A pusher and system for a plugging device

Abstract

This invention relates to a pusher and system for an occluder, the pusher comprising: a handle housing having a receiving cavity inside; a cannula connector slidably disposed within the receiving cavity; a first drive assembly disposed within the receiving cavity and lockably or releaseably connected to the cannula connector, the first drive assembly driving the cannula connector to slide axially; a second drive assembly disposed within the receiving cavity and lockably or releaseably connected to the cannula connector, the second drive assembly driving the cannula connector to slide axially; a cannula extending axially, its proximal end fixedly connected to the cannula connector; and a core rod slidably inserted within the cannula, its proximal end connected to the second drive assembly. This pusher has three occluder forming methods, which can be flexibly selected according to actual needs, meeting the different requirements of different surgical scenarios.

Description

Technical Field

[0001] This invention relates to the field of medical devices, and in particular to a pusher and system for an occluder. Background Technology

[0002] Catheter-based interventional methods are a common treatment for cardiovascular diseases. For example, catheter-based interventional procedures can be used to place occluders, such as atrial septal defect (ASD) occluders, ventricular septal defect (VSD) occluders, patent ductus arteriosus (PDA) occluders, and patent foramen ovale (PFO) occluders, reaching the defect site in the heart to close the defect and treat the heart disease.

[0003] Traditional occluders are primarily made of metal. While effective in treating cardiac defects, their permanent presence in the patient's body can lead to long-term complications such as erosion, allergies, and conduction blocks. Absorbable occluders, on the other hand, are gradually absorbed by the body after treatment, thus avoiding these complications. However, unlike metal occluders, absorbable occluders do not possess excellent memory recovery properties. Therefore, a delivery device is required to control the shaping of the occluder during implantation. Currently available delivery devices offer only one shaping method, making it difficult to meet diverse clinical needs. Summary of the Invention

[0004] Therefore, it is necessary to provide a pusher for an occluder to address the above problems, including: a handle housing having a receiving cavity inside;

[0005] A sleeve connector is slidably disposed within the receiving cavity; a first drive assembly is disposed within the receiving cavity and is lockably or releaseably connected to the sleeve connector, the first drive assembly driving the sleeve connector to slide axially; a second drive assembly is disposed within the receiving cavity and is lockably or releaseably connected to the sleeve connector, the second drive assembly driving the sleeve connector to slide axially; a sleeve extends axially, its proximal end being fixedly connected to the sleeve connector; a core rod is slidably inserted within the sleeve, its proximal end being fixedly connected to the second drive assembly.

[0006] Furthermore, the first drive assembly includes a screw and a roller. The distal end of the screw is connected to the sleeve joint via a first locking unit. The roller is sleeved on the outer periphery of the screw for threaded connection, and the roller is axially confined within the receiving cavity.

[0007] Furthermore, a slider is fixedly connected to the proximal end of the screw, and the slider is slidably connected to the handle housing.

[0008] Furthermore, the sleeve connector has an inner cavity extending through its proximal and distal ends and is provided with a locking threaded hole communicating with the inner cavity. The distal end of the screw can extend into the inner cavity. The first locking unit includes a threaded rod that can be screwed into or out of the locking threaded hole and abut against or move away from the screw.

[0009] Furthermore, the sleeve connector has an inner cavity extending through its proximal and distal ends and is provided with a locking threaded hole communicating with the inner cavity. The distal end of the screw can extend into the inner cavity. The first locking unit includes a threaded rod that can be screwed into or out of the locking threaded hole. The distal sidewall of the screw has a locking groove, and the end of the threaded rod can extend into or exit the locking groove.

[0010] Furthermore, the second drive assembly includes a translation component, a first rack, a gear, a second rack, and a connecting rod. The proximal end of the core rod is fixedly connected to the translation component, the proximal end of the first rack is fixedly connected to the translation component, the gear is located between the first rack and the second rack and meshes with both of them simultaneously, and the distal end of the connecting rod is fixedly connected to the sleeve joint, while the proximal end is connected to the second rack via a second locking unit.

[0011] Furthermore, the second rack has a rack groove extending axially, and an elongated locking through hole is provided on the proximal end side of the connecting rod; the second locking unit has a locking rod and an upper limit block and a lower limit block spaced apart on the locking rod, the upper limit block having a lower inclined surface, the lower inclined surface causing the thickness of the upper limit block to gradually decrease in the direction away from the locking rod; the lower limit block having an upper inclined surface opposite to the lower inclined surface, the upper inclined surface causing the thickness of the lower limit block to gradually decrease in the direction away from the locking rod; the lower limit block passes through the rack groove and the locking through hole in sequence, so that the connecting rod and the second rack are located between the upper limit block and the lower limit block; the minimum distance between the upper inclined surface and the lower inclined surface along the axial direction of the locking rod is less than the sum of the thicknesses of the connecting rod and the second rack, while the maximum distance is greater than the sum of the thicknesses of the connecting rod and the second rack.

