Interventional medical instrument delivery system

Abstract

The application provides an interventional medical instrument pusher and an interventional medical instrument delivery system. The interventional medical instrument pusher comprises a push cable and a push handle which is slidably sleeved on the push cable; the push handle comprises a frame and a locking piece arranged in the frame; the locking piece moves relative to the frame so that the push handle locks or releases the push cable. The interventional medical instrument delivery system comprises the interventional medical instrument pusher. The interventional medical instrument pusher and the interventional medical instrument delivery system can facilitate pushing, improve the pushing speed and save the operation time.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and in particular to an interventional medical device delivery system. Background Technology

[0002] Minimally invasive interventional surgery is becoming increasingly widespread in clinical applications. The delivery system for endovascular interventional medical devices (such as left atrial appendage occluders, vascular plugs, and filters) typically includes several parts: a delivery device, a dilator, a loader, and a pusher. The delivery device consists of a delivery sheath and a sheath holder. First, a channel is established using the delivery sheath and dilator. Then, the dilator is withdrawn, and the interventional medical device is loaded into the loader via the pusher. Next, the sheath holder is connected to the loader, and the interventional medical device is guided into the delivery sheath via the pusher until it is delivered to the target location.

[0003] Existing delivery devices typically consist of a flexible steel cable and a delivery handle fixed to the proximal end of the cable. The distal end of the cable is detachably connected to the interventional medical device to be delivered. During most of the delivery process, from the initial push to when the interventional medical device is close to the target location, the cable length between the handle and the loader inlet is relatively long, the handle is far from the loader inlet, and the cable is flexible. Pushing the cable through the handle only causes the cable to bend, and the pushing force cannot be effectively transmitted. In other words, the handle of existing delivery devices is practically ineffective during most of the delivery process; the operator can only push by pinching the cable near the loader inlet. However, the cable diameter is small, making pinching inconvenient and limiting the cable delivery speed, thus prolonging the operation time and increasing the surgical risk. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide an interventional medical device pusher and an interventional medical device delivery system that, in view of the deficiencies of the prior art, can facilitate pushing, improve pushing speed, and save surgical time.

[0005] To address the aforementioned technical problems, the present invention first provides an interventional medical device pusher, including a push cable and a push handle slidably sleeved on the push cable; the push handle includes a frame and a locking fastener disposed within the frame, the locking fastener moving relative to the frame to lock or release the push cable.

[0006] The present invention also provides an interventional medical device delivery system, including a delivery unit, a loader, and an interventional medical device pusher. The delivery unit includes a sheath, the loader includes a loading tube connected to the proximal end of the sheath, and the interventional medical device pusher includes a push cable and a push handle slidably sleeved on the push cable. The push handle includes a frame and a locking fastener disposed within the frame. The locking fastener moves relative to the frame to lock or release the push cable. The push cable in the interventional medical device pusher is movably inserted through the loading tube and the sheath.

[0007] The interventional medical device pusher and delivery system provided by this invention include a push handle comprising a frame and a locking fastener disposed within the frame. The locking fastener moves relative to the frame to lock or unlock the push cable. During the push of the interventional medical device, the operator is allowed to repeatedly perform the following actions: using the push handle to lock the push cable, using the push handle to push the push cable, using the push handle to unlock the push cable, sliding the push handle to a suitable position on the push cable, and using the push handle to lock the push cable again. This ensures that the push handle relative to the push cable can always be conveniently adjusted to a position suitable for the operator's grip and for easy pushing of the push cable by the operator. The pushing force of the push handle on the push cable is effectively transmitted. Therefore, the interventional medical device pusher and delivery system of this invention facilitates push, significantly improves push speed, and saves surgical time. Attached Figure Description

[0008] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0009] Figure 1 This is a schematic diagram of the structure of the interventional medical device delivery system provided in the first embodiment of the present invention. The interventional medical device delivery system includes a delivery device, an expander, a loader, a hemostatic valve, and an interventional medical device pusher.

[0010] Figure 2 yes Figure 1 A three-dimensional structural diagram of the push handle of the interventional medical device pusher.

[0011] Figure 3 yes Figure 2 A three-dimensional structural diagram of the push handle from another perspective.

[0012] Figure 4 yes Figure 2 A cross-sectional view of the push handle in the image.

[0013] Figure 5 yes Figure 1 A schematic diagram of the usage status of an interventional medical device pusher.

[0014] Figure 6 yes Figure 5 A partial sectional view.

[0015] Figure 7 yes Figure 1 A partial cross-sectional view of another usage state of the interventional medical device pusher.

[0016] Figure 8 yes Figure 7 This diagram illustrates another usage state of the interventional medical device pusher.

