Covered cannula, branch sheath and delivery system

Abstract

The invention relates to a covered cannula, a branch sheath and a delivery system, a cannula body is provided with a cannula inner cavity, the near end and the far end of the cannula body are provided with a near-end tube opening and a far-end tube opening which are communicated with the cannula inner cavity, the cannula body is provided with a connecting area, and the strength of the connecting area is larger than that of other areas in the cannula body; the binding structure is connected with the connecting area and used for connecting the cannula body with the main body support. The covered cannula is used for binding the branch stent and is directly connected with the main stent, and the binding structure of the covered cannula is used as an intermediate connecting structure, so that the branch stent, the covered cannula and the main stent can be firmly connected; the covered sleeve is always connected with the main body stent, so that the covered sleeve is always and firmly wrapped on the branch stent, the covered sleeve is not easy to be separated from the branch stent, and the protection of the branch stent and the accurate alignment of branches are realized.

Description

Technical Field

[0001] The present application relates to the field of medical device technology, and in particular to a coated cannula, a branch sheath, and a delivery system. Background Art

[0002] With the development of intravascular devices and interventional treatment procedures, intravascular stent implantation has become a common treatment for aortic diseases such as aortic dissection, true and false aneurysms, and penetrating aortic ulcers. The principle is to deliver the covered stent into the lesion site through an adaptive delivery system and then expand it to isolate the tumor, rupture or dissection from the blood, eliminating the risk of death caused by aneurysm rupture and dissection expansion bleeding.

[0003] Vascular stents are used in arteries with branched blood vessels, such as the aortic arch, descending aorta, and abdominal aorta, especially in the arch. For cases where lesions involve the branches above the arch, there are some branched covered stents, such as single-branch stents, two-branch stents, and three-branch stents. Although the branched covered stents can expand their indications to lesions on the aortic arch, the safe implantation and accurate release of the branched covered stents have always been issues that need to be solved and optimized. The accurate positioning and release of the branched covered stents also largely determine the success rate of the operation.

[0004] Due to the differences in vascular anatomical characteristics among different patients, the part of the branch stent that enters the body needs to be adjusted for alignment. However, in the process of adjusting the branch stent, the branch sheath that plays a protective role on the branch stent can easily fall out of the branch stent. The falling out of the branch sheath will result in the branch stent being without the protection of the branch sheath, thereby damaging the blood vessel and causing severe localized dissection. Furthermore, if the branch stent is not bound or restrained, the outer diameter of the branch stent will increase, increasing the difficulty of the branch stent entering the branch blood vessel, resulting in inaccurate positioning of the branch stent. In severe cases, it may even be impossible to introduce it, resulting in failure of the release of the branch stent. Summary of the invention

[0005] Based on this, it is necessary to provide a coated cannula, a branch sheath and a delivery system to address the above-mentioned technical problems.

[0006] The present application provides a coated sleeve for a branch sheath, the coated sleeve comprising:

[0007] A cannula body, wherein the cannula body has a cannula inner cavity, and the proximal end and the distal end of the cannula body have a proximal tube opening and a distal tube opening communicating with the cannula inner cavity;

[0008] The binding structure comprises a connecting area of ​​the sleeve body, the strength of the connecting area is greater than the strength of other areas in the sleeve body, the binding structure is connected to the connecting area of ​​the sleeve body, and the binding structure is used to connect the sleeve body to the main support.

[0009] In one embodiment, the binding structure comprises a binding coil, and the binding coil is connected to the distal end of the sleeve body; or,

[0010] The restraint structure comprises a restraint extension section, which is located at the distal end of the sleeve body and is an integrally formed structure with the sleeve body.

[0011] In one embodiment, the distal end of the sleeve body has a first connection area, the strength of the first connection area is greater than the strength of other areas in the sleeve body, and the binding coil is connected to the first connection area; or,

[0012] The distal end of the constrained extension segment has a second connection region, and the strength of the second connection region is greater than the strength of other regions in the constrained extension segment.

[0013] In one embodiment, the first connection area is provided with a first connection through hole, and the binding coil is connected to the first connection area through the first connection through hole;

[0014] Alternatively, the second connection area is provided with a second connection through hole, and the second connection through hole is used for connecting to the main body bracket.

