Adjustable curved sheath tube and stent delivery device

Abstract

The present invention provides an adjustable bending sheath tube for delivering a stent into a blood vessel, comprising: a flexible tube body; and a traction line, wherein one end of the traction line is fixedly connected to one end of the flexible tube body, and the other end of the traction line passes through the flexible tube body and passes into the flexible tube body until passing through the other end of the flexible tube body, and when the other end of the traction line is pulled, the traction line drives one end of the flexible tube body to approach the other end of the traction line to bend the flexible tube body. The present invention also provides a stent delivery device. The present invention provides an adjustable bending sheath tube and a stent delivery device that can effectively release a stent in a diseased blood vessel.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to an adjustable curved sheath tube and a stent delivery device. Background Art

[0002] Aortic diseases such as aortic aneurysm and aortic dissection are among the most deadly and difficult to treat vascular surgical diseases. Traditional treatments involve open surgery and artificial blood vessel replacement, which carries the risk of large surgical trauma and high mortality. In recent years, a minimally invasive and simple interventional surgical method has been developed, in which a covered stent is implanted into the diseased blood vessel. The covered stent adheres closely to the inner wall of the blood vessel, isolating the diseased part of the blood vessel from the blood flow. The covered stent allows normal blood circulation while protecting the diseased blood vessels and effectively repairing vascular lesions. However, how to provide an adjustable curved sheath and a stent delivery device that can effectively release the stent into the diseased blood vessel (including curved blood vessels) and improve the treatment effect of vascular diseases has become a technical problem that needs to be solved. Summary of the invention

[0003] The present invention provides a stent delivery device which can effectively release the stent to the diseased blood vessel.

[0004] On the one hand, the present invention provides an adjustable bend sheath tube, which is applied to a stent delivery device, comprising: a bendable tube body; and a traction wire, wherein one end of the traction wire is fixedly connected to one end of the bendable tube body, and the other end of the traction wire passes through the bendable tube body and passes into the bendable tube body until passing through the other end of the bendable tube body. When the other end of the traction wire is pulled, the length of one end of the traction wire outside the bendable tube body is reduced, and the bendable tube body is bent under the action of the traction wire.

[0005] On the other hand, the present invention provides a stent delivery device for releasing the stent into a blood vessel, comprising the adjustable bending sheath and a sheath adjustment component, wherein the sheath adjustment component is connected to the other end of the traction wire, and the sheath adjustment component is used to pull the traction wire.

[0006] By fixing one end of the traction line on the bendable tube body, when the other end of the traction line is pulled, the fixing part moves toward the other end of the traction line, and in this process, the bendable tube body bends; a part of the traction line is arranged outside the bendable tube body, and the other part of the traction line is arranged inside the bendable tube body, so that the traction line can extend along the bending arc of the bendable tube body, thereby preventing the traction line exposed outside the bendable tube body from scratching the blood vessel wall or other structures, thereby improving the user experience of the adjustable bending sheath tube. Moreover, by adjusting the shortened length of the traction line, the degree of bending of the adjustable bending sheath tube can be adjusted, so that the adjustable bending sheath tube can be inserted into blood vessels with different degrees of bending. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0008] Figure 1 It is a structural schematic diagram of a stent delivery device provided in an embodiment of the present invention.

[0009] Figure 2 It is a cross-sectional view of a stent delivery device provided by an embodiment of the present invention.

[0010] Figure 3 It is a cross-sectional view of an adjustable bending sheath tube provided in an embodiment of the present invention.

[0011] Figure 4 It is a cross-sectional view of a second adjustable bending sheath tube provided in an embodiment of the present invention.

[0012] Figure 5 It is a partial cross-sectional view of a third type of adjustable bending sheath tube provided in an embodiment of the present invention.

[0013] Figure 6 It is a partial cross-sectional view of a fourth type of adjustable bending sheath tube provided in an embodiment of the present invention.

[0014] Figure 7 It is a cross-sectional view of a sheath adjustment assembly in a stent delivery device provided in an embodiment of the present invention.

[0015] Figure 8 It is a partial perspective view of the proximal end of a stent delivery device provided by an embodiment of the present invention.

[0016] Fig. 9 It is a cross-sectional view of a sheath sliding assembly in a stent delivery device provided in an embodiment of the present invention.

[0017] Fig.10 It is a partially enlarged cross-sectional view of a switch in a sheath sliding assembly in a stent delivery device provided in an embodiment of the present invention.

[0018] Fig.11 It is a partial cross-sectional view of the distal end of a stent delivery device provided in an embodiment of the present invention.

[0019] Fig.12 It is an exploded view of a release component in a stent delivery device provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0020] The technical solution of the embodiment of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiment of the present invention. For ease of description, "proximal end", "distal end" and "first direction" are used, where "proximal end" refers to the end away from the operating end (handle end) of the stent delivery device, and "distal end" refers to the end close to the operating end of the stent delivery device, and "first direction" is the extension direction of the adjustable bending sheath tube and the stent delivery device.

[0021] See also Figure 1 and Figure 2 , Figure 1 A stent delivery device 100 is provided in an embodiment of the present invention. The stent delivery device 100 is used to release the stent 200 to the diseased part of the blood vessel. The stent 200 is composed of a tubular rigid wire stent 200 and a polymer film fixed to the outer peripheral surface of the tubular rigid wire stent 200. The tubular rigid wire stent 200 can be formed into a ring by folding elastic rigid wire in a Z shape, and then a plurality of rings are sutured or bonded together with a polymer film to form a coated stent 200. When in use, the stent 200 is axially compressed and loaded into the stent delivery device 100, which is then delivered to the diseased blood vessel by the stent delivery device 100 and then released. Due to the elastic force of the tubular rigid wire stent 200, it automatically returns to a straight tube and adheres to the inner wall of the blood vessel, isolating the diseased part of the blood vessel from the blood flow, thereby achieving the purpose of treatment.

[0022] See also Figure 3 , Figure 3 An adjustable bending sheath tube 4 is provided in an embodiment of the present invention, which is applied to a stent delivery device 100. The adjustable bending sheath tube 4 can be used to carry a stent 200 and deliver the stent 200 to a diseased blood vessel. The adjustable bending sheath tube 4 includes a flexible tube body 41 and a traction wire 42. One end of the traction wire 42 is fixedly connected to one end of the flexible tube body 41 (the proximal end of the flexible tube body 41). The other end of the traction wire 42 (the distal end of the traction wire 42) passes through the flexible tube body 42, and passes into the flexible tube body 42 until it passes through the other end of the flexible tube body 42 (the distal end of the flexible tube body 41). In other words, a portion of the traction wire 42 is arranged outside the outer tube wall of the flexible tube body 41. Another portion of the traction wire 42 is arranged inside the flexible tube body 41. When the other end of the traction wire 42 (the distal end of the traction wire 42 ) is pulled, the traction wire 42 drives one end of the bendable tube 41 to approach the other end of the traction wire 42 (the distal end of the traction wire 42 ) to bend the bendable tube 41 .

[0023] It can be understood that when the traction line 42 is disposed inside the bendable tube 41 , the extension direction of the traction line 42 is consistent with that of the bendable tube 41 . When the traction line 42 is disposed outside the bendable tube 41 , the traction line 42 extends close to the outer tube wall of the bendable tube 41 .

[0024] It can be understood that when the other end of the pulling wire 42 is pulled, the length of the pulling wire 42 outside the bendable tube 41 is reduced, and the bendable tube 41 is bent under the action of the pulling wire 42 .

