Delivery device and left atrial appendage closure system

Abstract

This utility model relates to a delivery device and a left atrial appendage closure system. The delivery device includes a head end, a connecting tube, a control handle, and a limiting rotation mechanism. The head end is used to cooperate with the closure clamp of the left atrial appendage closure system. The head end includes an openable and closable loading structure, which is configured to drive the closure clamp to open and close. The distal end of the connecting tube is connected to the head end, and the connecting tube and the head end are relatively fixed. The control handle is connected to the proximal end of the connecting tube and is configured to control the opening and closing of the loading structure. The limiting rotation mechanism cooperates with both the connecting tube and the control handle, and is configured to drive the connecting tube and the head end to rotate within a limited range. The delivery device proposed in this utility model can adjust the position of the head end relative to the patient's left atrial appendage and can limit the rotation of the head end to a certain range, avoiding continuous rotation that causes internal thread twisting. This solves the problem in existing delivery devices where the internal threads are easily knotted, leading to delivery device failure.

Description

Technical Field

[0001] This utility model belongs to the field of medical device technology, specifically relating to a delivery device and a left atrial appendage closure system. Background Technology

[0002] Atrial fibrillation (AF) is a common arrhythmia and an independent risk factor for mortality. The stroke rate is significantly increased in AF patients. Therefore, the primary treatment goal for AF is to prevent stroke and improve symptoms. Studies have shown that thrombi in 90% to 100% of AF patients with non-rheumatic heart disease originate from the left atrial appendage. Based on this, evidence-based medicine has proven that closing the left atrial appendage can prevent embolic complications in AF patients. In clinical treatment, cardiac surgeons usually use a special closure clip to close the left atrial appendage, thereby reducing the incidence of stroke in AF patients. During the process of closing the left atrial appendage with the closure clip, the operator needs to use a delivery device to transport the closure clip from outside the body to the root of the left atrial appendage inside the body.

[0003] To ensure the stability of the delivery device for open-chest surgery, the head end and handle are fixed relative to each other. A rotating mechanism connected to the head end allows for adjustment of the relative position of the head end and the patient's left atrial appendage. However, since the delivery device also contains control lines and unloading wires connected to the head end, the continuous rotation of the head end by the rotating mechanism can easily cause the control lines and unloading wires to twist, or even interfere and knot, affecting the use of the delivery device. Therefore, the existing delivery devices have the risk of internal wire knotting and failure. Summary of the Invention

[0004] The purpose of this invention is to at least solve the problem of conveyor device failure caused by the easy knotting of internal threads. This purpose is achieved through the following technical solution:

[0005] This utility model proposes a delivery device for a left atrial appendage closure system. The delivery device includes a head end, a connecting tube, a control handle, and a limiting rotation mechanism. The head end is used to cooperate with the closure clamp of the left atrial appendage closure system. The head end includes an openable and closable loading structure, which is configured to drive the closure clamp to open and close. The distal end of the connecting tube is connected to the head end, and the connecting tube and the head end are relatively fixed. The control handle is connected to the proximal end of the connecting tube and is configured to control the opening and closing of the loading structure. The limiting rotation mechanism cooperates with both the connecting tube and the control handle and is configured to drive the connecting tube and the head end to rotate within a limited range.

[0006] According to the delivery device proposed in this embodiment, its head end, connecting tube, and control handle are connected in sequence. When the delivery device is applied to the left atrial appendage closure system, the closure clamp of the left atrial appendage closure system is installed in the head end. The operator opens and closes the loading structure by operating the control handle, thereby driving the closure clamp to capture and clamp the left atrial appendage. The head end and connecting tube are set in a relatively fixed form to avoid shaking of the head end. In this embodiment, the limiting rotation mechanism can drive the head end and connecting tube to rotate simultaneously, adjusting the position of the head end relative to the patient's left atrial appendage. Moreover, the limiting rotation mechanism can limit the rotation of the head end to a certain range, avoiding continuous rotation that causes the internal threads to twist. This solves the problem that the internal threads in the existing delivery devices are prone to knotting, leading to the failure of the delivery device.

