Adaptive stent delivery device

Abstract

The present invention relates to an adaptive stent delivery device, comprising: a microcatheter, comprising a catheter lumen; a push guide wire, one end of which is movably arranged in the catheter lumen, and the other end of which is located to penetrate the catheter lumen to the outside; a first pad group, comprising a first friction pad and a second friction pad, one end of the first friction pad and the second friction pad are both arranged on the push guide wire; the other end of the first friction pad and the other end of the second friction pad are arranged in a direction away from each other, and an angle is formed between the two; the first friction pad and the second friction pad are respectively arranged on both sides of the push guide wire along its length direction; the first friction pad is longer than the second friction pad, and the first friction pad is thicker than the second friction pad; wherein the first pad group can move toward the distal end or the proximal end with the push guide wire. The tension formed between the first friction pad and the second friction pad is used to support the stent outward and adapt to a variety of microcatheters with different inner diameters.

Description

Technical Field

[0001] The present invention relates to the technical field of stent delivery devices, and in particular to an adaptive stent delivery device. Background Art

[0002] Intracranial arterial atherosclerotic stenosis is one of the most common causes of stroke, and intravascular stent implantation is one of the main treatments for intracranial arterial stenosis. Currently, during the delivery of the stent, the block on the guide wire and the microcatheter are usually used to clamp the stent, and the friction force is used to move the stent to the distal end for release, or to move the stent to the proximal end for recovery.

[0003] The outer diameter of the block on the existing push guide wire is fixed, and the hardness of the block cannot be adjusted. The inner diameter of the microcatheter that cooperates with the push guide wire to transport the stent is also fixed. During the delivery of the stent, the friction between the push guide wire, the stent and the microcatheter is fixed. If the friction is too large, the stent cannot be delivered; if the friction is too small, the stent is prone to unloading. Summary of the invention

[0004] The present invention provides an adaptive stent delivery device to solve the technical problem that a push block on an existing push guide wire cannot adapt to microcatheters with various inner diameters.

[0005] The present invention discloses an adaptive stent delivery device, which comprises a microcatheter, a push guide wire and a first pad group, wherein the microcatheter comprises a catheter cavity; one end of the push guide wire is movably arranged in the catheter cavity, and the other end of the push guide wire is located to penetrate the catheter cavity to the outside; the first pad group comprises a first friction pad and a second friction pad, one end of the first friction pad and the second friction pad are both arranged on the push guide wire; the other end of the first friction pad and the other end of the second friction pad are arranged in a direction away from each other, and an angle is formed between the two; the first friction pad and the second friction pad are respectively arranged on both sides of the push guide wire along the length direction thereof; the first friction pad is longer than the second friction pad, and the first friction pad is thicker than the second friction pad;

[0006] Among them, the first pad group can move toward the distal end or the proximal end along with the push guide wire; when the first friction pad and the second friction pad are arranged in a cylindrical shape, the outer diameter of the first pad group is 0.4mm~0.5mm; the circumference of one end of the cylindrical first pad group is the first length, the first friction pad and the second friction pad are both arc-shaped sheets, the arc length of the other end of the first friction pad is 1 / 2~3 / 4 of the first length, and the arc length of the other end of the second friction pad is 1 / 4~1 / 2 of the first length.

[0007] Furthermore, the thickness of the first friction pad is 0.2 mm to 0.4 mm.

[0008] Furthermore, the thickness of the second friction pad is 0.1 mm to 0.3 mm.

[0009] Furthermore, the adaptive stent delivery device also includes a second pad group, which is arranged on the push guide wire and is located at an end of the first pad group close to the proximal end.

[0010] Further, the second pad group includes a third friction pad and a fourth friction pad, one end of the third friction pad and the fourth friction pad are both arranged on the push guide wire; the other end of the third friction pad and the other end of the fourth friction pad are arranged in a direction away from each other, and an angle is formed between the two; the third friction pad and the fourth friction pad are respectively arranged on both sides of the push guide wire along its length direction; the third friction pad is longer than the fourth friction pad, and the third friction pad is thicker than the fourth friction pad;

[0011] Among them, the second pad group can move toward the distal end or proximal end with the push guide wire; when the third friction pad and the fourth friction pad are arranged in a cylindrical shape, the outer diameter of the second pad group is 0.55mm~0.6mm; the circumference of one end of the cylindrical second pad group is the second length, the third friction pad and the fourth friction pad are both arc-shaped sheets, the arc length of the other end of the third friction pad is 1 / 2~3 / 4 of the second length, and the arc length of the other end of the fourth friction pad is 1 / 4~1 / 2 of the second length.

[0012] Furthermore, the distance between the first pad group and the second pad group is 3 mm to 10 mm.

