Sheath movement structure for medical instrument conveyor, handle assembly, and conveyor

Abstract

This utility model discloses a sheath movement structure, handle assembly, and conveyor for a medical device delivery device, comprising: a retraction drive assembly, including a drive end and an operating end, the operating end being able to control the movement of the drive end; a slider, connected to the drive end, the drive end driving the slider to retract relative to the handle body, the slider being provided with a first connecting part; and an outer sheath connector, used to fix and connect the outer sheath, the outer sheath connector being provided with a second connecting part, so that the first connecting part and the second connecting part can be in a connected state and a separated state; when in the connected state, the slider pushes the outer sheath connector to retract during the retraction movement; when in the separated state, the slider and the outer sheath connector are configured to be able to move relative to each other along the axial direction, so that the sheath core and the outer sheath can move relative to each other and reset. This utility model achieves the technical effect of enabling the sheath core to reset inside the outer sheath after the outer sheath is retracted, avoiding the obstruction when the sheath core retracts alone.

Description

Technical Field

[0001] This utility model relates to the field of medical equipment technology, and more specifically, to a sheath moving structure, handle assembly and conveyor for a medical device delivery device. Background Technology

[0002] Interventional therapy is a new technology that has been applied in clinical practice in recent years. It involves pre-loading an implantable medical device into a delivery system, then introducing it into the human body, and releasing the medical device to the lesion site under the monitoring of a fluoroscopic device to achieve the therapeutic purpose. For example, in the treatment of cardiovascular diseases, a stent is delivered to the lesion through a delivery system, and then the stent is released to expand and support the blood vessel wall.

[0003] Before release, the stent is compressed by the radial constraint of the outer sheath, resulting in significant friction between the stent and the outer sheath. During release, the outer sheath needs to be pulled backward to overcome this friction and disengage the stent. In related technologies, a corresponding driving component is used to push the outer sheath connector, which is connected to the outer sheath, backward, thereby retracting the outer sheath. For example, in related technologies, for labor-saving purposes, a gear and rack mechanism is used to drive the outer sheath backward to release the stent at the distal end of the sheath core. However, after the outer sheath is retracted, the head end of the sheath core is completely exposed, with a considerable gap between it and the distal end of the outer sheath. If the sheath core and outer sheath are pulled out directly as a whole, the head end of the sheath core is easily obstructed during retraction. Utility Model Content

[0004] The main objective of this invention is to provide a sheath movement structure, handle assembly, and delivery device for a medical device delivery system, in order to solve the problem in related technologies where the sheath core cannot be reset after the outer sheath has been withdrawn and the stent has been released, which leads to the sheath core being easily obstructed during the withdrawal process.

[0005] To achieve the above objectives, this utility model provides a sheath moving structure for a medical device delivery device, the sheath moving structure being adapted to the handle body of an implantable medical device delivery device, comprising:

[0006] A retraction drive assembly, comprising a drive end and an operating end, wherein the operating end is capable of controlling the movement of the drive end;

[0007] A slider is provided inside the handle body. The slider is connected to the drive end and is driven by the drive end to move backward relative to the handle body. A first connecting part is provided on the slider.

[0008] An outer sheath tube connector is used to fix and connect an outer sheath tube. The outer sheath tube connector is provided with a second connecting part. At least one of the first connecting part and the second connecting part can move relative to each other so that the first connecting part and the second connecting part can be in a connected state and a separated state.

[0009] When in the connected state, the slider pushes the outer sheath tube connector to move backward during the retraction movement. When in the separated state, the slider and the outer sheath tube connector are configured to move relative to each other along the axial direction, so that the sheath core and the outer sheath tube can move relative to each other and reset.

[0010] Furthermore, the first connecting part and the second connecting part are detachably inserted into each other in the axial direction, and are in the connected state after insertion;

[0011] The outer sheath connector and the slider can rotate relative to each other so that after the first connecting part and the second connecting part are separated, they are offset from each other in the circumferential direction and are in the separated state.