[0007] In addition, the conveying device according to the embodiments of this utility model may also have the following technical features:

[0008] In some embodiments of this utility model, the control handle includes a housing, the limiting rotation mechanism includes a rotating sleeve and an elastic element, the rotating sleeve is fixedly connected to the proximal end of the connecting tube, the rotating sleeve is partially located inside the housing and configured to rotate relative to the housing, the elastic element is retractably disposed on the rotating sleeve, and the inner wall of the housing is provided with a plurality of slots that cooperate with the elastic element.

[0009] In some embodiments of this utility model, a first limiting block is protruding from the rotating sleeve, and a second limiting block is protruding from the inner wall of the housing. The second limiting block is located on the rotation path of the first limiting block and is used to abut against the first limiting block to limit the rotation range of the rotating sleeve.

[0010] In some embodiments of this utility model, the rotating sleeve is provided with a mounting hole in the radial direction, the elastic element includes a spring and a ball pin connected together, the spring is disposed in the mounting hole, and the ball pin is used to cooperate with the slot.

[0011] In some embodiments of this utility model, a boss is provided on the rotating sleeve. The boss is located on the far end side of the first limiting block, and the top surface of the boss is flush with the top surface of the first limiting block. The mounting hole is provided in the boss.

[0012] In some embodiments of this utility model, a plurality of the slots are arranged at intervals along the circumference, each slot extends axially and is provided with an arc-shaped groove bottom along the circumference, and an arc-shaped transition surface that smoothly transitions with the arc-shaped groove bottom is provided between each two adjacent slots.

[0013] In some embodiments of this utility model, the outer peripheral surface of the rotating sleeve is provided with a first flange and a second flange spaced apart along the axial direction, and the distal end of the housing is configured as a snap-fit ​​portion in the radial direction, the snap-fit ​​portion being snapped between the first flange and the second flange.

[0014] In some embodiments of this utility model, the outer peripheral surface of the rotating sleeve is further provided with a third flange, and the housing is provided with an arc surface that contacts and engages with the third flange.

[0015] In some embodiments of this utility model, the third flange is disposed on the proximal side of the first limiting block, and the edge of the third flange is flush with the top surface of the first limiting block.

[0016] The second aspect of this utility model provides a left atrial appendage closure system, the left atrial appendage closure system comprising a closure clamp and a delivery device according to any of the above embodiments, the closure clamp being connected to the head end of the delivery device.

[0017] According to the left atrial appendage closure system proposed in this embodiment, the closure clamp is installed in the head end of the conveying device. The operator operates the conveying device to drive the closure clamp to open and close, thereby capturing and clamping the left atrial appendage. In this embodiment, the limiting rotation mechanism can limit the rotation of the head end and the closure clamp to a certain range, avoiding continuous rotation that would cause the internal threads of the conveying device to twist. This solves the problem of easy knotting of the internal threads in existing conveying devices, thereby preventing the failure of the conveying device and the left atrial appendage closure system. Attached Figure Description

[0018] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0019] Figure 1 This is a schematic diagram of the conveying device.

[0020] Figure 2 This is a schematic diagram of the left atrial appendage closure system.

[0021] Figure 3 for Figure 1 A schematic diagram of the structure at the head end of the conveying device shown;

[0022] Figure 4 for Figure 3 The diagram shows the structure of the joint component at the head end. Figure 1 ;

[0023] Figure 5 for Figure 3The diagram shows the structure of the joint component at the head end. Figure 2 ;

[0024] Figure 6 for Figure 3 A schematic diagram of a partial structure at the head end is shown;

[0025] Figure 7 for Figure 3 The diagram shows the structure of the loading arm at the head end;

[0026] Figure 8 for Figure 3 The side view of the head end is shown;

[0027] Figure 9 for Figure 8 A partial sectional view along the AA direction;

[0028] Figure 10 for Figure 1 A partial sectional view of the conveying device shown;

[0029] Figure 11 for Figure 10 A schematic diagram of the structure of the lower cover of the middle handle;

[0030] Figure 12 for Figure 10 A schematic diagram of one possible state of the conveying device shown;

[0031] Figure 13 for Figure 10 Another schematic diagram of the conveying device shown;

[0032] Figure 14 for Figure 10 The diagram shows the structure of the limiting rotation mechanism in the conveying device. Detailed Implementation

[0033] As described in the background section, in the prior art, the continuous rotation of the head end driven by the rotating mechanism can easily cause the control line and unloading wire to twist, and may even cause interference and knotting of the control line and unloading wire, affecting the use of the conveying device. In this regard, the present invention proposes a conveying device that, by setting a limiting rotating mechanism, limits the rotation of the head end to a certain range while driving the head end to rotate, avoiding continuous rotation, and solving the problem that the internal wires of the existing conveying device are prone to knotting, causing the conveying device to fail.