[0012] Furthermore, the connecting rod includes an intermediate rod; the intermediate rod has a distal connecting portion on its distal end and a proximal connecting portion on its proximal end, the distal connecting portion being connected to the sleeve joint, and the locking through hole being disposed on the proximal connecting portion.

[0013] Furthermore, the translation assembly includes a translation member and a core rod mounting base. The proximal end of the core rod is fixedly connected to the core rod mounting base. The translation member is connected to the core rod mounting base, and the translation member can push the core rod mounting base to reciprocate axially.

[0014] This application also relates to a pusher system, including the aforementioned pusher, and further including: a blocker, the blocker including a distal network disk and a proximal network disk connected to each other, the distal network disk having a distal end cap, the proximal network disk having a proximal end cap; the core rod being detachably connected to the distal end cap, and the sleeve being detachably connected to the proximal end cap.

[0015] The technical solution of the present invention has the following beneficial effects: The pusher used in the present invention for the occluder has three different molding methods for the occluder, and one of the molding methods can be flexibly selected according to actual needs. It has wide adaptability and high flexibility, and can meet the different requirements of different surgical scenarios. Attached Figure Description

[0016] Figure 1 This is a diagram showing the overall appearance and structure of the pusher;

[0017] Figure 2 This is an exploded view of the pusher.

[0018] Figure 3 This is a diagram showing the internal structure of the pusher after removing the handle shell;

[0019] Figure 4 This is a partial structural diagram of the pusher after removing the upper casing;

[0020] Figure 5 This is a sectional view related to the first locking unit;

[0021] Figure 6 This is a three-dimensional structural diagram of the connecting rod;

[0022] Figure 7a This is the main view of the second locking unit;

[0023] Figure 7b A structural diagram showing the second locking unit in the released state;

[0024] Figure 7c A structural diagram showing the second locking unit in a locked state;

[0025] Figure 8 This is a structural diagram of the pusher after the upper shell has been removed;

[0026] Figure 9 Here are the structural diagrams related to the core rod locking component;

[0027] Figure 10 Here is a structural diagram of the translation component;

[0028] Figure 11 This is a structural diagram of the plugging device; Detailed Implementation

[0029] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be 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 the present invention. However, the present invention can be practiced 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 the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0030] It should be noted that when 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. When 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. The terms "upper," "lower," "left," "right," and similar expressions used to indicate orientation are for illustrative purposes only and do not represent the only possible implementations. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the specification of this invention is for the purpose of describing particular embodiments only and is not intended to limit the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0031] It should be noted that, for medical devices, the end of the device relatively closer to the operator is generally called the "proximal end," and the end relatively farther from the operator is called the "distal end." Based on this principle, the "proximal end" and "distal end" of any component in the delivery system are defined. "Proximal end" and "distal end" are only used to describe orientation and do not necessarily refer to the end face of the proximal or distal end. "Axial axis" or "longitudinal axis" 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; "radial axis" or "lateral axis" refers to the direction perpendicular to the axial direction. The specific orientation is determined by… Figure 2 The figure shows the pusher when it is placed horizontally as a reference, where the XX direction is the far-to-near direction, the YY direction is the front-to-back direction, and the ZZ direction is the top-to-bottom direction or the vertical direction.

[0032] First Embodiment

[0033] See Figure 1 As shown, this embodiment relates to a pusher 100 for an occluder. The pusher 100 includes a handle housing 20 and a sleeve 10 connected to the handle housing 20. The handle housing 20 houses a first drive assembly 30, a core locking assembly 40, a second drive assembly 50, a first locking unit 60, a second locking unit 70, and a rotating assembly 90.

[0034] See Figure 2-4The structure of the actuator 100 is further explained below. The handle housing 20 includes an upper housing 21 and a lower housing 22, whose inner cavities together form a receiving cavity 201. This receiving cavity 201 is used to house the first drive assembly 30, the core rod locking assembly 40, the second drive assembly 50, the first locking unit 60, the second locking unit 70, and the rotating assembly 90. The sleeve connector 80 is slidably disposed in the receiving cavity 201. The proximal end of the sleeve 10 enters the receiving cavity 201 from the outside and is fixedly connected to the sleeve connector 80. The core rod 11 is slidably disposed in the sleeve 10, and its proximal end is connected to the handle housing 20. The first drive assembly 30 is disposed in the receiving cavity 201 and is lockably or releaseably connected to the sleeve connector 80. The first drive assembly 30 can drive the sleeve connector 80 to slide axially. The second drive assembly 50 is disposed in the receiving cavity 201 and is lockably or releaseably connected to the sleeve connector 80. The second drive assembly 50 can drive the sleeve connector 80 to slide axially.