[0017] Figure 9 yes Figure 1 A schematic diagram of the expansion assembly formed by combining the expander and the conveyor.

[0018] Figure 10 yes Figure 1 A schematic diagram of the structure after the delivery device, loader, and hemostatic valve are connected.

[0019] Figure 11 This is a schematic diagram of the usage state of the interventional medical device delivery system provided in the first embodiment of the present invention.

[0020] Figure 12 This is a schematic diagram of the end face structure of the push handle in the interventional medical device pusher of the interventional medical device delivery system provided in the second embodiment of the present invention.

[0021] Figure 13 yes Figure 12 A sectional view.

[0022] Figure 14 yes Figure 13 A schematic diagram of its breakdown.

[0023] Figure 15 yes Figure 14 A schematic diagram of the end face structure of the locking fastener.

[0024] Figure 16 yes Figure 15 A schematic diagram of the side structure of the locking fastener.

[0025] Figure 17 This is a schematic diagram of the usage state of the interventional medical device pusher provided in the second embodiment of the present invention.

[0026] Figure 18 yes Figure 17 A sectional view.

[0027] Figure 19 This is a schematic diagram of another usage state of the interventional medical device pusher provided in the second embodiment of the present invention.

[0028] Figure 20 yes Figure 19 A sectional view.

[0029] Figure 21 This is a schematic diagram of the structure of the interventional medical device pusher provided in the third embodiment of the present invention. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] Furthermore, the following descriptions of the embodiments are made with reference to the accompanying illustrations, which illustrate specific embodiments in which the invention can be implemented. Directional terms used in this invention, such as "up," "down," "front," "back," "left," "right," "inner," "outer," and "side," are merely directional references to the accompanying illustrations. Therefore, the directional terms used are for better and clearer explanation and understanding of the invention, and are not intended to indicate or imply that the referred device or element must have a specific orientation, or be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on the invention.

[0032] Orientation Definitions: For clarity, during the procedure, the end closer to the operator is referred to as the "proximal end," and the end farther from the operator is referred to as the "distal end." "Axial" refers to the direction parallel to the line connecting the distal and proximal centers of the interventional medical device; "radial" refers to the direction perpendicular to the aforementioned axial direction. These definitions are for ease of description only and should not be construed as limiting the invention.

[0033] Please see Figure 1This invention provides an interventional medical device delivery system 100, comprising a delivery device 20, a dilator 40, a loader 60, a hemostatic valve 70, and an interventional medical device pusher 80. The delivery device 20 includes a sheath 22 and a sheath seat 25 connected to the proximal end of the sheath 22. The dilator 40 includes an dilator rod 42 and a connecting portion 45 connected to the proximal end of the dilator rod 42. The dilator rod 42 is movably inserted into the sheath 22, and the connecting portion 45 is detachably connected to the proximal end of the sheath seat 25. The loader 60 includes a loading tube 62, a first connector 64 disposed at the distal end of the loading tube 62, and a second connector 66 disposed at the proximal end of the loading tube 62; the first connector 64 of the loader 60 is connected to the proximal end of the sheath seat 25, and the second connector 66 is connected to the hemostatic valve 70. An interventional medical device pusher 80 is used to push interventional medical devices. It includes a pusher cable 82 and a pusher handle 83 slidably mounted on the pusher cable 82. The pusher cable 82 is preferably, but not limited to, a flexible steel cable. The pusher handle 83 includes a frame 85 and a locking fastener 87 disposed within the frame 85. The locking fastener 87 moves relative to the frame 85 to lock or release the pusher handle 83 onto the pusher cable 82. Therefore, the pusher handle 85 can be locked onto the pusher cable 82 or slide on it. When the pusher handle 83 is locked in a suitable position on the pusher cable 82, it allows the operator to easily hold the pusher handle 83 and push the pusher cable 82. When the pusher handle 83 is released from locking the pusher cable 82, it allows the pusher handle 83 to easily slide on the pusher cable 82 and adjust to a suitable position. The suitable position refers to a position where, during surgery, the pusher handle 83 is easy for the operator to hold and for the operator to push the pusher cable 82 using the pusher handle 83. At the appropriate position, the push handle 83 is close to the proximal end of the loading tube 62, and the pushing force of the push handle 83 on the push cable 82 can be effectively transmitted.