[0025] By fixing one end of the traction wire 42 on the bendable tube 41, when the other end of the traction wire 42 is pulled, the fixing part moves toward the other end of the traction wire 42, and in this process, the bendable tube 41 bends; a part of the traction wire 42 is arranged outside the bendable tube 41, and the other part of the traction wire 42 is arranged inside the bendable tube 41, so that the traction wire 42 can extend along the bending arc of the bendable tube 41, thereby preventing the traction wire 42 exposed outside the bendable tube 41 from scratching the blood vessel wall or other structures, thereby improving the user experience of the adjustable bending sheath tube 4. Moreover, by adjusting the shortened length of the traction wire 42, the bending degree of the adjustable bending sheath tube 4 can be adjusted, so that the adjustable bending sheath tube 4 can be inserted into blood vessels with different bending degrees.

[0026] In a first possible implementation, see Figure 3 The outer tube wall of the bendable tube body 41 is provided with a fixing portion 411 and a first opening 412. One end of the traction wire 42 is fixed to the fixing portion 411. The other end of the traction wire 42 penetrates into the bendable tube body 41 through the first opening 412. That is, the traction wire 42 is exposed between the fixing portion 411 and the first opening 412.

[0027] Specifically, the fixing portion 411 may be a fixing ring, one end of the traction wire 42 is fixed between the fixing portion 411 and the outer peripheral wall of the bendable tube body 41, and the fixing portion 411 is tightly sleeved on the outer tube wall of the bendable tube body 41 to fix one end of the traction wire 42 to the fixing portion 411 of the bendable tube body 41. Of course, in other embodiments, the fixing portion 411 may also be a convex column. One end of the traction wire 42 may be tied to the fixing portion 411, or the traction wire 42 passes through the fixing portion 411 and the large end of the traction wire 42 abuts against the fixing portion 411, or the traction wire 42 may be fixed to the fixing portion 411 by welding, bonding, snap-fit ​​connection, etc., or one end of the traction wire 42 may be integrally formed with the fixing portion 411.

[0028] When the traction wire 42 is pulled, the traction wire 42 between the fixed portion 411 and the first opening 412 is shortened, and the traction wire 42 generates relative clamping forces on the fixed portion 411 and the first opening 412 of the bendable tube body 41 respectively. The fixed portion 411 and the first opening 412 of the bendable tube body 41 approach each other under the two clamping forces, so that the bendable tube body 41 between the fixed portion 411 and the first opening 412 is bent, thereby realizing the bending of the adjustable sheath tube 4.

[0029] For further information, see Figure 3 The outer tube wall of the bendable tube body 41 is further provided with a second opening 413. The first opening 412 is located between the second opening 413 and the fixing portion 411. The other end of the pulling wire 42 passes through the outer tube wall of the bendable tube body 41 through the second opening 413.

[0030] Understandable, see Figure 3 , the second opening 413 and the first opening 412 are spaced apart in the axial direction of the bendable tube 41. Specifically, when the traction wire 42 is pulled, the traction wire 42 between the first opening 412 and the second opening 413 is tightly attached to the bendable tube 41, so that the bendable tube 41 forms a support section for the traction wire 42, so that the force of the traction wire 42 can be evenly distributed on the inner wall between the first opening 412 and the second opening 413, avoiding excessive force on the local part of the bendable tube 41 and causing the surface of the bendable tube 41 to break, thereby improving the reliability and service life of the adjustable bending sheath tube 4.

[0031] For further information, see Figure 3 The first opening 412 and the second opening 413 are collinear along the axial direction of the bendable tube 41 .

[0032] Specifically, the second opening 413 is colinear with the first opening 412 in the axial direction of the bendable tube body 41 , so that the adjustable bending sheath tube 4 is bent in a plane, that is, the adjustable bending sheath tube 4 is bent along an arc into a hook shape.

[0033] For further information, see Figure 3 The outer wall of the bendable tube body 41 is further provided with a third opening 414. The second opening 413 is located between the third opening 414 and the first opening 412. The other end of the traction wire 42 passes through the third opening 414 and enters the bendable tube body 41.

[0034] In this embodiment, two sections of the traction wire 42 are arranged outside the bendable tube 41. When the traction wire 42 is pulled, the traction wire 42 exposed outside the bendable tube 41 is shortened, driving the bendable tube 41 between the fixed portion 411 and the first opening 412 and the bendable tube 41 between the second opening 413 and the third opening 414 to bend. The bending of two areas on the bendable tube 41 can enhance the bending degree and bending speed of the adjustable bending sheath tube 4, so that when the traction wire 42 is shortened, the bendable tube 41 can respond quickly and present a certain degree of bending.

[0035] See also Figure 3 When the bendable tube 41 is bent into an arc shape, the first bending area 401 of the bendable tube 41 is bent from the fixing portion 411 along the lower left side (such as Figure 4The second bending area 402 of the bendable tube 41 is bent from the second opening 413 along the lower right side (as shown in FIG. Figure 4 As shown in FIG. 4 , the bendable tube body 41 between the first opening 412 and the second opening 413 forms a bending inflection point of the bendable tube body 41. By adjusting the positions of the first opening 412 and the second opening 413 and the distance between them, the size and shape of the hook formed by the bendable tube body 41 can be adjusted to adapt to blood vessels of different thicknesses and different degrees of curvature, so as to improve the application range of the adjustable bend sheath tube 4.

[0036] For further information, see Figure 3 , the first opening 412, the second opening 413 and the third opening 414 are sequentially arranged along the axial direction of the bendable tube 41. Specifically, the first opening 412, the second opening 413 and the third opening 414 are collinear along the axial direction of the bendable tube 41, so that the bendable tube 41 is kept bent in one plane, and specifically, the bendable tube 41 can be bent into a hook shape.

[0037] In one possible implementation, see Figure 2 The outer tube wall of the bendable tube body 41 is further provided with a fourth opening 419 . The fourth opening 419 is close to the other end of the bendable tube body 41 , and the other end of the traction line 42 passes through the fourth opening 419 and out of the bendable tube body 41 .

[0038] In another possible implementation manner, different from the previous implementation manner, the fourth opening 419 is provided on the end surface of the other end of the bendable tube 41 . The other end of the traction wire 41 passes through the fourth opening 419 and out of the bendable tube 41 .

[0039] In conjunction with the above implementation, please refer to Figure 3 The bendable tube body 41 has an inner lining layer 416 and an outer lining layer 415 sleeved on the inner lining layer 416, and the outer lining layer 415 and the inner lining layer 416 are spaced apart to form an inner cavity 417. The first opening 412, the second opening 413, the third opening 414 and the fourth opening 419 are disposed on the outer lining layer 415 and communicate with the inner cavity 417. The traction wire 42 is partially disposed in the inner cavity 417.

[0040] It can be understood that the traction wire 42 is located in the inner cavity 417 of the bendable tube 41, and the inner lining layer 416 separates the traction wire 42 from other structures. When the traction wire 42 is pulled, the traction wire 42 will not be entangled with other structures, which can improve the bending efficiency of the bendable tube 41. In addition, the inner cavity 417 extends along the axial direction of the bendable tube 41, so that the traction wire 42 extends along the axial direction of the bendable tube 41.

[0041] It can be understood that the bendable tube 41 has a pre-bending angle in the initial state, and the pre-bending angle can be 5° to 90°. The pre-bending angle is set so that the bendable tube 41 bends along the pre-bending direction under the drive of the traction line 42, so that the adjustable sheath tube 4 can bend quickly along the preset bending direction, thereby improving the efficiency of the bending operation.

[0042] It can be understood that the maximum bending angle of the bendable tube 41 can be 120° to 200°, so that the adjustable sheath tube 4 can penetrate into a blood vessel with a greater degree of curvature, thereby increasing the use range of the stent 200 delivery device 100.

[0043] Specifically, the material of the traction wire 42 can be a material with certain structural strength and bendable. The traction wire 42 can be a stainless steel wire, a memory alloy wire, or a polymer material wire, etc. 1-5 traction wires 42 can be arranged in parallel.