[0035] The rotating assembly 90 includes a first rotating part 91, a second rotating part 92, and a slide rod 93. The first rotating part 91 and the second rotating part 92 are rotatably and axially limitedly connected to the handle housing 20, allowing rotation within the receiving portion 201 but preventing axial movement relative to the handle housing 20. The first rotating part 91 is located near the proximal end of the second rotating part 92. The slide rod 93 includes two axially extending and side-by-side slide rod units, which pass through the second rotating part 92 and are inserted into the first rotating part 91. Rotating the first rotating part 91 causes the slide rod 93 to rotate, and the rotation of the slide rod 93 causes the second rotating part 92 to rotate about its axis within the receiving portion 201. In this embodiment, since the first rotating part 91 and the second rotating part 92 are rotatably connected to the handle housing 20, their primary purpose is to achieve the rotatable connection between the slide rod 93 and the handle housing 20.

[0036] The first transmission unit 30 includes a roller 31, a screw 32, and a slider 33. The screw 32 is a rod-shaped structure with external threads and a locking groove 321 at its distal end. The roller 31 has an internal thread that engages with the external thread of the screw 32, and is helically sleeved around the outer circumference of the screw 32. A roller mounting portion 203 is provided in the receiving cavity 201, and the roller 31 is axially limited and mounted in the roller mounting portion 203. The roller 31 can rotate relative to the handle housing 20 but cannot move axially. For ease of operation, at least a portion of the roller 31 is exposed outside the receiving cavity 201, allowing the roller 31 to be pushed to rotate from outside the receiving cavity 201. The slider 33 is fixedly connected to the proximal end of the screw 32, and a sleeve connector 80 is connected to the distal end. The handle housing 20's receiving cavity 201 is also provided with a first slide rail 205 and a second slide rail 204. The sleeve connector 80 is slidably mounted on the first slide rail 205, and the slider 33 is slidably mounted on the second slide rail 204. The screw 32 is connected to the sleeve connector 80 via a first locking unit 60 to achieve relative locking or releasing between the first drive assembly 30 and the sleeve connector 80. In this application, locking refers to two objects being in a fixed state, moving together as a whole. Releasing refers to the two objects being released after unlocking, no longer moving together, and the movement of one object not causing the movement of the other. When the screw 32 and the sleeve connector 80 are locked, the roller 31 is axially limited. Rotating the roller 31 drives the screw 32 to move axially within the receiving cavity 201, thereby causing the sleeve connector 80 and the slider 33 to slide along the first slide rail 205 and the second slide rail 204 respectively. A transition joint 12 is provided at the distal end of the handle housing 20. The transition joint 12 is used to reduce the stress at the connection between the sleeve 10 and the handle housing 20. The proximal end of the sleeve 20 passes through the transition joint 12 and is fixedly connected to the sleeve connector 80, which drives the sleeve 20 to move axially. The sleeve connector 80 includes a main body 82 and a connecting part 81. Exemplarily, the main body 82 is a block structure, which is used to connect to the screw 32 and slide on the second slide rail 204, while the connecting part 81 is a columnar structure connected to the distal side of the main body 82, which is used to fixally connect to the sleeve 10. A connecting hole is provided on the connecting part 81, and the connecting part 81 is fixedly connected to the sleeve 20 by a first screw 58.

[0037] The second transmission unit 50 includes a translation component 51, a first rack 52, a gear 53, a second rack 54, and a connecting rod 55. A slide rod 93 passes through the translation component 51, and the translation component 51 is slidably connected to the slide rod 93. The translation component 51 can slide on the slide rod 93 but cannot rotate relative to it; when the slide rod 93 rotates, it drives the translation component 51 to rotate as well. The first rack 52 is slidably disposed axially on one side of the receiving cavity 201, and its proximal end is fixedly connected to the push component 51. The second rack 54 is slidably disposed axially on the other side of the receiving cavity 201, and has a rack groove 541 extending along the axis. Therefore, in this embodiment, the first rack 52 and the second rack 54 are slidably disposed axially on both sides of the receiving cavity 201 and are slidably connected to the handle housing 20. A gear mounting part 202 is provided within the receiving cavity 201. A gear 53 is rotatably mounted on the gear mounting part 202 and positioned between the first rack 52 and the second rack 54. The radial sides of the gear 53 mesh with the first rack 52 and the second rack 54, respectively, meaning the gear 53 transmits the force and motion between the first rack 52 and the second rack 54. Since the first rack 52 and the second rack 54 are located on opposite sides of the gear 53, the direction of movement of the first rack 52 is opposite to that of the second rack 54. For example, when the first rack 52 slides distally, it will cause the second rack 54 to slide proximally. The distal end of the second rack 54 is connected to the connecting rod 55 via a second locking unit 70. For the connecting rod 55, its proximally connected to the second rack 54 via the second locking unit 70, and its distal end fixedly connected to the sleeve connector 80 via a second screw 57. When the connecting rod 55 and the second rack 54 are locked, the translation component 51 is pulled backward (towards the proximal end). The translation component 51 will cause the first rack 52 to slide backward. The sliding of the first rack 52 will cause the gear 53 to rotate, which will in turn cause the second rack 54 to slide forward. This will then push the sleeve joint 24 forward through the connecting rod 55, thus causing the sleeve 20 to move axially toward the distal end.

