Conveying device

Abstract

The application relates to a delivery device. The device comprises a delivery rod, a sliding cavity and a communication structure, the communication structure is communicated with the sliding cavity and the outside, and the delivery rod is used for penetrating in a covered stent; a sliding rod is slidably matched with the sliding cavity; and a claw is fixed on one of the delivery rod and the sliding rod and can relatively slide with the other one, the claw can extend into or exit the communication structure in the sliding cavity to fix or release the covered stent. Since the claw can fix the distal end of the covered stent, when other parts of the covered stent are in a released state and are attached to the inner wall of a blood vessel, the covered stent is in a semi-released state, the blood blocking function can be realized through the cooperation of the delivery device and the covered stent in the semi-released state, and the blood can be effectively prevented from entering into the covered stent from the distal end. Therefore, the safety and work efficiency of the operation can be improved.

Description

Technical Field

[0001] This application relates to the field of medical device technology, and in particular to a delivery device. Background Technology

[0002] Delivery devices are commonly used to implant covered stents into the body for the treatment of conditions such as thoracic aortic diseases. For traditional delivery devices, during surgery, in order to block blood flow before releasing stents to the brachiocephalic trunk, left common carotid artery, and left subclavian artery branches, refer to... Figure 1 and Figure 2 The procedure typically involves clamping the aorta with a depressor or occluding it with a balloon. However, using a clamp increases mechanical trauma to the blood vessel, and using a balloon increases the opening of the iliac aorta, both of which affect the safety and efficiency of the procedure. Summary of the Invention

[0003] One of the technical problems addressed by this application is how to improve surgical efficiency and safety.

[0004] A conveying device, comprising:

[0005] The conveying rod has a sliding cavity and a connecting structure, the connecting structure connecting the sliding cavity to the outside, and the conveying rod is used to pass through the film-coating bracket;

[0006] The slide rod is slidably engaged with the sliding cavity; and

[0007] A claw, fixed to one of the conveying rod and the slide rod and capable of relative sliding with the other, is capable of extending into or retracting from the communicating structure in the sliding cavity to fix the film-coated bracket to the conveying device or release the film-coated bracket from the conveying device.

[0008] In one embodiment, the claw includes a claw unit that can extend into / retract from the connecting structure under its own elastic force. When the claw unit extends into the connecting structure, it can hook onto the distal end of the film-coated bracket to fix the film-coated bracket on the conveying device. When the claw unit retracts from the connecting structure, it disengages from the distal end of the film-coated bracket to release the film-coated bracket from the conveying device.

[0009] In one embodiment, the claw unit is fixedly connected to the conveying rod, the claw unit can extend into the communicating structure under the action of elastic force, and the slide rod can drive the claw unit to exit the communicating structure; or, the claw unit can exit the communicating structure under the action of elastic force, and the slide rod can drive the claw unit to extend into the communicating structure.

[0010] In one embodiment, the connecting structure includes a plurality of through holes spaced apart circumferentially along the conveying rod, the claw further includes a guide 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 spaced apart circumferentially along the distal end side of the guide portion, the slide rod is slidably sleeved outside the guide portion and the claw units, and the slide rod is capable of applying a compressive force toward the central axis of the conveying rod to the claw units.

[0011] 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 guide part, and the claw part is connected at an angle to the distal end of the elastic part. The claw part can cooperate with the through hole. In the natural state, the distance from the proximal end of the elastic part to the distal end gradually increases from the proximal end to the central axis of the conveying rod.

[0012] In one embodiment, the connecting structure includes a plurality of through holes spaced apart circumferentially along the conveying rod, and the claws further include a fixing part fixed in the sliding cavity and closer to the distal end of the conveying rod relative to the through holes. A plurality of claw units are spaced apart circumferentially along the fixing part near the fixing part. The slide rod can be inserted into the expansion cavity surrounded by all the claw units and apply a compressive force to the claw units opposite to the central axis of the conveying rod.

[0013] In one embodiment, the claw unit includes an elastic part and a claw part, the distal end of the elastic part is connected to the fixed part, and the claw part is connected at an angle to the proximal end of the elastic part; in the natural state, the elastic part extends along the axial direction of the conveying rod so that the claw part can be disengaged from the through hole.

[0014] In one embodiment, the slide bar includes a tapered portion, the distal end of which is the distal end of the slide bar. The tapered portion is capable of engaging with the expansion cavity, extending from the proximal end to the distal end of the slide bar. The cross-sectional size of the tapered portion gradually decreases, and in its natural state, the minimum cross-sectional size of the tapered portion is greater than or equal to the cross-sectional size of the expansion cavity.

[0015] In one embodiment, the connecting structure includes a plurality of through holes spaced apart circumferentially along the conveying rod, and a guide groove extending a predetermined length along the axial direction of the slide rod is provided on the slide rod. The claw unit can pass through the through holes and slide in cooperation with the guide groove. The claw also includes a fixing part, which is fixed in the sliding cavity and is closer to the distal end of the conveying rod than the through holes. The plurality of claw units are spaced apart circumferentially along the fixing part near the fixing part. The slide rod can be arranged around the claw unit and apply a compressive force toward the central axis of the conveying rod to the claw unit.

[0016] In one embodiment, the claw unit includes an elastic part and a claw part. The distal end of the elastic part is connected to the fixed part and can be located inside the slide bar. The claw part is connected at an angle to the proximal end of the elastic part. In the natural state, the distance from the elastic part to the central axis of the conveying rod gradually increases from the distal end to the proximal end of the elastic part.

[0017] In one embodiment, the claw unit is fixedly connected to the slide rod, the claw unit can extend into the communicating structure under the action of elastic force, and the conveying rod can drive the claw unit to exit the communicating structure; or, the claw unit can exit the communicating structure under the action of elastic force, and the conveying rod can drive the claw unit to extend into the communicating structure.

[0018] In one embodiment, the connecting structure includes a plurality of grooves spaced apart circumferentially along the conveying rod, the grooves extending a predetermined length axially along the conveying rod, the conveying rod further including a protruding ring protruding from the inner wall of the sliding cavity, the protruding ring being closer to the proximal end of the conveying rod relative to the grooves, the claw units spaced apart circumferentially along the distal end of the slide rod, the protruding rings being able to surround the claw units and apply a compressive force toward the central axis of the conveying rod to the claw units.

[0019] 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 slide rod, and the claw part is connected at an angle to the distal end of the elastic part. The claw part can slide and engage with the slide groove. In the natural state, the distance from the proximal end of the elastic part to the distal end gradually increases from the proximal end to the central axis of the conveying rod.

[0020] In one embodiment, the connecting structure includes a plurality of grooves spaced apart circumferentially along the conveying rod, the grooves extending a predetermined length axially along the conveying rod, the conveying rod including a conveying body and an inner sleeve, the sliding cavity being formed in the conveying body, the inner sleeve being connected to the conveying body and located within the sliding cavity, a guide cavity communicating with the grooves being formed between the inner sleeve and the conveying body, the claw unit being accommodated in the guide cavity, and the inner sleeve being able to apply a compressive force to the claw unit opposite to 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 slide rod, and the claw part is connected at an angle to the distal end of the elastic part and can slide with the slide groove. The elastic part can be accommodated in the guide 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 guide cavity gradually increases. In the natural state, the elastic part extends along the axial direction of the conveying rod to disengage the claw part from the slide groove.

