Conveying device

Abstract

The invention relates to a conveying device. Comprising a conveying rod, the conveying rod is provided with a sliding cavity and a communicating structure, the communicating structure communicates with the sliding cavity and the outside, and the conveying rod is used for being arranged in a covered stent in a penetrating mode; the sliding rod is in sliding fit with the sliding cavity; and the clamping jaw is fixed on one of the conveying rod and the sliding rod and can slide relative to the other one of the conveying rod and the sliding rod, and the clamping jaw can extend into or retreat from the communicating structure in the sliding cavity so as to fix or release the covered stent. Due to the fact that the clamping jaw can fix the far end of the covered stent, when other parts of the covered stent are in the release state and attached to the inner wall of the blood vessel, the covered stent is in the semi-release state, and the blood blocking function can be achieved through the combined action of the conveying device and the covered stent in the semi-release state; and blood is effectively prevented from entering the covered stent from the far end. Therefore, the safety and the working efficiency of the operation can be improved.

Description

Technical Field

[0001] This application relates to the technical field of medical devices, and particularly to a delivery device. Background Art

[0002] Delivery devices are usually used to implant covered stents into the body for treating diseases such as thoracic aorta. For traditional delivery devices, during the operation, in order to release the branch stents of the brachiocephalic trunk, left common carotid artery, and left subclavian artery after blocking the blood flow, referring to Figure 1 and Figure 2 , generally, a descending aortic clamp is used for clamping and closing or a balloon occlusion method is adopted. However, using a clamp increases the mechanical trauma to blood vessels, and using a balloon increases the opening of the iliac aorta. Both affect the safety of the operation and also the working efficiency of the operation. Summary of the Invention

[0003] One technical problem solved by this application is how to improve the operation efficiency and safety.

[0004] A delivery device includes:

[0005] A delivery rod, which is provided with a sliding cavity and a communication structure. The communication structure communicates the sliding cavity with the outside, and the delivery rod is used to penetrate through a covered stent;

[0006] A sliding rod, which is slidably matched with the sliding cavity; and

[0007] A claw, which is fixed on one of the delivery rod and the sliding rod and can slide relative to the other. The claw can extend into or withdraw from the communication structure in the sliding cavity to fix the covered stent on the delivery device or release the covered stent from the delivery device.

[0008] In one embodiment, the claw includes a claw unit. The claw unit can extend into / withdraw from the communication structure under its own elastic force. When the claw unit extends into the communication structure, it can hook the distal end of the covered stent to fix the covered stent on the delivery device. When the claw unit withdraws from the communication structure, it disengages from the distal end of the covered stent to release the covered stent from the delivery device.

[0009] In one embodiment, the claw unit is fixedly connected to the delivery rod. The claw unit can extend into the communication structure under the elastic force, and the sliding rod can drive the claw unit to withdraw from the communication structure; or, the claw unit can withdraw from the communication structure under the elastic force, and the sliding rod can drive the claw unit to extend into the communication structure.

[0010] In one embodiment, the communication structure includes a plurality of through holes circumferentially spaced along the conveying rod. The claw further includes a guiding portion fixed in the sliding cavity and closer to the proximal end of the conveying rod relative to the through holes. The claw units are circumferentially spaced on the distal side of the guiding portion. The sliding rod can be slidably sleeved outside the guiding portion and the claw units, and the sliding rod can apply an extrusion force towards the central axis of the conveying rod to the claw units.

[0011] In one embodiment, the claw unit includes an elastic portion and a claw portion. The proximal side of the elastic portion is connected to the guiding portion, and the claw portion is connected to the distal end of the elastic portion at an angle. The claw portion can cooperate with the through hole. In the natural state, when pointing from the proximal end to the distal end of the elastic portion, the distance from the elastic portion to the central axis of the conveying rod gradually increases.

[0012] In one embodiment, the communication structure includes a plurality of through holes circumferentially spaced along the conveying rod. The claw further includes a fixing portion fixed in the sliding cavity and closer to the distal end of the conveying rod relative to the through holes. A plurality of the claw units are circumferentially spaced on the proximal side of the fixing portion. The sliding rod can be inserted into the expansion cavity surrounded by all the claw units and apply an extrusion force away from the central axis of the conveying rod to the claw units.

[0013] In one embodiment, the claw unit includes an elastic portion and a claw portion. The distal end of the elastic portion is connected to the fixing portion, and the claw portion is connected to the proximal end of the elastic portion at an angle. In the natural state, the elastic portion extends along the axial direction of the conveying rod so that the claw portion can withdraw from the through hole.

[0014] In one embodiment, the sliding rod includes a tapered portion. The distal end of the tapered portion is the distal end of the sliding rod. The tapered portion can cooperate with the expansion cavity. When pointing from the proximal end to the distal end of the sliding rod, the cross-sectional dimension of the tapered portion gradually decreases. In the natural state, the minimum cross-sectional dimension of the tapered portion is greater than or equal to the cross-sectional dimension of the expansion cavity.

[0015] In one embodiment, the communication structure includes a plurality of through holes circumferentially spaced along the conveying rod. A guide groove extending a set length along the axial direction of the sliding rod is formed in the sliding rod. The claw unit can pass through the through hole and is in sliding fit with the guide groove. The claw further includes a fixing portion which is fixed in the sliding cavity and is closer to the distal end of the conveying rod relative to the through hole. A plurality of the claw units are circumferentially spaced at the proximal end of the fixing portion. The sliding rod can be disposed around the claw unit and apply a squeezing force towards the central axis of the conveying rod to the claw unit.

[0016] In one embodiment, the claw unit includes an elastic portion and a claw portion. The distal end of the elastic portion is connected to the fixing portion and can be located within the sliding rod. The claw portion is connected to the proximal end of the elastic portion at an angle. In the natural state, when pointing from the distal end to the proximal end of the elastic portion, the distance from the elastic portion to the central axis of the conveying rod gradually increases.

[0017] In one embodiment, the claw unit is fixedly connected to the sliding rod. The claw unit can extend into the communication structure under the action of elastic force, and the conveying rod can drive the claw unit to withdraw from the communication structure; or, the claw unit can withdraw from the communication structure under the action of elastic force, and the conveying rod can drive the claw unit to extend into the communication structure.

[0018] In one embodiment, the communication structure includes a plurality of chutes circumferentially spaced along the conveying rod. The chutes extend a set length along the axial direction of the conveying rod. The conveying rod further includes a convex ring protruding from the inner wall surface of the sliding cavity. The convex ring is closer to the proximal end of the conveying rod relative to the chutes. The claw units are circumferentially spaced at the distal end of the sliding rod. The convex ring can be disposed around the claw unit and apply a squeezing force towards the central axis of the conveying rod to the claw unit.

[0019] In one embodiment, the claw unit includes an elastic portion and a claw portion. The proximal side of the elastic portion is connected to the sliding rod. The claw portion is connected to the distal end of the elastic portion at an angle. The claw portion can be in sliding fit with the chute. In the natural state, when pointing from the proximal end to the distal end of the elastic portion, the distance from the elastic portion to the central axis of the conveying rod gradually increases.

[0020] In one embodiment, the communication structure includes a plurality of chutes circumferentially spaced along the conveying rod. The chutes extend a set length along the axial direction of the conveying rod. The conveying rod includes a conveying main body and an inner sleeve. The sliding cavity is formed in the conveying main body. The inner sleeve is connected to the conveying main body and is located in the sliding cavity. A guiding cavity communicating with the chutes is formed between the inner sleeve and the conveying main body. The claw unit can be received in the guiding cavity, and the inner sleeve can apply a squeezing force to the claw unit in a direction away from the central axis of the conveying rod.

[0021] In one embodiment, the claw unit includes an elastic part and a claw part. The proximal end of the elastic part is connected to the sliding rod. The claw part is connected to the distal end of the elastic part at an angle and can slidably cooperate with the chute. The elastic part can be received in the guiding cavity. From the distal end to the proximal end of the conveying rod, the cross-sectional dimension of the inner sleeve gradually decreases so that the width of the guiding cavity gradually increases. In the natural state, the elastic part extends along the axial direction of the conveying rod so that the claw part withdraws from the chute.

[0022] In one embodiment, the conveying rod includes a conveying main body and an outer sleeve. The outer sleeve is sleeved outside the conveying main body and a limiting cavity is formed between the outer sleeve and the conveying main body. The opening of the limiting cavity faces the proximal end of the conveying main body, and the limiting cavity communicates with the communication structure.

[0023] In one embodiment, from the distal end to the proximal end of the conveying main body, the width of the limiting cavity remains constant or gradually increases.

