Pushing mechanism and stent delivery system

Abstract

The present invention particularly relates to a pushing mechanism and a stent delivery system, comprising: a pushing guide wire, the end of which near the distal end has a massage section; a first limiter and a second limiter, respectively provided at both ends of the massage section; a recovery pad, sleeved on the massage section and located between the first limiter and the second limiter; the length of the recovery pad is less than the length of the massage section; when in use, the massage section is driven to move toward the distal end or the proximal end by the pushing guide wire, the massage section vibrates during the movement, and the recovery pad vibrates to massage the kinked portion of the stent, so that the kinked portion is opened. It is only necessary to repeatedly perform the two driving operations of pushing the guide wire to drive the massage section toward the proximal end and pushing the guide wire to drive the massage section toward the distal end, so that the massage section vibrates and hits the inner cavity of the recovery pad, and the recovery pad vibrates to massage the position where the stent is kinked, so that the position where the stent is kinked is transformed into an open state.

Description

Technical Field

[0001] The present invention relates to the technical field of stent delivery devices, and in particular to a pushing mechanism and a stent delivery system. Background Art

[0002] As an interventional therapy device, stents are widely used to treat various vascular diseases, such as vascular stenosis and aneurysms. The delivery guidewire is a key component of the stent delivery system. The coordination of the delivery guidewire and the catheter ensures the stent is loaded and delivered accurately and safely to the diseased area within the blood vessel.

[0003] Especially in the delivery of stents, due to the complex structure, weak blood vessel walls and tortuous course of cerebral blood vessels, higher requirements are placed on the flexibility, pushability, controllability and safety of the delivery guidewire. The particularity of intracranial blood vessels determines that the delivery guidewire not only needs to have good passability to cope with narrow and tortuous blood vessel paths, but also needs to maintain sufficient stability during operation to avoid damage to the intracranial blood vessel walls. During the release of the stent, especially at the bends of tortuous blood vessels, due to inadequate tension control, the stent is prone to kinking, that is, the two ends of the stent are open but the middle is not open, such as Figure 1 、 Figure 2 In response to stent kinking, surgeons usually choose to retract and re-release the stent. However, this operation not only damages the stent, but also prolongs the operation time, damages the inner wall of the blood vessel, and is prone to acute thrombosis.

[0004] If the stent has been completely released in the blood vessel, it is necessary to massage the kinked part of the stent with a balloon catheter or a micro guidewire to open the kinked part. Since the two ends of the stent have been anchored, even if the kinked part of the stent is opened by expanding the stent with a balloon catheter or massaging the stent with a micro guidewire, the kinked part will not be opened enough and the stent will not fit the inner wall of the blood vessel. There is even a risk that the stent cannot be opened. Summary of the Invention

[0005] In order to solve or at least partially solve the above technical problems, the present invention provides a pushing mechanism and a stent delivery system.

[0006] The present invention provides a pushing mechanism, which includes a pushing guide wire, a first limiting member, a second limiting member, and a recovery pad. The end of the pushing guide wire close to the distal end is provided with a massage section; the first limiting member and the second limiting member are respectively provided at both ends of the massage section; the recovery pad is sleeved on the massage section and is located between the first limiting member and the second limiting member; the length of the recovery pad is smaller than the length of the massage section; when in use, the massage section is driven to move toward the distal end or the proximal end by the pushing guide wire, the massage section vibrates during the movement, and the recovery pad is vibrated to massage the kinked part of the bracket so that the kinked part can be opened.

[0007] Optionally, the massage section is wavy, spiral, or variable-diameter spiral; when the recovery pad is sleeved on the massage section, a portion of the massage section is deformed and located inside the recovery pad; the outer diameter of another portion of the massage section located outside the recovery pad is larger than the inner diameter of the recovery pad, and smaller than the outer diameter of the recovery pad.

[0008] Optionally, the middle part of the massage section is in the shape of a mesh tube; when the recovery pad is sleeved on the massage section, a part of the massage section is deformed and located inside the recovery pad; the outer diameter of the other part of the massage section located outside the recovery pad is larger than the inner diameter of the recovery pad, and smaller than the outer diameter of the recovery pad.

[0009] Optionally, the push guide wire also includes: a main body section and a reduced diameter section, one end of the main body section is connected to the massage section through the reduced diameter section; the wire diameter of the massage section is smaller than the wire diameter of the main body section; the wire diameter of the reduced diameter section near the proximal end is the same as the wire diameter of the main body section, and the wire diameter of the reduced diameter section near the distal end is the same as the wire diameter of the massage section, and the wire diameter of the reduced diameter section gradually decreases from the proximal end to the distal end; a distal spring is provided at one end of the massage section near the distal end.

[0010] Optionally, the recovery pad has an adjustment hole; the adjustment hole is connected to the inner cavity of the recovery pad; or, the adjustment hole is not connected to the inner cavity of the recovery pad; when the adjustment hole is not connected to the inner cavity of the recovery pad, the depth of the adjustment hole is 1 / 20 to 19 / 20 of the thickness of the recovery pad tube wall.

[0011] Optionally, the recovery pad is provided with long strip-shaped adjustment holes on its circumference; there are two groups of adjustment holes, one group of adjustment holes is located on one side of the recovery pad, and the other group of adjustment holes is located on the other side of the recovery pad, and the two groups of adjustment holes are symmetrically arranged or staggered; each group of adjustment holes includes multiple adjustment holes, and the multiple adjustment holes are arranged in sequence along the axial direction of the recovery pad.

[0012] Optionally, the recovery pad is provided with long strip-shaped adjustment holes in the axial direction; the number of adjustment holes is one group or multiple groups. When the number of adjustment holes is multiple groups, the multiple groups of adjustment holes are arranged in sequence along the axial direction of the recovery pad, and the two adjacent groups of adjustment holes are symmetrically arranged or staggered; each group of adjustment holes includes multiple adjustment holes, and the multiple adjustment holes are arranged around the axis of the recovery pad.

[0013] Optionally, the adjustment holes are circular holes, diamond holes, or triangular holes; there are multiple groups of adjustment holes, and the multiple groups of adjustment holes are arranged in sequence along the axial direction of the recovery pad, and the two adjacent groups of adjustment holes are symmetrically arranged or staggered; each group of adjustment holes includes multiple adjustment holes, and the multiple adjustment holes are arranged around the axis of the recovery pad.

[0014] Optionally, a colloid is provided in all or part of the adjustment holes; the colloid is formed by mixing any one or more of epoxy resin, acrylate, silicone, and polyurethane.

[0015] Optionally, the height of the colloid is the same as the depth of the adjustment hole; or, the height of the colloid is less than the depth of the adjustment hole; or, the height of the colloid is 0.1 mm to 1 mm higher than the depth of the adjustment hole.

[0016] Optionally, a positioning groove is provided in the adjustment hole, and a positioning protrusion is provided on the colloid that is compatible with the positioning groove. When the positioning protrusion is provided in the positioning groove, the colloid is clamped with the recovery pad; and / or, a chamfer is provided at one end of the adjustment hole close to the inner cavity, and an edge is provided at one end of the colloid close to the inner cavity that is compatible with the chamfer. When the edge conflicts with the chamfer, the chamfer serves to limit the colloid.

[0017] The present invention further provides a stent delivery system, which comprises a pushing mechanism as described in any one of the above items; the pushing mechanism is slidably disposed in the lumen of the microcatheter.

