Pusher for plugging device and system thereof

Abstract

The invention relates to a pusher for a plugging device and a system thereof, and the pusher comprises a handle housing which is internally provided with a containing cavity; the sleeve joint is arranged in the accommodating cavity in a sliding manner; the first driving assembly is arranged in the containing cavity and connected with the sleeve joint in a locking or releasing mode, and the first driving assembly can drive the sleeve joint to slide in the axial direction; the second driving assembly is arranged in the containing cavity and connected with the sleeve joint in a lockable or releasable mode, and the second driving assembly can drive the sleeve joint to slide in the axial direction; the sleeve extends in the axial direction, and the near end of the sleeve is fixedly connected with the sleeve connector; the core rod is slidably arranged in the sleeve in a penetrating mode, and the near end of the core rod is connected with the second driving assembly. The pusher has three plugging device forming modes which can be flexibly selected according to actual requirements, and different requirements of different operation scenes can be met.

Description

Technical Field

[0001] The present invention relates to the field of medical devices, and in particular to a pusher for an occluder and a system thereof. Background Art

[0002] The current common treatment method for cardiovascular diseases is to use catheter technology to intervene. For example, occluders are placed through catheter intervention, such as atrial septal defect (ASD) occluders, ventricular septal defect (VSD) occluders, patent ductus arteriosus (PDA) occluders, patent foramen ovale (PFO) occluders, etc., to reach the defect site of the heart and block the defect to treat heart disease.

[0003] Traditional occluders are mainly made of metal. Although they can effectively treat heart defects, their permanent presence in the patient's body may cause long-term complications such as abrasion, allergies, and conduction block. The absorbable occluder can be gradually absorbed by the human body after completing the treatment task, thus avoiding the above complications. Because the absorbable occluder does not have the excellent memory recovery performance of the metal occluder, a pusher is required to control the molding of the occluder during the implantation process. The existing pushers have a single molding method for the occluder, which is difficult to meet different clinical needs. Summary of the invention

[0004] Based on this, it is necessary to provide a pusher for an occluder to address the above problems, comprising: a handle housing having a receiving cavity therein;

[0005] A sleeve joint is slidably disposed in the accommodating cavity; a first drive component is disposed in the accommodating cavity, and is lockably or releasably connected to the sleeve joint, and the first drive component can drive the sleeve joint to slide axially; a second drive component is disposed in the accommodating cavity, and is lockably or releasably connected to the sleeve joint, and the second drive component can drive the sleeve joint to slide axially; a sleeve extends axially, and a proximal end of the sleeve is fixedly connected to the sleeve joint; a core rod is slidably penetrated in the sleeve, and a proximal end of the core rod is fixedly connected to the second drive component.

[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 circumference of the screw to be threadedly connected thereto, and the axial limit of the roller is located within the accommodating cavity.

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

[0008] Furthermore, the sleeve joint has an inner cavity running through its proximal and distal ends and is provided with a locking threaded hole connected to the inner cavity, the distal end of the screw rod can extend into the inner cavity, and the first locking unit includes a threaded rod, which can be screwed into or out of the locking threaded hole and abut against or away from the screw rod.

[0009] Furthermore, the sleeve joint has an inner cavity running through its proximal and distal ends and is provided with a locking threaded hole connected to the inner cavity, the distal end of the screw rod can be inserted into the inner cavity, the first locking unit includes a threaded rod, the threaded rod can be screwed into or out of the locking threaded hole, the distal side wall of the screw rod has a locking groove, and the end of the threaded rod can be inserted into or out of the locking groove.

[0010] Furthermore, the second drive assembly includes a translation assembly, a first rack, a gear, a second rack and a connecting rod, the proximal side of the core rod is fixedly connected to the translation assembly, the proximal side of the first rack is fixedly connected to the translation assembly, the gear is located between the first rack and the second rack and meshes with both at the same time; the distal side of the connecting rod is fixedly connected to the sleeve joint, and the proximal side is connected to the second rack through a second locking unit.

