A pushing device and an interventional medical device

Abstract

The present invention belongs to the technical field of medical devices, and provides a pushing device and an interventional medical device, wherein the pushing device includes a loading tube, a loader and a delivery catheter, and further includes: a base, which is sleeved on the loading tube; a limiting sleeve, which is arranged at the first end of the loading tube and is coupled and connected to the delivery catheter through a coupling assembly; a sliding seat, which is sleeved on the limiting sleeve and is rotationally connected to the limiting sleeve and is slidingly connected to the base; a locking assembly, which is arranged on the sliding seat and has a locked state and an unlocked state; and a control assembly, which is arranged on the base and the sliding seat and is transmission-connected with the locking assembly, and when the screwing distance between the delivery catheter and the loading tube reaches a preset distance, the control assembly switches the locking assembly to a locked state. The pushing device and the interventional medical device provided by the present invention can lock the limiting sleeve when the screwing distance between the delivery catheter and the loading tube reaches a preset value, so that the delivery catheter cannot rotate, and can avoid excessive or insufficient screwing of the delivery catheter.

Description

Technical Field

[0001] The present invention relates to the technical field of medical instruments, and in particular to a pushing device and an interventional medical instrument. Background Art

[0002] The delivery system of intracavitary interventional devices includes a delivery catheter, a dilator, a loader, a hemostatic valve, and a pusher, etc. However, the loading tube in the current loader is often threadedly connected to the delivery catheter, and during use, it can only be judged based on personal experience whether the loading tube and the delivery catheter are properly matched, which usually causes the loading tube to be deformed due to excessive screwing, or the loading tube and the delivery catheter are not properly connected due to insufficient screwing. Summary of the invention

[0003] In view of the defects in the prior art, the purpose of the present invention is to provide a pushing device and an interventional medical device to solve or alleviate the above-mentioned technical problems existing in the prior art.

[0004] In order to achieve the above object, on the one hand, the present invention provides a pushing device, including a loading tube, a loader sleeved on the loading tube, and a delivery conduit arranged at a first end of the loading tube and threadedly connected to the loading tube, and further comprising:

[0005] A base, which is sleeved on the loading tube;

[0006] A limiting sleeve, which is arranged at the first end of the loading tube and is coupled to the delivery conduit through a coupling assembly, so that the delivery conduit can apply a force to the limiting sleeve, thereby enabling the limiting sleeve to move synchronously with the delivery conduit;

[0007] A sliding seat, which is sleeved on the limiting sleeve and rotatably connected to the limiting sleeve, and is slidably connected to the base, so that the sliding seat can move along the axis of the loading tube;

[0008] a locking assembly disposed on the sliding seat and having a locked state and an unlocked state; and

[0009] A control component is arranged on the base and the sliding seat, and is transmission-connected with the locking component. In a working state, the control component puts the locking component in an unlocked state so that the limit sleeve can rotate. When the screwing distance between the conveying catheter and the loading tube reaches a preset distance, the control component switches the locking component to a locked state so that the limit sleeve cannot rotate.

[0010] Further, the locking component includes a locking slider which is slidably connected to the sliding seat. A first blocking structure is provided on the side wall of one end of the locking slider facing the axis of the limiting sleeve, and a second blocking structure is provided on the outer side wall of the limiting sleeve.

[0011] Wherein, the locking slider has a third position and a fourth position. The control component is in transmission connection with the locking slider. The control component positions the locking slider at the third position so that the first blocking structure cooperates with the second blocking structure to lock the limiting sleeve. The control component positions the locking slider at the fourth position so that the first blocking structure and the second blocking structure are separated, thereby releasing the locking of the limiting sleeve.

[0012] Further, the first blocking structure includes a first one-way limiting tooth and a second one-way limiting tooth provided on the side wall of one end of the locking slider facing the axis of the limiting sleeve, and the limiting directions of the first one-way limiting tooth and the second one-way limiting tooth are opposite.

[0013] The second blocking structure includes a third one-way limiting tooth provided on the outer side wall of the limiting sleeve and adapted to the first one-way limiting tooth and a fourth one-way limiting tooth adapted to the second one-way limiting tooth.

[0014] Wherein, the control component positions the locking slider at the third position so that the first one-way limiting tooth meshes with the third one-way limiting tooth and the second one-way limiting tooth meshes with the fourth one-way limiting tooth. The control component positions the locking slider at the fourth position so that the first one-way limiting tooth and the third one-way limiting tooth are separated and the second one-way limiting tooth and the fourth one-way limiting tooth are separated.