[0022] In one embodiment, the conveying rod includes a conveying body and an outer sleeve, the outer sleeve being fitted outside the conveying body and forming a limiting cavity between the outer sleeve and the conveying body, the opening of the limiting cavity facing the proximal end of the conveying body, and the limiting cavity communicating with the communicating structure.

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

[0024] One technical advantage of one embodiment of this application is that, given that the clasps can fix the distal end of the covered stent, and when the other parts of the covered stent are in a released state and adhere to the inner wall of the blood vessel, the covered stent is in a semi-released state. Therefore, through the combined action of the delivery device and the semi-released covered stent, a blood barrier function can be achieved, effectively preventing blood from entering the covered stent from the distal end. This reduces the trauma to the human body caused by other auxiliary instruments, thereby improving the safety of the surgery. Furthermore, it eliminates the need to operate other auxiliary instruments; only the delivery device itself needs to be operated, reducing surgical time and improving surgical efficiency. When it is necessary to release the covered stent, the clasps simply release the covered stent. Attached Figure Description

[0025] Figure 1 This is a schematic diagram illustrating the use of clamps to hold blood vessels in order to achieve blood flow obstruction.

[0026] Figure 2 This is a schematic diagram illustrating the use of balloon occlusion to block blood flow.

[0027] Figure 3 This is a schematic diagram illustrating the use of a delivery device in conjunction with a covered stent in a semi-released state to achieve blood flow barrier.

[0028] Figure 4 A three-dimensional structural schematic diagram of the conveying device provided in the first embodiment.

[0029] Figure 5 for Figure 4 The exploded view of the conveying device is shown.

[0030] Figure 6 for Figure 4 The diagram shows a planar cross-sectional view of the assembled conveying device.

[0031] Figure 7 for Figure 4 The diagram shows a planar cross-sectional view of the disassembled conveying device.

[0032] Figure 8 for Figure 4 A three-dimensional sectional view of the conveyor rod in the conveying device shown.

[0033] Figure 9 for Figure 4 A three-dimensional structural diagram of the gripper in the conveying device shown.

[0034] Figure 10 for Figure 9 The diagram shows a three-dimensional cross-sectional view of the chuck.

[0035] Figure 11 A three-dimensional structural schematic diagram of the conveying device provided in the second embodiment.

[0036] Figure 12 for Figure 11 A three-dimensional structural diagram of the gripper in the conveying device shown.

[0037] Figure 13 for Figure 11 The diagram shows a planar cross-sectional view of the assembled conveying device.

[0038] Figure 14 for Figure 11 The diagram shows a planar cross-sectional view of the disassembled conveying device.

[0039] Figure 15 An exploded view of the conveying device provided for the third embodiment.

[0040] Figure 16 for Figure 15 The diagram shows a planar cross-sectional view of the assembled conveying device.

[0041] Figure 17 for Figure 15 The diagram shows a planar cross-sectional view of the disassembled conveying device.

[0042] Figure 18 An exploded view of the conveying device provided for the fourth embodiment.

[0043] Figure 19 for Figure 18 The exploded view of the conveying device is shown.

[0044] Figure 20 for Figure 18 The diagram shows a planar cross-sectional view of the assembled conveying device.

[0045] Figure 21 for Figure 18 The diagram shows a planar cross-sectional view of the disassembled conveying device.

[0046] Figure 22 for Figure 18 A three-dimensional sectional view of the conveyor rod in the conveying device shown.

[0047] Figure 23 An exploded view of the conveying device provided for the fifth embodiment.

[0048] Figure 24 The exploded structural diagram of the conveying device shown in body 23 is shown.

[0049] Figure 25 for Figure 23 The diagram shows a planar cross-sectional view of the assembled conveying device.

[0050] Figure 26 for Figure 23 The diagram shows a planar cross-sectional view of the disassembled conveying device.

[0051] Figure 27 for Figure 23 A three-dimensional cross-sectional view of the first example conveyor rod in the conveying device shown.

[0052] Figure 28 for Figure 23 A three-dimensional cross-sectional view of the second example conveying rod in the conveying device shown. Detailed Implementation

[0053] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0054] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0055] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0056] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0057] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply 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 being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening 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 intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0059] In this application, the end of each component closer to the operator is referred to as the "proximal end", and the end farther from the operator is referred to as the "remote end".

[0060] See Figure 4 , Figure 5 , Figure 6 and Figure 7 The delivery device 100 provided in this application can be used to implant a covered stent 20 into a predetermined location, such as the thoracic aorta, for the treatment of disease. The delivery device 100 includes a delivery rod 110, a slide bar 120, and a claw 130. The delivery rod 110 has a sliding cavity 1111 and a connecting structure 113. The connecting structure 113 connects the outside to the sliding cavity 1111. The delivery rod 110 is inserted into the covered stent 20, such that the distal end of the covered stent 20 is fitted onto the delivery rod 110. The sliding cavity 1111 extends axially along the delivery rod 110. The slide bar 120 slides within the sliding cavity 1111, allowing the slide bar 120 to slide relative to the delivery rod 110 along the axial direction of the delivery rod 110. The claw 130 is fixedly connected to one of the delivery rod 110 and the slide bar 120 and can slide relative to the other. When the claw 130 extends from the sliding cavity 1111 into the connecting structure 113, it can extend further out of the connecting structure 113 to secure the distal end of the coating support 20. When the claw 130 retracts from the connecting structure 113, the fixing and restraining effect of the claw 130 on the coating support 20 can be released, allowing the coating support 20 to unfold and anchor in a designated position. For example, the claw 130 includes a claw unit that can extend into / retract from the connecting structure under its own elastic force. When the claw unit extends into the connecting structure, it can hook onto the distal end of the coating support to secure the coating support to the conveying device. When the claw unit retracts from the connecting structure, it disengages from the distal end of the coating support to release the coating support from the conveying device.

[0061] During the procedure, to prevent blood from entering the covered stent 20 from the distal end, refer to... Figure 1 If clamp 30 is used to clamp the blood vessel to block blood flow, the squeezing force of clamp 30 will cause mechanical damage to the blood vessel, thus affecting the safety of the surgery. Furthermore, the operation of clamp 30 will also affect the efficiency of the surgery. (See also...) Figure 2If the procedure involves placing an inflatable balloon 40 inside the blood vessel, the expansion force of the inflatable balloon 40 increases the opening of the iliac aorta, which may cause some damage to the blood vessel, thus affecting the safety of the surgery. Furthermore, the inflatable balloon 40 will also affect the efficiency of the surgery.

[0062] See Figure 3 Regarding the delivery device 100 of this application, after the delivery device 100 delivers the covered stent 20 to the set position, the claw 130 extends from the connecting structure 113 to fix the distal end of the covered stent 20, while the other parts of the covered stent 20 are in a released state and adhere to the inner wall of the blood vessel. Since the covered stent 20 is sleeved on the delivery rod 110 and its distal end is fixed, the covered stent 20 can be understood as being in a semi-released state. Through the combined action of the delivery device 100 and the semi-released covered stent 20, a blood barrier function can be achieved, effectively preventing blood from entering the covered stent 20 from the distal end. This eliminates the need for additional devices such as the clamp 30 and the inflatable balloon 40, thus reducing trauma and improving surgical safety. Furthermore, it eliminates the need to operate the clamp 30 and the inflatable balloon 40; only the delivery device 100 itself needs to be operated, reducing surgical time and improving surgical efficiency. When it is necessary to completely release the covered support 20, the claw 130 can be disengaged from the communicating structure 113 to release the fixation of the covered support 20. The conveying device 100 of this application can be configured in at least the following embodiments:

[0063] First Embodiment

[0064] See Figure 4 , Figure 5 , Figure 6 and Figure 7 The conveying device 100 includes a conveying rod 110, a slide bar 120, and a gripper 130. The conveying rod 110 has a sliding cavity 1111 and a connecting structure 113. The connecting structure 113 connects the outside world and the sliding cavity 1111. The conveying rod 110 is used to pass through the film-coating bracket 20, so that the distal end of the film-coating bracket 20 is sleeved on the conveying rod 110. The sliding cavity 1111 extends along the axial direction of the conveying rod 110. The slide bar 120 is slidably engaged with the sliding cavity 1111, so that the slide bar 120 can slide relative to the conveying rod 110 along the axial direction of the conveying rod 110.

