Pushing device and interventional medical instrument

Abstract

The invention belongs to the technical field of medical apparatus and instruments, and provides a pushing device and an interventional medical instrument.The pushing device comprises a loading tube, a loader and a conveying catheter and further comprises a base, a push rod and a push rod, the limiting sleeve is arranged at the first end of the loading pipe and is in coupling connection with the conveying guide pipe through a coupling assembly; the sliding seat sleeves the limiting sleeve, is rotationally connected with the limiting sleeve and is in sliding connection with the base; the locking assembly is arranged on the sliding seat and has a locking state and an unlocking state; and the control assembly is arranged on the base and the sliding seat and is in transmission connection with the locking assembly, and when the screwing distance between the conveying guide pipe and the loading pipe reaches a preset distance, the control assembly switches the locking assembly into a locking state. According to the pushing device and the interventional medical instrument provided by the invention, when the screwing distance between the conveying catheter and the loading tube reaches a preset value, the limiting sleeve can be locked, so that the conveying catheter cannot rotate, and excessive or insufficient screwing of the conveying catheter can be avoided.

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 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 assembly includes a locking slider, the locking slider is slidably connected to the sliding seat, a side wall of the locking slider at one end facing the axis of the limiting sleeve is provided with a first blocking structure, and an outer side wall of the limiting sleeve is provided with a second blocking structure;

[0011] The locking slider has a third position and a fourth position, and the control component is transmission-connected to the locking slider. The control component places the locking slider in the third position so that the first blocking structure cooperates with the second blocking structure, thereby locking the limit sleeve. The control component places the locking slider in the fourth position so that the first blocking structure and the second blocking structure are separated, thereby releasing the lock on the limit sleeve.

[0012] Further, the first blocking structure comprises a first one-way limiting tooth and a second one-way limiting tooth arranged on a 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 matched with the first one-way limiting tooth and a fourth one-way limiting tooth matched with the second one-way limiting tooth, which are arranged on the outer side wall of the limiting sleeve;

[0014] In which, the control component places the locking slider in the third position so that the first one-way limit tooth and the third one-way limit tooth are engaged, and the second one-way limit tooth and the fourth one-way limit tooth are engaged, and the control component places the locking slider in the fourth position so that the first one-way limit tooth and the third one-way limit tooth are separated, and the second one-way limit tooth and the fourth one-way limit tooth are separated.

[0015] Furthermore, the control component comprises:

[0016] a first elastic member, two ends of which are respectively connected to the locking slider and the sliding seat, and in a natural state, the first elastic member provides 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, a first end of which is connected to the locking slider and a second end of which is connected to the base;

[0018] A second elastic member, two ends of which are respectively connected to the base and the sliding seat, and in a natural state, the second elastic member applies 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 has a first end fixedly connected to the locking slider and a second end extending outside the sliding seat.

[0020] Furthermore, the coupling assembly includes a limiting groove provided on the outer side wall of the delivery conduit and a limiting protrusion provided on the inner side wall of the limiting sleeve.

[0021] On the other hand, the present invention further provides an interventional medical device, comprising any one of the pushing devices described above.

[0022] Beneficial effects of the present invention:

[0023] The pushing device and interventional medical instrument 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 limit sleeve can be locked to prevent the delivery catheter from rotating, thereby preventing the delivery catheter from being screwed in too much or too little. BRIEF 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 is a brief introduction to the drawings required for the specific embodiments or the description of 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 according to the actual scale.

[0025] Figure 1 A three-dimensional view of a pushing device provided in the first embodiment of the present invention;

[0026] Figure 2 for Figure 1 A combined stereoscopic view of the locking assembly and the control assembly shown;

[0027] Figure 3 A three-dimensional view of a pushing device provided in the second embodiment of the present invention;

[0028] Figure 4 for Figure 3 A combined stereoscopic view of the locking assembly and the control assembly shown;

[0029] Figure 5 for Figure 4 An enlarged view of section A is shown.

[0030] Reference numerals:

[0031] 110, loading tube; 120, loader; 130, conveying catheter; 210, base; 220, limiting sleeve; 221, third one-way limiting tooth; 222, fourth one-way limiting tooth; 230, sliding seat; 310, locking slider; 311, first one-way limiting tooth; 312, second one-way limiting tooth; 410, first elastic member; 420, first pull rope; 430, second elastic member; 440, first operating arm; 450, third elastic member; 460, second operating arm; 471, locking socket; 472, locking pin; 481, fourth elastic member; 482, fifth elastic member; 483, reel; 484, second pull rope; 485, rack; 486, gear; 510, limiting groove; 520, limiting protrusion. DETAILED DESCRIPTION

[0032] The following embodiments of the technical solution of the present invention are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and are therefore only used as 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 common meanings understood by those skilled in the art to which the invention belongs.

