A branched stent

Abstract

The application belongs to the technical field of medical devices, and particularly relates to a branch stent, which comprises a stent body and a skirt structure arranged on the stent body, the stent body comprises a main stent and a main covering film arranged on the main stent, the skirt structure comprises a sealing stent segment connected to the stent body and a fixing stent segment connected to the sealing stent segment, and a developing structure is arranged on the skirt structure. According to the branch stent in the application, the sealing stent segment is used to seal the branch opening of the blood vessel stent to prevent internal leakage; secondly, the fixing stent segment can be folded, and the fixing stent segment is automatically folded after being released from the delivery sheath, so that the branch stent is prevented from moving; in addition, the developing structure is arranged on the skirt structure to show the state of the skirt structure after being released from the delivery sheath, so that the operator can observe conveniently.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of medical devices, and particularly relates to a branch stent. BACKGROUND

[0002] Aortic aneurysm and aortic dissection are diseases that seriously endanger human life safety at present. If not actively treated, the aortic aneurysm and dissection will continue to enlarge, and finally rupture, causing serious complications and death. With the continuous increase of patients with hypertension, hyperlipidemia and diabetes, the incidence of aortic aneurysm and aortic dissection is also significantly increasing.

[0003] Traditional open surgery for aortic aneurysm and aortic dissection has the characteristics of large trauma, high mortality, long operation time, high incidence of postoperative complications and high surgical difficulty, while endovascular treatment has the characteristics of small trauma, fewer postoperative complications, short operation time and low surgical difficulty, and gradually becomes the main way for treating aortic aneurysm and aortic dissection at present. By implanting a covered stent in the aorta, the vascular lesions are isolated outside the covered stent, and the blood flow is constrained to flow from the inside of the covered stent, thereby achieving the purpose of protecting the blood vessels.

[0004] In the application of the covered stent, the main stent is often used in combination with the branch stent, and endoleak is one of the problems that often occurs during the combination. The skirt stent is a branch stent specially applied to the reconstruction of branch channels. The skirt thereof has a good anti-endoleak effect when used in combination with the main stent, and the deployment state of the skirt in the operation directly determines the anti-endoleak effect of the branch stent.

[0005] Therefore, a new technical means is needed to solve the problem that the deployment state of the skirt of the branch stent after implantation is difficult to observe. SUMMARY

[0006] The purpose of the present application is to at least solve the problem that the state of the skirt of the branch stent with a skirt after implantation is difficult to observe.

[0007] An aspect of the present application provides a branch stent, which comprises a stent body and a skirt structure arranged on the stent body, the stent body comprises a main stent and a main cover arranged on the main stent; the skirt structure comprises a sealing stent segment connected to the stent body and a fixed stent segment connected to the sealing stent segment, and a developing structure is arranged on the skirt structure.

[0008] According to the branch stent in the application, the branch stent can be placed at a branch opening of a blood vessel stent to establish a passage of a branch blood vessel, and the branch opening of the blood vessel stent is sealed by a sealing stent segment to prevent endoleak; secondly, a fixing stent segment can be folded, and the fixing stent segment is automatically folded after being released from a delivery sheath to prevent the branch stent from moving; in addition, a development structure is arranged on a skirt structure to show a state of the skirt structure after being released from the delivery sheath, thereby facilitating an operator to observe.

[0009] In some embodiments of the application, the fixing stent segment comprises a fixing segment stent and a fixing segment covering film arranged on the fixing segment stent, and the development structure comprises a fixing development part arranged on the fixing segment stent and / or an end development part arranged on the fixing segment covering film.

[0010] In some embodiments of the application, the fixing development part comprises a plurality of fixing development points arranged on the fixing segment stent in a circumferential direction.

[0011] In some embodiments of the application, the fixing development points are welded or sutured on the fixing stent segment, or the fixing development points are development wires spirally wound on the fixing stent segment.

[0012] In some embodiments of the application, the end development part comprises a plurality of end development points arranged on the fixing segment covering film in a circumferential direction, and the end development points are arranged at end edges of the fixing segment covering film; or the end development part comprises a development ring arranged at the end edges of the fixing segment covering film.

[0013] In some embodiments of the application, the sealing stent segment is arranged in a tapered shape, the sealing stent segment comprises a sealing segment stent and a sealing segment covering film arranged on the sealing segment stent, and the development structure further comprises a plurality of sealing development points arranged on the sealing segment stent, and the sealing development points are arranged on the sealing segment stent in a circumferential direction.