[0011] Furthermore, the second rack has a rack groove extending in the axial direction, and a long locking through hole is provided on the proximal side of the connecting rod; the second locking unit has a locking rod and an upper limit block and a lower limit block arranged at intervals on the locking rod, the upper limit block has a lower inclined surface, and the lower inclined surface makes the thickness of the upper limit block gradually decrease along the direction away from the locking rod; the lower limit block has an upper inclined surface arranged opposite to the lower inclined surface, and the upper inclined surface makes the thickness of the lower limit block gradually decrease along 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, and 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; a distal connecting portion is provided on the distal side of the intermediate rod, and a proximal connecting portion is provided on the proximal side, the distal connecting portion is connected to the sleeve joint, and the locking through hole is provided on the proximal connecting portion.

[0013] Further, the translation assembly includes a translation member and a core rod mounting seat, the proximal side of the core rod is fixedly connected to the core rod mounting seat, the translation is connected to the core rod mounting seat, and the translation member can push the core rod mounting seat to reciprocate axially.

[0014] The present application also relates to a pusher system, including the aforementioned pusher, and also includes: an occluder, the occluder includes a distal mesh disk and a proximal mesh disk connected to each other, the distal mesh disk has a distal head, and the proximal mesh disk has a proximal head; the core rod is detachably connected to the distal head, and the sleeve is detachably connected to the proximal head.

[0015] The technical solution of the present invention has the following beneficial effects: the pusher for the occluder adopted by the present invention has three different molding methods for the occluder, and one of the occluder 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. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0017] Figure 2 This is the exploded structure diagram of the pusher;

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

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

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

[0021] Figure 6 It is the three-dimensional structure diagram of the connecting rod;

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

[0023] Figure 7b is a structural diagram of the second locking unit in a released state;

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

[0025] Figure 8 This is a diagram of the other parts of the pusher after removing the upper shell;

[0026] Fig. 9 It is the structural diagram related to the core rod locking part;

[0027] Fig.10 This is the structural diagram related to the translation component;

[0028] Fig.11 This is the structural diagram of the occluder; DETAILED DESCRIPTION

[0029] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific implementation disclosed below.

[0030] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may also be a centered element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a centered element at the same time. The terms "upper", "lower", "left", "right" and similar expressions used to indicate orientation as used herein are for illustrative purposes only and are not intended to be the only implementation method. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by technicians in the technical field of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific implementation methods and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0031] It should be noted that for medical devices, the end of the medical device that is relatively close to the operator is generally called the "proximal end", and the end of the medical device that is relatively far from the operator is called the "distal end". Based on this principle, the "proximal end" and "distal end" of any component of the delivery system are defined, where "proximal end" and "distal end" are only used to describe the orientation, and do not only refer to the end face of the proximal end or the end face of the distal end; "axial" or "longitudinal axis" refers to the direction parallel to the line connecting the distal center and the proximal center of the medical device; "radial" or "transverse" refers to the direction perpendicular to the axial direction. The specific orientation is determined by Figure 2 The figure shows that the pusher is placed horizontally as a reference, wherein the XX direction is the distal-proximal direction, the YY direction is the front-rear direction, and the ZZ direction is the upper-lower direction or the vertical direction.

[0032] First embodiment

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

[0034] See also Figure 2-4As shown, the structure of the pusher 100 is further described. The handle housing 20 includes an upper housing 21 and a lower housing 22, and the inner cavity of the two cooperates to form a receiving chamber 201 of the handle housing. The receiving chamber 201 is used to receive 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 joint 80 is slidably arranged in the receiving chamber 201, the proximal side of the sleeve 10 enters the receiving chamber 201 from the outside and is fixedly connected to the sleeve joint 80, and the core rod 11 is slidably penetrated in the sleeve 10 and its proximal end is connected to the handle housing 20. The first drive assembly 30 is arranged in the receiving chamber 201, and it can be locked or released to the sleeve joint 80, and the first drive assembly 30 can drive the sleeve joint 80 to slide along the axial direction; the second drive assembly 50 is arranged in the receiving chamber 201, and it can be locked or released to the sleeve joint 80, and the second drive assembly 50 can drive the sleeve joint 80 to slide along the axial direction.

