Stent conveying device

Abstract

The utility model relates to the technical field of medical instruments, in particular to a stent conveying device which comprises a screw tube, a sheath tube assembly and a regulation and control unit, the screw tube is hollow in the axial direction, and meshing threads are arranged on the screw tube; the sheath tube assembly is movably arranged in the screw tube; the regulation and control unit comprises a regulation and control handle and a buckle component; the regulation and control handle is arranged outside the solenoid in a sleeving manner and is connected with the sheathing canal assembly; the buckle component comprises a first buckle and a second buckle, the first buckle and the second buckle are connected at an angle, a thread part is arranged on the first buckle, when the thread part is meshed with the meshing thread, the regulation and control unit can rotate relative to the solenoid and move in the axial direction, and when the thread part is separated from the meshing thread, the regulation and control unit can slide in the axial direction relative to the solenoid; a rotating part is arranged at the joint of the first buckle and the second buckle, and the buckle component can rotate around the rotating part so that the thread part can be meshed with or separated from the meshing thread. The control unit is arranged to control the movement of the sheathing canal assembly, so that the sheathing canal can be accurately and efficiently controlled, and the covered stent can be released.

Description

Technical Field

[0001] The utility model relates to the technical field of medical devices, in particular to a stent delivery device. Background Art

[0002] Aortic dissection, also known as aortic dissection aneurysm, is a serious cardiovascular emergency. When a tear appears in the inner membrane of the arterial wall, blood enters the arterial wall through the tear to form a hematoma, and further peels off the inner membrane and middle membrane of the aorta, resulting in aortic dissection. The condition progresses rapidly, with a high early mortality rate, and the incidence is related to the growth of the population age.

[0003] In clinical medicine, interventional surgery has developed rapidly in the treatment of cardiovascular diseases due to its advantages such as minimally invasive and efficient. Installing a covered stent through interventional surgery is a common method for treating aortic dissection diseases. In interventional surgery, the compressed covered stent is delivered to the lesion site through the sheath of the stent delivery device and then released. The covered stent opens and adheres tightly to the lesion tube wall, isolating the blood flow and the lesion site, thereby eliminating the impact of blood flow on the lesion site and establishing a normal blood circulation channel.

[0004] However, it is difficult for existing stent delivery devices to balance precise and efficient control of the sheath and release of the covered stent, and there are problems such as inaccurate release position or long release time, which affect the success rate of the surgery. Summary of the Utility Model

[0005] Therefore, the technical problem to be solved by the utility model is to overcome the difficulty of existing stent delivery devices in balancing precise and efficient control of the sheath and release of the covered stent, and to provide a stent delivery device that can balance precise and efficient control of the sheath and release of the covered stent by setting a regulation unit to control the movement of the sheath assembly.

[0006] The utility model provides a stent delivery device, including a screw tube, the screw tube is axially hollow, and a meshing thread is provided on the radial outer surface of the screw tube; a sheath assembly, the sheath assembly is movably arranged in the screw tube; a regulation unit, the regulation unit includes a regulation handle and a buckle component; the regulation handle is sleeved outside the screw tube, and the regulation handle is connected to the sheath assembly; the buckle component includes a first buckle and a second buckle, the first buckle and the second buckle are angularly connected, a thread portion capable of meshing with the meshing thread is provided on the first buckle, when the thread portion meshes with the meshing thread, the regulation unit can rotate relative to the screw tube and move axially, when the thread portion is separated from the meshing thread, the regulation unit can slide axially relative to the screw tube, a rotating portion is provided at the connection of the first buckle and the second buckle, and the buckle component is configured to be able to rotate around the rotating portion to make the thread portion mesh with or separate from the meshing thread.

[0007] In one embodiment of the utility model, a first clamping portion is provided on the second buckle, and the regulating unit further comprises a second clamping portion adapted to the first clamping portion, and when the threaded portion is separated from the meshing thread, the second clamping portion is clamped with the first clamping portion.

[0008] In one embodiment of the utility model, the control unit also includes a rotating lock seat and a locking component. The rotating lock seat is arranged in the control handle and is sleeved on the outside of the screw tube. The snap component is rotatably connected to the rotating lock seat through the rotating part. The locking component can slide relative to the snap component to drive the snap component to rotate around the rotating part.

