Sheath tube retraction structure, handle assembly, and delivery device
The threaded meshing structure between the rotor and the slider solves the problem of release difficulties caused by friction between the outer sheath and the stent, enabling effortless retraction and precise control of the outer sheath, thus improving the safety and efficiency of interventional therapy.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- MEDIHEALTH WELLTONE TECH (GUANGDONG) CO LTD
- Filing Date
- 2025-07-09
- Publication Date
- 2026-06-09
AI Technical Summary
In interventional therapy, the friction between the outer sheath and the stent makes the release operation difficult and the retraction distance hard to control precisely.
The rotor and slider are connected by a threaded meshing structure. The rotor drives the slider to move linearly, and the slider's rotation is restricted by a limiting structure, thereby enabling the outer sheath to retract.
It reduces the difficulty of retracting the outer sheath, improves the accuracy and safety of retraction, reduces distraction, and ensures the controllability of the release process.
Smart Images
Figure CN224331090U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of medical device technology, and more specifically, to an external sheath retraction structure, a handle assembly, and a 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 detach the stent from it. However, directly pulling the outer sheath backward makes the release operation difficult due to frictional resistance, and the direct pulling method makes it difficult to precisely control the retraction distance. Utility Model Content
[0004] The main objective of this invention is to provide an external sheath retraction structure, a handle assembly, and a delivery device to solve the problem in related technologies where the release of medical devices within the delivery device is difficult due to high release resistance, and the retraction distance is hard to control precisely.
[0005] To achieve the above objectives, this utility model provides an external sheath retraction structure, which is adapted to be installed in the handle of an implantable medical device delivery device, comprising:
[0006] A rotor, wherein the rotor is provided with threads;
[0007] A slider, wherein a sliding part is provided on the slider, the sliding part engaging with the thread of the rotor, and the slider is driven to move by the rotation of the rotor;
[0008] A limiting structure is provided to restrict the rotational movement of the slider relative to the rotor;
[0009] An outer sheath tube connector, the first end of which is used to fix and connect the outer sheath tube, and the second end of which is connected to the slider, and the outer sheath tube connector is pushed back by the slider.
[0010] Furthermore, the inner wall of the rotor is provided with threads, and the slider is located inside the rotor.
[0011] Furthermore, the limiting structure includes a first limiting part and a second limiting part;
[0012] A first limiting part is disposed between the slider and the second end of the outer sheath connector, for limiting the rotation of the slider relative to the outer sheath connector;
[0013] The second limiting part is used to limit the rotational movement of the outer sheath connector relative to the rotor.
[0014] Furthermore, the second end of the outer sheath connector is axially aligned with the slider, so that the slider can push the outer sheath connector backward, and the outer sheath connector can also be retracted independently and separated from the slider.
[0015] Furthermore, the sliding part includes threads provided on the slider, and the slider is threadedly connected to the rotor.
[0016] Furthermore, the sliding part includes a protrusion provided on the slider, the protrusion engaging with the thread of the rotor.
[0017] Furthermore, the threads on the rotor include at least a first thread segment and a second thread segment, the first thread segment and the second thread segment being distributed along the retraction direction of the slider, and the pitch of the first thread segment being less than the pitch of the second thread segment.
[0018] Furthermore, the first limiting part includes a first locking part and a second locking part. The first locking part is disposed on the slider, and the second locking part is disposed at the second end of the outer sheath connector. The first locking part and the second locking part engage to limit the rotational movement of the slider relative to the rotor.
[0019] Furthermore, the first snap-fit portion is a first snap-fit groove located near the end of the slider, and the second snap-fit portion is a second snap-fit protrusion, which is inserted into the first snap-fit groove along the axial direction of the rotor.
[0020] Furthermore, the outer sheath connector includes a sheath joint and a connecting rod. The connecting rod is fixedly connected to the sheath joint. The first end of the connecting rod is used to fixally connect the outer sheath, and the second end of the connecting rod is used to connect to the slider. The first limiting part is provided between the second end of the connecting rod and the slider.
[0021] Furthermore, the second limiting part includes a limiting tube for fixing inside the handle body. The limiting tube has a third locking part arranged axially, and the outer sheath tube connector has a fourth locking part. The fourth locking part engages with the third locking part and can move relative to it axially, so as to restrict the rotation of the outer sheath tube connector while allowing the outer sheath tube connector to move axially relative to the handle.
[0022] Furthermore, the third snap-fit portion is a third snap-fit groove provided on the limiting tube, the third snap-fit groove extending along the axial direction of the limiting tube, and the fourth snap-fit portion is a fourth snap-fit protrusion.
[0023] Furthermore, the distance between the sidewall of the first snap-fit groove and the axis of the slider is less than or equal to the inner radius of the slider.
[0024] Furthermore, a boss is provided on the inner side of the slider, and the first snap-fit groove is provided on the boss.