[0013] Furthermore, the adaptive stent delivery device also includes an auxiliary component arranged on the push guide wire, and the auxiliary component is located between the first friction pad and the second friction pad; the auxiliary component includes a first spring and a sliding block, and the first spring is sleeved on the push guide wire; one end of the first spring is fixedly connected to the push guide wire; the sliding block is sleeved on the push guide wire and is located in the middle position of the first friction pad or the second friction pad; the sliding block is fixedly connected to the other end of the first spring.

[0014] Furthermore, the adaptive stent delivery device also includes an auxiliary component arranged on the push guide wire, and the auxiliary component is located between the third friction pad and the fourth friction pad; the auxiliary component includes a first spring and a sliding block, and the first spring is sleeved on the push guide wire; one end of the first spring is fixedly connected to the push guide wire; the sliding block is sleeved on the push guide wire and is located in the middle position of the third friction pad or the fourth friction pad; the sliding block is fixedly connected to the other end of the first spring.

[0015] Furthermore, the adaptive stent delivery device also includes a recovery pad, one end of which is arranged on the push guide wire, and the other end of the recovery pad is arranged toward the distal end; the recovery pad is located at one end of the first pad group close to the distal end.

[0016] Furthermore, when the recovery pad is arranged in a cylindrical shape, the outer diameter of the recovery pad is 0.55 mm to 0.6 mm.

[0017] The adaptive stent delivery device provided by the present invention can achieve the following technical effects:

[0018] Compared with the prior art, the adaptive stent delivery system of this embodiment arranges a first friction pad and a second friction pad on the push guide wire, and the other end of the first friction pad and the other end of the second friction pad are arranged in a direction away from each other, and the stent is supported outward by the tension formed between the first friction pad and the second friction pad. The tension between the first friction pad and the second friction pad is further optimized by the length difference and thickness difference between the two, and the stent is clamped by cooperating with the microcatheter. While ensuring that the first pad group and the microcatheter have sufficient clamping force for the stent, a variety of microcatheters with different inner diameters can be adapted without replacing the push guide wire and the first pad group, which not only facilitates the transportation of the stent, but also prevents the stent from being unloaded.

[0019] The foregoing general description and the following description are exemplary and explanatory only and are not intended to limit the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] One or more embodiments are exemplarily described by corresponding drawings, and these exemplary descriptions and drawings do not limit the embodiments. Elements with the same reference numerals in the drawings are regarded as similar elements, and wherein:

[0021] Figure 1 Schematic diagram of an embodiment of an adaptive stent delivery device of the present invention Figure 1 ;

[0022] Figure 2 is a schematic diagram of an embodiment of an adaptive stent delivery device of the present invention, in which the first pad group is in a cylindrical state;

[0023] Figure 3 It is a schematic diagram of an embodiment of a first friction pad and a second friction pad of an adaptive stent delivery device of the present invention;

[0024] Figure 4 is a cross-sectional schematic diagram of an embodiment of an adaptive stent delivery device of the present invention, in which the first pad group is in a cylindrical state;

[0025] Figure 5 Schematic diagram of an embodiment of an adaptive stent delivery device of the present invention Figure 2 ;

[0026] Figure 6 Schematic diagram of an embodiment of an adaptive stent delivery device of the present invention Figure 3 ;

[0027] Figure 7 It is a schematic diagram of an embodiment of an adaptive stent delivery device of the present invention, in which the first pad group and the second pad group are both in a cylindrical state;

[0028] Figure 8 It is a schematic diagram of an embodiment of a third friction pad and a fourth friction pad of an adaptive stent delivery device of the present invention;

[0029] Fig. 9 is a cross-sectional schematic diagram of an embodiment of an adaptive stent delivery device of the present invention, in which the second pad group is in a cylindrical state;

[0030] Fig.10 Schematic diagram of an embodiment of an adaptive stent delivery device of the present invention Figure 4 ;

[0031] Fig.11 Schematic diagram of an embodiment of an adaptive stent delivery device of the present invention Figure 5 ;

[0032] Fig.12 Schematic diagram of an embodiment of an adaptive stent delivery device of the present invention Figure 6 ;

[0033] Fig.13 It is a schematic diagram of an embodiment of a first friction pad, a third friction pad, and a recovery pad of an adaptive stent delivery device of the present invention.