[0014] In some embodiments of the application, the sealing segment stent is hook-connected with the fixing segment stent, and the sealing segment covering film is integrally formed with the fixing end covering film.

[0015] In some embodiments of the application, the sealing segment stent is hook-connected with the main body stent, and the sealing segment covering film is fixedly connected with the main body covering film after being heat fused.

[0016] In some embodiments of the application, wire diameters of the sealing segment stent and the fixing segment stent are smaller than a wire diameter of the main body stent.

[0017] In some embodiments of the present application, the main body stent comprises a covered stent section provided with the covering film of the main body stent and a bare stent section located at the end of the main body stent and provided bare, the bare stent section being provided with the reinforcing wire, and the reinforcing wire is wound on the bare stent section. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 Fig. 1 is a schematic diagram of the overall structure of the bifurcated stent implanted into the bifurcated blood vessels in Embodiment One of the present application;

[0019] Figure 2 Fig. 2 is a schematic diagram of the overall structure of the bifurcated stent in Embodiment One of the present application;

[0020] Figure 3 Fig. 3 is a schematic diagram of the overall structure of another embodiment of the bifurcated stent in Embodiment One of the present application;

[0021] Figure 4 Fig. 4 is a schematic diagram of the structure of the fixed stent section in the unfolded state in Embodiment One of the present application;

[0022] Figure 5 Fig. 5 is a schematic diagram of the structure of the fixed stent section in the partially folded state in Embodiment One of the present application;

[0023] Figure 6 Fig. 6 is a schematic diagram of the structure of the fixed stent section in the completely folded state in Embodiment One of the present application;

[0024] Figure 7 Fig. 7 is a schematic diagram of the structure of the fixed stent section in the over-folded state in Embodiment One of the present application;

[0025] Figure 8 Fig. 8 is a top view of the fixed stent section in the completely folded state in Embodiment One of the present application;

[0026] Figure 9 Fig. 9 is a schematic diagram of the structure of the fixed development point in Embodiment One of the present application;

[0027] Figure 10 Fig. 10 is a schematic diagram of the structure of the development wire in Embodiment One of the present application;

[0028] Figure 11 Fig. 11 is a schematic diagram of another embodiment of the fixed development point in Embodiment One of the present application;

[0029] Figure 12 Fig. 12 is a schematic diagram of the bare stent section of the bifurcated stent in Embodiment One of the present application;

[0030] Figure 13 Fig. 13 is a schematic diagram of the structure of the reinforcing wire in Embodiment One of the present application;

[0031] Figure 14Figure 2 is a structural schematic diagram of the fixed support section in the unfolded state in the second embodiment of the present application;

[0032] Figure 15 Figure 3 is a structural schematic diagram of the fixed support section in the partially folded state in the second embodiment of the present application;

[0033] Figure 16 Figure 4 is a structural schematic diagram of the fixed support section in the completely folded state in the second embodiment of the present application;

[0034] Figure 17 Figure 5 is a structural schematic diagram of the fixed support section in the over-folded state in the second embodiment of the present application;

[0035] Figure 18 Figure 6 is a top view of the fixed support section in the completely folded state in the second embodiment of the present application;

[0036] Figure 19 Figure 7 is a cross-sectional structural schematic diagram of the blood vessel support placed in the aorta in the third embodiment of the present application;

[0037] Figure 20 Figure 8 is a structural schematic diagram of the fixed developing section in the third embodiment of the present application;

[0038] Figure 21 Figure 9 is a structural schematic diagram of the end developing section in the third embodiment of the present application;

[0039] Figure 22 Figure 10 is a structural schematic diagram of the developing ring in the third embodiment of the present application;

[0040] Figure 23 Figure 11 is a structural schematic diagram of the fixed developing section in the fourth embodiment of the present application;

[0041] Figure 24 Figure 12 is a structural schematic diagram of the end developing section in the fourth embodiment of the present application.