[0015] In one embodiment, the first connection region is provided with a first reinforcement film layer, and the first reinforcement film layer is used to improve the strength of the first connection region; or,

[0016] The second connection region is provided with a second reinforcement film layer, and the second reinforcement film layer is used to improve the strength of the second connection region.

[0017] In one embodiment, the proximal end of the first reinforcement film layer is connected to the distal end of the sleeve body, and the first reinforcement film layer is folded toward the proximal end and laminated and fixed in the first connection area to improve the strength of the first connection area; or,

[0018] The proximal end of the second reinforcement film layer is connected to the distal end of the restraining extension section, and the second reinforcement film layer is folded toward the proximal end and laminated and fixed in the second connection area to improve the strength of the second connection area.

[0019] In one embodiment, the sleeve body comprises at least two sequentially connected unit sleeve segments in the direction from the proximal tube opening to the distal tube opening, wherein at least the unit sleeve segment located at the farthest end is a conical tube body.

[0020] The present application provides a branch sheath, the branch sheath comprising:

[0021] Control frame;

[0022] The film-coated sleeve is assembled on the control frame.

[0023] In one embodiment, the control frame includes:

[0024] A fixed catheter, the fixed catheter having a catheter lumen and a proximal catheter port and a distal catheter port communicating with the catheter lumen, the coated sleeve being mounted on the fixed catheter;

[0025] A traction wire, the traction wire is passed through the inner cavity of the fixed catheter;

[0026] A limiting component is located at the distal end of the fixed catheter, the distal end of the traction wire is connected to at least one of the fixed catheter and the limiting component, and the limiting component is located in the inner cavity of the coated sleeve to limit the separation of the fixed catheter from the coated sleeve.

[0027] In one embodiment, the control frame includes:

[0028] The adapter sleeve has a diameter that gradually increases in the direction from the proximal tube opening to the distal tube opening, the proximal end of the adapter sleeve is connected to the fixed catheter, and the coated sleeve is fixedly sleeved in the inner cavity of the adapter sleeve.

[0029] In one embodiment, the sleeve body comprises at least two unit sleeve segments connected in sequence in the direction from the proximal tube opening to the distal tube opening, the transition sleeve and the unit sleeve segments are both conical tube bodies, and the transition sleeve is sleeved on the unit sleeve segment located at the nearest end among the multiple unit sleeve segments.

[0030] The present application provides a delivery system, which includes the coated sleeve, or the delivery system includes the branch sheath.

[0031] In the above-mentioned coated sleeve, branch sheath and delivery system, the restraining structure is directly connected to the sleeve body, so that the restraining structure and the sleeve body can move synchronously and will not separate from each other. When the coated sleeve is applied to the branch sheath to control the branch stent, the branch stent will be restrained in the sleeve body of the coated sleeve, and the coated sleeve and the main stent will be directly connected through the restraining structure. When the branch stent moves with the main stent in multiple directions such as up, down, left and right, the branch stent will move with the sleeve body, and the sleeve body will move synchronously with the restraining structure. In this process, the coated sleeve is used to restrain the branch stent, and the coated sleeve is directly connected to the main stent. With the help of the restraining structure of the coated sleeve as an intermediate connection structure, a firm connection can be formed between the branch stent, the coated sleeve and the main stent. The connection between the coated sleeve and the main stent ensures that the coated sleeve will always firmly wrap the branch stent, making it difficult for the coated sleeve to fall off the branch stent, thereby achieving protection of the branch stent and accurate alignment of the branch. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 A schematic diagram of the structure of a coated sleeve provided in one embodiment of the present application.

[0033] Figure 2 A schematic diagram of a suturing method for a first suture provided in an embodiment of the present application.

[0034] Figure 3 This is a schematic diagram of another suturing method for the first suture provided in one embodiment of the present application.

[0035] Figure 4 A schematic diagram of the folding process of the first reinforcement film layer provided in one embodiment of the present application.

[0036] Figure 5 This is a schematic diagram of the structure of a branch sheath provided in one embodiment of the present application.