[0035] As for the rotating assembly 90, it includes a first rotating part 91, a second rotating part 92 and a sliding rod 93. The first rotating part 91 and the second rotating part 92 are connected to the handle housing 20 in a rotational and axially limited manner, and can rotate in the receiving part 201 but cannot move axially relative to the handle housing 20. The first rotating part 91 is located at the proximal side of the second rotating part 92. The sliding rod 93 includes two sliding rod units extending axially and arranged side by side, and the two sliding rod units pass through the second rotating part 92 and are inserted into the first rotating part 91. Rotating the first rotating part 91 will drive the sliding rod 93 to rotate, and the rotation of the sliding rod 93 will drive the second rotating part 92 to rotate around the axis in the receiving part 201. In this embodiment, since the first rotating part 91 and the second rotating part 92 are rotationally connected to the handle housing 20, the first rotating part 91 and the second rotating part 92 are provided mainly to realize the rotational connection between the sliding rod 93 and the handle housing 20.

[0036] As for the first transmission part 30, it includes a roller 31, a screw 32, and a slider 33. Among them, the screw 32 is a rod-shaped structure with an external thread, and has a locking groove 321 on its distal side. The roller 31 has an internal thread that meshes with the external thread of the screw 32, and its spiral sleeve is entangled on the outer periphery of the screw 32. A roller mounting portion 203 is provided in the receiving chamber 201, and the roller 31 is axially limitedly mounted in the roller mounting portion 203. The roller 31 can rotate relative to the handle housing 20 but cannot move axially. For the convenience of operation, at least part of the roller 31 is exposed to the receiving chamber 201, and then the roller 31 can be pushed to rotate outside the receiving chamber 201. The proximal side of the screw 32 is fixedly connected with the slider 33, and the distal side is connected with the sleeve joint 80. The receiving chamber 201 of the handle housing 20 is also provided with a first slide rail 205 and a second slide rail 204, the sleeve joint 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 rod 32 is connected to the sleeve joint 80 through the first locking unit 60 to achieve relative locking or release of the first drive assembly 30 and the sleeve joint 80. The locking in this application refers to the two objects being in a fixed state at this time, and the two objects are linked together as a whole. The release in this application refers to the release of the fixed connection between the two objects after unlocking, and the two objects are no longer linked, and the movement of one object will not drive the movement of the other object. When the screw rod 32 and the sleeve joint 80 are in a locked state, since the roller 31 is limited in the axial direction, rotating the roller 31 will drive the screw rod 32 to move axially in the receiving chamber 201, thereby driving the sleeve joint 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 also provided at the distal end of the handle housing 20, and 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 joint 80, and the sleeve 20 is driven to move axially through the sleeve joint 80. Among them, the sleeve joint 80 includes a main body 82 and a connecting portion 81. Exemplarily, the main body 82 is a block structure, which is used to be connected to the screw rod 32 and is slidably arranged on the second slide rail 204, and the connecting portion 81 is a columnar structure connected to the distal side of the main body 82, which is used to be fixedly connected to the sleeve 10. A connecting hole is provided on the connecting portion 81, and the fixed connection between the connecting portion 81 and the sleeve 20 is achieved by the first screw 58.

[0037] As for the second transmission part 50, it includes a translation assembly 51, a first rack 52, a gear 53, a second rack 54, and a connecting rod 55. Among them, the slide bar 93 passes through the translation assembly 51, and the translation assembly 51 is slidably connected to the slide bar 93. The translation assembly 51 can slide on the slide bar 93 but cannot rotate relative to it. When the slide bar 93 rotates, it will drive the translation assembly 51 to rotate together. The first rack 52 is slidably arranged on one side of the receiving cavity 201 along the axial direction, and its proximal side is fixedly connected to the pushing assembly 51. The second rack 54 is slidably arranged on the other side of the receiving cavity 201 along the axial direction, and it has a rack groove 541 extending along the axis. Therefore, in this embodiment, the first rack 52 and the second rack 54 are slidably arranged on both sides of the receiving cavity 201 along the axis, and are slidably connected to the handle housing 20. A gear mounting portion 202 is provided in the receiving cavity 201, and a gear 53 is rotatably mounted on the gear mounting portion 202 and is located between the first rack 52 and the second rack 54. The radial sides of the gear 53 are respectively meshed with the first rack 52 and the second rack 54, that is, the gear 53 is used to transmit the force and movement between the first rack 52 and the second rack 54. Since the first rack 52 and the second rack 54 are located on both sides of the gear 53, the movement direction of the first rack 52 is opposite to the movement direction of the second rack 54. For example, when the first rack 52 slides toward the distal end, it will drive the second rack 54 to slide toward the proximal end. Among them, the distal side of the second rack 54 is connected to the connecting rod 55 through the second locking unit 70. For the connecting rod 55, its proximal side is connected to the second rack 54 through the second locking unit 70, and the distal side is fixedly connected to the sleeve joint 80 through the second screw 57. When the connecting rod 55 and the second rack 54 are in a locked state, the translation assembly 51 is pulled backward (proximal side), and the translation assembly 51 will drive the first rack 52 to slide backward. The sliding of the first rack 52 will drive the gear 53 to rotate, and then drive the second rack 54 to slide forward, and then push the sleeve joint 24 to slide forward through the connecting rod 55, so that the sleeve 20 can be driven to move axially toward the distal side.

