Conveying device

Abstract

The present application relates to a kind of delivery device, for delivering stent into blood vessel, the delivery device includes: handle unit;And sheath core assembly, the sheath core assembly includes semi-release sheath core and post-release sheath core, both slidingly connected to the shell, the operating element is configured as: by the first working position is moved to the second working position, the operating element drives the semi-release sheath core to move to the proximal side of the delivery device, to release the semi-release restraint of the stent, and the position of the post-release sheath core relative to the shell is unchanged;By the second working position continues to move to the proximal side of the delivery device, the operating element simultaneously drives the semi-release sheath core and the post-release sheath core to move to the proximal side of the delivery device, the post-release sheath core moves to the proximal side of the delivery device to release the post-release restraint of the stent.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of medical devices, in particular to a delivery device. BACKGROUND

[0002] Aortic aneurysm refers to local or diffuse abnormal expansion of aortic wall. Aortic aneurysm can compress surrounding organs and cause symptoms, and aneurysmal rupture is the main danger. Aortic aneurysm often occurs in ascending aorta, aortic arch, thoracic descending aorta, thoraco-abdominal aorta and abdominal aorta. Aortic aneurysm can be divided into true aortic aneurysm, false aortic aneurysm and dissection aortic aneurysm according to structure.

[0003] Aortic aneurysm can be treated by covered stent, and the covered stent is generally delivered to a specific site of blood vessel by a delivery device. The existing delivery device has high operation complexity and complex surgical process when delivering the covered stent. SUMMARY

[0004] Therefore, it is necessary to provide a delivery device aiming at the above technical problems.

[0005] A delivery device for delivering a stent into a blood vessel, the delivery device comprising:

[0006] a handle unit comprising a housing and an operating element connected to the housing, the operating element being movable at least in an axial direction of the housing and being movable from a first working position to a second working position in a distal-to-proximal direction of the delivery device; and

[0007] a sheath core assembly comprising a half-release sheath core and a post-release sheath core which are both slidingly connected to the housing, the operating element being configured to:

[0008] when moved from the first working position to the second working position, the operating element drives the half-release sheath core to move proximally of the delivery device to release the half-release constraint on the stent, and the position of the post-release sheath core relative to the housing remains unchanged;

[0009] when continuously moved proximally of the delivery device from the second working position, the operating element simultaneously drives the half-release sheath core and the post-release sheath core to move proximally of the delivery device, and the post-release sheath core moves proximally of the delivery device to release the post-release constraint on the stent.

[0010] The delivery device is used for delivering the stent to a specific position of a blood vessel. The handle unit is operated to control the action of the sheath core assembly, so as to deliver the stent to the specific position of the blood vessel. The sheath core assembly can control the half-release process and the post-release process of the stent. The operating element can be moved between the first working position and the second working position. When the operating element is moved from the first working position to the second working position, the half-release sheath core is driven to move to the distal side of the delivery device, so as to release the half-release restraint of the stent and realize the half-release of the stent. When the operating element is continuously moved to the distal side of the delivery device from the second working position, the post-release sheath core is driven to move to the distal side of the delivery device, so as to realize the post-release of the stent. Therefore, the half-release and the post-release of the stent can be controlled only by moving the operating element, the operation process is simple, and the complexity of the surgical operation is greatly simplified. BRIEF DESCRIPTION OF DRAWINGS

[0011] Figure 1a It is a disassembled structure diagram of a covered stent in an embodiment of the present application;

[0012] Figure 1b It is a top view of a main stent in the Figure 1a

[0013] Figure 2 It is a structure diagram of a covered stent implanted in an aortic arch of an aortic blood vessel in an embodiment of the present application;

[0014] Figure 3 It is a structure diagram of a delivery device in an embodiment of the present application;

[0015] Figure 4a It is a structure diagram of an operating element in a first working position in an embodiment of the present application;

[0016] Figure 4b It is a structure diagram of an operating element in a second working position in an embodiment of the present application;

[0017] Figure 5a It is a structure diagram of a stent in an integral restraint state in an embodiment of the present application;

[0018] Figure 5b It is a structure diagram of a stent in a half-release state in an embodiment of the present application;

[0019] Figure 5c It is a structure diagram of a stent in a post-release state in an embodiment of the present application;

[0020] Figure 6a It is a diagram of an operating element in a first working position in a delivery device in an embodiment of the present application; ​

[0021] Figure 6b Schematic view of the operating element in the delivery device of one embodiment of the application in the second working position;

[0022] Figure 6c Schematic view of the operating element in the delivery device of one embodiment of the application in the second working position proximally;

[0023] Figure 7a Schematic view of the delivery device of one embodiment of the application in the state of total restraint of the stent;

[0024] Figure 7b Schematic view of the delivery device of one embodiment of the application in the state of half release of the stent;

[0025] Figure 7c Schematic view of the delivery device of one embodiment of the application in the state of post release of the stent;

[0026] Figure 8a 、 Figure 8b and Figure 8c Schematic view of the delivery device of one embodiment of the application in the state of release of the first branch of the stent;

[0027] Figure 9 Schematic view of the structure of the pre-positioned guide wire and the housing in the delivery device of one embodiment of the application;

[0028] Figure 10 Schematic view of the structure of the locking element of the delivery device of one embodiment of the application;

[0029] Figure 11a Schematic view of the structure of the housing of the delivery device of one embodiment of the application;

[0030] Figure 11b Schematic view of the structure of the first housing of the delivery device of one embodiment of the application;

[0031] Figure 12 Schematic view of the structure of the main housing of the delivery device of one embodiment of the application;

[0032] Figure 13a and Figure 13b are Figure 9 sectional view along section A-A in

[0033] Figure 14 Schematic view of the structure of the delivery device of one embodiment of the application;

[0034] Figure 15a 、 Figure 15b and Figure 15cFig. 1, 2 and 3 are respectively first, second and third exploded schematic views of a delivery device in an embodiment of the present application.

[0035] Reference signs:

[0036] 10, stent; 10a, main body; 10b, back release binder; 10c, half release binder; 10c1, ring sleeve end; 11, main stent; 11a, first branch stent; 11a1, first port; 11b, second branch stent; 11b1, second port; 11c, third branch stent; 11d, stent main body; 11c1, third port; 11d1, first section; 11d2, middle section; 11d3, third section; 12, branch extension assembly; 12a, first branch extension stent; 12b, second branch extension stent; 12c, third branch extension stent; 20, delivery device; 100, handle unit; 110, housing; 110a, sliding slot; 110a1, half release section; 110a2, back release section; 110a3, first stop section; 110a4, second stop section; 110a5, stop wall; 111, first housing; 111a, extrusion; 111a1, second protrusion; 112, second housing; 113, main housing; 1131, first main half housing; 1132, second main half housing; 1133, guide slot; 113a, through hole; 113b, support wall; 120, operating element; 121, operating part; 122, stop part; 122a, back release sliding hole; 122b, half release sliding hole; 130, locking element; 131, first protrusion; 131a, inclined surface; 140, quick release operating assembly; 141, threaded sleeve; 142, sleeve core; 142a, first screwing part; 200, sheath unit; 210, sheath core assembly; 211, half release sheath core; 211a, half release driving part; 212, back release sheath core; 212a, back release driving part; 213, inner sheath core; 214, delivery head; 215, fixed anchor; 216, first locking element; 217, second locking element; 218, traction guide wire; 220, outer sheath; 230, pre-positioning guide wire; 240, elastic traction element. DETAILED DESCRIPTION

[0037] For the purpose of promoting an understanding of the principles of the application, reference will now be made to the embodiments illustrated in the drawings. There is shown in the drawings, several embodiments of the application. However, it should be understood that the application can be practiced in many different forms and should not be construed as limited to the embodiments set forth in the figures. Rather, these embodiments are provided so that this disclosure will be thorough and complete. It is therefore an object of the present application to provide a delivery device.