[0037] Figure 6 This is a schematic diagram of the internal structure of a branch sheath provided in one embodiment of the present application.

[0038] Figure 7 This is a schematic structural diagram of a coated sleeve provided in another embodiment of the present application.

[0039] Figure 8 A schematic diagram of a suturing method for a second suture provided in another embodiment of the present application.

[0040] Fig. 9 This is a schematic diagram of another suturing method for the second suture provided in another embodiment of the present application.

[0041] Fig.10This is a schematic diagram of the folding process of the first reinforcement film layer provided in another embodiment of the present application.

[0042] Fig.11 This is a schematic diagram of the structure of a branch sheath provided in another embodiment of the present application.

[0043] Fig.12 This is a schematic diagram of the internal structure of a branch sheath provided in another embodiment of the present application.

[0044] Fig.13 This is a schematic diagram of the structure of a control frame provided in one embodiment of the present application.

[0045] Figure Number:

[0046] 1000, casing body; 2000, restraint structure; 3000, control frame;

[0047] 1000a, unit casing section;

[0048] 2100, binding coil; 2200, binding extension section;

[0049] 2100a, first connection area; 2100b, first connection through hole; 2100c, first reinforcement film layer; 2100d, first suture line;

[0050] 2200a, second connection area; 2200b, second connection through hole; 2200c, second reinforcement film layer; 2200d, second suture line;

[0051] 3100, fixed catheter; 3200, traction wire; 3300, limiting component; 3400, adapter sleeve. DETAILED DESCRIPTION

[0052] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0053] In the description of the present application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0054] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0055] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0056] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0057] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only implementation method.

[0058] In order to more clearly describe the coated cannula, branch sheath and delivery system, the term "distal end" is defined here to mean the end away from the operator during the surgical operation, that is, the end close to the main support, and the "proximal end" means the end close to the operator during the surgical operation. Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as those commonly understood by technicians in the technical field of this application. The terms used in this application in the specification are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0059] See also Figure 1 As shown, an embodiment of the present application provides a coated sleeve for a branch sheath, the coated sleeve comprising a sleeve body 1000 and a restraining structure 2000, wherein the sleeve body 1000 has a sleeve lumen, and the proximal end and the distal end of the sleeve body 1000 have a proximal tube opening and a distal tube opening connected to the sleeve lumen, so that the sleeve body 1000 is constructed as a tube body structure with two ends connected, see Figure 1 In the proximal and distal directions shown in , the proximal tube opening is the tube opening at the proximal end of the sleeve body 1000, and the distal tube opening is the tube opening at the distal end of the sleeve body 1000. The diameter of the proximal tube opening of the sleeve body 1000 is smaller than the diameter of the distal tube opening. Therefore, in the direction from the proximal tube opening to the distal tube opening, the diameter change of the sleeve body 1000 can be in various forms. For example, the diameter of the sleeve body 1000 gradually increases in the direction from the proximal tube opening to the distal tube opening. The gradually increasing diameter can provide a surface that helps to dislodge the inclined tube body during the disengagement process, reduce resistance, and facilitate the disengagement of the coated sleeve from the branch stent. Alternatively, the diameter of the sleeve body 1000 can be gradually increased in stages in the direction from the proximal tube opening to the distal tube opening, and the diameter can be kept unchanged in stages. Those skilled in the art can construct the diameter change of the sleeve body 1000 according to actual needs, which is not limited here.

[0060] The binding structure 2000 is connected to the sleeve body 1000, wherein the sleeve body 1000 has a connection area, the binding structure 2000 is connected to the connection area of ​​the sleeve body 1000, the strength of the connection area is greater than the strength of other areas in the sleeve body 1000, and the binding structure 2000 is used to connect the sleeve body 1000 to the main support.