[0034] Reference numerals:

[0035] 1. Microcatheter; 11. Catheter cavity; 2. Push guide wire; 21. Guide spring; 22. Fixing ring; 3. First pad group; 31. First friction pad; 32. Second friction pad; 4. Second pad group; 41. Third friction pad; 42. Fourth friction pad; 5. Auxiliary component; 51. First spring; 52. Sliding block; 61. Recovery pad; 62. Notch. DETAILED DESCRIPTION

[0036] In order to be able to understand the features and technical contents of the embodiments of the present invention in more detail, the implementation of the embodiments of the present invention is described in detail below in conjunction with the accompanying drawings. The attached drawings are for reference only and are not used to limit the embodiments of the present invention. In the following technical description, for the convenience of explanation, a full understanding of the disclosed embodiments is provided through multiple details. However, one or more embodiments can still be implemented without these details. In other cases, to simplify the drawings, well-known structures and devices can be simplified for display.

[0037] The terms "first", "second", etc. in the description and claims of the embodiments of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the terms used in this way can be interchanged where appropriate, so that the embodiments of the embodiments of the present invention described here. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions.

[0038] In the embodiments of the present invention, the terms "upper", "lower", "inside", "middle", "outside", "front", "back" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. These terms are mainly used to better describe the embodiments of the present invention and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific direction, or to be constructed and operated in a specific direction. Moreover, in addition to being used to indicate directions or positional relationships, some of the above terms may also be used to indicate other meanings. For example, the term "upper" may also be used to indicate a certain dependency or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in the embodiments of the present invention can be understood according to the specific circumstances.

[0039] In addition, the terms "disposed", "connected", and "fixed" should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0040] Unless otherwise specified, the term "plurality" means two or more and "plurality" means two or more.

[0041] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present invention may be combined with each other.

[0042] In the present invention, the distal end refers to the end away from the operator during surgery, and the proximal end refers to the end close to the operator during surgery.

[0043] First embodiment

[0044] The adaptive stent delivery device mentioned in this embodiment, such as Figure 1 , Figure 2As shown, the adaptive stent delivery device includes a microcatheter 1, a push guidewire 2 and a first pad group 3. The microcatheter 1 has a catheter cavity 11, and the catheter cavity 11 of the microcatheter 1 can allow the push guidewire 2 to pass through. One end of the push guidewire 2 can enter the catheter cavity 11 of the microcatheter 1, and the other end of the push guidewire 2 passes through the catheter cavity 11 of the microcatheter 1 to the outside world. By driving the end of the push guidewire 2 located in the outside world, the end of the push guidewire 2 located in the catheter cavity 11 of the microcatheter 1 can move toward the distal end or the proximal end. The first pad group 3 is arranged on the push guidewire 2, and the first pad group 3 is located at the end close to the distal end. Among them, the first pad group 3 can move toward the distal end or the proximal end with the push guidewire 2.

[0045] like Figure 1 , Figure 2 As shown, the first pad group 3 includes a first friction pad 31 and a second friction pad 32. A fixing ring 22 is provided on the push guide wire 2, and one end of the first friction pad 31 and one end of the second friction pad 32 are fixed to the push guide wire 2 through the fixing ring 22, and the other end of the first friction pad 31 and the other end of the second friction pad 32 are both arranged toward the proximal end, and the other end of the first friction pad 31 and the other end of the second friction pad 32 are arranged in a direction away from each other, and an angle is formed between the first friction pad 31 and the second friction pad 32.

[0046] In this embodiment, if Figures 1 to 4 As shown, the first friction pad 31 and the second friction pad 32 are respectively arranged on both sides of the push guide wire 2 along its length direction. Such an arrangement makes it easy for the first friction pad 31 and the second friction pad 32 to be arranged into a cylindrical structure with the push guide wire 2 as the center. The first friction pad 31 and the second friction pad 32 are both arc-shaped sheets. When they are arranged into a cylindrical structure, the first friction pad 31 is in contact with both sides of the second friction pad 32 along its length direction, or the first friction pad 31 covers both sides of the second friction pad 32, or the second friction pad 32 covers both sides of the first friction pad 31. In order to facilitate the introduction of the arc length of the other end of the first friction pad 31 and the arc length of the other end of the second friction pad 32, the first friction pad 31 and the second friction pad 32 are arranged as shown in the figure. Figure 4In the state of the cylindrical structure shown, the first pad group 3 is introduced. In the state of the cylindrical structure, the cross-sectional shape of one end of the first pad group 3 is circular, and the circumference of the circle is the circumference length of one end of the first pad group 3. The circumference length of one end of the first pad group 3 is the first length, and the arc length of the other end of the first friction pad 31 is 1 / 2 to 3 / 4 of the first length, and the arc length of the other end of the second friction pad 32 is 1 / 4 to 1 / 2 of the first length. The outer diameter of the first pad group 3 in the cylindrical structure is 0.4mm to 0.5mm. In the first pad group 3, the length of the first friction pad 31 is longer than that of the second friction pad 32, and the thickness of the first friction pad 31 is thicker than that of the second friction pad 32. By utilizing the length difference and thickness difference between the first friction pad 31 and the second friction pad 32, the elastic force of the first pad group 3 is further optimized, so that it can have sufficient friction force on brackets of different sizes.