[0038] The core rod 11 is slidably inserted into the sleeve 10, and its proximal end passes sequentially through the first transmission member 30 and the core rod locking assembly 40 to be fixedly connected to the translation assembly 51 of the second transmission assembly 50. When the translation assembly 51 slides axially, it can drive the core rod 11 to slide relative to the sleeve 10. When the translation assembly 51 rotates about the axial direction, it can drive the core rod 11 to rotate about the axis in the sleeve 10.

[0039] See Figure 2 , 5 The structure of the first locking unit 60 is described below. See also... Figure 2As shown, the first locking unit 60 is a screw-shaped structure, including a threaded rod 61 and a knob 62 located at one end of the threaded rod 61. The threaded rod 61 has external threads on its outer side. The main body 82 of the sleeve connector 80 has an inner cavity, and a locking threaded hole 83 that engages with the external threads of the threaded rod 61 is provided on the rear end face of the main body 82. The locking threaded hole 83 is a through hole that extends from the rear end face to communicate with the inner cavity of the main body 82. The distal end of the screw 32 can be inserted into the inner cavity of the main body 82, and the locking groove 321 on the screw 32 can be aligned with the locking threaded hole 83. The threaded rod 61 is screwed into the locking threaded hole 83. When the threaded rod 61 is rotated so that its free end is inserted into the locking groove 321, the first locking unit 60 locks the screw 32 and the sleeve joint 80, and the two are in a locked state. When the threaded rod 61 is rotated in the opposite direction so that its free end is disengaged from the locking groove 321, the first locking unit 60 unlocks the screw 32 and the sleeve joint 80, and the two are in a released state.

[0040] In other embodiments, the locking groove may not be provided. In this case, when the distal end of the threaded rod 61 directly abuts against the screw 32 and applies a compressive force, the screw 32 and the sleeve joint 80 can also be locked.

[0041] See Figure 6 The structure of connecting rod 55 is described below. Connecting rod 55 includes an intermediate rod 552, with a distal connecting portion 553 at the distal end and a proximal connecting portion 551 at the proximal end. In this embodiment, both the distal connecting portion 553 and the proximal connecting portion 551 are plate-shaped or sheet-shaped. In other embodiments, they can be other shapes, such as rod-shaped. Their shapes are not specifically limited, as long as they can achieve the connecting function. The proximal connecting portion 551 has a locking through hole 554, which penetrates the upper and lower end faces of the proximal connecting portion 551 and is elongated, with its length dimension greater than its width dimension. A connecting rod connecting hole 555 is provided on the distal connecting portion 553. A second screw 57 passes through the connecting rod connecting hole 555 and is screwed into the sleeve joint 80, thereby achieving a fixed connection between the connecting rod 55 and the sleeve joint 80.

[0042] See Figure 7aAs shown, the second locking unit 70 includes a locking rod 72, with an upper limit block 73 and a lower limit block 74 spaced axially on the outer periphery of the locking rod 72. The upper limit block 73 is a block-shaped structure, mirror-symmetrically arranged on both sides of the locking rod 72 about a plane P1 passing through the axis of the locking rod 72. The upper limit block 73 includes a horizontally arranged upper surface 731 and an inclined lower surface 732. The lower inclined surface 732 is inclined radially outward towards the first upper surface 731, meaning that the further the first lower inclined surface 732 is from the center of the locking rod 72 radially, the closer it is to the first upper surface 731, thus causing the thickness of the upper limit block to gradually decrease in the direction away from the locking rod 72. The lower limit block 74 has the same shape as the upper limit block 73, and is mirror-symmetrical with the upper limit block 73 about a plane P2 perpendicular to the axis of the locking rod 72. The lower limit block 74 has an upper inclined surface 742 and a horizontally arranged lower surface 741, wherein the upper inclined surface 742 and the lower inclined surface 732 are arranged opposite to each other. Since the upper inclined surface 742 and the lower inclined surface 732 are arranged opposite to each other, the distance between the lower inclined surface 732 and the upper inclined surface 742 along the axis of the locking rod 72 gradually increases from d1 to d2 in the radial outward direction of the locking rod 72.

