting rods are enclosed in a diamond shape. The diamond shape can facilitate compression and expansion, and can form a filling hollow structure with a large aperture to save metal materials. The corners of the connecting rods of adjacent folding units are fixedly connected, which can ensure the stability of the connection between adjacent folding units, and can expand the inner diameter of the entire first support 5 or second support 6 by expansion, and abut against the inner wall of the blood vessel. Of course, according to actual conditions and specific needs, in other embodiments of the present application, the folding unit can also be four or more connecting rods spliced into a parallelogram or a hexagon, which is not limited here.

[0063] Further, please refer to Figure 2 As a specific embodiment of the self-expanding stent system provided by the present application, the outer tube assembly 4 is sleeved on the outside of the inner tube assembly 2 to protect the inner tube assembly 2. The outer tube assembly 4 includes a first outer tube 41 sleeved on the outside of the first stent 5 and a second outer tube 42 sleeved on the outside of the second stent 6, which can prevent the self-expanding of the first stent 5 and the second stent 6. One end of the first outer tube 41 is fixedly connected with the inner tube 21, and the other end is sleeved on the segmentation head 3. The first outer tube 41 can be moved toward the distal end under the driving of the inner tube 21, so that the first outer tube 41 and the segmentation head 3 are separated, and the first stent 5 can be expanded from between the first outer tube 41 and the segmentation head 3.

[0064] Preferably, the connecting end 23 is fixedly connected with the inner tube 21 and the first outer tube 41, that is, when the control handle 1 controls the movement of the inner tube 21, the inner tube 21 drives the movement of the connecting end 23, and then the first outer tube 41 can be driven to move by the connecting end 23, so that the separation of the first outer tube 41 and the segmentation head 3 can be realized. Alternatively, the connecting end 23 can not be provided, and the distal end of the inner tube 21 and the first outer tube 41 can be fixedly connected, which is not limited herein.

[0065] Further, one end of the second outer tube 42 is sleeved on the segmentation head 3, and the other end is connected with the control handle 1. The second outer tube 42 can be directly moved toward the proximal end under the driving of the control handle 1, so that the second outer tube 42 and the segmentation head 3 are separated, and the second stent 6 can be expanded from between the second outer tube 42 and the segmentation head 3.

[0066] Preferably, the proximal end and the distal end of the segmentation head 3 are both provided with a stepped surface 31, which can be inserted and sleeved by the first outer tube 41 and the second outer tube 42, so as to ensure the stable connection between the segmentation head 3 and the first outer tube 41 and the second outer tube 42, and avoid the accidental falling of the first stent 5 or the second stent 6.

[0067] Preferably, the specifications of the first stent 5 and the second stent 6 can be the same, so that the self-expanding stents can be placed on both sides at the same time, thereby saving the operation time. Alternatively, the specifications of the first stent 5 and the second stent 6 can be different, and different specifications of stents can be combined according to the number and size of lesions to treat multiple lesions, thereby avoiding the use of multiple instruments and multiple implantations, reducing the operation difficulty, shortening the operation time, and reducing the treatment cost.

[0068] The length of the first stent 5 is 2-20 mm and the diameter is 2-7 mm; the length of the second stent 6 is 2-30 mm and the diameter is 5-10 mm. The specifications of the first stent 5 and the second stent 6 are two commonly used specifications in surgical operations, which can be applied to most environments. The diameter of the second stent 6 is generally larger than that of the outer tube assembly 4, so that the outer tube assembly 4 can easily pass through the second stent 6, avoiding affecting the setting position of the second stent 6.

[0069] Preferably, the proximal end of the first stent 5 and the second stent 6, and / or the distal end of the first stent 5 and the second stent 6 is provided with a developing mark (not shown in the figure). The developing mark can better position the first stent 5 and the second stent 6, making it easier to observe the specific position of the first stent 5 and the second stent 6 from the outside, and improving the accuracy of positioning the first stent 5 and the second stent 6. The developing mark can be provided at both ends of the first stent 5 and the second stent 6, clearly positioning the length and position of the first stent 5 and the second stent 6, and allowing precise treatment according to the actual needs of clinical treatment. The operation is simple and avoids excessive stent treatment.

[0070] The developing mark is made of one or more of platinum, gold, tantalum, and tungsten, which can be clearly detected by a detection mechanism and has a higher developing accuracy.

[0071] Preferably, one or more developing marks can also be provided at the middle part of the first stent 5 and the second stent 6, thereby marking the bending of the first stent 5 and the second stent 6, which is not limited here.

[0072] Preferably, the outer surface of the first stent 5 and the second stent 6 is coated with a drug coating (not shown in the figure), which includes active drugs selected from one or more of anti-intimal hyperplasia drugs, anticoagulant drugs, anti-platelet adhesion drugs, anti-infective drugs, antibacterial drugs, anti-inflammatory drugs, and anti-allergic drugs. That is, the active drugs are one or more of paclitaxel, docetaxel, rapamycin and its derivatives, statins, aspirin, warfarin, heparin, low molecular weight heparin, and cilostazol.

[0073] The drug coating on the outer surface of the first stent 5 and the second stent 6 can contact and adapt to the surrounding tissue after the first stent 5 and the second stent 6 are self-expanded, and the drug coating can be directly contacted with the surrounding tissue for targeted drug delivery under the driving of the self-expansion of the first stent 5 and the second stent 6, so that the local drug concentration is increased, thereby inhibiting the production of neointima in the blood vessel and reducing the probability of restenosis.