[0061] The sleeve body 1000 can be an integrated cylindrical shape or a cone with a taper at one end. In addition, it can also be a non-integrated multiple monomer structure, which is formed into a cylindrical shape or a cone with a taper at one end through sewing or other connections. The gradually increasing diameter of the sleeve body 1000 may be gradually increased uniformly or according to a certain rule. For example, in one embodiment, the sleeve body 1000 includes at least two sequentially connected unit sleeve segments 1000a in the direction from the proximal tube mouth to the distal tube mouth, and at least the unit sleeve segment 1000a located at the proximal end is a conical tube body. For example, the unit sleeve segment 1000a at the farthest end is a conical tube body, and the remaining unit sleeve segments 1000a may adopt a conical tube body or a straight tube body, etc. When all the unit sleeve segments 1000a are conical tube bodies, the taper of each unit sleeve segment 1000a can be set according to needs. For example, the conical taper of multiple unit sleeve segments 1000a increases in sequence in the direction from the proximal tube mouth to the distal tube mouth, first becomes larger and then becomes smaller, and other tapered variation forms. Those skilled in the art can set the taper of each unit sleeve segment 1000a according to specific needs such as easy removal, and are not limited here.

[0062] See also Figure 1 As shown, in the direction from the proximal tube opening to the distal tube opening, there are three unit sleeve segments 1000a connected in sequence, each unit sleeve segment 1000a adopts a conical tube body, and each unit sleeve segment 1000a has its own conical taper, the conical taper of the unit sleeve segment 1000a at the nearest end is the smallest, the conical taper of the middle unit sleeve segment 1000a is larger than the conical taper of the unit sleeve segment 1000a at the nearest end, and the conical taper of the unit sleeve segment 1000a at the farthest end is larger than the conical taper of the middle unit sleeve segment 1000a, thereby constituting three unit sleeve segments 1000a with gradually increasing conical tapers to form a complete sleeve body 1000.

[0063] Continue reading Figure 1As shown, the restraining structure 2000 is directly connected to the sleeve body 1000, so that the restraining structure 2000 and the sleeve body 1000 can move synchronously and will not separate from each other. When the coated sleeve is applied to the branch sheath to control the branch stent, the branch stent will be restrained in the sleeve body 1000 of the coated sleeve, and the coated sleeve is directly connected to the main stent through the restraining structure 2000. When the branch stent moves with the main stent in multiple directions such as up, down, left, and right, the branch stent will move with the sleeve body 1000. The sleeve body 1000 will move synchronously with the restraining structure 2000. During this process, the coated sleeve is used to restrain the branch stent, and the coated sleeve is directly connected to the main stent. Therefore, with the help of the restraining structure 2000 of the coated sleeve as an intermediate connection structure, a secure connection can be formed between the branch stent, the coated sleeve and the main stent. The coated sleeve is always connected to the main stent to ensure that the coated sleeve will always firmly wrap the branch stent, so that the coated sleeve is not easy to fall out of the branch stent, thereby protecting the branch stent and accurately aligning the branch. Moreover, since the restraining structure 2000 is on the sleeve body 1000, the restraining structure 2000 will not occupy the space in the sleeve lumen of the sleeve body 1000. The space in the sleeve lumen can be shrunk to a smaller diameter after the branch stent is assembled, reduced to below 5F, and the smaller diameter contraction state will reduce trauma to the patient.

[0064] The restraining structure 2000 can be in various forms, as long as it can match the shape of the sleeve body 1000 and achieve a stable connection between the sleeve body 1000 and the branch stent, such as Figures 1 to 6 As shown, the binding structure 2000 can be constructed as a coil structure, for example, the binding structure 2000 is a binding coil 2100, which can be a folded polymer wire, and the binding coil 2100 is connected to the distal end of the sleeve body 1000, and the sleeve body 1000 and the main support are stably connected by connecting the binding coil 2100 to the main support. Figures 7 to 12 As shown, the restraint structure 2000 can be constructed based on a partial extension of the sleeve body 1000. For example, the restraint structure 2000 adopts a restraint extension section 2200 extending from the sleeve body 1000. The restraint extension section 2200 is located at the distal end of the sleeve body 1000 and is formed as an integral structure with the sleeve body 1000. The sleeve body 1000 and the main support are stably connected by connecting the restraint extension section 2200 and the main support.