[0038] It should be noted that when an element is referred to as being "on" another element, it can be directly on the other element or intervening elements can also be present. In addition, when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements can also be present. In contrast, when an element is referred to as being "directly on" another element, there are no intervening elements present. The terms "vertical", "horizontal", "left", "right" and similar expressions as used herein are for illustrative purposes only.

[0039] As shown in FIG. 1, Figure 1a Figure 1a is a schematic diagram of an expanded structure of the covered stent 10 in an embodiment of the present application. The covered stent 10 includes a main stent 11 and a branch extension assembly 12, Figure 1b is a top view of the main stent 11 in FIG. 1. Figure 1a is a top view of the main stent 11 in FIG. 1.

[0040] Figure 2 is a schematic diagram of the covered stent 10 implanted at the aortic arch of the aortic blood vessel in an embodiment of the present application. The process of implanting the covered stent 10 in the blood vessel is that the main stent 11 is first implanted in the main blood vessel, i.e. the aortic arch, and the main stent 11 blocks the lesion x at the aortic arch, and then the branch extension assembly 12 is implanted in the branch blood vessels, i.e. the innominate artery A1, the left common carotid artery A2 and the left subclavian artery A3, and the branch extension assembly 12 is connected to the main stent 11.

[0041] As shown in FIG. 2, Figure 1a The main stent 11 includes a stent body 11d and a first branch stent 11a, a second branch stent 11b and a third branch stent 11c arranged on the stent body 11d. The first branch stent 11a protrudes outwardly from the stent body 11d, and the second branch stent 11b and the third branch stent 11c are embedded in the stent body 11d; that is, the first branch stent 11a is an outer branch stent, and the second branch stent 11b and the third branch stent 11c are inner branch stents.

[0042] The branch extension assembly 12 includes a first branch extension stent 12a, a second branch extension stent 12b and a third branch extension stent 12c. After the main stent 11 is implanted in the blood vessel, the first branch extension stent 12a is implanted in one of the branch blood vessels and connected to the main stent 11, the second branch extension stent 12b is implanted in another branch blood vessel and connected to the main stent 11, and the third branch extension stent 12c is implanted in the third branch blood vessel and connected to the main stent 11. The implantation sequence of the first branch extension stent 12a, the second branch extension stent 12b and the third branch extension stent 12c is not limited. ​

[0043] As shown in Figure 1a and Figure 1b , the first branch stent 11a protrudes out of the stent body 11d, and the first branch stent 11a has a first opening 11a1 at an end of the first branch stent 11a axially away from the stent body 11d, and the first branch extension stent 12a is connected to the first branch stent 11a through the first opening 11a1. It is allowed that the first branch stent 11a has a portion embedded in the stent body 11d, only the length of the protruding portion of the first branch stent 11a is greater than the length of the embedded portion. The first branch extension stent 12a is connected to the first branch stent 11a, specifically to the protruding portion thereof. In other embodiments, the first branch stent 11a is not limited to also extend into the stent body 11d.

[0044] As shown in Figure 1a and Figure 1b , the second branch stent 11b is embedded in the stent body 11d, and the second branch stent 11b has a second opening 11b1 at an end of the second branch stent 11b axially connected to the stent body 11d, and the second branch extension stent 12b is connected to the second branch stent 11b through the second opening 11b1. It is allowed that the second branch stent 11b has a portion protruding out of the stent body 11d, only the length of the embedded portion of the second branch stent 11b is greater than the length of the protruding portion; the second branch extension stent 12b is connected to the second branch stent 11b, specifically one end of the second branch extension stent 12b extends into the second branch stent 11b and into the embedded portion thereof.

[0045] As shown in Figure 1a and Figure 1b , the third branch stent 11c is embedded in the stent body 11d, and the third branch stent 11c has a third opening 11c1 at an end of the third branch stent 11c axially connected to the stent body 11d, and the third branch extension stent 12c is connected to the third branch stent 11c through the third opening 11c1. It is allowed that the third branch stent 11c has a portion protruding out of the stent body 11d, only the length of the embedded portion of the third branch stent 11c is greater than the length of the protruding portion, and the third branch extension stent 12c is connected to the third branch stent 11c, specifically one end of the third branch extension stent 12c extends into the third branch stent 11c and into the embedded portion thereof.

[0046] As shown in Figure 2As shown, the covered stent 10 is implanted in the aortic arch, which has three branch vessels: the brachiocephalic artery A1, the left common carotid artery A2, and the left subclavian artery A3. When the covered stent 10 is implanted in the aortic arch, the first branch stent 11a corresponds to the brachiocephalic artery A1, the second branch stent 11b corresponds to the left common carotid artery A2, and the third branch stent 11c corresponds to the left subclavian artery A3. The main stent 11 is a tubular structure, and its cross-section perpendicular to the midline can be circular, elliptical, or other shapes.

[0047] like Figure 1a As shown in this application, the covered stent 10 has a head end and a tail end at its two ends along the central axis. When the covered stent 10 is implanted into the blood vessel, the head end is closer to the heart and the tail end is farther away from the heart along the central axis. The main stent 11 includes a first segment 11d1, a middle segment 11d2, and a third segment 11d3 connected sequentially along the central axis. The radial dimension of the middle segment 11d2 is smaller than the radial dimensions of the first segment 11d1 and the third segment 11d3, thereby... Figure 1a In the stent, the middle segment 11d2 is radially concave relative to the first segment 11d1 and the third segment 11d3. This concave portion corresponds to the branched vessels of the aortic arch. Since the main stent 11 is implanted first at the aortic arch, and the positions of the brachiocephalic artery A1, left common carotid artery A2, and left subclavian artery A3 may differ in different individuals, it is difficult to precisely align the first port 11a1, the second port 11b1, and the third port 11c1 on the main stent 11 with the brachiocephalic artery A1, the left common carotid artery A2, and the left subclavian artery A3, respectively. By setting the aforementioned concave portion, a gap is created between the outer wall of the middle segment 11d2 and the inner wall of the vessel at the concave portion. This gap provides operating space, so that when one end of the second branch extension stent 12b extends from the left common carotid artery A2, its position or orientation can be adjusted at the aforementioned gap, making it easier for the second branch extension stent 12b to extend into the second port 11b1. Similarly, after one end of the third branch stent 11c extends from the left subclavian artery A3, its position or posture can be adjusted at the aforementioned gap to allow the third branch extension stent 12c to easily extend into the third opening 11c1.

[0048] When the aforementioned covered stent 10 is implanted into a blood vessel, it can be achieved through the following steps:

[0049] 1. First, slowly release the first segment 11d1 at the head end of the covered stent 10;

[0050] 2. Continue to slowly release a portion of the intermediate segment 11d2. A pre-embedded guide wire 230 is embedded in the first branch stent 11a. After the pre-embedded guide wire 230 in the first branch stent 11a is released, use a grabber or other instruments to grab the pre-embedded guide wire 230 into the brachiocephalic artery A1 and send the first branch stent 11a into the brachiocephalic artery A1.