[0042] The various reference numerals in the drawings represent the following:

[0043] 100, branch stent; 200, stent body; 210, main body stent; 211, main body coil; 220, main body covering; 230, covering stent segment; 240, bare stent segment; 250, reinforcing wire; 260, skirt structure; 270, visualization structure; 300, fixed stent segment; 310, fixed segment stent; 320, fixed segment covering; 330, fixed visualization portion; 331, fixed visualization point; 332, visualization wire; 340, fixed coil; 340, end visualization portion; 341, end visualization point; 342, visualization ring; 400, sealing stent segment; 410, sealing segment stent; 420, sealing segment covering; 430, sealing visualization point; 440, sealing coil; 500, aorta; 600, branch vessel; 700, vascular stent; 710, main lumen; 720, branch opening; 730, branch lumen. DETAILED DESCRIPTION

[0044] Example embodiments of the present application will be described herein below with reference to the accompanying drawings. While example embodiments of the present application are illustrated, it is to be understood that the present application is not limited to the illustrated embodiments. Rather, the present application is to be accorded a full scope as defined by the appended claims, and equivalents thereof.

[0045] It is to be understood that the terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

[0046] Although the terms first, second, third, etc. can be used herein to describe various elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms can be only used to differentiate one element, component, region, layer or section from another region, layer or section. Unless the context clearly indicates otherwise, terms such as "first", "second" and other numerical terms when used herein do not imply a sequence or order unless the context clearly indicates otherwise.

[0047] For ease of description, spatial relative terms may be used in the text to describe the relationship of one element or feature relative to another element or feature, as shown in the figure. These relative terms include, for example, "inside," "outside," "middle," "outer," "below," "below," "above," "over," etc. Such spatial relative terms are intended to include different orientations of the device in use or operation, other than those depicted in the figure. For example, if the device in the figure is flipped, then an element described as "below other elements or features" or "below other elements or features" will subsequently be oriented as "above other elements or features" or "above other elements or features."

[0048] For ease of description, the following description uses the terms "distal" and "proximal," where "distal" refers to the end furthest from the heart and "proximal" refers to the end closest to the heart. The phrase "axial direction" should be understood in this patent as indicating the direction in which the interventional device is advanced and de-escalated. The direction perpendicular to the "axial direction" is defined as the "radial direction."

[0049] Example 1

[0050] Embodiment 1 of this application provides a branch support, such as Figures 1 to 3 As shown, the branch support 100 includes a support body 200 and a skirt structure 260 disposed on the support body 200. The support body 200 includes a main support 210 and a main coating 220 disposed on the main support 210. The skirt structure 260 includes a sealing support section 400 connected to the support body and a fixing support section 300 connected to the sealing support section 400. A developing structure 270 is disposed on the skirt structure 260. The sealing support section 400 is tapered.

[0051] Currently, branch supports with skirt structures are mainly used in two scenarios. One is the folding branch support for fenestration techniques, where the foldable skirt structure achieves sealing and anchoring. The other is the application of branch supports for chimney techniques. The branch support in this embodiment is a folding branch support for fenestration techniques.

[0052] The unfolding state of the skirt structure directly determines the leak-proof effect of the branch stent 100. If the skirt structure 260 of the branch stent 100 does not unfold well during implantation, poor sealing or even displacement of the branch stent 100 may occur. This embodiment uses a visualization structure 270 on the skirt structure 260 to visualize the skirt structure 260 during implantation, thus assisting the surgeon. The surgeon can observe the state of the skirt structure 260 and perform targeted procedures, reducing the difficulty and duration of the surgery.

[0053] In addition, the skirt structure 260 is provided with the developing structure 270, so that the doctor can intuitively observe whether the skirt structure 260 is placed in place, and ensure that the skirt structure 260 has good sealing and anchoring after the branch stent 100 is implanted, so as to ensure the smooth progress of the operation and improve the reliability of the operation.

[0054] As shown in Figure 1 The blood vessel stent 700 placed in the aorta 500 includes a main cavity 710 and a branch opening 720 provided on the side of the main cavity 710. The branch stent 100 in this embodiment can be placed at the branch opening 720 of the blood vessel stent 700 to establish a passage to the branch blood vessel 600. First, the branch opening 720 of the blood vessel stent 700 is sealed by the sealing stent segment 400 to prevent internal leakage. Second, the fixed stent segment 300 can be folded, and the fixed stent segment 300 automatically folds after being released from the delivery sheath to prevent the branch stent 100 from moving.

[0055] In addition, the skirt structure 260 is provided with the developing structure 270, which displays the state of the skirt structure 260 after being released from the delivery sheath, so that the operator can conveniently observe, thereby assisting the operator to implant the branch stent 100.

[0056] In the fenestration operation, first, the blood vessel stent 700 for implanting in the aorta 500 is placed at the diseased aorta 500, then the blood vessel stent 700 at the branch blood vessel 600 is perforated to form the branch opening 720, and then the branch stent 100 is placed at the branch opening 720 to establish a passage to the branch blood vessel 600.

