Self-expanding stent delivery device

Abstract

The invention discloses a self-expanding stent conveying device which comprises an outer pipe, an inner pipe, a handle shell, a transmission assembly and a thread driving assembly, the inner pipe is connected with a self-expanding stent and penetrates through the outer pipe in a sliding mode, and the outer pipe is used for containing the self-expanding stent; the transmission assembly is arranged in the handle shell and connected with the outer pipe and the inner pipe so as to drive the inner pipe and the outer pipe to move in opposite directions. A thread groove section is arranged on the peripheral wall of the handle shell, the thread driving assembly is arranged on the handle shell, the thread driving assembly is connected with the transmission assembly, the thread driving assembly is provided with a thread part meshed with the thread groove section, and the thread part of the thread driving assembly can be separated from or meshed with the thread groove section; therefore, the thread driving assembly linearly moves in the axial direction or circumferentially rotates along the handle shell, and the transmission assembly linearly moves in the axial direction along with the thread driving assembly, so that the self-expanding stent can be conveniently and accurately released.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of medical devices, in particular to a self-expandable stent delivery device. BACKGROUND

[0002] Implanting a self-expandable stent is an important means for treating vascular stenosis at present, and a delivery system is usually required to implant the self-expandable stent into the human body. At present, the stent delivery system mainly consists of a catheter assembly and a handle assembly, the catheter assembly includes an outer tube and an inner tube, the self-expandable stent is fixed on the inner tube and is radially compressed in the outer tube. During the operation, the operator operates the delivery system to deliver the stent in the compressed state to the target site, determines the release position through the stent and the developing ring on the delivery system, controls the inner tube to be fixed, withdraws the outer tube to the outside, and releases the stent from the outer tube. The self-expandable stent has high shrinkage, and is in a compressed state before release. After release, the stent will be greatly shortened, causing deviation of the stent positioning. When the deviation is large, the stent needs to be repositioned and released again, which increases the operation time. In addition, the stent needs to be positioned accurately before release, and the stent needs to be released slowly and relatively uniformly, which requires higher experience and control ability of the operator. SUMMARY

[0003] The purpose of the embodiment of the present application is to provide a self-expandable stent delivery device which is not only convenient to operate, but also makes the stent positioning more accurate, thereby improving the release efficiency of the stent.

[0004] To solve the above technical problems, the embodiment of the present application provides a self-expandable stent delivery device, which comprises an outer tube, an inner tube, a handle shell, a transmission assembly and a threaded driving assembly.

[0005] The inner tube is connected with the self-expandable stent and slidably arranged in the outer tube, and the outer tube is used for accommodating the self-expandable stent in a contracted state.

[0006] The transmission assembly is arranged in the handle shell and connected with the outer tube and the inner tube, so as to drive the inner tube and the outer tube to move in opposite directions.

[0007] The handle shell has a threaded groove segment on the peripheral wall, the threaded driving assembly is arranged in the handle shell, the threaded driving assembly is connected with the transmission assembly, the threaded driving assembly has a threaded part engaged with the threaded groove segment, the threaded part of the threaded driving assembly can be separated from or engaged with the threaded groove segment, so that the threaded driving assembly moves linearly along the axial direction of the handle shell or rotates circumferentially, and the transmission assembly moves linearly along the axial direction of the handle shell when the threaded driving assembly moves linearly along the axial direction of the handle shell.

[0008] As an embodiment, the handle shell has linear sliding grooves symmetrically distributed and extending axially along the threaded groove segment; the threaded drive assembly comprises a connecting member and an elastic threaded sleeve;

[0009] The connecting member comprises a tubular part coaxially fixed at one end to the outer tube, and the inner tube passes through the other end of the tubular part, and the other end of the tubular part is symmetrically provided with a wing part, the connecting member is arranged in the handle shell, and the end of the wing part has a positioning part exposed to the linear sliding groove and in sliding fit with the threaded groove segment, so that the connecting member is coaxially arranged in the handle shell and can move along the linear sliding groove; the wing part is provided with a protrusion connected with the transmission assembly;

[0010] The elastic threaded sleeve comprises a large-diameter part and a main body part connected in sequence from far to near, the diameter of the large-diameter part is larger than that of the main body part, the large-diameter part has an annular sliding groove for accommodating the positioning part, and the annular sliding groove is in sliding fit with the positioning part to enable the elastic threaded sleeve to rotate circumferentially relative to the connecting member.