[0051] 3. Quickly release the remaining portion of the middle segment 11d2 and the third segment 11d3, and complete the partial and final release of the covered stent 10;

[0052] 4. Using guidewire and catheter exchange techniques, the three branch vessels of the brachiocephalic artery A1, the left common carotid artery A2, and the left subclavian artery A3 are reconstructed sequentially. The corresponding first branch extension stent 12a is released into the brachiocephalic artery A1 and connected to the first branch stent 11a. The second branch extension stent 12b is released into the left common carotid artery A2 and connected to the second branch stent 11b. The third branch extension stent 12c is released into the left subclavian artery A3 and connected to the third branch stent 11c.

[0053] An embodiment of this application also provides a delivery device 20 for delivering the above-mentioned covered stent 10 into a blood vessel. Of course, the delivery device 20 is not limited to delivering the above-mentioned covered stent 10, but can also deliver other types of stents into blood vessels. Other types of stents can be bare stents without coverings, for example.

[0054] like Figure 3 As shown, Figure 3 This is a schematic diagram of the delivery device 20 in one embodiment of this application. The delivery device 20 includes a handle unit 100 and a sheath unit 200. The handle unit 100 is used for gripping and operating actions. The sheath unit 200 is connected to the handle unit 100 and is used to accommodate the delivered stent, such as a covered stent 10, and to perform various actions of the handle unit 100. For example, after the elongated sheath unit 200 is inserted into a blood vessel, the sheath unit 200 can be moved forward or backward, or bent to pass through a curved blood vessel, etc., by operating the handle unit 100. It should be noted that, for ease of description, as... Figure 3 As shown, "distal side" and "proximal side" are defined. When the conveying device 20 is operated, the end closer to the operator is the "proximal side," and the end farther from the operator is the "distal side." More intuitively, in... Figure 3 In the diagram, the side closer to the bottom is the "proximal side," and the side closer to the top is the "distal side."

[0055] like Figure 3As shown, as a whole, the sheath unit 200 comprises a sheath core assembly 210 and an outer sheath 220, the outer sheath 220 is sleeved outside the sheath core assembly 210, and the sheath core assembly 210 and the outer sheath 220 are both flexible and elongated structures. Specifically, the outer sheath 220 is an elongated tube, the proximal side of the outer sheath 220 is connected to the handle unit 100, and the distal side is a free end. The covered stent 10 is accommodated in the distal side of the outer sheath 220, and the covered stent 10 can be released from the distal side opening of the outer sheath 220 by operating the handle unit 100. The sheath core assembly 210 is at least partially sleeved in the outer sheath 220, and the proximal side of the sheath core assembly 210 is connected to the handle unit 100, and the distal side of the sheath core assembly 210 can extend out of the outer sheath 220.

[0056] The handle unit 100 comprises a housing 110 and an operating element 120 connected to the housing 110. The housing 110 functions as a container for accommodating or attaching components that perform specific functions. For example, in Figure 3 , the operating element 120 can at least move along the axial direction of the housing 110. The structure for achieving this movement can be, for example, that the operating element 120 is a sleeve structure that is sleeved outside the housing 110, so that it can slide along the axial direction of the housing 110. For another example, the operating element 120 can be a protrusion, and a sliding groove 110a (as shown in Figure 6a ) extending along the axial direction can be formed on the side wall of the housing 110, so that the operating element 120 as a protrusion is slidingly connected in the sliding groove 110a, so that the operating element 120 can also slide along the axial direction of the housing 110. The operating element 120 can be connected to the sheath core assembly 210, so that when the operating element 120 slides along the axial direction of the housing 110, the sheath core assembly 210 can also slide along the axial direction of the housing 110.

[0057] Since the operating element 120 can slide along the axial direction of the housing 110, a first working position and a second working position are defined on the sliding track, wherein the first working position is closer to the distal side of the housing 110 than the second working position. More intuitively, in Figure 3 , the first working position is located above the second working position. That is, in the direction from the distal side to the proximal side of the delivery device 20, the operating element 120 can be moved from the first working position to the second working position.

[0058] As shown in Figure 4a and Figure 4b , Figure 4a shows a structure schematic view of the operating element 120 in the first working position in an embodiment of the present application, Figure 4b shows a structure schematic view of the operating element 120 in the second working position in an embodiment of the present application.

[0059] As shown in Figure 4a andFigure 4b As shown, the sheath core assembly 210 includes a half-release sheath core 211 and a rear-release sheath core 212, both of which are accommodated in the housing 110 and can slide in the housing 110.

[0060] The operating element 120 is configured to, when moving from the first working position to the second working position, i.e. when the operating element 120 is moved from Figure 4a the first working position along the axial direction of the housing 110 to the proximal side of the housing 110, drive the half-release sheath core 211 to move to the proximal side of the delivery device 20. Figure 4b As shown, when the operating element 120 is in the second working position, the operating element 120 drives the half-release sheath core 211 to move to the proximal side of the delivery device 20, and at the same time, the rear-release sheath core 212 is driven to move to the proximal side of the delivery device 20. Specifically, the rear-release sheath core 212 can be fixedly connected to the operating element 120, so that when the operating element 120 is moved from the first working position to the second working position along the axial direction of the housing 110, the operating element 120 can drive the half-release sheath core 211 to move to the proximal side of the delivery device 20.

[0061] The operating element 120 is further configured to, when continuing to move to the proximal side of the delivery device 20 from the second working position, i.e. when the operating element 120 is moved from Figure 4b the second working position along the axial direction of the housing 110 to the proximal side of the housing 110, more intuitively, is moved from Figure 4b the second working position along the axial direction of the housing 110 to the proximal side of the housing 110, the operating element 120 drives the half-release sheath core 211 and the rear-release sheath core 212 to move to the proximal side of the delivery device 20. Specifically, a rear-release driving portion 212a can be fixedly arranged on the proximal side of the rear-release sheath core 212, as shown in Figure 4a when the operating element 120 is in the first working position, the rear-release driving portion 212a is spaced apart from the operating element 120 in the axial direction of the housing 110, as shown in Figure 4b when the operating element 120 is moved to the second working position, the rear-release driving portion 212a is in abutting connection with the operating element 120, so that when the operating element 120 continues to move to the proximal side from Figure 4b the second working position, the operating element 120 can drive the rear-release sheath core 212 and the half-release sheath core 211 to move to the proximal side of the housing 110 together.

[0062] The distal end of the half-releasing sheath core 211 and the distal end of the post-releasing sheath core 212 both extend distally beyond the outer sheath tube 220. The half-releasing sheath core 211 is used to control the half-releasing process of the stent. When the half-releasing sheath core 211 moves proximally, the half-releasing process of the stent is released, so that the stent is released from the whole restraint state to the half-releasing state through the half-releasing process. The post-releasing sheath core 212 is used to control the post-releasing process of the stent. When the post-releasing sheath core 212 moves proximally, the post-releasing process of the stent is released, so that the stent is released from the half-releasing state to the post-releasing state through the post-releasing process.

[0063] The half-releasing state and the post-releasing state are described in detail below. Figure 5a The structure diagram of the stent in the whole restraint state in an embodiment of the present application is shown in Figure 5b The structure diagram of the stent in the half-releasing state in an embodiment of the present application is shown in Figure 5c The structure diagram of the stent in the post-releasing state in an embodiment of the present application is shown in.