[0018] Compared to the prior art, in this embodiment, when a stent kinks within a microcatheter, i.e., the two ends of the stent are open but the middle is not, the surgeon does not need to recover and re-release the stent, which shortens the surgical time, reduces damage to the inner wall of the blood vessel, and reduces the risk of acute thrombosis. During the delivery of the stent, the surgeon only needs to repeatedly push the guide wire to drive the massage segment to move proximally and then push the guide wire to drive the massage segment to move distally. This causes the massage segment to vibrate, and the vibrating massage segment hits the inner cavity of the recovery pad, causing the recovery pad to vibrate and massage the location where the stent kinked, so that the location where the stent kinked is converted to an open state. Through the cooperation of the push mechanism disclosed in this embodiment and the microcatheter, during the stent implantation process, the stent in the open state is further adhered to the inner wall of the blood vessel after being released within the blood vessel, reducing the risk of the stent failing to open. There is no need to subsequently expand the location where the stent kinked using a balloon catheter or massage the location where the stent kinked using a microguide wire. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] To more clearly illustrate the embodiments of the present invention, the following briefly describes the relevant drawings. It should be understood that the drawings described below are only used to illustrate some embodiments of the present invention, and those skilled in the art can also obtain many other technical features and connection relationships not described herein based on these drawings.

[0020] Figure 1 Background technology Figure 1 ;

[0021] Figure 2 Background technology Figure 2 ;

[0022] Figure 3 This is a schematic diagram of an embodiment of a pushing mechanism of the present invention. Figure 1 ;

[0023] Figure 4 This is a cross-sectional view of an embodiment of a recovery pad of a pushing mechanism of the present invention. Figure 1 ;

[0024] Figure 5 is a schematic diagram of an embodiment of the present invention;

[0025] Figure 6 This is a schematic diagram of an embodiment of a pushing mechanism of the present invention. Figure 2 ;

[0026] Figure 7 This is a schematic diagram of an embodiment of a pushing mechanism of the present invention. Figure 3 ;

[0027] Figure 8 It is a partial schematic diagram of an embodiment of a massage section of a pushing mechanism of the present invention;

[0028] Figure 9 This is a schematic diagram of an embodiment of a pushing mechanism of the present invention. Figure 4 ;

[0029] Figure 10 This is a schematic diagram of an embodiment of a pushing mechanism of the present invention. Figure 5 ;

[0030] Figure 11 This is a schematic diagram of an embodiment of a pushing mechanism of the present invention. Figure 6 ;

[0031] Figure 12 This is a schematic diagram of an embodiment of a pushing mechanism of the present invention. Figure 7 ;

[0032] Figure 13 This is a cross-sectional view of an embodiment of a recovery pad of a pushing mechanism of the present invention. Figure 2 ;

[0033] Figure 14 This is a cross-sectional view of an embodiment of a recovery pad of a pushing mechanism of the present invention. Figure 3 ;

[0034] Figure 15 This is a schematic diagram of an embodiment of a recovery pad of a pushing mechanism of the present invention. Figure 1 ;

[0035] Figure 16 This is a schematic diagram of an embodiment of a recovery pad of a pushing mechanism of the present invention. Figure 2 ;

[0036] Figure 17 This is a schematic diagram of an embodiment of a recovery pad of a pushing mechanism of the present invention. Figure 3 ;

[0037] Figure 18 This is a schematic diagram of an embodiment of a recovery pad of a pushing mechanism of the present invention. Figure 4

[0038] Figure 19 This is a schematic diagram of an embodiment of a recovery pad of a pushing mechanism of the present invention. Figure 5

[0039] Figure 20 This is a schematic diagram of an embodiment of a recovery pad of a pushing mechanism of the present invention. Figure 6

[0040] Figure 21 This is a schematic diagram of an embodiment of a recovery pad of a pushing mechanism of the present invention. Figure 7

[0041] Figure 22 This is a cross-sectional view of an embodiment of a recovery pad of a pushing mechanism of the present invention. Figure 4 ;

[0042] Figure 23 This is a cross-sectional view of an embodiment of a recovery pad of a pushing mechanism of the present invention. Figure 5 .

[0043] Description of reference numerals:

[0044] 1. Push guide wire; 11. Massage section; 12. Distal spring; 13. Main body section; 14. Reduced diameter section; 15. Reinforcement spring; 21. First limiter; 22. Second limiter; 3. Recovery pad; 30. Inner cavity; 31. Metal ring; 32. Adjustment hole; 33. Positioning groove; 34. Chamfer; 4. Colloid; 41. Positioning protrusion; 42. Edge; 5. Microcatheter; 51. Lumen; 6. Stent. DETAILED DESCRIPTION

[0045] In order to be able to understand the features and technical content of the embodiments of the present disclosure in more detail, the implementation of the embodiments of the present disclosure is described in detail below in conjunction with the accompanying drawings. The accompanying drawings are for reference only and are not used to limit the embodiments of the present disclosure. In the following technical description, for the sake of 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.

[0046] In the description and claims of the embodiments of the present disclosure, as well as in the accompanying drawings, the terms "first," "second," and the like are used to distinguish similar items and are not necessarily used to describe a particular order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate to describe the embodiments of the present disclosure herein. In addition, the terms "including," "having," and any variations thereof are intended to cover non-exclusive inclusions.

[0047] In the embodiments of the present disclosure, 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 intended to better describe the embodiments of the present disclosure and their embodiments, and are not intended to limit the indicated devices, elements or components to having 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 certain circumstances. For those of ordinary skill in the art, the specific meanings of these terms in the embodiments of the present disclosure can be understood according to specific circumstances.

[0048] Furthermore, the terms "disposed," "connected," and "fixed" should be interpreted broadly. For example, "connected" can mean a fixed connection, a removable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be a direct connection, an indirect connection through an intermediary, or an internal connection between two devices, elements, or components. Those skilled in the art will understand the specific meanings of these terms in the embodiments of this disclosure based on the specific circumstances.

[0049] Unless otherwise specified, the term "plurality" means two or more and "plurality" means two or more.

[0050] It should be noted that, unless there is any conflict, the embodiments and features in the embodiments of the present disclosure can be combined with each other.

[0051] 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.

[0052] The inventors have discovered that during the stent's release process, especially at the bends of tortuous blood vessels, the stent is prone to kinking due to inadequate tension control.

[0053] In view of this, the inventors of the present invention provide a pushing mechanism to solve the above problems.

[0054] First embodiment

[0055] A pushing mechanism mentioned in this embodiment, such as Figure 3As shown, the pushing mechanism includes a pushing guide wire 1, a first limiting member 21, a second limiting member 22, and a recovery pad 3. The pushing guide wire 1 has a massage section 11, which is arranged at the end of the pushing guide wire 1 near the distal end. The first limiting member 21 and the second limiting member 22 are both annular structures. The first limiting member 21 and the second limiting member 22 are both sleeved on the massage section 11 of the pushing guide wire 1, and the first limiting member 21 and the second limiting member 22 are fixedly connected to the pushing guide wire 1. For example, the first limiting member 21 and the second limiting member 22 can be fixedly connected to the pushing guide wire 1 by laser welding. The first limiting member 21 is located at the end of the massage section 11 near the distal end, and the second limiting member 22 is located at the end of the massage section 11 near the proximal end. The recovery pad 3 is sleeved on the massage section 11 of the pushing guide wire 1, and the recovery pad 3 is located between the first limiting member 21 and the second limiting member 22. The recovery pad 3 can move toward the distal end or the proximal end along the length direction of the pushing guide wire 1. The length of the recovery pad 3 is shorter than the length of the massage section 11. The outer diameter of the first limiting member 21 is the same as the outer diameter of the second limiting member 22. The inner diameter of the recovery pad 3 is smaller than the outer diameter of the first limiting member 21, and the outer diameter of the recovery pad 3 is larger than the outer diameter of the first limiting member 21. This arrangement limits the recovery pad 3 through the coordinated cooperation of the first limiting member 21 and the second limiting member 22, and allows the recovery pad 3 to move on the massage section 11.