[0015] Further, the control component includes:

[0016] A first elastic member, the two ends of which are respectively connected to the locking slider and the sliding seat. In the natural state, it provides an elastic force to the locking slider so that the locking slider has a tendency to move from the fourth position to the third position.

[0017] A first pull rope, the first end of which is connected to the locking slider and the second end of which is connected to the base.

[0018] A second elastic member, the two ends of which are respectively connected to the base and the sliding seat, and in the natural state, it applies an elastic force to the sliding seat so that the sliding seat has a tendency to move away from the base; and

[0019] A first operating arm, the first end of which is fixedly connected to the locking slider and the second end of which extends outside the sliding seat.

[0020] Further, the coupling component includes a limiting groove formed on the outer side wall of the delivery catheter and a limiting protrusion provided on the inner side wall of the limiting sleeve.

[0021] On the other hand, the present invention also provides an interventional medical device, including the pushing device described in any one of the above.

[0022] Advantages of the present invention:

[0023] The pushing device and the interventional medical device provided by the present invention have a simple structure and a reasonable design. When the screwing distance between the delivery catheter and the loading tube reaches a preset value, the limiting sleeve can be locked to prevent the delivery catheter from rotating, thereby avoiding excessive or insufficient screwing of the delivery catheter. Description of the drawings

[0024] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0025] Figure 1 A perspective view of the pushing device provided in the first embodiment of the present invention;

[0026] Figure 2 For Figure 1 The combined perspective view of the locking component and the control component shown;

[0027] Figure 3 A perspective view of the pushing device provided in the second embodiment of the present invention;

[0028] Figure 4 For Figure 3 The combined perspective view of the locking component and the control component shown;

[0029] Figure 5 For Figure 4 The enlarged view of part A shown.

[0030] Reference numerals:

[0031] 110. Loading tube; 120. Loader; 130. Delivery conduit; 210. Base; 220. Limit sleeve; 221. Third one-way limit tooth; 222. Fourth one-way limit tooth; 230. Sliding seat; 310. Locking slider; 311. First one-way limit tooth; 312. Second one-way limit tooth; 410. First elastic member; 420. First pulling rope; 430. Second elastic member; 440. First operating arm; 450. Third elastic member; 460. Second operating arm; 471. Locking jack; 472. Locking bolt; 481. Fourth elastic member; 482. Fifth elastic member; 483. Reel; 484. Second pulling rope; 485. Rack; 486. Gear; 510. Limit groove; 520. Limit projection. Detailed implementation mode

[0032] The embodiments of the technical solutions of the present invention will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to illustrate the technical solutions of the present invention more clearly, so they are only examples and cannot be used to limit the protection scope of the present invention.

[0033] It should be noted that unless otherwise specified, the technical terms or scientific terms used in this application should have the ordinary meanings understood by those skilled in the art to which the present invention belongs.

[0034] In the description of this application, it should be understood that the orientation or positional relationships indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. are based on the orientation or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention.

[0035] In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. In the description of the present invention, "a plurality" means two or more unless otherwise specifically defined.

[0036] In this application, unless otherwise clearly defined or limited, terms such as "install", "connect", "link", "fix", etc. shall be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] In this application, unless otherwise clearly defined or limited, the first feature being "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature can be that the first feature is directly above or obliquely above the second feature, or simply means that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "beneath" and "underneath" the second feature can be that the first feature is directly below or obliquely below the second feature, or simply means that the horizontal height of the first feature is lower than that of the second feature.

[0038] As Figures 1-5 shown, the present invention provides a pushing device, which includes a loading tube 110, a loader 120 sleeved on the loading tube 110, and a conveying conduit 130 arranged at the first end of the loading tube 110 and threadedly connected to the loading tube 110. It further includes a base 210, a limiting sleeve 220, a sliding seat 230, a locking assembly and a control assembly.