[0012] Furthermore, the slider is configured as an annular shape, and an installation channel is provided inside the slider, through which at least a portion of the outer sheath connector can pass;

[0013] The first connecting part includes a snap-fit ​​groove at the distal end of the slider, and the second connecting part includes a snap-fit ​​protrusion at the proximal end of the outer sheath connector.

[0014] The distance between the sidewall of the snap-fit ​​groove and the axis of the slider is less than or equal to the inner radius of the slider, so that the snap-fit ​​protrusion can enter the slider after disengaging from the snap-fit ​​groove and pass through the mounting channel.

[0015] Furthermore, at least two snap-fit ​​slots are provided and distributed along the circumference of the slider, and the snap-fit ​​protrusions correspond to the snap-fit ​​slots.

[0016] Furthermore, a boss is provided on the inner side of the slider, and the snap-fit ​​groove is provided on the boss.

[0017] Furthermore, the outer sheath connector includes a connecting rod and a sheath joint. The snap-fit ​​protrusion is located at the distal end of the connecting rod. When the snap-fit ​​protrusion and the snap-fit ​​groove are misaligned, the connecting rod can pass through the mounting channel.

[0018] Furthermore, the retraction drive assembly includes a rotor, the drive end includes a thread disposed within the rotor, the operating end includes the outer wall of the rotor, the slider is disposed within the rotor, the slider is provided with a sliding part, the sliding part engages with the thread of the rotor, and the slider is driven to move by the rotation of the rotor;

[0019] It also includes a limiting structure for limiting the rotational movement of the outer sheath connector relative to the rotor.

[0020] Furthermore, the limiting structure includes a limiting tube for fixing inside the handle body. The limiting tube has a first limiting part arranged axially, and the outer sheath tube connector has a second limiting part. The first limiting part and the second limiting part are engaged and can move relative to each other axially, so as to restrict the rotation of the outer sheath tube connector while allowing the outer sheath tube connector to move linearly in the circumferential direction relative to the handle body.

[0021] Furthermore, the first limiting part includes a groove provided on the limiting tube, the groove extending along the axial direction of the limiting tube, and the second limiting part includes a sliding protrusion.

[0022] According to another aspect of this application, a handle assembly for a medical device delivery device is provided, including the aforementioned sheath movement structure and a handle body.

[0023] According to another aspect of this application, a medical device delivery device is provided, comprising: a sheath assembly, a handle body, and the aforementioned sheath moving structure, wherein the sheath assembly includes an outer sheath and a sheath core assembly, the sheath core assembly being movably inserted within the outer sheath, and the outer sheath being movably inserted within the handle body and fixedly connected to the outer sheath connector.

[0024] In this embodiment of the invention, after the medical device is loaded, it is constrained between the distal end of the outer sheath and the distal end of the sheath core of the delivery device. At this time, the slider and the outer sheath connector are located on the handle body near the distal end, and the first connecting part on the slider and the second connecting part on the outer sheath connector remain connected. When the medical device is delivered to the lesion location, the retraction drive assembly can be operated on the handle body. The slider is controlled to move backward on the handle body through the drive end. Under the connection of the first and second connecting parts, the slider pushes the outer sheath connector backward, thereby driving the outer sheath to retract.

[0025] The first and second connecting parts are configured to move relative to each other, and one of them can be operated to move, causing the first and second connecting parts to be in a separated state. In the separated state, the outer sheath tube connector and the slider can move relative to each other axially, that is, the outer sheath tube connector can move axially relative to the handle body. The sheath core is then connected to the handle body, specifically fixedly connected to the proximal end of the handle body. Therefore, the handle body can be operated to move the sheath core and the slider backward relative to the outer sheath tube and the outer sheath tube connector, at least partially retracting the head end of the sheath core into the outer sheath tube, thus achieving the reset of the sheath core. After reset, the handle body can be operated to withdraw the outer sheath tube and the sheath core as a whole, making the withdrawal process smoother. This solves the problem in related technologies where the sheath core cannot be reset after the outer sheath tube has been withdrawn and the support has been released, causing the sheath core to be easily obstructed during the withdrawal process. Attached Figure Description