[0011] As an embodiment, the threaded drive assembly further comprises a pressing member;

[0012] The elastic threaded sleeve comprises a first cylinder and a second cylinder in engagement; the main body part of the first cylinder and the second cylinder respectively has an elastic raised part, and the inner wall of the elastic raised part is provided with the threaded part;

[0013] The pressing member is annular and is sleeved on the elastic threaded sleeve, the inner wall of the pressing member has an inclined step matched with the elastic raised part, when the pressing member is axially moved to press the elastic raised part, the threaded part can be engaged with the threaded groove segment, and when the elastic raised part is released, the threaded part is separated from the threaded groove segment.

[0014] As an embodiment, the connecting member further comprises a drive head connected with the tubular part, the drive head is axially arranged side by side with the positioning part, can be exposed to the linear sliding groove and can move along the linear sliding groove, and reinforcing ribs are arranged between the drive head, the positioning part and the filling part.

[0015] As an embodiment, the handle shell comprises a first handle shell and a second handle shell in engagement, the handle shell comprises a large-diameter handle segment and a small-diameter handle segment connected in sequence from a distal end to a proximal end, the diameter of the large-diameter handle segment is larger than that of the small-diameter handle segment; the small-diameter handle segment is provided with the threaded groove segment and a smooth segment from the distal end to the proximal end, respectively, a notch for accommodating the drive head is arranged on the proximal end side of the large-diameter handle segment; and the diameter of the large-diameter handle segment is the same as that of the large-diameter part of the elastic threaded sleeve.

[0016] As an embodiment, the threaded driving assembly further comprises a limiting ring located at the proximal end side of the pressing member and fixedly sleeved on the threaded elastic sleeve and used for axially limiting the pressing member.

[0017] As an embodiment, the transmission assembly comprises a driving rack, a driven rack, a driving gear, a driven gear and a gear shaft.

[0018] The driving gear and the driven gear are coaxially fixedly connected with the gear shaft, the driving rack and the driven rack are arranged in parallel and located on both sides of the gear shaft when they are away from each other, the driving rack is engaged with the driving gear, and the driven rack is engaged with the driven gear.

[0019] As an embodiment, the driven rack is provided with a connecting seat close to the driving gear at the end away from the driven gear, the connecting seat is provided with a clamping groove, and the inner tube is clamped in the clamping groove.

[0020] The end of the driving rack away from the driving gear has a connecting groove, the threaded driving assembly has a protrusion matched with the connecting groove, and the transmission assembly and the threaded driving assembly are fixedly connected through the connecting groove and the protrusion.

[0021] As an embodiment, the inner wall of the handle shell is provided with a first guide rail and a second guide rail, the driving rack is provided with a first sliding groove extending along its own axis and towards the first guide rail, and the driving rack and the handle shell are slidingly matched through the first sliding groove and the first guide rail; the driven rack is provided with a second sliding groove extending along its own axis and towards the second guide rail, and the driven rack and the handle shell are slidingly matched through the second sliding groove and the second guide rail.

[0022] As an embodiment, the ratio of the diameters of the driving gear and the driven gear is greater than 1.

[0023] From the above technical solutions, it can be known that the embodiments of the present application have at least the following advantages and positive effects:

[0024] In the self-expanding stent delivery device of this invention, the threaded drive assembly is threadedly engaged with the handle housing, enabling it to move axially along the handle housing and rotate along the handle housing thread. The transmission assembly only follows the threaded drive assembly's axial linear movement. Therefore, the threaded drive assembly can be controlled to separate from the handle housing thread, allowing for rapid axial movement to quickly release the stent. The rotation of the threaded drive assembly can also be controlled to precisely adjust the stent's expansion shape. Simultaneously, the transmission assembly controls the inner and outer tubes to move in opposite directions to compensate for positional shifts caused by axial contraction during stent release, preventing shifts during the release process. Therefore, the self-expanding stent delivery device of this invention is not only easy to operate and has high release efficiency, but also provides accurate stent positioning, improving the success rate and efficiency of stent release. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. It is understood that the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0026] Figure 1 This is an exploded structural diagram of the self-expanding support conveying device shown in Figure 1;

[0027] Figure 3 A schematic diagram of the overall structure of the self-expanding support conveying device according to an embodiment of the invention is shown.