[0043] See Figure 7bThe diagram shows the structure of the second locking unit 70 in the released state. During actual installation, the lower limit block 74 passes sequentially through the locking through hole 554 of the connecting rod 55 and the rack groove 541 of the second rack 54, reaching the lower end face of the second rack 54. This positions the connecting rod 55 and the second rack 54 between the upper limit block 73 and the lower limit block 74, respectively. When the second locking unit 70 is in the released state, the upper limit block 73 is aligned with the elongated locking through hole 554 along its length, while the lower limit block 74 is aligned with the rack groove 541 along its length. At this time, the second locking rod unit 70 can move freely up and down along its axial direction, and the second locking unit 70 does not limit the connecting rod 55 and the second rack 54. To prevent the second locking unit 70 from sliding downwards under gravity and causing the upper limit block 73 to disengage from the locking through hole 554, a housing protrusion 22a is provided in the cavity of the lower housing 22. The housing protrusion 22a abuts against the lower end face of the lower limit block 74 to restrict the movement of the second locking unit 70. In this embodiment, the minimum distance d1 between the upper limit block 73 and the lower limit block along the axial direction of the locking rod 72 is less than the thickness D of the connecting rod 55 and the second rack 54, while the maximum distance d2 between the upper limit block 73 and the lower limit block along the axial direction of the locking rod 72 is greater than the thickness D of the connecting rod 55 and the second rack 54. Therefore, when the second locking unit 70 is in the released state, the side of the lower inclined surface 732 of the upper limit block 73 near the locking rod 72 is located in the locking through hole 554, while the side away from the locking rod 72 is located outside the locking through hole 554, with a gap between it and the upper side of the connecting rod 55. The side of the lower inclined surface 742 of the lower limit block 74 near the locking rod 72 is located in the rack groove 541, while the side away from the locking rod 72 is located outside the rack groove 541, with a gap between it and the lower side of the second rack 54. The existence of the above gaps facilitates the rotation of the second locking rod unit 70 relative to the connecting rod 55 and the second rack 54 around the axial direction of the locking rod.

[0044] See Figure 7cThe diagram shows the structure of the second locking unit 70 in the locked state. When it is necessary to lock the connecting rod 55 and the second rack 54, the locking rod 72 is rotated by the hand-held part 71. During the rotation, the side of the lower inclined surface 732 of the upper limit block 73 near the locking rod 72 gradually disengages from the locking through hole 554 and comes into contact with the upper end face of the connecting rod 55. Meanwhile, the side of the lower inclined surface 742 of the lower limit block 74 near the locking rod 72 gradually disengages from the rack groove 541 and comes into contact with the lower end face of the second rack 54. Since the minimum distance d1 between the upper limit block 73 and the lower limit block along the axial direction of the locking rod 72 is less than the thickness D of the proximal connecting part 551 of the connecting rod 55 and the second rack 54, the upper limit block 73 and the lower limit block 74 clamp the connecting rod 55 and the second rack 54 located between them, thereby fixing the connecting rod 55 and the second rack 54 to each other and locking them in the locked state. In this embodiment, the upper limit block 73 and the lower limit block 74 have rectangular cross-sections that are perpendicular to the axial direction of the locking rod 72. When the upper limit block 73 has a rectangular cross-section, the locking through hole 554 is also set to a rectangular shape that matches the cross-section of the upper limit block 73. The width of the locking through hole 554 is greater than or equal to the width of the upper limit block 73 but less than its length, and its length is greater than or equal to the length of the upper limit block 73. With the above settings, when the upper limit block 73 is aligned with the locking through hole 564, it can be accommodated in the locking through hole 564. When the upper limit block 73 rotates a certain angle, such as 90 degrees, and is misaligned with the locking through hole 564, the upper limit block 73 will span across the locking through hole 564 and abut against the connecting rod 55. Of course, in other embodiments, the cross-sectional shape of the upper limit block and the locking through hole is not limited to rectangles; it can also be elliptical, trapezoidal, or other non-centrally rotationally symmetrical shapes to ensure that the upper limit block can span across the locking through hole after rotating a certain angle.