[0047] An exemplary use process of this embodiment:

[0048] like Figures 1 to 5 As shown, the stent is first sleeved on the push guide wire 2, and the stent is located at the first pad group 3, that is, the first pad group 3 is located in the stent, and then the stent is set in the microcatheter 1 together with the push guide wire 2. The microcatheter 1 limits the stent in a compressed state and prevents the stent from expanding. An angle is formed between the other end of the first friction pad 31 and the other end of the second friction pad 32. As the push guide wire 2 moves toward the distal end in the microcatheter 1, the other end of the first friction pad 31 and the other end of the second friction pad 32 move toward each other, and the first friction pad 31 will wrap the second friction pad 32, or the second friction pad 32 will wrap the first friction pad 31. At the same time, the first friction pad 31 and the second friction pad 32 will apply a supporting force to the stent, and the stent will be clamped by the cooperation of the first pad group 3 and the microcatheter 1.

[0049] When the inner diameter of the microcatheter 1 is small, the other end of the first friction pad 31 and the other end of the second friction pad 32 move toward each other, and the angle between them gradually decreases until the angle disappears. At this time, the first friction pad 31 and the second friction pad 32 are arranged to form a cylindrical structure.

[0050] When the inner diameter of the microcatheter 1 is large, the other end of the first friction pad 31 and the other end of the second friction pad 32 move toward each other, and the angle between them gradually decreases, but the angle does not disappear, and the outward expansion force of the other end of the first friction pad 31 and the other end of the second friction pad 32 cooperates with the microcatheter 1 to clamp the stent.

[0051] A drug stent delivery device is disclosed in the prior art, and its publication number is CN117338496B. The drug stent disclosed in the prior art is wrapped with a protective umbrella and a protective sub-umbrella to avoid the wear of the drug coating of the drug stent during transportation.

[0052] Compared with the prior art, the adaptive stent delivery system of this embodiment is provided with a first friction pad 31 and a second friction pad 32 on the push guide wire 2, and the other end of the first friction pad 31 and the other end of the second friction pad 32 are arranged in a direction away from each other, and the stent is supported outward by the tension formed between the first friction pad 31 and the second friction pad 32, and the tension between the first friction pad 31 and the second friction pad 32 is further optimized by the length difference and thickness difference between the first friction pad 31 and the second friction pad 32, and the stent is clamped by cooperating with the microcatheter 1, and the first pad group 3 can be adapted to a variety of microcatheters 1 with different inner diameters while ensuring that the first pad group 3 and the microcatheter 1 have sufficient clamping force on the stent, which not only facilitates the transportation of the stent, but also prevents the stent from being unloaded. When the size of the stent is large and a microcatheter 1 with a large inner diameter is required, the angle between the first friction pad 31 and the second friction pad 32 changes slightly, ensuring that the first pad group 3 has sufficient outward tension. When the size of the stent is small and a microcatheter 1 with a small inner diameter is required, the angle between the first friction pad 31 and the second friction pad 32 varies greatly, and the first friction pad 31 and the second friction pad 32 may even be arranged in a cylindrical shape to ensure that the first pad group 3 has sufficient outward tension and can also adapt to the microcatheter 1 with a small inner diameter.

[0053] In this embodiment, the structure of the first pad group 3 can be further improved, as follows:

[0054] Optionally, the thickness of the first friction pad 31 is 0.2 mm to 0.4 mm. By further limiting the thickness of the first friction pad 31, the elastic force of the first friction pad 31 is improved.

[0055] Optionally, the thickness of the second friction pad 32 is 0.1 mm to 0.3 mm. By further limiting the thickness of the second friction pad 32, the elastic force of the second friction pad 32 is improved.

[0056] Optionally, the above two optional technical solutions may be combined to improve the elasticity of the first friction pad 31 and the second friction pad 32 at the same time.

[0057] Optionally, of course, the length of the first friction pad 31 and its thickness can be combined to change the elastic force of the first friction pad 31, and the length of the second friction pad 32 and its thickness can be combined to change the elastic force of the second friction pad 32. Through the above combination, the outward tension between the first friction pad 31 and the second friction pad 32 is optimized to facilitate better adaptation to microcatheters 1 with different inner diameters. Figure 6 As shown, after the bracket is released, it is also convenient for the first friction pad 31 and the second friction pad 32 to turn, as shown in FIG. Figure 6As shown by the middle dotted line, the other end of the first friction pad 31 and the other end of the second friction pad 32 are arranged toward the distal end, so that it is convenient for the first pad group 3 to be pulled out along with the pushing guide wire 2.

[0058] You can select any one of the above optional technical solutions.