[0028] Figure 2 for Figure 1 A schematic diagram of the mating structure between the connector and the handle housing in the self-expanding support conveying device shown;

[0029] Figure 4 for Figure 1 An exploded view of the threaded drive assembly of the self-expanding support conveyor shown.

[0030] Figure 5 for Figure 1 A schematic diagram of the overall structure of the threaded drive assembly of the self-expanding support conveyor shown;

[0031] Figure 6 for Figure 1 A schematic diagram of the self-expanding support conveyor device when the threaded part separates from the linear chute;

[0032] Figure 7 for Figure 1 A schematic diagram of the structure of the self-expanding support conveyor device when the threaded part engages with the linear slide groove;

[0033] Figure 8 for Figure 1 A schematic diagram of the connectors and elastic threaded sleeves in the self-expanding support conveying device shown;

[0034] Figure 9 for Figure 1 A schematic diagram of the transmission assembly of the self-expanding support conveyor shown;

[0035] Figure 10 for Figure 1 The diagram shows the combined structure of the transmission assembly, threaded drive assembly, and conduit assembly of the self-expanding support conveying device.

[0036] In the diagram: 10. Outer tube; 11. Inner tube; 2. Handle housing; 20. First handle housing; 21. Second handle housing; 22. Large-diameter handle section; 23. Small-diameter handle section; 24. Threaded groove section; 25. Straight groove; 26. Smooth section; 27. Notch; 3. Transmission assembly; 31. Driving rack; 311. Connecting groove; 312. First groove; 32. Driven rack; 321. Clamping groove; 322. Second groove; 33. Driving gear; 34. Driven gear; 35. 4. Gear shaft; 4. Threaded drive assembly; 41. Connector; 410. Tubular part; 411. Wing-shaped part; 412. Positioning part; 413. Drive head; 414. Protrusion; 42. Elastic threaded sleeve; 421. Large diameter part; 4211. Annular groove; 422. Main body; 423. First cylinder; 424. Second cylinder; 425. Elastic raised part; 426. Threaded part; 43. Pressing part; 431. Inclined step; 44. Limiting ring; 5. Drain pipe. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the various embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, those skilled in the art will understand that many technical details have been presented in the various embodiments of the present invention to enable the reader to better understand the present invention. However, the technical solutions claimed in the present invention can be implemented even without these technical details and various changes and modifications based on the following embodiments.

[0038] In the description of this invention, it should be noted that the terms "upper," "lower," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0039] It should be noted that unless otherwise explicitly specified, the terms "connected", "connection" and the like should be interpreted broadly, for example, can be fixed connection, can also be detachable connection, or integrally connected; can be directly connected, can also be indirectly connected through intermediate medium, can be internal communication of two elements.

[0040] In the description of the present application, it should be noted that in the field of interventional medical devices, the proximal end refers to the end closer to the operator, and the distal end refers to the end farther away from the operator. The above definition is only for convenience of expression and cannot be understood as a limitation of the present application.

[0041] Please refer to Figures 1-10 As shown in the figure, the embodiment of the present application provides a self-expanding stent delivery device which can be used for convenient and accurate release of the self-expanding stent. The self-expanding stent delivery device of the embodiment of the present application comprises a catheter assembly, a handle shell 2, a transmission assembly 3 and a threaded drive assembly 4.

[0042] The catheter assembly comprises an outer tube 10 and an inner tube 11. The inner tube 11 is connected with the self-expanding stent and is slidably arranged in the outer tube 10. The outer tube 10 is used for accommodating the self-expanding stent in a contracted state.

[0043] The transmission assembly 3 is arranged in the handle shell 2 and is connected with the outer tube 10 and the inner tube 11, so as to drive the inner tube 11 and the outer tube 10 to move in opposite directions.