[0024] One technical effect of an embodiment of the present application is that: in view that the claw can fix the distal end of the covered stent, when other parts of the covered stent are in the released state and are in contact with the inner wall of the blood vessel, the covered stent is in a semi-released state. Therefore, through the combined action of the conveying device and the semi-released covered stent, the function of blocking blood can be achieved, effectively preventing blood from entering the covered stent from the distal end. On the one hand, this reduces the trauma to the human body caused by other auxiliary devices, thereby improving the safety of the operation. On the other hand, the operation of other auxiliary devices can be omitted, and only the conveying device itself needs to be operated, reducing the operation time, thereby improving the working efficiency of the operation. When it is necessary to release the covered stent, the claw is released to release the covered stent. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 Schematic diagram of using a clamp to clamp a blood vessel to achieve blood flow blockage.

[0026] Figure 2 Schematic diagram of using a balloon to block a blood vessel to achieve blood flow blockage.

[0027] Figure 3 Schematic diagram of using a conveying device and cooperating with the semi-released state of a covered stent to achieve blood blockage.

[0028] Figure 4 Schematic perspective view of the conveying device provided in the first embodiment.

[0029] Figure 5 For Figure 4 Exploded structural schematic diagram of the shown conveying device.

[0030] Figure 6 For Figure 4 Schematic plan sectional view of the assembled conveying device shown.

[0031] Figure 7 For Figure 4 Schematic plan sectional view of the exploded conveying device shown.

[0032] Figure 8 For Figure 4 Schematic perspective sectional view of the conveying rod in the shown conveying device.

[0033] Figure 9 For Figure 4 Schematic perspective view of the claw in the shown conveying device.

[0034] Figure 10 For Figure 9 Schematic perspective sectional view of the shown claw.

[0035] Figure 11 Schematic perspective view of the conveying device provided in the second embodiment.

[0036] Figure 12 For Figure 11 Schematic perspective view of the claw in the shown conveying device.

[0037] Figure 13 For Figure 11 Schematic plan sectional view of the assembled conveying device shown.

[0038] Figure 14 For Figure 11 Schematic plan sectional view of the exploded conveying device shown.

[0039] Figure 15 Exploded structural schematic diagram of the conveying device provided in the third embodiment.

[0040] Figure 16 For Figure 15 Schematic plan sectional view of the assembled conveying device shown.

[0041] Figure 17 ForFigure 15 Schematic diagram of the plane sectional structure of the shown conveying device after disassembly.

[0042] Figure 18 Schematic diagram of the disassembled structure of the conveying device provided for the fourth embodiment.

[0043] Figure 19 For Figure 18 Schematic diagram of the disassembled structure of the shown conveying device.

[0044] Figure 20 For Figure 18 Schematic diagram of the plane sectional structure of the shown conveying device after assembly.

[0045] Figure 21 For Figure 18 Schematic diagram of the plane sectional structure of the shown conveying device after disassembly.

[0046] Figure 22 For Figure 18 Schematic diagram of the three-dimensional sectional structure of the conveying rod in the shown conveying device.

[0047] Figure 23 Schematic diagram of the disassembled structure of the conveying device provided for the fifth embodiment.

[0048] Figure 24 Schematic diagram of the disassembled structure of the conveying device shown in body 23.

[0049] Figure 25 For Figure 23 Schematic diagram of the plane sectional structure of the shown conveying device after assembly.

[0050] Figure 26 For Figure 23 Schematic diagram of the plane sectional structure of the shown conveying device after disassembly.

[0051] Figure 27 For Figure 23 Schematic diagram of the three-dimensional sectional structure of the first example conveying rod in the shown conveying device.

[0052] Figure 28 For Figure 23 Schematic diagram of the three-dimensional sectional structure of the second example conveying rod in the shown conveying device. Detailed implementation manners

[0053] To make the above objects, features, and advantages of the present application more apparent and understandable, the following will describe the detailed implementation manners of the present application in conjunction with the accompanying drawings. Many specific details are set forth in the following description in order to fully understand 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 departing from the connotation of the present application. Therefore, the present application is not limited by the specific embodiments disclosed below.

[0054] In the description of the present application, it should be understood that if terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or positional relationship indicated by these terms is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation on the present application.

[0055] In addition, if terms such as "first" and "second" appear, these terms are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In the description of the present application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0056] In the present application, unless otherwise clearly specified and limited, if terms such as "mounted", "connected", "connected to", "fixed", etc. appear, these terms should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0057] In the present application, unless otherwise clearly specified and limited, if there is a description such as a first feature being "on" or "under" a second feature, the meaning may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on" 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 at a higher horizontal level than the second feature. The first feature being "under", "beneath" and "under" the second feature may be that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is at a lower horizontal level than the second feature.

[0058] It should be noted that if an element is referred to as "fixed to" or "disposed on" another element, it can be directly on the other element or there may be an intermediate element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intermediate element at the same time. If present, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are only for the purpose of illustration and do not represent the only implementation.

[0059] In this application, one end of each component close to the operator is denoted as the "proximal end", and the end far from the operator is denoted as the "distal end".

[0060] Referring to Figure 4 , Figure 5 , Figure 6 and Figure 7 , the delivery device 100 provided in this application can be used to implant the covered stent 20 into a preset position, such as the thoracic aorta, so as to treat diseases. The delivery device 100 includes a delivery rod 110, a sliding rod 120 and a claw 130. The delivery rod 110 is provided with a sliding cavity 1111 and a communication structure 113. The communication structure 113 communicates the outside and the sliding cavity 1111. The delivery rod 110 is used to pass through the covered stent 20, so that the distal end of the covered stent 20 is sleeved on the delivery rod 110. The sliding cavity 1111 extends along the axial direction of the delivery rod 110. The sliding rod 120 is slidably matched with the sliding cavity 1111, so that the sliding rod 120 can slide relative to the delivery rod 110 along the axial direction of the delivery rod 110. For both the delivery rod 110 and the sliding rod 120, the claw 130 is fixedly connected to one of them and can slide relative to the other. When the claw 130 extends from the sliding cavity 1111 into the communication structure 113, the claw 130 can further extend from the communication structure 113 to fix the distal end of the covered stent 20. When the claw 130 withdraws from the communication structure 113, the fixing and binding effect of the claw 130 on the covered stent 20 can be released, so that the covered stent 20 can be released to expand and anchor at the designated position. Exemplarily, the claw 130 includes a claw unit. The claw unit can extend into / withdraw from the communication structure under its own elastic force. When the claw unit extends into the communication structure, it can hook the distal end of the covered stent to fix the covered stent on the delivery device. When the claw unit withdraws from the communication structure, it disengages from the distal end of the covered stent to release the covered stent from the delivery device.

[0061] During the operation, to prevent blood from entering the covered stent 20 from the distal end, referring to Figure 1 , if the mode of using the clamp 30 to clamp the blood vessel to block the blood is adopted, the extrusion force of the clamp 30 will cause mechanical damage to the blood vessel, thereby affecting the safety of the operation, and the operation of the clamp 30 will also affect the working efficiency of the operation. Referring to Figure 2, if the operation mode of placing the inflatable balloon 40 in the blood vessel is adopted, the expansion force of the inflatable balloon 40 increases the opening of the iliac aorta, which will also cause certain damage to the blood vessel, and also affects the safety of the operation. Moreover, the inflatable balloon 40 will also affect the working efficiency of the operation.

[0062] Refer to Figure 3 , for the delivery device 100 of the present application, after the delivery device 100 delivers the covered stent 20 to the set position, since the claw 130 extends from the communication structure 113 to fix the distal end of the covered stent 20, and the other parts of the covered stent 20 are in a released state and fit against the inner wall of the blood vessel. Given that the covered stent 20 is sleeved on the delivery rod 110 and the distal end is fixed, at this time, the covered stent 20 can be understood to be in a semi-released state. Through the combined action of the delivery device 100 and the semi-released covered stent 20, the function of blocking blood can be achieved, effectively preventing blood from entering the covered stent 20 from the distal end. In this way, on the one hand, the damage to the blood vessel caused by additional devices such as the clamp 30 and the inflatable balloon 40 is eliminated, that is, the trauma is reduced, thereby improving the safety of the operation. On the other hand, the operations of additional devices such as the clamp 30 and the inflatable balloon 40 can be omitted, and only the delivery device 100 itself needs to be operated, reducing the operation time, thereby improving the working efficiency of the operation. When it is necessary to fully release the covered stent 20, the claw 130 can be withdrawn from the communication structure 113 to release the fixation of the covered stent 20. The delivery device 100 of the present application can form at least the following several embodiments:

[0063] First Embodiment

[0064] Refer to Figure 4 、 Figure 5 、 Figure 6 and Figure 7 , the delivery device 100 includes a delivery rod 110, a sliding rod 120 and a claw 130. The delivery rod 110 is provided with a sliding cavity 1111 and a communication structure 113. The communication structure 113 communicates the outside and the sliding cavity 1111. The delivery rod 110 is used to be inserted into the covered stent 20 so that the distal end of the covered stent 20 is sleeved on the delivery rod 110. The sliding cavity 1111 extends along the axial direction of the delivery rod 110, and the sliding rod 120 is slidably matched with the sliding cavity 1111 so that the sliding rod 120 can slide relative to the delivery rod 110 along the axial direction of the delivery rod 110.