[0034] The interventional medical device pusher 80 of the present invention allows the operator to repeatedly perform the following actions during the pushing process of the interventional medical device: locking the push cable 82 with the push handle 83, pushing the push cable 82 with the push handle 83, unlocking the push cable 82 with the push handle 83, sliding the push handle 83 to a suitable position on the push cable 82, and locking the push cable 82 again with the push handle 83. This ensures that the push handle 83 relative to the push cable 82 can always be conveniently adjusted to a position suitable for the operator's grip and for the operator to push the push cable 82 through the push handle 83. The pushing force of the push handle 83 on the push cable 82 is effectively transmitted. Therefore, the interventional medical device pusher 80 of the present invention can facilitate pushing, significantly improve the pushing speed, and save surgical time.

[0035] Please refer to the following: Figures 2-4The frame 85 includes a base 850, which includes a rectangular base plate 8501, two support plates 8502 disposed on the base plate 8501 and spaced apart from each other, and two end plates 8503. The two support plates 8502 protrude from opposite sides of the base plate 8501, and the two end plates 8503 protrude from the other opposite sides of the base plate 8501 and are connected between the two support plates 8502. A pair of through holes 8504 are formed on the two end plates 8503, which are close to the upper surface of the base plate 8501. The diameter of the through holes 8504 is slightly larger than the diameter of the push cable 82, so that the push cable 82 can be slidably inserted into the pair of through holes 8504 and slidably mounted between the two support plates 8502, and the push cable 82 is supported by the upper surface of the base plate 8501. A substrate 8501, two support plates 8502, and two end plates 8503 form a receiving space 852. The upper surface of the substrate 8501 refers to the surface of the substrate 8501 facing the receiving space 852. Rolling and / or sliding the locking fastener 87 causes the locking fastener 87 to move relative to the substrate 8501 in a direction not parallel to the axial direction of the push cable 82 and approach the substrate 8501, so that the push cable 82 is locked between the locking fastener 87 and the substrate 8501, thereby locking the push handle 83 with the push cable 82.

[0036] In this embodiment, the base 850 is made of materials such as nylon, rubber or plastic. After the locking fastener 87 locks the push cable 82 with the base plate 8501, even if the push cable 82 is subjected to pushing resistance, the push cable 82 and the push handle 83 remain relatively stationary due to the static friction between the push cable 82, the locking fastener 87 and the base plate 8501 in the pushing direction. That is, the push handle 83 is fixed on the push cable 82.

[0037] The base 850 also includes an anti-slip pad 854, which is attached to the upper surface of the substrate 8501. The anti-slip pad 854 increases the static friction between itself and the push cable 82. When the push cable 82 is locked, the anti-slip pad 854 further increases the friction, preventing the push cable 82 from sliding. Specifically, the substrate 8501 has a receiving groove 8506, and the anti-slip pad 854 is received in the receiving groove 8506. The upper surface of the anti-slip pad 854 is flush with or slightly higher than the upper surface of the substrate 8501. The anti-slip pad 854 can be a silicone pad or a rubber pad, etc.

[0038] In other embodiments, the upper surface of the substrate 8501 may be textured or grooved or roughened to increase the friction between the push cable 82 and the upper surface of the substrate 8501, further solidifying the locking effect and effectively preventing the push cable 82 from sliding.

[0039] A pair of guide grooves 8507 are formed on the two support plates 8502. In a direction not parallel to the axial direction of the push cable 82, the pair of guide grooves 8507 extend from the side away from the base plate 8501 toward the side closer to the base plate 8501. The locking fastener 87 includes a locking portion 872 located between the two support plates 8502, and a connecting shaft 874 protruding from the locking portion 872. The two ends of the connecting shaft 874 away from the locking portion 872 are respectively inserted into the pair of guide grooves 8507, and the connecting shaft 874 can roll and / or slide within the pair of guide grooves 8507.

[0040] In this embodiment, the locking part 872 is a cylindrical locking wheel. At least one guide groove 8507 is provided with a limiting hook 8508 near the end of the substrate 8501, and the connecting shaft 874, which is housed in the guide groove 8507, is provided with locking teeth that engage with the limiting hook 8508. When the locking wheel is rolled and / or slid to the end of the guide groove 8507 near the substrate 8501, the locking teeth of the connecting shaft 874 engage the limiting hook 8508, and the push cable 82 is locked between the locking wheel and the substrate 8501.

[0041] Specifically, in one embodiment, the guide groove 8507 is generally arc-shaped. The guide groove 8507 extends obliquely from the proximal end to the distal end of the substrate 8501 relative to the axial direction of the push cable 82, causing the height of the guide groove 8507 on the support plate 8502 to gradually decrease from the proximal end to the distal end. That is, the distal end of the guide groove 8507 is adjacent to the substrate 8501, and the proximal end is away from the substrate 8501. A limiting hook 8508 is disposed at the distal end of the guide groove 8507. The connecting shaft 874 moves along the proximal end to the distal end of the guide groove 8507, causing the locking wheel to gradually approach the push cable 82 until the push cable 82 is locked. At this time, the locking teeth of the connecting shaft 874 engage with the limiting hook 8508. When the push cable 82 is pushed, the engagement of the locking teeth with the limiting hook 8508 can balance the torque exerted by the static friction on the locking wheel, preventing the locking wheel from reversing and loosening the push cable 82.