[0034] The following description, in conjunction with the accompanying drawings of the embodiments of this utility model, uses terminology for the purpose of describing specific exemplary embodiments only and should not be construed as limiting the utility model. For example, the terms "comprising" and "having" not only indicate the presence of the stated features but also exclude the presence of other features; the terms "first" and "second" do not imply order or sequence; the terms "internal," "external," "above," and "below" are only for the convenience of describing the relationship between one feature and another shown in the drawings and do not indicate that they must have a specific orientation. It should be noted that in the field of interventional medical devices, proximal refers to the end closer to the operator, and distal refers to the end farther from the operator; axial direction refers to the direction parallel to the line connecting the center of the distal end and the center of the proximal end of the medical device in its natural state. In the description of this utility model, the above definitions are only for convenience of expression and should not be construed as limiting the utility model.

[0035] Please see Figure 1 The first aspect of this utility model provides a delivery device 100, which is applied in the left atrial appendage closure system 1000 proposed in the second aspect of this utility model. The delivery device 100 includes a head end 10, a connecting tube 20, a control handle 30, and a limiting rotation mechanism 40. The head end 10 is used to cooperate with the closure clamp 200 of the left atrial appendage closure system 1000. The head end 10 includes an openable and closable loading structure, which is configured to drive the closure clamp 200 to open and close. The distal end of the connecting tube 20 is connected to the head end 10, and the connecting tube 20 and the head end 10 are configured to be relatively fixed. The control handle 30 is connected to the proximal end of the connecting tube 20, and the control handle 30 is configured to control the opening and closing of the loading structure. The limiting rotation mechanism 40 cooperates with the connecting tube 20 and the control handle 30 respectively, and is configured to drive the connecting tube 20 and the head end 10 to rotate within a limited range.

[0036] In the conveying device 100 proposed in this embodiment, the head end 10, connecting pipe 20 and control handle 30 of the conveying device 100 are connected in sequence. When the conveying device 100 is applied to the left atrial appendage closure system 1000, the closure clamp 200 of the left atrial appendage closure system 1000 is installed in the head end 10. The operator opens and closes the loading structure by operating the control handle 30, which drives the closure clamp 200 to open and close, thereby capturing and clamping the left atrial appendage. The head end 10 and the connecting pipe 20 are set in a relatively fixed form, which can prevent the head end 10 from shaking. In this embodiment, the limiting rotation mechanism 40 can drive the head end 10 and the connecting pipe 20 to rotate simultaneously, adjust the relative position of the head end 10 relative to the patient's left atrial appendage, and the limiting rotation mechanism 40 can limit the rotation of the head end 10 to a certain range, avoiding the internal thread from twisting due to continuous rotation, thus solving the problem of easy knotting and failure of the internal thread in the existing conveying device.

[0037] Please continue reading. Figure 2The second aspect of this utility model provides a left atrial appendage closure system 1000, which includes a closure clamp 200 and a conveying device 100 according to the above embodiment. The closure clamp 200 is connected to the head end 10. According to the left atrial appendage closure system 1000 of this utility model embodiment, the closure clamp 200 is installed in the head end 10 of the conveying device 100. The operator operates the control handle 30 to open and close the loading structure of the conveying device 100, thereby driving the closure clamp 200 to open and close, achieving capture and clamping of the left atrial appendage. This utility model embodiment, by setting a limiting rotation mechanism 40 in the conveying device, drives the head end 10 and the connecting tube 20 to rotate and adjust within a limited range, avoiding the twisting and knotting of the internal threads of the conveying device 100 due to continuous rotation of the head end 10. The following embodiments are described in detail with reference to the conveying device 100 and the left atrial appendage closure system 1000.

[0038] like Figure 1 As shown, the conveying device 100 includes a head end 10, a connecting pipe 20, and a control handle 30 connected in sequence. The proximal end of the head end 10 is connected to the distal end of the connecting pipe 20, and the two are fixed relative to each other. Exemplarily, the two can be connected by fasteners such as screws or pins. Figure 1 As shown, a knurled pin is radially inserted at the proximal end of the head end 10. The middle section of the knurled pin is knurled, and the rest is smooth. The knurled section is interference-fitted with the head end and the connecting pipe, so that the head end 10 cannot rotate relative to the connecting pipe 20, thus avoiding shaking during use and ensuring the stability of the head end 10. Compared with welding and other connection methods, the use of knurled pin connection is easier to assemble.