[0039] Among them, the base 210 is sleeved on the loading tube 110. The limiting sleeve 220 is arranged at the first end of the loading tube 110. The limiting sleeve 220 and the conveying conduit 130 are coupled and connected through a coupling assembly, so that the conveying conduit 130 can apply a force to the limiting sleeve 220, thereby enabling the limiting sleeve 220 to move synchronously with the conveying conduit 130. That is, when the conveying conduit 130 is rotated to screw the conveying conduit 130 and the loading tube 110 together, the conveying conduit 130 applies a force to the limiting sleeve 220 through the coupling assembly to drive the limiting sleeve 220 to rotate and move along the axial line of the loading tube 110 in the direction close to the base 210.

[0040] The sliding seat 230 is sleeved on the limiting sleeve 220 and rotatably connected to the limiting sleeve 220. The sliding seat 230 is slidably connected to the base 210, so that the sliding seat 230 can move along the axial line of the loading tube 110.

[0041] The locking component is arranged on the sliding seat 230 and has a locked state and an unlocked state. Among them, in the working state, the locking component is placed in the locked state to lock the limiting sleeve 220, so that the limiting sleeve 220 cannot rotate. When the conveying catheter 130 is rotated, since the conveying catheter 130 needs to drive the limiting sleeve 220 to rotate, the conveying catheter 130 can rotate only then. Under the action of the locking component, the limiting sleeve 220 cannot rotate. Therefore, the limiting sleeve 220 exerts a force on the conveying catheter 130, so that the conveying catheter 130 cannot rotate. The locking component is placed in the unlocked state to release the locking of the limiting sleeve 220, so that the limiting sleeve 220 can rotate, and further the conveying catheter 130 can rotate.

[0042] The control component is arranged on the base 210 and the sliding seat 230, and the control component is in transmission connection with the locking component. In the working state, the control component places the locking component in the unlocked state so that the limiting sleeve 220 can rotate; when the screwing distance between the conveying catheter 130 and the loading tube 110 reaches a preset distance, the control component switches the locking component to the locked state so that the limiting sleeve 220 cannot rotate. The limiting sleeve 220 exerts a force on the conveying catheter 130, so that the conveying catheter 130 cannot rotate.

[0043] As Figure 2 、 4 As shown, the locking component includes a locking slider 310. The locking slider 310 is slidably connected to the sliding seat 230. A first blocking structure is arranged on the side wall of one end of the locking slider 310 facing the axis of the limiting sleeve 220, and a second blocking structure is arranged on the outer side wall of the limiting sleeve 220.

[0044] Among them, the locking slider 310 has a third position and a fourth position, and the control component is in transmission connection with the locking slider 310. In the working state, the control component places the locking slider 310 in the third position so that the first blocking structure cooperates with the second blocking structure to lock the limiting sleeve 220. In the non-working state, the control component places the locking slider 310 in the fourth position so that the first blocking structure and the second blocking structure are separated, thereby releasing the locking of the limiting sleeve 220.

[0045] Specifically, as Figure 2 、 4 As shown, the first blocking structure includes a first one-way limiting tooth 311 and a second one-way limiting tooth 312 arranged on the side wall of one end of the locking slider 310 facing the axis of the limiting sleeve 220, and the limiting directions of the first one-way limiting tooth 311 and the second one-way limiting tooth 312 are opposite.

[0046] The second blocking structure includes a third one-way limiting tooth 221 adapted to the first one-way limiting tooth 311 and a fourth one-way limiting tooth 222 adapted to the second one-way limiting tooth 312, which are arranged on the outer side wall of the limiting sleeve 220.

[0047] Wherein, the control component positions the locking slider 310 at the third position so that the first one-way limiting tooth 311 meshes with the third one-way limiting tooth 221 and the second one-way limiting tooth 312 meshes with the fourth one-way limiting tooth 222. The control component positions the locking slider 310 at the fourth position so that the first one-way limiting tooth 311 is separated from the third one-way limiting tooth 221 and the second one-way limiting tooth 312 is separated from the fourth one-way limiting tooth 222.

[0048] As Figure 2 shown, in this embodiment, the control component includes a first elastic member 410, a first pulling rope 420, a second elastic member 430 and a first operating arm 440.

[0049] Both ends of the first elastic member 410 are respectively connected to the locking slider 310 and the sliding seat 230. In the natural state, the first elastic member 410 provides an elastic force to the locking slider 310, so that the locking slider 310 has a tendency to move from the fourth position to the third position. Thus, when the external force applied to the locking slider 310 disappears, under the action of the elastic force of the first elastic member 410, the locking slider 310 can move from the fourth position to the third position. Specifically, the first elastic member 410 can be a spring, a rubber band, a gas spring, a rubber spring, etc. In this embodiment, the first elastic member 410 is a spring.