[0044] In another possible implementation, see Figure 4 , a fixing portion 411 is provided inside the bendable tube body 41. One end of the traction wire 42 is fixed to the fixing portion 411. A first through hole 431 and a second through hole 432 are provided on the outer tube wall of the bendable tube body 41. The first through hole 431 is located between the second through hole 432 and the fixing portion 411. The traction wire 42 passes out of the bendable tube body 41 through the first through hole 431, and passes into the bendable tube body 41 through the second through hole 432.

[0045] In this embodiment, the structure of the fixing portion 411 may refer to the fixing portion 411 in the first embodiment, and will not be described in detail herein.

[0046] See also Figure 4 When the traction wire 42 is pulled, the traction wire 42 between the first through hole 431 and the second through hole 432 is shortened, and the traction wire 42 generates relative clamping forces on the first through hole 431 and the second through hole 432 of the bendable tube body 41 respectively. The first through hole 431 and the second through hole 432 of the bendable tube body 41 approach each other under the two clamping forces, so that the bendable tube body 41 between the first through hole 431 and the second through hole 432 is bent, thereby realizing the bending of the adjustable sheath tube 4.

[0047] For further information, see Figure 4 The outer tube wall of the bendable tube body 41 is further provided with a third through hole 433. The second through hole 432 is located between the third through hole 433 and the first through hole 431. The traction line 42 passes through the bendable tube body 41 through the third through hole 433. It can be understood that the traction line 42 passes through the outer tube wall of the bendable tube body 41 through the third through hole 433.

[0048] By setting the third through hole 433, when the traction line 42 is pulled, the traction line 42 between the fixed part 411 and the first through hole 431 and the traction line 42 between the second through hole 432 and the third through hole 433 are tightly attached to the flexible tube body 41, so that the flexible tube body 41 forms a supporting section for the traction line 42, so that the force of the traction line 42 can be evenly distributed on the inner wall between the fixed part 411 and the first through hole 431, and between the second through hole 432 and the third through hole 433, so as to avoid excessive local force on the flexible tube body 41 causing the surface of the flexible tube body 41 to break, thereby improving the reliability and service life of the adjustable bending sheath tube 4.

[0049] For further information, see Figure 4 The outer tube wall of the bendable tube body 41 is further provided with a fourth through hole 434. The fourth through hole 434 is located on the side of the third through hole 433 away from the second through hole 432. The traction line 42 passes through the fourth through hole 434 and enters the bendable tube body 41.

[0050] In this embodiment, two sections of the traction wire 42 are arranged outside the bendable tube 41. When the traction wire 42 is pulled, the traction wire 42 exposed outside the bendable tube 41 is shortened, driving the bendable tube 41 between the first through hole 431 and the second through hole 432 and the bendable tube 41 between the third through hole 433 and the fourth through hole 434 to bend. The two areas on the bendable tube 41 are bendable, which can enhance the bending degree and bending speed of the adjustable bending sheath tube 4, so that when the traction wire 42 is shortened, the bendable tube 41 can respond quickly and present a certain degree of bending.

[0051] For further information, see Figure 4 , the first through hole 431, the second through hole 432, the third through hole 433 and the fourth through hole 434 are sequentially arranged along the axial direction of the bendable tube 41. Specifically, the first through hole 431, the second through hole 432, the third through hole 433 and the fourth through hole 434 are collinear along the axial direction of the bendable tube 41, so that the bendable tube 41 is kept bent in one plane, and specifically, the bendable tube 41 can be bent into a hook shape.

[0052] For details, please refer to Figure 4 The bendable tube body 41 comprises an inner lining layer 416, an outer lining layer 415 sleeved on the inner lining layer 416, and an inner cavity 417 disposed between the outer lining layer 415 and the inner lining layer 416. The first through hole 431, the second through hole 432, the third through hole 433, and the fourth through hole 434 are disposed on the outer lining layer 415 and communicate with the inner cavity 417. The traction wire 42 partially extends in the inner cavity 417.

[0053] It can be understood that the traction wire 42 is disposed in the bendable tube 41, which means that the traction wire 42 is disposed in the inner cavity 417, and the inner cavity 417 is isolated from other structures by the inner lining layer 416. When the traction wire 42 is pulled, the traction wire 42 will not be entangled with other structures, which can improve the bending efficiency of the bendable tube 41. In addition, the inner cavity 417 extends along the axial direction of the bendable tube 41 to guide the traction wire 42 to extend along the axial direction of the bendable tube 41.

[0054] In conjunction with any of the above implementations, please refer to Figure 5 The bendable tube 41 has an opening 418. The traction wire 42 passes through the opening 418 to pass out of or into the bendable tube 41. The adjustable bending sheath tube 4 also includes an elastic seal 44. The elastic seal 44 is coated on the outer peripheral wall of the traction wire 42. The elastic seal 44 is arranged between the inner wall of the opening 418 and the traction wire 42; or the elastic seal 44 is arranged in the bendable tube 41 and seals the opening 418.

[0055] Specifically, the opening 418 may be the first opening 412 , the second opening 413 , and the third opening 414 in the first embodiment, or may be any one of the first through hole 431 to the fourth through hole 434 in the second embodiment.

[0056] Specifically, the elastic seal 44 can be sealed between the inner wall of the opening 418 and the outer wall of the traction line 42, and can also be arranged in the inner cavity 417 of the flexible tube body 41. The elastic seal 44 fits the outer lining layer 415 of the flexible tube body 41 and covers the opening 418.

[0057] Specifically, the elastic seal 44 is sealed between the traction wire 42 and the flexible tube 41 to prevent blood from penetrating into the flexible tube 41 through the gap between the flexible tube 41 and the traction wire 42 when the adjustable sheath tube 4 penetrates into the blood vessel.

[0058] Specifically, the elastic seal 44 is made of an elastic material, which may be elastic plastic, elastic rubber, elastic composite material, etc. When the elastic seal 44 covers the traction line 42, the elastic seal 44 is in a compressed state. When the traction line 42 is bent, the elastic seal 44 will deform along with the traction line 42 to keep covering the traction line 42. Therefore, when the traction line 42 is bent, the elastic seal 44 still keeps sealing between the bendable tube 41 and the traction line 42.

[0059] In conjunction with any of the above implementations, please refer to Figure 6The bendable tube body 41 has an opening 418 and a reinforcing layer 45 disposed in the opening 418. The traction line 42 passes through the opening 418 to pass through or enter the bendable tube body 41. The reinforcing layer 45 surrounds the outer peripheral wall of the traction line 42. The reinforcing layer 45 is used to increase the strength of the opening 418 of the bendable tube body 41. Specifically, the reinforcing layer 45 can be a wear-resistant and tear-resistant plastic or rubber or a polymer material or a composite material. In addition, the surface of the reinforcing layer 45 can also be a smooth surface to improve the smoothness between the traction line 42 and the bendable tube body 41.

[0060] The opening 418 may be the first opening 412 , the second opening 413 , and the third opening 414 in the first embodiment, or may be any one of the first through hole 431 to the fourth through hole 434 in the second embodiment.

[0061] By providing a reinforcement layer 45 at the opening 418 , the reinforcement layer 45 can prevent the traction wire 42 from tearing the bendable tube 41 when driving the bendable tube 41 to bend, thereby improving the reliability and service life of the adjustable bending sheath tube 4 .

[0062] It can be understood that the portion of the traction line 42 exposed outside the bendable tube 41 can also be three sections or more, which will not be described in detail here.

[0063] See also Figure 1 and Figure 2 The stent delivery device 100 includes the adjustable bending sheath tube 4 and the sheath tube adjustment component 6 described in any one of the above embodiments. The sheath tube adjustment component 6 is connected to the other end of the traction line 42. The sheath tube adjustment component 6 is used to pull the traction line 42 to drive the adjustable bending sheath tube 4 to bend.