[0056] Optionally, the first position-limiting member 21 can be made of any developing material among platinum tungsten, platinum iridium, and tantalum. Such a setting facilitates the operator to observe the position of the first position-limiting member 21 during the operation.

[0057] Optionally, the second limiting member 22 can be made of any developing material among platinum tungsten, platinum iridium, and tantalum. Such a setting facilitates the operator to observe the position of the second limiting member 22 during the operation.

[0058] Optionally, the recovery pad 3 can be made of a flexible material. The flexible material can be any one of silicone, TPU, PET, and Pebax. Of course, the flexible material can also be a mixture of multiple materials selected from silicone, TPU, PET, and Pebax. Such a setting is more conducive to the elastic deformation of the recovery pad 3 when moving toward the distal or proximal end, and at the same time, the outer diameter of the recovery pad 3 is increased. The recovery pad 3 located on the push guide wire 1 and the microcatheter 5 further enhance the force of clamping the stent 6, thereby reducing the risk of the stent 6 being unloaded.

[0059] Optionally, the length of the massage section 11 is 1.5 to 100 times the length of the recovery pad 3. Such a setting is conducive to the bending deformation of the push guide wire 1, making the push guide wire 1 more suitable for tortuous intracranial blood vessels. It can also ensure the massage strength of the recovery pad 3 on the stent 6, making it easier to open the stent 6.

[0060] Optional, such as Figure 4As shown, the recovery pad 3 has an inner cavity 30. In the present technical solution, the pushing mechanism also includes a plurality of metal rings 31, and the plurality of metal rings 31 are all arranged in the inner cavity 30 of the recovery pad 3. For example, the plurality of metal rings 31 can be arranged on the wall of the inner cavity 30 in an embedded manner. The plurality of metal rings 31 are arranged in sequence and spaced apart along the length direction of the recovery pad 3. The plurality of metal rings 31 can be made of any one of the developing materials selected from platinum tungsten, platinum iridium, and tantalum. Such an arrangement not only makes it convenient for the operator to observe the position of the recovery pad 3 during the operation, but also makes the movement of the recovery pad 3 on the massage section 11 smoother through the plurality of metal rings 31, and can also improve the massage effect of the recovery pad.

[0061] Optional, such as Figure 3 As shown, a distal spring 12 is provided at the distal end of the massage segment 11, one end of the distal spring 12 is fixedly connected to the distal end of the massage segment 11, and the other end of the distal spring 12 is provided with a round head, which can prevent damage to the inner wall of the blood vessel during the delivery of the stent 6.

[0062] The exemplary assembly process of the pushing mechanism disclosed in this embodiment is as follows:

[0063] like Figure 3 、 Figure 4 As shown, first, the second limiting member 22 is set on the massage section 11 of the push guide wire 1, and the second limiting member 22 is located at the end of the massage section 11 close to the proximal end, and the second limiting member 22 is fixedly connected to the push guide wire 1. Thereafter, the recovery pad 3 is sleeved on the massage section 11 of the push guide wire 1. Then, the first limiting member 21 is set on the massage section 11 of the push guide wire 1, and the first limiting member 21 is located at the end of the massage section 11 close to the distal end, and the first limiting member 21 is fixedly connected to the push guide wire 1. The recovery pad 3 can move on the massage section 11 between the first limiting member 21 and the second limiting member 22. Finally, a distal spring 12 is set at the end of the massage section 11 close to the distal end.

[0064] The exemplary use process of the push mechanism disclosed in this embodiment is as follows:

[0065] like Figures 3 to 5As shown, the push mechanism disclosed in this embodiment is arranged in the lumen 51 of the microcatheter 5, and the stent 6 is sleeved at the massage section 11 of the push mechanism, and the push mechanism and the microcatheter 5 cooperate to clamp the stent 6. When the operator wants to implant the stent 6 into the blood vessel, he only needs to drive the push guide wire 1 to move distally. During the process of driving the push guide wire 1 to move distally, the massage section 11 passes through the inner cavity 30 of the recovery pad 3 and moves distally, while the recovery pad 3 does not move. Subsequently, the second stopper 22 contacts the end of the recovery pad 3 near the proximal end. Through the cooperation of the push guide wire 1 and the second stopper 22, the recovery pad 3 is driven to move distally. During the process of the recovery pad 3 moving distally, due to the friction between the stent 6 and the lumen 51 of the microcatheter 5, the recovery pad 3 undergoes elastic deformation and increases the outer diameter of the recovery pad 3, thereby increasing the friction. As the friction increases, the strength of the recovery pad 3 and the microcatheter 5 on the push guide wire 1 to clamp the stent 6 is further enhanced, reducing the risk of the stent 6 being unloaded.

[0066] Of course, when the operator wants to recycle the stent 6, he only needs to drive the push guide wire 1 to move proximally. In the process of driving the push guide wire 1 to move proximally, the massage section 11 moves proximally through the inner cavity 30 of the recovery pad 3, while the recovery pad 3 does not move. Then the first limiter 21 contacts the end of the recovery pad 3 near the distal end. Through the coordinated cooperation of the push guide wire 1 and the first limiter 21, the recovery pad 3 is driven to move proximally. In the process of the recovery pad 3 moving proximally, due to the friction between the stent 6 and the lumen 51 of the microcatheter 5, the recovery pad 3 undergoes elastic deformation and increases the outer diameter of the recovery pad 3, thereby increasing the friction. As the friction increases, the strength of the recovery pad 3 and the microcatheter 5 on the push guide wire 1 to clamp the stent 6 is further enhanced, reducing the risk of the stent 6 being unloaded.

[0067] If the operator observes that the middle part of the stent 6 is kinked, during the release process of the stent 6, the operator first drives the pushing mechanism to continue to move distally, and the pushing mechanism causes the end of the stent 6 near the distal end to first pass through the outlet of the microcatheter 5 and enter the blood vessel for release. When the middle part of the stent 6 where the kink occurs is at or near the outlet of the microcatheter 5, the operator suspends the driving of the pushing mechanism, and the recovery pad 3 stops moving. The operator begins to massage the position where the stent 6 is kinked. Specifically, the operator drives the pushing guide wire 1 to move proximally, and the massage segment 11 passes through the inner cavity 30 of the recovery pad 3 and moves proximally. During the process of the massage segment 11 moving proximally, it will shake. The shaking massage segment 11 hits the inner cavity 30 of the recovery pad 3, and causes the recovery pad 3 to vibrate, thereby massaging the kinked part of the stent 6. Then, when the first stopper 21 contacts the distal end of the recovery pad 3, the operator drives the guide wire 1 to move distally, and the massage segment 11 moves distally through the inner cavity 30 of the recovery pad 3. During the movement of the massage segment 11 toward the distal end, the massage segment 11 vibrates, and the vibrating massage segment 11 strikes the inner cavity 30 of the recovery pad 3, causing the recovery pad 3 to vibrate and massage the kinked portion of the stent 6. The operator can drive the massage segment 11 to move distally or proximally to cause the recovery pad 3 to massage the kinked portion of the stent 6, so that the kinked portion of the stent 6 is transformed into an open state.