[0050] The first end of the first pulling rope 420 is connected to the locking slider 310 and the second end is connected to the base 210. Both ends of the second elastic member 430 are respectively connected to the base 210 and the sliding seat 230, and in the natural state, the second elastic member 430 applies an elastic force to the sliding seat 230, so that the sliding seat 230 has a tendency to move away from the base 210. Thus, after the external force applied to the sliding seat 230 disappears, the sliding seat 230 can move away from the base 210 under the action of the elastic force of the second elastic member 430. Specifically, the second elastic member 430 can be a spring, a rubber band, a gas spring, a rubber spring, etc. In this embodiment, the second elastic member 430 is a spring.

[0051] Specifically, the sliding seat 230 is slidably connected to the base 210 through a telescopic rod, and both ends of the telescopic rod are respectively fixedly connected to the base 210 and the sliding seat 230. The second elastic member 430 is sleeved on the telescopic rod, and both ends of the second elastic member 430 are respectively abutted against the base 210 and the sliding seat 230.

[0052] The first end of the first operating arm 440 is fixedly connected to the locking slider 310, and the second end extends outside the sliding seat 230. In the working state, a force is applied to the locking slider 310 through the first operating arm 440, so that the locking slider 310 can move from the third position to the fourth position against the elastic force of the first elastic member 410.

[0053] As Figure 1 , 3 shown, the coupling assembly includes a limiting groove 510 and a limiting protrusion 520 respectively arranged on the outer side wall of the delivery conduit 130 and the inner side wall of the limiting sleeve 220.

[0054] In this embodiment, the limiting protrusion 520 is arranged on the outer side wall of the delivery conduit 130, and the limiting groove 510 is arranged on the inner side wall of the limiting sleeve 220.

[0055] In the working state, the limiting groove 510 and the limiting protrusion 520 are aligned to pass the delivery conduit 130 through the limiting sleeve 220. Then the delivery conduit 130 is rotated. Under the cooperation of the limiting groove 510 and the limiting protrusion 520, the delivery conduit 130 drives the limiting sleeve 220 to rotate together. At the same time, during the screwing process of the delivery conduit 130 and the loading tube 110, the delivery conduit 130 drives the limiting sleeve 220 to move, and the limiting sleeve 220 drives the sliding seat 230 to move along the axis of the loading tube 110 towards the direction close to the base 210 against the elastic force of the second elastic member 430. Since the length of the first pulling rope 420 remains unchanged, therefore, under the elastic force of the first elastic member 410, the first elastic member 410 drives the locking slider 310 to move towards the direction close to the limiting sleeve 220. When the screwing distance between the delivery conduit 130 and the loading tube 110 reaches the preset distance, the delivery conduit 130 drives the sliding seat 230 to move a preset distance, and the first elastic member 410 drives the locking slider 310 to move to the third position, thereby locking the limiting sleeve 220, and further preventing the delivery conduit 130 from rotating.

[0056] When it is necessary to disassemble the delivery conduit 130, the locking slider 310 is moved from the third position to the fourth position through the first operating arm 440, thereby releasing the locking of the limiting sleeve 220, and further achieving the purpose of being able to rotate the delivery conduit 130.

[0057] As Figures 3-5 shown, in this embodiment, the control assembly includes a third elastic member 450, a second operating arm 460, a locking structure and a control structure.

[0058] Both ends of the third elastic member 450 are respectively connected to the locking slider 310 and the sliding seat 230. In the natural state, the third elastic member 450 provides an elastic force to the locking slider 310, so that the locking slider 310 has a tendency to move from the fourth position to the third position. Thus, when the external force applied to the locking slider 310 disappears, under the action of the elastic force of the third elastic member 450, the locking slider 310 can move from the fourth position to the third position. Specifically, the third elastic member 450 can be a spring, a rubber band, a gas spring, a rubber spring, etc. In this embodiment, the third elastic member 450 is a spring.

[0059] The first end of the second operating arm 460 is fixedly connected to the locking slider 310, and the second end extends outside the sliding seat 230. In the working state, a force is applied to the locking slider 310 through the second operating arm 460, so that the locking slider 310 can overcome the elastic force of the third elastic member 450 and move from the third position to the fourth position.