[0026] The accompanying drawings, which form part of this utility model, are used to provide a further understanding of the utility model, making other features, objects, and advantages of the utility model more apparent. The illustrative embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute an undue limitation of the utility model. In the drawings:

[0027] Figure 1 This is a cross-sectional view of the assembled sheath moving structure according to an embodiment of the present utility model;

[0028] Figure 2 This is an exploded structural diagram of the sheath moving structure according to an embodiment of the present invention;

[0029] Figure 3 This is a schematic diagram of the structure after the limiting tube and the rotor are assembled according to an embodiment of this utility model;

[0030] Figure 4 This is a cross-sectional view of the handle assembly according to an embodiment of the present utility model;

[0031] The components include: 1. Handle body; 2. Outer sheath connector; 20. Sheath joint; 21. Connecting rod; 22. Second connecting part; 220. Snap-fit ​​protrusion; 3. Retractable drive assembly; 30. Operating end; 31. Drive end; 32. Rotor; 4. Slider; 40. Sliding part; 41. First connecting part; 410. Snap-fit ​​groove; 411. Boss; 42. Installation channel; 5. Outer sheath; 6. Restriction structure; 60. Limiting tube; 61. First limiting part; 62. Second limiting part; 7. Sheath core assembly. Detailed Implementation

[0032] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. 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 should fall within the protection scope of the present invention.

[0033] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this utility model are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this utility model described herein.

[0034] In this invention, the terms "upper," "lower," "inner," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this invention and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0035] Furthermore, in addition to indicating direction or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this utility model according to the specific circumstances.

[0036] Furthermore, the terms "set up," "equipped with," "connected," and "fixed" should be interpreted broadly. For example, "connected" can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0037] In addition, the term "multiple" should mean two or more.

[0038] It should be noted that, where there is no conflict, the embodiments and features in the embodiments of this utility model can be combined with each other. The present utility model will now be described in detail with reference to the accompanying drawings and embodiments.

[0039] like Figures 1 to 4As shown, this utility model embodiment provides a sheath moving structure for a medical device delivery device. The sheath moving structure is adapted to the handle body 1 of the implantable medical device delivery device and includes:

[0040] The retraction drive component 3 includes a drive end 31 and an operation end 30. The operation end 30 can control the movement of the drive end 31.

[0041] Slider 4 is used to be installed inside the handle body 1. Slider 4 is connected to drive end 31. Drive end 31 drives slider 4 to move backward relative to handle body 1. Slider 4 is provided with first connecting part 41.

[0042] The outer sheath tube connector 2 is used to fix the outer sheath tube 5. The outer sheath tube connector 2 is provided with a second connecting part 22. At least one of the first connecting part 41 and the second connecting part 22 can move relative to each other so that the first connecting part 41 and the second connecting part 22 can be in a connected state and a separated state.

[0043] When in the connected state, the slider 4 pushes the outer sheath tube connector 2 to move backward during the retraction process. When in the separated state, the slider 4 and the outer sheath tube connector 2 are configured to move relative to each other along the axial direction, so that the sheath core and the outer sheath tube 5 move relative to each other and reset.

[0044] Medical device delivery systems are used to deliver implantable medical devices to the lesion site within the human body and to release the implantable medical device. Taking a stent as an example of an implantable medical device, the delivery system mainly includes a handle body 1, an outer sheath 5 connected to the handle body 1, and a sheath core assembly 7. The sheath core assembly 7 includes a sheath core and a middle layer tube fixed outside the sheath core. The stent can be loaded into the loading space at the front end of the outer sheath 5 and the sheath core, at which point the stent is in a compressed state and constrained by a release element. During the intervention, a guidewire inserted into the sheath core guides the outer sheath 5 and the sheath core to move as a whole, and this movement can be performed by operating the handle. After reaching the lesion site, the outer sheath 5 is retracted by operating the handle body 1 to expose the stent constrained on the sheath core. Then, the release element is operated on the handle body 1 to release the stent, which expands and supports itself against the blood vessel wall. To facilitate movement within human tissue, the head of the sheath core is generally designed in a spindle shape, with its tip extending beyond the distal end of the outer sheath tube and its tail end housed within the outer sheath tube. The outer diameter of the outer sheath tube is the same as or close to the maximum diameter of the sheath core head, thus ensuring a smooth transition between the sheath core head and the outer sheath tube during transport.