[0039] Please continue reading. Figure 1 and Figure 2 In this embodiment, the head end 10 includes a loading structure for loading the closure clamp 200 in the left atrial appendage closure system 1000. The loading structure opens and closes to drive the closure clamp 200 to open and close, that is, when open, it captures target tissue such as the left atrial appendage, and when closed, it clamps the left atrial appendage. Figure 3 As shown, in some embodiments of this utility model, the loading structure includes a first loading arm 11 and a second loading arm 12 hinged together. It can be understood that the closing clamp 200 typically includes two clamping arms for holding the left atrial appendage. Therefore, in this embodiment, the first loading arm 11 and the second loading arm 12 are respectively connected to the two clamping arms of the closing clamp 200. When the loading structure opens and closes, the first loading arm 11 and the second loading arm 12 rotate relative to each other, causing the two clamping arms to rotate relative to each other. (Continue reading...) Figures 1 to 3 The first loading arm 11 and the second loading arm 12 can be provided with grooves for clamping arms to be installed. Furthermore, they can be bound together by wire ring 101 and unloading wire 52. The unloading method of unloading wire 52 and closing clamp 200 will be described in detail in subsequent embodiments.

[0040] like Figures 3 to 9 As shown, in some embodiments of this utility model, the head end 10 further includes a transmission mechanism and a joint 14. Further, referring to... Figure 1 and Figure 2 In some embodiments of this utility model, the proximal end of the joint member 14 is configured as a bent portion 141, which is connected to the connecting tube 20, so that the axis of the connecting tube 20 and the axis of the head end 10 are configured to form a first included angle α.

[0041] For example, the joint member 14 is configured as a one-piece injection molded part. The bent portion 141 at the proximal end of the joint member 14 has a set angle, thereby creating a certain angle between the head end 10 and the connecting tube 20. This facilitates the operator in delivering the closing clamp 200 loaded on the head end 10 to a designated location within the patient's body during surgery. Based on the above embodiment, the proximal end of the joint member 14 is fixedly connected to the connecting tube 20 by knurled pins. Therefore, regardless of whether the head end 10 is in the open or closed state of the loading structure, the first included angle α remains unchanged, thus ensuring the relative stability between the head end 10 and the connecting tube 20, thereby improving the stability of the closing clamp 200.

[0042] Based on the above embodiments, the first included angle α is set as an obtuse angle, and the value of the first included angle α is between 90° and 180°. For example, the first included angle α can be set to 120°, 135° or 150° to facilitate clinical use by the operator. In this embodiment, the specific value of the first included angle α is not set, and it can be set according to the actual situation. In addition, in some embodiments of this utility model, the connecting tube 20 is set as a bendable tube, for example, it can be set as a metal tube that can undergo plastic deformation under external force. That is to say, during the use of the delivery device 100, the operator can bend the connecting tube 20 according to the actual clinical situation of the patient to better deliver the closing clamp 200.

[0043] Furthermore, such as Figures 3 to 5 As shown, the joint 14 includes thin walls 142 formed at the distal end of the bend 141 and disposed opposite to each other on both sides. A transmission mechanism can be disposed between the two thin walls 142. The transmission mechanism is connected to the first loading arm 11 and the second loading arm 12 to drive the first loading arm 11 and the second loading arm 12 to rotate about the hinge point. Exemplarily, in conjunction with reference to... Figure 6 The transmission mechanism includes a movable pulley 131 and four connecting plates 132. The four connecting plates 132 are arranged in pairs, and the two pairs of connecting plates are respectively arranged at both ends of the axial direction of the movable pulley 131.