[0042] In one embodiment, an anti-slip pad 876 is wrapped around the outer circumferential surface of the locking wheel. In this embodiment, the anti-slip pad 876 is a silicone ring, and the silicone ring is connected to the locking wheel by an interference fit. When the locking wheel locks the push cable 82, the anti-slip pad 876 can increase the static friction between the push cable 82 and the locking part 872, thereby further preventing the push cable 82 from sliding.

[0043] In other embodiments, the outer surface of the locking part 872 may also be textured or grooved or roughened to increase the static friction between the push cable 82 and the outer surface of the locking part 872, further solidify the locking effect, and effectively prevent the push cable 82 from sliding.

[0044] In other embodiments, the guide groove may also extend in a direction perpendicular to the axis of the push cable 82, that is, the guide groove gradually approaches the substrate 8501 in a direction perpendicular to the axis of the push cable 82, that is, perpendicular to the substrate 8501. The locking fastener 87 slides and / or rolls in the guide groove until the locking fastener 87 presses the push cable 82 onto the substrate 8501. Then, the operator can press the locking fastener 87 with their finger to lock the push cable 82. Releasing the pressing of the finger on the locking fastener 87 releases the locking of the push cable 82, and the push handle 83 can slide on the push cable 82. Alternatively, an elastic hook can be provided between the locking fastener 87 and the support plate 8502, so that the locking fastener 87 can be locked onto the support plate 8502 to lock the push cable 82; when the elastic hook is operated to release the locking fastener 87 from the support plate 8502, the locking of the push cable 82 is released, and the push handle 83 can slide on the push cable 82, making it convenient to adjust the push handle 83 to a suitable position on the push cable 82.

[0045] In other embodiments, the guide groove 8507 extends obliquely from the distal end to the proximal end of the substrate 8501 relative to the axial direction of the push cable 82, such that the height of the guide groove 8507 on the support plate 8502 gradually decreases from the distal end to the proximal end, that is, the proximal end of the guide groove 8507 is adjacent to the substrate 8501, and the distal end of the guide groove 8507 is away from the substrate 8501. A limiting hook 8508 is disposed at the proximal end of the guide groove 8507. The connecting shaft 874 moves from the distal end to the proximal end of the guide groove 8507, so that the locking part 872 gradually approaches the push cable 82 until the push cable 82 is locked. At this time, the locking teeth of the connecting shaft 874 engage with the limiting hook 8508.

[0046] Please see Figure 5 and Figure 6 When assembling the push cable 82 and the push handle 83, the locking fastener 87 of the push handle 83 is rolled along the guide groove 8507 to the near end, so that the locking part 872 is away from the base plate 8501; the far end of the push cable 82 is passed through a pair of through holes 8504 from the near end of the base 850. There is no contact between the push cable 82 and the locking fastener 87, and there is no relative force. The push handle 83 is slidably sleeved on the push cable 82 so that the push handle 83 can slide to a position that is easy for the operator to hold.

[0047] Please see Figure 7 and Figure 8When the push cable 82 needs to be pushed by the push handle 83, the locking fastener 87 rolls along the guide groove 8507 from the near end to the far end, so that the anti-slip pad 876 on the locking fastener 87 approaches the push cable 82 until the locking teeth of the connecting shaft 874 engage with the limiting hook 8508. At this time, the push cable 82 is clamped between the anti-slip pad 876 on the locking fastener 87 and the anti-slip pad 854 on the base plate 8501, that is, the push cable 82 is locked, and the push handle 83 is fixed to the push cable 82. At this time, the push cable 82 can be pushed by holding the handle 83, which is convenient to use.

[0048] Please see Figure 9 During the surgery, the dilator 40 needs to be assembled into the delivery unit 20 to form an expansion assembly. Specifically, the dilator rod 42 of the dilator 40 passes sequentially from the proximal end of the delivery unit 20 through the sheath seat 25 and the sheath 22 until the connecting part 45 of the dilator 40 is connected to the proximal end of the sheath seat 25. In this embodiment, the connecting part 45 is connected to the proximal end of the sheath seat 25 by a screw connection.