[0009] In one embodiment of the utility model, a first guide portion is axially provided on the surface of the rotating lock seat that contacts the locking component, and a second guide portion adapted to the first guide portion is axially provided on the surface of the locking component that contacts the rotating lock seat, and the second guide portion is slidably connected to the first guide portion.

[0010] In one embodiment of the utility model, a limit piece is provided on the rotating lock seat, and the limit piece includes a first limit surface and a second limit surface. When the buckle component rotates around the rotating part, the buckle component can abut the first limit surface or the second limit surface.

[0011] In an embodiment of the present invention, the regulating unit further comprises an elastic component for providing an elastic force to the locking component through the elastic component.

[0012] In one embodiment of the utility model, a limiting portion is provided on the end of the first buckle away from the second buckle, a first limiting groove adapted to the limiting portion is provided on the rotating lock seat, and a second limiting groove adapted to the limiting portion is provided on the locking component.

[0013] In one embodiment of the utility model, a through first opening is provided on the regulating handle, and a locking button is provided on the locking component, and the locking button passes through the first opening and out of the regulating handle.

[0014] In one embodiment of the utility model, a through guide groove is axially opened on the screw tube, a circumferential receiving groove is opened on the radial inner surface of the control handle, and the sheath assembly includes a sheath connector, at least part of the sheath connector passes through the guide groove out of the screw tube and is rotatably connected to the receiving groove.

[0015] In one embodiment of the present invention, the sheath tube assembly includes a sheath tube body and a guide wire tube inserted into the sheath tube body, and a guide tip is provided at the end of the guide wire tube.

[0016] The above technical solution of the present utility model has the following beneficial effects compared with the prior art:

[0017] For the stent delivery device of the present utility model, by providing a regulation unit including a buckle component, the sheath assembly can move relative to the screw tube in two ways. During use, only by rotating the buckle component to engage or disengage the threaded portion on its first buckle with the meshing thread of the sheath can the movement mode of the sheath assembly be changed, ensuring that the sheath assembly can balance the accuracy of position, improve the success rate of the operation, and quickly move to release and recover the stent, effectively avoiding the problems that the stent is displaced due to the long stent release time and the blood flow is blocked by the stent for a long time. Description of the Drawings

[0018] In order to make the content of the present utility model easier to be clearly understood, the following further details the present utility model according to the specific embodiments of the present utility model in conjunction with the drawings, wherein,

[0019] Figure 1 is a partial structural schematic diagram of the stent delivery device in the preferred embodiment of the present utility model;

[0020] Figure 2 is a first perspective sectional structural schematic diagram of the stent delivery device in the preferred embodiment of the present utility model;

[0021] Figure 3 is a partial sectional structural schematic diagram of the stent delivery device in the preferred embodiment of the present utility model;

[0022] Figure 4 is a structural schematic diagram of the buckle component in the preferred embodiment of the present utility model;

[0023] Figure 5 is a sectional structural schematic diagram of the buckle component in the preferred embodiment of the present utility model;

[0024] Figure 6 is a second perspective sectional structural schematic diagram of the stent delivery device in the preferred embodiment of the present utility model;

[0025] Figure 7 is a partial structural schematic diagram of the regulation unit in the preferred embodiment of the present utility model.

[0026] Description of the reference numerals in the drawings: 10, solenoid tube; 11, guiding groove; 20, sheath assembly; 21, sheath connecting member; 22, sheath body; 23, guide wire tube; 231, guiding tip; 30, regulating unit; 31, regulating handle; 311, first opening; 312, accommodating groove; 32, snap member; 321, first snap; 3211, threaded portion; 3212, limiting portion; 322, second snap; 3221, first engaging portion; 323, rotating portion; 33, rotating lock base; 331, second engaging portion; 332, first guiding portion; 333, limiting member; 3331, first limiting surface; 3332, second limiting surface; 334, abutting member; 335, first limiting groove; 336, second opening; 34, locking member; 341, second guiding portion; 342, second limiting groove; 343, locking button; 344, third opening; 35, elastic member. Detailed Description of the Invention

[0027] The present invention will be further described below in conjunction with the drawings and specific embodiments, so that those skilled in the art can better understand the present invention and implement it, but the embodiments given are not intended to limit the present invention.