[0038] As for the core rod 11, it is inserted into the sleeve 10 in a sliding manner, and its proximal end passes through the first transmission member 30 and the core rod locking assembly 40 in sequence and is fixedly connected with the translation assembly 51 of the second transmission assembly 50. When the translation assembly 51 slides along the axial direction, the core rod 11 can be driven to slide relatively in the sleeve 10. When the translation assembly 51 rotates around the axial direction, the core rod 11 can be driven to rotate around the axis in the sleeve 10.

[0039] See also Figure 2 , 5 As shown in FIG. 1 , the structure of the first locking unit 60 is described. Figure 2As shown, the first locking unit 60 is a screw-shaped structure as a whole, including a threaded rod 61 and a knob 62 arranged at one end of the threaded rod 61, and an external thread is provided on the outer side of the threaded rod 61. Among them, the main body 82 of the sleeve joint 80 has an inner cavity, and the rear end surface of the main body 82 is provided with a locking threaded hole 83 that engages with the external thread of the threaded rod 61. The locking threaded hole 83 is a through hole, which extends from the rear end surface 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 set 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 rod 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 rod 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 rod 32 and applies a squeezing force thereto, the screw rod 32 and the sleeve joint 80 can also be locked.

[0041] See also Figure 6 As shown, the structure of the connecting rod 55 is described. The connecting rod 55 includes an intermediate rod 552, a distal connecting portion 553 is provided on the distal side of the intermediate rod 552, and a proximal connecting portion 551 is provided on the proximal side. In this embodiment, the distal connecting portion 553 and the proximal connecting portion 551 are both configured in a plate shape or a sheet shape. In other embodiments, they can be configured in other shapes, such as a rod shape, and their shapes are not specifically limited as long as they can achieve the connection function. A locking through hole 554 is provided on the proximal connecting portion 551, and the locking through hole 554 passes through the upper and lower end surfaces of the proximal connecting portion 551, and is in a long strip shape, and its length direction dimension is greater than the width direction dimension. A connecting rod connecting hole 555 is provided on the distal connecting portion 553. The second screw 57 passes through the connecting rod connecting hole 555 and is screwed with the sleeve joint 80, thereby realizing the fixed connection between the connecting rod 55 and the sleeve joint 80.

[0042] See also Figure 7aAs shown, the second locking unit 70 includes a locking rod 72, and an upper limit block 73 and a lower limit block 74 are arranged on the outer periphery of the locking rod 72 along the axial direction thereof. The upper limit block 73 is a block structure, and is arranged on both sides of the locking rod 72 in a mirror-symmetrical manner with respect to a plane P1 passing through the axis of the locking rod 72. The upper limit block 73 includes a horizontally arranged upper side surface 731 and an inclined lower inclined surface 732, and the lower inclined surface 732 is inclined toward the first upper side surface 731 in the radially outward direction of the locking rod 72, that is, the farther the first lower inclined surface 732 is from the center of the locking rod 72 in the radial direction, the closer it is to the first upper side surface 731, so that the thickness of the upper limit block gradually decreases in the direction away from the locking rod 72. As for the lower limit block 74, its shape is the same as that of the upper limit block 73, and it is mirror-symmetrical with the upper limit block 73 with respect to a plane P2 perpendicular to the axial direction of the locking rod 72. The lower limit block 74 has an upper inclined surface 742 and a horizontally arranged lower side surface 741, wherein the upper inclined surface 742 is arranged opposite to the lower inclined surface 732. Since the upper inclined surface 742 is arranged opposite to the lower inclined surface 732, 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 along the radial outward direction of the locking rod 72.