[0064] The stent can be a covered stent 10 or a bare stent. Taking the covered stent 10 as an example, the covered stent 10 includes a main body part 10a made of a bare stent, and a covering film arranged on the main body part 10a. The bare stent extends from the head end of the covering film to form a post-releasing restraint member 10b. The post-releasing restraint member 10b is annular. There can be three post-releasing restraint members 10b. The distal end of the post-releasing sheath core 212 is sequentially inserted into the three annular post-releasing restraint members 10b and radially compresses and binds the three annular post-releasing restraint members 10b. Of course, in other embodiments, other binding parts can be installed at the distal end of the post-releasing sheath core 212 to radially compress and bind the three post-releasing restraint members 10b. The covered stent 10 further includes a half-releasing restraint member 10c bound to the outer periphery of the main body part 10a. The half-releasing restraint member 10c is bound to the outer periphery of the main body part 10a through a quick-release knotting process. The half-releasing restraint member 10c extends out of an annular sleeve end 10c1. The half-releasing sheath core 211 is arranged in the annular sleeve end 10c1 and can keep the half-releasing restraint member 10c bound to the outer periphery of the main body part 10a to radially compress the main body part 10a. When the half-releasing sheath core 211 is pulled out of the annular sleeve end 10c1, the half-releasing restraint member 10c bound by the knotting process can be quickly released. Under the action of the elastic force of the main body part 10a, the main body part 10a expands radially to the Figure 5b The half-releasing state is shown. When the post-releasing sheath core 212 is pulled out of the post-releasing restraint member 10b, the head end of the covered stent 10 expands radially to the Figure 5cThe rear release state is shown. When the operating element 120 drives the half release sheath core 211 to move proximally to the delivery device 20, the half release restraint on the stent can be released; when the operating element 120 continues to move proximally to the delivery device 20 from the second working position, the operating element 120 drives the half release sheath core 211 and the rear release sheath core 212 to move proximally to the delivery device 20 at the same time, and the rear release sheath core 212 moves proximally to the delivery device 20 to release the rear release restraint on the stent.

[0065] The delivery device 20 in the above embodiment can realize half release control and rear release control on the stent by only operating the operating element 120, the operation process is simple, and the complexity of the surgical operation is greatly simplified.

[0066] Figure 6a FIG. 1 shows a schematic view of the operating element 120 in the delivery device 20 in an embodiment of the present application when the operating element 120 is located in the first working position. The shell 110 is provided with a sliding groove 110a, and the operating element 120 is slidingly connected to the sliding groove 110a. Specifically, the operating element 120 is at least partially located in the shell 110, and at least another part extends out of the shell 110 through the sliding groove 110a.

[0067] As shown in FIGS. 1 and 2, the part of the operating element 120 located in the shell 110 is connected to the half release sheath core 211 and the rear release sheath core 212. Figure 4a and Figure 4b As shown in FIGS. 1 and 2, the part of the operating element 120 located in the shell 110 is connected to the half release sheath core 211 and the rear release sheath core 212. Figure 4a and Figure 4b As shown in FIGS. 1 and 2, the part of the operating element 120 located in the shell 110 is connected to the half release sheath core 211 and the rear release sheath core 212.

[0068] In other embodiments, the part of the operating element 120 located outside the shell 110 can also not be a sleeve structure, for example, can be a protruding block structure. By providing the sliding groove 110a on the shell 110, the sliding groove 110a guides the sliding of the operating element 120, so that the operating element 120 slides in the extension direction of the sliding groove 110a, and the stability of the sliding of the operating element 120 is improved. The part of the operating element 120 extending into the shell 110 is connected to the half release sheath core 211 and the rear release sheath core 212, and can drive the half release sheath core 211 and the rear release sheath core 212 to move proximally to the shell 110.

[0069] The special structure enables the operation element 120 to first drive the half-releasing sheath core 211 to slide and then drive the half-releasing sheath core 211 and the rear-releasing sheath core 212 to move synchronously when the operation element 120 slides along the sliding groove 110a from the distal side to the proximal side. For example, the half-releasing sheath core 211 can be fixedly connected to the operation element 120, and the connection between the operation element 120 and the rear-releasing sheath core 212 can be sliding connection first, and when the operation element 120 moves to the second working position, the connection between the operation element 120 and the rear-releasing sheath core 212 changes to axial abutting connection. Of course, the half-releasing sheath core 211 can be slidingly connected to the operation element 120 when the operation element 120 is located at the distal side of the first releasing position, and when the operation element 120 moves to the proximal side of the first releasing position, the connection between the half-releasing sheath core 211 and the operation element 120 changes from axial sliding connection to axial abutting connection.

[0070] Specifically, as shown in Figure 4a and Figure 4b , the operation element 120 comprises an operation part 121 and a stop part 122 connected to the operation part 121. The operation part 121 can be a sleeve structure or a protrusion structure, and in the embodiment, the sleeve structure is taken as an example for description, that is, the operation part 121 is sleeved on the outer periphery of the housing 110, the stop part 122 extends into the housing 110, and the stop part 122 is also slidingly connected to the sliding groove 110a on the housing 110. The stop part 122 is provided with a rear-releasing sliding hole 122a arranged in the axial direction, and the rear-releasing sheath core 212 slidingly passes through the rear-releasing sliding hole 122a. The rear-releasing sheath core 212 is provided with a rear-releasing driving part 212a, as shown in Figure 4b , when the operation element 120 is located at the second working position, the stop part 122 abuts against the rear-releasing driving part 212a, and when the operation element 120 continues to move to the proximal side of the housing 110 from the second working position, the stop part 122 keeps abutting against the rear-releasing driving part 212a, so that the stop part 122 drags the rear-releasing driving part 212a to move to the proximal side of the housing 110, thereby enabling the rear-releasing sheath core 212 to move to the proximal side of the housing 110. As shown in Figure 4a , when the operation element 120 is located at the first working position, the stop part 122 is spaced apart from the rear-releasing driving part 212a, that is, in a separated state, and when the operation element 120 slides to the distal side of the second working position, the stop part 122 and the rear-releasing driving part 212a are both in a spaced-apart state, at this time, when the operation element 120 slides, the rear-releasing sheath core 212 slides relative to the rear-releasing sliding hole 122a of the stop part 122, and at this time, the position of the rear-releasing sheath core 212 relative to the housing 110 is unchanged.

[0071] In one embodiment, the stop portion 122 can be fixedly connected to the semi-release sheath core 211, so as long as the stop portion 122 slides from the distal side to the proximal side, the semi-release sheath core 211 can be dragged to slide to the proximal side.

[0072] like Figure 4a As shown, in another embodiment, the stop portion 122 has an axially extending semi-release sliding hole 122b, and the semi-release sheath core 211 slides through the semi-release sliding hole 122b. The semi-release sheath core 211 has a semi-release driving portion 211a. When the operating element 120 is in the first working position, the stop portion 122 abuts against the semi-release driving portion 211a. When the operating element 120 continues to move from the first working position to the second working position, the stop portion 122 and the semi-release driving portion 211a remain in axial contact, and the stop portion 122 can drag the semi-release driving portion 211a to move towards the proximal side of the housing 110, thereby causing the semi-release sheath core 211 to move towards the proximal side of the housing 110. Of course, when the operating element 120 slides to the distal side of the first working position, the semi-release sheath core 211 is slidably connected to the semi-release sliding hole 122b.

[0073] like Figure 4a As shown, both the rear release drive unit 212a and the semi-release drive unit 211a are block structures, which prevent them from passing through the rear release sliding hole 122a and the semi-release sliding hole 122b, respectively.

[0074] In other embodiments, the rear release drive portion 212a can be formed by bending the rear release sheath core 212, and the semi-release drive portion 211a can also be formed by bending the semi-release sheath core 211. Taking the rear release drive portion 212a as an example, after the rear release sheath core 212 passes through the rear release sliding hole 122a of the stop portion 122, the rear release sheath core 212 is laterally bent by 90° to form a rear release drive portion 212a that is approximately perpendicular to the axial direction. Of course, the rear release drive portion 212a can also have other structures, as long as the rear release drive portion 212a cannot pass through the rear release sliding hole 122a when it abuts against the stop portion 122.