[0028] Referring to Figure 1 , Figure 2 and Figure 3 as shown, the present invention discloses a stent delivery device, which includes a solenoid tube 10, a sheath assembly 20 and a regulating unit 30.

[0029] The solenoid tube 10 is axially hollow, and a meshing thread is provided on the radially outer surface of the solenoid tube 10, which is not shown in the drawings. By cooperating with the snap member 32 through the meshing thread, the regulating unit 30 can move axially along the solenoid tube 10 in a sliding or threaded connection manner, thereby driving the sheath assembly 20 to move relative to the solenoid tube 10.

[0030] The sheath assembly 20 belongs to the prior art and is used to release and retrieve the stent. Those skilled in the art can set the specific structure of the sheath assembly 20 according to actual needs. The sheath assembly 20 can be movably arranged inside the solenoid tube 10.

[0031] The regulating unit 30 is used to drive the sheath assembly 20 to move relative to the solenoid tube 10 and change the moving mode of the sheath assembly 20 according to actual needs.

[0032] Specifically, the regulating unit 30 includes a regulating handle 31 and a snap member 32. The regulating handle 31 is sleeved outside the solenoid tube 10, and the regulating handle 31 is connected to the sheath assembly 20. During use, by moving the regulating handle 31 relative to the solenoid tube 10, the sheath assembly 20 is driven to move relative to the solenoid tube 10.

[0033] The buckle component 32 includes a first buckle 321 and a second buckle 322. The first buckle 321 and the second buckle 322 are angularly connected to facilitate rotation and change the movement mode of the sheath tube assembly 20. Specifically, the first buckle 321 is provided with a threaded portion 3211 that can engage with the meshing thread.

[0034] When the threaded portion 3211 engages with the meshing thread, the regulating unit 30 can rotate relative to the screw tube 10 and move axially, that is, the regulating unit 30 and the screw tube 10 are in threaded transmission. This structure can accurately control the position of the sheath tube assembly 20, ensure that the stent can be released at the accurate position, and improve the success rate of the operation. When the threaded portion 3211 is separated from the meshing thread, the regulating unit 30 can slide axially relative to the screw tube 10. This structure can ensure that the sheath tube assembly 20 can move relative to the screw tube 10 at a faster speed, so as to realize the rapid release and recovery of the stent, effectively avoiding the problems that the stent is displaced due to the long release time of the stent and the blood flow is blocked by the stent for a long time. A rotating portion 323 is provided at the connection between the first buckle 321 and the second buckle 322. The buckle component 32 is configured to be able to rotate around the rotating portion 323 to make the threaded portion 3211 engage with or separate from the meshing thread. Since the first buckle 321 and the second buckle 322 are angularly connected, the rotating portion 323 can act as a fulcrum. When the buckle component 32 rotates, the threaded portion 3211 can move around the fulcrum, so as to engage with or separate from the meshing thread, change the movement mode of the sheath tube assembly 20, and realize rapid release or precise adjustment of the release position. Those skilled in the art can set the specific driving mode of the buckle component 32 according to actual needs, such as applying forces to the first buckle 321 and the second buckle 322 successively, as long as its rotation can be realized.

[0035] During the use of the stent delivery device, when facing the situation that the position of the sheath tube assembly 20 needs to be accurately controlled, by rotating the buckle component 32, the threaded portion 3211 on the first buckle 321 is engaged with the meshing thread on the screw tube 10, so that the regulating handle 31 can move relative to the screw tube 10 in a threaded transmission manner, ensuring the accuracy of the position of the sheath tube assembly 20. When facing the need to quickly move the sheath tube assembly 20, by rotating the buckle component 32, the threaded portion 3211 on the first buckle 321 is separated from the meshing thread on the screw tube 10, so that the regulating handle 31 can move relative to the screw tube 10 in a sliding manner, with high speed and efficiency.