[0065] See Figure 6 , Figure 7 and Figure 8The conveying rod 110 includes a conveying body 111 and an outer sleeve 112. The outer sleeve 112 is fitted outside the conveying body 111, with a portion of the outer sleeve 112 fixedly connected to the conveying body 111 and the other portion surrounding the conveying body 111, thus forming an annular limiting cavity 114 between the outer sleeve 112 and the conveying body 111. Along the axial direction of the conveying rod 110, the distal end of the limiting cavity 114 is closed while the proximal end is not closed, so that the opening of the limiting cavity 114 faces the proximal end of the conveying body 111. A sliding cavity 1111 is disposed on the conveying body 111, and the limiting cavity 114 is interconnected with the sliding cavity 1111 through a connecting structure 113. A portion of the coated support 20 near its distal end can be accommodated in the limiting cavity 114. Through the limiting effect of the limiting cavity 114, the fixation effect of the distal end of the coated support 20 can be enhanced to a certain extent.

[0066] See Figure 6 , Figure 7 and Figure 8 The width of the limiting cavity 114 can remain constant or increase from the distal end to the proximal end of the conveying body 111. When the width of the limiting cavity 114 remains constant, both the inner surface of the outer sleeve 112 and the outer surface of the conveying body 111 extend along the axial direction of the conveying body 111, which can be understood as the inner surface of the outer sleeve 112 and the outer surface of the conveying body 111 being parallel. When the width of the limiting cavity 114 increases, the inner surface of the outer sleeve 112 extends at an angle to the axial direction of the conveying body 111, while the outer surface of the conveying body 111 extends along the axial direction of the conveying body 111, which can be understood as the inner surface of the outer sleeve 112 and the outer surface of the conveying body 111 intersecting. As the width of the limiting cavity 114 gradually increases, the release resistance of the covered support 20 can be reduced to a certain extent, thereby improving the release efficiency of the covered support 20.

[0067] See Figure 6 , Figure 7 and Figure 8 The connecting structure 113 may include a through hole 1131. There are multiple through holes 1131. All through holes 1131 are provided on the conveying body 111 and are spaced apart along the circumference of the conveying body 111. The through holes 1131 connect the limiting cavity 114 and the sliding cavity 1111.

[0068] See Figure 6 , Figure 7 , Figure 9 and Figure 10The claw 130 is fixedly connected to the conveying rod 110. The claw 130 may include a guide portion 133, a fixing portion 132, a connecting portion 134, and claw 130 units. The number of claw 130 units is equal to the number of through holes 1131, forming a one-to-one correspondence. The guide portion 133 may be approximately cylindrical in shape and is located within the sliding cavity 1111. The guide portion 133 is closer to the proximal end of the conveying rod 110 than the through holes 1131. The conveying body 111 is arranged around the guide portion 133, resulting in an annular gap between the guide portion 133 and the conveying body 111. The slide rod 120 may be a hollow tubular structure, allowing the guide portion 133 to slide in conjunction with the inner cavity of the slide rod 120. The slide rod 120 slides in conjunction with the annular gap, thereby allowing the slide rod 120 to slide outside the guide portion 133. The fixing part 132 can also be generally cylindrical in shape. The fixing part 132 is located within the sliding cavity 1111 and is fixedly connected to the conveying body 111. For example, the fixing part 132 can be fixed by adhesive bonding or welding. The fixing part 132 and the guide part 133 are spaced apart along the axial direction of the conveying body 111, such that the fixing part 132 is closer to the distal end of the conveying body 111 than the guide part 133. The connecting part 134 can be a strip-shaped structure. The connecting part 134 extends along the axial direction of the conveying body 111. The proximal end of the connecting part 134 is connected to the guide part 133, and the distal end of the connecting part 134 is connected to the fixing part 132, thus connecting the fixing part 132 and the guide part 133. There can be multiple connecting parts 134, which are spaced apart circumferentially along the fixing part 132.

[0069] See Figure 6 , Figure 7 , Figure 9 and Figure 10 The gripper unit 131 protrudes axially along the conveying rod 110 and is disposed at the distal end of the guide portion 133. Multiple gripper units 131 are spaced circumferentially along the guide portion 133, with each gripper unit 131 corresponding to the gap between two adjacent connecting portions 134, allowing the gripper unit 131 to be positioned within the gap between the two adjacent connecting portions 134. When the entire gripper 130 is in its natural state without external force, the multiple gripper units 131 can surround the connecting portion 134. A fixed connection between the gripper 130 and the conveying body 111 is achieved through the fixed connection of the fixing portion 132 and the conveying body 111. Alternatively, the fixing portion 132 can be omitted, allowing the connecting portion 134 to be directly fixed to the conveying body 111; the connecting portion 134 can also be a cylindrical structure.

[0070] See Figure 6 , Figure 7 , Figure 9 and Figure 10The gripper unit 131 may include an elastic part 1311 and a gripper part 1312. The proximal end of the elastic part 1311 is connected to the guide part 133, and the gripper part 1312 is connected at an angle to the distal end of the elastic part 1311, so that the entire gripper unit 131 is in a bent state. When the gripper unit 131 is in its natural state, the distance from the proximal end of the elastic part 1311 to the central axis of the conveyor rod 110 can gradually increase from the distal end, so that the elastic part 1311 is set at an angle to the axial direction of the conveyor rod 110, which can also be understood as the elastic part 1311 being inclined relative to the axial direction of the conveyor rod 110. The elastic part 1311 has a certain elasticity. When a compressive force is applied to the elastic part 1311 toward the central axis of the conveyor rod 110, the elastic part 1311 can overcome its own elasticity and gradually move closer to the central axis of the conveyor rod 110, thereby reducing the angle between the elastic part 1311 and the axial direction of the conveyor rod 110. In its natural state, the entire elastic portion 1311 can be considered as a truncated cone-like body. The outer diameter of the proximal end of this truncated cone-like body is the smallest and can be approximately equal to the inner diameter of the slide rod 120, while the outer diameter of the other parts of this truncated cone-like body can be larger than the inner diameter of the slide rod 120. The slide rod 120 can be fitted onto this truncated cone-like body. Since the claw portion 1312 is connected to the elastic portion 1311 at an angle, the claw portion 1312 can be positioned further away from the central axis of the conveying rod 110 relative to the elastic portion 1311, thereby allowing the claw portion 1312 to engage with the through hole 1131.