[0075] Figure 6b This is a schematic diagram of the operating element 120 in the conveying device 20 of one embodiment of the application when it is in the second working position. Figure 6c A schematic diagram of the operating element 120 in the conveying device 20 of one embodiment of the application, located near the second working position.

[0076] like Figure 6cAs shown, the slide 110a comprises a half-release section 110a1 and a post-release section 110a2, wherein the second working position is located between the half-release section 110a1 and the post-release section 110a2, i.e. the position where the half-release section 110a1 and the post-release section 110a2 are connected, and the first working position is located distally to the half-release section 110a1. The operating element 120 can be moved along the half-release section 110a1 from the first working position to the second working position, and the operating element 120 can be moved along the post-release section 110a2 from the second working position to the proximal side of the delivery device 20.

[0077] In one embodiment, the extension directions of the half-release section 110a1 and the post-release section 110a2 can be collinear, i.e. their extension directions are on the same straight line, which can be along the axial direction of the housing 110, can be inclined to the axial direction, but cannot be perpendicular to the axial direction.

[0078] In one embodiment, the slide can also be a curved slide, i.e. the extension directions of the half-release section 110a1 and the post-release section 110a2 are on a curve.

[0079] In one embodiment, the half-release section 110a1 and the post-release section 110a2 can be directly connected at their ends, or can be spaced apart by other slot structures therebetween.

[0080] In one embodiment, the included angle between the extension directions of the half-release section 110a1 and the post-release section 110a2 can be an acute angle or an obtuse angle.

[0081] In Figure 6a , Figure 6b and Figure 6cIn the embodiment, the slide groove is a bent slide groove 110a. The extending directions of the half-releasing section 110a1 and the rear-releasing section 110a2 are parallel, but the half-releasing section 110a1 and the rear-releasing section 110a2 are circumferentially staggered. Specifically, the slide groove 110a includes a first stop section 110a3 and a second stop section 110a4, the first stop section 110a3, the half-releasing section 110a1, the second stop section 110a4, and the rear-releasing section 110a2 are sequentially connected, and the first stop section 110a3 and the second stop section 110a4 respectively include a stop wall 110a5 for limiting the axial movement of the operating element 120 along the delivery device 20. For example, the extending directions of the first stop section 110a3 and the second stop section 110a4 can be perpendicular to the axial direction of the housing 110. The stop wall 110a5 can also be perpendicular to the axial direction of the housing 110. In this way, when the operating element 120 is located in the first stop section 110a3, the operating element 120 cannot slide along the axial direction of the housing 110 due to the limiting of the stop wall 110a5 of the first stop section 110a3. The operating element 120 can be first slid along the extending direction of the first stop section 110a3, i.e., along the circumferential direction of the housing 110, and then slid along the axial direction of the housing 110 to the half-releasing section 110a1 when it reaches the position corresponding to the half-releasing section 110a1. When the operating element 120 is in the first stop section 110a3, the operating element 120 is in the first working position. When the operating element 120 is slid to the second stop section 110a4, the operating element 120 is in the second working position. In the second working position, the operating element 120 can be first slid along the extending direction of the second stop section 110a4, i.e., along the circumferential direction of the housing 110, and then slid along the axial direction of the housing 110 to the rear-releasing section 110a2 when it reaches the position corresponding to the rear-releasing section 110a2.

[0082] Figure 7a A schematic view of the delivery device 20 restraining the stent as a whole in an embodiment of the present application, Figure 7b A schematic view of the delivery device 20 releasing the stent in an embodiment of the present application. Figure 7c A schematic view of the delivery device 20 releasing the stent in an embodiment of the present application.

[0083] As Figure 7a and Figure 7b shown, the sheath core assembly 210 includes an inner sheath core 213 and a delivery head 214, the inner sheath core 213 is arranged in the housing 110 at the proximal side and exposed from the housing 110 at the distal side, and the delivery head 214 is connected to the distal side of the inner sheath core 213.

[0084] The sheath core assembly 210 also includes a first locking member 216, which is disposed at a position where the inner sheath core 213 is located outside the housing 110. The first locking member 216 can be fixedly connected to the inner sheath core 213 or movably connected to the inner sheath core 213. A fixed connection here means that the first locking member 216 is connected to the inner sheath core 213 and cannot move relative to the inner sheath core 213; while a movable connection means that the first locking member 216 can be sleeved on the outside of the inner sheath core 213, and its position relative to the inner sheath core 213 remains unchanged through friction, but during assembly, the first locking member 216 can still be pushed to position it at different positions within the inner sheath core 213.

[0085] The semi-release sheath core 211 is detachably connected to the first locking member 216. For example, the distal end of the semi-release sheath core 211 can be inserted into the first locking member 216, or into the gap formed between the first locking member 216 and the inner sheath core 213. Furthermore, the distal end of the semi-release sheath core 211 can also be pulled out from the first locking member 216, or from the gap between the first locking member 216 and the inner sheath core 213. Figure 7a As shown, the semi-release sheath core 211 is first inserted into the annular sleeve end 10c1 of the membrane-covered support 10. It should be noted that... Figure 7a , Figure 7b and Figure 7c Only the annular sleeve end 10c1 and the rear release restraint 10b of the covered stent 10 are shown in the diagram. For the detailed structure, please refer to [link to diagram]. Figure 5a See also Figure 7a The semi-release sheath core 211 is then inserted into the gap formed by the first locking member 216 and the inner sheath core 213, thereby connecting the semi-release sheath core 211 to the first locking member 216. Since the annular sleeve end 10c1 of the covered stent 10 is radially restrained by the semi-release sheath core 211, the proximal end of the covered stent 10 is in a radially compressed state. Therefore, when the semi-release sheath core 211 is connected to the first locking member 216, the first locking member 216 serves to restrict the semi-release sheath core 211 from radially moving away from the inner sheath core 213, and to control the semi-release process of the stent through the semi-release sheath core 211 near the first locking member 216. Figure 7b As shown, the distal end of the semi-release sheath core 211 can also be pulled out from the gap formed by the first locking member 216 and the inner sheath core 213. At this time, the semi-release sheath core 211 is separated from the annular sleeve end 10c1, that is, the semi-release sheath core 211 no longer binds the semi-release sheath core 211 at the proximal end of the covered stent 10, and the covered stent 10 can expand radially under its own elasticity.

[0086] like Figure 7aAs shown, the sheath core assembly 210 further comprises a fixing anchor 215 fixedly connected to the rear release sheath core 212, the fixing anchor 215 slidingly sleeved outside the inner sheath core 213. The fixing anchor 215 has three clamping claws, the free end of the clamping claws facing the distal end, and after the clamping claws of the fixing anchor 215 hook the rear release restraint member 10b of the stent graft 10, the clamping claws of the fixing anchor 215 abut against the delivery head 214, preventing the rear release restraint member 10b of the stent graft 10 from disengaging from the clamping claws of the fixing anchor 215. Since the fixing anchor 215 is fixedly connected to the rear release sheath core 212, the proximal movement of the rear release sheath core 212 can drive the fixing anchor 215 to move proximally along the inner sheath core 213, so that the distal end of the clamping claws of the fixing anchor 215 disengages from the abutment with the delivery head 214, as shown in Figure 7c At this time, the rear release restraint member 10b of the stent graft 10 disengages from the clamping claws of the fixing anchor 215, that is, the clamping claws of the fixing anchor 215 no longer radially restrain the rear release restraint member 10b of the stent graft 10, and the stent graft 10 can expand radially under its own elasticity to achieve the rear release process of the stent graft 10. Therefore, the fixing anchor 215 can slide along the inner sheath core 213 under the drive of the rear release sheath core 212 to control the rear release process of the stent.