[0045] See Figure 8-9The structure of the core rod locking assembly 40 is described below. The core rod locking assembly 40 includes a fixed base 43, a movable member 44, a clamp 42, and a locking wheel 41. The clamp 42 is used to adjust the gap between the movable member 44 and the fixed base 43, thereby locking or releasing the core rod 11. The fixed base 43 is axially confined within the receiving cavity 201 of the handle housing 20, while the movable member 44 is movably connected to the fixed base 43, with a gap between them. The core rod 11 passes through this gap between the fixed base 43 and the movable member 44. The locking wheel 41 has an internal thread and is rotatably connected to the handle housing 20 but axially confined within the receiving cavity 201. The clamp 42 includes a clamp portion 421 and a protrusion 422. The protrusion 422 is connected to the proximal side of the clamp portion 421, and its outer periphery is provided with an external thread that engages with the internal thread of the locking wheel 41. The clamping sleeve 421 is fitted onto the movable member 44 and the fixed seat 43. Rotating the locking wheel 41 can drive the clamping sleeve 421 to move axially, thereby clamping or releasing the fixed seat 43 and the movable member 44, and locking or releasing the core rod 11 that passes through the gap between the movable member 43 and the fixed seat 44. The diameter of the smallest inscribed circle of the projection of the clamping sleeve 421 onto a cross-section perpendicular to the axial direction is smaller than the diameter of the largest circumscribed circle of the fixed seat 43 and the movable member 44. This ensures that when the clamping sleeve 421 moves axially relative to the fixed seat 43 and the movable member 44, it can clamp the fixed seat 43 and the movable member 44 together to form a clamping force on the core rod 11, thereby locking the core rod 11 and preventing it from sliding further relative to the handle housing 20.

[0046] See Figure 10 The structure of the translation assembly 51 is described below. The translation assembly 51 includes a core rod mounting base 512, a translation member 511 connected to the core rod mounting base 512, and a translation member cover 513. The core rod mounting base 512 is slidably mounted on the slide rod 93, and the proximal end of the core rod 11 is fixed to the core rod mounting base 512. The translation member 511 is at least partially exposed in the handle housing 20 to push the core rod mounting base 512 along the slide rod 93. The translation member 511 and the translation member cover 513 are rotatably mounted on the outer periphery of the core rod mounting base 512 after being fixed by a third screw 514. The translation member 511 can rotate relative to the core rod mounting base 512 but cannot slide axially. When the translation member 511 slides along the slide rod 93, it drives the core rod mounting base 512 to reciprocate axially, thereby causing the core rod 11 to slide axially. When the second rotating part 91 rotates, it drives the slide rod 93 to rotate, and the rotation of the slide rod 93 drives the core rod mounting base 512 to rotate, thereby causing the core rod 11 to rotate around the axis. The second rotating part 92 is provided to support the slide rod 93 to facilitate its rotation relative to the housing 20.

[0047] See Figure 11The structure of the occluder 200 is described below. The occluder 200 includes a distal circlip 210 and a proximal circlip 220 connected to each other. A distal end cap 230 is provided at the end of the distal circlip 210, and a proximal end cap 240 is provided at the end of the proximal circlip 220. The distal end cap 230 is fixedly connected to a locking member 250. The free end of the locking member 240 has an internal thread, while the outer periphery of the proximal end cap 240 has an external thread. The distal end cap 230 is connected to the external thread of the mandrel 11 via the internally threaded locking member 250. The proximal end cap 240 has an external thread that mates with the internal thread at the distal end of the sleeve 10, thereby achieving a threaded connection between the mandrel 11 and the distal circlip 210, and a threaded connection between the sleeve 10 and the proximal circlip 220. When releasing or retrieving the occluder 200, simply rotating the sleeve 10 and the mandrel 11 is sufficient to release or establish the connection with the occluder 200. In this embodiment, the occluder 200 is a non-self-expanding occluder, which can be made of absorbable polymer materials, such as polylactic acid. Because absorbable occluders have poor self-expanding properties, they cannot recover their shape through elastic recovery after the restriction is lifted. Therefore, it is necessary to pull the distal mesh 210 and the proximal mesh 220 to achieve their contraction or expansion. Specifically, when the proximal end cap 240 and the distal end cap 230 move away from each other, the proximal mesh 220 and the distal mesh 210 will elongate axially and decrease radially, thus contracting into a long strip shape; when the proximal end cap 240 and the distal end cap 230 move closer to each other, the proximal mesh 220 and the distal mesh 210 will shorten axially and increase radially, thus expanding into a disc shape. The pusher 100, when connected to the occluder 200, constitutes a pusher system.