[0049] Please see Figure 10 After removing the expander 40 from the delivery unit 20, the loader 60 needs to be installed at the proximal end of the delivery unit 20. Specifically, the distal end of the loading tube 62 is inserted into the proximal end of the sheath seat 25, forming a communicating channel between the loading tube 62, the sheath seat 25, and the sheath 22. The first connector 64 of the loader 60 is connected to the sheath seat 25 to secure the loader 60 to the delivery unit 20. A hemostatic valve 70, equipped with a three-way valve, is connected to the proximal end of the loader 60.

[0050] Please see Figure 11 The following example, using a clinical surgical procedure for delivering a left atrial appendage occluder, illustrates the usage of the interventional medical device delivery system 100 of this invention:

[0051] The expansion unit 40 and the conveyor 20 form a connection. Figure 9 The dilator 40 is shown; the dilator 40 is moved along the track established by the guidewire (not shown) from the femoral vein through the interatrial septum to the left atrial appendage, and then the dilator 40 is withdrawn, leaving the sheath 22 in the body to establish a channel from outside to inside the body.

[0052] Connect the hemostatic valve 70 to the loader 60, roll the locking fastener 87 along the guide groove 8507 to the distal end, until the locking teeth of the connecting shaft 874 of the locking fastener 87 are engaged with the limiting hook 8508, lock the push cable 82, hold the push handle 83 and push the distal end of the push cable 82 through the hemostatic valve 70 and the loader 60 in sequence, then detachably connect the distal end of the push cable 82 to the proximal end of the left atrial appendage occluder, and then retract the push cable 82 proximal to allow the left atrial appendage occluder to be retracted into the loading tube 62 of the loader 60;

[0053] The loading tube 62 is threadedly connected to the sheath seat 25, that is, the distal end of the loading tube 62 is inserted from the proximal end of the sheath seat 25, and the first connector 64 is connected to the proximal end of the sheath seat 25 to obtain an interventional medical device delivery system loaded with a left atrial appendage occluder.

[0054] Using the push handle 83, the push cable 82 is pushed distally to deliver the left atrial appendage occluder to the predetermined position in the left atrial appendage and unfold it. During this process, the operator repeatedly performs the following actions: pushing the push cable 82 with the push handle 83, unlocking the push cable 82 with the push handle 83, sliding the push handle 83, adjusting it to a suitable position on the push cable 82, and locking the push cable 82 again with the push handle 83. This ensures that the push handle 83 can always be easily adjusted relative to the push cable 82 to a position suitable for the operator's grip and for easy pushing of the push cable 82 using the push handle 83. The pushing force of the push handle 83 on the push cable 82 is effectively transmitted, making the operation simple, reliable, and efficient. Specifically: holding the push handle 83 with the hand, the thumb operates the locking device 87, first rolling the locking device 87 proximally. Release the locking of the push cable 82, slide the push handle 83 to a suitable position, i.e., a position convenient for the operator to hold, and then use the thumb to operate the locking device 87 to roll along the guide groove 8507 to the far end, so that the locking teeth of the connecting shaft 874 of the locking device 87 engage with the limiting hook 8508, locking the push cable 82. Hold the push handle 83 and push the push cable 82 to the far end until the push handle 83 is close to the proximal end of the loader 60; then release the locking of the push cable 82 again, slide the push handle 83 to the proximal end to a suitable position, lock the push cable 82, hold the push handle 83 and push the push cable 82, and repeat this process until the left atrial appendage occluder is delivered to the predetermined position; furthermore, angiography can be used to assess whether the left atrial appendage occluder has reached the predetermined position, and the position of the left atrial appendage occluder can be adjusted accordingly to reach the predetermined position;

[0055] Disconnect the left atrial appendage occluder from the push cable 82 and release the left atrial appendage occluder.

[0056] Please see Figures 12 to 16The structure of the interventional medical device delivery system provided in the second embodiment of the present invention is similar to that of the first embodiment, except that the structure of the push handle 83a of the interventional medical device delivery system in the second embodiment is different from that of the push handle 83 in the first embodiment. In the second embodiment, the push handle 83a includes a frame and a locking fastener 835 disposed within the frame. The frame includes a base 830 and a rotating cover 837 rotatably connected to one end of the base 830. The locking fastener 835 is disposed between the base 830 and the rotating cover 837. The base 830 has a first axial through hole 8301 axially formed, and the rotating cover 837 has a second axial through hole 8377 corresponding to the first axial through hole 8301. The push cable 82 is slidably inserted into the first axial through hole 8301 and the second axial through hole 8377. The locking device 835 includes a clamp 8352 that is slidably fitted onto the push cable 82. The rotating cover 837 rotates relative to the base 830 and pushes the locking device 835 to move the locking device relative to the base 830, thereby causing the clamp 8352 to elastically deform and lock the push cable 82.