[0087] As shown in Figure 7a The sheath core assembly 210 further comprises a second locking member 217 provided on the inner sheath core 213 outside the housing 110, which can have the same shape as the first locking member 216, except that the second locking member 217 is located proximally of the first locking member 216. The semi-release sheath core 211 is movably arranged between the second locking member 217 and the inner sheath core 213, and the second locking member 217 radially restrains the semi-release sheath core 211 to make the semi-release sheath core 211 closely adhere to the inner sheath core 213. After the semi-release sheath core 211 passes through the second locking member 217, it passes through the annular sleeve end 10c1, and then passes through the first locking member 216. The axial positioning of the annular sleeve end 10c1 by the first locking member 216 and the second locking member 217 positions the proximal end of the stent graft 10. In other embodiments, the semi-release sheath core 211 and the rear release sheath core 212 are movably connected to the second locking member 217, and the second locking member 217 is used to limit the semi-release sheath core 211 and the rear release sheath core 212 from moving radially away from the inner sheath core 213.

[0088] In one embodiment, the first locking member 216 and the second locking member 217 are both sleeve-shaped and are sleeved outside the inner sheath core 213. For example, the first locking member 216 and the second locking member 217 can be elastic rubber tubes that are elastically sleeved outside the inner sheath core 213. The first locking member 216 and the second locking member 217 can also be non-elastic plastic sleeves or metal sleeves. The first locking member 216 and the second locking member 217 can also be block-shaped structures.

[0089] As shown in Figure 1a , the first branch stent 11a is at least partially convex to the stent body 11d, thus the first branch stent 11a is an outer branch stent. The covered stent 10 is released by the delivery device 20 at the aortic arch, when delivering, the covered stent 10 is compressed in the delivery device 20, and when delivering, the first branch stent 11a is embedded in the stent body 11d, in the process of releasing, the first branch stent 11a is changed from the embedded state to the convex state, and extends into the innominate artery A1.

[0090] Figure 8a , Figure 8b and Figure 8c is the working principle diagram of the first branch stent 11a released by the delivery device 20 in an embodiment of the present application.

[0091] As shown in Figure 8a , Figure 8b and Figure 8c , the delivery device 20 includes a preset guide wire 230 and an elastic traction member 240. The preset guide wire 230 is a soft and long guide wire, one end of which is connected to the housing 110, and the preset guide wire 230 is arranged in the outer branch stent of the covered stent 10, i.e. the first branch stent 11a. The elastic traction member 240 is fixedly connected to the preset guide wire 230, and the elastic traction member 240 can be a tapered elastic rubber tube, in the natural state, the maximum radial dimension of the large cross section of the tapered elastic rubber tube is greater than the radial dimension of the inner cavity of the first branch stent 11a, and the tapered tip penetrates the inner cavity of the first branch stent 11a and leaks out. As shown in Figure 8a and Figure 8b , when the preset guide wire 230 is pulled upwards, the elastic traction member 240 can be pulled, thereby driving the first branch stent 11a inside the covered stent 10 to extend out of the covered stent 10 (as shown in Figure 8b ), and the preset guide wire 230 is continuously pulled upwards, as shown in Figure 8c , since the elastic traction member 240 is elastic, it can be elastically compressed to be separated from the inner cavity of the first branch stent 11a, in the process of pulling the preset guide wire 230, the first branch stent 11a is pulled into the innominate artery A1, thereby enabling the first branch stent 11a, i.e. the outer branch stent, to be smoothly released in the innominate artery A1. For example, a snare is released from the carotid artery to capture the preset guide wire 230, and then the snare is pulled to drive the preset guide wire 230 to move in the blood vessel. Referring to Figure 8a continuously, the delivery device 20 further includes a traction guide wire 218, the traction guide wire 218 is different from the preset guide wire 230 in that the traction guide wire 218 penetrates the delivery head 214 and the distal end thereof extends out of the delivery head 214; while the preset guide wire 230 penetrates the first branch stent 11a and the distal end thereof extends out of the first branch stent 11a.

[0092] like Figure 9 As shown, Figure 9 This is a schematic diagram showing the connection between the pre-placed guide wire 230 and the housing 110 in a conveying device 20 according to one embodiment of this application. The proximal end of the pre-placed guide wire 230 is connected to the housing 110. The housing 110 includes a main housing 113 and a first outer housing 111 fixedly sleeved outside the main housing 113. An operating element 120 is movably connected to the main housing 113 and can slide along the axial direction of the main housing 113. A groove 110a is also provided on the main housing 113. A through hole 113a for the pre-placed guide wire 230 to pass through is also provided on the side wall of the main housing 113. Figure 12 The pre-placed guide wire 230 is inserted into the main housing 113, and the proximal end of the pre-placed guide wire 230 extends out of the main housing 113 through the through hole 113a.

[0093] The handle unit 100 also includes a locking member 130 rotatably sleeved on the first housing 111, the locking member 130 being able to rotate around... Figure 9 The locking member 130 is configured to cooperate with the housing 110 in the first state to lock the pre-placed guide wire 230 to the housing 110, thus fixing the pre-placed guide wire 230 to the housing 110. The locking member 130 changes from the first state to the second state by rotating relative to the first housing 111 in the direction of the arrow shown in the figure. In the second state, the locking member 130 and the housing 110 no longer lock the pre-placed guide wire 230, and the pre-placed guide wire 230 can slide relative to the housing 110. In specific operation, during the delivery of the film-coated support 10, the proximal end of the pre-placed guide wire 230 is first locked to the housing 110 and then captured by the grabber. Figure 8a When the pre-set guide wire 230 is at its distal end, it allows the pre-set guide wire 230 to slide relative to the housing 110. At this time, dragging the capture device will allow the pre-set guide wire 230 to slide.

[0094] Figure 10 This is a schematic diagram of the locking member 130 of the conveying device 20 in one embodiment of this application. Figure 10 As shown, the locking member 130 can be a tubular structure with an inner cavity, and the main housing 113 passes through the inner cavity of the locking member 130. The locking member 130 is provided with a first protrusion 131 on the inner cavity side. The locking member 130 is configured such that, in a first state, the first protrusion 131 and the main housing 113 jointly compress the pre-placed guide wire 230 to fix the pre-placed guide wire 230 to the housing 110, and in a second state, the first protrusion 131 and the main housing 113 release the compression of the pre-placed guide wire 230.

[0095] In another embodiment, the locking member 130 is configured such that, in a first state, the first protrusion 131 first presses the first outer shell 111 to cause the first outer shell 111 to elastically deform toward the main shell 113, thereby clamping the pre-placed guide wire 230 between the first outer shell 111 and the main shell 113 to fix the pre-placed guide wire 230 to the housing 110; in a second state, the first protrusion 131 releases the pressure on the first outer shell 111, and the first outer shell 111 elastically resets to move radially away from the outer surface of the main shell 113, thereby preventing the first outer shell 111 and the main shell 113 from pressing the pre-placed guide wire 230.

[0096] Figure 11a This is a partial structural diagram of the housing 110 of the conveying device 20 in one embodiment of this application. Figure 11b This is a schematic diagram of the structure of the first housing 111 of the conveying device 20 in one embodiment of this application. Figure 12 This is a schematic diagram of the main housing 113 of the conveying device 20 in one embodiment of this application.