[0057] In this embodiment, the branch stent 100 has a foldable skirt structure 260, and the skirt structure 260 is divided into two segments. The first segment is a sealing stent segment 400 arranged in a tapered shape, which can seal openings of different shapes through the taper shape to effectively prevent internal leakage. The second segment is a foldable fixed stent segment 300, which will automatically fold backward after the skirt structure 260 is released from the delivery sheath to prevent the branch stent 100 from moving into the branch blood vessel 600. When the branch stent 100 is released, the skirt structure 260 is first released, then the branch stent 100 is withdrawn as a whole, the skirt structure 260 is attached to the inner wall of the blood vessel stent 700, and then the branch stent 100 is completely released.

[0058] The fixed stent segment 300 includes a fixed segment stent 310 and a fixed segment covering 320 provided on the fixed segment stent 310, and the developing structure 270 includes a fixed developing part 330 provided on the fixed segment stent 310.

[0059] Among them, in combination Figure 3 and4 As shown, the fixed developing section 330 includes a plurality of fixed developing points 331 circumferentially spaced on the fixed support section 310. In this embodiment, the plurality of fixed developing points 331 are circumferentially evenly arranged on the fixed support section 310.

[0060] In this embodiment, the fixed support section 300 is provided with 3 to 6 fixed development points 331. If the number of fixed development points 331 is too small, the entire circumferential state of the skirt structure 260 cannot be fully displayed. Although more fixed development points 331 result in a more complete circumferential display of the skirt structure 260, it also increases the volume of the branch support 100, making the assembly of the branch support 100 more difficult. Therefore, the preferred number of fixed development points 331 is 4.

[0061] The fixed support section 300 is approximately cylindrical in shape, and the fixed developing points 331 are evenly arranged on the circumference of the skirt.

[0062] Specifically, such as Figure 4 As shown, the fixed developing point 331 is designed in an "I" shape, and four "I"-shaped fixed developing points 331 are symmetrically arranged circumferentially on the fixed support section 300. The released sealing support section 400 is tapered, and the fixed support section 300 is approximately cylindrical. The smaller diameter end of the sealing support section 400 is connected to the support body 200, and the larger diameter end of the sealing support section 400 is connected to the fixed support section 300. The larger diameter end of the sealing support section 400 is used to seal the branch opening 720.

[0063] When the fixed bracket section 300 is not folded, such as Figure 4 As shown, when viewed from the side, the fixed developing point 331 on the fixed support section 300 is shown to be of full length, and the fixed developing points 331 at both ends are shown to be basically parallel to the support body 200.

[0064] When the fixed bracket section 300 is folded, as Figure 5 As shown, when viewed from the side, the fixed developing point 331 on the fixed support section 300 is shortened in length, and the fixed developing points 331 at both ends are tilted downwards.

[0065] When the fixed support section 300 is completely folded, as Figure 6 and Figure 8 As shown, when viewed from the side, the fixed developing points 331 on the fixed support section 300 are displayed as dots, while the fixed developing points 331 at both ends are displayed as being basically perpendicular to the support body 200.

[0066] When the fixed bracket section 300 is excessively folded, such asFigure 7 As shown, when viewed from the side, the fixed developing point 331 on the fixed support section 300 is shortened in length, and the fixed developing points 331 at both ends are tilted upwards.

[0067] During the procedure, the fixed imaging point 331 of the fixed stent segment 300 changes in a clear sequence, namely, it successively undergoes no folding, partial folding, complete folding, and excessive folding. When the skirt structure 260 is retracted and anchored, the fixed imaging point 331 of the fixed stent segment 300 successively undergoes excessive folding, complete folding, and partial folding.

[0068] Therefore, during the procedure, the operator can observe the changes in the posture of the fixed imaging point 331 to monitor the folding state of the fixed stent segment 300, thus avoiding misoperation or prematurely ending the procedure before the fixed stent segment 300 reaches the preset shape. If the fixed stent segment 300 is not placed in the preset posture, it can easily cause the branch stent 100 to move into the branch vessel 600, posing a risk of endoleak in the branch, and in severe cases, even the risk of the branch stent 100 dislodging into the branch vessel 600. The technical solution described in this application ensures that the fixed stent segment 300 is set in the preset posture, thereby avoiding the aforementioned adverse results.