[0064] The sheath adjustment component 6 is set to pull the traction wire 42 to make the adjustable sheath 4 bend. The bending degree of the adjustable sheath 4 is adjusted by adjusting the distance that the traction wire 42 moves by the sheath adjustment component 6, so that the bending degree of the adjustable sheath 4 matches the curvature of the blood vessel, which is beneficial for the stent delivery device 100 to deliver the stent 200 to the curved blood vessel.

[0065] In one possible implementation, see Figure 7The sheath adjustment assembly 6 includes a fixed sleeve 61 and a rotating sleeve 62. The fixed sleeve 61 is fixedly sleeved on the periphery of the adjustable bending sheath tube 4. The rotating sleeve 62 is slidably sleeved on the periphery of the adjustable bending sheath tube 4. The fixed sleeve 61 is threadedly connected to the rotating sleeve 62. The rotating sleeve 62 is connected to the other end of the traction line 42. When the rotating sleeve 62 is rotated, the rotating sleeve 62 moves away from the fixed sleeve 61, and the rotating sleeve 62 pulls the traction line 42 to make the adjustable bending sheath tube 4 bend.

[0066] By threading the fixed sleeve 61 and the rotating sleeve 62, the rotating sleeve 62 gradually pulls the traction wire 42 to gradually bend the adjustable bending sheath tube 4, and during the bending process of the adjustable bending sheath tube 4, even if the rotating sleeve 62 stops rotating, the adjustable bending sheath tube 4 can maintain the bending state, which is beneficial for multiple adjustments to the most suitable bending degree of the adjustable bending sheath tube 4 during surgery.

[0067] For further information, see Figure 7 The inner wall of the rotating sleeve 62 is spaced from the outer wall of the adjustable bending sheath tube 4. A fixing block 621 and a pressing block 622 are provided on the inner wall of the rotating sleeve 62. The traction line 42 is connected to the fixing block 621. The pressing block 622 is used to press the traction line 42 onto the fixing block 621.

[0068] Specifically, the fixing block 621 may be a stud, and the pressing block 622 may be a nut. The distal end of the traction line 42 may be connected to the fixing block 621. The pressing block 622 is screwed to the fixing block 621 to further fix the traction line 42 to the fixing block 621.

[0069] In one possible implementation, see Figure 2 The stent delivery device 100 also includes an inner sheath core 3 and a fixing component 1. The fixing component 1 is fixedly sleeved on one end of the inner sheath core 3. The fixing component 1 is used to fix one end of the stent 200. The adjustable bending sheath tube 4 is slidably sleeved on the inner sheath core 3. One end of the adjustable bending sheath tube 4 abuts against the fixing component 1. The other end of the adjustable bending sheath tube 4 is connected to the sheath tube adjustment component 6. A receiving cavity 40 is formed between the adjustable bending sheath tube 4 and the inner sheath core 3. The receiving cavity 40 is used to accommodate the stent 200.

[0070] An accommodating cavity 40 is formed by setting an adjustable bending sheath tube 4 and an inner sheath core 3. Since the accommodating cavity 40 is tubular, the tubular stent 200 can remain tubular and tightened in the accommodating cavity 40. On the one hand, the space in the stent delivery device 100 can be fully utilized. On the other hand, the size of the stent delivery device 100 can be reduced after the stent 200 is tightened during transportation, thereby reducing the interference of the stent delivery device 100 on the blood vessel. Moreover, the stent 200 remains tubular during transportation. When the stent 200 is released, the stent 200 can easily return to its original shape to achieve the treatment of vascular lesions by the stent 200.

[0071] For further information, see Figure 2 One end of the adjustable bending sheath tube 4 is in contact with the fixed component 1. The adjustable bending sheath tube 4 can slide relative to the inner sheath core 3. When the adjustable bending sheath tube 4 is away from the fixed component 1, the part of the bracket 200 exposed from the adjustable bending sheath tube 4 opens under the action of its own tension.

[0072] See also Figure 8 The fixing assembly 1 includes a fixing member 11 and a limiting member 12. One end of the limiting member 12 passes through the bracket 200 and abuts against the fixing member 11 to lock the bracket 200. The limiting member 12 can slide relative to the fixing member 11. When the limiting member 12 moves away from the fixing member 11, the limiting member 12 releases the bracket 200.

[0073] For details, please refer to Figure 2 and Figure 8 , the stent 200 and the stopper 12 both extend along the first direction X. The proximal end of the stent 200 has a hollow portion, and one end of the stopper 12 (the proximal end of the stopper 12) can pass through the hollow portion of the stent 200 and abut against the fixing member 11 to tighten and fix the proximal end of the stent 200. The distal end of the stent 200 is close to the operating end of the stent delivery device 100, and the distal end of the stent 200 is tightened and bound to other positions of the stent delivery device 100. The stent 200 is tightened and bound to the stent delivery device 100, so that the stent delivery device 100 can deliver the stent 200 to the blood vessel.

[0074] In one possible implementation, see Figure 2 and Figure 8 The inner sheath core 3 and the adjustable bending sheath tube 4 are made of a bendable material, which can improve the bending performance of the stent delivery device 100, so that the stent delivery device 100 can transport the stent 200 to a curved blood vessel, thereby increasing the application scenarios of the stent delivery device 100.

[0075] See also Figure 2 and Figure 8The limiting member 12 extends in the accommodating cavity 40 , and a gap between the limiting member 12 and the inner wall of the bendable tube 41 is used for the bracket 200 .

[0076] See also Figure 2 and Figure 8 The number of the limiting members 12 can be multiple. When there are multiple limiting members 12, the multiple limiting members 12 are annularly arranged in the accommodating cavity 40. The distal end of the bracket 200 is sleeved on the periphery of the multiple limiting members 12.

[0077] The limiting member 12 is accommodated between the inner sheath core 3 and the adjustable bending sheath tube 4 , and the limiting member 12 is disposed in the stent 200 , so that the limiting member 12 does not affect the distal release of the stent 200 .

[0078] See also Figure 2 and Figure 8 The material of the limiting member 12 is a bendable material, which further increases the bending performance of the stent delivery device 100, so that the stent delivery device 100 can transport the stent 200 to a curved blood vessel, thereby increasing the application scenarios of the stent delivery device 100.

[0079] Specifically, the limiting members 12 are dispersedly arranged in the accommodating cavity 40. When the stent delivery device 100 penetrates into a curved and extended blood vessel, the limiting members 12 can bend along with the inner sheath core 3 and the adjustable bending sheath tube 4, so that the stent delivery device 100 can deliver the stent 200 to the curved blood vessel.

[0080] See also Figure 2 and Figure 8 The fixing assembly 1 further includes a guide member 13. The guide member 13 is disposed between the fixing member 11 and the sheath adjustment assembly 6. The guide member 13 is close to the fixing member 11. The limiting member 12 penetrates and is slidably connected to the guide member 13. A receiving space 14 is formed between the guide member 13 and the fixing member 11. The receiving space 14 is used to receive the end of the bracket 200. The limiting member 12 penetrates the end of the bracket 200.

[0081] Specifically, one end of the limiting member 12 passes through the guiding member 13 and enters the receiving space 14 , so as to pass through the end of the bracket 200 and abut against the fixing member 11 .

[0082] For details, please refer to Figure 8, the guide member 13 can be connected to the fixing member 11. The fixing member 11 has a first surface 111 facing the guide member 13. The guide member 13 has a second surface 131 facing the fixing member 11. The second surface 131 can be provided with a protrusion 132. The protrusion 132 is connected to the first surface 111. The radial dimension of the protrusion 132 can be smaller than the radial dimension of the first surface 111 and the second surface 131, that is, the protrusion 132 is radially concave relative to the fixing member 11 and the guide member 13. The outer peripheral surfaces of the first surface 111, the second surface 131 and the protrusion 132 form the receiving space 14.