[0043] See also Figure 7bThe figure shows the structure of the second locking unit 70 in the released state. In the actual installation process, the lower limit block 74 passes through the locking through hole 554 of the connecting rod 55 and the rack groove 541 of the second rack 54 in sequence and reaches the lower end surface of the second rack 54, so that the connecting rod 55 and the second rack 54 are respectively located between the upper limit block 73 and the lower limit block 74. When the second locking unit 70 is in the released state, the upper limit block 73 is aligned with the long strip-shaped locking through hole 554 in the length direction, and the lower limit block 74 is aligned with the rack groove 541 in the length direction. At this time, the second locking rod unit 70 can freely move 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. In order to prevent the second locking unit 70 from sliding downward at will under the action of gravity and causing the upper limit block 73 to be disengaged from the locking through hole 554, a housing protrusion 22a is provided in the cavity of the lower housing 22, and the housing protrusion 22a abuts against the lower end surface of the lower limit block 74 to limit 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 smaller than the thickness D of the connecting rod 55 and the second rack 54, and 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 larger than the thickness D of the connecting rod 55 and the second rack 54. Therefore, when the second locking unit 70 is in a released state, the side of the lower inclined surface 732 of the upper limit block 73 close to the locking rod 72 is located in the locking through hole 554, and 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 surface of the connecting rod 55; the side of the lower inclined surface 742 of the lower limit block 74 close to the locking rod 72 is located in the rack groove 541, and the side away from the locking rod 72 is located outside the rack groove 541, with a gap between it and the lower side surface of the second rack 54. The existence of the above gap facilitates the axial rotation of the second locking rod unit 70 relative to the connecting rod 55 and the second rack 54 around the locking rod.

[0044] See also Figure 7cAs shown, it is a structural diagram of the second locking unit 70 in a locked state. When the connecting rod 55 needs to be locked with the second rack 54, the locking rod 72 is driven to rotate by the hand-held portion 71. During the rotation process, the side of the lower inclined surface 732 of the upper limit block 73 close to the locking rod 72 will gradually disengage from the locking through hole 554 and turn to abut against the upper end surface of the connecting rod 55, while the side of the lower inclined surface 742 of the lower limit block 74 close to the locking rod 72 will gradually disengage from the rack groove 541 and turn to abut against the lower end surface 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 portion 551 of the connecting rod 55 and the second rack 54, the upper limit block 73 and the lower limit block 74 will clamp the connecting rod 55 and the second rack 54 located therebetween, so that the connecting rod 55 and the second rack 54 are fixed to each other and are in a locked state. In this embodiment, the cross-section of the upper limit block 73 and the lower limit block 74 is a rectangular cross-section, which is a cross-section perpendicular to the axial direction of the locking rod 72. When the cross-section of the upper limit block 73 is a rectangular cross-section, the locking through hole 554 is also set to a rectangular shape matching the cross-section of the upper limit block 73, and the width of the locking through hole 554 is greater than or equal to the width of the upper limit block 73 and less than its length, and its length is greater than or equal to the length of the upper limit block 73. Through the above arrangement, 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 cross over 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 a rectangle, and can also be an ellipse, a trapezoid, or other non-central rotational symmetry, so as to ensure that the upper limit block can cross over the locking through hole after rotating a certain angle.