[0069] During intraoperative observation, first adjust the equipment so that any two opposite fixed imaging points 331 are at approximately their maximum spacing, then observe the shape of the fixed imaging points 331 at both ends. This allows for accurate determination of the skirt shape at both ends. To observe the skirt shape at other locations, simply adjust the equipment to position the fixed imaging point 331 at that location to either end. After the initial adjustment, to observe the skirt shape at other locations from a different angle, simply rotate the viewing angle by 90 degrees. The observation method is convenient.

[0070] Furthermore, such as Figures 9 to 11 As shown, the fixed developing point 331 is fixed to the fixed support section 300, or the fixed developing point 331 is a developing wire 332 spirally wound on the fixed support section 300. The fixed developing point 331 can also be other shapes, such as an "O" shape. Specifically, the fixed developing point 331 can be fixed to the fixed support section 300 by welding or sewing, or by using a filamentous developing wire 332 wound and fixed to the fixed support section 300. The fixed developing point 331 can be made of tantalum or platinum, or other materials with developing properties.

[0071] Combination Figure 3As shown, the sealing stent section 400 includes a sealing section stent 410 and a sealing section covering film 420 arranged on the sealing section stent 410, and the developing structure 270 further includes a plurality of sealing developing points 430 arranged on the sealing section stent 410, and the plurality of sealing developing points 430 are arranged uniformly in the circumferential direction on the sealing section stent 410.

[0072] The sealing developing points 430 are arranged on the sealing section stent 410 to observe the posture of the sealing stent section 400, so as to prevent the sealing stent section 400 from being folded when the branch stent 100 is released, which is caused by the sheath of the delivery device or the blood vessel stent 700 of the aorta 500, so that the sealing stent section 400 cannot seal the branch opening 720, and further causes the operation to fail.

[0073] The sealing section stent 410 is partially hook-connected with the main body stent 210, the sealing section stent 410 is hook-connected with the fixed section stent 310, the sealing section covering film 420 is integrally formed with the fixed section covering film 320, and the sealing section covering film 420 is fixedly connected with the main body covering film 220 after being heat fused.

[0074] The main body stent 210 includes a plurality of main body wave circles 211 arranged in sequence, and the plurality of main body wave circles 211 are hook-connected through adjacent main body wave circles 211. Figure 2 As shown, the main body wave circles 211 can also be arranged at intervals and connected through the stent covering film.

[0075] The sealing section stent 410 includes a plurality of sealing wave circles 440 connected in sequence, and when the number of the sealing wave circles 440 is multiple, adjacent sealing wave circles 440 are hook-connected. The sealing stent section 400 is arranged in a conical shape, and the smaller-diameter end of the sealing stent section 400 is connected to the main body stent 210, and the part of the sealing stent section 400 connected to the main body stent 210 is hook-connected through the sealing wave circles 440 and the main body wave circles 211. In other embodiments, there can be a preset interval between the sealing wave circles 440 and the main body wave circles 211, and the sealing section covering film 420 is connected with the main body covering film 220 to connect the sealing stent section 400 and the main body stent 210.

[0076] The fixed section stent 310 includes a plurality of fixed wave circles 340 connected in sequence, and when the number of the fixed wave circles 340 is multiple, adjacent fixed wave circles 340 are hook-connected. The larger-diameter end of the sealing stent section 400 is connected to the fixed stent section 300, and the part of the sealing stent section 400 connected to the fixed stent section 300 is hook-connected through the sealing wave circles 440 and the fixed wave circles 340.

[0077] The main wave ring 211, the sealing wave ring 440 and the fixed wave ring 340 are all memory alloy wires, and in the embodiment, memory alloy nickel-titanium wires are selected. The sealing section film 420 and the fixed section film 320 are integrally formed, and the sealing section film 420 is fixedly connected after being heat fused with the main film 220. The film structures of the application all adopt PTFE films.

[0078] In the embodiment, the wire diameter of the sealing section stent 410 and the fixed section stent 310 is smaller than that of the main stent 210. By setting the wire diameter of the sealing section stent 410 and the fixed section stent 310 to be smaller than that of the main stent 210, the outer diameter size of the branch stent 100 after compression is reduced, and the difficulty of assembling the branch stent 100 is reduced. Moreover, the radial support force of the sealing section stent 410 with a smaller wire diameter is smaller, and the stimulation to the inner wall of the branch blood vessel 600 after implanting the branch blood vessel 600 is smaller. At the same time, the hardness of the fixed section stent 310 with a smaller wire diameter is smaller, which is beneficial to the folding of the fixed section stent 300.