[0034] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0035] In addition, the terms "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. In the description of the present invention, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

[0036] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0038] like Figure 1-5 As shown, the present invention provides a pushing device, including a loading tube 110, a loader 120 sleeved on the loading tube 110, and a delivery conduit 130 arranged at the first end of the loading tube 110 and threadedly connected to the loading tube 110, and also includes a base 210, a limit sleeve 220, a sliding seat 230, a locking assembly and a control assembly.

[0039] The base 210 is sleeved on the tube. The limiting sleeve 220 is arranged at the first end of the loading tube 110, and the limiting sleeve 220 is coupled with the delivery tube 130 through a coupling assembly, so that the delivery tube 130 can apply a force to the limiting sleeve 220, so that the limiting sleeve 220 can move synchronously with the delivery tube 130. That is, when the delivery tube 130 is rotated and the delivery tube 130 and the loading tube 110 are screwed together, the delivery tube 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 axis of the loading tube 110 toward the direction close to the base 210.

[0040] The sliding seat 230 is sleeved on the limiting sleeve 220 and is 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 .

[0041] The locking assembly is arranged on the sliding seat 230, and the locking assembly has a locking state and an unlocking state. In the working state, the locking assembly is placed in the locking state to lock the limiting sleeve 220, so that the limiting sleeve 220 cannot rotate. When the delivery conduit 130 is rotated, the delivery conduit 130 needs to drive the limiting sleeve 220 to rotate, and the delivery conduit 130 can rotate. Under the action of the locking assembly, the limiting sleeve 220 cannot rotate. Therefore, the limiting sleeve 220 applies a force to the delivery conduit 130, so that the delivery conduit 130 cannot rotate. The locking assembly is placed in the unlocking state to release the lock on the limiting sleeve 220, so that the limiting sleeve 220 can rotate, and then the delivery conduit 130 can rotate.

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

[0043] like Figure 2 , 4 As shown, the locking assembly includes a locking slider 310, which is slidably connected to the sliding seat 230. The side wall of the locking slider 310 at one end facing the axial line of the limiting sleeve 220 is provided with a first blocking structure, and the outer side wall of the limiting sleeve 220 is provided with a second blocking structure.

[0044] 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 matches the second blocking structure, thereby locking the limit 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 is separated from the second blocking structure, thereby releasing the lock on the limit sleeve 220.

[0045] Specifically, 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 the locking slider 310 at one end facing the axial center line 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 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 , which are arranged on the outer side wall of the limiting sleeve 220 .

[0047] Among them, the control component places the locking slider 310 in the third position so that the first one-way limit tooth 311 and the third one-way limit tooth 221 are engaged, and the second one-way limit tooth 312 and the fourth one-way limit tooth 222 are engaged. The control component places the locking slider 310 in the fourth position so that the first one-way limit tooth 311 and the third one-way limit tooth 221 are separated, and the second one-way limit tooth 312 and the fourth one-way limit tooth 222 are separated.

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

[0049] The two ends of the first elastic member 410 are connected to the locking slider 310 and the sliding seat 230 respectively. 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, so that when the external force applied to the locking slider 310 disappears, the locking slider 310 can move from the fourth position to the third position under the action of the elastic force of the first elastic member 410. 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 pull rope 420 is connected to the locking slider 310, and the second end is connected to the base 210. The two ends of the second elastic member 430 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 away from the base 210, so that 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 via a telescopic rod, and the two 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 the two 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, the first operating arm 440 applies a force to the locking slider 310, so that the locking slider 310 can overcome the elastic force of the first elastic member 410 and move from the third position to the fourth position.