[0059] Optional, such as Figure 1 , Figure 2 As shown, a guide spring 21 is also provided at the distal end of the push guide wire 2, and the distal end of the guide spring 21 is rounded. This arrangement can not only prevent the guide spring 21 from damaging the inner wall of the blood vessel, but also increase the flexibility of the push guide wire 2 near the distal end, making it easier to move toward the distal end.

[0060] Second embodiment

[0061] This embodiment also proposes an adaptive stent delivery device. The second embodiment is a further improvement on the first embodiment. The improvement is that the adaptive stent delivery device further includes a second pad group 4, which is arranged on the push guide wire 2 and is located at an end of the first pad group 3 close to the proximal end. The structure and arrangement of the second pad group 4 are as follows:

[0062] like Figure 5 , Figure 6 As shown, the second pad group 4 includes a third friction pad 41 and a fourth friction pad 42. A fixing ring 22 is provided on the push guide wire 2, and one end of the third friction pad 41 and one end of the fourth friction pad 42 are fixed to the push guide wire 2 through the fixing ring 22, and the other end of the third friction pad 41 and the other end of the fourth friction pad 42 are both arranged toward the proximal end, and the other end of the third friction pad 41 and the other end of the fourth friction pad 42 are arranged in a direction away from each other, and an angle is formed between the third friction pad 41 and the fourth friction pad 42.

[0063] In this embodiment, if Figures 5 to 10 As shown, the third friction pad 41 and the fourth friction pad 42 are respectively arranged on both sides of the push guide wire 2 along its length direction. Such an arrangement makes it easy for the third friction pad 41 and the fourth friction pad 42 to be arranged into a cylindrical structure with the push guide wire 2 as the center. The third friction pad 41 and the fourth friction pad 42 are both arc-shaped sheets. When they are arranged into a cylindrical structure, the third friction pad 41 is in contact with both sides of the fourth friction pad 42 along its length direction, or the third friction pad 41 covers both sides of the fourth friction pad 42, or the fourth friction pad 42 covers both sides of the third friction pad 41. In order to facilitate the introduction of the arc length of the other end of the third friction pad 41 and the arc length of the other end of the fourth friction pad 42, the third friction pad 41 and the fourth friction pad 42 are arranged as shown in the figure. Fig. 9In the state of the cylindrical structure shown, the second pad group 4 is introduced. In the state of the cylindrical structure, the cross-sectional shape of one end of the second pad group 4 is circular, and the circumference of the circle is the circumference length of one end of the second pad group 4, and the circumference length of one end of the second pad group 4 is the second length, and the arc length of the other end of the third friction pad 41 is 1 / 2 to 3 / 4 of the second length, and the arc length of the other end of the fourth friction pad 42 is 1 / 4 to 1 / 2 of the second length. The outer diameter of the second pad group 4 in the cylindrical structure is 0.55mm to 0.6mm. In the second pad group 4, the third friction pad 41 is longer than the fourth friction pad 42, and the third friction pad 41 is thicker than the fourth friction pad 42. By utilizing the length difference and thickness difference between the third friction pad 41 and the fourth friction pad 42, the elastic force of the second pad group 4 is further optimized, so that it can have sufficient friction for brackets of different sizes.

[0064] The adaptive stent delivery system of this embodiment is provided with a third friction pad 41 and a fourth friction pad 42 on the push guide wire 2, and the other end of the third friction pad 41 and the other end of the fourth friction pad 42 are provided in a direction away from each other, and the stent is supported outward by the tension formed between the third friction pad 41 and the fourth friction pad 42, and the tension between the third friction pad 41 and the fourth friction pad 42 is further optimized by the length difference and thickness difference between the third friction pad 41 and the fourth friction pad 42, and the stent is clamped by cooperating with the microcatheter 1, and the second pad group 4 can be adapted to a variety of microcatheters 1 with different inner diameters while ensuring that the second pad group 4 and the microcatheter 1 have sufficient clamping force on the stent, which not only facilitates the transportation of the stent, but also prevents the stent from being unloaded. When the size of the stent is large and a microcatheter 1 with a large inner diameter is required, the angle between the third friction pad 41 and the fourth friction pad 42 changes slightly, ensuring that the second pad group 4 has sufficient outward tension. When the size of the stent is small and a microcatheter 1 with a small inner diameter is required, the angle between the third friction pad 41 and the fourth friction pad 42 varies greatly, and the third friction pad 41 and the fourth friction pad 42 may even be arranged in a cylindrical shape to ensure that the second pad group 4 has sufficient outward tension and can also adapt to the microcatheter 1 with a small inner diameter.