[0083] Furthermore, the guide member 13 may be integrally formed with the fixing member 11 , that is, one end of the protrusion 132 is integrally formed with the guide member 13 , and the other end is integrally formed with the fixing member 11 .

[0084] A fixing member 11 and a guide member 13 are provided in the fixing assembly 1, wherein the fixing member 11 cooperates with the limiting member 12 so that the limiting member 12 locks one end of the bracket 200, and the guide member 13 provides guidance for the limiting member 12 so that the limiting member 12 moves away from or approaches the fixing member 11 along the first direction X. Moreover, in the process of the limiting member 12 moving away from the fixing member 11, one end of the bracket 200 is separated from the limiting member 12 due to the obstruction of the guide member 13, thereby realizing the release of the bracket 200.

[0085] See also Figure 8 The fixing member 11 has a first through hole 112. The guiding member 13 has a second through hole 112. The second through hole 133 is aligned with the first through hole 112. The limiting member 12 passes through the second through hole 112 and is aligned with or penetrates the first through hole 112.

[0086] For details, please refer to Figure 8 , a first through hole 112 is provided on the first surface 111. Specifically, the first through hole 112 may be a blind hole. The first through hole 112 extends along the first direction X. One end of the limiting member 12 penetrates into or exits the first through hole 112 under the drive of an external force. By providing the first through hole 112 on the fixing member 11, the limiting member 12 can pass through the first through hole 112, so that the fixing member 11 limits one end of the limiting member 12, thereby locking the bracket 200, so that the bracket 200 is not easy to detach.

[0087] For details, please refer to Figure 8 The guide member 13 has a second through hole 133. The second through hole 133 can penetrate the guide member 13 along the first direction X. The second through hole 133 is aligned with the first through hole 112. The stopper 12 penetrates the second through hole 133 and is slidably connected to the guide member 13.

[0088] Specifically, the proximal end of the limiting member 12 penetrates into the first through hole 112 through the second through hole 133 , and when the limiting member 12 moves, the limiting member 12 slides along the second through hole 133 .

[0089] By providing the second through hole 133 on the guide member 13 , the second through hole 133 guides the limiting member 12 , and the second through hole 133 is aligned with the first through hole 112 , so that the limiting member 12 can accurately penetrate into the first through hole 112 .

[0090] Specifically, when the limiting member 12 moves away from the fixing member 11 under the action of an external force, the end of the limiting member 12 can be retracted into the second through hole 133, and the bracket 200 is separated from the limiting member 12 under the blocking of the guide member 13. The guide member 13 plays a role in assisting the bracket 200 to separate from the limiting member 12.

[0091] In one possible implementation, see Figure 8 , the number of the first through holes 112 is multiple. The multiple first through holes 112 are arranged in a circular shape. The number and arrangement of the second through holes 133 are the same as the number and arrangement of the first through holes 112. And one first through hole 112 is directly opposite to one second through hole 133. The number of the limiting members 12 is multiple. The multiple limiting members 12 are arranged in a tubular shape. One of the limiting members 12 passes through one of the second through holes 133 and is aligned with or inserted into one of the first through holes 112. For details, please refer to Figure 3 and Figure 7 The stent 200 is tubular. The proximal end of the stent 200 has a plurality of hollow portions, and a plurality of stoppers 12 respectively pass through the plurality of hollow portions and abut against the fixing member 11 , so that the proximal end of the stent 200 is tightened and fixed on the stoppers 12 .

[0092] By providing a plurality of stoppers 12 to fix the stent 200 along the circumferential direction, the proximal end of the stent 200 is tightened and keeps a tubular shape, and the firmness of the stent 200 fixed to the stoppers 12 can also be improved.

[0093] In one possible implementation, see Figure 2 The stent delivery device 100 further includes a sheath tube sliding assembly 5. The sheath tube sliding assembly 5 is disposed between the fixing assembly 1 and the releasing assembly 2. The sheath tube sliding assembly 5 is sleeved on the outer periphery of the adjustable bending sheath tube 4. The sheath tube sliding assembly 5 is used to drive the adjustable bending sheath tube 4 away from the fixing member 11.

[0094] It can be understood that when the stent 200 is disposed in a blood vessel of a subject to be treated, the sheath sliding assembly 5 and the release assembly 2 are disposed outside the subject to be treated, so that the operator can control the opening and release of the stent 200 .

[0095] By operating the sheath tube sliding assembly 5, the adjustable bending sheath tube 4 is controlled to be away from the fixing member 11, which is easy to operate and has strong controllability.

[0096] In one possible implementation, see Fig. 9 The sheath sliding assembly 5 includes a first sleeve 51 and a driving assembly 52 threadedly connected to the first sleeve 51. The first sleeve 51 is sleeved on the periphery of the adjustable bending sheath tube 4 and is slidably connected to the adjustable bending sheath tube 4. The driving assembly 52 is sleeved on the periphery of the adjustable bending sheath tube 4 and is fixedly connected to the adjustable bending sheath tube 4. When the driving assembly 52 rotates relative to the first sleeve 51, the driving assembly 52 gradually moves away from the first sleeve 51, and the adjustable bending sheath tube 4 gradually moves away from the fixing member 11 under the action of the driving assembly 52, so that the proximal end of the bracket 200 is gradually exposed from the adjustable bending sheath tube 4.

[0097] It can be understood that the first sleeve 51 can be a sheath adjustment component 6.

[0098] In one possible implementation, see Fig. 9 The driving assembly 52 includes a locking member 521 and a sliding sleeve 522. One end of the locking member 521 is threadedly connected to the first sleeve 51. The other end of the locking member 521 is engaged with the sliding sleeve 522. The locking member 521 is slidably connected to the adjustable bending sheath tube 4. The sliding sleeve 522 is fixedly connected to the adjustable bending sheath tube 4. When the locking member 521 is separated from the sliding sleeve 522, the sliding sleeve 522 can drive the adjustable bending sheath tube 4 to gradually move away from the fixing member 11.

[0099] By setting a locking piece 521 and a sliding sleeve 522, the locking piece 521 is threadedly connected to the first sleeve 51, and the locking piece 521 is rotated relative to the first sleeve 51, so that the adjustable bending sheath tube 4 can slowly retreat a small stroke, and the proximal end of the bracket 200 gradually opens; the locking piece 521 and the sliding sleeve 522 are engaged with each other, and when the locking piece 521 is separated from the sliding sleeve 522, the sliding sleeve 522 is no longer constrained by the locking piece 521 and can pull the adjustable bending sheath tube 4 back a large distance, so that the adjustable bending sheath tube 4 can quickly retreat a large stroke, so that the proximal and distal ends of the bracket 200 can open.

[0100] For further information, see Fig. 9The locking member 521 includes a second sleeve 523 and a switch 524 disposed on the second sleeve 523. The second sleeve 523 is sleeved on the outer tube and slides relative to the outer tube. The switch 524 is connected to the second sleeve 523 by sliding along the radial direction of the second sleeve 523. The buckle 528 of the switch 524 is engaged with the sliding sleeve 522. When the switch 524 slides to the pressed position, the buckle 528 of the switch 524 is separated from the sliding sleeve 522.

[0101] For further information, see Fig.10 The switch 524 includes a pressing portion 525, an elastic member 526 and a base 527 which are sequentially arranged along the radial direction of the second sleeve 523. The pressing portion 525 is disposed on the outer peripheral surface of the second sleeve 523. The elastic member 526 elastically abuts between the pressing portion 525 and the base 527, so that a distance 529 is provided between the pressing portion 525 and the base 527. The buckling portion 528 extends from one end of the pressing portion 525 toward the sliding sleeve 522. When the pressing portion 525 abuts against the base 527, the switch 524 is located at the pressed position. When the sliding sleeve 522 abuts against the second sleeve 523 and the switch 524 rebounds from the pressed position under the action of the elastic member 526, the buckling portion 528 of the switch 524 is engaged with the sliding sleeve 522 under the action of the pressing portion 525.