[0048] The operation of the pusher 100 of the present invention will be described below. In this invention, the core tube 11 is fixedly connected to the distal end cap 230 of the distal mesh disk 210, and the sleeve 10 is fixedly connected to the proximal end cap 240 of the proximal mesh disk 220. The pusher adjusts the relative movement of the core tube 11 and the sleeve 10 to achieve the relative movement of the proximal end cap 240 and the distal end cap 230, thereby forming the proximal mesh disk 220 and the distal mesh disk 210. Before the occluder 200 is released, the proximal end cap 240 and the distal end cap 230 are far apart, and the occluder 100 is elongated and gathered in the delivery sheath (not shown in the figure). After the occluder 100 is released from the delivery sheath, the pusher causes the proximal end cap 240 and the distal end cap 230 to move closer together and gradually form a disc shape. In this embodiment, the first driving component 30 is connected to the sleeve joint 80 via the first locking unit 60. When the first locking unit 60 is locked, the first driving component 30 can drive the sleeve 10 to move axially. Additionally, the second driving component 50 is also connected to the sleeve joint 80 via the second locking unit 70. When the second locking unit 70 is locked, the second driving component 50 can also drive the sleeve 10 to move axially. Therefore, the driving mode of the sleeve joint 80 can be selected by locking or releasing the first locking unit 60 or the second locking unit 70. The first locking unit 60 and the second locking unit 70 cannot be locked simultaneously. Furthermore, since the second driving component 50 is always fixedly connected to the core rod 11, the aforementioned locking state has no effect on its movement.

[0049] Specifically, the pusher 100 can achieve three molding methods for the plugger 200.

[0050] The first molding method involves first molding the distal mesh disc 210, and then pulling the proximal mesh disc 220 to form it. Specifically, during the procedure, the second locking unit 70 is released, while the first locking unit 60 can be either released or locked (without needing to operate the first locking unit). At this time, the translation component 51 of the second drive group 50 will not drive the cannula connector 80 to move. According to the common method for implanting the occluder 100, the delivery sheath is delivered to the defect location, the distal mesh disc 210 is pushed out of the delivery sheath and placed in the left atrium / left ventricle, while the proximal mesh disc 220 remains in the delivery sheath. Keeping the pusher as a whole stationary, the translation component 51 is moved proximally, and the translation component 51 drives the core rod 11 to move proximally. The core rod 11 drives the distal end cap 230 to move closer to the proximal end cap 240, thereby forming the distal mesh disc 210. After the distal mesh disc 210 is formed, the entire delivery sheath and pusher 100 are moved to bring the distal mesh disc 210 closer to the septal defect, and then the proximal mesh disc 220 is pushed out of the delivery sheath in the right atrium / right ventricle. At this time, the pusher 100 is kept stationary, and the translation component 51 continues to move proximally. The translation component 51, through the core rod 80, pulls the distal end cap 230 to move closer to the proximal end cap 240, thereby forming the proximal end cap.

[0051] For the first molding method, it is only necessary to keep pushing the translation component 51 towards the near end, which is simple to operate and has a low error rate.

[0052] The second molding method involves first molding the distal mesh disc 210, and then pushing the proximal mesh disc 220 to be molded. Specifically, during the procedure, the second locking unit 70 is released while the first locking unit 60 is locked. At this time, the first drive group 30 drives the cannula connector 80 to move. According to the common method of implanting the occluder 100, the delivery sheath is delivered to the defect location, the distal mesh disc 210 is pushed out of the delivery sheath and placed in the left atrium / left ventricle, and the proximal mesh disc 220 remains in the delivery sheath. Keeping the pusher as a whole stationary, the translation component 51 is moved proximally. The translation component 51 drives the core rod 11 to move proximally, and the core rod 11 drives the distal end cap 230 to move closer to the proximal end cap 240. This allows for the formation of the distal endovascular disc 210. After the distal endovascular disc 210 is formed, the entire delivery sheath and pusher 100 are moved to bring the distal endovascular disc 210 closer to the septal defect. Then, the proximal endovascular disc 220 is pushed out of the delivery sheath in the right atrium / right ventricle. The locking wheel 41 is rotated to lock the core rod 11, at which point the core rod 11 cannot move relative to the pusher. Keeping the pusher 100 stationary, the roller 31 is rotated to push the cannula connector 80 distally. At this time, the cannula connector 80 will drive the proximal end cap 240 closer to the distal end cap 230, thereby forming the proximal endovascular disc 220.

[0053] In the second molding method, the molding of the distal and proximal mesh discs is controlled step-by-step by different components. The position of the mesh discs can be adjusted according to actual clinical needs, and the molding process of the mesh discs can be controlled.

[0054] In the third forming method, the distal mesh plate 210 and the proximal mesh plate 220 are formed simultaneously. Specifically, the second locking unit 70 is locked, while the first locking unit 60 is released. At this time, the translation component 51 will push the cannula connector 80 to move. The occluder 100 is pushed out of the delivery sheath, and the waist of the occluder 100 is positioned at the defect location, while the distal mesh plate 210 and the proximal mesh plate 220 are located on both sides of the atrial septal defect or ventricular septal defect, respectively. The translation component 51 is pushed proximally, at which time the translation component 51 will directly pull the core rod 11 to move proximally. In addition, since the second locking unit 70 is locked at this time, the movement of the translation component 51 to the proximal end is converted by the first rack 52, gear 53 and the second rack 54, which will push the connecting rod 55 to move distally, thereby driving the cannula connector 80 and the cannula 10 to move distally. At this time, the core rod 11 pulls the distal end cap 230 to the proximal end, and the sleeve 20 simultaneously pushes the proximal end cap 240 to the distal end, so that the distal end cap 230 and the proximal end cap 240 move at the same time and move closer to each other, so as to achieve the simultaneous forming of the two mesh discs.