[0065] Compared with the first embodiment, this embodiment simultaneously arranges a first pad group 3 of a smaller size and a second pad group 4 of a larger size on the push guide wire 2, and the second pad group 4 cooperates with the first pad group 3, so that the adaptive stent delivery system of this embodiment can adapt to more microcatheters 1 with different inner diameters. The simultaneous arrangement of the first pad group 3 and the second pad group 4 can also reduce the risk of stent unloading due to failure of one pad group.

[0066] Alternatively, if Figure 7As shown, the distance L between the first pad group 3 and the second pad group 4 is 3 mm to 10 mm. By limiting the distance between the first pad group 3 and the second pad group 4, after the bracket is released, it is also convenient for the third friction pad 41 and the fourth friction pad 42 to turn, and the other end of the third friction pad 41 and the other end of the fourth friction pad 42 are arranged toward the distal end, so that the second pad group 4 is convenient to be withdrawn along with the push guide wire 2. The risk of mutual interference between the first pad group 3 and the second pad group 4 is avoided.

[0067] Third embodiment

[0068] This embodiment also proposes an adaptive stent delivery device. The third embodiment is a further improvement based on the first or second embodiment. The improvement is that the adaptive stent delivery device further includes an auxiliary component 5. The auxiliary component 5 is arranged on the push guide wire 2. The arrangement is specifically as follows:

[0069] Optional, such as Figure 5 As shown, the auxiliary component 5 is arranged at the first pad group 3, specifically, the auxiliary component 5 is located between the first friction pad 31 and the second friction pad 32. The auxiliary component 5 includes a first spring 51 and a sliding block 52. The sliding block 52 is cylindrical, and has a hole for the push guide wire 2 to pass through. The outer diameter of one end of the sliding block 52 is smaller than the outer diameter of the other end. The first spring 51 is sleeved on the push guide wire 2, and the end of the first spring 51 close to the proximal end is fixedly connected to the push guide wire 2. The sliding block 52 is sleeved on the push guide wire 2, and the end of the sliding block 52 with a large outer diameter is arranged close to the proximal end, and the end of the sliding block 52 with a large outer diameter is fixedly connected to the other end of the first spring 51. The end of the sliding block 52 with a small outer diameter is located close to the distal end and is located between the first friction pad 31 and the second friction pad 32. The sliding block 52 is located in the middle of the second friction pad 32. When the first friction pad 31 or the second friction pad 32 is not damaged, the angle between the first friction pad 31 and the second friction pad 32 is formed by the elastic force of the two. When the angle between the first friction pad 31 and the second friction pad 32 gradually decreases, the first friction pad 31 and the second friction pad 32 will squeeze the sliding block 52 to move toward the proximal end, and the sliding block 52 will squeeze the first spring 51 and compress the first spring 51. When the first friction pad 31 or the second friction pad 32 is damaged, resulting in a decrease in its elasticity and being unable to ensure the clamping force of the first pad group 3 and the microcatheter 1 on the stent, the first spring 51 of the auxiliary component 5 can drive the sliding block 52 to move toward the distal end, and make the angle between the first friction pad 31 and the second friction pad 32 still exist, so as to ensure that the first pad group 3 has an external tension, so as to facilitate the first pad group 3 and the microcatheter 1 to clamp the stent.

[0070] Optional, such as Figure 5As shown, the auxiliary component 5 is arranged at the second pad group 4, specifically, the auxiliary component 5 is located between the third friction pad 41 and the fourth friction pad 42. The auxiliary component 5 includes a first spring 51 and a sliding block 52. The sliding block 52 is cylindrical, and the sliding block 52 has a hole for the push guide wire 2 to pass through. The outer diameter of one end of the sliding block 52 is smaller than the outer diameter of the other end. The first spring 51 is sleeved on the push guide wire 2, and the end of the first spring 51 close to the proximal end is fixedly connected to the push guide wire 2. The sliding block 52 is sleeved on the push guide wire 2, and the end of the sliding block 52 with a large outer diameter is arranged close to the proximal end, and the end of the sliding block 52 with a large outer diameter is fixedly connected to the other end of the first spring 51. The end of the sliding block 52 with a small outer diameter is located near the distal end and is located between the third friction pad 41 and the fourth friction pad 42. The sliding block 52 is located in the middle of the fourth friction pad 42. When the third friction pad 41 or the fourth friction pad 42 is not damaged, the angle between the third friction pad 41 and the fourth friction pad 42 is formed by the elastic force of the third friction pad 41 and the fourth friction pad 42. When the angle between the third friction pad 41 and the fourth friction pad 42 gradually decreases, the third friction pad 41 and the fourth friction pad 42 will squeeze the sliding block 52 to move toward the proximal end, and the sliding block 52 will squeeze the first spring 51 and compress the first spring 51. When the third friction pad 41 or the fourth friction pad 42 is damaged, resulting in a decrease in its elasticity and being unable to ensure the clamping force of the second pad group 4 and the microcatheter 1 on the stent, the first spring 51 of the auxiliary component 5 can drive the sliding block 52 to move toward the distal end, and make the third friction pad 41 and the fourth friction pad 42 still have an angle, so as to ensure that the second pad group 4 has an external tension, so that the second pad group 4 and the microcatheter 1 can clamp the stent.