[0036] For the stent delivery device described in the present utility model, by providing a regulation unit 30 including a snap component 32, the sheath assembly 20 can move relative to the screw tube 10 in two ways. During use, only by rotating the snap component 32 to engage or disengage the threaded portion 3211 on its first snap 321 with the meshing thread of the sheath can the movement mode of the sheath assembly 20 be changed, ensuring that the sheath assembly 20 can balance the accuracy of position, improve the success rate of the operation, and quickly move to release and retrieve the stent, effectively avoiding the problems of stent displacement caused by long-term blood flow impact due to too long stent release time and avoiding the problem of blood flow being blocked by the stent for a long time.

[0037] Refer to Figure 3 , Figure 4 and Figure 5 As shown in

[0038] Refer to Figure 2 , Figure 3 , Figure 6 and Figure 7 As shown in In some embodiments of the stent delivery device described in the present utility model, a first clamping portion 3221 is provided on the second snap 322, and the regulation unit 30 further includes a second clamping portion 331 adapted to the first clamping portion 3221. When the threaded portion 3211 is separated from the meshing thread, the second clamping portion 331 is clamped with the first clamping portion 3221. By providing this structure, the stability when the threaded portion 3211 and the meshing thread are engaged can be effectively ensured, preventing relative displacement between the two. Preferably, the first clamping portion 3221 is provided as a through hole or a blind hole, and the second clamping portion 331 is provided as a convex hemispherical structure. In some embodiments of the stent delivery device described in the present utility model, the regulation unit 30 further includes a rotary lock seat 33 and a locking component 34. Specifically, the rotary lock seat 33 is provided as a tubular structure, which is arranged in the regulation handle 31 and sleeved outside the screw tube 10; the snap component 32 is rotationally connected to the rotary lock seat 33 through a rotating portion 323. The locking component 34 can slide relative to the snap component 32 to drive the snap component 32 to rotate around the rotating portion 323. Preferably, the locking component 34 is arranged between the rotary lock seat 33 and the regulation handle 31, so that the user can drive the locking component 34 to realize the regulation of the snap component 32. During use, when the locking component 34 slides relative to the snap component 32 to the first snap 321 of the snap component 32, the threaded portion 3211 of the first snap 321 is engaged with the meshing thread of the sheath under the action of the locking component 34 to realize screw drive. When the locking component 34 slides relative to the snap component 32 to the second snap 322, the snap component 32 rotates around the rotating portion 323, so that the threaded portion 3211 on the first snap 321 is separated from the meshing thread of the sheath to realize sliding. The rotational drive of the snap component 32 is realized through this structure, with stable structure and high efficiency.

[0039] Further, referring to Figure 7 As shown, in some embodiments of the stent delivery device of the present utility model, a first guiding portion 332 is axially formed on the surface of the rotary locking seat 33 in contact with the locking member 34, and a second guiding portion 341 adapted to the first guiding portion 332 is axially formed on the surface of the locking member 34 in contact with the rotary locking seat 33. The second guiding portion 341 and the first guiding portion 332 are slidably connected. By providing this structure, the stability of the locking member 34 relative to the buckle member 32 during movement can be further ensured. Preferably, the first guiding portion 332 is provided as a groove, and the second guiding portion 341 is provided as a protrusion adapted to the groove.

[0040] Further, referring to Figure 3 and Figure 7 As shown, in some embodiments of the stent delivery device of the present utility model, a limiting member 333 is provided on the rotary locking seat 33. By providing the limiting member 333, a force can be provided to the buckle member 32 to prevent it from moving relative to the rotary locking seat 33. Specifically, the limiting member 333 includes a first limiting surface 3331 and a second limiting surface 3332. When the buckle member 32 rotates around the rotating portion 323, the buckle member 32 can abut against the first limiting surface 3331 or the second limiting surface 3332. Preferably, the buckle member 32 is provided as a triangular prism structure, and two of its side surfaces are the first limiting surface 3331 and the second limiting surface 3332 respectively. During the rotation of the buckle member 32, both the first limiting surface 3331 and the second limiting surface 3332 can cooperate with other components, such as other parts on the locking member 34 or the rotary locking seat 33, to realize the limiting of the buckle member 32.