[0044] For further information, please refer to [link / reference]. Figure 6Both the first loading arm 11 and the second loading arm 12 are equipped with a connection structure that cooperates with the transmission mechanism, and the connection structures of the two are centrally symmetrical. (See also...) Figure 7 Taking the first loading arm 11 as an example, the first loading arm 11 is provided with a first connecting part 112 for hinged connection with the second loading arm 12. The first connecting part 112 of the first loading arm 11 overlaps with the corresponding position of the second loading arm 12, and the two are hinged to the first connecting part 112 by connecting parts such as rivets or pins. In this embodiment, the first loading arm 11 and the second loading arm 12 are connected at the first connecting part 112 by semi-hollow rivets, which facilitates assembly while ensuring the reliability of the connection. (See reference...) Figure 3 The thin wall of the joint 14 has a through hole near the distal end that mates with the aforementioned semi-hollow rivet. Thus, the first loading arm 11 and the second loading arm 12 are connected to the joint 14 through the semi-hollow rivet and can rotate around the semi-hollow rivet to open and close.

[0045] Based on the above implementation methods, such as Figure 6 and Figure 7 As shown, a second connecting part 113 is provided at the proximal end of the first loading arm 11. The axis of the second connecting part 112 is perpendicular to the axis of the conveying device and has a certain thickness. When connected to the transmission mechanism, the second connecting part 113 is connected to two connecting pieces 132 respectively. The two connecting pieces 132 are connected to the two ends of the second connecting part 113 respectively. The connecting pieces 132 and the second connecting part 113 are connected by semi-hollow rivets, which facilitates assembly and ensures the reliability of the connection. The other end of the two connecting pieces 132 is connected to the movable pulley 131 by knurled pins 133.

[0046] It should be noted that in the above embodiment, the middle section of the knurled pin 133 is set as a knurled section, and the remaining part is set as a smooth section. The knurled section of the knurled pin 133 is interference-fitted with the movable pulley 131 and the four connecting pieces 132. (See also...) Figure 3 The joint 14 has elongated grooves 143 on both sides of the thin wall 142. The smooth rods at both ends of the knurled pin 133 extend into the grooves 142. Thus, when the movable pulley 131 rotates, it synchronously drives the knurled pin 133 to move in the grooves 142. The two connecting pieces 132 in each group rotate relative to each other, thereby driving the first loading arm 11 and the second loading arm 12 to rotate relative to each other, so that the loading structure opens and closes.

[0047] Furthermore, in some embodiments of this utility model, the control handle 30 includes a drive mechanism and a control line 32. In this embodiment, the drive mechanism drives the control line 32 to move, and the control line 32 drives the movable pulley 131 to rotate, thereby driving the loading structure to open and close. Figure 9As shown, in an optional embodiment, a cavity is formed in the bending portion 141 of the joint member 14. A wire hole for the control line 32 to pass through is provided on the distal wall of the bending portion 141. The distal end of the control line 32 first extends into the cavity of the bending portion 141 in the direction from the proximal end to the distal end, passes through the first wire hole to the space between the two thin walls of the joint member 14, and is wound around the movable pulley 131. Then, it extends into the cavity of the bending portion 141 in the direction from the distal end to the proximal end through the second wire hole. The distal end of the control line 32 is engaged with the proximal end face of the distal wall of the bending portion 141 by means of a connecting nut.

[0048] Further, please refer to Figure 1 , Figures 10 to 13 The control handle 30 includes a housing, a drive plate 31, a control cable 32, and a wrench 33. The housing includes an upper cover 301 and a lower cover 302 that are snapped together. The upper cover 301 and the lower cover 302 can be connected by a snap or fastener. The lower cover 302 is provided with a connecting groove 303 that mates with the wrench 33. The wrench 33 includes a first structure 331 located outside the housing and a second structure 332 located inside the housing. The structure 331 is for the operator to hold and press. The distal end of the second structure 332 is rotatably connected to the connecting groove 303, and the proximal end of the structure 332 is rotatably connected to the drive plate 31. The proximal end of the drive plate 31 is provided with a slider 311. Correspondingly, the lower cover 302 is provided with a sliding groove 304 that mates with the slider 311.

[0049] Based on the above embodiments, the control handle 30 may also include a spring 34, and a positioning post 305 that cooperates with the spring 34 is provided on the lower cover 302. The positioning post 305 is located above the structure 332 and the drive plate 31. One end of the spring 34 is sleeved on the positioning post 305, and the other end is connected to the middle part of the drive plate 31.

[0050] Based on the above embodiments, the proximal end of the control line 32 is located inside the housing. For example, a clamping screw 322 installed near the drive plate 31 is provided inside the housing. The control line 32 can be directly fixedly connected to the clamping screw 322, or, as... Figure 10 As shown, a portion of the control line 32 near its proximal end can be wound between the clamping screw 322 and the drive plate 31. After the proximal end of the control line 32 extends a short distance toward the distal end, it is fixedly bound to its own segment.