[0071] Optionally, the above two optional technical solutions may be combined, so that the adaptive stent delivery system disclosed in this embodiment has double protection.

[0072] You can select any one of the above optional technical solutions.

[0073] Fourth embodiment

[0074] This embodiment also proposes an adaptive stent delivery device. The fourth embodiment is a further improvement based on any one of the first to third embodiments, and is specifically as follows:

[0075] like Fig.10 , Fig.11 , Fig.12As shown, the adaptive stent delivery device also includes a recovery pad 61. A fixing ring 22 is provided on the push guide wire 2, and one end of the recovery pad 61 is fixed on the push guide wire 2 by the fixing ring 22, and the other end of the recovery pad 61 is arranged toward the distal end. The recovery pad 61 is located at one end of the first pad group 3 close to the distal end. An angle is formed between the recovery pad 61 and the push guide wire 2. In this embodiment, the recovery pad 61 can be centered on the push guide wire 2 and surrounded by a cylindrical structure. The recovery pad 61 is in the shape of an arc sheet. In order to facilitate the introduction of the arc length of the other end of the recovery pad 61, the recovery pad 61 is introduced in the state of a cylindrical structure. When the recovery pad 61 is in the state of a cylindrical structure, the cross-sectional shape of the recovery pad 61 is circular, and the outer diameter of the recovery pad 61 is 0.55mm to 0.6mm. In the case where the stent is partially released but not completely released, if the first pad group 3 and the second pad group 4 fail, the half-released stent can also be recovered by the recovery pad 61.

[0076] Fifth embodiment

[0077] This embodiment also proposes an adaptive stent delivery device. The fifth embodiment is a further improvement based on any one of the first to fourth embodiments, and is specifically as follows:

[0078] Alternatively, if Figure 3 , Fig.13 As shown, the first friction pad 31 has a plurality of notches 62 on both sides along its length direction, and the plurality of notches 62 located on both sides of the first friction pad 31 are arranged in sequence. The plurality of notches 62 located on one side of the first friction pad 31 are symmetrically arranged with the plurality of notches 62 located on the other side thereof, or the plurality of notches 62 located on one side of the first friction pad 31 are staggered with the plurality of notches 62 located on the other side thereof, and such an arrangement makes it easier for the first friction pad 31 and the second friction pad 32 to be arranged into a cylindrical structure.

[0079] Alternatively, if Figure 8 , Fig.13 As shown, the third friction pad 41 has a plurality of notches 62 on both sides along its length direction, and the plurality of notches 62 located on both sides of the third friction pad 41 are arranged in sequence. The plurality of notches 62 located on one side of the third friction pad 41 are symmetrically arranged with the plurality of notches 62 located on the other side thereof, or the plurality of notches 62 located on one side of the third friction pad 41 are staggered with the plurality of notches 62 located on the other side thereof, and such an arrangement makes it easier for the third friction pad 41 and the fourth friction pad 42 to be arranged into a cylindrical structure.

[0080] Alternatively, if Fig.11 , Fig.13As shown, the recovery pad 61 has a plurality of notches 62 on both sides along its length direction, and the plurality of notches 62 respectively located on both sides of the recovery pad 61 are arranged in sequence. The plurality of notches 62 located on one side of the recovery pad 61 are symmetrically arranged with the plurality of notches 62 located on the other side thereof, or the plurality of notches 62 located on one side of the recovery pad 61 are staggered with the plurality of notches 62 located on the other side thereof, and such an arrangement makes it easier for the recovery pad 61 to be surrounded into a cylindrical structure.

[0081] Any one of the above optional technical solutions can be selected. Of course, the above optional technical solutions can also be used in combination.

[0082] The above description and the accompanying drawings fully illustrate the embodiments of the present invention so that those skilled in the art can practice them. Other embodiments may include structural and other changes. The embodiments represent only possible variations. Unless explicitly required, individual components and functions are optional, and the order of operations may vary. Parts and features of some embodiments may be included in or replace parts and features of other embodiments. The embodiments of the present invention are not limited to the structures described above and shown in the accompanying drawings, and various modifications and changes may be made without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.