[0065] Continue reading Figure 1As shown, when the binding coil 2100 is used, it can pass through the binding wire of the main support to fix the sleeve body 1000 and the main support. After the main support releases the binding wire, the binding coil 2100 will also be immediately released, and at this time, the binding coil 2100 can be pulled out of the body by dragging. In one embodiment, the distal end of the sleeve body 1000 has a first connection area 2100a, which is a partial area divided on the sleeve body 1000, that is, the connection area of ​​the sleeve body 1000. The difference between the first connection area 2100a and other areas is that the strength of the first connection area 2100a is greater than the strength of other areas in the sleeve body 1000. The binding coil 2100 is connected to the first connection area 2100a. The higher strength can meet the reliable and stable connection between the binding coil 2100 and the sleeve body 1000, improve the service life, and will not be accidentally separated. The first connection area 2100a is provided with a first connection through hole 2100b. The first connection through hole 2100b is provided in the first connection area 2100a with higher strength, so that the overall strength of the sleeve body 1000 will not be reduced after the hole is opened. Moreover, after the binding coil 2100 is connected to the first connection area 2100a through the first connection through hole 2100b, the binding coil 2100 can also form a stable connection with the first connection area 2100a.

[0066] There are many ways to increase the strength of the first connection area 2100a, such as changing the material used in the area, increasing the number of layers or size of the material, etc., which are not limited here. For example, in one embodiment, the first connection area 2100a is provided with a first reinforcement film layer 2100c, and the first reinforcement film layer 2100c is used to improve the strength of the first connection area 2100a. The first reinforcement film layer 2100c can be an independent structure originally separated from the sleeve body 1000, and then the first reinforcement film layer 2100c is fixed to the first connection area 2100a by bonding, sewing, etc. to enhance the strength of the area, or as Figure 4 As shown, the first reinforcement film layer 2100c can also adopt a structure that is originally connected to the end of the sleeve body 1000. For example, the proximal end of the first reinforcement film layer 2100c is connected to the distal end of the sleeve body 1000, and the first reinforcement film layer 2100c is folded toward the proximal direction and laminated and fixed on the first connection area 2100a to improve the strength of the first connection area 2100a.

[0067] See also Figure 2 and Figure 3 As shown, no matter the first reinforcement film layer 2100c is an independent structure originally separated from the sleeve body 1000 or a structure originally connected to the sleeve body 1000 at the end, it can be connected by sewing, for example Figure 2As shown, the first suture line 2100d is sewn along the edge of the first reinforcement film layer 2100c for one or more circles, or as shown in FIG. Figure 3 As shown, the first suture line 2100d is sewn into multiple sections along the edge perpendicular to the first reinforcement film layer 2100c, and the multiple sewing sections surround the edge of the first reinforcement film layer 2100c. Those skilled in the art can use the above two methods or other methods to sew the first reinforcement film layer 2100c, which is not limited here.

[0068] Two binding structures 2000, i.e., two binding coils 2100, can be constructed at the distal end of the sleeve body 1000, so there are two first connection areas 2100a at the distal end of the sleeve body 1000. The number of layers of the first reinforcement film layer 2100c can be one or more layers. Since there are both the first reinforcement film layer 2100c and the binding coil 2100 in the first connection area 2100a, in order to reduce the increase in outer diameter caused by the stacking and superposition of the first reinforcement film layer 2100c and the binding coil 2100, the two first connection through holes 2100b can be staggered at radially symmetrical positions on the sleeve body 1000, and constructed at different distance height positions on the sleeve body 1000. The positions of the first suture lines 2100d can also be staggered and sewn, so as to reduce the increase in outer diameter caused by the stacking and superposition of the first reinforcement film layer 2100c and the binding coil 2100.