[0025] Furthermore, the rotor includes a first rotating body and a second rotating body disposed opposite to each other, the first rotating body and the second rotating body being detachably fixedly connected, and the first rotating body and the second rotating body being provided with matching threads.
[0026] Furthermore, the first rotating body and the second rotating body are provided with first limiting end faces at both ends, which restrict the slider from disengaging.
[0027] Furthermore, the rotor is a one-piece structure.
[0028] Furthermore, a loading inlet is provided at one end of the rotor, and a second limiting end face is provided at the other end of the rotor. The slider is loaded into the rotor through the loading inlet. An end cover is detachably provided on the loading inlet. The end cover and the second limiting end face are used to restrict the slider from detaching.
[0029] According to another aspect of this application, a handle assembly for a medical device delivery device is provided, including the aforementioned sheath retraction structure and a handle body.
[0030] The rotor is installed inside the handle body and is rotatable. The slider is located inside the rotor. The outer sheath connector is located inside the handle body and is connected to the slider.
[0031] 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 retraction structure;
[0032] The sheath assembly includes an outer sheath and a sheath core assembly. The rotor is installed inside the handle body and is rotatable. The slider is located inside the rotor. The outer sheath connector is located inside the handle body and connected to the slider.
[0033] The sheath core assembly is movably inserted into the outer sheath tube, and the outer sheath tube is movably inserted into the handle body and fixedly connected to the first end of the outer sheath tube connector.
[0034] In this embodiment of the invention, a rotor with threads is provided; a slider with a sliding part that engages with the threads of the rotor, driving the slider to move through the rotation of the rotor; a limiting structure for limiting the rotational movement of the slider relative to the rotor; and an outer sheath connector, the first end of which is fixedly connected to the outer sheath, and the second end of which is connected to the slider, allowing the slider to push the outer sheath connector backward. During backward movement, the rotor rotates in a directional direction. The limiting structure restricts the rotational movement of the slider during rotor rotation, causing the slider, which engages with the threads on the rotor, to move linearly along the rotor's axial direction. Since the slider is connected to the outer sheath connector, and the outer sheath connector is connected to the outer sheath, the backward linear movement of the slider can push both the outer sheath connector and the outer sheath backward.
[0035] On the one hand, because the rotor is rotated during the retraction of the outer sheath tube, the screw of the rotor drives the slider to move linearly, and the slider pushes the outer sheath tube connector linearly, it is more labor-saving than directly pulling the outer sheath tube connector in the same environment of frictional resistance, making it easier for the operator to perform the retraction of the outer sheath tube and reducing the difficulty of operation.
[0036] On the other hand, due to the use of a threaded drive, the retraction distance can be controlled more easily, improving the accuracy of retraction. The retraction rhythm is controllable and orderly, allowing for simultaneous release and adjustment of the position of the medical device within the body. This reduces the need for deliberate force during release, which can distract attention from the need for observation and improves safety. Attached Figure Description
[0037] 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:
[0038] Figure 1 This is a schematic diagram of the sheath retraction structure according to an embodiment of the present utility model;
[0039] Figure 2 yes Figure 1 Exploded view of the split-structure of the central rotor;
[0040] Figure 3 yes Figure 1 Exploded structural diagram of the central rotor as a single unit;
[0041] Figure 4 This is a schematic diagram of the sheath retraction structure according to another embodiment of the present invention;
[0042] Figure 5 yes Figure 4 Schematic diagram of the structure of the inner and outer sheath connector;
[0043] Figure 6 According to the embodiments of this utility model Figure 1 A schematic diagram of the exploded structure of a conveyor with a sheath retraction mechanism;
[0044] Figure 7 yes Figure 6 A schematic diagram of the shaft side structure of the conveyor after assembly;
[0045] Figure 8 yes Figure 6 A cross-sectional view of the assembled conveyor.
[0046] Figure 9 According to the embodiments of this utility model Figure 4 A cross-sectional schematic diagram of the conveyor with a sheath retraction structure;
[0047] The components include: 1. Handle body; 100. First housing; 101. Second housing; 200. Outer sheath; 3. Sheath core assembly; 12. Rotor; 121. First rotating body; 122. Second rotating body; 123. End cap; 13. Slider; 130. Sliding part; 14. Outer sheath connector; 140. Connecting rod; 141. Sheath joint; 15. Limiting tube; 150. Third locking part; 1500. Third locking groove; 16. First limiting part; 160. First locking part; 1600. First locking groove; 1601. Boss; 161. Second locking part; 1610. Second locking protrusion; 17. Fourth locking part; 170. Fourth locking protrusion; 18. Pressure plate. Detailed Implementation
[0048] 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.
[0049] 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.
[0050] 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.
[0051] 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.
[0052] 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.
[0053] In addition, the term "multiple" should mean two or more.