[0065] Refer to Figure 6 、 Figure 7 and Figure 8, the conveying rod 110 includes a conveying main body 111 and an outer sleeve 112. The outer sleeve 112 is sleeved outside the conveying main body 111, such that a part of the outer sleeve 112 is fixedly connected to the conveying main body 111, and another part of the outer sleeve 112 is arranged around the conveying main body 111, so that an annular limiting cavity 114 is formed between the outer sleeve 112 and the conveying main body 111. Along the axial direction of the conveying rod 110, the distal end of the limiting cavity 114 is closed and the proximal end is not closed, such that the opening of the limiting cavity 114 faces the proximal end of the conveying main body 111. A sliding cavity 1111 is arranged on the conveying main body 111, and the limiting cavity 114 is communicated with the sliding cavity 1111 through a communicating structure 113. A part of the membrane stent 20 near the distal end can be received in the limiting cavity 114. Through the limiting effect of the limiting cavity 114, the fixing effect of the distal end of the membrane stent 20 can be enhanced to a certain extent.

[0066] Refer to Figure 6 , Figure 7 and Figure 8 , pointing from the distal end to the proximal end of the conveying main body 111, the width of the limiting cavity 114 can remain constant or increase. When the width of the limiting cavity 114 remains constant, the inner surface of the outer sleeve 112 and the outer surface of the conveying main body 111 both extend along the axial direction of the conveying main body 111, which can be understood as the inner surface of the outer sleeve 112 and the outer surface of the conveying main body 111 being arranged in parallel; when the width of the limiting cavity 114 increases, the inner surface of the outer sleeve 112 extends in a direction forming an angle with the axial direction of the conveying main body 111, while the outer surface of the conveying main body 111 extends along the axial direction of the conveying main body 111, which can be understood as the inner surface of the outer sleeve 112 and the outer surface of the conveying main body 111 intersecting. When the width of the limiting cavity 114 gradually increases, the release resistance of the membrane stent 20 can be reduced to a certain extent, and the release efficiency of the membrane stent 20 can be improved.

[0067] Refer to Figure 6 , Figure 7 and Figure 8 , the communicating structure 113 can include through holes 1131. The number of the through holes 1131 is multiple. The multiple through holes 1131 are all arranged on the conveying main body 111, and the multiple through holes 1131 are arranged at intervals along the circumferential direction of the conveying main body 111. The through holes 1131 will communicate the limiting cavity 114 and the sliding cavity 1111.

[0068] Refer to Figure 6 , Figure 7 , Figure 9 and Figure 10, the jaw 130 is fixedly connected to the conveying rod 110. The jaw 130 may include a guiding portion 133, a fixing portion 132, a connecting portion 134, and jaw units 131. The number of jaw units 131 corresponds one-to-one with the number of through holes 1131. The guiding portion 133 may be generally cylindrical in structure. The guiding portion 133 is located within the sliding cavity 1111 and is closer to the proximal end of the conveying rod 110 relative to the through hole 1131. The conveying body 111 is disposed around the guiding portion 133 such that there is an annular gap between the guiding portion 133 and the conveying body 111. The sliding rod 120 may be a hollow tubular structure such that the guiding portion 133 can slidably cooperate with the inner cavity of the sliding rod 120, and the sliding rod 120 slidably cooperates with the annular gap, thereby enabling the sliding rod 120 to be slidably sleeved outside the guiding portion 133. The fixing portion 132 may also be generally cylindrical in structure. The fixing portion 132 is located within the sliding cavity 1111 and is fixedly connected to the conveying body 111. For example, the fixing portion 132 can be fixed by gluing or welding. The fixing portion 132 and the guiding portion 133 are axially spaced along the conveying body 111 such that the fixing portion 132 is closer to the distal end of the conveying body 111 relative to the guiding portion 133. The connecting portion 134 may be a strip-like structure. The connecting portion 134 extends axially along the conveying body 111. The proximal end of the connecting portion 134 is connected to the guiding portion 133, and the distal end of the connecting portion 134 is connected to the fixing portion 132, such that the connecting portion 134 is connected between the fixing portion 132 and the guiding portion 133. The number of connecting portions 134 may be multiple, and the multiple connecting portions 134 are circumferentially spaced along the fixing portion 132.

[0069] Refer to Figure 6 , Figure 7 , Figure 9 and Figure 10 , the jaw unit 131 protrudes axially along the conveying rod 110 at the distal end of the guiding portion 133, and the multiple jaw units 131 are circumferentially spaced along the guiding portion 133. The jaw unit 131 corresponds to the gap between two adjacent connecting portions 134, such that the jaw unit 131 can be located within the gap between two adjacent connecting portions 134. When the entire jaw 130 is in a natural state without external force, the multiple jaw units 131 can be disposed around the connecting portion 134. Through the fixed connection between the fixing portion 132 and the conveying body 111, the fixed connection between the entire jaw 130 and the conveying rod 110 can be achieved. Of course, the setting of the fixing portion 132 can also be omitted, such that the connecting portion 134 is directly fixed to the conveying body 111; the connecting portion 134 can also be a cylindrical tubular structure.

[0070] Refer to Figure 6 , Figure 7 , Figure 9 and Figure 10, the jaw unit 131 may include an elastic part 1311 and a jaw part 1312. The proximal end of the elastic part 1311 is connected to the guiding part 133, and the jaw part 1312 is connected to the distal end of the elastic part 1311 at an angle, such that the whole jaw unit 131 is in a bent state. When the jaw unit 131 is in the natural state, pointing from the proximal end to the distal end of the elastic part 1311, the distance from the elastic part 1311 to the central axis of the conveying rod 110 may gradually increase, so that the elastic part 1311 is arranged at an angle with the axial direction of the conveying rod 110. It can also be generally understood that the elastic part 1311 is inclined relative to the axial direction of the conveying rod 110. The elastic part 1311 has a certain elastic force. When an extrusion force towards the central axis of the conveying rod 110 is applied to the elastic part 1311, the elastic part 1311 can overcome its own elastic force and gradually move closer to the central axis of the conveying rod 110, thereby reducing the angle between the elastic part 1311 and the axial direction of the conveying rod 110. In the natural state, all the elastic parts 1311 can be regarded as a frustum of a cone. The outer diameter of the proximal end of this frustum of a cone is the smallest and can be approximately equal to the inner diameter of the sliding rod 120, while the outer diameters of other parts of this frustum of a cone are all larger than the inner diameter of the sliding rod 120. The sliding rod 120 can be sleeved on this frustum of a cone. In view of the fact that the jaw part 1312 is connected to the elastic part 1311 at an angle, the jaw part 1312 can be arranged relatively farther away from the central axis of the conveying rod 110 than the elastic part 1311, so that the jaw part 1312 can cooperate with the through hole 1131.

[0071] Refer to Figure 6 and Figure 7 , when the sliding rod 120 is only sleeved outside the guiding part 133, and the sliding rod 120 is not sleeved on the frustum of a cone formed by all the elastic parts 1311, the jaw unit 131 is in the natural state. Under the action of the elastic force, the elastic part 1311 will drive the jaw part 1312 to extend into the through hole 1131 and further extend into the limiting cavity 114 from the through hole 1131, so as to form a clamping effect with the corrugated ring at the distal end of the covered stent 20, making the distal end of the covered stent 20 in a fixed state.

[0072] When the slide bar 120 gradually slides toward the through hole 1131, so that the slide bar 120 is sleeved on the frustum-like body formed by all the elastic parts 1311, in the process of the slide bar 120 gradually sliding toward the far end of the frustum-like body, since the inner diameter of the slide bar 120 is smaller than the outer diameter of the frustum-like body, the slide bar 120 will overcome the elastic force of the elastic part 1311 and apply an extrusion force to the elastic part 1311 toward the central axis of the conveying rod 110, so that the elastic part 1311 swings close to the central axis of the conveying rod 110, and then the slide bar 120 produces a radial compression effect on the frustum-like body. During the swinging of the elastic part 1311 close to the central axis of the conveying rod 110, the elastic part 1311 will drive the claw part 1312 to gradually withdraw from the through hole 1131, and then the claw part 1312 will completely withdraw from the limiting cavity 114 and release the hanging relationship formed with the wave ring at the far end of the coating bracket 20, thereby releasing the fixing and restraining effect of the entire claw 130 on the coating bracket 20, thereby facilitating the release of the coating bracket 20.