[0068] Compared with the prior art, in this embodiment, when the stent 6 is kinked in the microcatheter 5, that is, the two ends of the stent 6 are open but the middle is not open, the operator does not need to recover and release the stent 6 again, which shortens the operation time, reduces damage to the inner wall of the blood vessel, and reduces the risk of acute thrombosis. During the delivery of the stent 6, the operator only needs to repeatedly push the guide wire 1 to drive the massage segment 11 to move proximally and push the guide wire 1 to drive the massage segment 11 to move distally. This can cause the massage segment 11 to shake, and the shaking massage segment 11 hits the inner cavity 30 of the recovery pad 3, and causes the recovery pad 3 to vibrate, thereby massaging the position where the stent 6 is kinked, so that the position where the stent 6 is kinked is transformed into an open state.

[0069] Through the coordination of the push mechanism disclosed in this embodiment and the microcatheter 5, during the implantation of the stent 6, the stent 6 in the open state is further adhered to the inner wall of the blood vessel after being released into the blood vessel, reducing the risk of the stent 6 failing to open. There is no need to subsequently expand the stent 6 at the location where the kink occurred using a balloon catheter or massage the stent 6 at the location where the kink occurred using a microguidewire, thereby reducing surgical time and saving the patient's surgical costs. The push mechanism of this embodiment can massage the stent 6 during the release process of the stent 6 to promote the opening of the kink of the stent 6. This configuration avoids the need to recycle and release the stent 6.

[0070] Second embodiment

[0071] The inventors have found that if the push guide wire 1 has a thicker diameter, the push guide wire 1 may not be suitable for tortuous blood vessels. However, if the push guide wire 1 has a thinner diameter, the delivery capacity of the push guide wire 1 may be reduced.

[0072] In view of this, this embodiment also proposes a pushing mechanism. The second embodiment is a further improvement based on the first embodiment, and the main improvement lies in the structure of the pushing guide wire 1. The specific solution is as follows:

[0073] Optional, such as Figure 6 As shown, the push guide wire 1 includes a main body section 13, a reduced diameter section 14, and a massage section 11, which are integrally formed. The wire diameter of the massage section 11 is smaller than that of the main body section 13, that is, the main body section 13 is thicker than the massage section 11. The wire diameter of the reduced diameter section 14 near the proximal end is the same as that of the main body section 13, which facilitates the fixed connection between the distal end of the main body section 13 and the proximal end of the reduced diameter section 14. The wire diameter of the reduced diameter section 14 near the distal end is the same as that of the massage section 11, which facilitates the fixed connection between the distal end of the reduced diameter section 14 and the proximal end of the massage section 11. The wire diameter of the reduced diameter section 14 gradually decreases from the proximal end to the distal end, and the reduced diameter section 14 can serve as a transition between the wire diameters of the main body section 13 and the massage section 11. Such a setting can ensure that the pushing mechanism has sufficient structural strength, making it easier for the pushing mechanism to transport the stent 6 to a more distal position in the blood vessel, and setting the recovery pad 3 on the massage section 11 is more suitable for tortuous blood vessels.

[0074] Optional, such as Figure 6 As shown, based on the above-mentioned optional technical solution, a distal spring 12 is provided at the distal end of the massage segment 11. One end of the distal spring 12 is fixedly connected to the distal end of the massage segment 11, and the other end of the distal spring 12 is provided with a round head. This arrangement not only ensures the structural strength of the pushing mechanism, but also prevents damage to the inner wall of the blood vessel during the delivery of the stent 6.

[0075] Optional, such as Figure 3 As shown, the pushing mechanism also includes a reinforcing spring 15, which is sleeved on the reduced diameter section 14. One end of the reinforcing spring 15 abuts against the proximal end of the reduced diameter section 14, and the other end of the reinforcing spring 15 abuts against the second stopper 22. By sleeved on the reduced diameter section 14, the structural strength of the reduced diameter section 14 is further enhanced. Simultaneously, the second stopper 22 also serves to limit the reinforcing spring 15.

[0076] Third embodiment

[0077] The inventors have found that although the pushing mechanism in the first or second embodiment can open the kinked portion of the bracket 6 , the operator needs to drive the massage section 11 to move distally or proximally multiple times, which takes a long time.

[0078] In view of this, this embodiment also proposes a pushing mechanism. The third embodiment is a further improvement based on the first embodiment or the second embodiment, and the main improvement lies in the structure of the massage section 11. The specific solution is as follows:

[0079] Optional, such as Figure 7 、 Figure 8 As shown, the massage segment 11 has a wavy structure. Specifically, the structure of the massage segment 11 includes a crest sub-segment and a trough sub-segment. The value obtained by adding the absolute value of the height H of the crest sub-segment and the absolute value of the height h of the trough sub-segment is the outer diameter of the massage segment 11. The outer diameter of the massage segment 11 is greater than the inner diameter of the recovery pad 3, and the outer diameter of the massage segment 11 is smaller than the outer diameter of the recovery pad 3. When the recovery pad 3 is sleeved on the massage segment 11, the portion of the massage segment 11 located in the inner cavity 30 undergoes elastic deformation inward, and the outer diameter of the portion of the massage segment 11 located in the inner cavity 30 is smaller than the inner diameter of the recovery pad 3. The portion of the massage segment 11 located outside the inner cavity 30 does not undergo elastic deformation. The outer diameter of the portion of the massage segment 11 located outside the inner cavity 30 is greater than the inner diameter of the recovery pad 3, and smaller than the outer diameter of the recovery pad 3. When the operator massages the kinked part of the bracket 6, specifically, in the process of the massage segment 11 moving proximally and in the process of the massage segment 11 moving distally, the principle of the wavy structure massage segment 11 passing through the inner cavity 30 of the recovery pad 3 is the same, so the operator drives the push guide wire 1 to move proximally as an example for introduction. The operator drives the push guide wire 1 to move proximally. Due to the constraint of the recovery pad 3, and as the massage segment 11 passes through the inner cavity 30 of the recovery pad 3 and moves proximally, the outer diameter of the portion of the massage segment 11 that has not yet entered the inner cavity 30 remains unchanged. The portion of the massage segment 11 that enters the inner cavity 30 undergoes elastic deformation, and the outer diameter of the portion of the massage segment 11 that enters the inner cavity 30 is smaller than the inner diameter of the recovery pad 3. The outer diameter of the portion of the massage segment 11 that is freed from the constraint of the recovery pad 3 returns to its original state. During the process of the massage segment 11 moving toward the proximal end, the wavy structure of the massage segment 11 will increase the vibration amplitude of the massage segment 11, thereby increasing the force of the massage segment 11 hitting the inner cavity 30 of the recovery pad 3, enhancing the massage effect of the recovery pad 3 on the kink of the bracket 6, and shortening the massage time.