[0054] 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 technical solutions of the various embodiments of this utility model can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope claimed by this utility model. The present utility model will now be described in detail with reference to the accompanying drawings and embodiments.
[0055] It should be noted that the terms "distal" and "proximal" are used as directional terms, which are commonly used in the medical device field. "Distal" refers to the end furthest from the operator during surgery, while "proximal" refers to the end closest to the operator. Axial direction refers to the direction parallel to the line connecting the center of the distal and proximal ends of the medical device in its naturally unfolded state; radial direction refers to the direction perpendicular to the aforementioned axial direction.
[0056] To solve related technical problems, such as Figures 1 to 3 As shown, this utility model embodiment provides an external sheath retraction structure, which is adapted to the handle body 1 of an implantable medical device delivery device, and includes:
[0057] Rotor 12, with threads provided on rotor 12;
[0058] The slider 13 has a sliding part 130, which engages with the rotor 12 through a thread. The slider 13 is driven to move by the rotation of the rotor 12.
[0059] A limiting structure is used to limit the rotational movement of slider 13 relative to rotor 12;
[0060] The outer sheath tube connector 14 has a first end for fixedly connecting the outer sheath tube 200, and a second end for connecting the outer sheath tube connector 14 to the slider 13. The slider 13 pushes the outer sheath tube connector 14 to retract.
[0061] 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 200 connected to the handle body 1, and a sheath core assembly 3. The stent can be loaded into the loading space at the distal end of the outer sheath 200 and the sheath core assembly 3, at which point the stent is in a compressed state and constrained by a release mechanism. During the implantation process, a guidewire inserted into the sheath core assembly 3 guides the outer sheath 200 and the sheath core assembly 3 to move as a whole, and this movement can be performed by operating the handle. After reaching the lesion site, the outer sheath 200 is retracted by operating the handle body 1 to expose the stent constrained on the sheath core assembly 3, and then the release mechanism is operated on the handle to release the stent.
[0062] In this embodiment, the sheath retraction structure is adapted to be installed on the handle body 1 of the implantable medical device delivery device, and is used to control the retraction of the outer sheath 200 when the stent is released. Figure 1 and Figure 2 As shown, the sheath retraction structure mainly includes a rotor 12, a slider 13, a limiting structure, and an outer sheath connector 14. The outer sheath connector 14 can be installed inside the handle body 1 of the conveyor. The first end (i.e., the distal end) of the outer sheath connector 14 can be fixedly connected to the first end (i.e., the proximal end) of the outer sheath 200, thereby driving the outer sheath 200 to move. The rotor 12 can be installed inside the handle body 1 and can be operated to rotate in a specific direction, such as clockwise or counterclockwise. A thread is provided on the rotor 12, which can be located on the outer wall or the inner wall of the rotor 12. When the thread is located on the inner wall of the rotor 12, the rotor 12 should be a hollow structure. A sliding part 130 is provided on the slider 13, which can engage with the thread on the rotor 12. The sliding part 130 can be a thread on the slider 13, allowing the slider 13 to be threadedly connected to the rotor 12. The sliding part 130 can be a columnar protrusion or a short thread provided on the slider 13. After the columnar protrusion engages in the thread of the rotor 12, the columnar protrusion or the short thread can move linearly along a specific trajectory during the rotation of the rotor 12.
[0063] In this embodiment, it is desired that the slider 13 moves linearly due to the rotation of the rotor 12. Therefore, after the sliding part 130 on the slider 13 engages with the thread on the rotor 12, it is necessary to further restrict the rotational movement of the slider 13 so that during the rotation of the rotor 12, the slider 13 can only move linearly along the axial direction and cannot rotate with the rotor 12. For this purpose, a limiting structure is provided in this embodiment to restrict the rotational movement of the slider 13 relative to the rotor 12.
[0064] Depending on the function of the limiting structure, when the slider 13 is installed on the outer wall of the rotor 12, the limiting structure can be a groove, slide rail, guide rod on the handle body 1, a sliding protrusion, sliding hole, etc. on the slider 13. When the sliding hole is installed on the inner wall of the rotor 12, the slider 13 is not easy to cooperate with the structure on the handle body 1. In this case, the limiting structure can be arranged between the outer sheath tube connector 14 and the slider 13. This will not be described in detail in this embodiment.
[0065] Under the rotation of rotor 12, slider 13 can move linearly along the axial direction, and then pushes outer sheath connector 14 to move linearly, thereby causing outer sheath 200 to retract. Various connection relationships can be adopted between slider 13 and outer sheath connector 14. For example, slider 13 and the second end (i.e., the distal end) of outer sheath connector 14 can abut against each other, or slider 13 and the second end of outer sheath connector 14 can be axially inserted, or slider 13 and the second end of outer sheath connector 14 can be fixed, etc. In this embodiment, the connection relationship between the two is not limited, as long as it satisfies the requirement that the thrust of slider 13 is applied to outer sheath connector 14.