[0041] Further, referring to Figure 3 and Figure 7 As shown, in some embodiments of the stent delivery device of the present utility model, the control unit 30 further includes an elastic member 35 for providing an elastic force to the locking member 34 through the elastic member 35. Those skilled in the art can set the specific elastic member 35 according to actual needs. Preferably, the elastic member 35 is provided as a spring, and the spring is sleeved on the rotary locking seat 33. A radially protruding abutting member 334 is provided on the rotary locking seat 33. One end of the spring abuts against the abutting member 334 and the other end abuts against the locking member 34 to provide an elastic force thereto and realize its reset. Preferably, the elastic member 35 provides an elastic force to the locking member 34 to ensure that the threaded portion 3211 of the buckle member 32 meshes with the meshing thread under normal circumstances. When rapid sliding is required, by applying a force to the locking member 34 and overcoming the elastic force of the elastic member 35, the threaded portion 3211 is separated from the meshing thread.

[0042] Further, referring to Figure 3 、Figure 4 and Figure 7 As shown in Figure 7 , in some embodiments of the stent delivery device of the present utility model, a limiting portion 3212 is provided at an end of the first buckle 321 away from the second buckle 322. A first limiting groove 335 adapted to the limiting portion 3212 is provided on the rotary lock base 33, and a second limiting groove 342 adapted to the limiting portion 3212 is provided on the locking member 34. By providing this structure, a force can be provided to the buckle member 32 to prevent it from moving relative to the rotary lock base 33.

[0043] Furthermore, referring to Figure 6 As shown in Figure 6 , in some embodiments of the stent delivery device of the present utility model, a through first opening 311 is provided on the adjustment handle 31, and a locking button 343 is provided on the locking member 34. The locking button 343 passes through the first opening 311 and extends outside the adjustment handle 31. By providing this structure, it is convenient for the user to move the locking member 34 through the locking button 343 to realize the control of the engagement and separation of the threaded portion 3211 and the meshing thread. The structure is simple and convenient for operation. Preferably, two buckle members 32 are provided, and the two buckle members 32 are arranged oppositely; along the circumferential direction of the screw tube 10, the locking button 343 is arranged between the two buckle members 32 to improve stability.

[0044] Preferably, referring to Figure 3 and Figure 7 As shown in Figure 3 and Figure 7 , a through second opening 336 is provided on the rotary lock base 33, and the threaded portion 3211 can be engaged with the meshing thread through the second opening 336; by providing the second opening 336, on the one hand, it is convenient for the threaded portion 3211 to be engaged with the meshing thread, and on the other hand, the buckle member 32 can be limited in cooperation with other parts through the second opening 336. Preferably, referring to Figure 3 and Figure 7 As shown in Figure 3 and Figure 7 , a through third opening 344 is provided on the locking member 34; by providing the third opening 344, a certain avoidance space can be provided for the buckle member 32, and its rotation action can be realized more conveniently.

[0045] Referring to Figure 7 As shown in Figure 7 , in some embodiments of the stent delivery device of the present utility model, a through guiding groove 11 is axially provided on the screw tube 10; a receiving groove 312 is circumferentially provided on the radial inner surface of the adjustment handle 31; the sheath tube assembly 20 includes a sheath tube connector 21, and at least a part of the sheath tube connector 21 passes through the guiding groove 11 and extends outside the screw tube 10 and is rotatably connected to the receiving groove 312.

[0046] Preferably, the sheath assembly 20 includes a tubular sheath body 22. A guide wire tube 23 is disposed inside the sheath body 22. A guiding tip 231 is provided at the end of the guide wire tube 23. This is a prior art, and its specific structure and uses will not be elaborated herein. The sheath connector 21 is connected to the sheath body 22. By providing this structure, whether the adjustment handle 31 slides relative to the screw tube 10 or is driven by a screw thread, the sheath assembly 20 located inside the screw tube 10 can achieve synchronous movement with the adjustment handle 31 through the sheath connector 21. The structure is simple and the space utilization rate is high. Preferably, there are two guiding grooves 11 and components on the sheath connector 21 corresponding to the guiding grooves 11, effectively ensuring the structural stability.