[0045] like Figure 1 and Figure 4As shown, the sheath movement structure in this embodiment is suitable for installation on the handle body 1 of the implantable medical device delivery device, and is used to control the retraction of the outer sheath 5 when the stent is released. The sheath movement structure mainly includes a retraction drive assembly 3, a slider 4, and an outer sheath connector 2. The retraction drive assembly 3 is operated to drive the slider 4 to move backward within the handle body 1. The retraction drive assembly 3 can adopt various structural forms. For example, it can use a threaded rotor 32, with the slider 4 threadedly connected to the rotor 32, and the rotational movement of the slider 4 is restricted. The slider 4 is driven to move linearly by rotating the rotor 32. Another example is a threaded stator, with the rotor threadedly connected to the stator, and the rotor connected to the slider. The slider is driven to move by rotating the rotor. Yet another example is a gear and rack, with the rack sliding back and forth within the handle body 1. The slider is mounted on the rack, and the gear meshes with the rack. The rack is driven to slide back and forth by rotating the gear, thereby driving the slider to move linearly. Based on this, the specific structure of the retraction drive assembly 3 is not limited in this embodiment and can be designed according to actual needs.

[0046] As mentioned earlier, the slider 4 is driven by the retraction drive assembly 3 to move backward within the handle body 1. The retraction process can be either a rotational retraction or a linear retraction. Figure 1 and Figure 2 As shown, to enable the slider 4 to retract the outer sheath tube connector 2, a first connecting part 41 is provided on the slider 4, and a second connecting part 22 is provided on the corresponding outer sheath tube connector 2. The first connecting part 41 and the second connecting part 22 are detachably connected, for example, by inserting into each other axially or radially. When the first connecting part 41 and the second connecting part 22 are connected, they are in a connected state. During the retraction of the slider 4, the first connecting part 41 and the second connecting part 22 work together to push the outer sheath tube connector 2 to retract, thereby causing the outer sheath tube 5 connected to the outer sheath tube connector 2 to retract.

[0047] When the first connecting part 41 and the second connecting part 22 are separated, the outer sheath tube connector 2 and the slider can move relative to each other along the axial direction. Therefore, the axial relative movement between the first connecting part 41 and the second connecting part 22 does not interfere with each other when they are separated. At this time, the slider 4 can move backward relative to the outer sheath tube connector 2, or the outer sheath tube connector 2 can move forward relative to the slider 4.

[0048] When the outer sheath connector 2 is selected to move forward relative to the slider 4, since the outer sheath 5 has separated from the head of the sheath core, the distal end face of the outer sheath 5 is prone to scratching tissue during the forward movement of the outer sheath 5. Since the head of the sheath core is spindle-shaped and its tail end is still conical, it is preferable to retract the sheath core towards the outer sheath 5 and retract the tail end of the sheath core into the outer sheath 5 to complete the sheath core reset.

[0049] To achieve this objective, different operations are required after the first connecting part 41 and the second connecting part 22 are separated, depending on the different connection methods of the first connecting part 41 and the second connecting part 22. Taking the first connecting part 41 and the second connecting part 22 being inserted radially as an example, during separation, the outer sheath connector 2 needs to be pushed in the opposite direction so that the second connecting part 22 is completely disengaged from the first connecting part 41. At this time, the relative movement between the first connecting part 41 and the second connecting part 22 does not cause interference.