[0071] See Figure 6 and Figure 7 When the slide bar 120 is only sleeved outside the guide part 133, and the slide bar 120 is not sleeved on the frustum-like body formed by all the elastic parts 1311, the claw unit 131 is in a natural state. Under the action of elastic force, the elastic part 1311 will drive the claw part 1312 to extend into the through hole 1131, and further extend into the limiting cavity 114 from the through hole 1131, thereby forming a hooking effect with the wave ring at the far end of the film-coated bracket 20, so that the far end of the film-coated bracket 20 is in a fixed state.

[0072] As the slide rod 120 gradually slides toward the through hole 1131, thereby fitting the slide rod 120 onto the frustum-like body formed by all the elastic parts 1311, during the process of the slide rod 120 gradually sliding toward the far end of the frustum-like body, since the inner diameter of the slide rod 120 is smaller than the outer diameter of the frustum-like body, the slide rod 120 will overcome the elastic force of the elastic part 1311 and apply a compressive force toward the central axis of the conveying rod 110 to the elastic part 1311, causing the elastic part 1311 to swing close to the central axis of the conveying rod 110, thereby causing the slide rod 120 to produce a radial compression effect on the frustum-like body. As the elastic part 1311 swings near the central axis of the conveying rod 110, the elastic part 1311 will cause 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 clamping relationship formed with the wave ring at the far end of the film-coated bracket 20. In this way, the fixing and binding effect of the entire claw 130 on the film-coated bracket 20 will be released, thereby facilitating the release of the film-coated bracket 20.

[0073] Therefore, when the clasp 130 needs to fix the distal end of the covered stent 20, thereby placing the covered stent 20 in a semi-released state to block blood flow, the slide bar 120 can be completely disengaged from the elastic portion 1311. When it is necessary to fully release the covered stent 20, the slide bar 120 can be moved gradually closer to the distal end of the frustum-like body formed by all the elastic portions 1311, causing the clasp portion 1312 to completely withdraw from the limiting cavity 114, thereby realizing the release of the covered stent 20.

[0074] The conveying device 100 may also include a guide wire head 140, which may be located at the far end of the conveying body 111 to block the sliding cavity 1111 of the conveying body 111. The guide wire may be inserted into the slide 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 structure of the claw 230 and the slide bar 220.

[0077] See Figure 11 , Figure 12 , Figure 13 and Figure 14The conveying device 200 includes a conveying rod 210, a sliding rod 220, and a gripper 230. The conveying rod 210 has a sliding cavity 2111 and a connecting structure 213. The connecting structure 213 connects the outside world and the sliding cavity 2111. The conveying rod 210 is used to pass through the film-coating bracket 20, so that the distal end of the film-coating bracket 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 slides in conjunction with the sliding cavity 2111, so that the sliding rod 220 can slide relative to the conveying rod 210 along the axial direction of the conveying rod 210.

[0078] See Figure 11 , Figure 12 , Figure 13 and Figure 14 The conveying rod 210 includes a conveying body 211 and an outer sleeve 212. The outer sleeve 212 is fitted outside the conveying body 211, with a portion of the outer sleeve 212 fixedly connected to the conveying body 211 and the other portion surrounding the conveying body 211, thus forming an annular limiting cavity 214 between the outer sleeve 212 and the conveying body 211. Along the axial direction of the conveying rod 210, the distal end of the limiting cavity 214 is closed while the proximal end is not closed, so that the opening of the limiting cavity 214 faces the proximal end of the conveying body 211. A sliding cavity 2111 is provided on the conveying body 211, and the limiting cavity 214 is interconnected with the sliding cavity 2111 through a connecting structure 213. A portion of the coated bracket 20 near its distal end can be accommodated in the limiting cavity 214. Through the limiting effect of the limiting cavity 214, the fixation effect of the distal end of the coated bracket 20 can be enhanced to a certain extent.

[0079] The width of the limiting cavity 214 can remain constant or increase from the distal end to the proximal end of the conveying body 211. When the width of the limiting cavity 214 remains constant, both the inner surface of the outer sleeve 212 and the outer surface of the conveying body 211 extend along the axial direction of the conveying body 211, which can be understood as the inner surface of the outer sleeve 212 and the outer surface of the conveying body 211 being parallel. When the width of the limiting cavity 214 increases, the inner surface of the outer sleeve 212 extends at an angle to the axial direction of the conveying body 211, while the outer surface of the conveying body 211 extends along the axial direction of the conveying body 211, which can be understood as the inner surface of the outer sleeve 212 and the outer surface of the conveying body 211 intersecting. As the width of the limiting cavity 214 gradually increases, the release resistance of the covered support 20 can be reduced to a certain extent, thereby improving the release efficiency of the covered support 20.

[0080] The connecting structure 213 may include a through hole 2131. There are multiple through holes 2131, and all of them are provided on the conveying body 211. The multiple through holes 2131 are arranged at intervals along the circumference of the conveying body 211. The through holes 2131 connect the limiting cavity 214 and the sliding cavity 2111.

[0081] The gripper 230 is fixedly connected to the conveyor rod 210. The gripper 230 includes a fixing part 232 and gripper units 231. The number of gripper units 231 corresponds to the number of through holes 2131. The fixing part 232 can be generally cylindrical in shape. The fixing part 232 is located in the sliding cavity 2111 and is fixedly connected to the conveyor body 211. For example, the fixing part 232 can be fixed by gluing or welding. The gripper units 231 protrude along the axial direction of the conveyor rod 210 and are located near the fixing part 232. Multiple gripper units 231 are spaced apart circumferentially along the fixing part 232. Through the fixed connection between the fixing part 232 and the conveyor body 211, the entire gripper 230 is fixedly connected to the conveyor rod 210.

[0082] The gripper unit 231 may include an elastic part 2311 and a gripper part 2312. The distal end of the elastic part 2311 is connected to the fixed part 232, and the gripper part 2312 is connected to the proximal end of the elastic part 2311 at an angle, so that the entire gripper unit 231 is in a bent state. When the gripper unit 231 is in its natural state, the elastic part 2311 can extend along the axial direction of the conveying rod 210. The elastic part 2311 has a certain elasticity. When a compressive force opposite to the central axis of the conveying rod 210 is applied to the elastic part 2311, the elastic part 2311 can overcome its own elasticity and gradually move away from the central axis of the conveying rod 210, thereby making a certain angle between the elastic part 2311 and the axial direction of the conveying rod 210. In its natural state, the entire elastic part 2311 can be considered as a quasi-cylindrical shape, and the cavity enclosed by the quasi-cylindrical shape is denoted as the expansion cavity 2313. The minimum cross-sectional dimension of the slide rod 220 can be greater than or equal to the cross-sectional dimension of the expansion cavity 2313, which can be understood as the minimum outer diameter of the slide rod 220 being greater than or equal to the inner diameter of the expansion cavity 2313. When the slide rod 220 is inserted into the expansion cavity 2313, the slide rod 220 will form an interference fit with the expansion cavity 2313, so that the slide rod 220 applies a compressive force to the elastic part 2311 away from the central axis of the conveying rod 210, thereby causing the elastic part 2311 to overcome its own elasticity and gradually move away from the central axis of the conveying rod 210.

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

[0084] When the entire slide bar 220 is outside the expansion cavity 2313 of the claw 230, the claw 230 is in its natural state, and the elastic part 2311 extends along the axial direction of the conveying rod 210, so that the claw part 2312 is outside the limiting cavity 214. The claw part 2312 will not be able to form a locking relationship with the wave ring at the far end of the film-coated bracket 20, thus eliminating the fixing and binding effect of the entire claw 230 on the film-coated bracket 20, thereby facilitating the release of the film-coated bracket 20.