[0073] Therefore, when the claw 130 is required to fix the distal end of the stent graft 20 so that the stent graft 20 is in a semi-released state to block the blood, the slide bar 120 can be completely separated from the elastic portion 1311. When the stent graft 20 needs to be completely released, the slide bar 120 can be gradually moved closer to the distal end of the frustum-like body formed by all the elastic portions 1311, so that the claw portion 1312 is completely withdrawn from the limiting cavity 114, thereby achieving the release of the stent graft 20.

[0074] The conveying device 100 may further include a guide wire head 140 , which may be disposed at the distal end of the conveying body 111 to block the sliding cavity 1111 of the conveying body 111 . The guide wire may be passed through the sliding rod 120 , the claw 130 and the guide wire head 140 .

[0075] Second Embodiment

[0076] The main difference between the conveying device 200 provided in the second embodiment and the conveying device 100 provided in the first embodiment lies in the structures of the claws 230 and the sliding rod 220 .

[0077] See also Figure 11 , Figure 12 , Figure 13 and Figure 14, the conveying device 200 includes a conveying rod 210, a sliding rod 220, and a clamping jaw 230. The conveying rod 210 is provided with a sliding cavity 2111 and a communication structure 213. The communication structure 213 communicates the outside with the sliding cavity 2111. The conveying rod 210 is used to be inserted into the covered stent 20 such that the distal end of the covered stent 20 is sleeved on the conveying rod 210. The sliding cavity 2111 extends along the axial direction of the conveying rod 210, and the sliding rod 220 is slidably engaged with the sliding cavity 2111 such that the sliding rod 220 can slide relative to the conveying rod 210 along the axial direction of the conveying rod 210.

[0078] Refer to Figure 11 , Figure 12 , Figure 13 and Figure 14 , the conveying rod 210 includes a conveying main body 211 and an outer sleeve 212. The outer sleeve 212 is sleeved outside the conveying main body 211 such that a part of the outer sleeve 212 is fixedly connected to the conveying main body 211, and another part of the outer sleeve 212 surrounds the conveying main body 211, thereby forming an annular limiting cavity 214 between the outer sleeve 212 and the conveying main body 211. Along the axial direction of the conveying rod 210, the distal end of the limiting cavity 214 is closed and the proximal end is not closed, such that the opening of the limiting cavity 214 faces the proximal end of the conveying main body 211. The sliding cavity 2111 is provided on the conveying main body 211, and the limiting cavity 214 communicates with the sliding cavity 2111 through the communication structure 213. A part of the covered stent 20 near the distal end can be received in the limiting cavity 214. Through the limiting effect of the limiting cavity 214, the fixing effect of the distal end of the covered stent 20 can be enhanced to a certain extent.

[0079] Pointing from the distal end to the proximal end of the conveying main body 211, the width of the limiting cavity 214 can remain constant or increase. When the width of the limiting cavity 214 remains constant, the inner surface of the outer sleeve 212 and the outer surface of the conveying main body 211 both extend along the axial direction of the conveying main body 211, which can be understood as the inner surface of the outer sleeve 212 and the outer surface of the conveying main body 211 being parallel; when the width of the limiting cavity 214 increases, the inner surface of the outer sleeve 212 extends in a direction forming an angle with the axial direction of the conveying main body 211, while the outer surface of the conveying main body 211 extends along the axial direction of the conveying main body 211, which can be understood as the inner surface of the outer sleeve 212 and the outer surface of the conveying main body 211 intersecting. When the width of the limiting cavity 214 gradually increases, the release resistance of the covered stent 20 can be reduced to a certain extent, and the release efficiency of the covered stent 20 can be improved.

[0080] The communication structure 213 can include through holes 2131. The number of the through holes 2131 is multiple. The multiple through holes 2131 are all provided on the conveying main body 211, and the multiple through holes 2131 are arranged at intervals along the circumferential direction of the conveying main body 211. The through holes 2131 will communicate the limiting cavity 214 and the sliding cavity 2111.

[0081] The jaw 230 is fixedly connected to the conveying rod 210. The jaw 230 includes a fixing portion 232 and a jaw unit 231. The number of the jaw units 231 is equal to the number of the through holes 2131, forming a one-to-one correspondence. The fixing portion 232 can be generally a cylindrical structure. The fixing portion 232 is located in the sliding cavity 2111, and the fixing portion 232 is fixedly connected to the conveying main body 211. For example, the fixing portion 232 can be fixed by gluing or welding. The jaw units 231 are protrudingly arranged along the axial direction of the conveying rod 210 at the proximal end of the fixing portion 232, and a plurality of jaw units 231 are arranged at intervals along the circumferential direction of the fixing portion 232. Through the fixed connection between the fixing portion 232 and the conveying main body 211, the fixed connection between the entire jaw 230 and the conveying rod 210 can be realized.

[0082] The jaw unit 231 can include an elastic portion 2311 and a jaw portion 2312. The distal end of the elastic portion 2311 is connected to the fixing portion 232, and the jaw portion 2312 is connected to the proximal end of the elastic portion 2311 at an angle, so that the entire jaw unit 231 is in a bent state. When the jaw unit 231 is in a natural state, the elastic portion 2311 can extend along the axial direction of the conveying rod 210. The elastic portion 2311 has a certain elasticity. When an extrusion force is applied to the elastic portion 2311 in a direction away from the central axis of the conveying rod 210, the elastic portion 2311 can overcome its own elastic force and gradually move away from the central axis of the conveying rod 210, so that an angle is formed between the elastic portion 2311 and the axial direction of the conveying rod 210. In the natural state, all the elastic portions 2311 can be regarded as a quasi-cylindrical body, and the cavity surrounded by the quasi-cylindrical body is denoted as the expansion cavity 2313. The minimum cross-sectional dimension of the sliding rod 220 can be greater than or equal to the cross-sectional dimension of the expansion cavity 2313. It can be understood that the minimum outer diameter of the sliding rod 220 is greater than or equal to the inner diameter of the expansion cavity 2313. When the sliding rod 220 is inserted into the expansion cavity 2313, the sliding rod 220 will form an interference fit relationship with the expansion cavity 2313, so that the sliding rod 220 applies an extrusion force to the elastic portion 2311 in a direction away from the central axis of the conveying rod 210, thereby causing the elastic portion 2311 to overcome its own elastic force and gradually move away from the central axis of the conveying rod 210.

[0083] The sliding rod 220 may include a cylindrical portion 221 and a conical portion 222. The cylindrical portion 221 and the conical portion 222 are coaxially arranged. The cross-sectional dimension of the cylindrical portion 221 remains constant, and the cylindrical portion 221 is in sliding fit with the sliding cavity 2111. The cross-sectional dimension of the conical portion 222 is smaller than that of the cylindrical portion 221. The conical portion 222 is connected to the distal end of the cylindrical portion 221. Pointing from the proximal end to the distal end of the sliding rod 220, the cross-sectional dimension of the conical portion 222 gradually decreases. Obviously, the distal end of the conical portion 222 is also the distal end of the entire sliding rod 220. When the claw 230 is in the natural state, the minimum cross-sectional dimension of the conical portion 222 is greater than or equal to the cross-sectional dimension of the expansion cavity 2313.

[0084] When the entire sliding rod 220 is outside the expansion cavity 2313 of the claw 230, the claw 230 is in the natural state. The elastic portion 2311 extends along the axial direction of the conveying rod 210, so that the claw portion 2312 is located outside the limiting cavity 214. The claw portion 2312 will not be able to form a latching relationship with the corrugations at the distal end of the covered stent 20. In this way, the fixing and binding effect of the entire claw 230 on the covered stent 20 will be eliminated, facilitating the release of the covered stent 20.

[0085] During the process of the sliding rod 220 sliding relative to the sliding cavity 2111 and the conical portion 222 gradually inserting into the expansion cavity 2313, considering the cross-sectional dimension of the conical portion 222 gradually increasing when pointing from the distal end to the proximal end of the sliding rod 220, the conical portion 222 will exert an expanding effect on the expansion cavity 2313, increasing the inner diameter of the expansion cavity 2313. Subsequently, the elastic portion 2311 overcomes its own elastic force and moves away from the central axis of the conveying rod 210. The elastic portion 2311 will drive the claw portion 2312 to move away from the central axis of the conveying rod 210. The included angle between the extending direction of the elastic portion 2311 and the central axis of the conveying rod 210 gradually increases. The claw portion 2312 will gradually extend into the through hole 2131 and the limiting cavity 214. The claw portion 2312 will form a latching effect with the corrugations at the distal end of the covered stent 20, fixing the distal end of the covered stent 20.