[0080] Optional, such as Figure 4 、 Figure 5 、 Figure 9As shown, the massage segment 11 has a spiral structure, and its outer diameter is larger than the inner diameter of the recovery pad 3, but smaller than the outer diameter of the recovery pad 3. When the recovery pad 3 is placed over the massage segment 11, the portion of the massage segment 11 located within the inner cavity 30 undergoes elastic deformation inward, and the outer diameter of the portion of the massage segment 11 located within the inner cavity 30 is smaller than the inner diameter of the recovery pad 3. However, the portion of the massage segment 11 located outside the inner cavity 30 does not undergo elastic deformation, and its outer diameter is larger than the inner diameter of the recovery pad 3, but smaller than the outer diameter of the recovery pad 3. When the operator massages the kinked part of the bracket 6, specifically, in the process of the massage segment 11 moving proximally and in the process of the massage segment 11 moving distally, the principle of the spirally structured massage segment 11 passing through the inner cavity 30 of the recovery pad 3 is the same, so the operator driving the push guide wire 1 to move proximally is used as an example for introduction. The operator drives the push guide wire 1 to move proximally. Due to the constraint of the recovery pad 3, and as the massage segment 11 passes through the inner cavity 30 of the recovery pad 3 and moves proximally, the outer diameter of the portion of the massage segment 11 that has not yet entered the inner cavity 30 remains unchanged. The portion of the massage segment 11 that enters the inner cavity 30 undergoes elastic deformation, and the outer diameter of the portion of the massage segment 11 that enters the inner cavity 30 is smaller than the inner diameter of the recovery pad 3. The outer diameter of the portion of the massage segment 11 that is freed from the constraint of the recovery pad 3 returns to its original state. As the massage segment 11 moves toward the proximal end, its helical structure increases the vibration amplitude of the massage segment 11. This not only increases the force with which the massage segment 11 strikes the inner cavity 30 of the recovery pad 3, but also further enhances the massage effect of the recovery pad 3 on the kink of the bracket 6, shortening the massage time. The difference between the helical massage segment 11 and the wavy massage segment 11 is that the helical massage segment 11 strikes a wider range within the inner cavity 30 of the recovery pad 3.

[0081] Optional, such as Figure 4 、 Figure 5 、 Figure 10As shown, the massage segment 11 is in the shape of a variable diameter spiral. Specifically, the outer diameter of the massage segment 11 gradually increases and then gradually decreases from the direction of the proximal end toward the direction of the distal end. That is, the outer diameter of the middle portion of the massage segment 11 is the largest, and the outer diameter of the middle portion of the massage segment 11 is larger than the outer diameters at both ends of the massage segment 11. The outer diameter of the middle portion of the massage segment 11 and the outer diameters of the two ends of the massage segment 11 are both larger than the inner diameter of the recovery pad 3, and smaller than the outer diameter of the recovery pad 3. When the recovery pad 3 is sleeved on the massage segment 11, the portion of the massage segment 11 located within the inner cavity 30 undergoes elastic deformation inward, and the outer diameter of the portion of the massage segment 11 located within the inner cavity 30 is smaller than the inner diameter of the recovery pad 3. However, the other portion of the massage segment 11 located outside the inner cavity 30 does not undergo elastic deformation. The outer diameter of the other portion of the massage segment 11 located outside the inner cavity 30 is larger than the inner diameter of the recovery pad 3, and smaller than the outer diameter of the recovery pad 3. When the operator massages the kinked part of the bracket 6, specifically, in the process of the massage segment 11 moving toward the proximal end and the process of the massage segment 11 moving toward the distal end, the principle of the variable diameter spiral massage segment 11 passing through the inner cavity 30 of the recovery pad 3 is the same, so the operator drives the push guide wire 1 to move toward the proximal end as an example for introduction. The operator drives the push guide wire 1 to move toward the proximal end. Due to the constraint of the recovery pad 3, and as the massage segment 11 passes through the inner cavity 30 of the recovery pad 3 toward the proximal end, the outer diameter of the portion of the massage segment 11 that has not yet entered the inner cavity 30 remains unchanged. The portion of the massage segment 11 that enters the inner cavity 30 undergoes elastic deformation, and the outer diameter of the portion of the massage segment 11 that enters the inner cavity 30 is smaller than the inner diameter of the recovery pad 3. The outer diameter of the portion of the massage segment 11 that is freed from the constraint of the recovery pad 3 returns to its original state. In the process of the massage segment 11 moving toward the proximal end, since the outer diameter of the middle part of the massage segment 11 and the outer diameters at both ends of the massage segment 11 are greater than the inner diameter of the recovery pad 3, and the outer diameter of the middle part of the massage segment 11 is greater than the outer diameters at both ends of the massage segment 11, the shaking amplitude of the massage segment 11 will be further increased when the middle part of the massage segment 11 passes through the inner cavity 30, which not only increases the force of the massage segment 11 hitting the inner cavity 30 of the recovery pad 3, but also enhances the massage effect of the recovery pad 3 on the kink of the bracket 6, shortening the massage time.

[0082] Optional, such as Figure 4 、 Figure 5 、 Figure 11 、 Figure 12As shown, the middle portion of the massage segment 11 is in the shape of a mesh tube. Specifically, a plurality of braided wires are woven into a mesh tube-like structure, i.e., the middle portion of the massage segment 11. The length of the middle portion of the massage segment 11 is longer than the length of the recovery pad 3. The ends of the plurality of braided wires located at both ends of the mesh tube-like structure are respectively braided and connected to form a single wire, i.e., the two ends of the massage segment 11. The outer diameter of the middle portion of the massage segment 11 is the largest, the outer diameter of the middle portion of the massage segment 11 is greater than the inner diameter of the recovery pad 3, and the outer diameter of the middle portion of the massage segment 11 is smaller than the outer diameter of the recovery pad 3. The outer diameters of the two ends of the massage segment 11 are smaller than the outer diameter of the middle portion, and the outer diameters of the two ends of the massage segment 11 are smaller than the inner diameter of the recovery pad 3. When the recovery pad 3 is sleeved on the massage segment 11, the outer diameters of the two ends of the massage segment 11 remain fixed. When the recovery pad 3 is sleeved on the massage segment 11 and positioned at the proximal end of the massage segment 11, the outer diameter of the proximal end of the massage segment 11 remains unchanged, while the central portion of the massage segment 11 located within the inner cavity 30 undergoes elastic deformation inward, and the outer diameter of the central portion of the massage segment 11 located within the inner cavity 30 is smaller than the inner diameter of the recovery pad 3. However, the remaining central portion of the massage segment 11 located outside the inner cavity 30 does not undergo elastic deformation, and the outer diameter of the remaining central portion of the massage segment 11 located outside the inner cavity 30 is larger than the inner diameter of the recovery pad 3, but smaller than the outer diameter of the recovery pad 3. When the operator massages the kinked part of the bracket 6, specifically, in the process of the massage segment 11 moving toward the proximal end and the process of the massage segment 11 moving toward the distal end, the principle of the massage segment 11 with a mesh tube shape in the middle passing through the inner cavity 30 of the recovery pad 3 is the same, so the operator is driving the push guide wire 1 to move toward the proximal end as an example for introduction. The operator drives the push guide wire 1 to move toward the proximal end. Due to the constraint of the recovery pad 3, and as the massage segment 11 passes through the inner cavity 30 of the recovery pad 3 and moves toward the proximal end, the outer diameter of the middle part of the massage segment 11 that has not yet entered the inner cavity 30 remains unchanged. The middle part of the massage segment 11 that enters the inner cavity 30 undergoes elastic deformation, and the outer diameter of the middle part of the massage segment 11 that enters the inner cavity 30 is smaller than the inner diameter of the recovery pad 3. The outer diameter of the middle part of the massage segment 11 that is freed from the constraint of the recovery pad 3 returns to its original state. During the proximal movement of the massage segment 11, when the recovery pad 3 is located in the middle of the mesh tube structure, both ends of the mesh tube structure remain in an expanded state. Due to the restraint of the recovery pad 3 on the middle of the mesh tube structure, the ends of the mesh tube structure undergo elastic deformation, and the outer diameters of the ends of the mesh tube structure become smaller than their original outer diameters. Since the middle of the massage segment 11 is a mesh tube structure, when the massage segment 11 passes through the inner cavity 30 of the recovery pad 3, the vibration amplitude of the massage segment 11 and the force with which the massage segment 11 strikes the inner cavity 30 of the recovery pad 3 are improved, resulting in the recovery pad 3 exerting a peristaltic massage effect on the kinked portion of the support 6.