[0057] Specifically, the base 830 is a cylindrical body with an open proximal end and a closed distal end. A cylindrical column 8302 protrudes axially from the inner surface of the distal end of the cylindrical body towards the proximal end, extending to the proximal end face adjacent to the cylindrical body. An annular connecting space 8303 is formed between the outer circumferential surface of the column 8302 and the inner circumferential surface of the cylindrical body, serving to accommodate the rotating cover 837. A first axial through hole 8301 is axially formed in the middle of the column 8302. The first axial through hole 8301 includes a receiving hole 8304 near one end of the rotating cover 837 and an insertion hole 8305 communicating with the distal end of the receiving hole 8304. The inner diameter of the receiving hole 8304 is larger than the inner diameter of the insertion hole 8305, and the inner diameter of the insertion hole 8305 is slightly larger than the diameter of the push cable 82, so that the base 830 can be slidably fitted onto the push cable 82. The near end of the outer peripheral surface of the column 8302 is provided with an external thread 8306, and the rotating cover 837 is screwed onto the external thread 8306.

[0058] The locking fastener 835 also includes a sleeve 8354 slidably fitted onto the push cable 82. A chuck 8352 is connected to one end of the sleeve 8354 near the rotating cover 837. The sleeve 8354 is slidably received within a receiving hole 8304 of the cylinder 8302. When the sleeve 8354 of the locking fastener 835 is inserted into the receiving hole 8304, the chuck 8352 stops at the proximal opening of the receiving hole 8304. The axial length of the sleeve 8354 is less than the axial length of the receiving hole 8304. The chuck 8352 includes at least two elastic clamping blocks 8355, with a radial gap between adjacent elastic clamping blocks 8355. Each elastic clamping block 8355 has an inclined guide surface 8356 near the end of the sleeve 8354, and the diameter of the guide surface 8356 gradually decreases from the proximal end to the distal end. The proximal opening of the receiving hole 8304 is rounded or chamfered. When the rotating cover 837 is rotated to push the chuck 8352 to move distally, the rounded or chamfered corners make it easier for the guide surfaces 8356 of the elastic clamping blocks 8355 to be pressed into the receiving hole 8304, thereby causing each elastic clamping block 8355 to elastically deform and converge. In this embodiment, there are four elastic clamping blocks 8355 of the chuck 8352, which are circumferentially arranged at the proximal end of the sleeve 8354. Each chuck 8352 has a guide surface 8356 at one end facing the sleeve 8354.

[0059] The rotating cover 837 includes a circular cover plate 8371 and a connecting cylinder 8373 disposed around the periphery of the cover plate 8371. The connecting cylinder 8373 is rotatably housed within the connecting space 8303. The inner surface of the distal end of the connecting cylinder 8373 is provided with an internal thread 8375 corresponding to the external thread 8306 of the cylinder 8302. A second axial through hole 8377 is formed in the middle of the cover plate 8371, through which the push cable 82 can slide. An operating lever 8378 is provided on the proximal end face of the cover plate 8371. By swinging the operating lever 8378, the rotating cover 837 can be rotated relative to the base 830.

[0060] When assembling the push handle 83a, insert the sleeve 8354 of the locking fastener 835 into the receiving hole 8304 of the base 830 until the guide surface 8356 of the elastic clamping block 8355 abuts against the proximal opening of the receiving hole 8304; screw the rotating cover 837 onto the column 8302. Specifically, the connecting sleeve 8373 of the rotating cover 837 is received in the connecting space 8303 of the base 830, so that the internal thread 8375 of the rotating cover 837 is screwed onto the external thread 8306 of the column 8302 until the inner surface of the cover plate 8371 approaches the proximal end of the clamp 8352 of the locking fastener 835. At this time, the first axial through hole 8301, the inner cavity of the sleeve 8354, and the second axial through hole 8377 of the cover plate 8371 are connected and coaxial.

[0061] Please refer to the following: Figure 17and Figure 18 In this embodiment, the rotating cover 837 is rotated counterclockwise by the operating lever 8378, so that the cover plate 8371 does not contact the proximal end of the elastic clamp 8355, and the clamp 8352 is in a natural state. The distal end of the push cable 82 is passed from the proximal end of the rotating cover 837 through the second axial through hole 8377 of the cover plate 8371, the clamp 8352, the sleeve 8354, and the first axial through hole 8301 of the base 830, so that the push handle 83a can be slidably sleeved on the push cable 82. At this time, the clamp 8352 does not clamp the push cable 82, that is, there is no relative force between the clamp 8352 and the push cable 82, which makes it convenient for the push handle 83a to slide to a position that is convenient for the operator to hold.