[0097] Specifically, such as Figure 11a , Figure 11b and Figure 12 As shown, a pressing member 111a is elastically connected to the first outer shell 111. The pressing member 111a is elongated and can have two axially extending slits spaced circumferentially on the shell wall of the first outer shell 111, forming the pressing member 111a between the two slits. The first outer shell 111 is fitted onto the main shell 113, and the main shell 113 has a support wall 113b corresponding to the pressing member 111a in the radial direction. Figure 12 Thus, when the extruder 111a is extruded, it can jointly extrude the pre-placed guide wire 230 with the support wall 113b. The locking member 130 is configured such that, in a first state, the first protrusion 131 corresponds to the extruder 111a radially in the housing, pushing the extruder 111a closer to the support wall 113b to clamp the pre-placed guide wire 230 located between the extruder 111a and the support wall 113b; in a second state, the first protrusion 131 is offset from the extruder 111a, and the extruder 111a elastically moves radially away from the support wall 113b relative to the first housing 111.

[0098] like Figure 11bAs shown, the extruding member 111a is provided with a second protrusion 111a1 for extruding cooperation with the first protrusion 131 in the first state, and the first protrusion 131 and / or the second protrusion 111a1 is provided with an inclined surface 131a for guiding. For example, the first protrusion 131 is provided with the inclined surface 131a while the second protrusion 111a1 is not provided with the inclined surface 131a; or for example, the first protrusion 131 is not provided with the inclined surface 131a while the second protrusion 111a1 is provided with the inclined surface 131a; or for example, both the first protrusion 131 and the second protrusion 111a1 are provided with the inclined surface 131a. When rotating the locking member 130 along the direction of the arrow shown, when the first protrusion 131 and the second protrusion 111a1 contact, the inclined surfaces 131a of the two protrusions contact, and when further rotating the locking member 130, the first protrusion 131 pushes the second protrusion 111a1 along the radial direction through the contact of the two protrusions. Figure 9 When rotating the locking member 130 along the direction of the arrow shown, when the first protrusion 131 and the second protrusion 111a1 contact, the inclined surfaces 131a of the two protrusions contact, and when further rotating the locking member 130, the first protrusion 131 pushes the second protrusion 111a1 along the radial direction through the contact of the two protrusions.

[0099] Figure 13a and Figure 13b As shown, the extruding member 111a is provided with a second protrusion 111a1 for extruding cooperation with the first protrusion 131 in the first state, and the first protrusion 131 and / or the second protrusion 111a1 is provided with an inclined surface 131a for guiding. For example, the first protrusion 131 is provided with the inclined surface 131a while the second protrusion 111a1 is not provided with the inclined surface 131a; or for example, the first protrusion 131 is not provided with the inclined surface 131a while the second protrusion 111a1 is provided with the inclined surface 131a; or for example, both the first protrusion 131 and the second protrusion 111a1 are provided with the inclined surface 131a. When rotating the locking member 130 along the direction of the arrow shown, when the first protrusion 131 and the second protrusion 111a1 contact, the inclined surfaces 131a of the two protrusions contact, and when further rotating the locking member 130, the first protrusion 131 pushes the second protrusion 111a1 along the radial direction through the contact of the two protrusions. Figure 9 As shown, when the extruding member 111a and the support wall 113b extrude the preset guide wire 230, the preset guide wire 230 is extruded, and when the extruding member 111a and the support wall 113b release the extruded preset guide wire 230, the preset guide wire 230 restores the cylindrical cross section under the elastic force of itself. Figure 13a As shown, when the extruding member 111a and the support wall 113b extrude the preset guide wire 230, the preset guide wire 230 is extruded, and when the extruding member 111a and the support wall 113b release the extruded preset guide wire 230, the preset guide wire 230 restores the cylindrical cross section under the elastic force of itself.

[0100] Figure 14 As shown, the extruding member 111a is provided with a second protrusion 111a1 for extruding cooperation with the first protrusion 131 in the first state, and the first protrusion 131 and / or the second protrusion 111a1 is provided with an inclined surface 131a for guiding. For example, the first protrusion 131 is provided with the inclined surface 131a while the second protrusion 111a1 is not provided with the inclined surface 131a; or for example, the first protrusion 131 is not provided with the inclined surface 131a while the second protrusion 111a1 is provided with the inclined surface 131a; or for example, both the first protrusion 131 and the second protrusion 111a1 are provided with the inclined surface 131a. When rotating the locking member 130 along the direction of the arrow shown, when the first protrusion 131 and the second protrusion 111a1 contact, the inclined surfaces 131a of the two protrusions contact, and when further rotating the locking member 130, the first protrusion 131 pushes the second protrusion 111a1 along the radial direction through the contact of the two protrusions.

[0101] Figure 15a 、 Figure 15b and Figure 15c are respectively the first, second and third exploded schematic views of the delivery device 20 in an embodiment of the present application.

[0102] As shown in Figure 15a , the second housing 112 is composed of two half shells, Figure 15a , the main housing 113 between the two half shells is shown. As shown in Figure 15b , the main housing 113 includes a first main half shell 1131 and a second main half shell 1132, as shown in Figure 15c , the structure inside the first main half shell 1131 and the second main half shell 1132 is shown after they are separated. As shown in Figure 15b , the first main half shell 1131 and the second main half shell 1132 are closed to form a guide groove 1133 extending in the axial direction.

[0103] As shown in Figure 15c , the fast release operation assembly 140 includes a threaded sleeve 141 and a sleeve core 142. The sleeve core 142 is fixedly connected with the outer sheath 220, and the inner sheath core 213 is threaded through the outer sheath 220 and from the threaded sleeve 141. The sleeve core 142 is provided with a first screw connection part 142a, which is a plurality of convex structures arranged axially spaced, as shown in Figure 15b , the first screw connection part 142a extends from the guide groove 1133. The guide groove 1133 limits the first screw connection part 142a, so that the first screw connection part 142a can only slide in the axial direction of the shell 110. The threaded sleeve 141 is internally provided with a threaded structure, as shown in Figure 15a , the threaded sleeve 141 is sleeved outside the main housing 113, and the threaded sleeve 141 can rotate around the axial direction of the main housing 113.

[0104] The threaded sleeve 141 is detachably connected with the second housing 112, for example, the threaded sleeve 141 can be clamped at the proximal end of the second housing 112, at this time the threaded sleeve 141 can rotate around the axial direction of the second housing 112, but cannot move in the axial direction, at this time the threaded sleeve 141 can drive the sleeve core 142 and the outer sheath 220 to move slowly through the threaded structure to realize the slow release of the stent graft 10. In addition, when the threaded sleeve 141 is disengaged from the clamping of the second housing 112, the threaded sleeve 141 can move away from the second housing 112 in the axial direction, at this time the threaded sleeve 141 still drives the outer sheath 220 to move away from the second housing 112 in the axial direction through the above-mentioned threaded structure, realizing the fast release of the stent graft 10.

[0105] The threaded structure of the threaded sleeve 141 is threadedly connected with the first screw joint 142a, so that when the threaded sleeve 141 is rotated, the sleeve core 142 and the first screw joint 142a are both moved along the axial direction of the shell 110 under the circumferential limiting action of the guide groove 1133, the sleeve core 142 is connected with the outer sheath 220, so as to drive the outer sheath 220 to move along the axial direction of the shell 110, when the outer sheath 220 moves along the axial direction of the shell 110 to the proximal end, the covered stent 10 inside the outer sheath 220 and close to the distal end is released. It can be understood that by rotating the threaded sleeve 141, the outer sheath 220 can be slowly withdrawn to the proximal end, and slow release of the stent is realized.