Claims

1. An adaptive stent delivery device, characterized in that: include: A microcatheter (1) comprising a catheter lumen (11); A push guide wire (2), one end of which is movably disposed in the catheter cavity (11), and the other end of which is located through the catheter cavity (11) to the outside; The first pad group (3) comprises a first friction pad (31) and a second friction pad (32), wherein one end of the first friction pad (31) and the second friction pad (32) are both arranged on the push guide wire (2); the other end of the first friction pad (31) and the other end of the second friction pad (32) are arranged in a direction away from each other, and an angle is formed between the two; the first friction pad (31) and the second friction pad (32) are respectively arranged on both sides of the push guide wire (2) along its length direction; the first friction pad (31) is longer than the second friction pad (32), and the first friction pad (31) is thicker than the second friction pad (32); The first pad group (3) is capable of moving toward the distal end or the proximal end along with the push guide wire (2); when the first friction pad (31) and the second friction pad (32) are arranged in a cylindrical shape, the outer diameter of the first pad group (3) is 0.4 mm to 0.5 mm; the circumference of one end of the cylindrical first pad group (3) is a first length, the first friction pad (31) and the second friction pad (32) are both in the shape of arc sheets, the arc length of the other end of the first friction pad (31) is 1 / 2 to 3 / 4 of the first length, and the arc length of the other end of the second friction pad (32) is 1 / 4 to 1 / 2 of the first length.

2. The adaptive stent delivery device according to claim 1, characterized in that: The thickness of the first friction pad (31) is 0.2 mm to 0.4 mm.

3. The adaptive stent delivery device according to claim 1, characterized in that: The thickness of the second friction pad (32) is 0.1 mm to 0.3 mm.

4. The adaptive stent delivery device according to claim 1, characterized in that: Also includes: The second pad group (4) is arranged on the pushing guide wire (2) and is located at an end of the first pad group (3) close to the proximal end.

5. The adaptive stent delivery device according to claim 4, characterized in that: The second pad group (4) comprises a third friction pad (41) and a fourth friction pad (42); one end of the third friction pad (41) and the fourth friction pad (42) are both arranged on the push guide wire (2); the other end of the third friction pad (41) and the other end of the fourth friction pad (42) are arranged in a direction away from each other, and an angle is formed between the two; the third friction pad (41) and the fourth friction pad (42) are respectively arranged on both sides of the push guide wire (2) along its length direction; the third friction pad (41) is longer than the fourth friction pad (42), and the third friction pad (41) is thicker than the fourth friction pad (42); The second pad group (4) can move toward the distal end or the proximal end along with the push guide wire (2); when the third friction pad (41) and the fourth friction pad (42) are arranged in a cylindrical shape, the outer diameter of the second pad group (4) is 0.55 mm to 0.6 mm; the circumference of one end of the cylindrical second pad group (4) is the second length, the third friction pad (41) and the fourth friction pad (42) are both in the shape of arc sheets, the arc length of the other end of the third friction pad (41) is 1 / 2 to 3 / 4 of the second length, and the arc length of the other end of the fourth friction pad (42) is 1 / 4 to 1 / 2 of the second length.

6. The adaptive stent delivery device according to claim 4, characterized in that: The distance between the first pad group (3) and the second pad group (4) is 3 mm to 10 mm.

7. The adaptive stent delivery device according to claim 5, characterized in that: It also includes an auxiliary component (5) arranged on the push guide wire (2), wherein the auxiliary component (5) is located between the first friction pad (31) and the second friction pad (32); the auxiliary component (5) includes: A first spring (51) is sleeved on the push guide wire (2); one end of the first spring (51) is fixedly connected to the push guide wire (2); The sliding block (52) is sleeved on the pushing guide wire (2) and is located in the middle of the first friction pad (31) or the second friction pad (32); the sliding block (52) is fixedly connected to the other end of the first spring (51).

8. The adaptive stent delivery device according to claim 5, characterized in that: It also includes an auxiliary component (5) arranged on the push guide wire (2), wherein the auxiliary component (5) is located between the third friction pad (41) and the fourth friction pad (42); the auxiliary component (5) includes: A first spring (51) is sleeved on the push guide wire (2); one end of the first spring (51) is fixedly connected to the push guide wire (2); The sliding block (52) is sleeved on the pushing guide wire (2) and is located in the middle of the third friction pad (41) or the fourth friction pad (42); the sliding block (52) is fixedly connected to the other end of the first spring (51).

9. The adaptive stent delivery device according to claim 1, characterized in that: Also includes: A recovery pad (61) has one end disposed on the pushing guide wire (2) and the other end disposed toward the distal end; the recovery pad (61) is located at one end of the first pad group (3) close to the distal end.

10. The adaptive stent delivery device according to claim 9, characterized in that: When the recovery pad (61) is arranged in a cylindrical shape, the outer diameter of the recovery pad (61) is 0.55 mm to 0.6 mm.

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