[0085] As the slide bar 220 slides relative to the sliding cavity 2111, causing the tapered portion 222 to gradually insert into the expansion cavity 2313, the cross-sectional size of the tapered portion 222 gradually increases from the distal end to the proximal end of the slide bar 220. The tapered portion 222 will expand the expansion cavity 2313, causing the inner diameter of the expansion cavity 2313 to increase. Consequently, the elastic portion 2311 will overcome its own elasticity and move 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 angle between the extension 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 locking action with the wave ring at the distal end of the film-coated bracket 20, so that the distal end of the film-coated bracket 20 is in a fixed state.

[0086] Therefore, when the clasp 230 needs to fix the distal end of the covered stent 20, thereby placing the covered stent 20 in a semi-released state to block blood flow, the tapered portion 222 of the slide bar 220 can be inserted into the expansion cavity 2313 of the clasp 230, allowing the clasp portion 2312 to extend into the limiting cavity 214 to form a locking relationship with the wave coil at the distal end of the covered stent 20, ultimately fixing the distal end of the covered stent 20. When it is necessary to completely release the covered stent 20, the tapered portion 222 of the slide bar 220 can be completely withdrawn from the expansion cavity 2313. Under the action of the elastic portion 2311's own elastic force, the elastic portion 2311 will return to its natural state, allowing the clasp portion 2312 to withdraw from the limiting cavity 214 and releasing the binding effect on the covered stent 20, ultimately achieving the complete release of the covered stent 20.

[0087] The conveying device 200 may also include a guide wire head 240, which may be located at the far end of the conveying body 211 to block the sliding cavity 2111 of the conveying body 211. The guide wire may be inserted into the slide bar 220, the claw 230 and the guide wire head 240.

[0088] Third Embodiment

[0089] The main difference between the conveying device 300 provided in the third embodiment and the conveying device 200 provided in the second embodiment lies in the structure of the claws and the slide bar.

[0090] See Figure 15 , Figure 16 and Figure 17 The conveying device 300 includes a conveying rod 310, a sliding rod 320, and a gripper 330. The conveying rod 310 has a sliding cavity 3111 and an outer sleeve connecting structure 313. The outer sleeve connecting structure 313 connects the outside to the sliding cavity 3111. The conveying rod 310 is used to pass through the film-coating bracket 20, so that the distal end of the film-coating bracket 20 is sleeved on the conveying rod 310. The sliding cavity 3111 extends along the axial direction of the conveying rod 310, and the sliding rod 320 slides in conjunction with the sliding cavity 3111, so that the sliding rod 320 can slide relative to the conveying rod 310 along the axial direction of the conveying rod 310.

[0091] The conveying rod 310 includes a conveying body 311 and an outer sleeve 312. The outer sleeve 312 is fitted outside the conveying body 311, with a portion of the outer sleeve 312 fixedly connected to the conveying body 311 and the other portion surrounding the conveying body 311, thus forming an annular limiting cavity 314 between the outer sleeve 312 and the conveying body 311. Along the axial direction of the conveying rod 310, the distal end of the limiting cavity 314 is closed while the proximal end is not closed, so that the opening of the limiting cavity 314 faces the proximal end of the conveying body 311. A sliding cavity 3111 is disposed on the conveying body 311. The limiting cavity 314 is interconnected with the sliding cavity 3111 through the outer sleeve connecting structure 313. A portion of the coated bracket 20 near its distal end can be accommodated in the limiting cavity 314. Through the limiting effect of the limiting cavity 314, the fixation effect of the distal end of the coated bracket 20 can be enhanced to a certain extent.

[0092] The width of the limiting cavity 314 can remain constant or increase from the distal end to the proximal end of the conveying body 311. When the width of the limiting cavity 314 remains constant, both the inner surface of the outer sleeve 312 and the outer surface of the conveying body 311 extend along the axial direction of the conveying body 311, which can be understood as the inner surface of the outer sleeve 312 and the outer surface of the conveying body 311 being parallel. When the width of the limiting cavity 314 increases, the inner surface of the outer sleeve 312 extends at an angle to the axial direction of the conveying body 311, while the outer surface of the conveying body 311 extends along the axial direction of the conveying body 311, which can be understood as the inner surface of the outer sleeve 312 and the outer surface of the conveying body 311 intersecting. As the width of the limiting cavity 314 gradually increases, the release resistance of the covered support 20 can be reduced to a certain extent, thereby improving the release efficiency of the covered support 20.

[0093] The outer casing connecting structure 313 may include a through hole 3131. There are multiple through holes 3131, and all of them are provided on the conveying body 311. The multiple through holes 3131 are spaced apart along the circumference of the conveying body 311. The through holes 3131 will connect the limiting cavity 314 and the sliding cavity 3111.

[0094] The gripper 330 is fixedly connected to the conveyor rod 310. The gripper 330 includes a fixing part 332 and gripper units 331. The number of gripper 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 shape. The fixing part 332 is located inside the sliding cavity 3111 and is fixedly connected to the conveyor body 311. For example, the fixing part 332 can be fixed by gluing or welding. The gripper units 331 protrude along the axial direction of the conveyor rod 310 and are located near the fixing part 332. Multiple gripper units 331 are spaced apart circumferentially along the fixing part 332. Through the fixed connection between the fixing part 332 and the conveyor body 311, the entire gripper 330 can be fixedly connected to the conveyor rod 310.

[0095] The gripper unit 331 may include an elastic part 3311 and a gripper part 3312. The distal end of the elastic part 3311 is connected to the fixed part 332, and the gripper part 3312 is connected at an angle to the proximal end of the elastic part 3311, so that the entire gripper unit 331 is in a bent state. When the gripper unit 331 is in its natural state, the distance from the distal end of the elastic part 3311 to the central axis of the conveyor rod 310 can gradually increase from the proximal end. This makes the elastic part 3311 and the axial direction of the conveyor rod 310 form an angle, or in simpler terms, the elastic part 3311 is inclined relative to the axial direction of the conveyor rod 310. The elastic part 3311 has a certain elasticity. When a compressive force is applied to the elastic part 3311 toward the central axis of the conveyor rod 310, the elastic part 3311 can overcome its own elasticity and gradually move closer to the central axis of the conveyor rod 310, thereby reducing the angle between the elastic part 3311 and the axial direction of the conveyor rod 310. In its natural state, the entire elastic portion 3311 can be considered as a truncated cone-like body. The outer diameter of the proximal end of this truncated cone-like body is the largest and can be approximately equal to the inner diameter of the slide rod 320, while the outer diameters of the other parts of this truncated cone-like body can be smaller than the inner diameter of the slide rod 320. The slide rod 320 can be fitted onto this truncated cone-like body, that is, the slide rod 320 is arranged around the truncated cone-like body. Since the claw portion 3312 is connected to the elastic portion 3311 at an angle, the claw portion 3312 can be arranged further away from the central axis of the conveying rod 310 relative to the elastic portion 3311.

[0096] The slide bar 320 has guide grooves 321, the number of which corresponds to the number of through holes 3131. Multiple guide grooves 321 are spaced apart circumferentially along the slide bar 320, and extend a certain length axially along the slide bar 320. The claw portion 3312 can slide and engage with the guide grooves 321, extending through the through holes 3131 into the limiting cavity 314.