[0106] When it is necessary to quickly release the stent, the threaded sleeve 141 is directly pulled to the proximal end along the axial direction, the threaded sleeve 141 drives the sleeve core 142 to quickly move to the proximal end of the shell 110, so as to quickly pull the outer sheath 220 to the proximal end, and fast release of the stent is realized.

[0107] The technical features of the above-described embodiments can be combined in any manner. To make the description concise, all possible combinations of the technical features in the above-described embodiments are not described, but as long as the combinations of the technical features do not exist contradictory, they should be considered as the scope of the present disclosure.

[0108] The above-described embodiments only express several embodiments of the present disclosure, and the description is more specific and detailed, but it should not be understood as a limitation on the scope of the patent. It should be pointed out that for ordinary skilled in the art, without departing from the concept of the present disclosure, a number of modifications and improvements can be made, which are all within the scope of the present disclosure. Therefore, the scope of protection of the present patent should be subject to the appended claims.

Claims

1. A conveying device, characterized in that, For delivering a stent into a blood vessel, the delivery device includes: A handle unit includes a housing and an operating element connected to the housing, the operating element being movable at least axially along the housing and movable from a first working position to a second working position in a direction from distal to proximal to the conveying device; and A sheath core assembly, the sheath core assembly comprising a semi-release sheath core and a rear-release sheath core that are both slidably connected to the housing; The operating element includes a stop portion, at least partially located within the housing. The stop portion has a semi-release sliding hole and a rear release sliding hole. The semi-release sheath core slides through the semi-release sliding hole, and the rear release sheath core slides through the rear release sliding hole. The semi-release sheath core has a semi-release driving portion, which is a block structure or formed by bending the semi-release sheath core. The rear release sheath core has a rear release driving portion, which is also a block structure or formed by bending the rear release sheath core, such that the semi-release driving portion and the rear release driving portion cannot pass through the semi-release sliding hole and the rear release sliding hole, respectively. The operating element is configured as follows: When moving from the first working position to the second working position, the stop part and the semi-release drive part are kept in axial contact, the stop part and the rear release drive part are in a separated state and slide relative to the rear release sheath core, the operating element drives the semi-release sheath core to move to the proximal side of the conveying device to release the semi-release restraint on the bracket, and the position of the rear release sheath core relative to the housing remains unchanged; As the device continues to move from the second working position toward the proximal side of the conveying device, the stop part and the rear release drive part remain in contact, and the operating element simultaneously drives the semi-release sheath core and the rear release sheath core to move toward the proximal side of the conveying device. The rear release sheath core moves toward the proximal side of the conveying device to release the rear release restraint on the bracket.

2. The conveying device according to claim 1, characterized in that, The housing has a groove, the operating element is at least partially located inside the housing, and at least another part extends out of the housing through the groove. The part of the operating element located inside the housing is connected to the semi-release sheath core and the rear release sheath core.

3. The conveying device according to claim 2, characterized in that, The slide can be a straight slide, a curved slide, or a bent slide.

4. The conveying device according to claim 2, characterized in that, The chute includes a semi-release section and a rear release section connecting the semi-release section. The second working position is located between the semi-release section and the rear release section. The operating element moves from the first working position to the second working position along the semi-release section. The operating element moves from the second working position to the proximal side of the conveying device along the rear release section.

5. The conveying device according to claim 4, characterized in that, The half-release segment is collinear with the rear-release segment, or the half-release segment is offset from the rear-release segment in the circumferential direction.

6. The conveying device according to claim 4, characterized in that, The chute includes a first stop section and a second stop section, the first stop section, the semi-release section, the second stop section and the rear release section are connected in sequence, and the first stop section and the second stop section respectively include a stop wall for restricting the movement of the operating element along the axial direction of the conveying device.

7. The conveying device according to claim 1, characterized in that, The sheath core assembly includes: The inner sheath core is partially disposed within the housing and partially extends out of the housing; A first locking member is disposed at a position where the inner sheath core is located outside the housing. The semi-release sheath core is detachably connected to the first locking member. When the semi-release sheath core is connected to the first locking member, the first locking member restricts the semi-release sheath core from radially moving away from the inner sheath core and controls the semi-release process of the stent near the first locking member via the semi-release sheath core. A fixed anchor is fixedly connected to the rear release sheath core and can slide along the axial direction of the inner sheath core under the drive of the rear release sheath core, so as to control the rear release process of the bracket.

8. The conveying device according to claim 7, characterized in that, The sheath core assembly includes: The second locking member is disposed at a position where the inner sheath core is located outside the housing and is located near the first locking member. Both the semi-release sheath core and the rear-release sheath core are movably connected to the second locking member. The second locking member is used to restrict the semi-release sheath core and the rear-release sheath core from moving radially away from the inner sheath core.

9. The conveying device according to claim 8, characterized in that, Both the first locking member and the second locking member are sleeve-shaped and are sleeved outside the inner sheath core.

10. The conveying device according to claim 1, characterized in that, The conveying device includes: A pre-placed guide wire is connected to the housing, and the pre-placed guide wire is configured to pass through the outer branch bracket of the support; and An elastic traction member is connected to the pre-placed guidewire. The maximum radial dimension of the elastic traction member in its natural state is greater than the radial dimension of the inner lumen of the external branch stent, so that the pre-placed guidewire can be pulled into the branch blood vessel by the elastic traction member. When the elastic traction member is subjected to radial compression, its radial dimension decreases and it can pass through the inner lumen of the external branch stent.

11. The conveying device according to claim 10, characterized in that, The housing includes: The main housing, the operating element being movably connected to the main housing, the side wall of the main housing having a through hole for the pre-placed guide wire to pass through, and The first outer shell is fixedly sleeved on the outer periphery of the main shell; The handle unit further includes a locking member rotatably sleeved on the first housing. The locking member is configured to cooperate with the housing in a first state to fix the pre-placed guide wire to the housing, and to change from the first state to a second state by rotating relative to the first housing. In the second state, the pre-placed guide wire is slidably connected to the housing.

12. The conveying device according to claim 11, characterized in that, The locking member has an inner cavity, and the main shell passes through the inner cavity. The locking member has a first protrusion on the inner cavity side. The locking member is configured such that, in a first state, the first protrusion and the main shell jointly squeeze the pre-placed guide wire to fix the pre-placed guide wire to the housing, and in a second state, the first protrusion and the main shell release the squeezing of the pre-placed guide wire.

13. The conveying device according to claim 12, characterized in that, The first outer shell is provided with an extrusion member elastically connected to the first outer shell. The main shell has a support wall corresponding to the extrusion member in the radial direction. The locking member is configured such that, in a first state, the first protrusion corresponds to the extrusion member in the radial direction of the outer shell and pushes the extrusion member close to the support wall to clamp a pre-placed guide wire located between the extrusion member and the support wall. In a second state, the first protrusion is offset from the extrusion member, and the extrusion member elastically moves away from the support wall in the radial direction relative to the first outer shell.

14. The conveying device according to claim 13, characterized in that, The extruder is provided with a second protrusion for extruding and engaging with the first protrusion in the first state, and the first protrusion and / or the second protrusion are provided with inclined surfaces for guidance.

15. The conveying device according to claim 11, characterized in that, The housing includes a second outer shell, which is fixedly sleeved on the outer periphery of the main housing, and the second outer shell is closer to the far side of the main housing than the first outer shell; The conveying device includes: The outer sheath tube of the housing is slidably connected to the housing, the outer sheath tube being used to accommodate the support, and the sheath core assembly at least partially passing through the housing and the outer sheath tube. The quick-release operating component is detachably connected to the second housing and to the outer sheath. When the quick-release operating component is separated from the second housing, it can axially drive the outer sheath to slide relative to the second housing.

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