[0051] Therefore, as Figures 10 to 13 As shown, when the operator presses the wrench 33, the wrench 33 rotates around the connecting groove 303, the second structure 332 rotates counterclockwise, and the drive plate 31 rotates accordingly and slides along the slide groove 304 towards the proximal end until it is as shown. Figure 13At the position shown, simultaneously, the connection point between the second structure 332 and the drive plate 31 gradually moves to one side of the line connecting the connecting groove 303 and the slider 311. The drive plate 31 drives the control line 32 to move synchronously, combined with... Figure 10 The control line 32 drives the movable pulley 131 to move towards the near end, thereby opening the loading structure and closing clamp 200. The second structure 332 and the drive plate 31 are locked between the connecting groove 303 and the slide groove 304 by the pulling force of the control line 32. When the operator opens the wrench 33 in the opposite direction, the second structure 332 rotates clockwise, engaging... Figure 10 and Figure 12 The proximal end of the drive plate 31 slides toward the distal end and drives the control line 32 to move toward the distal end. The movable pulley 131 moves toward the distal end to return to the initial working condition. The loading structure and the closing clamp 200 close to complete the clamping of the left atrial appendage.

[0052] like Figure 1 and Figure 10 As shown, the operating handle also includes an unloading wire 52 and an unloading plug 51 connected to the unloading wire 52, see reference [link / reference]. Figure 2 As described in the above embodiments, the unloading wire 52 is connected to the loop 101, and the head end 10 drives the closing clamp 200 to open and close. The unloading plug 51 is used to drive the unloading wire 52 to retract after the closing clamp 200 clamps the left atrial appendage. For example, two unloading wires 52 are provided at the head end, and they respectively cooperate with the first loading arm 11 and the second loading arm 12. In this embodiment, the unloading wire 52 can be set as a metal wire.

[0053] Taking one of them as an example, the unloading wire 52 is axially attached to the clamping arm of the closing clamp 200 and the first loading arm 11 along the head end 10, and is clamped by the clamping arm and the first loading arm 11, thus combining... Figure 2 , Figures 6 to 8 The first loading arm 11 is provided with a loading hole 111 that mates with the wire loop 101. The wire loop 101 is wound around the outer circumference of the unloading wire 52 and the clamping arm, binding the unloading wire 52 to the clamping arm. The proximal end of the unloading wire 52 passes through the housing of the control handle 30 and is connected to the unloading plug 51 located at the proximal end of the housing. After the closing clamp 200 completes the left atrial appendage clamping operation, the operator can remove the unloading plug 51 to pull away the unloading wire 52, thereby disconnecting it from the wire loop 101 and allowing the subsequent head end 10 to be removed. In this embodiment, the setting of the unloading plug 51 avoids the wire cutting operation after clamping is completed, improving the ease of use of the conveying device 100.

[0054] Please see Figures 10 to 13In some embodiments of this utility model, the limiting rotation mechanism 40 includes a rotating sleeve 41 and an elastic element. The rotating sleeve 41 is fixedly sleeved on the connecting pipe 20. For example, the rotating sleeve 41 can be integrally molded on the proximal end of the connecting pipe 20 by injection molding. The rotating sleeve 41 is partially located inside the housing and can rotate relative to the housing. In some embodiments of this utility model, an actuating element 411 is provided on the side wall of the rotating sleeve 41 outside the housing. The actuating element 411 is integrally molded on the rotating sleeve 41 and is used by the operator to actuate and drive the rotating sleeve 41 and the connecting pipe 20 to rotate.

[0055] Furthermore, the elastic element is telescopically mounted on the rotating sleeve 41, correspondingly, such as Figure 11 and Figure 12 As shown, the inner wall of the housing is provided with multiple slots 306. During the rotation of the rotating sleeve 41, the elastic element rotates continuously, thereby making telescopic movements in and between the multiple slots 306. When the rotating sleeve 41 stops rotating, the elastic element can be engaged in one of the slots 306, thereby preventing the rotating sleeve 41 from continuing to rotate, realizing the limiting function, and completing the adjustment.