[0097] When the slide bar 320 is sleeved outside the frustum-like body and the distal end of the guide groove 321 maintains a certain distance from the claw part 3312, the elastic part 3311 is in a natural state, and the claw part 3312 extends into the limiting cavity 314 through the guide groove 321 and the through hole 3131 in sequence, so that the claw part 3312 forms a hooking effect with the wave ring at the distal end of the film-coated bracket 20, so that the distal end of the film-coated bracket 20 is in a fixed state.

[0098] When the slide rod 320 is sleeved outside the frustum-like body and slides relative to the sliding cavity 3111, causing the distal end of the guide groove 321 to contact the claw portion 3312, the slide rod 320 will exert a force on the elastic portion 3311 through the claw portion 3312. The slide rod 320 will overcome the elastic force of the elastic portion 3311 and apply a compressive force towards the central axis of the conveying rod 310 to the elastic portion 3311, causing the elastic portion 3311 to swing close to the central axis of the conveying rod 310, thereby causing the slide rod 320 to produce a radial compression effect on the frustum-like body. As the elastic part 3311 swings near the central axis of the conveying rod 310, the elastic part 3311 will cause 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 clamping relationship formed with the wave ring at the far end of the film-coated bracket 20. In this way, the fixing and binding effect of the entire claw 330 on the film-coated bracket 20 will be released, thereby facilitating the release of the film-coated bracket 20.

[0099] Therefore, when the clasp 330 needs to fix the distal end of the covered stent 20, thereby placing the covered stent 20 in a semi-released state to block blood flow, the slide bar 320 can slide relative to the sliding cavity 3111, maintaining a certain distance between the distal end of the guide groove 321 and the clasp portion 3312. This allows the clasp portion 3312 to extend into the limiting cavity 314 through the guide groove 321 and the through hole 3131 to engage the wave coil at the distal end of the covered stent 20, ultimately fixing the distal end of the covered stent 20. When it is necessary to completely release the covered stent 20, the slide bar 320 can slide relative to the sliding cavity 3111, causing the distal end of the guide groove 321 to contact the clasp portion 3312. The slide bar 320 will then cause the clasp portion 3312 to exit the limiting cavity 314, thereby releasing the fixation and restraint effect of the entire clasp 330 on the covered stent 20, ultimately releasing the covered stent 20.

[0100] The conveying device 300 may also include a guide wire head 340, which may be located at the far end of the conveying body 311 to block the sliding cavity 3111 of the conveying body 311. The guide wire may be inserted into the slide bar 320, the claw 330 and the guide wire head 340.

[0101] Fourth embodiment

[0102] The main difference between the conveying device 400 provided in the third embodiment and the conveying device 100 provided in the first embodiment lies in the structure of the claw 430, the connection relationship, and the connecting structure 413.

[0103] See Figure 18 , Figure 19 , Figure 20 and Figure 21 The conveying device 400 includes a conveying rod 410, a sliding rod 420, and a gripper 430. The conveying rod 410 has a sliding cavity 4111 and a connecting structure 413. The connecting structure 413 connects the outside world and the sliding cavity 4111. The conveying rod 410 is used to pass through the film-coating bracket 20, so that the distal end of the film-coating bracket 20 is sleeved on the conveying rod 410. The sliding cavity 4111 extends along the axial direction of the conveying rod 410. The sliding rod 420 is slidably engaged 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 body 411 and an outer sleeve 412. The outer sleeve 412 is fitted outside the conveying body 411, with a portion of the outer sleeve 412 fixedly connected to the conveying body 411 and the other portion surrounding the conveying body 411, thus forming an annular limiting cavity 414 between the outer sleeve 412 and the conveying body 411. Along the axial direction of the conveying rod 410, the distal end of the limiting cavity 414 is closed while the proximal end is not closed, so that the opening of the limiting cavity 414 faces the proximal end of the conveying body 411. A sliding cavity 4111 is disposed on the conveying body 411. The limiting cavity 414 is interconnected with the sliding cavity 4111 through a connecting structure 413. A portion of the coated bracket 20 near its distal end can be accommodated in the limiting cavity 414. Through the limiting effect of the limiting cavity 414, the fixation effect of the distal end of the coated bracket 20 can be enhanced to a certain extent.

[0105] The width of the limiting cavity 414 can remain constant or increase from the distal end to the proximal end of the conveying body 411. When the width of the limiting cavity 414 remains constant, both the inner surface of the outer sleeve 412 and the outer surface of the conveying body 411 extend along the axial direction of the conveying body 411, which can be understood as the inner surface of the outer sleeve 412 and the outer surface of the conveying body 411 being parallel. When the width of the limiting cavity 414 increases, the inner surface of the outer sleeve 412 extends at an angle to the axial direction of the conveying body 411, while the outer surface of the conveying body 411 extends along the axial direction of the conveying body 411, which can be understood as the inner surface of the outer sleeve 412 and the outer surface of the conveying body 411 intersecting. As the width of the limiting cavity 414 gradually increases, the release resistance of the covered support 20 can be reduced to a certain extent, thereby improving the release efficiency of the covered support 20.

[0106] See Figure 20 , Figure 21and Figure 22 The conveying rod 410 may further include a convex ring 415, which is connected to the conveying body 411 and located within the sliding cavity 4111. The convex ring 415 protrudes a certain length radially from the inner wall of the sliding cavity 4111 relative to the conveying body 4111. The connecting structure 413 may include multiple slide grooves 4131, all of which are disposed on the conveying body 411 and spaced apart circumferentially from the conveying body 411. The slide grooves 4131 connect the limiting cavity 414 and the sliding cavity 4111. The slide grooves 4131 extend a certain length axially from the conveying body 411. The convex ring 415 may be closer to the proximal end of the conveying rod 410 relative to the slide groove 4131.

[0107] The gripper 430 is fixedly connected to the slide bar 420, meaning the gripper 430 can slide relative to the conveyor bar 410 following the slide bar 420. The number of gripper units 431 is equal to the number of slide grooves 4131, forming a one-to-one correspondence. The gripper units 431 protrude along the axial direction of the slide bar 420 at the distal end of the slide bar 420, and multiple gripper units 431 are spaced apart circumferentially along the slide bar 420.

[0108] The gripper unit 431 may include an elastic part 4311 and a gripper part 4312. The proximal end of the elastic part 4311 is connected to the slide bar 420, and the gripper part 4312 is connected to the proximal end of the elastic part 4311 at an angle, so that the gripper part 4312 is positioned further away from the central axis of the conveyor rod 410 relative to the elastic part 4311, thereby making the entire gripper unit 431 bendable. When the gripper unit 431 is in its natural state, the distance from the proximal end of the elastic part 4311 to the distal end of the conveyor rod 410 can gradually increase, thus making the elastic part 4311 at an angle to the axial direction of the conveyor rod 410, which can also be understood as the elastic part 4311 being tilted relative to the axial direction of the conveyor rod 410. The elastic part 4311 has a certain elastic force. When a compressive force is applied to the elastic part 4311 towards the central axis of the conveying rod 410, the elastic part 4311 can overcome its own elastic force and gradually move closer to the central axis of the conveying rod 410, thereby reducing the axial angle between the elastic part 4311 and the conveying rod 410. In its natural state, the entire elastic part 4311 can be regarded as a truncated cone-like body. The outer diameter of the proximal end of this truncated cone-like body is the smallest and can be approximately equal to the inner diameter of the convex ring 415, while the outer diameter of other parts of this truncated cone-like body can be larger than the inner diameter of the convex ring 415. The convex ring 415 can be fitted onto this truncated cone-like body, that is, the convex ring 415 is arranged around the truncated cone-like body.