[0062] Please see Figure 19 and Figure 20 When the push cable 82 needs to be pushed by the push handle 83a, first slide the push handle 83a to a suitable position on the push cable 82, and rotate the rotating cover 837 clockwise by the operating rod 8378, so that the cover plate 8371 pushes against the locking fastener 835. The locking fastener 835 moves to the far end relative to the base 830, and the guide surface 8356 is pressed by the receiving hole 8304, so that the elastic clamp 8355 undergoes elastic deformation and the radial gap decreases. The elastic clamps 8355 come together to lock the push cable 82. The push handle 83a is fixed to the push cable 82 as a whole. Holding the push handle 83a allows the push cable 82 to be pushed, which is convenient and reliable.

[0063] The surgical procedure for delivering interventional medical devices, such as a left atrial appendage occluder, using the interventional medical device delivery system provided in the second embodiment of the present invention is similar to that in the first embodiment. However, the specific operational steps of repeatedly using the push handle 83a to push the push cable 82, using the push handle 83a to unlock the push cable 82, sliding the push handle 83a, adjusting it to a suitable position on the push cable 82, and using the push handle 83a again to lock the push cable 82 are different. Specifically: by rotating the rotating cover 837 counterclockwise using the operating lever 8378, the clamp 8352 returns to its natural state, releasing the locking of the push cable 82, and sliding the push handle 83a... Move handle 83 to the appropriate position, then rotate the rotating cover 837 clockwise using operating lever 8378. This causes the elastic clamps 8355 to elastically deform, reducing the radial gap. The elastic clamps 8355 then converge and lock the push cable 82. Hold the push handle 83a and push the push cable 82 towards the distal end until the push handle 83a touches the proximal end of the loader 60. Then release the lock on the push cable 82, slide the push handle 83a towards the proximal end to the appropriate position, lock the push cable 82, and hold the push handle 83a to push the push cable 82. Repeat this process until the left atrial appendage occluder is delivered to the predetermined position. During this process, the push handle 83a can always be easily adjusted relative to the push cable 82 to a position suitable for the operator's grip and for pushing the push cable 82 using the push handle 83a. The pushing force of the push handle 83a on the push cable 82 is effectively transmitted, making the operation simple, reliable, and efficient.

[0064] Please see Figure 21The structure of the interventional medical device delivery system provided in the third embodiment of the present invention is similar to that of the second embodiment, except that the structure of the locking fastener 835a in the third embodiment is different from that in the second embodiment. In this third embodiment, the distal end of the elastic clamp 8355 of the locking fastener 835a is provided with a stop surface 8358 that abuts against the proximal end face of the column 8302, and the proximal end of the elastic clamp 8355 is provided with an inclined guide surface 8359, the diameter of which gradually decreases from the distal end to the proximal end. When the rotating cover 837 pushes against the chuck 8352, the stop surface 8358 prevents the chuck 8352 from moving to the distal end, so that the proximal end of the chuck 8352 can only move relative to the rotating cover 837 to the proximal end. The guide surface 8359 of the proximal end of the elastic clamping block 8355 is pressed into the second axial through hole 8377, so that each elastic clamping block 8355 undergoes elastic deformation and converges. Furthermore, the distal end of the second axial through hole 8377 is rounded or chamfered, which makes it easier for the guide surface 8359 of the elastic clamping block 8355 to be pressed into the second axial through hole 8377. In use, rotating the cover 837 clockwise using the operating lever 8378 moves the locking fastener 835a closer to the end of the cover 837. The guide surface 8359 is pressed against the distal opening of the second axial through hole 8377, causing the elastic clamping block 8355 to elastically deform and the radial gap to decrease. The elastic clamping blocks 8355 then come together to lock the push cable 82, making it easier to hold the push handle 83a and push the push cable 82. When rotating the cover 837 counterclockwise using the operating lever 8378, the cover plate 8371 moves closer to the end away from the elastic clamping block 8355. The distal opening of the second axial through hole 8377 releases the pressure on the guide surface 8359 on the elastic clamping block 8355, allowing the locking fastener 835a to elastically reset and release the locking of the push cable 82, making it easier for the push handle 83a to slide on the push cable 82.

[0065] The above are the embodiments of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the embodiments of the present invention, and these improvements and modifications are also considered to be within the protection scope of the present invention.