[0066] In this embodiment, during retraction, the rotor 12 is rotated in a directional manner. During the rotation of the rotor 12, the rotational movement of the slider 13 is restricted by a limiting structure, causing the slider 13, which meshes with the threads on the rotor 12, to move linearly along the axial direction of the rotor 12. Since the slider 13 is connected to the outer sheath connector 14, and the outer sheath connector 14 is connected to the outer sheath 200, the backward linear movement of the slider 13 can push the outer sheath connector 14 and the outer sheath 200 backward. Because the rotor 12 rotates during the retraction of the outer sheath 200, the threads of the rotor 12 drive the slider 13 to move linearly, and the slider 13 pushes the outer sheath connector 14 linearly. Under the same frictional resistance, this method is more labor-saving than directly pulling the outer sheath connector 14, making it easier for the operator to retract the outer sheath 200 and reducing the operational difficulty. This solves the problem in related technologies where the release of medical devices within the delivery device is difficult due to high release resistance.
[0067] Furthermore, due to the use of a threaded drive, the retraction distance can be controlled more easily, improving the accuracy of retraction. The retraction rhythm is controllable and orderly, allowing for simultaneous release and adjustment of the medical device's position within the body. This reduces the need for deliberate force during release, which can distract from the need for simultaneous observation and improves safety.
[0068] In one embodiment, when the outer wall of the rotor 12 is threaded and the slider 13 is located on the outside of the rotor 12, although the outer sheath 200 can be retracted in a relatively effortless manner, the inner diameter of the slider 13 will be larger than the outer diameter of the rotor 12, resulting in a less efficient effort-saving effect. Therefore, as... Figure 1 As shown, in this embodiment, the slider 13 is disposed inside the rotor 12. Specifically, a thread is provided on the inner wall of the rotor 12, and the slider 13 is disposed inside the rotor 12. With this arrangement, the outer diameter of the rotor 12 is larger than the outer diameter of the slider 13, which can further reduce the effort when the rotor 12 rotates through the lever effect.
[0069] It is understandable that the smaller the thread pitch on the inner wall of rotor 12, the less effort is required, and correspondingly, the more rotations of rotor 12 are needed to achieve the same drive stroke. Conversely, the larger the thread pitch on the inner wall of rotor 12, the more effort is required, and correspondingly, the fewer rotations of rotor 12 are needed to achieve the same drive stroke. The thread pitch can be set according to the actual situation.
[0070] When the slider 13 is disposed inside the rotor 12, the limiting structure includes a first limiting part and a second limiting part; the first limiting part is disposed between the slider and the second end of the outer sheath tube connector, and is used to limit the rotation of the slider relative to the outer sheath tube connector; the second limiting part is used to limit the rotational movement of the outer sheath tube connector relative to the rotor.
[0071] In this embodiment, the first limiting part 16 is located between the second end of the outer sheath tube connector 14 and the slider 13. At this time, the slider 13 and the second end of the outer sheath tube connector 14 are no longer simply abutting each other; they need to have a radial insertion-fitting relationship. Firstly, the first limiting part 16 prevents the slider 13 from rotating relative to the outer sheath tube connector 14. Secondly, it is necessary to prevent the outer sheath tube connector 14 from rotating relative to the rotor 12, thereby limiting the slider 13's rotation relative to the rotor 12. Therefore, this embodiment also includes a second limiting part, which restricts the rotational movement of the outer sheath tube connector 14 relative to the rotor 12. The second limiting part can be provided on the outer sheath tube connector 14 and the handle body, and they cooperate to restrict the rotation of the outer sheath tube connector 14. For example, the second limiting part can be a groove, protrusion, etc., on the outer sheath tube connector 14, and a corresponding groove and protrusion can be provided on the handle body.
[0072] Controlling the outer sheath 200 to retract by rotating the rotor 12 is less strenuous than directly pulling the outer sheath 200 backward, but requires more work. In some cases, it is necessary to directly pull the outer sheath 200 backward to save operation time. Therefore, the retraction structure in this embodiment needs to accommodate both the rotor 12 rotation retraction method and the outer sheath 200 direct retraction method.
[0073] Specifically, in this embodiment, the second end of the outer sheath connector 14 is not fixedly connected to the slider 13, but is axially aligned, so that the slider 13 can push the outer sheath connector 14 backward, and the outer sheath connector 14 can be retracted independently and separated from the slider 13. Based on this, to limit the relative rotation of the slider 13 and the outer sheath connector 14 by the first limiting part 16, the first limiting part 16 can be a groove extending radially on the slider 13 and a protrusion extending radially on the second end of the outer sheath connector 14. Of course, the groove and the protrusion can be interchanged, and this embodiment does not impose any restrictions. The groove and the protrusion are engaged through axial linear movement, which can both limit the relative rotation of the slider 13 and the outer sheath connector 14 and separate them through axial movement, allowing the outer sheath connector 14 to be directly pulled backward.