[0086] Therefore, when the jaws 230 are required to fix the distal end of the covered stent 20 so that the covered stent 20 forms a semi-released state to block the blood, the tapered portion 222 of the sliding rod 220 can be inserted into the expansion cavity 2313 of the jaws 230, so that the jaw portion 2312 extends into the limiting cavity 214 to form a locking relationship with the corrugated ring at the distal end of the covered stent 20, and finally the distal end of the covered stent 20 is fixed. When the covered stent 20 needs to be fully released, the tapered portion 222 of the sliding rod 220 can be completely withdrawn from the expansion cavity 2313. Under the action of the self-elastic force of the elastic portion 2311, the elastic portion 2311 will return to its natural state, so that the jaw portion 2312 withdraws from the limiting cavity 214 to release the binding effect on the covered stent 20, and finally the full release of the covered stent 20 is achieved.

[0087] The delivery device 200 may further include a guide wire head 240. The guide wire head 240 may be disposed at the distal end of the delivery body 211 to block the sliding cavity 2111 of the delivery body 211. The guide wire may be threaded through the sliding rod 220, the jaws 230, and the guide wire head 240.

[0088] Third Embodiment

[0089] The main difference between the delivery device 300 provided in the third embodiment and the delivery device 200 provided in the second embodiment lies in the structures of the jaws and the sliding rod.

[0090] Refer to Figure 15 、 Figure 16 and Figure 17 As shown in, the delivery device 300 includes a delivery rod 310, a sliding rod 320, and jaws 330. The delivery rod 310 is provided with a sliding cavity 3111 and an outer sleeve communication structure 313. The outer sleeve communication structure 313 communicates the outside and the sliding cavity 3111. The delivery rod 310 is used to be threaded through the covered stent 20 so that the distal end of the covered stent 20 is sleeved on the delivery rod 310. The sliding cavity 3111 extends along the axial direction of the delivery rod 310. The sliding rod 320 is slidably engaged with the sliding cavity 3111 so that the sliding rod 320 can slide axially relative to the delivery rod 310 along the axial direction of the delivery rod 310.

[0091] The conveying rod 310 includes a conveying main body 311 and an outer sleeve 312. The outer sleeve 312 is sleeved outside the conveying main body 311, such that a part of the outer sleeve 312 is fixedly connected to the conveying main body 311, and another part of the outer sleeve 312 is disposed around the conveying main body 311, thereby forming an annular limiting cavity 314 between the outer sleeve 312 and the conveying main body 311. Along the axial direction of the conveying rod 310, the distal end of the limiting cavity 314 is closed and the proximal end is not closed, such that the opening of the limiting cavity 314 faces the proximal end of the conveying main body 311. A sliding cavity 3111 is disposed on the conveying main body 311. The limiting cavity 314 is in communication with the sliding cavity 3111 through an outer sleeve communication structure 313. A part of the membrane stent 20 near the distal end can be received in the limiting cavity 314. Through the limiting effect of the limiting cavity 314, the fixing effect of the distal end of the membrane stent 20 can be enhanced to a certain extent.

[0092] Pointing from the distal end to the proximal end of the conveying main body 311, the width of the limiting cavity 314 can remain constant or increase. When the width of the limiting cavity 314 remains constant, the inner surface of the outer sleeve 312 and the outer surface of the conveying main body 311 both extend along the axial direction of the conveying main body 311, which can be understood as the inner surface of the outer sleeve 312 and the outer surface of the conveying main body 311 being arranged in parallel; when the width of the limiting cavity 314 increases, the inner surface of the outer sleeve 312 extends in a direction forming an angle with the axial direction of the conveying main body 311, while the outer surface of the conveying main body 311 extends along the axial direction of the conveying main body 311, which can be understood as the inner surface of the outer sleeve 312 and the outer surface of the conveying main body 311 intersecting. When the width of the limiting cavity 314 gradually increases, the release resistance of the membrane stent 20 can be reduced to a certain extent, and the release efficiency of the membrane stent 20 can be improved.

[0093] The outer sleeve communication structure 313 can include through holes 3131. The number of the through holes 3131 is multiple. The multiple through holes 3131 are all disposed on the conveying main body 311, and the multiple through holes 3131 are spaced along the circumferential direction of the conveying main body 311. The through holes 3131 will communicate the limiting cavity 314 and the sliding cavity 3111.

[0094] The jaw 330 is fixedly connected to the conveying rod 310. The jaw 330 includes a fixing part 332 and a jaw unit 331. The number of jaw units 331 is equal to the number of through holes 3131, forming a one-to-one correspondence. The fixing part 332 can be generally cylindrical in structure. The fixing part 332 is located in the sliding cavity 3111 and is fixedly connected to the conveying body 311. For example, the fixing part 332 can be fixed by gluing or welding. The jaw unit 331 protrudes axially along the conveying rod 310 at the proximal end of the fixing part 332, and a plurality of jaw units 331 are arranged at intervals along the circumferential direction of the fixing part 332. Through the fixed connection between the fixing part 332 and the conveying body 311, the entire jaw 330 can be fixedly connected to the conveying rod 310.

[0095] The jaw unit 331 can include an elastic part 3311 and a jaw part 3312. The distal end of the elastic part 3311 is connected to the fixing part 332, and the jaw part 3312 is connected to the proximal end of the elastic part 3311 at an angle, so that the entire jaw unit 331 is in a bent state. When the jaw unit 331 is in the natural state, pointing from the distal end to the proximal end of the elastic part 3311, the distance from the elastic part 3311 to the central axis of the conveying rod 310 can gradually increase. In this way, the elastic part 3311 is arranged at an angle to the axial direction of the conveying rod 310. It can also be generally understood that the elastic part 3311 is inclined relative to the axial direction of the conveying rod 310. The elastic part 3311 has a certain elastic force. When an extrusion force is applied to the elastic part 3311 towards the central axis of the conveying rod 310, the elastic part 3311 can overcome its own elastic force and gradually move closer to the central axis of the conveying rod 310, so that the angle between the elastic part 3311 and the axial direction of the conveying rod 310 decreases. In the natural state, all the elastic parts 3311 can be regarded as a frustum of a cone. The outer diameter of the proximal end of the frustum of the cone is the largest and can be approximately equal to the inner diameter of the sliding rod 320, while the outer diameters of other parts of the frustum of the cone are all smaller than the inner diameter of the sliding rod 320. The sliding rod 320 can be sleeved on the frustum of the cone, that is, the sliding rod 320 is arranged around the frustum of the cone. In view of the fact that the jaw part 3312 is connected to the elastic part 3311 at an angle, the jaw part 3312 can be arranged farther from the central axis of the conveying rod 310 relative to the elastic part 3311.

[0096] The sliding rod 320 is provided with guide grooves 321. The number of guide grooves 321 is equal to the number of through holes 3131, forming a one-to-one correspondence. A plurality of guide grooves 321 are arranged at intervals along the circumferential direction of the sliding rod 320, and the guide grooves 321 extend axially along the sliding rod 320 for a certain length. The jaw part 3312 can be slidably matched with the guide grooves 321 and extend into the limiting cavity 314 through the through holes 3131.

[0097] When the sliding rod 320 is sleeved outside the frustum-like body and the distal end of the guide groove 321 maintains a certain distance from the claw portion 3312, the elastic portion 3311 is in a natural state, and the claw portion 3312 extends into the limiting cavity 314 through the guide groove 321 and the through hole 3131 in turn, so that the claw portion 3312 and the wave ring at the distal end of the coating bracket 20 form a hanging effect, so that the distal end of the coating bracket 20 is in a fixed state.

[0098] When the sliding rod 320 is sleeved outside the frustum-like body and the sliding rod 320 slides relative to the sliding cavity 3111 so that the distal end of the guide groove 321 contacts the claw portion 3312, the sliding rod 320 will generate a force on the elastic portion 3311 through the claw portion 3312, and the sliding rod 320 will overcome the elastic force of the elastic portion 3311 and apply an extrusion force to the elastic portion 3311 toward the central axis of the conveying rod 310, so that the elastic portion 3311 swings close to the central axis of the conveying rod 310, and then the sliding rod 320 generates a radial compression effect on the frustum-like body. During the swinging of the elastic part 3311 close to the central axis of the conveying rod 310, the elastic part 3311 will drive the claw part 3312 to gradually withdraw from the through hole 3131, and then the claw part 3312 will completely withdraw from the limiting cavity 314 and release the hanging relationship formed with the wave ring at the far end of the coating bracket 20, thereby releasing the fixing and restraining effect of the entire claw 330 on the coating bracket 20, thereby facilitating the release of the coating bracket 20.