[0060] The locking structure is used to lock the locking slider 310 at the fourth position. The locking structure has a locked state and an unlocked state. In the working state, the locking structure is placed in the locked state to lock the locking slider 310 at the fourth position. In the non-working state, the locking structure is placed in the unlocked state to release the locking of the locking slider 310, so that the locking slider 310 can move from the fourth position to the third position under the action of the elastic force of the third elastic member 450.

[0061] As Figure 4 、 5 shown, the locking structure includes a locking socket 471 and a locking pin 472.

[0062] The locking socket 471 is opened on the side wall of the locking slider 310. The locking pin 472 is arranged in the sliding seat 230 and is slidably connected to the sliding seat 230. The locking pin 472 has a fifth position and a sixth position. In the working state, the locking pin 472 is placed in the fifth position so that the locking pin 472 can be inserted into the locking socket 471 to lock the locking slider 310, that is, to lock the locking slider 310 at the fourth position. In the non-working state, the locking pin 472 is placed in the sixth position, so that the locking pin 472 is separated from the locking socket 471 to release the locking of the locking slider 310.

[0063] The control structure is arranged on the base 210 and the sliding seat 230. The control structure is in transmission connection with the locking structure. In the working state, when the screwing distance between the conveying conduit 130 and the loading pipe 110 reaches a preset value, the control structure switches the locking structure from the locked state to the unlocked state, thereby releasing the locking of the locking slider 310.

[0064] As Figure 4 、 5As shown, the control structure includes a fourth elastic member 481, a fifth elastic member 482, a reel 483, a second pulling rope 484, and a driving structure.

[0065] Both ends of the fourth elastic member 481 are respectively connected to the locking pin 472 and the sliding seat 230. In the natural state, the fourth elastic member 481 applies an elastic force to the locking pin 472, so that the locking pin 472 has a tendency to move from the sixth position to the fifth position. Specifically, the fourth elastic member 481 can be a spring, a rubber band, a gas spring, a rubber spring, etc. In this embodiment, the fourth elastic member 481 is a spring.

[0066] Both ends of the fifth elastic member 482 are respectively connected to the base 210 and the sliding seat 230. In the natural state, the fifth elastic member 482 applies an elastic force to the sliding seat 230, so that the sliding seat 230 has a tendency to move away from the base 210. Thus, after the external force applied to the sliding seat 230 disappears, the sliding seat 230 can move away from the base 210 under the action of the elastic force of the fifth elastic member 482. Specifically, the fifth elastic member 482 can be a spring, a rubber band, a gas spring, a rubber spring, etc. In this embodiment, the fifth elastic member 482 is a spring.

[0067] Specifically, the sliding seat 230 is slidably connected to the base 210 through a telescopic rod. Both ends of the telescopic rod are respectively fixedly connected to the base 210 and the sliding seat 230. The fifth elastic member 482 is sleeved on the telescopic rod, and both ends of the fifth elastic member 482 are respectively abutted against the base 210 and the sliding seat 230.

[0068] The reel 483 is arranged on the sliding seat 230 and is rotatably connected to the sliding seat 230. The first end of the second pulling rope 484 is fixedly connected to the locking pin 472, and the second end is connected to the reel 483. The driving structure is arranged on the base 210 and the sliding seat 230, and the driving structure is in transmission connection with the reel 483. In the working state, during the process of the sliding seat 230 moving towards the base 210, the driving structure drives the reel 483 to rotate forward to wind up the second pulling rope 484, and the second pulling rope 484 pulls the locking pin 472 to move, so that the locking pin 472 overcomes the elastic force of the third elastic member 450 and moves from the fifth position to the sixth position. During the process of the sliding seat 230 moving away from the base 210, the driving structure drives the reel 483 to rotate reversely to release the second pulling rope 484, so that the locking pin 472 can move from the sixth position to the fifth position under the action of the elastic force of the third elastic member 450.

[0069] Specifically, the driving structure includes a rack 485 and a gear 486. The rack 485 is fixedly connected to the base 210. The gear 486 is coaxially arranged with the reel 483 and is fixedly connected to the power output shaft of the reel 483, and the gear 486 meshes with the rack 485.

[0070] In addition, the present invention further provides an interventional medical device, including the pushing device described in any of the above embodiments.