[0074] In one embodiment, the sliding part 130 includes threads on the slider 13, which is threadedly connected to the rotor 12. With this configuration, the pitch distribution of each thread segment on the rotor 12 is consistent, and the rotational motion of the rotor 12 can stably drive the slider 13 to move linearly.
[0075] In another embodiment, the sliding part 130 includes a protrusion provided on the slider 13, which engages with the thread of the rotor 12.
[0076] Specifically, in this embodiment, the sliding part 130 is no longer a thread provided on the outer wall of the slider 13, but one or more protrusions. When there are multiple protrusions, the multiple protrusions are distributed at intervals, and the distribution pattern is still in the form of a spiral.
[0077] The retraction of the outer sheath 200 can be divided into two stages: the first stage is from the support being completely wrapped to partial release, and the second stage is from partial release to complete release. The first stage has the greatest resistance, so the focus is on saving effort; the second stage has less resistance, so the focus is on saving time. When the slider 13 is threadedly connected to the rotor 12, the number of rotations of the rotor 12 and the linear travel of the slider 13 are linearly related throughout the retraction phase, which cannot match the different stages' requirements for saving effort and time.
[0078] Therefore, in this embodiment, the thread distribution on the rotor 12 is adjusted. Specifically, the thread on the rotor 12 includes at least a first thread segment and a second thread segment. The first thread segment and the second thread segment are distributed along the retraction direction of the slider 13, and the pitch of the first thread segment is smaller than the pitch of the second thread segment.
[0079] With this configuration, the first threaded section has a smaller pitch, and the second threaded section has a larger pitch. When controlling the linear movement of the slider 13 via the first threaded section, less effort is required. When controlling the linear movement of the slider 13 via the second threaded section, the slider 13 travels a greater distance with the same number of rotations, thus saving more time. Because the threads on the rotor 12 are configured this way, the slider 13 cannot be threadedly connected to the rotor 12. Therefore, the sliding portion 130 on the slider 13 is a protrusion, preferably cylindrical, to reduce sliding friction resistance within the threads.
[0080] In one embodiment of the first limiting part 16, such as Figure 2 , Figure 4 and Figure 5 As shown, the first limiting part 16 includes a first locking part 160 and a second locking part 161. The first locking part 160 is disposed on the slider 13, and the second locking part 161 is disposed on the second end of the outer sheath connector 14. The first locking part 160 and the second locking part 161 engage to limit the rotational movement of the slider 13 relative to the rotor 12.
[0081] Specifically, the first locking part 160 and the second locking part 161 can be snapped together (not shown in the figure), that is, both the first locking part 160 and the second locking part 161 are set as snaps, and the slider 13 and the outer sheath tube connector 14 can be axially connected, while the first locking part 160 and the second locking part 161 are snapped together. Although this structure can push the outer sheath tube connector 14 backward by the slider 13, it cannot meet the requirement that the outer sheath tube connector 14 actively disengage from the slider 13 for rapid backward retraction. Therefore, as Figure 2 As shown, the preferred first engaging portion 160 is a first engaging groove 1600 located near the end of the slider 13, and the second engaging portion 161 is a second engaging protrusion 1610. The second engaging protrusion 1610 and the first engaging groove 1600 are inserted into each other along the axial direction of the rotor 12, and the far end of the first engaging groove 1600 is closed, so that thrust can be transmitted to the second engaging protrusion 1610.
[0082] Of course, the far end of the first snap-fit slot 1600 may not be closed, but its opening width should be smaller than the width of the second snap-fit protrusion 1610 so as to be able to transmit thrust.
[0083] In this embodiment, the first snap-fit groove 1600 extends radially along the slider 13, and the second snap-fit protrusion 1610 also extends radially along the outer sheath connector 14. The two can be engaged and disengaged through axial linear movement. The first snap-fit groove 1600 can be configured as multiple and distributed circumferentially along the slider 13, and the corresponding second snap-fit protrusion 1610 can also be configured as multiple and distributed circumferentially along the outer sheath connector 14.
[0084] In one embodiment of the outer sheath connector 14, such as Figure 2 As shown, the outer sheath connector 14 includes a sheath joint 141 and a connecting rod 140. The connecting rod 140 is fixedly connected to the sheath joint 141. The connecting rod 140 is used to fixally connect the outer sheath 200. The distal end of the connecting rod 140 is used to connect to the slider 13. A first limiting part 16 is provided between the distal end of the connecting rod 140 and the slider 13.
[0085] Specifically, in this embodiment, the sheath connector 141 and the connecting rod 140 are concentrically arranged and fixedly connected. The connecting rod 140 is a hollow rod-shaped structure, and the sheath connector 141 has a channel corresponding to the connecting rod 140. The outer sheath 200 can be inserted and fixed inside the connecting rod 140, and the sheath core assembly 3, which passes through the outer sheath 200, can extend through the sheath structure and towards the proximal end. The distal end of the connecting rod 140 is connected to the slider 13, and the first limiting part 16 is disposed here.