[0083] You can choose any one of the four optional technical solutions mentioned above.

[0084] Fourth embodiment

[0085] This embodiment also proposes a pushing mechanism. The fourth embodiment is a further improvement based on any one of the first to third embodiments, and the main improvement lies in the structure of the recovery pad 3. The specific solution is as follows:

[0086] like Figure 13 、 Figure 14 As shown, the recovery pad 3 has a plurality of adjustment holes 32. In this embodiment, the depth of the adjustment holes 32 is set as follows:

[0087] Optional, such as Figure 13 As shown, the multiple adjustment holes 32 on the recovery pad 3 are all connected to the inner cavity 30 of the recovery pad 3 , that is, the inner cavity 30 of the recovery pad 3 is connected to the outside through the adjustment holes 32 .

[0088] Optional, such as Figure 14 As shown, the multiple adjustment holes 32 on the recovery pad 3 are not connected to the inner cavity 30 of the recovery pad 3, that is, the inner cavity 30 of the recovery pad 3 cannot be connected to the outside through the adjustment holes 32.

[0089] Optionally, not shown in the figure, based on the optional technical solution that multiple adjustment holes 32 are not connected to the inner cavity 30 of the recovery pad 3, the depth of the adjustment hole 32 is 1 / 20 to 19 / 20 of the thickness of the tube wall of the recovery pad 3.

[0090] You can choose any one of the three optional technical solutions mentioned above.

[0091] On the basis of the above three optional technical solutions, in this embodiment, the shape and distribution of the adjustment holes 32 are further improved. The improvements are:

[0092] Optional, such as Figure 15 、 Figure 16 As shown, the recovery pad 3 has multiple groups of adjustment holes 32, and the multiple groups of adjustment holes 32 are evenly distributed around the axis of the recovery pad 3. Each group of adjustment holes 32 includes multiple adjustment holes 32, and the multiple adjustment holes 32 are all in the shape of long strips. Specifically, the adjustment holes 32 in the shape of long strips surround the axis of the recovery pad 3 and are arranged on the outer wall of the recovery pad 3, that is, the recovery pad 3 can be regarded as having adjustment holes 32 in the circumferential direction. Of course, it can also be regarded as the length direction of the adjustment holes 32 being perpendicular to the axis direction of the recovery pad 3. In order to facilitate the understanding of the present technical solution, two groups of adjustment holes 32 are taken as an example for introduction, and the multiple adjustment holes 32 are divided into two groups of adjustment holes 32, wherein one group of adjustment holes 32 is located on one side of the axis of the recovery pad 3, and the other group of adjustment holes 32 is located on the other side of the axis of the recovery pad 3. The lengths of the two groups of adjustment holes 32 are the same, that is, the two groups of adjustment holes 32 are evenly distributed around the axis of the recovery pad 3. Both groups of adjustment holes 32 include multiple adjustment holes 32. As Figure 15As shown, when the number of adjustment holes 32 in the two groups of adjustment holes 32 is the same, the multiple adjustment holes 32 in one group of adjustment holes 32 are sequentially spaced along the axial direction of the recovery pad 3, and the multiple adjustment holes 32 in the other group of adjustment holes 32 are sequentially spaced along the axial direction of the recovery pad 3, and the two groups of adjustment holes 32 are symmetrically arranged. Not shown in the figure, when the number of adjustment holes 32 in the two groups of adjustment holes 32 is different, the number of adjustment holes 32 in one group is one less than the number of adjustment holes 32 in the other group, and the multiple adjustment holes 32 in the smaller group of adjustment holes 32 are sequentially spaced along the axial direction of the recovery pad 3, and the multiple adjustment holes 32 in the larger group of adjustment holes 32 are sequentially spaced along the axial direction of the recovery pad 3, and the two groups of adjustment holes 32 are staggered. Such an arrangement is conducive to the elastic deformation of the recovery pad 3.

[0093] Optional, such as Figure 17 As shown, the recovery pad 3 is provided with a group of adjustment holes 32, which includes multiple adjustment holes 32. The multiple adjustment holes 32 are all in the shape of elongated strips. Specifically, the multiple adjustment holes 32 are evenly distributed around the axis of the recovery pad 3, and the length direction of the adjustment holes 32 is parallel to the axis direction of the recovery pad 3. Of course, it can also be regarded as the adjustment holes 32 are provided in the axial direction of the recovery pad 3. Such an arrangement is more conducive to the elastic deformation of the recovery pad 3.

[0094] Optional, such as Figure 18 As shown, the recovery pad 3 is provided with multiple groups of adjustment holes 32, and the multiple groups of adjustment holes 32 are arranged in sequence at intervals along the axial direction of the recovery pad 3. Each group of adjustment holes 32 includes multiple adjustment holes 32, and the multiple adjustment holes 32 are all in the shape of elongated strips. Specifically, the multiple adjustment holes 32 are evenly distributed around the axis of the recovery pad 3, and the length direction of the adjustment holes 32 is parallel to the axial direction of the recovery pad 3. Of course, it can also be regarded as that the recovery pad 3 is axially provided with adjustment holes 32. In this technical solution, two adjacent groups of adjustment holes 32 are staggered, or two adjacent groups of adjustment holes 32 are symmetrically arranged. Such an arrangement is more conducive to the elastic deformation of the recovery pad 3.

[0095] Optional, such as Figure 19 、 Figure 20 As shown, the recovery pad 3 is provided with multiple groups of adjustment holes 32, and the multiple groups of adjustment holes 32 are arranged in sequence along the axial direction of the recovery pad 3. Each group of adjustment holes 32 includes multiple adjustment holes 32, and the adjustment holes 32 can be circular holes. Specifically, the multiple adjustment holes 32 are evenly distributed around the axis of the recovery pad 3. In this technical solution, two adjacent groups of adjustment holes 32 are symmetrically arranged, or two adjacent groups of adjustment holes 32 are staggered. Using circular holes as the adjustment holes 32 of the recovery pad 3 facilitates the processing of the recovery pad 3 and enhances the stability of the structure of the recovery pad 3.

[0096] Optional, such as Figure 19 、 Figure 20As shown, the recovery pad 3 is provided with multiple groups of adjustment holes 32, and the multiple groups of adjustment holes 32 are arranged in sequence along the axial direction of the recovery pad 3. Each group of adjustment holes 32 includes multiple adjustment holes 32, and the adjustment holes 32 can be triangular holes. Specifically, the multiple adjustment holes 32 are evenly distributed around the axis of the recovery pad 3. In this technical solution, two adjacent groups of adjustment holes 32 are symmetrically arranged, or two adjacent groups of adjustment holes 32 are staggered. Using triangular holes as the adjustment holes 32 of the recovery pad 3 enhances the stability of the recovery pad 3 structure.

[0097] Optional, such as Figure 20 、 Figure 21 As shown, the recovery pad 3 is provided with multiple groups of adjustment holes 32, and the multiple groups of adjustment holes 32 are arranged in sequence along the axial direction of the recovery pad 3. Each group of adjustment holes 32 includes multiple adjustment holes 32, and the adjustment holes 32 can be diamond-shaped holes. Specifically, the multiple adjustment holes 32 are evenly distributed around the axis of the recovery pad 3. In this technical solution, two adjacent groups of adjustment holes 32 are symmetrically arranged, or two adjacent groups of adjustment holes 32 are staggered. Using diamond-shaped holes as the adjustment holes 32 of the recovery pad 3 is conducive to the elastic deformation of the recovery pad 3.