[0044] The outer peripheral wall of the handle shell 2 has a threaded groove segment 24. The threaded drive assembly 4 is arranged in the handle shell 2. The threaded drive assembly 4 is connected with the transmission assembly 3. The threaded drive assembly 4 has a threaded portion 426 which is engaged with the threaded groove segment 24. The threaded portion 426 of the threaded drive assembly 4 can be separated from or engaged with the threaded groove segment 24, so that the threaded drive assembly 4 moves linearly in the axial direction or rotates in the circumferential direction along the handle shell 2. When the threaded drive assembly 4 moves linearly in the axial direction or rotates in the axial direction, the transmission assembly 3 moves linearly in the axial direction along with the threaded drive assembly 4. Therefore, the rapid release of the self-expanding stent can be controlled by controlling the axial movement of the threaded drive assembly 4 along the handle shell 2. Meanwhile, the circumferential rotation of the threaded drive assembly 4 along the handle shell 2 can also be controlled. At this time, the transmission assembly 3 can only move in the axial direction along with the threaded drive assembly 4. The outer tube 10 and the inner tube 11 can move in the axial direction in opposite directions synchronously. Therefore, when the outer tube 10 is withdrawn to release the self-expanding stent, the inner tube 11 can be advanced to compensate the axial contraction caused by the expansion of the self-expanding stent, so that the positioning of the stent will not be deviated, thereby improving the positioning accuracy of the stent release.

[0045] The handle housing 2 may include a first handle housing 20 and a second handle housing 21 that engage with each other. The first handle housing 20 and the second handle housing 21 are fastened and fixedly connected by a series of pin holes. The handle housing 2 includes a large-diameter handle section 22 and a small-diameter handle section 23 connected sequentially from the distal end to the proximal end, with the diameter of the large-diameter handle section 22 being larger than the diameter of the small-diameter handle section 23. The large-diameter handle section 22 is easy to grip. The proximal end of the large-diameter handle section 22 of the handle housing 2 has a notch 27 for accommodating the drive head 413 (see below) on the connector 41 of the threaded drive assembly 4. The small-diameter handle section 23 has a threaded groove section 24 and a smooth section 26 from the distal end to the proximal end. There is a definite numerical relationship between the distance the threaded drive assembly 4 moves axially along the threaded groove section 24 and the distance the transmission assembly 3 synchronously drives the inner tube 11 and outer tube 10 to move in opposite directions. When the inner tube 11 and outer tube 10 move in opposite directions within a certain distance range, the self-expanding bracket can switch between contraction and expansion states. Therefore, the length range of the threaded groove section 24 can be determined based on the range of the distance the inner tube 11 and outer tube 10 move in opposite directions. The smooth section 26 can limit the axial movement distance of the threaded drive assembly 4 in the handle housing 2, thereby limiting the self-expanding bracket from exceeding the set expansion state. The handle housing 2 has symmetrically distributed straight grooves 25 extending axially along the threaded groove section 24. The straight grooves 25 allow the exposed parts of the threaded drive assembly 41 that protrude from the handle housing 2 to move axially along the handle housing 2. This embodiment does not impose specific limitations on the structure of the handle housing 2.

[0046] Please see Figure 9 , Figure 10 As shown, the transmission assembly 3 may include: a driving rack 31, a driven rack 32, a driving gear 33, a driven gear 34, and a gear shaft 35. The driving gear 33 and driven gear 34 are coaxially and fixedly connected to the gear shaft 35. The driving rack 31 and driven rack 32 are arranged parallel to each other and located on opposite sides of the gear shaft 35 when they are far apart. The driving rack 31 meshes with the driving gear 33, and the driven rack 32 meshes with the driven gear 34. In other words, the driving rack 31 and driven rack 32 are coaxially and parallel to the handle housing 2. When the driving rack 31 moves in the first direction, it drives the driving gear 33 to rotate in the same direction as the driven gear 34, while the driven gear 34 drives the driven rack 32 to move axially in the opposite direction to the first direction. When the bracket is in the retracted state, the relative positions of the driving rack 31 and driven rack 32 are as follows: Figure 9 , Figure 10 As shown.

[0047] The end of the passive rack 32 away from the passive gear 34 is provided with a connecting seat close to the driving gear 33, the connecting seat is provided with a clamping groove 321, and the inner tube 11 is clamped in the clamping groove 321, so that the transmission assembly 3 can drive the inner tube 11 to move. The end of the driving rack 31 away from the driving gear 33 has a connecting groove 311, and the threaded driving assembly 4 has a protrusion 414 (see below) matched with the connecting groove 311. The transmission assembly 3 and the threaded driving assembly 4 are fixedly connected through the connecting groove 311 and the protrusion 414, so that the threaded driving assembly 4 can drive the transmission assembly 3 to move. Since the connecting piece 41 of the threaded driving assembly 4 is connected with the outer tube 10, the outer tube 10 and the driving rack 31 both follow the axial movement of the connecting piece 41, and the inner tube 11 moves synchronously and reversely with the outer tube 10.