[0086] As described above, the second limiting part is used to cooperate with the handle to limit the rotation of the outer sheath connector 14 relative to the rotor 12. In one embodiment, such as Figure 1 and Figure 4 As shown, the second limiting part includes a limiting tube 15, which is used to fix it inside the handle body 1. A third locking part 150 is provided on the limiting tube 15 along the axial direction. The outer sheath tube connector 14 is provided with a fourth locking part 17. The fourth locking part 17 and the third locking part 150 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 14 while the outer sheath tube connector 14 can move axially relative to the handle.
[0087] Specifically, in this embodiment, the limiting tube 15 can be clamped and fixed inside the handle, and the retraction direction of the outer sheath tube connector 14 coincides with the axial direction of the limiting tube 15. During the retraction process, the outer sheath tube connector 14 can move linearly backward relative to the limiting tube 15. A portion of the outer sheath tube connector 14 can be sleeved on the outside of the limiting tube 15, for example, the sheath tube joint 141 of the outer sheath tube connector 14 can be sleeved on the outside of the limiting tube 15. A third locking portion 150 is provided axially on the limiting tube 15, and a fourth locking portion 17 is provided axially on the outer sheath tube connector 14. When the limiting tube 15 and the outer sheath tube connector 14 satisfy the sleeve relationship, the third locking portion 150 and the fourth locking portion 17 satisfy the radial locking relationship. The cooperation of the third locking portion 150 and the fourth locking portion 17 restricts the rotation of the outer sheath tube connector 14 relative to the limiting tube 15, that is, restricts its rotation relative to the rotor 12.
[0088] In addition, the limiting tube 15 also serves as a guide structure for the retraction of the outer sheath tube connector 14, which can guide the retraction of the outer sheath tube connector 14 and prevent it from getting stuck.
[0089] In one implementation, such as Figure 4 As shown, the limiting tube 15 can pass through the sheath joint 141 in the outer sheath connector 14 and be sleeved on the outside of the connecting rod 140. In another embodiment, as... Figure 1 As shown, the limiting tube 15 can be connected only to the sheath joint 141.
[0090] In one embodiment, the third snap-fit portion 150 is a third snap-fit groove 1500 provided on the limiting tube 15, the third snap-fit groove 1500 extends along the axial direction of the limiting tube 15, and the fourth snap-fit portion 17 is a fourth snap-fit protrusion 170.
[0091] Specifically, the third locking groove 1500 is an elongated groove, the length of which needs to meet the retraction stroke of the outer sheath tube connector 14. The third locking groove 1500 can be provided on both sides of the limiting tube 15. The fourth locking protrusion 170 is provided on the outer wall of the outer sheath tube connector 14 and extends radially, preferably provided on the connecting rod 140 of the outer sheath tube connector 14. The fourth locking protrusion 170 and the third locking groove 1500 can engage and move relative to each other in the axial direction. Figure 2 As shown, the second locking protrusion 1610 and the fourth locking protrusion 170 on the connecting rod 140 can be two independent protrusions at opposite ends of the connecting rod 140, or they can be two parts of a long strip protrusion on the connecting rod 140, or as shown in the diagram. Figure 4 and Figure 5 As shown, the small protrusion at the distal end of the connecting rod 140 has two parts, one before and one after. For ease of mold opening during production, the two protrusions on the connecting rod 140 are preferred.
[0092] like Figure 4 and Figure 5 As shown, when the limiting tube 15 passes through the sheath joint 141 in the outer sheath connector 14 and is sleeved on the outside of the connecting rod 140, the second locking protrusion 1610 and the fourth locking protrusion 170 are preferably provided in the front and rear parts of the small protrusion at the far end of the connecting rod 140.
[0093] When the first locking groove 1600 is a groove located on the inner wall of the slider 13 and closed at its distal end, after the outer sheath tube 200 is retracted by pushing the outer sheath tube connector 14 through the slider 13, the position of the slider 13 on the rotor 12 is close to the proximal end of the rotor 12. At this time, if it is necessary to return the outer sheath tube connector 14 to its initial position, the slider 13 needs to be moved forward. When the first limiting part 16 is located between the slider 13 and the outer sheath tube connector 14, if it is necessary to control the slider 13 to move forward by rotating the rotor 12, the first limiting part 16 and the rotor 12 rotation must always be kept in check, that is, the connection between the slider 13 and the connecting rod 140 on the outer sheath tube connector 14 must be maintained, which is difficult to operate and takes a long time.