[0074] As an alternative embodiment of the present embodiment, the control end can also be an electric control end, that is, the inner tube assembly 2 and the outer tube assembly 4 are directly connected to an electric control end, which includes a cabinet and a control assembly arranged inside the cabinet. The control assembly is driven by a motor or other driving element to drive the first outer tube 41 and the second outer tube 42. The cabinet is externally provided with a control panel, and the movement position of the first outer tube 41 and the second outer tube 42 can be controlled by controlling the control panel, which can more conveniently and accurately achieve control. Here, no limitation is made.

[0075] As an alternative embodiment of the present embodiment, the folding units of the first support 5 and the second support 6 can also be made of inflatable balloons or other non-shape memory alloy folding units, which can be pre-compressed elastic members or elements similar to torsional springs. Here, no limitation is made.

[0076] As an alternative embodiment of the present embodiment, the first support 5 and the second support 6 can be formed by splicing and combining a plurality of folding units, and the length thereof can be adjusted as needed, including but not limited to greater than 20 mm or 30 mm.

[0077] As an alternative embodiment of the present embodiment, the specific release mode of the first support 5 and the second support 6 can also be adjusted according to the composition of the inner tube assembly 2 and the outer tube assembly 4. Here, no limitation is made.

[0078] As an alternative embodiment of the present embodiment, the two ends of the first support 5 and the second support 6 can also not be provided with a developing mark, and the first support 5 and the second support 6 can be directly made of developing material. The outer side of the first support 5 and the second support 6 can also not be provided with a drug layer. Here, no limitation is made.

[0079] Obviously, the above embodiments are only examples for clear illustration, and not a limitation on the embodiments. For those skilled in the art, other different forms of changes or variations can be made on the basis of the above description. Here, it is not necessary and impossible to exhaust all the embodiments. The obvious changes or variations derived therefrom are still within the protection scope of the present invention.

Claims

1. A self-expanding stent system, characterized in that, include: Control terminal; The inner tube assembly (2) includes an inner tube (21) and a middle tube (22) sleeved on the outside of the inner tube (21). The inner tube (21) is connected to the control end and slides inside the middle tube (22). A dividing head (3) is provided outside the middle layer tube (22), and the dividing head (3) is fixedly connected to the middle layer tube (22). The middle layer tube (22) is divided into two independent release areas by the dividing head. A first bracket (5) and a second bracket (6) are provided on both sides of the dividing head (3), and the first bracket (5) and the second bracket (6) are sleeved on the outside of the middle layer tube (22). as well as The outer tube assembly (4) includes a first outer tube (41) sleeved on the outside of the first support (5) and a second outer tube (42) sleeved on the outside of the second support (6). One end of the first outer tube (41) is fixedly connected to the inner tube (21), and the other end is sleeved on the dividing head (3). One end of the second outer tube (42) is sleeved on the dividing head (3), and the other end is connected to the control terminal. The first bracket (5) and the second bracket (6) are axially spaced along the inner tube assembly (2), and the first bracket (5) and the second bracket (6) can be selectively and independently positioned at the split head (3) for release.

2. The self-expanding stent system as described in claim 1, characterized in that: The inner tube (21) has a cavity inside for the guide wire to pass through.

3. The self-expanding stent system as described in claim 1, characterized in that: The inner tube (21) has a connecting end (23) at its far end, and the connecting end (23) is fixedly connected to the inner tube (21), and the first outer tube (41) is fixedly connected to the connecting end (23).

4. The self-expanding stent system as described in claim 3, characterized in that: The connecting end (23) has a guide cone (231) at the end away from the inner tube (21).

5. The self-expanding stent system according to any one of claims 1 to 4, characterized in that: The outer side of the middle tube (22) is provided with a first hanging head (7) and a second hanging head (8), the end of the first bracket (5) is hung on the first hanging head (7), and the end of the second bracket (6) is hung on the second hanging head (8).

6. The self-expanding stent system as described in claim 5, characterized in that: The first hanging head (7) and the first bracket (5) are in one-to-one correspondence, and the first hanging head (7) is located at the far end of the first bracket (5); the second hanging head (8) and the second bracket (6) are in one-to-one correspondence, and the second hanging head (8) is located at the near end of the second bracket (6).

7. The self-expanding stent system according to any one of claims 1 to 4, characterized in that: Both the first support (5) and the second support (6) have a plurality of folding units with shape memory function, and adjacent folding units are fixedly connected.

8. The self-expanding stent system as described in claim 7, characterized in that: The folding unit includes four connecting rods, which form a rhombus shape, and the corners of the connecting rods of adjacent folding units are fixedly connected.

9. The self-expanding stent system according to any one of claims 1 to 4, characterized in that: The first bracket (5) and the second bracket (6) have the same specifications, or the first bracket (5) and the second bracket (6) have different specifications.

10. The self-expanding stent system as described in claim 9, characterized in that: The first bracket (5) has a length of 2 to 20 mm and a diameter of 2 to 7 mm; the second bracket (6) has a bracket length of 2 to 30 mm and a diameter of 5 to 10 mm.

11. The self-expanding stent system according to any one of claims 1 to 4, characterized in that: The proximal ends of the first stent (5) and the second stent (6), and / or the distal ends of the first stent (5) and the second stent (6) are provided with imaging marks.

12. The self-expanding stent system as described in claim 11, characterized in that: The developing marker material is one or more of platinum, gold, tantalum, and tungsten.

13. The self-expanding stent system according to any one of claims 1 to 4, characterized in that: Both the outer surfaces of the first stent (5) and the second stent (6) are coated with a drug coating.

14. The self-expanding stent system according to any one of claims 1 to 4, characterized in that: The control end adopts a control handle (1), which is located near the end of the outer tube assembly (4) and is connected to the second outer tube (42) and the inner tube (21) respectively.

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