[0079] Further, as shown in Figure 12 and Figure 13 The main stent 210 includes a film stent section 230 provided with a main film 220 and a bare stent section 240 located at the end of the main stent 210 and arranged bare, and the bare stent section 240 is provided with a reinforcing wire 250, and the reinforcing wire 250 is wound on the bare stent section 240.

[0080] The embodiment can increase the friction of the bare stent section 240 by winding the reinforcing wire 250 on the bare stent section 240, so that greater anchoring force can be obtained when the branch stent 100 is loaded into the sheath, and displacement of the branch stent 100 when released from the delivery sheath is avoided, resulting in inaccurate release position.

[0081] The reinforcing wire 250 can be a developing wire with developing performance, so that after the branch stent 100 is released, the position of the end of the branch stent 100 can be determined by observing the reinforcing wire 250 with developing performance, assisting the doctor to implant the branch stent 100.

[0082] At the same time, the doctor can determine whether the sealing stent section 410 is correctly unfolded by observing the relative positions of the reinforcing wire 250 and the sealing developing point 430 on the sealing stent section 410 at the same time. When the relative position of the sealing developing point 430 relative to the reinforcing wire 250 is within a preset range, it indicates that the sealing stent section 410 is located at the correct unfolding position.

[0083] If the relative position of the sealing development point 430 to the reinforcing wire 250 deviates from the preset range, especially if the distance between the sealing development point 430 and the reinforcing wire 250 is too short, it indicates that the sealing stent segment 430 is in an over-folded state. The sealing stent segment 430 in the over-folded state cannot effectively seal the opening of the branch stent 100, which may cause serious medical accidents. At this time, the branch stent 100 needs to be adjusted in time.

[0084] Therefore, by winding the reinforcing wire 250 on the bare stent segment 240, on the one hand, the anchoring force between the branch stent 100 and the delivery device can be enhanced, avoiding displacement of the branch stent 100 when released from the delivery sheath, resulting in inaccurate release position. On the other hand, it can also serve as a position reference for the development structure 300 to assist the doctor in judgment to ensure the smooth progress of the operation.

[0085] In summary, according to the branch stent 100 in the present application, it can be placed at the branch opening 720 of the blood vessel stent 700 to establish a passage for the branch blood vessel 600, and the sealing stent segment 400 can seal the branch opening 720 of the blood vessel stent 700 to prevent internal leakage. Secondly, the fixed stent segment 300 can be folded, and the fixed stent segment 300 automatically folds after being released from the delivery sheath to prevent the branch stent 100 from moving. In addition, the development structure 270 is arranged on the skirt structure 260 to display the state of the skirt structure 260 after being released from the delivery sheath, which is convenient for the operator to observe.

[0086] Embodiment Two

[0087] Embodiment Two of the present application provides a branch stent, as shown in the figure, Figure 14 The same as Embodiment One is not repeated, and the difference between Embodiment Two and Embodiment One is that the fixed development point 331 can also be designed as a "V" shape, and the observation and judgment are the same as the "I" shape fixed development point 331.

[0088] For example, when the fixed development point 331 on the fixed stent segment 300 is in the shape of "V", the device is first adjusted so that any opposite fixed development points 331 are at the maximum distance, and then the shape of the fixed development points 331 at both ends is observed, which can accurately judge the shape of the fixed stent segment 300.

[0089] When the fixed stent segment 300 is not folded, as shown in the figure, Figure 14 At this time, the fixed development point 331 on the fixed stent segment 300 is observed from the side, the fixed development point 331 in the middle shows a complete "V" shape, and the fixed development points 331 at both ends show a "V" shape with a smaller included angle.

[0090] When the fixed stent segment 300 is partially folded, as shown in the figure,Figure 15 As shown, when viewed from the side, the fixed developing point 331 on the fixed support section 300 is shown in a shortened "V" shape at the middle part, and the fixed developing points 331 at both ends are shown in a "V" shape with a smaller included angle.

[0091] When the fixed support section 300 is completely folded, as Figure 16 and Figure 18 As shown, when viewed from the side, the fixed developing points 331 on the fixed support section 300 are reduced to dots, while the fixed developing points 331 at both ends are displayed as stripes and are basically perpendicular to the support body 200.