[0098] You can choose any one of the above six optional technical solutions.

[0099] Compared to the prior art, in this embodiment, by providing an adjustment hole 32 on the recovery pad 3 and utilizing the synergistic cooperation of the technical feature of the depth of the adjustment hole 32 and the technical feature of the shape of the adjustment hole 32, not only the friction of the recovery pad 3 is increased, but also the elastic deformation performance of the recovery pad 3 is enhanced. In the process of releasing the stent 6 or recovering the stent 6, the length of the recovery pad 3 with the adjustment hole 32 becomes shorter, and the outer diameter of the recovery pad 3 increases. When the recovery pad 3 with an increased outer diameter cooperates with the microcatheter 5 and clamps the stent 6, the stent 6 can be further prevented from being unloaded. Such a setting improves the adaptive deformation ability of the recovery pad 3, and the recovery pad 3 can be better bent and deformed, and is more suitable for tortuous intracranial blood vessels.

[0100] Fifth embodiment

[0101] The fifth embodiment is a further improvement based on the fourth embodiment. The main improvement is that a colloid 4 is provided in the adjustment hole 32. The specific solution is as follows:

[0102] Optionally, not shown in the figures, colloid 4 is provided in all the adjustment holes 32 on the recovery pad 3 .

[0103] Optional, such as Figure 15 、 Figure 19As shown, a portion of the adjustment holes 32 on the recovery pad 3 is provided with colloid 4. Specifically, the plurality of adjustment holes 32 located on one side of the axis of the recovery pad 3 are all provided with colloid 4, and the plurality of adjustment holes 32 located on the other side of the axis of the recovery pad 3 are not provided with colloid 4.

[0104] Optional, such as Figure 19 As shown, colloid 4 is provided in a portion of the adjustment holes 32 on the recovery pad 3. Specifically, colloid 4 is provided in the plurality of adjustment holes 32 at one end of the recovery pad 3, and colloid 4 is not provided in the plurality of adjustment holes 32 at the other end of the recovery pad 3.

[0105] Optional, such as Figure 20 As shown, a portion of the adjustment holes 32 on the recovery pad 3 is provided with a colloid 4. Specifically, a plurality of groups of adjustment holes 32 are arranged in sequence along the axial direction of the recovery pad 3. Each group of adjustment holes 32 includes a plurality of adjustment holes 32, and the plurality of adjustment holes 32 are evenly distributed around the axis of the recovery pad 3. Preferably, in each group of adjustment holes 32, the number of adjustment holes 32 is an even number, and one of the two adjacent adjustment holes 32 is provided with a colloid 4, while the other adjustment hole 32 is not provided with a colloid 4. In the two adjacent groups of adjustment holes 32, the colloids 4 located in the two groups of adjustment holes 32 are symmetrically arranged, or the colloids 4 located in the two groups of adjustment holes 32 are staggered.

[0106] You can choose any one of the four optional technical solutions mentioned above.

[0107] In this embodiment, the colloid 4 can be made of any one of epoxy resin, acrylate, silicone, and polyurethane materials. Alternatively, a mixture of multiple of these materials can be used. For example, the colloid 4 can be prepared by injecting epoxy resin glue, acrylate glue, silicone glue, or polyurethane glue into the adjustment hole 32, and then cooling the glue to form the colloid 4. Since the preparation method of the colloid 4 is conventional, it will not be described in detail here.

[0108] In order to further improve the massage strength of the recovery pad 3, the colloid 4 in the adjustment hole 32 is further improved as follows:

[0109] Optional, such as Figure 22 As shown, the wall of the adjustment hole 32 has a positioning groove 33, which is arranged in a circle around the axis of the adjustment hole 32. The colloid 4 has a positioning protrusion 41 that matches the positioning groove 33. With the positioning protrusion 41 positioned within the positioning groove 33, the colloid 4 is connected to the recovery pad 3 by a snap-fit ​​connection. This arrangement prevents the colloid 4 from slipping out of the adjustment hole 32 of the recovery pad 3, thereby strengthening the connection between the colloid 4 and the recovery pad 3.

[0110] Optional, such as Figure 22 、 Figure 23 As shown, the end of the adjustment hole 32 near the inner cavity 30 of the recovery pad 3 has a chamfer 34, and the end of the colloid 4 near the inner cavity 30 has an edge 42 that matches the chamfer 34. When the colloid 4 is placed in the adjustment hole 32, the edge 42 contacts the chamfer 34, thereby achieving the chamfer 34 to limit the colloid 4. This arrangement prevents the colloid 4 from slipping out of the adjustment hole 32 of the recovery pad 3 and strengthens the connection strength between the colloid 4 and the recovery pad 3.

[0111] Optional, such as Figure 22 、 Figure 23 As shown, the technical solution of providing the adjustment hole 32 with a chamfer 34 can also be combined with the above two technical solutions of providing the positioning groove 33 in the adjustment hole 32 to further strengthen the connection strength between the colloid 4 and the recovery pad 3.

[0112] Optional, such as Figure 22 、 Figure 23 As shown, based on the above three optional technical solutions, the height of the colloid 4 is the same as the depth of the adjustment hole 32. In this technical solution, the five technical features of the height of the colloid 4 being the same as the depth of the adjustment hole 32, the shape of the adjustment hole 32, the colloid 4 being disposed within a portion of the adjustment hole 32 on the recovery pad 3, the material of the colloid 4, and the height of the colloid 4 are combined to increase the hardness of the recovery pad 3, reduce the elastic deformation performance of the recovery pad 3, and ensure the original friction of the recovery pad 3.

[0113] Optional, such as Figure 22 、 Figure 23 As shown, the difference from the above technical solution is that the height of the colloid 4 is less than the depth of the adjustment hole 32. In this technical solution, through the combined cooperation of five technical features: the height of the colloid 4 is less than the depth of the adjustment hole 32; the shape of the adjustment hole 32; the colloid 4 is disposed in a portion of the adjustment hole 32 on the recovery pad 3; the material of the colloid 4; and the height of the colloid 4, the hardness of the recovery pad 3 is further reduced, the elastic deformation performance of the recovery pad 3 is improved, and the friction of the recovery pad 3 is further enhanced, thereby preventing the bracket 6 from becoming unloaded during transportation.

[0114] Optional, such as Figure 22 、 Figure 23 As shown, the difference from the above-mentioned technical solution is that the height of the colloid 4 is 0.1mm to 1mm higher than the depth of the adjustment hole 32, forming a massage protrusion. In this technical solution, the five technical features of the colloid 4 being higher than the depth of the adjustment hole 32 and forming the massage protrusion, the shape of the adjustment hole 32, the colloid 4 being disposed within a portion of the adjustment hole 32 on the recovery pad 3, the material of the colloid 4, and the height of the colloid 4 further enhance the friction of the recovery pad 3 and improve the massage effect of the recovery pad 3.

[0115] Optional, such as Figure 23 As shown, the difference from the above technical solution is that the height of the colloid gradually decreases from the direction of the distal end to the direction of the proximal end. For example, the height of the colloid near the distal end is 0.1mm to 1mm higher than the depth of the adjustment hole 32, the height of the colloid located in the middle of the recovery pad is the same as the height of the adjustment hole, and the height of the colloid 4 near the proximal end is less than the depth of the adjustment hole 32. In this technical solution, the friction of the recovery pad 3 is further enhanced and the massage effect of the recovery pad 3 is improved by the combined efforts of the five technical features of the height of the colloid gradually decreasing from the direction of the distal end to the direction of the proximal end, the shape of the adjustment hole 32, the colloid 4 being provided in a part of the adjustment hole 32 on the recovery pad 3, the material of the colloid 4 and the height of the colloid 4.