[0050] When the first connecting part 41 and the second connecting part 22 are inserted and connected in the axial direction, the outer sheath tube connector 2 needs to be pulled back to disengage the second connecting part 22 from the first connecting part 41. At this time, it is also necessary to operate the slider 4 or rotate the outer sheath tube connector 2 by a certain angle so that the first connecting part 41 and the second connecting part 22 are completely misaligned in the circumferential direction. After misalignment, the axial relative movement between the first connecting part 41 and the second connecting part 22 does not interfere.

[0051] In one embodiment, to facilitate operation and save space within the handle body 1, the first connecting part 41 and the second connecting part 22 are preferably detachably inserted in the axial direction and are in the connected state after insertion, so that the slider 4 pushes the outer sheath connecting member 2 to move backward.

[0052] The outer sheath connector 2 and the slider 4 can rotate relative to each other so that after the first connecting part 41 and the second connecting part 22 are separated, they are offset from each other in the circumferential direction and are in the separated state.

[0053] Specifically, in this embodiment, as Figure 2 As shown, the first connecting part 41 can be a snap-fit ​​groove 410 provided on the slider 4, and the second connecting part 22 can be a snap-fit ​​protrusion 220 provided on the outer sheath tube connector 2. The snap-fit ​​protrusion 220 and the snap-fit ​​groove 410 can be inserted and engaged by the axial linear movement of the slider 4 or the outer sheath tube connector 2. At this time, the slider 4 can push the outer sheath tube connector 2 to move backward. When the sheath core needs to be reset, the outer sheath tube connector 2 is pulled backward first to disengage the snap-fit ​​protrusion 220 from the snap-fit ​​groove 410. At this time, the slider 4 or the outer sheath tube connector 2 needs to be rotated so that the snap-fit ​​protrusion 220 and the snap-fit ​​groove 410 are completely misaligned in the circumferential direction. By setting the dimensions of the snap-fit ​​groove 410 and the snap-fit ​​protrusion 220, the misaligned snap-fit ​​groove 410 and the snap-fit ​​protrusion 220 do not interfere with each other in relative axial movement.

[0054] Based on this, in a specific implementation, such as Figure 2 As shown, the slider 4 is set as a ring, and an installation channel 42 is provided inside the slider 4. The connecting rod 21 and the second connecting part 22 on the outer sheath tube connector 2 can pass through the installation channel 42.

[0055] The first connecting part 41 includes a snap-fit ​​groove 410 located at the distal end of the slider 4, and the second connecting part 22 includes a snap-fit ​​protrusion 220 located at the proximal end of the outer sheath connector 2.

[0056] The distance between the side wall of the snap-fit ​​groove 410 and the axis of the slider 4 is less than or equal to the inner radius of the slider 4, so that the snap-fit ​​protrusion 220 can enter the slider 4 after disengaging from the snap-fit ​​groove 410 and pass through the mounting channel 42.

[0057] In this embodiment, the outer wall of the slider 4 can be connected to the drive end 31 of the retraction drive assembly 3, for example, to the internal thread of the rotor 32. The mounting channel 42 inside the slider 4 allows at least a portion of the outer sheath connector 2 to pass through, thereby satisfying the rapid retraction of the outer sheath connector 2. In addition, the first connecting part 41 can be a snap-fit ​​groove 410 provided at the far end of the slider 4, that is, a snap-fit ​​groove 410 extending axially for a certain length is provided on the rear end face of the slider 4, and the second connecting part 22 can be a snap-fit ​​protrusion 220 provided at the near end of the outer sheath connector 2, that is, a snap-fit ​​protrusion 220 extending axially for a certain length is provided at the front end of the outer sheath connector 2. The end of the snap-fit ​​groove 410 away from the snap-fit ​​protrusion 220 can be a closed wall, through which thrust is transmitted to the snap-fit ​​protrusion 220. It can also be a groove, but the width of the groove should be smaller than the width of the snap-fit ​​protrusion 220, so as to be able to transmit thrust.