[0069] Continue reading Figure 7 As shown, when the restraint extension section 2200 is used, it can pass through the restraint guide wire of the main support to fix the sleeve body 1000 and the main support. After the main support is released from the restraint of the restraint guide wire, the restraint extension section 2200 will also be immediately released, and at this time, the restraint extension section 2200 can be pulled out of the body by dragging. In one embodiment, the distal end of the restraint extension section 2200 has a second connection area 2200a, which is a partial area divided on the restraint extension section 2200, that is, the connection area of ​​the sleeve body 1000. The difference between the second connection area 2200a and other areas is that the strength of the second connection area 2200a is greater than the strength of other areas in the restraint extension section 2200. The higher strength can meet the reliable and stable connection between the distal end of the restraint extension section 2200 and the main support, improve the service life, and prevent accidental separation. The second connection area 2200a is provided with a second connection hole 2200b. The second connection hole 2200b is provided in the second connection area 2200a with higher strength, so that the overall strength of the binding extension section 2200 will not be reduced after the hole is opened, and the second connection hole 2200b is used to connect to the main bracket to ensure the stability of the connection with the main bracket.

[0070] There are many ways to increase the strength of the second connection area 2200a, such as changing the material used in the area, increasing the number of layers or size of the material, etc., which are not limited here. For example, the second connection area 2200a is provided with a second reinforcement film layer 2200c, and the second reinforcement film layer 2200c is used to improve the strength of the second connection area 2200a. The second reinforcement film layer 2200c can be an independent structure originally separated from the restraining extension section 2200, and then the second reinforcement film layer 2200c is fixed to the second connection area 2200a by bonding, sewing, etc. to enhance the strength of the area, or as Fig.10 As shown, the second reinforcement film layer 2200c can also adopt a structure that is originally connected to the end of the restraining extension section 2200, for example, the proximal end of the second reinforcement film layer 2200c is connected to the distal end of the restraining extension section 2200, and the second reinforcement film layer 2200c is folded toward the proximal direction and laminated and fixed on the second connection area 2200a, so as to improve the strength of the second connection area 2200a.

[0071] See also Figure 8 and Fig. 9 As shown, no matter the second reinforcement film layer 2200c is an independent structure originally separated from the binding extension section 2200 or a structure originally connected to the binding extension section 2200 at the end, it can be connected by sewing, for example. Figure 8 As shown, the second suture line 2200d is sewn along the edge of the second reinforcement film layer 2200c for one or more circles, or as shown in FIG. Fig. 9 As shown, the second suture line 2200d is sewn along the edge perpendicular to the second reinforcement film layer 2200c into multiple sections, and the multiple sewing sections surround the edge of the second reinforcement film layer 2200c. Those skilled in the art can use the above two methods or other methods to sew the second reinforcement film layer 2200c, which is not limited here.

[0072] Two restraint structures 2000, i.e., two restraint extensions 2200, can be constructed at the distal end of the sleeve body 1000, and accordingly, two second connection areas 2200a are provided at the distal end of the restraint extension 2200. The number of layers of the second reinforcement film layer 2200c can be one or more layers. Since there is a second reinforcement film layer 2200c in the second connection area 2200a, in order to reduce the increase in outer diameter caused by the stacking of the second reinforcement film layer 2200c, the two second connection through holes 2200b can be staggered at radially symmetrical positions of the two restraint extensions 2200, and constructed at different distance height positions on the two restraint extensions 2200. The positions of the second sutures 2200d can also be staggered and sewn, so as to reduce the increase in outer diameter caused by the stacking of the second reinforcement film layer 2200c.

[0073] See also Figures 1 to 13As shown, the present application provides a branch sheath, which includes a control frame 3000 and a coated sleeve, and the coated sleeve is assembled on the control frame 3000. Figure 6 or Fig.13 As shown, the control frame 3000 can be in various forms. For example, in one embodiment, the control frame 3000 includes a fixed catheter 3100, a traction wire 3200 and a limiting component 3300. The fixed catheter 3100 has a catheter lumen and a proximal catheter port and a distal catheter port connected to the catheter lumen. The coated sleeve is assembled on the fixed catheter 3100. The traction wire 3200 is passed through the catheter lumen of the fixed catheter 3100. The limiting component 3300 is located at the distal end of the fixed catheter 3100. The distal end of the traction wire 3200 is connected to at least one of the fixed catheter 3100 and the limiting component 3300. The limiting component 3300 is located in the inner cavity of the coated sleeve, and is used to limit the separation of the fixed catheter 3100 from the coated sleeve.