[0056] Continue reading Figures 11 to 14 In one optional embodiment, the elastic element includes a ball 42 and a spring 43. The rotating sleeve 41 has a radially arranged mounting hole 412. In some embodiments of this invention, a boss 414 protrudes from the rotating sleeve 41, the mounting hole 412 is disposed in the boss 414, and the spring 43 is disposed within the mounting hole 412. The bottom of the ball 42 abuts against or connects with the spring 43, and the top of the ball 42 can extend out of the mounting hole 412 and cooperate with the housing. Multiple slots 306 in the housing are evenly arranged circumferentially. Therefore, the ball 42, under the elastic force of the spring 43, tends to move away from the mounting hole 412. When the rotating sleeve 41 rotates, the ball 42 continuously extends and retracts within and between the multiple slots 306. When the rotating sleeve 41 stops rotating, the ball 42 is engaged in one of the slots 306. In this embodiment, the arrangement of the ball 42 improves the smoothness of the rotating sleeve 41 during rotation.

[0057] In some embodiments of this utility model, each slot 306 extends axially and has an arc-shaped bottom in the circumferential direction, and an arc-shaped transition surface that smoothly transitions to the arc-shaped bottom is provided between each two adjacent slots 306. That is, the inner wall surface of the corresponding position of the housing is a wave surface composed of multiple arc surfaces that smoothly connect in the circumferential direction. When the rotating sleeve 41 rotates, the top of the ball 42 continuously contacts the smoothly transitioned arc surface, forming a buffer during the extension and retraction movement to avoid jamming. This further improves the smoothness of the rotation of the rotating sleeve 41 and the connecting pipe 20 as a whole, and reduces the force required for adjustment, thus improving ease of use.

[0058] Furthermore, the rotating sleeve 41 and the connecting pipe 20 rotate within a set angle range, which is 180°~360°. For example, it can be set to 360°, 350°, 330°, 300°, etc. In this embodiment, rotation is limited by setting a limiting block. For example, Figure 14 As shown, a first limiting block 413 protrudes from the rotating sleeve 41, as... Figure 11 As shown, a second limiting block 307 protrudes from the inner wall of the housing. The second limiting block 307 is located on the rotation path of the first limiting block 413. When the rotating sleeve 41 rotates clockwise, it stops rotating when the right side wall of the first limiting block 413 abuts against the right side wall of the second limiting block 307. When the rotating sleeve 41 rotates counterclockwise, it stops rotating when the left side wall of the first limiting block 413 abuts against the left side wall of the second limiting block 307. It can be understood that the angle between the two stopping positions is the rotation range of the rotating sleeve 41 and the connecting pipe 20. This embodiment prevents the rotating sleeve 41 and the connecting pipe 20 from rotating without restriction by limiting the rotation range, avoiding twisting or interference of internal control lines, unloading wires, etc., and avoiding the risk of failure of the conveying device while ensuring that the direction can be adjusted.

[0059] According to the above embodiment, the rotating sleeve 41 also has a boss 414. In this embodiment, as shown... Figure 14 As shown, the boss 414 is located on the far end of the first limiting block 413, and the top surface of the boss 414 is flush with the top surface of the first limiting block 413. For example, the boss 414 and the first limiting block 413 can be integrally formed on the rotating sleeve 41. In addition, in order to facilitate the setting of the mounting hole 412, the width of the boss 414 can be greater than the width of the first limiting block 413.

[0060] Please continue reading. Figures 11 to 14 In some embodiments of this utility model, the outer peripheral surface of the rotating sleeve 41 is provided with a first flange 415 and a second flange 416 spaced apart along the axial direction, such as... Figure 11 As shown, the distal end of the housing is radially configured as a snap-fit ​​portion. When the control handle is assembled with the connecting pipe 20 and the rotating sleeve 41, the snap-fit ​​portion engages between the first flange 415 and the second flange 416. Understandably, the upper cover 301 and the lower cover 302 of the housing both extend radially at their distal ends to form constricted openings. After the upper cover 301 and the lower cover 302 are fastened together, the two constricted openings align to form an opening, at which a snap-fit ​​portion 308 is formed. The snap-fit ​​portion 308 cooperates with the first flange 415 and the second flange 416 of the rotating sleeve 41, restricting the axial movement of the rotating sleeve 41 and the connecting pipe 20, thereby improving the overall stability of the conveying device.