[0092] When the fixed bracket section 300 is excessively folded, such as Figure 17 As shown, when viewed from the side, the fixed developing point 331 on the fixed support section 300 is displayed in an inverted "V" shape, and the fixed developing points 331 at both ends are displayed in an inverted "V" shape with a smaller included angle.

[0093] The operator can determine the current posture of the fixed stent segment 300 by observing the different states of the fixed imaging point 331, and keep track of the flipping state of the fixed stent segment 300 at any time, which facilitates subsequent operations and ensures the success rate of the surgery.

[0094] In other embodiments, the fixed development point 331 can also be any other shape that allows for observation of shape changes, such as a figure-eight, an O, or other structures.

[0095] Example 3

[0096] Embodiment 3 of this application provides a branch support, such as Figure 19 and Figure 20 As shown, the similarities between Embodiment 3 and Embodiment 1 will not be repeated. The difference between Embodiment 3 and Embodiment 1 is that the developing structure 270 includes a fixed developing part 330 disposed on the fixed section support 310 and / or an end developing part 340 disposed on the fixed section coating 320.

[0097] Currently, the branch stent 100 is used not only in fenestration procedures but also in chimney procedures. In this embodiment, the branch stent 100 is used in the chimney procedure. In the chimney procedure, the vascular stent 700 for the aorta 500 includes a main lumen 710 and a branch lumen 730 disposed on one side of the main lumen 710. The branch lumen 730 is usually circular or elliptical. In special cases, the branch lumen 730 can also be rhomboid or other irregular shapes.

[0098] The branch stent 100 is arranged in the branch cavity 730, and the skirt structure 260 on the branch stent 100 mainly plays a plugging role to prevent internal leakage. Therefore, in the chimney procedure, whether the skirt structure 260 is completely unfolded and adheres to the wall is a key to determine whether the operation is successful, and therefore the sealing condition of the skirt structure 260 is one of the important problems that the doctor is concerned about.

[0099] In the operation, first, the vascular stent 700 of the aorta 500 is placed at the lesion of the aorta 500, and then the branch stent 100 is placed at the opening of the vascular stent 700, that is, the branch cavity 730, and the distal end of the branch stent 100 is connected to the branch blood vessel 600 to establish a channel. Among them, the edge of the skirt structure 260 of the branch stent 100 is required to be roughly aligned with the edge of the covering film of the vascular stent 700 of the aorta 500.

[0100] Therefore, as shown in the drawings, Figures 20 to 21 the embodiment sets the developing structure 270 on the skirt structure 260, specifically sets the fixed developing part 330 on the fixed segment stent 310, or sets the end developing part 340 on the fixed segment covering film 320, or sets both the fixed developing part 330 on the fixed segment stent 310 and the end developing part 340 on the fixed segment covering film 320.

[0101] In the embodiment, the fixed developing part 330 is arranged at the end edge of the fixed segment stent 310 close to the fixed stent segment 300 to display the position of the end edge of the fixed stent segment 300, and the fixed developing part 330 includes a plurality of fixed developing points 331 arranged on the fixed segment stent 310 in a circumferential direction. In the embodiment, the plurality of fixed developing points 331 are evenly arranged on the fixed segment stent 310 in the circumferential direction.

[0102] Among them, the fixed developing point 331 can be fixed on the fixed segment stent 310 by welding or sewing, or the fixed developing point 331 can also be a developing wire 332, which is fixed on the fixed segment stent 310 by winding.

[0103] The end developing part 340 includes a plurality of end developing points 341 arranged on the fixed segment covering film 320 in a circumferential direction, and the end developing point 341 is arranged at the end edge of the fixed segment covering film 320 to display the position of the end edge of the fixed stent segment 300. Among them, the end developing point 341 is fixed on the fixed segment covering film 320 by sewing. In the embodiment, the plurality of end developing points 341 are evenly arranged on the edge of the fixed segment covering film 320 in the circumferential direction.

[0104] In other embodiments, as shown in the drawings, Figure 22As shown, the end developing part 340 can also include a developing ring 342 arranged at the end edge of the fixed segment covering film 320, and the position of the end edge of the fixed segment stent 300 is displayed through the developing ring 342. Wherein, the developing ring 342 is fixed on the fixed segment covering film 320 by suturing with a suture.

[0105] In summary, the embodiment shows the shape of the skirt structure 260 after expansion through the fixed developing part 330 on the fixed segment stent 310 and / or the end developing part 340 arranged on the fixed segment covering film 320, so that the operator can intuitively see whether the skirt structure 260 seals the branch cavity 730 after the release of the branch stent 100, and assist subsequent operations to ensure the success of the operation.