[0045] See also Figure 8-9As shown, the structure of the core rod locking assembly 40 is described. The core rod locking assembly 40 includes a fixed seat 43, a movable member 44, a hoop 42 and a locking wheel 41. Among them, the hoop 42 is used to adjust the gap between the movable member 44 and the fixed seat 43, and the core rod 11 is locked or released by adjusting the size of the gap. The fixed seat 43 is axially limited in the receiving cavity 201 of the handle housing 20, and the movable member 44 is movably connected to the fixed seat 43, and there is a gap between the two. The core rod 11 passes through the fixed seat 43 and the movable member 44 along the gap. The locking wheel 41 has an internal thread, which is rotatably connected to the handle housing 20 but axially limited in the receiving cavity 201. The hoop 42 includes a hoop portion 421 and a protrusion 422, and the protrusion 422 is connected to the proximal side of the hoop portion 421, and its outer periphery is provided with an external thread that meshes with the internal thread of the locking wheel 41. The ferrule portion 421 is sleeved on the movable member 44 and the fixed seat 43. The rotating lock wheel 41 can drive the ferrule portion 421 to move axially to tighten or release the fixed seat 43 and the movable member 44, thereby locking or releasing the core rod 11 passing through the gap between the movable member 43 and the fixed seat 44. The diameter of the minimum inscribed circle of the projection of the ferrule portion 421 on the cross section perpendicular to the axial direction is smaller than the diameter of the maximum circumscribed circle of the fixed seat 43 and the movable member 44, so that when the ferrule portion 421 moves axially relative to the fixed seat 43 and the movable member 44, the fixed seat 43 and the movable member 44 can be tightened together to form a clamping force on the core rod 11, thereby locking the core rod 11 so that it cannot continue to slide relative to the handle housing 20.

[0046] See also Fig.10 As shown, the structure of the translation assembly 51 is described. The translation assembly 51 includes a core rod mounting seat 512, a translation member 511 connected to the core rod mounting seat 512, and a translation member upper cover 513. The core rod mounting seat 512 is slidably mounted on the slide bar 93, and the proximal end of the core rod 11 is fixed to the core rod mounting seat 512. The translation member 511 is at least partially exposed from the handle housing 20 so as to push the core rod mounting seat 512 to move along the slide bar 93. The translation member 511 and the translation member upper cover 513 are fixed by a third screw 514 and then rotatably mounted on the outer periphery of the core rod mounting seat 512. Among them, the translation member 511 can rotate relative to the core rod mounting seat 512 but cannot slide axially. When the translation member 511 slides along the slide bar 93, it can drive the core rod mounting seat 512 to reciprocate along the axial direction, thereby driving the core rod 11 to slide along the axial direction; when the second rotating part 91 rotates, it will drive the slide bar 93 to rotate, and the rotation of the slide bar 93 will drive the core rod mounting seat 512 to rotate, thereby driving the core rod 11 to rotate around the axis. The second rotating part 92 is provided to support the slide bar 93 so as to facilitate its rotation relative to the housing 20.

[0047] See also Fig.11As shown, the structure of the occluder 200 is described. The occluder 200 includes a distal mesh disk 210 and a proximal mesh disk 220 connected to each other. A distal end cap 230 is provided at the end of the distal mesh disk 210, and a proximal end cap 240 is provided at the end of the proximal mesh disk 220. The distal end cap 230 is fixedly connected to a locking member 250, and 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 core rod 11 through the locking member 250 with an internal thread, and the proximal end cap 240 is provided with an external thread that cooperates with the internal thread provided at the distal end of the sleeve 10, so as to realize the threaded connection between the core rod 11 and the distal mesh disk 210, and the sleeve 10 and the proximal mesh disk 220. When releasing or recovering the occluder 200, it is only necessary to rotate the sleeve 10 and the core rod 11 to release or establish the connection with the occluder 200. The occluder 200 in this embodiment is a non-self-expanding occluder, which can be made of an absorbable polymer material, such as polylactic acid. Since the absorbable occluder has poor self-expanding performance, it cannot restore its shape through its own elastic recovery after the restriction is released, so it is necessary to pull the distal mesh disk 210 and the proximal mesh disk 220 to achieve its folding or unfolding. Specifically, when the proximal head 240 and the distal head 230 are away from each other, the proximal mesh disk 220 and the distal mesh disk 210 will be axially elongated and radially reduced, and then folded in a long strip; when the proximal head 240 and the distal head 230 are close to each other, the proximal mesh disk 220 and the distal mesh disk 210 will be axially shortened and radially enlarged, and then unfolded in a disc shape. Among them, the pusher 100 and the occluder 200 are connected to form a pusher system.