[0116] You can choose any one of the seven optional technical solutions mentioned above.

[0117] Sixth embodiment

[0118] This embodiment proposes a stent delivery system. The stent delivery system disclosed in this embodiment includes the pushing mechanism of any one of the first to fifth embodiments. The specific scheme is as follows:

[0119] like Figure 3 、 Figure 5 As shown, the stent delivery system also includes a microcatheter 5, which has a lumen 51 therein. One end of the pushing mechanism provided with a massage section 11 can enter the lumen 51 of the microcatheter 5, and move toward the proximal end or the distal end in the lumen 51, thereby achieving the delivery of the stent 6. Specifically, the stent 6 is first sleeved on the pushing mechanism and positioned at the recovery pad 3, and then the stent 6 and the pushing mechanism are placed together in the lumen 51 of the microcatheter 5. At this time, the stent 6 is in a compressed state. The friction between the pushing mechanism, the stent 6 and the microcatheter 5 is utilized to deliver the stent 6. The end of the pushing mechanism provided with the massage section 11 is moved toward the distal end in the lumen 51, thereby achieving the release of the stent 6. The end of the pushing mechanism provided with the massage section 11 is moved toward the proximal end in the lumen 51, thereby achieving the recovery of the stent 6.

[0120] Finally, it should be noted that those skilled in the art will appreciate that the embodiments of the present invention provide numerous technical details to facilitate a better understanding of the present invention. However, even without these technical details and the various variations and modifications based on the aforementioned embodiments, the technical solutions claimed in the various claims of the present invention can be substantially achieved. Therefore, in actual practice, various modifications may be made to the aforementioned embodiments in form and detail without departing from the spirit and scope of the present invention.

Claims

1. A pushing mechanism, characterized in that: include: A guide wire is pushed, and the distal end thereof has a massage section; The first limiting member and the second limiting member are respectively provided at the two ends of the massage section; the first limiting member and the second limiting member are fixedly connected to the pushing guide wire; A recovery pad is sleeved on the massage section and located between the first limiter and the second limiter; the length of the recovery pad is shorter than the length of the massage section; the outer diameter of the first limiter is the same as the outer diameter of the second limiter, the inner diameter of the recovery pad is smaller than the outer diameter of the first limiter, and the outer diameter of the recovery pad is larger than the outer diameter of the first limiter; the recovery pad can move toward the distal end or the proximal end along the length direction of the push guide wire; When in use, the massage section is driven to move toward the distal end or the proximal end by pushing the guide wire. The massage section vibrates during the movement, and the recovery pad vibrates to massage the kink of the bracket so as to open the kink.

2. The pushing mechanism according to claim 1, characterized in that: The massage section is wavy or spiral; When the recovery pad is sleeved on the massage section, a portion of the massage section is deformed and located inside the recovery pad; the outer diameter of another portion of the massage section located outside the recovery pad is larger than the inner diameter of the recovery pad and smaller than the outer diameter of the recovery pad.

3. The pushing mechanism according to claim 1, characterized in that: The massage section is in the shape of a variable diameter spiral; When the recovery pad is sleeved on the massage section, a portion of the massage section is deformed and located inside the recovery pad; the outer diameter of another portion of the massage section located outside the recovery pad is larger than the inner diameter of the recovery pad and smaller than the outer diameter of the recovery pad.

4. The pushing mechanism according to claim 1, characterized in that: The middle part of the massage section is in the shape of a mesh tube; When the recovery pad is sleeved on the massage section, a portion of the massage section is deformed and located inside the recovery pad; the outer diameter of another portion of the massage section located outside the recovery pad is larger than the inner diameter of the recovery pad and smaller than the outer diameter of the recovery pad.

5. The pushing mechanism according to any one of claims 1 to 4, characterized in that: The pushing guide wire also includes: The main body section has one end connected to the massage section through a reduced diameter section; the wire diameter of the massage section is smaller than the wire diameter of the main body section; the wire diameter of the reduced diameter section near the proximal end is the same as the wire diameter of the main body section, and the wire diameter of the reduced diameter section near the distal end is the same as the wire diameter of the massage section, and the wire diameter of the reduced diameter section gradually decreases from the proximal end to the distal end; a distal spring is provided at one end of the massage section near the distal end.

6. The pushing mechanism according to claim 1, characterized in that: The recovery pad is provided with an adjustment hole; The adjustment hole is in communication with the inner cavity of the recovery pad; or the adjustment hole is not in communication with the inner cavity of the recovery pad; When the adjustment hole is not connected to the inner cavity of the recovery pad, the depth of the adjustment hole is 1 / 20 to 19 / 20 of the thickness of the recovery pad tube wall.

7. The pushing mechanism according to claim 6, characterized in that: The recovery pad is provided with an elongated adjustment hole on its circumference; There are two groups of adjustment holes, one group of adjustment holes is located on one side of the recovery pad, and the other group of adjustment holes is located on the other side of the recovery pad. The two groups of adjustment holes are symmetrically arranged or staggered. Each group of adjustment holes includes a plurality of adjustment holes, and the plurality of adjustment holes are sequentially spaced apart along the axial direction of the recovery pad.

8. The pushing mechanism according to claim 6, characterized in that: The recovery pad is provided with a long strip-shaped adjustment hole in the axial direction; The number of the adjustment holes is one group or multiple groups. When the number of the adjustment holes is multiple groups, the multiple groups of adjustment holes are sequentially spaced along the axis direction of the recovery pad, and two adjacent groups of adjustment holes are symmetrically arranged or staggered. Each group of adjustment holes includes a plurality of adjustment holes, and the plurality of adjustment holes are arranged around the axis of the recovery pad.

9. The pushing mechanism according to claim 6, characterized in that: The adjustment hole is a circular hole, a diamond hole or a triangular hole; There are multiple groups of adjustment holes, and the multiple groups of adjustment holes are sequentially spaced along the axis direction of the recovery pad, and two adjacent groups of adjustment holes are symmetrically arranged or staggered; Each group of adjustment holes includes a plurality of adjustment holes, and the plurality of adjustment holes are arranged around the axis of the recovery pad.

10. The pushing mechanism according to any one of claims 6 to 9, characterized in that: Colloid is provided in all or part of the regulating holes; The colloid is formed by mixing any one or more of epoxy resin, acrylate, silica gel and polyurethane.

11. The pushing mechanism according to claim 10, characterized in that: The height of the colloid is the same as the depth of the adjustment hole; or, the height of the colloid is less than the depth of the adjustment hole; or, the height of the colloid is 0.1 mm to 1 mm higher than the depth of the adjustment hole.

12. The pushing mechanism according to claim 10, characterized in that: A positioning groove is provided in the adjustment hole, and a positioning protrusion is provided on the colloid that matches the positioning groove. When the positioning protrusion is set in the positioning groove, the colloid is engaged with the recovery pad; and / or, One end of the regulating hole close to the inner cavity is provided with a chamfer, and one end of the colloid close to the inner cavity is provided with an edge adapted to the chamfer. When the edge collides with the chamfer, the chamfer acts as a limit for the colloid.

13. A stent delivery system, characterized in that: include: The pushing mechanism according to any one of claims 1 to 12; the pushing mechanism is slidably disposed in the lumen of the microcatheter.

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