[0074] The coated sleeve can be directly assembled and connected with the control frame 3000. For example, the coated sleeve can be sleeved on the outside of the fixed catheter 3100, and the proximal end of the coated sleeve is connected to the outer wall of the fixed catheter 3100 by hot melting or the like, or the coated sleeve can be indirectly assembled and connected with the control frame 3000. In one embodiment, the control frame 3000 includes a transition sleeve 3400, and the diameter of the transition sleeve 3400 gradually increases in the direction from the proximal tube opening to the distal tube opening. The proximal end of the transition sleeve 3400 is connected to the fixed catheter 3100, and the coated sleeve is fixedly sleeved in the inner cavity of the transition sleeve 3400.

[0075] The adapter sleeve 3400 can be a tapered tube body, and the adapter sleeve 3400 is connected to the fixed catheter 3100 by hot melting or the like, thereby indirectly fixing the coated sleeve to the fixed catheter 3100. The traction wire 3200 can be a single metal wire, and the wire diameter of the traction wire 3200 is between 0.014 inches and 0.035 inches. The single traction wire 3200 with a thicker wire diameter has strong force conductivity and support, and prevents the branch sheath from being folded when passing through a side branch vessel with a larger angle, making it impossible to introduce the branch stent. The fixed catheter 3100 can be an isodiameter polymer tube, which is fixed to the distal end of the traction wire 3200 by hot melting or the like, and can be closely fitted with the traction wire 3200 after hot melting. The limiting component 3300 can be a spherical structure or a quasi-spherical structure, and the limiting component 3300 can be made of metal. The limiting component 3300 is formed at the distal end of the traction wire 3200 by welding or the like, and is fixed at the distal end of the traction wire 3200. When the traction wire 3200 is dragged from the proximal end, the limiting component 3300 can prevent the traction wire 3200 and the fixed catheter 3100 from falling out, thereby improving the connection strength between the coated sleeve and the control frame 3000, and preventing the fixed catheter 3100 from falling out due to the pulling force of the main support.

[0076] In one embodiment, the sleeve body 1000 includes at least two sequentially connected unit sleeve segments 1000a in the direction from the proximal tube opening to the distal tube opening, for example, there are three sequentially connected unit sleeve segments 1000a in the direction from the proximal tube opening to the distal tube opening, each unit sleeve segment 1000a adopts a conical tube body, and each unit sleeve segment 1000a has its own conical taper, the conical taper of the most proximal unit sleeve segment 1000a is the smallest, the conical taper of the middle unit sleeve segment 1000a is larger than the conical taper of the most proximal unit sleeve segment 1000a, and the conical taper of the most distal unit sleeve segment 1000a is smaller than the conical taper of the middle unit sleeve segment 1000a, thereby constituting three unit sleeve segments 1000a whose conical taper first increases and then decreases, forming a complete sleeve body 1000. At this time, the adapter sleeve 3400 is sleeved on the nearest unit sleeve section 1000a, so the conical taper of the adapter sleeve 3400 matches the nearest unit sleeve section 1000a.

[0077] It should be noted that, among the three sequentially connected unit sleeve segments 1000a, only the unit sleeve segment 1000a at the farthest end may be a conical tube body, and the other two unit sleeve segments 1000a do not use a conical tube body, wherein the middle unit sleeve segment 1000a serves to transitionally connect the unit sleeve segments 1000a at both ends, and it may use a conical tube body or a straight tube body, and the unit sleeve segment 1000a at the nearest end may also use a conical tube body or a straight tube body, and when the unit sleeve segment 1000a at the nearest end uses a conical tube body, it can facilitate the release of the stent when it is released. The specific tube form of each unit sleeve segment 1000a can be set according to demand, and those skilled in the art can set the tube structure and taper of each unit sleeve segment 1000a according to specific requirements such as transition connection and easy release, which are not limited here.

[0078] The present application provides a delivery system, the delivery system includes a coated cannula, or the delivery system includes a branch sheath. Since the specific structure, functional principle and technical effect of the coated cannula and the branch sheath are described in detail in the previous text, they will not be repeated here. Any technical content related to the coated cannula and the branch sheath can refer to the previous records.