[0048] It is worth mentioning that the diameter ratio of the driving gear 31 and the passive gear 32 can be greater than 1. The diameter ratio of the driving gear 31 and the passive gear is the speed ratio of the outer tube 10 and the inner tube 11 when moving reversely. According to the performance of the self-expanding stent when expanding, the speed of the inner tube 11 advancing and the speed of the outer tube 10 retreating, the relationship between the diameter or the number of teeth of the driving gear 31 and the passive gear 32 can be obtained, so that the self-expanding stent does not deviate during expansion, avoiding unnecessary prolonged operation time caused by the need to reposition due to deviation of the self-expanding stent when shrinking. For example, the diameter ratio of the driving gear 31 and the passive gear 32 can be 2, at this time, the speed of the driving gear 31 moving is 2 times the speed of the passive gear 32 moving when they move reversely, so that the moving speed of the outer tube 11 is 2 times the moving speed of the inner tube 10.

[0049] The inner wall of the handle shell 2 is provided with a first guide rail and a second guide rail, the driving rack 31 is provided with a first sliding groove 312 extending along its own axis and towards the first guide rail, and the driving rack 31 and the handle shell 2 are slidingly matched through the first sliding groove 312 and the first guide rail, so that the driving rack 31 can move axially in the handle shell 2. The passive rack 32 is provided with a second sliding groove 322 extending along its own axis and towards the second guide rail, and the passive rack 32 and the handle shell 2 are slidingly matched through the second sliding groove 322 and the second guide rail, so that the passive rack 32 can move axially in the handle shell 2.

[0050] The threaded driving assembly 4 can include a connecting piece 41, an elastic threaded sleeve 42, a pressing piece 43 and a limiting ring 44. The connecting piece 41 can include a tubular part 411, the tubular part 411 is coaxially fixedly connected with the outer tube 10 at one end, so that the threaded driving assembly 4 can drive the outer tube 10 to move axially. The inner tube 11 passes out from the other end of the tubular part 411. The other end of the tubular part 411 is symmetrically provided with a wing part 412, the connecting piece 41 is arranged in the handle shell 2 and the end of the wing part 412 has a positioning part 413 which exposes the linear sliding groove 25 and is in sliding fit with the threaded groove segment 24, so that the connecting piece 41 is coaxially arranged in the handle shell 2 and can move along the linear sliding groove 25. The wing part 412 is provided with a protrusion 414 which is connected with the transmission assembly 3. The protrusion 414 on the connecting piece 41 and the connecting groove 311 on the driving rack 31 of the transmission assembly 3 are in fit and fixation, so that the threaded driving assembly 4 can drive the transmission assembly 3 to move axially.

[0051] The connecting piece 41 further includes a driving head 413 which is connected with the tubular part 410, the driving head 413 is arranged axially parallel with the positioning part 412 and can expose the linear sliding groove 25 and move along the linear sliding groove 25, and the driving head 413 and the positioning part 412 are both provided with reinforcing ribs between them and the tubular part 410.

[0052] The elastic threaded sleeve 42 can include a large-diameter part 421 and a main body part 422 which are connected in sequence from far to near, the diameter of the large-diameter part 421 is larger than that of the main body part 422, and the diameter of the large-diameter handle segment 22 of the handle shell 2 can be the same as that of the large-diameter part 421 of the elastic threaded sleeve. The large-diameter part 421 has an annular sliding groove 4211 for accommodating the positioning part 413, the annular sliding groove 4211 is in sliding fit with the positioning part 413, so that the elastic threaded sleeve 42 can rotate circumferentially relative to the connecting piece 41, thereby making the connecting piece 41 not rotate helically but still move axially when the threaded driving assembly 4 moves helically, at this time, the displacement of the connecting piece 41 moving axially is the axial displacement component when the threaded driving assembly 4 moves helically.

[0053] The elastic threaded sleeve 42 can include a first sleeve body 423 and a second sleeve body 424 which are buckled together. The first sleeve body 423 and the second sleeve body 424 can be fixedly connected by pin holes buckling. The main body parts of the first sleeve body 423 and the second sleeve body 424 are respectively provided with elastic raised parts 425, and the inner walls of the elastic raised parts 425 are provided with threaded parts 426.