[0071] In the description of the present invention, a large number of specific details are set forth. However, it can be understood that the embodiments of the present invention may be practiced without these specific details. In some instances, well-known methods, structures, and technologies have not been shown in detail so as not to obscure the understanding of this specification.

[0072] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be covered by the scope of the claims and the specification of the present invention.

Claims

1. A pushing device, comprising a loading tube (110), a loader (120) sleeved on the loading tube (110), and a delivery conduit (130) disposed at a first end of the loading tube (110) and threadedly connected to the loading tube (110), characterized in that: Also includes: A base (210) sleeved on the loading tube (110); a limiting sleeve (220) disposed at the first end of the loading tube (110), the limiting sleeve (220) being coupled to the delivery conduit (130) via a coupling assembly, so that the delivery conduit (130) can exert a force on the limiting sleeve (220), thereby enabling the limiting sleeve (220) to move synchronously with the delivery conduit (130); a sliding seat (230) which is sleeved on the limiting sleeve (220) and rotatably connected to the limiting sleeve (220); the sliding seat (230) is slidably connected to the base (210) so that the sliding seat (230) can move along the axis of the loading tube (110); A locking component, which is arranged on the sliding seat (230), and the locking component has a locked state and an unlocked state; as well as a control component, which is arranged on the base (210) and the sliding seat (230), the control component being in transmission connection with the locking component; in a working state, the control component puts the locking component in an unlocked state so that the limiting sleeve (220) can rotate; and when the screwing distance between the conveying conduit (130) and the loading tube (110) reaches a preset distance, the control component switches the locking component to a locked state so that the limiting sleeve (220) cannot rotate; The locking assembly comprises a locking slider (310), the locking slider (310) being slidably connected to the sliding seat (230), a side wall of the locking slider (310) at one end facing the axis of the limiting sleeve (220) being provided with a first blocking structure, and an outer side wall of the limiting sleeve (220) being provided with a second blocking structure; The locking slider (310) has a third position and a fourth position, the control component is in transmission connection with the locking slider (310), the control component places the locking slider (310) in the third position so that the first blocking structure cooperates with the second blocking structure, thereby locking the limiting sleeve (220), and the control component places the locking slider (310) in the fourth position so that the first blocking structure and the second blocking structure are separated, thereby releasing the locking of the limiting sleeve (220); The first blocking structure comprises a first one-way limiting tooth (311) and a second one-way limiting tooth (312) which are arranged on a side wall of the locking slider (310) at one end facing the axis of the limiting sleeve (220), and the limiting directions of the first one-way limiting tooth (311) and the second one-way limiting tooth (312) are opposite; The second blocking structure comprises a third one-way limiting tooth (221) matched with the first one-way limiting tooth (311) and a fourth one-way limiting tooth (222) matched with the second one-way limiting tooth (312) and arranged on the outer side wall of the limiting sleeve (220); The control component places the locking slider (310) in the third position so that the first one-way limiting tooth (311) and the third one-way limiting tooth (221) are meshed, and the second one-way limiting tooth (312) and the fourth one-way limiting tooth (222) are meshed; the control component places the locking slider (310) in the fourth position so that the first one-way limiting tooth (311) and the third one-way limiting tooth (221) are separated, and the second one-way limiting tooth (312) and the fourth one-way limiting tooth (222) are separated.

2. The pushing device according to claim 1, characterized in that: The control component comprises: a first elastic member (410), two ends of which are respectively connected to the locking slider (310) and the sliding seat (230); in a natural state, the first elastic member (410) provides elastic force to the locking slider (310), so that the locking slider (310) has a tendency to move from the fourth position to the third position; A first pull rope (420), a first end of which is connected to the locking slider (310) and a second end of which is connected to the base (210); a second elastic member (430), two ends of which are respectively connected to the base (210) and the sliding seat (230), and in a natural state, the second elastic member (430) applies elastic force to the sliding seat (230), so that the sliding seat (230) has a tendency to move in a direction away from the base (210); and A first operating arm (440) has a first end fixedly connected to the locking slider (310) and a second end extending outside the sliding seat (230).

3. The pushing device according to claim 2, characterized in that: The coupling assembly comprises a limiting groove (510) provided on the outer side wall of the delivery conduit (130) and a limiting protrusion (520) provided on the inner side wall of the limiting sleeve (220).

4. An interventional medical device, characterized in that: Comprising the pushing device described in any one of claims 1-3.

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