[0102] In one possible implementation, see Figure 2 The stent delivery device 100 further includes a release assembly 2. The release assembly 2 is located on a side of the sheath adjustment assembly 6 away from the fixing assembly 1. The release assembly 2 is connected to the other end of the stopper 12. The release assembly 2 is used to drive the stopper 12 away from or close to the fixing assembly 11.

[0103] For details, please refer to Fig.11 The release assembly 2 includes a movable member 21 and a locking member 22 connected to the movable member. The movable member 21 is connected to the other end of the limiting member 12 (the distal end of the limiting member 12). The locking member 22 is slidably connected to the movable member 21. When the locking member 22 is located at the first position, the movable member 21 is fixed relative to the fixing member 11 under the restriction of the locking member 22. When the locking member 22 slides to the second position, the movable member 21 can drive the limiting member 12 away from the fixing member 11 to release the bracket 200.

[0104] See also Fig.11The movable member 21 is used to drive the limiting member 12 away from the fixing member 11 along the first direction X, so that the limiting member 12 releases the stent 200. The locking member 22 is used to lock the movable member 21 to prevent the movable member 21 from moving along the first direction X, thereby preventing the limiting member 12 from releasing the stent 200 due to accidental touch when the stent 200 does not need to be released, resulting in an incorrect release position of the stent 200 and failure to treat vascular diseases.

[0105] For details, please refer to Fig.11 , the locking piece 22 is slidably connected to the movable piece 21. When the locking piece 22 is located at the first position, the movable piece 21 is fixed relative to the fixed piece 11 under the restriction of the locking piece 22. In other words, when the locking piece 22 is located at the first position, the movable piece 21 is locked so that the movable piece 21 cannot move along the first direction X. When the locking piece 22 slides to the second position, the movable piece 21 can drive the limiting piece 12 away from the fixed piece 11 to release the stent 200. In other words, when the locking piece 22 is located at the second position, the movable piece 21 can move along the first direction X, and when the movable piece 21 drives the limiting piece 12 away from the fixed piece 11, the limiting piece 12 can be separated from the proximal end of the stent 200 when it moves to a certain position, thereby releasing the stent 200 into the blood vessel.

[0106] By setting a locking piece 22 to lock the movable part 21, it is prevented that the movable part 21 drives the limiting piece 12 to release the bracket 200 when there is no need to release the bracket 200. The locking piece 22 locks the movable part 21 or releases the movable part 21 by moving to different positions, thereby controlling the movable part 21 to drive the limiting piece 12 to release the bracket 200 at an appropriate time, that is, by controlling the position change of the locking piece 22, the time and position of the bracket 200 are controlled. Since the locking piece 22 has a position change, it is easy to quickly judge whether the limiting piece 12 is in a state of locking the movable part 21 or a state of releasing the movable part 21, so that the next step of operation on the locking piece can be quickly performed, saving surgical treatment time.

[0107] In one possible implementation, see Fig.12 A first slide groove 211 and a second slide groove 212 are provided on the outer circumferential surface of the movable member 21. The first slide groove 211 extends along the circumference of the movable member 21. The second slide groove 212 extends along the direction of the central axis L, and one end of the locking member 22 can slide along the first slide groove 211 and the second slide groove 212.

[0108] Specifically, the movable member 21 may be cylindrical, wherein the axial direction of the movable member 21 is the first direction X. Of course, in other embodiments, the movable member 21 may also be in other cylindrical shapes such as a square cylinder.

[0109] The first slide groove 211 and the second slide groove 212 are provided on the outer circumferential surface of the movable member 21. The first slide groove 211 extends along the circumferential direction of the movable member 21, and the second slide groove 212 extends along the first direction X. When the locking member 22 is located in the first slide groove 211, the locking member 22 locks the movable member 21 in the first direction X to limit the movable member 21 from moving along the first direction X. At this time, the limiting member 12 abuts against the fixing member 11. When the limiting member 12 passes through the bracket 200, the limiting member 12 fixes the bracket 200 on the bracket delivery device 100. When the locking member 22 slides to the second sliding groove 212, the locking member 22 releases the movable member 21 so that the movable member 21 can move along the first direction X, and then the movable member 21 can drive the limiting member 12 away from the fixing member 11 along the first direction X to release the bracket 200 on the limiting member 12, or the movable member 21 can drive the limiting member 12 along the first direction X to approach the fixing member 11 to return the limiting member 12 to the initial position after releasing the bracket 200.

[0110] Further, the first position and the second position are located in the first slide groove 211 and the second slide groove 212, respectively. Specifically, the first position can be any position in the first slide groove 211, and the second position can be any position in the second slide groove 212. That is, when the locking member 22 is located in the first slide groove 211, the movable member 21 is fixed relative to the fixed member 11 under the restriction of the locking member 22. When the locking member 22 slides to the second slide groove 212, the movable member 21 can drive the limiting member 12 away from the fixed member 11 to release the bracket 200.

[0111] For further information, see Fig.12 The movable member 21 has a first end surface 213. The second slide groove 212 passes through the first end surface 213. When the movable member 21 is away from the fixed member 11, the locking member 22 can slide out through the second slide groove 212 until it is separated from the movable member 21. It can be understood that the first end surface 213 is close to the fixed member 11.

[0112] By setting the second slide groove 212 to penetrate the first end surface 213, the locking member 22 can slide out of the second slide groove 212, and the movable member 21 is separated from the locking member 22. By controlling the movable member 21 to pull the limiting member 12 along the first direction X, the limiting member 12 can be quickly separated from the fixing member 11, so as to quickly release the bracket 200, so that the bracket 200 is released at an accurate position and the operation time is reduced. Moreover, the movable member 21 separated from the locking member 22 can flexibly move a suitable process to drive the limiting member 12 to move a suitable distance, so that the limiting member 12 can release the bracket 200 without being too far away from the fixing member 11, which makes it difficult to return to the initial position.

[0113] See also Fig.12 The release assembly 22 further includes a third sleeve 23. The third sleeve 23 is sleeved on the periphery of the movable member 21. The third sleeve 23 has a limiting hole 231. The locking member 22 is disposed on the third sleeve 23. The locking member 22 is slidably connected to the movable member 21 through the limiting hole 231.

[0114] It can be understood that the central axis L of the third sleeve 23 is along the first direction X. The third sleeve 23 can constrain the locking member 22 in the radial direction, so that the locking member 22 can be slidably connected to the movable member 21 .

[0115] In a possible embodiment, the limiting hole 231 is a long strip hole. Specifically, the limiting hole 231 can extend along the circumferential direction of the third sleeve 23. When the locking member 22 slides, the third sleeve 23 is fixed relative to the fixing member 11, and the locking member 22 can slide in the limiting hole 231. In other embodiments, the locking member 22 can be fixed on the third sleeve 23. When the locking member 22 slides, the locking member 22 and the third sleeve 23 rotate together around the first direction X, so that one end of the locking member 22 is slidably connected to the movable member 21.

[0116] For further information, see Fig.12 The limiting hole 231 extends along the circumference of the first sleeve 23. The locking member 22 can slide along the limiting hole 231 from one end of the first slide groove 211 to the other end of the first slide groove 211, and the inner wall of the limiting hole 231 limits the locking member 22 to be fixed relative to the first sleeve 23 in the axial direction.

[0117] By setting the limiting hole 231 as a strip hole extending along the circumferential direction, the limiting hole 231 provides a sliding space for the locking piece 22, so that the locking piece 22 can slide along the circumferential direction of the first sleeve 23 and limit the axial fixation of the locking piece 22 relative to the first sleeve 23, so that the position of the locking piece 22 can be changed, which is convenient for quickly identifying whether the movable part 21 is in the locked state and the released state, thereby increasing the release speed of the bracket 200.