Claims

1. An interventional medical device delivery system, characterized in that, The device includes a delivery unit, a loader, and an interventional medical device pusher. The delivery unit includes a sheath, and the loader includes a loading tube connected to the proximal end of the sheath. The interventional medical device pusher includes a push cable and a push handle slidably sleeved on the push cable. The push cable in the interventional medical device pusher is movably inserted into the loading tube and the sheath. The push handle includes a frame and a locking fastener disposed within the frame. The locking fastener moves relative to the frame to lock or release the push cable. The push cable passes through the loader and is detachably connected to the interventional medical device at its distal end. It is then retracted proximally to allow the interventional medical device to be stored in the loading tube of the loader. After the loading tube and a sheath pre-reserved in the body form a communicating channel, the interventional medical device is further pushed along the sheath. During the process of pushing the interventional medical device, the aforementioned medical device pusher allows the operator to repeatedly perform the following actions: locking the push cable with the push handle, pushing the push cable with the push handle, unlocking the push cable with the push handle, sliding the push handle to a suitable position on the push cable, and locking the push cable again with the push handle. This ensures that the push handle relative to the push cable can always be conveniently adjusted to a position suitable for the operator's grip and for the operator to push the push cable using the push handle.

2. The interventional medical device delivery system according to claim 1, characterized in that, The frame includes a base, in which the push cable is slidably threaded. The direction of movement of the locking fastener relative to the base is not parallel to the axial direction of the push cable, such that the locking fastener moves closer to or further away from the push cable to lock or release the push cable.

3. The interventional medical device delivery system according to claim 2, characterized in that, The base includes a base plate and two support plates disposed on the base plate and spaced apart from each other. The push cable is slidably threaded between the two support plates. The locking fastener is connected between the two support plates. Rolling and / or sliding the locking fastener causes the locking fastener to move relative to the base plate in a direction not parallel to the axial direction of the push cable and move closer to the base plate, so that the push cable is locked between the locking fastener and the base plate.

4. The interventional medical device delivery system according to claim 3, characterized in that, A pair of guide grooves are provided on the two support plates; in a direction not parallel to the axial direction of the push cable, the pair of guide grooves extend from the side away from the substrate toward the side closer to the substrate; the locking fastener includes a locking part located between the two support plates and a connecting shaft protruding from the locking part, the two ends of the connecting shaft away from the locking part are respectively inserted into the pair of guide grooves, so that the connecting shaft rolls and / or slides in the pair of guide grooves.

5. The interventional medical device delivery system according to claim 4, characterized in that, The guide groove extends in a direction perpendicular to the axis of the push cable; or the guide groove extends obliquely toward the distal or proximal end of the substrate relative to the axis of the push cable.

6. The interventional medical device delivery system according to claim 4, characterized in that, The locking part is a locking roller, and the locking roller and / or at least a portion of the surface of the substrate are provided with an anti-slip structure.

7. The interventional medical device delivery system according to claim 4, characterized in that, At least one of the guide grooves is provided with a limiting hook near the end of the substrate, and the connecting shaft is provided with a locking tooth that engages with the limiting hook; when the locking tooth engages with the limiting hook, the push cable is locked between the locking part and the substrate.

8. The interventional medical device delivery system according to claim 2, characterized in that, The frame also includes a rotating cover screwed to one end of the base. The locking fastener is disposed between the base and the rotating cover. The locking fastener includes a clamp sleeved on the push cable. The rotating cover rotates and pushes against the locking fastener, causing the locking fastener to move relative to the base in a direction perpendicular to the axial direction of the push cable, thereby causing the clamp to elastically deform and lock the push cable.

9. The interventional medical device delivery system according to claim 8, characterized in that, The base has a first axial through hole, and the rotating cover has a second axial through hole corresponding to the first axial through hole. The push cable is slidably inserted into the first axial through hole and the second axial through hole. The first axial through hole includes a receiving hole near one end of the rotating cover. The locking fastener also includes a sleeve slidably sleeved on the push cable. The clamp is connected to one end of the sleeve near the rotating cover, and the sleeve is received in the receiving hole.

10. The interventional medical device delivery system according to claim 9, characterized in that, The clamp includes at least two elastic clamps with a radial gap between adjacent elastic clamps. An inclined guide surface is provided at one end of the elastic clamp near the sleeve. The rotating cover rotates to push the locking fastener, causing the locking fastener to move relative to the base. The guide surface is pressed by the receiving hole, thereby reducing the radial gap. The elastic clamps converge and lock the push cable.

11. The interventional medical device delivery system according to claim 9, characterized in that, The clamp includes at least two elastic clamps with a radial gap between adjacent elastic clamps. An inclined guide surface is provided at one end of the elastic clamp near the rotating cover. The rotating cover rotates to push the locking fastener, causing the locking fastener to move relative to the rotating cover. The guide surface is pressed by the second axial through hole, thereby reducing the radial gap. The elastic clamps converge and lock the push cable.

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