[0058] Based on this, in order for the snap-fit ​​protrusion 220 to enter the mounting channel 42 of the slider 4 axially after disengaging from and completely offset from the snap-fit ​​groove 410, in this embodiment, the distance between the side wall of the snap-fit ​​groove 410 and the axis of the slider 4 is less than or equal to the inner radius of the slider 4. In other words, in this embodiment, the distance between the outermost end face of the snap-fit ​​protrusion 220 and the axis of the outer sheath connector 2 needs to be less than or equal to the radius of the mounting channel 42 in the slider 4, so that it can enter the mounting channel 42.

[0059] To provide stable thrust, in this embodiment, at least two locking slots 410 are provided and distributed along the circumference of the slider 4, and the locking protrusions 220 correspond to the locking slots 410.

[0060] Because the distance between the sidewall of the snap-fit ​​groove 410 and the axis of the slider 4 is less than or equal to the inner radius of the slider 4, a groove cannot be directly cut into the inner wall of the slider 4. Figure 2 As shown, in this embodiment, a boss 411 is provided on the inner side of the slider 4, and a snap-fit ​​groove 410 is provided on the boss 411.

[0061] In one embodiment of the outer sheath connector 2, such as 1 and Figure 2As shown, the outer sheath connector 2 includes a connecting rod 21 and a sheath connector 20. A snap-fit ​​protrusion 220 is located at the far end of the connecting rod 21. When the snap-fit ​​protrusion 220 and the snap-fit ​​groove 410 are misaligned, the connecting rod 21 can pass through the installation channel 42.

[0062] Specifically, in this embodiment, the sheath connector 20 and the connecting rod 21 are concentrically arranged and fixedly connected. The connecting rod 21 is a hollow rod-shaped structure, and the sheath connector 20 has a channel corresponding to the connecting rod 21. The outer sheath 5 can be inserted and fixed inside the connecting rod 21, and the sheath core assembly 7, which passes through the outer sheath 5, can extend backward through the sheath structure. The end of the connecting rod 21 away from the sheath connector 20 (i.e., the second end) is connected to the slider 4.

[0063] In one embodiment of the retraction drive component 3, such as Figure 1 and Figure 2 As shown, the retraction drive assembly 3 includes a rotor 32, a drive end 31 including a thread provided in the rotor 32, an operating end 30 including the outer wall of the rotor 32, a slider 4 provided in the rotor 32, a sliding part 40 provided on the slider 4, the sliding part 40 engaging with the thread of the rotor 32, and the slider 4 being driven to move by the rotation of the rotor 32.

[0064] In this embodiment, the rotor 32 is mounted on the handle body 1 and can rotate around its own axis. The rotor 32 is a hollow cylindrical structure with threads on its inner wall. The slider 4 is disposed on the inner wall of the rotor 32. The sliding part 40 on the slider 4 can be either a thread or a cylindrical protrusion. The sliding part 40 engages with the threads inside the rotor 32. When the sliding part 40 is threaded, the two are in a meshing relationship. To enable the rotation of the rotor 32 to drive the slider 4 to move linearly, it is necessary to restrict the rotational movement of the slider 4. As mentioned above, the slider 4 and the connecting rod 21 of the outer sheath connector 2 are engaged through a snap-fit ​​groove 410 and a snap-fit ​​protrusion 220. Therefore, restricting the rotational movement of the slider 4 is equivalent to restricting the rotational movement of the outer sheath connector 2. Based on this, as Figure 1 and Figure 3 As shown, this embodiment also includes a limiting structure 6 for limiting the rotational movement of the outer sheath connector 2 relative to the rotor 32. The limiting structure 6 can be a slide rail, protrusion, etc., provided on the handle body 1. Correspondingly, protrusions, sliders 4, etc., need to be configured on the outer sheath connector 2.