[0118] Furthermore, when the locking piece 22 slides out along the second slide groove 212, the movable piece 21 is separated from the third sleeve 23 and the locking piece 22, and the limiting piece 12 is driven by the movable piece 21 away from the fixing piece 11, thereby releasing the stent 200, thereby achieving the treatment of vascular diseases.

[0119] In one possible implementation, see Fig.12The movable member 21 includes a connecting portion 215 and an operating portion 216 connected to each other. The connecting portion 215 is provided with the first slide groove 211 and the second slide groove 212. The third sleeve 23 is sleeved on the outer peripheral surface of the connecting portion 215. The connecting portion 215 is connected to the limiting member 12. The operating portion 216 is provided outside the third sleeve 23, and the operating portion 216 is used to move under the action of an external force, and drive the connecting portion 215 and the limiting member 12 away from or close to the fixed member 11.

[0120] For details, please refer to Fig.12 The operating part 216 may be a structure for hand-holding. When the locking member 22 releases the movable member 21, the operator holds the operating part 216 and pulls the operating part 216 toward the distal end of the stent delivery device 100, and the operating part 216 drives the connecting part 215 to approach the distal end of the stent delivery device 100. The limiting member 12 is moved close to the distal end of the stent delivery device 100 under the action of the connecting part 215, so that the limiting member 12 gradually moves away from the fixing member 11, thereby quickly releasing the stent 200 at the vascular lesion.

[0121] In one possible implementation, see Fig.12 The locking member 22 includes a toggle portion 221 and a sliding portion 222 connected to each other. The toggle portion 221 abuts against the outer circumference of the third sleeve 23. The sliding portion 222 passes through the limiting hole 231 and abuts against the inner circumference of the third sleeve 23. The toggle portion 221 is used to slide relative to the third sleeve 23 under the action of an external force, so as to drive the sliding portion 222 to slide along the limiting hole 231 of the third sleeve 23.

[0122] The operator can slide the sliding part 222 along the limiting hole 231 by sliding the toggle part 221. That is, the operator can operate the toggle part 221 to make the locking piece 22 lock the movable part 21 and release the movable part 21. The operation is simple and convenient, highly feasible, and fast to improve the efficiency of releasing the bracket 200.

[0123] Furthermore, the toggle portion 221 and the sliding portion 222 are detachably connected, so that the locking member 22 can be conveniently and quickly installed on the third sleeve 23 .

[0124] In one possible implementation, see Fig.12, the toggle part 221 is engaged with the sliding part 222. The toggle part 221 includes a cover plate 223 and a hook 224 provided on the cover plate 223. The cover plate 223 abuts against the outer surface of the third sleeve 23. The sliding part 222 has a through hole 227 connecting the first sliding part 225 and the second sliding part 226 and penetrating the first sliding part 225 and the second sliding part 226. The first sliding part 225 is slidably connected to the limiting hole 231 of the third sleeve 23. The second sliding part 226 is slidably connected to the first sliding groove 211 and the second sliding groove 212 of the movable part 21. The hook 224 is engaged with the second sliding part 226 through the through hole 227, so that one end of the first sliding part 225 abuts against the cover plate 223.

[0125] In other embodiments, the shifting portion 221 and the sliding portion 222 may be threadedly connected or magnetically connected.

[0126] For further information, see Fig.12 The outer surface of the cover plate 223 is provided with a convex pattern 228, so that when the operator manually moves the cover plate 223, the convex pattern 228 plays an anti-slip role.

[0127] In conjunction with any of the above implementations, please refer to Figure 1 and Figure 2 The sheath adjustment assembly 6 , the sheath sliding assembly 5 and the release assembly 2 form a handle portion of the stent delivery device 100 .

[0128] The operation process of the stent delivery device 100 of the present invention is as follows:

[0129] During the operation, the blood vessel of the subject to be treated is punctured first, a guide wire is inserted, and then the stent delivery device 100 is delivered into the aorta along the guide wire. Under X-ray fluoroscopy, the stent delivery device 100 is moved to the vicinity of the lesion; the rotating sleeve 62 is rotated, and the rotating sleeve 62 drives the traction wire 42 to move, so that the flexible tube 41 is bent. By adjusting the number of rotations of the rotating sleeve 62, the flexible tube 41 is adjusted to a suitable angle, and then the flexible tube 41 is moved into the curved blood vessel; the locking member 521 is rotated, and the adjustable bending sheath 4 slowly retreats, so that the proximal end of the stent 200 slowly opens. When the stent 200 is released to a certain position, since the proximal end of the stent 200 is still restrained by the limit member 12, At this time, the stent 200 has not been fully opened. By moving the direct delivery device, the stent 200 is moved to the most suitable release position; the switch 524 on the locking member 521 is pressed and the sliding sleeve 522 is pulled back at the same time, and the main body of the stent 200 is opened; the locking member 22 is moved to the second sliding groove 212, and the movable member 21 is pulled back to make the limiting member 12 away from the fixing member 11, thereby releasing the proximal end of the stent 200, and the stent 200 is completely separated from the stent delivery device 100, completing the release process, and finally the stent delivery device 100 is withdrawn from the treated body along the guide wire.

[0130] The above are some embodiments of the present invention. It should be pointed out that a person skilled in the art can make several improvements and modifications without departing from the principles of the present invention. These improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. An adjustable bending sheath tube for delivering a stent into a blood vessel, characterized in that: include: A bendable tube body, wherein a fixing portion, a first opening, a second opening and a third opening are provided on an outer tube wall of the bendable tube body, wherein the first opening is located between the second opening and the fixing portion, and the second opening is located between the first opening and the third opening; and A traction wire, one end of which is fixedly connected to a fixed portion of the flexible tube body, one end of which is tied to the fixed portion, or one end of which is welded, bonded, snap-connected, or integrally formed with the fixed portion; the other end of the traction wire penetrates into the flexible tube body through the first opening and passes out of the outer tube wall of the flexible tube body through the second opening, and penetrates into the flexible tube body through the third opening until it passes out of the other end of the flexible tube body. When the other end of the traction wire is pulled, one end of the traction wire drives one end of the flexible tube body to approach the other end of the traction wire, and the traction wire exposed outside the flexible tube body is shortened, driving the flexible tube body between the fixed portion and the first opening and the flexible tube body between the second opening and the third opening to bend, so that the flexible tube body bends, and the traction wire can extend along the bending arc of the flexible tube body.

2. The adjustable bending sheath tube according to claim 1, characterized in that: The first opening and the second opening are arranged along the axial direction of the bendable tube.

3. The adjustable bending sheath tube according to claim 2, characterized in that: The first opening, the second opening and the third opening are collinear along an axial direction of the bendable tube.

4. The adjustable bending sheath tube according to claim 3, characterized in that: A fourth opening is also provided on the outer tube wall of the bendable tube body, and the fourth opening is close to the other end of the bendable tube body. The other end of the traction line passes through the fourth opening and out of the bendable tube body.

5. The adjustable bending sheath tube according to claim 3, characterized in that: The end surface of the other end of the bendable tube body has a fourth opening, and the other end of the traction line passes through the fourth opening and out of the bendable tube body.

6. The adjustable bending sheath tube according to claim 4, characterized in that: The bendable tube body comprises an inner lining layer and an outer lining layer sleeved on the outer periphery of the inner lining layer, the outer lining layer and the inner lining layer are spaced apart to form an inner cavity, the first opening, the second opening, the third opening and the fourth opening are connected to the inner cavity, and the traction line portion is arranged in the inner cavity.