[0054] The pressing piece 43 is annular and is sleeved on the elastic threaded sleeve 42. The inner wall of the pressing piece 43 is provided with an inclined step 431 which is adapted to the elastic raised part 425. Please refer to Figure 7As shown, when the operation presser 43 presses the inclined step 431 against the elastic lifting part 425, such as when moving the presser 43 in the axial direction to the distal end (i.e. left in the figure), the threaded part 426 can engage with the threaded groove segment 24, at which time the threaded drive assembly 4 can rotate in the circumferential direction of the handle shell 2. The threaded part 426 is separated from the threaded groove segment 24 by default. Please refer to Figure 6 As shown, when moving the presser 43 in the axial direction to the proximal end (i.e. right in the figure), the elastic lifting part 425 can be released, and when the elastic lifting part 425 is released, the threaded part 426 is separated from the threaded groove segment 24, at which time the threaded drive assembly 4 can move in the axial direction of the handle shell 2. The presser 43 can be circumferentially open to have the ability of radial expansion and contraction, so as to facilitate the axial movement of the presser 43 to press or release the elastic lifting part 425. It can be understood that the elastic threaded sleeve 42 and the presser 43 can also adopt other structures, such as pressing the elastic lifting part on the elastic threaded sleeve 42 by circumferentially rotating the presser 43 to press the threaded part on the elastic lifting part, and the present embodiment does not specifically limit the structure of the elastic threaded sleeve and the presser, as long as it is convenient to separate or engage the threaded part with the threaded groove segment, so as to make the threaded drive assembly move axially or rotate.

[0055] The limiting ring 44 is located on the proximal end side of the presser 43 and is fixedly sleeved on the threaded elastic sleeve 42 and used for axially limiting the presser 43.

[0056] The self-expanding stent delivery device further comprises a venting tube 5 connected with the handle shell 2, used for venting air between the catheter assembly.

[0057] Compared with the prior art, in the self-expanding stent delivery device of the embodiment of the present application, the threaded drive assembly is threadedly connected with the handle shell, which can move axially along the handle shell and rotate in the threaded direction of the handle shell, and the transmission assembly only moves axially linearly with the threaded drive assembly, so that the threaded drive assembly can be controlled to separate from the handle shell in the threaded direction to drive the threaded drive assembly to move axially quickly to release the stent quickly, and the threaded drive assembly can also be controlled to rotate to accurately adjust the expansion mode of the stent, and at the same time, the transmission assembly controls the inner tube and the outer tube to move in opposite directions to each other to compensate for the positional deviation caused by the axial contraction of the stent during the release of the stent, so as to prevent the deviation during the release of the stent. Therefore, the self-expanding stent delivery device of the embodiment of the present application is not only convenient to operate, has high release efficiency and accurate stent positioning, but also improves the success rate and efficiency of stent release.

[0058] Those skilled in the art can understand that the above-mentioned embodiments are specific embodiments for implementing the present application, and in actual application, various changes can be made in form and details without departing from the spirit and scope of the present application.

Claims

1. A self-expanding stent delivery device, characterized by, The application relates to a handle assembly for a self-expanding stent delivery system. The handle assembly comprises an outer tube, an inner tube, a handle housing, a transmission assembly and a threaded driving assembly. The inner tube is connected with the self-expanding stent and is slidably arranged in the outer tube, and the outer tube is used for accommodating the self-expanding stent in a contracted state. The transmission assembly is arranged in the handle housing and is connected with the outer tube and the inner tube, so as to drive the outer tube and the inner tube to move in opposite directions. The handle housing has a threaded groove segment on the outer wall, the threaded driving assembly is arranged in the handle housing, the threaded driving assembly is connected with the transmission assembly, the threaded driving assembly has a threaded part which is engaged with the threaded groove segment, the threaded part of the threaded driving assembly can be separated from or engaged with the threaded groove segment, so that the threaded driving assembly moves linearly along the handle housing in the axial direction or rotates in the circumferential direction, and the transmission assembly moves linearly along the handle housing in the axial direction when the threaded driving assembly moves linearly along the handle housing in the axial direction.