[0079] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0080] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A coated sleeve for a branch sheath, characterized in that: The coated casing comprises: A cannula body, wherein the cannula body has a cannula inner cavity, and the proximal end and the distal end of the cannula body have a proximal tube opening and a distal tube opening communicating with the cannula inner cavity; The binding structure comprises a connecting area of ​​the sleeve body, the strength of the connecting area is greater than the strength of other areas in the sleeve body, the binding structure is connected to the connecting area of ​​the sleeve body, and the binding structure is used to connect the sleeve body to the main support.

2. The film-coated casing according to claim 1, characterized in that: The binding structure comprises a binding coil, and the binding coil is connected to the distal end of the sleeve body; or, The restraint structure comprises a restraint extension section, which is located at the distal end of the sleeve body and is an integrally formed structure with the sleeve body.

3. The film-coated casing according to claim 2, characterized in that: The distal end of the sleeve body has a first connection area, the strength of the first connection area is greater than the strength of other areas in the sleeve body, and the binding coil is connected to the first connection area; or, The distal end of the constrained extension segment has a second connection region, and the strength of the second connection region is greater than the strength of other regions in the constrained extension segment.

4. The film-coated casing according to claim 3, characterized in that: The first connection area is provided with a first connection through hole, and the binding coil is connected to the first connection area through the first connection through hole; Alternatively, the second connection area is provided with a second connection through hole, and the second connection through hole is used for connecting to the main body bracket.

5. The film-coated casing according to claim 4, characterized in that: The first connection region is provided with a first reinforcement film layer, and the first reinforcement film layer is used to improve the strength of the first connection region; or, The second connection region is provided with a second reinforcement film layer, and the second reinforcement film layer is used to improve the strength of the second connection region.

6. The film-coated casing according to claim 5, characterized in that: The proximal end of the first reinforcement film layer is connected to the distal end of the sleeve body, and the first reinforcement film layer is folded toward the proximal end and laminated and fixed in the first connection area to improve the strength of the first connection area; or, The proximal end of the second reinforcement film layer is connected to the distal end of the restraining extension section, and the second reinforcement film layer is folded toward the proximal end and laminated and fixed in the second connection area to improve the strength of the second connection area.

7. The film-coated casing according to claim 1, characterized in that: The sleeve body comprises at least two sequentially connected unit sleeve segments in the direction from the proximal tube opening to the distal tube opening, wherein at least the unit sleeve segment located at the farthest end is a conical tube body.

8. A branch sheath, characterized in that: The branch sheath comprises: Control frame; The coated sleeve as described in any one of claims 1-7, wherein the coated sleeve is assembled on the control frame.

9. The branch sheath according to claim 8, characterized in that: The control frame comprises: A fixed catheter, the fixed catheter having a catheter lumen and a proximal catheter port and a distal catheter port communicating with the catheter lumen, the coated sleeve being mounted on the fixed catheter; A traction wire, the traction wire is passed through the inner cavity of the fixed catheter; A limiting component is located at the distal end of the fixed catheter, the distal end of the traction wire is connected to at least one of the fixed catheter and the limiting component, and the limiting component is located in the inner cavity of the coated sleeve to limit the separation of the fixed catheter from the coated sleeve.

10. The branch sheath according to claim 9, characterized in that: The control frame comprises: The adapter sleeve has a diameter that gradually increases in the direction from the proximal tube opening to the distal tube opening, the proximal end of the adapter sleeve is connected to the fixed catheter, and the coated sleeve is fixedly sleeved in the inner cavity of the adapter sleeve.

11. The branch sheath according to claim 10, characterized in that: The sleeve body comprises at least two sequentially connected unit sleeve segments in the direction from the proximal tube opening to the distal tube opening, the transition sleeve and the unit sleeve segments are both conical tube bodies, and the transition sleeve is sleeved on the unit sleeve segment located at the nearest end among the multiple unit sleeve segments.

12. A conveying system, characterized in that: The delivery system comprises: The coated casing according to any one of claims 1 to 7; or A branch sheath as described in any one of claims 8-11.

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