[0099] Therefore, when the claw 330 is required to fix the distal end of the stent graft 20 so that the stent graft 20 forms a semi-released state to block the blood, the sliding rod 320 can slide relative to the sliding cavity 3111 so that the distal end of the guide groove 321 maintains a certain distance from the claw portion 3312, so that the claw portion 3312 extends into the limiting cavity 314 through the guide groove 321 and the through hole 3131 to clamp the wave ring at the distal end of the stent graft 20, and finally fix the distal end of the stent graft 20. When the stent graft 20 needs to be completely released, the sliding rod 320 can slide relative to the sliding cavity 3111 so that the distal end of the guide groove 321 contacts the claw portion 3312, and the sliding rod 320 will make the claw portion 3312 withdraw from the limiting cavity 314, thereby releasing the fixing and restraining effect of the entire claw 330 on the stent graft 20, and finally releasing the stent graft 20.

[0100] The conveying device 300 may further include a guide wire head 340 , which may be disposed at the distal end of the conveying body 311 to block the sliding cavity 3111 of the conveying body 311 . The guide wire may be passed through the sliding rod 320 , the claw 330 and the guide wire head 340 .

[0101] Fourth Embodiment

[0102] The main differences between the conveying device 400 provided in the third embodiment and the conveying device 100 provided in the first embodiment lie in the structure of the clamping jaw 430, the connection relationship, and the communication structure 413.

[0103] Refer to Figure 18 , Figure 19 , Figure 20 and Figure 21 , the conveying device 400 includes a conveying rod 410, a sliding rod 420, and a clamping jaw 430. The conveying rod 410 is provided with a sliding cavity 4111 and a communication structure 413. The communication structure 413 communicates the outside and the sliding cavity 4111. The conveying rod 410 is used to be inserted into the covered stent 20, so that the distal end of the covered stent 20 is sleeved on the conveying rod 410. The sliding cavity 4111 extends along the axial direction of the conveying rod 410, and the sliding rod 420 is slidably matched with the sliding cavity 4111, so that the sliding rod 420 can slide relative to the conveying rod 410 along the axial direction of the conveying rod 410.

[0104] The conveying rod 410 includes a conveying main body 411 and an outer sleeve 412. The outer sleeve 412 is sleeved outside the conveying main body 411, so that a part of the outer sleeve 412 is fixedly connected to the conveying main body 411, and another part of the outer sleeve 412 is arranged around the conveying main body 411, so that an annular limiting cavity 414 is formed between the outer sleeve 412 and the conveying main body 411. Along the axial direction of the conveying rod 410, the distal end of the limiting cavity 414 is closed and the proximal end is not closed, so that the opening of the limiting cavity 414 faces the proximal end of the conveying main body 411. The sliding cavity 4111 is arranged on the conveying main body 411, and the limiting cavity 414 is communicated with the sliding cavity 4111 through the communication structure 413. A part of the covered stent 20 near the distal end can be received in the limiting cavity 414. Through the limiting effect of the limiting cavity 414, the fixing effect of the distal end of the covered stent 20 can be enhanced to a certain extent.

[0105] From the distal end to the proximal end of the conveying main body 411, the width of the limiting cavity 414 can remain constant or increase. When the width of the limiting cavity 414 remains constant, the inner surface of the outer sleeve 412 and the outer surface of the conveying main body 411 both extend along the axial direction of the conveying main body 411, which can be understood as the inner surface of the outer sleeve 412 and the outer surface of the conveying main body 411 are arranged in parallel; when the width of the limiting cavity 414 increases, the inner surface of the outer sleeve 412 extends in a direction forming an angle with the axial direction of the conveying main body 411, while the outer surface of the conveying main body 411 extends along the axial direction of the conveying main body 411, which can be understood as the inner surface of the outer sleeve 412 and the outer surface of the conveying main body 411 intersect. When the width of the limiting cavity 414 gradually increases, the release resistance of the covered stent 20 can be reduced to a certain extent, and the release efficiency of the covered stent 20 can be improved.

[0106] Refer to Figure 20 , Figure 21and Figure 22 Moreover, the conveying rod 410 may further include a convex ring 415. The convex ring 415 is connected to the conveying main body 411 and is located in the sliding cavity 4111. The convex ring 415 protrudes a certain length along the radial direction of the conveying main body 411 relative to the inner wall surface of the sliding cavity 4111. The communication structure 413 may include a plurality of sliding grooves 4131. The plurality of sliding grooves 4131 are all arranged on the conveying main body 411, and the plurality of sliding grooves 4131 are arranged at intervals along the circumferential direction of the conveying main body 411. The sliding grooves 4131 connect the communication limiting cavity 414 and the sliding cavity 4111. The sliding grooves 4131 extend a certain length along the axial direction of the conveying main body 411. The convex ring 415 may be closer to the proximal end of the conveying rod 410 relative to the sliding grooves 4131.

[0107] The clamping jaw 430 is fixedly connected to the sliding rod 420, that is, the clamping jaw 430 can slide relative to the conveying rod 410 following the sliding rod 420. The number of the clamping jaw units 431 is equal to the number of the sliding grooves 4131 to form a one-to-one correspondence. The clamping jaw units 431 protrude along the axial direction of the sliding rod 420 at the distal end of the sliding rod 420, and the plurality of clamping jaw units 431 are arranged at intervals along the circumferential direction of the sliding rod 420.

[0108] The clamping jaw unit 431 may include an elastic part 4311 and a clamping jaw part 4312. The proximal end of the elastic part 4311 is connected to the sliding rod 420, and the clamping jaw part 4312 is connected to the proximal end of the elastic part 4311 at an angle, so that the clamping jaw part 4312 is arranged farther away from the central axis of the conveying rod 410 relative to the elastic part 4311, so that the whole clamping jaw unit 431 is in a bent state. When the clamping jaw unit 431 is in the natural state, pointing from the proximal end to the distal end of the elastic part 4311, the distance from the elastic part 4311 to the central axis of the conveying rod 410 may gradually increase, so that the elastic part 4311 is arranged at an angle with the axial direction of the conveying rod 410, or it can be generally understood that the elastic part 4311 is inclined relative to the axial direction of the conveying rod 410. The elastic part 4311 has a certain elastic force. When an extrusion force towards the central axis of the conveying rod 410 is applied to the elastic part 4311, the elastic part 4311 can overcome its own elastic force and gradually move closer to the central axis of the conveying rod 410, so that the angle between the elastic part 4311 and the axial direction of the conveying rod 410 decreases. In the natural state, all the elastic parts 4311 can be regarded as a frustum-like cone. The outer diameter of the proximal end of the frustum-like cone is the smallest and can be approximately equal to the inner diameter of the convex ring 415, while the outer diameters of other parts of the frustum-like cone are all larger than the inner diameter of the convex ring 415. The convex ring 415 can be sleeved on the frustum-like cone, that is, the convex ring 415 surrounds the frustum-like cone.

[0109] When the convex ring 415 is sleeved on the proximal end of the frustum-like body, the elastic portion 4311 is in a natural state, and the claw portion 4312 extends into the limiting cavity 414 through the slide groove 4131 in turn, so that the claw portion 4312 forms a hanging effect with the wave ring at the distal end of the coating bracket 20, so that the distal end of the coating bracket 20 is in a fixed state.

[0110] When the sliding rod 420 slides in the sliding cavity 4111 and the convex ring 415 gradually moves closer to the distal end of the frustum-like body, the claw portion 4312 slides in the sliding groove 4131 close to the proximal end of the sliding groove 4131, and the sliding rod 420 will overcome the elastic force of the elastic portion 4311 and apply an extrusion force to the elastic portion 4311 toward the central axis of the conveying rod 410, so that the elastic portion 4311 swings close to the central axis of the conveying rod 410, and then the convex ring 415 produces a radial compression effect on the frustum-like body. During the swinging of the elastic part 4311 close to the central axis of the conveying rod 410, the elastic part 4311 will drive the claw part 4312 to gradually withdraw from the slide groove 4131, and then the claw part 4312 will completely withdraw from the limiting cavity 414 and release the hanging relationship formed with the wave ring at the far end of the coating bracket 20, thereby releasing the fixing and restraining effect of the entire claw 430 on the coating bracket 20, thereby facilitating the release of the coating bracket 20.