[0048] The working method of the pusher 100 of the present invention is described below. In the present 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 relative movement of the core tube 11 and the sleeve 10 is adjusted by the pusher to achieve the relative movement of the proximal end cap 240 and the distal end cap 230, thereby achieving the molding of 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 will move away from each other, and the occluder 100 will be folded in the delivery sheath (not shown in the figure) in a long strip shape. After the occluder 100 is released from the delivery sheath, the proximal end cap 240 and the distal end cap 230 are gradually formed by the pusher to restore the disc shape. In this embodiment, the first drive assembly 30 is connected to the sleeve joint 80 through the first locking unit 60. When the first locking unit 60 is locked, the first drive assembly 30 can drive the sleeve 10 to move axially. In addition, the second drive assembly 50 is also connected to the sleeve joint 80 through the second locking unit 70. When the second locking unit 70 is locked, the second drive assembly 50 can also drive the sleeve 10 to move axially. Therefore, the drive 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 in the locked state at the same time. In addition, since the second drive assembly 50 is always fixedly connected to the core rod 11, the above-mentioned locking state has no effect on its movement.

[0049] Specifically, the pusher 100 can realize three molding methods of the occluder 200 .

[0050] The first molding method is to first mold the distal mesh disk 210, and then pull the proximal mesh disk 220 to mold. Specifically, during the operation, the second locking unit 70 is released, and the first locking unit 60 can be released or locked (without operating the first locking unit). At this time, the translation component 51 of the second drive group 50 will not drive the sleeve joint 80 to move; according to the common method of implanting the occluder 100, the delivery sheath is delivered to the defect position, the distal mesh disk 210 is pushed out of the delivery sheath and placed in the left atrium / left ventricle, and the proximal mesh disk 220 is retained in the delivery sheath; keep the pusher as a whole stationary, move the translation component 51 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 toward the proximal end cap 240, thereby realizing the molding of the distal mesh disk 210; after the distal mesh disk 210 is formed, the delivery sheath and the pusher 100 are moved as a whole, so that the distal mesh disk 210 is close to the septal defect, and then the proximal mesh disk 220 is pushed out of the delivery sheath in the right atrium / right ventricle; at this time, the pusher 100 is kept stationary as a whole, and the translation assembly 51 is continued to be moved proximally, and the translation assembly 51 will pull the distal end cap 230 through the core rod 80 to continue to move toward the proximal end cap 240, thereby realizing the molding of the proximal end cap.

[0051] For the first forming method, it is only necessary to push the translation assembly 51 toward the proximal end, which is simple to operate and has a low error rate.

[0052] The second molding method is to first mold the distal mesh disk 210, and then push the proximal mesh disk 220 to mold. Specifically, during the operation, the second locking unit 70 is released, and the first locking unit 60 is locked. At this time, the first drive group 30 will drive the sleeve joint 80 to move; according to the common method of implanting the occluder 100, the delivery sheath is delivered to the defect position, the distal mesh disk 210 is pushed out of the delivery sheath and placed in the left atrium / left ventricle, and the proximal mesh disk 220 is retained in the delivery sheath; keep the pusher as a whole stationary, move the translation assembly 51 proximally, the translation assembly 51 drives the core rod 11 to move proximally, and the core rod 11 drives the distal end cap 230 to move in the direction close to the proximal end cap 240 , and then the molding of the absorbable distal mesh disk 210 can be achieved; after the distal mesh disk 210 is formed, the delivery sheath and the pusher 100 are moved as a whole, so that the distal mesh disk 210 is close to the septal defect, and then the proximal mesh disk 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, and the core rod 11 cannot move relative to the pusher; the pusher 100 is kept stationary as a whole, and the roller 31 is rotated to push the sleeve joint 80 toward the distal end, and the sleeve joint 80 will drive the proximal head 240 to approach the distal head 230, thereby realizing the molding of the proximal mesh disk 220.