[0109] When the convex ring 415 is fitted onto the proximal end of the frustum-like body, the elastic part 4311 is in a natural state, and the claw part 4312 extends into the limiting cavity 414 through the sliding groove 4131 in sequence, so that the claw part 4312 and the wave ring at the distal end of the covered bracket 20 form a locking effect, so that the distal end of the covered bracket 20 is in a fixed state.

[0110] When the slide rod 420 slides in the sliding cavity 4111, causing the convex ring 415 to gradually move closer to the distal end of the frustum-like body, the pawl part 4312 slides in the slide groove 4131 close to the proximal end of the slide groove 4131. The slide rod 420 will overcome the elastic force of the elastic part 4311 and apply a squeezing force towards the central axis of the conveying rod 410 to the elastic part 4311, causing the elastic part 4311 to swing closer to the central axis of the conveying rod 410, thereby causing the convex ring 415 to produce a radial compression effect on the frustum-like body. As the elastic part 4311 swings near the central axis of the conveying rod 410, the elastic part 4311 will cause the claw part 4312 to gradually exit from the slide groove 4131, and then the claw part 4312 will completely exit from the limiting cavity 414 and release the clamping relationship formed with the wave ring at the far end of the film-coated bracket 20. In this way, the fixing and binding effect of the entire claw 430 on the film-coated bracket 20 will be released, thereby facilitating the release of the film-coated bracket 20.

[0111] Therefore, when the claw 430 needs to fix the distal end of the covered stent 20 so that the covered stent 20 is in a semi-released state to block blood, the slide bar 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, the claw unit 431 will be in a natural state, so that the claw part 4312 extends into the limiting cavity 414 through the sliding groove 4131 to engage the wave ring at the distal end of the covered stent 20, and finally achieve the fixation of the distal end of the covered stent 20. When it is necessary to completely release the covered stent 20, the slide bar 420 can slide relative to the sliding cavity 4111, causing the convex ring 415 to gradually move closer to the distal end of the frustum-like body. This causes the convex ring 415 to exert a radial compression effect on the frustum-like body. The claw part 4312 will completely withdraw from the limiting cavity 414 and release the locking relationship formed between it and the wave ring at the distal end of the covered stent 20, thereby releasing the fixing and binding effect of the entire claw 430 on the covered stent 20, and finally realizing the release of the covered stent 20.

[0112] The conveying device 400 may also include a guide wire head 440, which may be located at the far end of the conveying body 411 to block the sliding cavity 4111 of the conveying body 411. The guide wire may be inserted into the slide 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] See Figure 23 , Figure 24 , Figure 25 and Figure 26 The conveying device 500 includes a conveying rod 510, a sliding rod 520, and a gripper 530. The conveying rod 510 has a sliding cavity 5111 and a connecting structure 513. The connecting structure 513 connects the outside world and the sliding cavity 5111. The conveying rod 510 is used to pass through the film-coating bracket 20, so that the distal end of the film-coating bracket 20 is sleeved on the conveying rod 510. The sliding cavity 5111 extends along the axial direction of the conveying rod 510. The sliding rod 520 is slidably engaged 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 body 511 and an outer sleeve 512. The outer sleeve 512 is fitted over the conveying body 511, with a portion of the outer sleeve 512 fixedly connected to the conveying body 511 and the other portion surrounding the conveying body 511. This forms an annular limiting cavity 514 between the outer sleeve 512 and the conveying body 511. Along the axial direction of the conveying rod 510, the distal end of the limiting cavity 514 is closed while the proximal end is not closed, with the opening of the limiting cavity 514 facing the proximal end of the conveying body 511. A sliding cavity 5111 is disposed on the conveying body 511. The limiting cavity 514 is interconnected with the sliding cavity 5111 through a connecting structure 513. A portion of the coated support 20 near its distal end can be accommodated in the limiting cavity 514. The limiting effect of the limiting cavity 514 can enhance the fixation effect of the distal end of the coated support 20 to a certain extent.

[0117] The width of the limiting cavity 514 can remain constant or increase from the distal end to the proximal end of the conveying body 511. (See reference...) 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 body 511 both extend along the axial direction of the conveying body 511. This can be understood as the inner surface of the outer sleeve 512 and the outer surface of the conveying body 511 being arranged parallel to each other. (See also...) Figure 28 As the width of the limiting cavity 514 increases, the inner surface of the outer sleeve 512 extends at an angle to the axial direction of the conveying body 511, while the outer surface of the conveying body 511 extends along its axial direction. This can be understood as the inner surface of the outer sleeve 512 and the outer surface of the conveying body 511 intersecting. As the width of the limiting cavity 514 gradually increases, the release resistance of the covered support 20 can be reduced to a certain extent, thus improving the release efficiency of the covered support 20.

[0118] The conveying rod 510 may further include an inner sleeve 515, which is connected to the conveying body 511 and located within the sliding cavity 5111. A guide cavity 5151 is formed between the inner sleeve 515 and the conveying body 511. The connecting structure 513 may include multiple grooves 5131, all of which are disposed on the conveying body 511 and spaced apart circumferentially along the conveying body 511. The grooves 5131 connect the limiting cavity 514 and the guide cavity 5151. The grooves 5131 extend a certain length axially along the conveying body 511. From the far end to the near end of the conveying rod 510, the cross-sectional dimension of the inner sleeve 515 gradually decreases, thus making the inner sleeve 515 a conical structure. While keeping the cross-sectional dimension of the sliding cavity 5111 constant, the width of the guide cavity 5151 can gradually increase.

[0119] The gripper 530 is fixedly connected to the slide bar 520, meaning the gripper 530 can slide relative to the conveyor bar 510 following the slide bar 520. The number of gripper units 530 is equal to the number of slide grooves 5131, forming a one-to-one correspondence. The gripper units 530 protrude along the axial direction of the slide bar 520 at the distal end of the slide bar 520, and multiple gripper units 530 are spaced apart circumferentially along the slide bar 520.

[0120] The gripper unit 530 may include an elastic portion 5311 and a gripper portion 5312. The proximal end of the elastic portion 5311 is connected to the slide bar 520, and the gripper portion 5312 is connected at an angle to the proximal end of the elastic portion 5311, such that the gripper portion 5312 is positioned further away from the central axis of the conveyor rod 510 relative to the elastic portion 5311, thereby making the entire gripper unit 530 bendable. When the gripper unit 530 is in its natural state, the elastic portion 5311 can extend along the axial direction of the conveyor rod 510. The elastic portion 5311 has a certain elasticity. When a compressive force opposite to the central axis of the conveyor rod 510 is applied to the elastic portion 5311, the elastic portion 5311 can overcome its own elasticity and gradually move away from the central axis of the conveyor rod 510, thereby making a certain angle between the elastic portion 5311 and the axial direction of the conveyor rod 510. In its natural state, the entire elastic part 5311 can be considered as a quasi-cylindrical shape, and the cavity enclosed by the quasi-cylindrical shape is called the 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, which can be understood as the minimum outer diameter of the inner sleeve 515 being greater than or equal to the inner diameter of the expansion cavity. When the elastic part 5311 is housed in the guide cavity 5151 and the inner sleeve 515 is inserted into the expansion cavity, the inner sleeve 515 will form an interference fit with the expansion cavity, so that the inner sleeve 515 applies a compressive force to the elastic part 5311 away from the central axis of the conveying rod 510, thereby causing the elastic part 5311 to overcome its own elasticity and gradually move away from the central axis of the conveying rod 510.