[0094] Therefore, in order to achieve rapid retraction of the outer sheath connector 14, such as Figure 2 As shown, in this embodiment, the distance between the sidewall of the first locking groove 1600 and the axis of the slider 13 is less than or equal to the inner radius of the slider 13. With this setting, the distance from the outermost edge of the second locking protrusion 1610 to the center of the connecting rod 140 is also less than or equal to the inner radius of the slider 13. After the first locking groove 1600 and the second locking protrusion 1610 cooperate, they can transmit thrust and, when the outer sheath connector 14 retracts, rotate the slider 13 (i.e., rotate the rotor 12) so that the second locking protrusion 1610 is completely misaligned with the first locking groove 1600. Then, the second locking protrusion 1610 can directly enter the slider 13, realizing the rapid retraction of the outer sheath connector 14.
[0095] like Figure 2 As shown, in order to facilitate the formation of the first snap-fit groove 1600, a boss 1601 is provided on the inner side of the slider 13 in this embodiment, and the first snap-fit groove 1600 is provided on the boss 1601.
[0096] In one embodiment of rotor 12, such as Figure 2 As shown, the rotor 12 includes a first rotating body 121 and a second rotating body 122 arranged opposite to each other. The first rotating body 121 and the second rotating body 122 are detachably fixedly connected, and the first rotating body 121 and the second rotating body 122 are provided with matching threads. Specifically, the cross-sections of the first rotating body 121 and the second rotating body 122 can be semicircular, and they form a cylindrical rotor 12 after being joined together. To facilitate connection, protrusions and grooves can be respectively provided on the end faces of the first rotating body 121 and the second rotating body 122 to ensure the accuracy of the connection.
[0097] Based on this, in order to prevent the slider 13 from detaching from the rotor 12 during movement, the first rotating body 121 and the second rotating body 122 are provided with first limiting end faces 126 at both ends, and the slider 13 is restricted from detaching by the first limiting end faces 126.
[0098] In another embodiment of rotor 12, such as Figure 3 As shown, rotor 12 is a one-piece structure.
[0099] Based on this, in order to facilitate the installation of the slider 13 and prevent the slider 13 from detaching from the rotor 12 during movement, a loading inlet 125 is provided at one end of the rotor 12, and a second limiting end face 124 is provided at the other end of the rotor 12. The slider 13 is loaded into the rotor 12 through the loading inlet 125. An end cover 123 is detachably provided on the loading inlet 125. The end cover 123 and the second limiting end face 124 are used to restrict the slider 13 from detaching.
[0100] According to another aspect of this application, such as Figures 6 to 9 As shown, a handle assembly for a medical device delivery device is provided, including the aforementioned sheath retraction structure and a handle body 1;
[0101] The rotor 12 is installed inside the handle body 1 and can rotate. The slider 13 is located inside the rotor 12. The outer sheath connector 14 is located inside the handle body 1 and is connected to the slider 13.
[0102] In this embodiment, the handle body 1 may include a first housing 100 and a second housing 101 that can be fastened together, and the rotor 12 may be installed between the first housing 100 and the second housing 101. In one embodiment, to facilitate the rotation of the rotor 12, bearings may be fitted onto both ends of the rotor 12, and the bearings are pressed and fixed between the first housing 100 and the second housing 101, thereby positioning the rotor 12. To facilitate the rotation of the rotor 12, at least a portion of the rotor 12 is exposed on the handle, or a rotatable rotating sleeve may be provided on the handle, and the rotating sleeve is fitted and fixed onto the rotor 12. Taking the limiting tube 15 as an example, the second limiting part may have corresponding pressure plates 18 provided on the inner sides of the first housing 100 and the second housing 101. After the first housing 100 and the second housing 101 are fastened together, the limiting tube 15 can be pressed and fixed by the pressure plates 18. Of course, the limiting tube 15 may also be fixed inside the handle in other ways, which is not limited in this embodiment. In one embodiment, the distal end of the limiting tube 15 can be inserted into the rotor 12 to support the rotor 12, and the rotor 12 can rotate on the limiting tube 15.
[0103] 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 retraction structure;
[0104] The sheath assembly includes an outer sheath 200 and a sheath core assembly 3. The rotor 12 is installed inside the handle body 1 and is rotatable. The slider 13 is disposed inside the rotor 12. The outer sheath connector 14 is disposed inside the handle body 1 and connected to the slider 13.
[0105] The sheath core assembly 3 is movably inserted into the outer sheath tube 200, and the outer sheath tube 200 is movably inserted into the handle body 1 and fixedly connected to the first end of the outer sheath tube connector 14.
[0106] The above description is merely a preferred embodiment of this utility model and is 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 retraction structure, wherein the sheath retraction structure is adapted to be mounted on the handle of an implantable medical device delivery device, characterized in that, include: A rotor, wherein the rotor is provided with threads; A slider, wherein a sliding part is provided on the slider, the sliding part engaging with the thread of the rotor, and the slider is driven to move by the rotation of the rotor; A limiting structure is provided to restrict the rotational movement of the slider relative to the rotor; An outer sheath tube connector, the first end of which is used to fix and connect the outer sheath tube, and the second end of which is connected to the slider, and the outer sheath tube connector is pushed back by the slider.