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

[0054] The third molding method is that the distal mesh disk 210 and the proximal mesh disk 220 are molded at the same time. Specifically, the second locking unit 70 is locked, and the first locking unit 60 is released, at which time the translation assembly 51 will push the sleeve joint 80 to move. The occluder 100 is pushed out of the delivery sheath, and the waist of the occluder 100 is located at the defect position, while the distal mesh disk 210 and the proximal mesh disk 220 are respectively located on both sides of the atrial septal defect or the ventricular septal defect; the translation assembly 51 is pushed proximally, and at this time the translation assembly 51 will directly pull the core rod 11 to move proximally. In addition, since the second locking unit 70 is in a locked state at this time, the proximal movement of the translation assembly 51 will push the connecting rod 55 to move distally after being converted by the first rack 52, the gear 53 and the second rack 54, thereby driving the sleeve joint 80 and the sleeve 10 to move distally. At this time, the core rod 11 pulls the distal end cap 230 to move proximally, and the sleeve 20 simultaneously pushes the proximal end cap 240 to move distally, so that the distal end cap 230 and the proximal end cap 240 move simultaneously and approach each other, so as to realize the simultaneous molding of two mesh disks.

[0055] For the third molding method, since the distal mesh disk and the proximal mesh disk are molded at the same time, the occluder has a good shape after molding and the molding efficiency is high, which can shorten the operation time.

[0056] The above-mentioned embodiments only express several implementation methods of the present invention, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the invention patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. The protection scope of the patent of the present invention shall be based on the attached claims.

Claims

1. A pusher for an occluder, characterized in that: include: A handle housing having a receiving cavity therein; A sleeve joint, slidably disposed in the receiving cavity; A first driving assembly is disposed in the receiving cavity and is connected to the sleeve joint in a lockable or releasable manner. The first driving assembly can drive the sleeve joint to slide axially; A second driving assembly is disposed in the receiving cavity and is lockably or releasably connected to the sleeve joint. The second driving assembly can drive the sleeve joint to slide axially; A sleeve extending in the axial direction, with a proximal end fixedly connected to the sleeve joint; The core rod is slidably arranged in the sleeve, and the proximal end of the core rod is fixedly connected to the second driving assembly.

2. The pusher according to claim 1, characterized in that: The first driving 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 circumference of the screw to be threadedly connected thereto, and the axial limit of the roller is located within the receiving cavity.

3. The pusher according to claim 2, characterized in that: The proximal end of the screw rod is also fixedly connected with a sliding block, and the sliding block is slidably connected with the handle housing.

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

5. The pusher according to claim 2, characterized in that: The sleeve joint has an inner cavity running through its proximal and distal ends and is provided with a locking threaded hole connected to the inner cavity, the distal end of the screw rod can extend into the inner cavity, the first locking unit includes a threaded rod, the threaded rod can be screwed into or out of the locking threaded hole, the distal side wall of the screw rod has a locking groove, and the end of the threaded rod can extend into or out of the locking groove.

6. The pusher according to claim 1, characterized in that: The second drive assembly includes a translation assembly, a first rack, a gear, a second rack and a connecting rod. The proximal side of the core rod is fixedly connected to the translation assembly, the proximal side of the first rack is fixedly connected to the translation assembly, the gear is located between the first rack and the second rack and meshes with both of them at the same time; the distal side of the connecting rod is fixedly connected to the sleeve joint, and the proximal side is connected to the second rack through a second locking unit.

7. The pusher according to claim 6, characterized in that: The second rack has a rack groove extending in the axial direction, and a long locking through hole is arranged on the proximal side of the connecting rod; the second locking unit has a locking rod and an upper limit block and a lower limit block arranged at intervals on the locking rod, the upper limit block has a lower inclined surface, and the lower inclined surface makes the thickness of the upper limit block gradually decrease along the direction away from the locking rod; the lower limit block has an upper inclined surface arranged opposite to the lower inclined surface, and the upper inclined surface makes the thickness of the lower limit block gradually decrease along 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, and 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 comprises an intermediate rod; a distal connecting portion is arranged on the distal end side of the intermediate rod, and a proximal connecting portion is arranged on the proximal end side; the distal connecting portion is connected to the sleeve joint, and the locking through hole is arranged on the proximal connecting portion.

9. The pusher according to claim 6, characterized in that: The translation assembly includes a translation member and a core rod mounting seat. The proximal end side of the core rod is fixedly connected to the core rod mounting seat. The translation member is connected to the core rod mounting seat. The translation member can push the core rod mounting seat to reciprocate along the axial direction.

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

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