[0111] Therefore, when the claw 430 is needed to fix the distal end of the coated stent 20 so that the coated stent 20 forms a semi-released state to block the blood, the sliding rod 420 can slide relative to the sliding cavity 4111, so that the convex ring 415 is sleeved on the proximal end of the frustum-like body, and the claw unit 431 will be in a natural state, so that the claw portion 4312 extends into the limiting cavity 414 through the sliding groove 4131 to engage the wave ring at the distal end of the coated stent 20, thereby finally achieving the fixation of the distal end of the coated stent 20. When it is necessary to completely release the coated stent 20, the sliding rod 420 can be made to slide relative to the sliding cavity 4111, so that the convex ring 415 gradually moves closer to the distal end of the frustum-like body, and then the convex ring 415 produces a radial compression effect on the frustum-like body, and the claw portion 4312 will completely withdraw from the limiting cavity 414 and release the hanging relationship formed between the wave circle at the distal end of the coated stent 20, thereby releasing the fixing and restraining effect of the entire claw 430 on the coated stent 20, and finally achieving the release of the coated stent 20.

[0112] The conveying device 400 may further include a guide wire head 440 , which may be disposed at the distal end of the conveying body 411 to block the sliding cavity 4111 of the conveying body 411 , and the guide wire may be passed through the sliding rod 420 , the claw 430 and the guide wire head 440 .

[0113] Fifth Embodiment

[0114] The main difference between the conveying device 500 provided in the fifth embodiment and the conveying device 400 provided in the fourth embodiment lies in the structure of the conveying rod 510.

[0115] Referring to Figure 23 , Figure 24 , Figure 25 and Figure 26 , the conveying device 500 includes a conveying rod 510, a sliding rod 520 and a claw 530. The conveying rod 510 is provided with a sliding cavity 5111 and a communication structure 513. The communication structure 513 communicates the outside and the sliding cavity 5111. The conveying rod 510 is used to be inserted into the covered stent 20 so that the distal end of the covered stent 20 is sleeved on the conveying rod 510. The sliding cavity 5111 extends along the axial direction of the conveying rod 510, and the sliding rod 520 is slidably matched with the sliding cavity 5111, so that the sliding rod 520 can slide relative to the conveying rod 510 along the axial direction of the conveying rod 510.

[0116] The conveying rod 510 includes a conveying main body 511 and an outer sleeve 512. The outer sleeve 512 is sleeved outside the conveying main body 511, so that a part of the outer sleeve 512 is fixedly connected to the conveying main body 511, and another part of the outer sleeve 512 surrounds the conveying main body 511, so that an annular limiting cavity 514 is formed between the outer sleeve 512 and the conveying main body 511. Along the axial direction of the conveying rod 510, the distal end of the limiting cavity 514 is closed and the proximal end is not closed, so that the opening of the limiting cavity 514 faces the proximal end of the conveying main body 511. The sliding cavity 5111 is arranged on the conveying main body 511, and the limiting cavity 514 is communicated with the sliding cavity 5111 through the communication structure 513. A part of the covered stent 20 near the distal end can be received in the limiting cavity 514. Through the limiting effect of the limiting cavity 514, the fixing effect of the distal end of the covered stent 20 can be enhanced to a certain extent.

[0117] From the distal end to the proximal end of the conveying main body 511, the width of the limiting cavity 514 can remain constant or increase. Referring to Figure 27 , when the width of the limiting cavity 514 remains constant, the inner surface of the outer sleeve 512 and the outer surface of the conveying main body 511 both extend along the axial direction of the conveying main body 511, which can be understood as that the inner surface of the outer sleeve 512 and the outer surface of the conveying main body 511 are arranged in parallel; referring to Figure 28 , when the width of the limiting cavity 514 increases, the inner surface of the outer sleeve 512 extends in a direction forming an angle with the axial direction of the conveying main body 511, while the outer surface of the conveying main body 511 extends along the axial direction of the conveying main body 511, which can be understood as that the inner surface of the outer sleeve 512 and the outer surface of the conveying main body 511 intersect. When the width of the limiting cavity 514 gradually increases, the release resistance of the covered stent 20 can be reduced to a certain extent, and the release efficiency of the covered stent 20 can be improved.

[0118] The conveying rod 510 may further include an inner sleeve 515. The inner sleeve 515 is connected to the conveying main body 511 and is located within the sliding cavity 5111. A guiding cavity 5151 is formed between the inner sleeve 515 and the conveying main body 511. The communicating structure 513 may include a plurality of sliding grooves 5131. The number of the sliding grooves 5131 is multiple. The multiple sliding grooves 5131 are all provided on the conveying main body 511, and the multiple sliding grooves 5131 are arranged at intervals along the circumferential direction of the conveying main body 511. The sliding grooves 5131 connect the communicating limiting cavity 514 and the guiding cavity 5151. The sliding grooves 5131 extend a certain length along the axial direction of the conveying main body 511. Pointing from the distal end to the proximal end of the conveying rod 510, the cross-sectional dimension of the inner sleeve 515 gradually decreases, so that the inner sleeve 515 has a conical structure. When the cross-sectional dimension of the sliding cavity 5111 remains unchanged, the width of the guiding cavity 5151 can be gradually increased.

[0119] The claw 530 is fixedly connected to the sliding rod 520, that is, the claw 530 can slide relative to the conveying rod 510 following the sliding rod 520. The number of the claw units 530 is equal to the number of the sliding grooves 5131 and forms a one-to-one correspondence. The claw units 530 protrude along the axial direction of the sliding rod 520 at the distal end of the sliding rod 520, and the multiple claw units 530 are arranged at intervals along the circumferential direction of the sliding rod 520.

[0120] The claw unit 530 may include an elastic part 5311 and a claw part 5312. The proximal end of the elastic part 5311 is connected to the sliding rod 520. The claw part 5312 is connected to the proximal end of the elastic part 5311 at an angle, so that the claw part 5312 is arranged farther away from the central axis of the conveying rod 510 relative to the elastic part 5311, so that the whole claw unit 530 is in a bent state. When the claw unit 530 is in a natural state, the elastic part 5311 can extend along the axial direction of the conveying rod 510. The elastic part 5311 has a certain elasticity. When an extrusion force is applied to the elastic part 5311 in the direction away from the central axis of the conveying rod 510, the elastic part 5311 can overcome its own elastic force and gradually move away from the central axis of the conveying rod 510, so that an angle is formed between the elastic part 5311 and the axial direction of the conveying rod 510. In the natural state, all the elastic parts 5311 can be regarded as a kind of cylinder. The cavity surrounded by the cylinder is denoted as an expansion cavity. The minimum cross-sectional dimension of the inner sleeve 515 can be greater than or equal to the cross-sectional dimension of the expansion cavity. It can be understood that the minimum outer diameter of the inner sleeve 515 is greater than or equal to the inner diameter of the expansion cavity. When the elastic part 5311 is received in the guiding cavity 5151 and the inner sleeve 515 is inserted into the expansion cavity, the inner sleeve 515 will form an interference fit relationship with the expansion cavity, so that the inner sleeve 515 applies an extrusion force to the elastic part 5311 in the direction away from the central axis of the conveying rod 510, so that the elastic part 5311 overcomes its own elastic force and gradually moves away from the central axis of the conveying rod 510.

[0121] When the slide rod 520 moves close to the distal end of the conveying rod 510 and causes the claw portion 5312 to move close to the distal end of the guide groove, the elastic portion 5311 is accommodated in the guide cavity 5151, and the conical inner sleeve 515 is gradually inserted into the expansion cavity, so that the inner sleeve 515 gradually moves close to the distal end of the slide rod 520. In this way, the inner sleeve 515 applies an extrusion force to the expansion cavity in the direction away from the central axis of the delivery rod 510, that is, applies an expansion force, so that the elastic part 5311 overcomes its own elastic force and gradually moves away from the central axis of the delivery rod 510, and the elastic part 5311 will drive the claw part 5312 to move away from the central axis of the delivery rod 510, and the angle between the extension direction of the elastic part 5311 and the central axis of the delivery rod 510 gradually increases, and the claw part 5312 will gradually extend into the slide groove 5131 and the limiting cavity 514, and the claw part 5312 will form a hanging effect with the wave ring at the distal end of the coating support 20, so that the distal end of the coating support 20 is in a fixed state.

[0122] When the sliding rod 520 moves away from the distal end of the delivery rod 510 and the claw portion 5312 moves closer to the proximal end of the guide groove, the inner sleeve 515 can be completely separated from the expansion cavity, the claw 530 is in a natural state, and the elastic portion 5311 recovers to extend axially along the delivery rod 510, so that the claw portion 5312 is located outside the limiting cavity 514. The claw portion 5312 will not be able to form a hanging relationship with the wave ring at the distal end of the coated stent 20. This will eliminate the fixing and restraining effect of the entire claw 530 on the coated stent 20, thereby facilitating the release of the coated stent 20.