2. The outer sheath retraction structure according to claim 1, characterized in that, The inner wall of the rotor is provided with threads, and the slider is located inside the rotor.
3. The outer sheath retraction structure according to claim 1, characterized in that, The limiting structure includes a first limiting part and a second limiting part; The first limiting part is disposed between the slider and the second end of the outer sheath connector, and is used to limit the rotation of the slider relative to the outer sheath connector; The second limiting part is used to limit the rotational movement of the outer sheath connector relative to the rotor.
4. The outer sheath retraction structure according to claim 1, characterized in that, The second end of the outer sheath connector is axially aligned with the slider, so that the slider can push the outer sheath connector backward, and the outer sheath connector can be retracted independently and separated from the slider.
5. The outer sheath retraction structure according to claim 1, characterized in that, The sliding part includes a thread on the slider, and the slider is threadedly connected to the rotor.
6. The outer sheath retraction structure according to claim 1, characterized in that, The sliding part includes a protrusion provided on the slider, and the protrusion engages with the thread of the rotor.
7. The outer sheath retraction structure according to claim 6, characterized in that, The threads on the rotor include at least a first thread segment and a second thread segment, the first thread segment and the second thread segment being distributed along the retraction direction of the slider, and the pitch of the first thread segment being less than the pitch of the second thread segment.
8. The outer sheath retraction structure according to claim 3, characterized in that, The first limiting part includes a first locking part and a second locking part. The first locking part is disposed on the slider, and the second locking part is disposed at the second end of the outer sheath connector. The first locking part and the second locking part engage to limit the rotational movement of the slider relative to the rotor.
9. The outer sheath retraction structure according to claim 8, characterized in that, The first snap-fit portion is a first snap-fit groove located near the end of the slider, and the second snap-fit portion is a second snap-fit protrusion. The second snap-fit protrusion and the first snap-fit groove are inserted and engaged along the axial direction of the rotor.
10. The outer sheath retraction structure according to claim 3, characterized in that, The outer sheath connector includes a sheath joint and a connecting rod. The connecting rod is fixedly connected to the sheath joint. The first end of the connecting rod is used to fixally connect the outer sheath, and the second end of the connecting rod is used to connect to the slider. The first limiting part is provided between the second end of the connecting rod and the slider.
11. The outer sheath retraction structure according to claim 3, characterized in that, The second limiting part includes a limiting tube for fixing inside the handle body. A third locking part is provided on the limiting tube along the axial direction. The outer sheath tube connector is provided with a fourth locking part. The fourth locking part engages with the third locking part and can move relative to each other along the axial direction, so as to restrict the rotation of the outer sheath tube connector while allowing the outer sheath tube connector to move axially relative to the handle.
12. The outer sheath retraction structure according to claim 11, characterized in that, The third snap-fit part is a third snap-fit groove provided on the limiting tube, the third snap-fit groove extends along the axial direction of the limiting tube, and the fourth snap-fit part is a fourth snap-fit protrusion.
13. The outer sheath retraction structure according to claim 9, characterized in that, The distance between the sidewall of the first snap-fit groove and the axis of the slider is less than or equal to the inner radius of the slider.
14. The outer sheath retraction structure according to claim 1, characterized in that, The rotor includes a first rotating body and a second rotating body arranged opposite to each other. The first rotating body and the second rotating body are detachably fixedly connected, and the first rotating body and the second rotating body are provided with matching threads. The first rotating body and the second rotating body are provided with first limiting end faces at both ends, which restrict the slider from disengaging.
15. The outer sheath retraction structure according to claim 1, characterized in that, The rotor is a one-piece structure; One end of the rotor is provided with a loading inlet, and the other end of the rotor is provided with a second limiting end face. The slider is loaded into the rotor through the loading inlet. An end cover is detachably provided on the loading inlet. The end cover and the second limiting end face are used to restrict the slider from detaching.
16. A handle assembly, characterized in that, Includes the outer sheath retraction structure as described in any one of claims 1 to 15, and the handle body; The rotor is installed inside the handle body and is rotatable. The slider is located inside the rotor. The outer sheath connector is located inside the handle body and is connected to the slider.
17. A conveyor, characterized in that, include: The sheath assembly, the handle body, and the outer sheath retraction structure as described in any one of claims 1 to 15; The sheath assembly includes an outer sheath and a sheath core assembly. The rotor is installed inside the handle body and is rotatable. The slider is located inside the rotor. The outer sheath connector is located inside the handle body and connected to the slider. The sheath core assembly is movably inserted into the outer sheath tube, and the outer sheath tube is movably inserted into the handle body and fixedly connected to the first end of the outer sheath tube connector.