7. The adjustable bending sheath tube according to claim 1, characterized in that: A fixing portion is provided in the bendable tube body, one end of the traction wire is fixed to the fixing portion, a first through hole and a second through hole are provided on the outer tube wall of the bendable tube body, the first through hole is provided between the second through hole and the fixing portion, the traction wire passes through the bendable tube body through the first through hole, and passes through the bendable tube body through the second through hole.

8. The adjustable bending sheath tube according to claim 7, characterized in that: A third through hole, a fourth through hole and a fifth through hole are also provided on the outer tube wall of the flexible tube body. The first through hole, the second through hole, the third through hole, the fourth through hole and the fifth through hole are collinear along the axial direction of the flexible tube body. The traction line passes through the third through hole and out of the flexible tube body, and passes through the fourth through hole and into the flexible tube body until passing through the fifth through hole and out of the flexible tube body.

9. The adjustable bending sheath tube according to any one of claims 1 to 8, characterized in that: The bendable tube body has an opening, and the traction line passes through the opening to pass out of or into the bendable tube body. The adjustable bending sheath tube also includes an elastic seal, which is coated on the outer peripheral wall of the traction line. The elastic seal is arranged in the bendable tube body and seals the opening.

10. The adjustable bending sheath tube according to any one of claims 1 to 8, characterized in that: The bendable tube body has an opening and a reinforcement layer arranged in the opening. The traction line passes through the opening to pass out of or into the bendable tube body. The reinforcement layer surrounds the outer peripheral wall of the traction line. The reinforcement layer is used to increase the strength of the opening of the bendable tube body.

11. A stent delivery device for releasing a stent into a blood vessel, characterized in that: It comprises the adjustable bending sheath tube as described in any one of claims 1 to 10, and also comprises a sheath tube adjustment component, wherein the sheath tube adjustment component is connected to the other end of the traction line, and the sheath tube adjustment component is used to pull the traction line.

12. The stent delivery device according to claim 11, wherein: The sheath adjustment assembly includes a fixed sleeve and a rotating sleeve, the fixed sleeve is fixedly mounted on the periphery of the adjustable bending sheath tube, the rotating sleeve is slidably mounted on the periphery of the adjustable bending sheath tube, and the fixed sleeve is threadedly connected to the rotating sleeve, the rotating sleeve is connected to the other end of the traction line, when the rotating sleeve is rotated, the rotating sleeve moves away from the fixed sleeve, and the rotating sleeve pulls the traction line to make the adjustable bending sheath tube bend.

13. The stent delivery device according to claim 12, wherein: The inner wall of the rotating sleeve is spaced from the outer wall of the adjustable bending sheath tube, and a fixing block and a clamping block are provided on the inner wall of the rotating sleeve. The traction line is connected to the fixing block, and the clamping block is used to clamp the traction line onto the fixing block.

14. The stent delivery device according to claim 12, wherein: The stent delivery device also includes an inner sheath core and a fixing component, wherein the fixing component is fixedly sleeved on one end of the inner sheath core, and the fixing component is used to fix one end of the stent, the adjustable bend sheath tube is slidably sleeved on the inner sheath core, and one end of the adjustable bend sheath tube abuts the fixing component, and the other end of the adjustable bend sheath tube is connected to the sheath tube adjustment component, and a accommodating cavity is formed between the adjustable bend sheath tube and the inner sheath core, and the accommodating cavity is used to accommodate the stent.

15. The stent delivery device according to claim 14, wherein: The fixing assembly includes a fixing member and a limiting member, one end of the limiting member passes through the bracket and abuts against the fixing member to lock the bracket, and the limiting member is slidably connected to the fixing member. When the limiting member is away from the fixing member, the limiting member releases the bracket.

16. The stent delivery device according to claim 15, wherein: The limiting member extends in the accommodating cavity, and a gap between the limiting member and the inner wall of the bendable tube body is used for the bracket.

17. The stent delivery device according to claim 15, wherein: The material of the limiting member is a bendable material.

18. The stent delivery device according to claim 16, wherein: The fixing assembly also includes a guide member, which is arranged between the fixing member and the sheath adjustment assembly. The limit member passes through and is slidably connected to the guide member. A receiving space is formed between the guide member and the fixing member. The receiving space is used to receive the end of the bracket. The limit member passes through the end of the bracket.

19. The stent delivery device according to claim 18, wherein: The fixing member has a first through hole, the guiding member has a second through hole, the second through hole is aligned with the first through hole, and the limiting member passes through the second through hole and is aligned with or extends into the first through hole.

20. The stent delivery device according to claim 19, wherein: There are multiple limit members, there are multiple first vias, the multiple first vias are arranged in a circle, and the number and arrangement of the second vias are the same as the number and arrangement of the first vias.

21. The stent delivery device according to claim 15, wherein: The stent delivery device also includes a sheath sliding assembly, which is fixedly mounted on the adjustable sheath and connected to the sheath adjustment assembly. The sheath sliding assembly is used to drive the adjustable sheath to slide relative to the inner sheath core so that the stent is exposed from the adjustable sheath.

22. The stent delivery device according to claim 21, wherein: The sheath tube sliding assembly includes a first sleeve and a driving assembly threadedly connected to the first sleeve. The first sleeve is slidably sleeved on the periphery of the adjustable bending sheath tube, and the driving assembly is fixedly sleeved on the periphery of the adjustable bending sheath tube. When the driving assembly rotates relative to the first sleeve, the driving assembly gradually moves away from the first sleeve, and the adjustable bending sheath tube gradually moves away from the fixed assembly under the action of the driving assembly.

23. The stent delivery device according to claim 22, wherein: The driving assembly includes a locking piece and a sliding sleeve, one end of the locking piece is threadedly connected to the first sleeve, and the other end of the locking piece is detachably connected to the sliding sleeve, the locking piece is slidably connected to the adjustable bending sheath tube, and the sliding sleeve is fixedly connected to the adjustable bending sheath tube. When the locking piece is separated from the sliding sleeve, the sliding sleeve can drive the adjustable bending sheath tube to gradually move away from the fixed assembly.

24. The stent delivery device according to claim 21, wherein: The stent delivery device also includes a release component. The sheath adjustment component is located between the release component and the fixing component. The release component is connected to the other end of the limiting member. The release component is used to drive the limiting member away from or close to the fixing member.

25. The stent delivery device according to claim 24, wherein: The release assembly includes a movable part and a locking part connected to the movable part, the movable part is connected to the other end of the limiting part, and the locking part is slidably connected to the movable part. When the locking part is located at a first position, the movable part is fixed relative to the fixing part under the restriction of the locking part; when the locking part slides to a second position, the movable part can drive the limiting part away from the fixing part to release the bracket.

26. The stent delivery device according to claim 25, wherein: A first slide groove and a second slide groove connected end to end are provided on the outer circumferential surface of the movable part, the first slide groove extends along the circumference of the movable part, and the second slide groove extends along the axial direction of the adjustable bending sheath tube. One end of the locking piece can slide along the first slide groove and the second slide groove, and the first position and the second position are respectively located in the first slide groove and the second slide groove.

27. The stent delivery device according to claim 26, wherein: The movable member has a first end surface, and the second sliding groove passes through the first end surface. When the movable member is away from the fixed member, the locking member can slide out through the second sliding groove until it is separated from the movable member.

28. The stent delivery device according to claim 27, wherein: The release assembly also includes a first sleeve, which is sleeved on the periphery of the movable part. The first sleeve has a limiting hole, which extends along the circumference of the first sleeve. The locking piece is arranged on the first sleeve, and the locking piece can slide along the limiting hole from one end of the first slide groove to the other end of the first slide groove. The inner wall of the limiting hole limits the locking piece to be fixed relative to the first sleeve in the axial direction.

29. The stent delivery device according to claim 24, wherein: The sheath adjustment assembly, the sheath sliding assembly and the release assembly form a handle portion of the stent delivery device.

Images