[0061] Furthermore, such as Figure 11As shown, in some embodiments of this utility model, a third flange 417 is further provided on the outer peripheral surface of the rotating sleeve 41. Based on the above embodiments, the third flange 417 is provided on the proximal end side of the first limiting block 413, that is, integrally formed on the proximal end of the rotating sleeve 41. The edge of the third flange 417 is flush with the top surface of the first limiting block 413, which facilitates processing. Based on the above embodiments, as... Figure 14 As shown, the housing is provided with an arc surface 309 that contacts and engages with the third flange 417. For example, the upper cover 301 and the lower cover 302 of the housing are respectively provided with arc-shaped protrusions. When the upper cover and the lower cover are fastened together and assembled with the rotating sleeve 41, the two arc-shaped protrusions are located on both sides of the third flange 417 and contact the third flange 417. When the rotating sleeve 41 rotates, the third flange 417 can rotate relative to the arc surfaces on both sides. In this embodiment, the engagement between the arc surface and the third flange 417 can further prevent the rotating sleeve 41 and the connecting pipe 20 from shaking, thereby improving the overall stability of the conveying device.

[0062] The above are merely preferred embodiments of this utility model, but the scope of protection of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the scope of protection of this utility model. Therefore, the scope of protection of this utility model should be determined by the scope of the claims.

Claims

1. A delivery device for use in a left atrial appendage closure system, characterized in that, The delivery device includes a head end, a connecting tube, a control handle, and a limiting rotation mechanism. The head end is used to cooperate with the closure clamp of the left atrial appendage closure system. The head end includes an openable and closable loading structure, which is configured to drive the closure clamp to open and close. The distal end of the connecting tube is connected to the head end, and the connecting tube and the head end are configured to be relatively fixed. The control handle is connected to the proximal end of the connecting tube, and the control handle is configured to control the opening and closing of the loading structure. The limiting rotation mechanism cooperates with the connecting tube and the control handle respectively, and is configured to drive the connecting tube and the head end to rotate within a limited range.

2. The conveying device according to claim 1, characterized in that, The control handle includes a housing, and the limiting rotation mechanism includes a rotating sleeve and an elastic element. The rotating sleeve is fixedly connected to the proximal end of the connecting tube. The rotating sleeve is partially located inside the housing and is configured to rotate relative to the housing. The elastic element is retractably disposed on the rotating sleeve, and the inner wall of the housing is provided with a plurality of slots that cooperate with the elastic element.

3. The conveying device according to claim 2, characterized in that, A first limiting block protrudes from the rotating sleeve, and a second limiting block protrudes from the inner wall of the housing. The second limiting block is located on the rotation path of the first limiting block and is used to abut against the first limiting block to limit the rotation range of the rotating sleeve.

4. The conveying device according to claim 3, characterized in that, The rotating sleeve has a mounting hole in the radial direction. The elastic element includes a spring and a ball pin connected together. The spring is disposed in the mounting hole, and the ball pin is used to cooperate with the slot.

5. The conveying device according to claim 4, characterized in that, The rotating sleeve has a protruding boss located at the far end of the first limiting block, and the top surface of the boss is flush with the top surface of the first limiting block. The mounting hole is located in the boss.

6. The conveying device according to claim 4, characterized in that, The multiple slots are arranged at intervals along the circumference, each slot extends axially and has an arc-shaped groove bottom along the circumference, and an arc-shaped transition surface that smoothly transitions with the arc-shaped groove bottom is provided between each two adjacent slots.

7. The conveying device according to claim 4, characterized in that, The outer circumferential surface of the rotating sleeve is provided with a first flange and a second flange spaced apart along the axial direction. The distal end of the housing is configured as a snap-fit ​​portion in the radial direction, and the snap-fit ​​portion snaps between the first flange and the second flange.

8. The conveying device according to claim 7, characterized in that, The outer circumferential surface of the rotating sleeve is also provided with a third flange, and the inner surface of the housing is provided with an arc surface that contacts and engages with the third flange.

9. The conveying device according to claim 8, characterized in that, The third flange is disposed on the proximal side of the first limiting block, and the edge of the third flange is flush with the top surface of the first limiting block.

10. A left atrial appendage closure system, characterized in that, The left atrial appendage closure system includes a closure clamp and a delivery device according to any one of claims 1-9, wherein the closure clamp is connected to the head end of the delivery device.

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