[0121] When the slide bar 520 moves closer to the far end of the conveying bar 510, causing the claw portion 5312 to move closer to the far end of the guide groove, the elastic portion 5311 is housed in the guide cavity 5151, and the inner sleeve 515 with a conical structure is gradually inserted into the expansion cavity, causing the inner sleeve 515 to gradually move closer to the far end of the slide bar 520. This causes the inner sleeve 515 to apply a compressive force to the expansion cavity away from the central axis of the conveying rod 510, i.e., to apply an expansion force. This causes the elastic part 5311 to overcome its own elasticity and gradually move away from the central axis of the conveying rod 510. The elastic part 5311 will drive the claw part 5312 to move away from the central axis of the conveying rod 510. The angle between the extension direction of the elastic part 5311 and the central axis of the conveying rod 510 gradually increases. The claw part 5312 will gradually extend into the slide groove 5131 and the limiting cavity 514. The claw part 5312 will form a locking action with the wave ring at the far end of the film-coated bracket 20, so that the far end of the film-coated bracket 20 is in a fixed state.

[0122] When the slide bar 520 moves away from the far end of the conveying rod 510 and causes the claw part 5312 to move closer to the proximal end of the guide groove, the inner sleeve 515 can be completely disengaged from the expansion cavity, the claw 530 is in a natural state, and the elastic part 5311 returns to extending along the axial direction of the conveying rod 510, so that the claw part 5312 is located outside the limiting cavity 514. The claw part 5312 will not be able to form a locking relationship with the wave ring at the far end of the film-coated bracket 20, thus eliminating the fixing and binding effect of the entire claw 530 on the film-coated bracket 20, thereby facilitating the release of the film-coated bracket 20.

[0123] Therefore, when the clasp 530 needs to fix the distal end of the covered stent 20, thereby placing the covered stent 20 in a semi-released state to block blood flow, the inner sleeve 515 can be gradually inserted into the expansion cavity, allowing the clasp portion 5312 to extend into the limiting cavity 514 to form a locking relationship with the wave coil at the distal end of the covered stent 20, ultimately fixing the distal end of the covered stent 20. When it is necessary to completely release the covered stent 20, the inner sleeve 515 can be completely withdrawn from the expansion cavity. Under the action of the elastic part 5311's own elasticity, the elastic part 5311 will return to its natural state, allowing the clasp portion 5312 to withdraw from the limiting cavity 514 and releasing the binding effect on the covered stent 20, ultimately achieving the complete release of the covered stent 20.

[0124] The conveying device 500 may also include a guide wire head 540, which may be located at the far end of the conveying body 511 to block the sliding cavity 5111 of the conveying body 511. The guide wire may be inserted into the slide bar 520, the claw 530 and the guide wire head 540.

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

[0126] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A conveying device, characterized in that, include: The conveying rod has a sliding cavity and a connecting structure. The connecting structure includes a plurality of through holes spaced apart along the circumference of the conveying rod. The sliding cavity is connected to the outside through the through holes, and the conveying rod is used to pass through the film-coating bracket. The slide rod is placed inside the sliding cavity and slides within the sliding cavity; and A claw, fixed to the conveying rod and capable of relative sliding with the slide rod, is capable of extending into or retracting from the communicating structure within the sliding cavity to fix the coating support to the conveying device or release the coating support from the conveying device; wherein... The conveying rod includes a conveying body and an outer sleeve. The outer sleeve is fitted outside the conveying body, and a portion of the outer sleeve is fixedly connected to the conveying body. The other portion of the outer sleeve surrounds the conveying body, forming an annular limiting cavity between the outer sleeve and the conveying body. Along the axial direction of the conveying rod, the distal end of the limiting cavity is closed while the proximal end is not closed, such that the opening of the limiting cavity faces the proximal end of the conveying body. The limiting cavity communicates with the sliding cavity through the communicating structure. A portion of the film-coated support near its distal end can be accommodated within the limiting cavity. The gripper includes a gripper unit and a fixing part. The fixing part is fixed in the sliding cavity and closer to the distal end of the conveying rod relative to the through hole. Multiple gripper units are spaced circumferentially at the proximal end of the fixing part. The gripper units are fixed relative to the conveying rod via the fixing part. When the gripper unit extends into the connecting structure, it forms a frustum-shaped cone and can hook onto the distal end of the coating bracket to fix the coating bracket to the conveying device. When the gripper unit retracts from the connecting structure, it disengages from the distal end of the coating bracket to release the coating bracket from the conveying device. The claw unit can extend into the connecting structure under its own elastic force, and the slide rod can drive the claw unit to exit the connecting structure; or, the claw unit can exit the connecting structure under its own elastic force, and the slide rod can drive the claw unit to extend into the connecting structure.

2. The conveying device according to claim 1, characterized in that, The claw also includes a guide portion, which is fixed in the sliding cavity and closer to the proximal end of the conveying rod relative to the through hole. The claw units are circumferentially spaced on the distal side of the guide portion. The slide rod can be slidably sleeved outside the guide portion and the claw units, and the slide rod can apply a compressive force to the claw units toward the central axis of the conveying rod.

3. The conveying device according to claim 2, characterized in that, The claw unit includes an elastic part and a claw part. The proximal end of the elastic part is connected to the guide part, and the claw part is connected at an angle to the distal end of the elastic part. The claw part can cooperate with the through hole. In the natural state, the distance from the proximal end of the elastic part to the distal end gradually increases from the proximal end to the central axis of the conveying rod.

4. The conveying device according to claim 1, characterized in that, The slide bar can be inserted into the expansion cavity formed by all the claw units and apply a compressive force to the claw units opposite to the central axis of the conveying rod.

5. The conveying device according to claim 4, characterized in that, The gripper unit includes an elastic part and a gripper part. The distal end of the elastic part is connected to the fixed part, and the gripper part is connected at an angle to the proximal end of the elastic part. In its natural state, the elastic part extends along the axial direction of the conveying rod so that the gripper part can exit the through hole.

6. The conveying device according to claim 5, characterized in that, The slide bar includes a tapered portion, the distal end of which is the distal end of the slide bar. The tapered portion can cooperate with the expansion cavity. From the proximal end to the distal end of the slide bar, the cross-sectional size of the tapered portion gradually decreases. In its natural state, the minimum cross-sectional size of the tapered portion is greater than or equal to the cross-sectional size of the expansion cavity.

7. The conveying device according to claim 1, characterized in that, The slide bar has a guide groove extending a predetermined length along its axial direction. The claw unit can be inserted into the through hole and slide in cooperation with the guide groove. The slide bar can be arranged around the claw unit and apply a pressing force to the claw unit toward the central axis of the conveying rod.

8. The conveying device according to claim 7, characterized in that, The claw unit includes an elastic part and a claw part. The distal end of the elastic part is connected to the fixed part and can be located inside the slide rod. The claw part is connected at an angle to the proximal end of the elastic part. In the natural state, the distance from the distal end of the elastic part to the proximal end gradually increases from the distal end to the proximal end.

9. The conveying device according to claim 1, characterized in that, The width of the limiting cavity remains constant from the distal end to the proximal end of the conveying body.

10. The conveying device according to claim 1, characterized in that, The width of the limiting cavity gradually increases from the far end to the near end of the conveying body.

Images