[0053] like Figure 1 , 3 As shown, the coupling assembly includes a limiting groove 510 and a limiting protrusion 520 which are 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 disposed on the outer side wall of the delivery conduit 130 , and the limiting groove 510 is disposed 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 allow the delivery tube 130 to pass through the limiting sleeve 220. Then, the delivery tube 130 is rotated, and under the cooperation of the limiting groove 510 and the limiting protrusion 520, the delivery tube 130 rotates with the limiting sleeve 220. At the same time, in the process of the delivery tube 130 and the loading tube 110 being screwed together, the delivery tube 130 moves with the limiting sleeve 220, and the limiting sleeve 220 moves with the sliding seat 230 along the axis of the loading tube 110 toward the direction close to the base 210 by overcoming the elastic force of the second elastic member 430. Since the length of the first pull rope 420 remains unchanged, under the action of the elastic force of the first elastic member 410, the first elastic member 410 drives the locking slider 310 to move toward the direction close to the limiting sleeve 220. When the screwing distance between the delivery catheter 130 and the loading tube 110 reaches a preset distance, the delivery catheter 130 moves the preset distance with the sliding seat 230, and the first elastic member 410 drives the locking slider 310 to move to the third position, thereby locking the limit sleeve 220, thereby preventing the delivery catheter 130 from rotating.

[0056] When the delivery catheter 130 needs to be disassembled, the locking slider 310 is moved from the third position to the fourth position by the first operating arm 440 , thereby releasing the lock on the limiting sleeve 220 , thereby achieving the purpose of rotating the delivery catheter 130 .

[0057] like Figure 3-5 As 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] The two ends of the third elastic member 450 are connected to the locking slider 310 and the sliding seat 230 respectively. In a natural state, the third elastic member 450 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, so that when the external force applied to the locking slider 310 disappears, 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. 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, the second operating arm 460 applies a force to the locking slider 310, 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 in 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 in the fourth position. In the non-working state, the locking structure is placed in the unlocked state to release the locking slider 310, so that the locking slider 310 can move from the fourth position to the third position under the elastic force of the third elastic member 450.

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

[0062] The locking socket 471 is provided on the side wall of the locking slider 310. The locking latch 472 is disposed in the sliding seat 230 and is slidably connected to the sliding seat 230. The locking latch 472 has a fifth position and a sixth position. In the working state, the locking latch 472 is placed in the fifth position so that the locking latch 472 can be inserted into the locking socket 471, thereby locking the locking slider 310, that is, locking the locking slider 310 in the fourth position. In the non-working state, the locking latch 472 is placed in the sixth position so that the locking latch 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, and the control structure is in transmission connection with the locking structure. In the working state, when the screwing distance between the delivery conduit 130 and the loading tube 110 reaches a preset value, the control structure switches the locking structure from the locked state to the unlocked state, thereby releasing the lock on the locking slider 310.

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

[0065] The two ends of the fourth elastic member 481 are connected to the locking pin 472 and the sliding seat 230 respectively, and in a natural state, the fourth elastic member 481 applies 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] The two ends of the fifth elastic member 482 are connected to the base 210 and the sliding seat 230 respectively, and in a natural state, the fifth elastic member 482 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, so that after the external force applied to the sliding seat 230 disappears, the sliding seat 230 can move in a direction 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 via a telescopic rod, and the two 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 the two ends of the fifth elastic member 482 are respectively abutted against the base 210 and the sliding seat 230.

[0068] The reel 483 is disposed on the sliding seat 230 and is rotatably connected to the sliding seat 230. The first end of the second pull rope 484 is fixedly connected to the locking pin 472, and the second end is connected to the reel 483. The driving structure is disposed 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, when the sliding seat 230 moves toward the direction close to the base 210, the driving structure drives the reel 483 to rotate in the positive direction to reel the second pull rope 484, and the second pull 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. When the sliding seat 230 moves away from the base 210, the driving structure drives the reel 483 to rotate in the reverse direction to release the second pull rope 484, so that the locking pin 472 can move from the sixth position to the fifth position under 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 fixedly connected to the power output shaft of the reel 483, and the gear 486 is meshed with the rack 485.

[0070] In addition, the present invention also 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 described. However, it is understood that embodiments of the present invention can be practiced without these specific details. In some instances, well-known methods, structures and techniques are not shown in detail so as not to obscure the understanding of this description.

[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 it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. 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 included in the scope of the claims and 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) is sleeved on the tube; a limiting sleeve (220), which is arranged at the first end of the loading tube (110) and is 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), and 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 assembly, which is arranged on the sliding seat (230) and has a locked state and an unlocked state; as well as A control component is arranged on the base (210) and the sliding seat (230), and is 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. 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.

2. The pushing device according to claim 1, characterized in that: 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, and 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). 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).

3. The pushing device according to claim 2, characterized in that: 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.

4. The pushing device according to claim 2 or 3, 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), and in a natural state, 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).

5. The pushing device according to claim 4, 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).

6. An interventional medical device, characterized in that: Comprising the pushing device described in any one of claims 1-5.

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