[0123] Therefore, when the claw 530 is needed to fix the distal end of the stent graft 20 so that the stent graft 20 forms a semi-released state to block the blood, the inner sleeve 515 can be gradually inserted into the expansion cavity, so that the claw portion 5312 extends into the limiting cavity 514 to form a hanging relationship with the wave ring at the distal end of the stent graft 20, and finally fix the distal end of the stent graft 20. When the stent graft 20 needs to be completely released, the inner sleeve 515 can be completely withdrawn from the expansion cavity, and under the action of the elastic force of the elastic portion 5311 itself, the elastic portion 5311 will return to the natural state, so that the claw portion 5312 withdraws from the limiting cavity 514 and releases the restraining effect on the stent graft 20, and finally the stent graft 20 is completely released.

[0124] The conveying device 500 may further include a guide wire head 540 , which may be disposed at the distal end of the conveying body 511 to block the sliding cavity 5111 of the conveying body 511 . The guide wire may be passed through the sliding rod 520 , the claw 530 and the guide wire head 540 .

[0125] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0126] The above-described embodiments merely represent several implementation manners of the present application. The description thereof is relatively specific and detailed, but it should not be construed as a limitation to the scope of the patent application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can still be made, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the appended claims.

Claims

1. A conveying device, characterized in that, it comprises: a conveying rod, which is provided with a sliding cavity and a communication structure, the communication structure communicates the sliding cavity with the outside, and the conveying rod is used to penetrate through a film covering bracket; a sliding rod, which is slidably matched with the sliding cavity; and a claw, which is fixed on one of the conveying rod and the sliding rod and can slide relative to the other, and the claw can extend into or withdraw from the communication structure in the sliding cavity to fix the film covering bracket on the conveying device or release the film covering bracket from the conveying device.

2. The conveying device according to claim 1, characterized in that, the claw comprises a claw unit, the claw unit can extend into / withdraw from the communication structure under its own elastic force, when the claw unit extends into the communication structure, it can hook with the distal end of the film covering bracket to fix the film covering bracket on the conveying device, and when the claw unit withdraws from the communication structure, it disengages from the distal end of the film covering bracket to release the film covering bracket from the conveying device.

3. The conveying device according to claim 2, characterized in that, the claw unit is fixedly connected to the conveying rod, the claw unit can extend into the communication structure under the action of elastic force, and the sliding rod can drive the claw unit to withdraw from the communication structure; or, the claw unit can withdraw from the communication structure under the action of elastic force, and the sliding rod can drive the claw unit to extend into the communication structure.

4. The conveying device according to claim 3, characterized in that, the communication structure comprises a plurality of through holes arranged at intervals along the circumferential direction of the conveying rod, the claw further comprises a guiding part, the guiding part is fixed in the sliding cavity and is closer to the proximal end of the conveying rod relative to the through holes, the claw units are arranged at intervals along the circumferential direction of the guiding part on the distal side of the guiding part, the sliding rod can be slidably sleeved outside the guiding part and the claw units, and the sliding rod can apply a squeezing force towards the central axis of the conveying rod to the claw units.

5. The conveying device according to claim 4, characterized in that, the claw unit comprises an elastic part and a claw part, the proximal side of the elastic part is connected to the guiding part, the claw part is connected to the distal end of the elastic part at an angle, and the claw part can cooperate with the through hole; in the natural state, from the proximal end to the distal end of the elastic part, the distance from the elastic part to the central axis of the conveying rod gradually increases.

6. The conveying device according to claim 3, characterized in that, the communication structure comprises a plurality of through holes arranged at intervals along the circumferential direction of the conveying rod, the claw further comprises a fixing part, the fixing part is fixed in the sliding cavity and is closer to the distal end of the conveying rod relative to the through holes, a plurality of the claw units are arranged at intervals along the circumferential direction of the fixing part on the proximal side of the fixing part, the sliding rod can be inserted into the expansion cavity surrounded by all the claw units and apply a squeezing force away from the central axis of the conveying rod to the claw units.

7. The conveying device according to claim 6, characterized in that, The jaw unit includes an elastic part and a jaw part. The distal end of the elastic part is connected to the fixed part, and the jaw part is connected to the proximal end of the elastic part at an angle. In the natural state, the elastic part extends along the axial direction of the conveying rod so that the jaw part can withdraw from the through hole.

8. The conveying device according to claim 7, wherein, the sliding rod includes a tapered part. The distal end of the tapered part is the distal end of the sliding rod. The tapered part can cooperate with the expansion cavity. Pointing from the proximal end to the distal end of the sliding rod, the cross-sectional dimension of the tapered part gradually decreases. In the natural state, the minimum cross-sectional dimension of the tapered part is greater than or equal to the cross-sectional dimension of the expansion cavity.

9. The conveying device according to claim 3, wherein, the communication structure includes a plurality of through holes arranged at intervals along the circumferential direction of the conveying rod. A guide groove extending a set length along the axial direction of the sliding rod is formed on the sliding rod. The jaw unit can be inserted into the through hole and slidably cooperate with the guide groove. The jaw further includes a fixed part, which is fixed in the sliding cavity and is closer to the distal end of the conveying rod relative to the through hole. A plurality of the jaw units are arranged at intervals along the circumferential direction of the fixed part at the proximal end of the fixed part. The sliding rod can surround the jaw unit and apply a squeezing force towards the central axis of the conveying rod to the jaw unit.

10. The conveying device according to claim 9, wherein, the jaw unit includes an elastic part and a jaw part. The distal end of the elastic part is connected to the fixed part and can be located inside the sliding rod. The jaw part is connected to the proximal end of the elastic part at an angle. In the natural state, pointing from the distal end to the proximal end of the elastic part, the distance from the elastic part to the central axis of the conveying rod gradually increases.

11. The conveying device according to claim 2, wherein, the jaw unit is fixedly connected to the sliding rod. The jaw unit can extend into the communication structure under the action of elastic force, and the conveying rod can drive the jaw unit to withdraw from the communication structure; or, the jaw unit can withdraw from the communication structure under the action of elastic force, and the conveying rod can drive the jaw unit to extend into the communication structure.

12. The conveying device according to claim 11, wherein, the communication structure includes a plurality of chutes arranged at intervals along the circumferential direction of the conveying rod. The chutes extend a set length along the axial direction of the conveying rod. The conveying rod further includes a convex ring protruding from the inner wall surface of the sliding cavity. The convex ring is closer to the proximal end of the conveying rod relative to the chutes. The jaw units are arranged at intervals along the circumferential direction of the sliding rod at the distal end of the sliding rod. The convex ring can surround the jaw units and apply a squeezing force towards the central axis of the conveying rod to the jaw units.

13. The conveying device according to claim 12, wherein, The jaw unit includes an elastic part and a jaw part. The proximal side of the elastic part is connected to the sliding rod. The jaw part is connected to the distal end of the elastic part at an angle. The jaw part can be slidably engaged with the chute. In the natural state, when pointing from the proximal end to the distal end of the elastic part, the distance from the elastic part to the central axis of the conveying rod gradually increases.

14. The conveying device according to claim 11, wherein, the communication structure includes a plurality of chutes arranged at intervals along the circumferential direction of the conveying rod. The chutes extend along the axial direction of the conveying rod for a set length. The conveying rod includes a conveying main body and an inner sleeve. The sliding cavity is formed in the conveying main body. The inner sleeve is connected to the conveying main body and is located in the sliding cavity. A guiding cavity communicating with the chutes is formed between the inner sleeve and the conveying main body. The jaw unit can be received in the guiding cavity. The inner sleeve can apply a squeezing force to the jaw unit in a direction away from the central axis of the conveying rod.

15. The conveying device according to claim 14, wherein, the jaw unit includes an elastic part and a jaw part. The proximal end of the elastic part is connected to the sliding rod. The jaw part is connected to the distal end of the elastic part at an angle and can be slidably engaged with the chute. The elastic part can be received in the guiding cavity. When pointing from the distal end to the proximal end of the conveying rod, the cross-sectional dimension of the inner sleeve gradually decreases so that the width of the guiding cavity gradually increases. In the natural state, the elastic part extends along the axial direction of the conveying rod so that the jaw part withdraws from the chute.

16. The conveying device according to claim 1, wherein, the conveying rod includes a conveying main body and an outer sleeve. The outer sleeve is sleeved outside the conveying main body and a limiting cavity is formed between the outer sleeve and the conveying main body. The opening of the limiting cavity faces the proximal end of the conveying main body, and the limiting cavity communicates with the communication structure.

17. The conveying device according to claim 16, wherein, when pointing from the distal end to the proximal end of the conveying main body, the width of the limiting cavity remains constant or gradually increases.

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