[0106] Embodiment Four

[0107] Embodiment Four of the present application provides a branch stent 100, as shown in the accompanying drawings, Figure 23 As shown in the accompanying drawings, Figure 24 As shown, the embodiment four and the embodiment three are the same and will not be repeated, and the difference between the embodiment four and the embodiment three is that the fixed developing part 330 includes fixed developing points 331 arranged on both sides of the fixed segment stent 310, and one or more fixed developing points 331 can be arranged on each side. Alternatively, the end developing part 340 includes end developing points 341 arranged on both sides of the fixed segment covering film 320, and one or more end developing points 341 can be arranged on each side.

[0108] The above-mentioned embodiments are suitable for branch cavities 730 in the shape of an ellipse, and since the branch stent 100 will fit on the inner wall of the branch cavity 730 after being placed in the branch cavity 730 and maintain the same shape as the branch cavity 730. Therefore, when the branch cavity 730 is in the shape of an ellipse, there is a risk of poor sealing at the long axis edge of the cross section of the branch cavity 730.

[0109] The embodiment shows the long axis end position of the skirt structure 260 after compression through the fixed developing part 330 or the end developing part 340 after the branch stent 100 is compressed, so as to ensure that the skirt structure 260 of the branch stent 100 and the branch cavity 730 of the blood vessel stent 700 are sealed, and to avoid internal leakage.

[0110] During the specific implantation process of the branch stent 100, the branch stent 100 needs to be assembled in a specific circumferential direction, so that the developing structures 270 arranged on both sides of the skirt structure 260 are respectively located at the long axis top points of the ellipse after the release of the branch stent 100 through the control of the circumferential angle of the delivery device.

[0111] Since the fixed developing part 330 and the end developing part 340 for displaying the position are arranged at the end edges of the fixed support section 300, the position of the branch stent 100 can be judged by the doctor, the accuracy of the positioning is ensured, and the deformation shape of the skirt structure 260 can be observed on the end face, so that whether the skirt structure 260 is completely unfolded and adheres to the wall can be judged, and the success of the operation is ensured.

[0112] The above merely describes the preferred embodiments of the present application, but the protection scope of the present application is not limited to this. Any changes or replacements within the technical scope disclosed by the present application can be easily thought by those skilled in the art, and should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A branched stent, characterized by, The stent comprises a stent body and a skirt structure arranged on the stent body, the stent body comprises a main stent body and a main film arranged on the main stent body; the skirt structure comprises a sealing stent segment connected to the main stent body and a fixed stent segment connected to the sealing stent segment, and the skirt structure is provided with a developing structure; The fixed stent segment comprises a fixed segment stent and a fixed segment film arranged on the fixed segment stent, and the developing structure comprises a fixed developing part arranged on the fixed segment stent and / or an end developing part arranged on the fixed segment film; The fixed developing part comprises a plurality of fixed developing points arranged on the fixed segment stent in a circumferential direction; The end developing part comprises a plurality of end developing points arranged on the fixed segment film in a circumferential direction, and the end developing points are arranged at the end edge of the fixed segment film; or the end developing part comprises a developing ring arranged at the end edge of the fixed segment film; The sealing stent segment comprises a sealing segment stent and a sealing segment film arranged on the sealing segment stent, and the developing structure further comprises a plurality of sealing developing points arranged on the sealing segment stent, and the sealing developing points are arranged on the sealing segment stent in a circumferential direction.

2. The branched stent of claim 1, wherein, The fixed developing points are welded or stitched on the fixed stent segment, or the fixed developing points are developing wires spirally wound on the fixed stent segment.

3. The branched stent of claim 1, wherein, The sealing stent segment is arranged in a conical shape.

4. The branched stent of claim 1, wherein, The sealing segment stent is hook-connected to the fixed segment stent, and the sealing segment film is integrally formed with the fixed end film.

5. The branched stent of claim 1, wherein, The sealing segment stent is hook-connected to the main stent body, and the sealing segment film is fixedly connected to the main film after being heat-fused.

6. The branched stent of claim 1, wherein, The wire diameter of the sealing segment stent and the fixed segment stent is smaller than the wire diameter of the main stent body.

7. The branched stent of claim 1, wherein, The main stent body comprises a film stent segment provided with the main film and a bare stent segment arranged at the end of the main stent body and exposed, and the bare stent segment is provided with a reinforcing wire wound thereon.

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