[0047] Working principle:

[0048] When it is necessary to precisely control the position of the sheath assembly 20, the locking member 34 is used to ensure that the threaded portion 3211 of the snap member 32 engages with the meshing thread of the screw tube 10, thereby achieving the axial movement of the sheath assembly 20 relative to the screw tube 10 in a screw drive manner. When it is necessary to quickly move the sheath assembly 20, by moving the locking button 343, the locking member 34 is made to move relative to the snap member 32 against the force of the spring. The snap member 32 rotates around the rotating portion 323 under the action of the locking member 34, causing its threaded portion 3211 to disengage from the meshing thread. At this time, the sheath assembly 20 can be quickly slid relative to the screw tube 10 by directly sliding the adjustment handle 31.

[0049] Obviously, the above embodiments are merely examples given for clear illustration and are not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to enumerate all the implementation manners here. And the obvious changes or modifications derived therefrom are still within the protection scope of the present invention.

Claims

1. A stent delivery device, characterized in that: include: A spiral tube, wherein the spiral tube is hollow in the axial direction and an engaging thread is provided on the radial outer surface of the spiral tube; a sheath assembly, the sheath assembly being movably disposed in the spiral tube; A control unit, the control unit includes a control handle and a buckle component; the control handle is sleeved outside the screw tube, and the control handle is connected to the sheath tube assembly; the buckle component includes a first buckle and a second buckle, the first buckle and the second buckle are connected at an angle, the first buckle is provided with a threaded portion that can engage with the engaging thread, when the threaded portion is engaged with the engaging thread, the control unit can rotate relative to the screw tube and move axially, when the threaded portion is separated from the engaging thread, the control unit can slide axially relative to the screw tube, a rotating portion is provided at the connection between the first buckle and the second buckle, and the buckle component is configured to be able to rotate around the rotating portion to enable the threaded portion to engage or separate with the engaging thread.

2. The stent delivery device according to claim 1, characterized in that: The second buckle is provided with a first clamping portion, and the regulating unit further comprises a second clamping portion adapted to the first clamping portion, and when the threaded portion is separated from the meshing thread, the second clamping portion is clamped with the first clamping portion.

3. The stent delivery device according to claim 1 or 2, characterized in that: The regulating unit also includes a rotating lock seat and a locking component. The rotating lock seat is arranged in the regulating handle and is sleeved on the outside of the screw tube. The buckle component is rotatably connected to the rotating lock seat through the rotating part. The locking component can slide relative to the buckle component to drive the buckle component to rotate around the rotating part.

4. The stent delivery device according to claim 3, characterized in that: A first guide portion is axially provided on the surface of the rotating lock seat contacting the locking component, and a second guide portion adapted to the first guide portion is axially provided on the surface of the locking component contacting the rotating lock seat, and the second guide portion is slidably connected to the first guide portion.

5. The stent delivery device according to claim 3, characterized in that: The rotary lock seat is provided with a limiting member, and the limiting member includes a first limiting surface and a second limiting surface. When the buckle component rotates around the rotating part, the buckle component can abut against the first limiting surface or the second limiting surface.

6. The stent delivery device according to claim 3, characterized in that: The regulating unit further comprises an elastic component for providing an elastic force to the locking component through the elastic component.

7. The stent delivery device according to claim 3, characterized in that: A limiting portion is provided on the end of the first buckle away from the second buckle, a first limiting groove adapted to the limiting portion is provided on the rotating lock seat, and a second limiting groove adapted to the limiting portion is provided on the locking component.

8. The stent delivery device according to claim 3, characterized in that: The regulating handle is provided with a first through opening, and the locking component is provided with a locking button, and the locking button passes through the first opening and out of the regulating handle.

9. The stent delivery device according to claim 1, characterized in that: The spiral tube is provided with a through guide groove in the axial direction, the radial inner surface of the regulating handle is provided with a circumferential receiving groove, and the sheath tube assembly includes a sheath tube connector, at least part of which passes through the guide groove out of the spiral tube and is rotatably connected to the receiving groove.

10. The stent delivery device according to claim 1 or 9, characterized in that: The sheath tube assembly comprises a sheath tube body and a guide wire tube inserted into the sheath tube body, and a guide tip is arranged at the end of the guide wire tube.

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