[0055] As for the third molding method, since the distal and proximal meshes are molded simultaneously, the occluder has a good shape after molding and the molding efficiency is high, which can shorten the operation time.

[0056] The embodiments described above are merely examples of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the scope of protection of the present invention. The scope of protection of this patent should be determined by the appended claims.

Claims

1. A pusher for a occluder, characterized in that, include: The handle housing has an internal receiving cavity; A sleeve connector is slidably disposed within the receiving cavity; A first drive assembly is disposed in the receiving cavity and is lockably or releaseably connected to the sleeve joint. The first drive assembly can drive the sleeve joint to slide axially. A second drive assembly is disposed in the receiving cavity and is lockably or releasably connected to the sleeve joint. The second drive assembly can drive the sleeve joint to slide axially. A sleeve extends axially, with its proximal end fixedly connected to the sleeve joint. The core rod is slidably inserted inside the sleeve, and its proximal end is fixedly connected to the second drive assembly.

2. The pusher according to claim 1, characterized in that, The first drive assembly includes a screw and a roller. The distal end of the screw is connected to the sleeve joint via a first locking unit. The roller is sleeved on the outer periphery of the screw for threaded connection, and the roller is axially confined within the receiving cavity.

3. The pusher according to claim 2, characterized in that, A slider is also fixedly connected to the near end of the screw, and the slider is slidably connected to the handle housing.

4. The pusher according to claim 2, characterized in that, The sleeve connector has an inner cavity extending through its proximal and distal ends and is provided with a locking threaded hole communicating with the inner cavity. The distal end of the screw can extend into the inner cavity. The first locking unit includes a threaded rod that can be screwed into or out of the locking threaded hole and abut against or move away from the screw.

5. The pusher according to claim 2, characterized in that, The sleeve connector has an inner cavity extending through its proximal and distal ends and is provided with a locking threaded hole communicating with the inner cavity. The distal end of the screw can extend into the inner cavity. The first locking unit includes a threaded rod that can be screwed into or out of the locking threaded hole. The distal sidewall of the screw has a locking groove, and the end of the threaded rod can extend into or retract from the locking groove.

6. The pusher according to claim 1, characterized in that, The second drive assembly includes a translation component, a first rack, a gear, a second rack, and a connecting rod. The proximal end of the core rod is fixedly connected to the translation component, the proximal end of the first rack is fixedly connected to the translation component, the gear is located between the first rack and the second rack and meshes with both of them simultaneously, and the distal end of the connecting rod is fixedly connected to the sleeve joint, while the proximal end is connected to the second rack via a second locking unit.

7. The pusher according to claim 6, characterized in that, The second rack has a rack groove extending axially, and the proximal end of the connecting rod is provided with an elongated locking through hole; the second locking unit has a locking rod and an upper limit block and a lower limit block spaced apart on the locking rod, the upper limit block having a lower inclined surface, the lower inclined surface causing the thickness of the upper limit block to gradually decrease in the direction away from the locking rod; the lower limit block having an upper inclined surface opposite to the lower inclined surface, the upper inclined surface causing the thickness of the lower limit block to gradually decrease in the direction away from the locking rod; the lower limit block passes through the rack groove and the locking through hole in sequence, such that the connecting rod and the second rack are located between the upper limit block and the lower limit block; the minimum distance between the upper and lower inclined surfaces along the axial direction of the locking rod is less than the sum of the thicknesses of the connecting rod and the second rack, while the maximum distance is greater than the sum of the thicknesses of the connecting rod and the second rack.

8. The pusher according to claim 7, characterized in that, The connecting rod includes an intermediate rod; the intermediate rod has a distal connecting part on its distal end and a proximal connecting part on its proximal end, the distal connecting part being connected to the sleeve joint, and the locking through hole being disposed on the proximal connecting part.

9. The pusher according to claim 6, characterized in that, The translation assembly includes a translation component and a core rod mounting base. The proximal end of the core rod is fixedly connected to the core rod mounting base. The translation component is connected to the core rod mounting base, and the translation component can push the core rod mounting base to reciprocate axially.

10. A pusher system, comprising the pusher according to any one of claims 1-9, characterized in that, Also includes: An occluder comprising a distal network disk and a proximal network disk connected to each other, wherein the distal network disk has a distal end cap and the proximal network disk has a proximal end cap; The core rod is detachably connected to the distal end cap, and the sleeve is detachably connected to the proximal end cap.

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