2. The self-expanding stent delivery device of claim 1, wherein, The handle housing has linear sliding grooves which are symmetrically arranged and axially extend along the threaded groove segment, and the threaded driving assembly comprises a connecting piece and an elastic threaded sleeve. The connecting piece comprises a tubular part which is coaxially fixedly connected with the outer tube, the inner tube passes through the other end of the tubular part, the other end of the tubular part is symmetrically provided with wing-shaped parts, the connecting piece is arranged in the handle housing, the end of the wing-shaped part has a positioning part which is exposed from the linear sliding groove and is slidably matched with the threaded groove segment, so that the connecting piece is coaxially arranged in the handle housing and can move along the linear sliding groove, and the wing-shaped part is provided with a protrusion which is connected with the transmission assembly. The elastic threaded sleeve comprises a large-diameter part and a main body part which are sequentially connected from the distal end to the proximal end, the diameter of the large-diameter part is larger than that of the main body part, the large-diameter part is internally provided with an annular sliding groove which is used for accommodating the positioning part, and the annular sliding groove is slidably matched with the positioning part, so that the elastic threaded sleeve can rotate in the circumferential direction relative to the connecting piece.

3. The self-expanding stent delivery device of claim 2, wherein, The threaded driving assembly further comprises a pressing piece. The elastic threaded sleeve comprises a first sleeve body and a second sleeve body which are buckled together, the main body part of the first sleeve body and the main body part of the second sleeve body are respectively provided with elastic lifting parts, and the inner wall of the elastic lifting part is provided with the threaded part. The pressing piece is annular and is sleeved on the elastic threaded sleeve, the inner wall of the pressing piece is provided with an inclined step which is matched with the elastic lifting part, the threaded part can be engaged with the threaded groove segment when the elastic lifting part is pressed by the inclined step through the axial movement of the pressing piece, and the threaded part is separated from the threaded groove segment when the elastic lifting part is released.

4. The self-expanding stent delivery device of claim 3, wherein, The connecting piece further comprises a driving head which is connected with the tubular part, the driving head is axially arranged in parallel with the positioning part, can be exposed from the linear sliding groove and can move along the linear sliding groove, and reinforcing ribs are arranged between the driving head, the positioning part and the filling part.

5. The self-expanding stent delivery device of claim 4, wherein, The handle shell comprises a first handle shell and a second handle shell which are buckled together, and comprises a large-diameter handle section and a small-diameter handle section which are connected in sequence from a distal end to a proximal end, wherein the diameter of the large-diameter handle section is larger than that of the small-diameter handle section; the small-diameter handle section is provided with the threaded groove section and the smooth section from the distal end to the proximal end, respectively; the large-diameter handle section is provided with a notch for accommodating the driving head on the proximal end side; and the diameter of the large-diameter handle section is the same as that of the large-diameter part of the elastic threaded sleeve.

6. The self-expanding stent delivery device of claim 3, wherein, The threaded driving assembly further comprises a limiting ring which is located on the proximal end side of the pressing piece and is fixedly sleeved on the threaded elastic sleeve and used for axially limiting the pressing piece.

7. The self-expanding stent delivery device of claim 1, wherein, The transmission assembly comprises a driving rack, a driven rack, a driving gear, a driven gear and a gear shaft; The driving gear and the driven gear are coaxially fixedly connected with the gear shaft, the driving rack and the driven rack are arranged in parallel and located on both sides of the gear shaft when they are away from each other, the driving rack is engaged with the driving gear, and the driven rack is engaged with the driven gear.

8. The self-expanding stent delivery device of claim 7, wherein, The distal end of the driven rack away from the driven gear is provided with a connecting seat close to the driving gear, the connecting seat is provided with a clamping groove, and the inner tube is clamped in the clamping groove; The distal end of the driving rack away from the driving gear has a connecting groove, the threaded driving assembly has a protrusion matched with the connecting groove, and the transmission assembly and the threaded driving assembly are fixedly connected through the connecting groove and the protrusion.

9. The self-expanding stent delivery device of claim 7, wherein, The inner wall of the handle shell is provided with a first guide rail and a second guide rail, the driving rack is provided with a first sliding groove which extends along the axial direction of the driving rack and is directed to the first guide rail, and the driving rack and the handle shell are slidingly matched through the first sliding groove and the first guide rail; the driven rack is provided with a second sliding groove which extends along the axial direction of the driven rack and is directed to the second guide rail, and the driven rack and the handle shell are slidingly matched through the second sliding groove and the second guide rail.

10. The self-expanding stent delivery device of claim 7, wherein, The ratio of the diameters of the driving gear and the driven gear is greater than 1.

Images