[0065] Since the rotation of the outer sheath connector 2 is restricted in this embodiment, the sheath core can only be reset by rotating the slider 4 to misalign the locking groove 410 and the locking protrusion 220. The rotation of the slider 4 can be achieved by operating the rotor 32. Since the locking groove 410 and the locking protrusion 220 are separated at this time, the rotation of the slider 4 is no longer restricted, and therefore the slider 4 can rotate with the rotor 32.

[0066] In one implementation, such as Figures 1 to 3 As shown, the limiting structure 6 includes a limiting tube 60, which is used to fix it inside the handle body 1. A first limiting part 61 is provided on the limiting tube 60 along the axial direction, and a second limiting part 62 is provided on the outer sheath tube connector 2. The first limiting part 61 and the second limiting part 62 are engaged and can move relative to each other along the axial direction, so as to restrict the rotation of the outer sheath tube connector 2 while the outer sheath tube connector 2 can move linearly in the circumferential direction relative to the handle body 1.

[0067] Specifically, in this embodiment, the limiting tube 60 can be clamped and fixed inside the handle body 1, and the retraction direction of the outer sheath tube connector 2 coincides with the axial direction of the limiting tube 60. During the retraction process, the outer sheath tube connector 2 can move linearly backward relative to the limiting tube 60, and a part of the outer sheath tube connector 2 can be sleeved on the outside of the limiting tube 60. For example, the sheath tube joint 20 of the outer sheath tube connector 2 can be sleeved on the outside of the limiting tube 60. A first limiting part 61 is provided axially on the limiting tube 60, and a second limiting part 62 is provided axially on the outer sheath tube connector 2. When the limiting tube 60 and the outer sheath tube connector 2 satisfy the sleeve relationship, the first limiting part 61 and the second limiting part 62 satisfy the radial snap-fit ​​relationship. The rotation of the outer sheath tube connector 2 relative to the limiting tube 60 is restricted by the cooperation of the first limiting part 61 and the second limiting part 62, that is, its rotation relative to the rotor 32 and the handle body 1 is restricted.

[0068] In addition, the limiting tube 60 also serves as a guide structure for the retraction of the outer sheath tube connector 2, which can guide the retraction of the outer sheath tube connector 2 and prevent it from getting stuck.

[0069] Furthermore, the first limiting part 61 includes a groove provided on the limiting tube 60, the groove extending along the axial direction of the limiting tube 60, and the second limiting part 62 includes a sliding protrusion.

[0070] Specifically, the groove is an elongated groove, the length of which needs to meet the retraction stroke of the outer sheath tube connector 2. The groove can be set on both sides of the limiting tube 60. The sliding protrusion is set on the outer wall of the outer sheath tube connector 2 and extends radially, preferably set on the connecting rod 21 of the outer sheath tube connector 2. The sliding protrusion and the groove can be engaged and can move relative to each other in the axial direction.

[0071] In the embodiment where the retraction drive assembly 3 includes the rotor 32, the distal end of the limiting tube 60 can be connected to the rotor 32 after passing through the sheath joint 20. The sheath joint 20 and the connecting rod 21 can be connected by a rib plate, which can be set in the groove of the limiting tube 60. The connecting rod 21 can pass through the channel in the limiting tube 60. During the retraction process, both the sheath joint 20 and the limiting tube 60 can move along the limiting tube 60.

[0072] According to another aspect of this application, a handle assembly for a medical device delivery device is provided, including the aforementioned sheath movement structure and a handle body 1.

[0073] According to another aspect of this application, a medical device delivery device is provided, comprising: a sheath assembly, a handle body 1, and the aforementioned sheath moving structure. The sheath assembly includes an outer sheath 5 and a sheath core assembly 7, the sheath core assembly 7 being movably inserted into the outer sheath 5, and the outer sheath 5 being movably inserted into the handle body 1 and fixedly connected to the outer sheath connector 2.

[0074] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A sheath moving structure for a medical device delivery device, the sheath moving structure being adapted to the handle body of an implantable medical device delivery device, characterized in that, include: A retraction drive assembly, comprising a drive end and an operating end, wherein the operating end is capable of controlling the movement of the drive end; A slider is used to be installed inside the handle body. The slider is connected to the drive end and is driven by the drive end to move backward relative to the handle body. A first connecting part is provided on the slider. An outer sheath tube connector is used to fix and connect an outer sheath tube. The outer sheath tube connector is provided with a second connecting part. At least one of the first connecting part and the second connecting part can move relative to each other so that the first connecting part and the second connecting part can be in a connected state and a separated state. When in the connected state, the slider pushes the outer sheath tube connector to move backward during the retraction movement. When in the separated state, the slider and the outer sheath tube connector are configured to move relative to each other along the axial direction, so that the sheath core and the outer sheath tube can move relative to each other and reset.

2. The sheath moving structure according to claim 1, characterized in that, The first connecting part and the second connecting part are detachably inserted into each other in the axial direction, and are in the connected state after insertion; The outer sheath connector and the slider can rotate relative to each other so that after the first connecting part and the second connecting part are separated, they are offset from each other in the circumferential direction and are in the separated state.

3. The sheath moving structure according to claim 2, characterized in that, The slider is ring-shaped, and an installation channel is provided inside the slider, through which at least a portion of the outer sheath connector can pass. The first connecting part includes a snap-fit ​​groove at the distal end of the slider, and the second connecting part includes a snap-fit ​​protrusion at the proximal end of the outer sheath connector. The distance between the sidewall of the snap-fit ​​groove and the axis of the slider is less than or equal to the inner radius of the slider, so that the snap-fit ​​protrusion can enter the slider after disengaging from the snap-fit ​​groove and pass through the mounting channel.

4. The sheath moving structure according to claim 3, characterized in that, The snap-fit ​​grooves are provided in at least two and distributed along the circumference of the slider, and the snap-fit ​​protrusions correspond to the snap-fit ​​grooves.

5. The sheath moving structure according to claim 4, characterized in that, The slider has a boss on its inner side, and the snap-fit ​​groove is provided on the boss.

6. The sheath moving structure according to claim 3, characterized in that, The outer sheath connector includes a connecting rod and a sheath joint. The snap-fit ​​protrusion is located at the distal end of the connecting rod. When the snap-fit ​​protrusion and the snap-fit ​​groove are misaligned, the connecting rod can pass through the mounting channel.

7. The sheath moving structure according to claim 1, characterized in that, The retraction drive assembly includes a rotor, the drive end includes a thread provided in the rotor, the operating end includes the outer wall of the rotor, the slider is provided in the rotor, the slider is provided with a sliding part, the sliding part engages with the thread of the rotor, and the slider is driven to move by the rotation of the rotor. It also includes a limiting structure for limiting the rotational movement of the outer sheath connector relative to the rotor.

8. The sheath moving structure according to claim 7, characterized in that, The limiting structure includes a limiting tube and a second limiting part. The limiting tube is used to fix it inside the handle body. A first limiting part is provided on the limiting tube along the axial direction. The outer sheath tube connector is provided with a second limiting part. The first limiting part and the second limiting part are engaged and can move relative to each other along the axial direction to limit the rotation of the outer sheath tube connector while the outer sheath tube connector can move linearly in the circumferential direction relative to the handle body.

9. The sheath moving structure according to claim 8, characterized in that, The first limiting part includes a groove provided on the limiting tube, the groove extending along the axial direction of the limiting tube, and the second limiting part includes a sliding protrusion.

10. A handle assembly for a medical device delivery device, characterized in that, It includes the sheath moving structure as described in any one of claims 1 to 9, and the handle body.

11. A medical device delivery device, characterized in that, include: The sheath assembly, the handle body, and the sheath moving structure as described in any one of claims 1 to 9, wherein the sheath assembly includes an outer sheath and a sheath core assembly, the sheath core assembly being movably inserted into the outer sheath, and the outer sheath being movably inserted into the handle body and fixedly connected to the outer sheath connector.

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