Connecting mechanism and stent conveying device

Abstract

The invention discloses a connecting mechanism and a stent conveying device. The connecting mechanism comprises a positioning pipe and a connecting rod, the locking wire is arranged in the positioning pipe; the positioning pipe and the locking wire are independently conveyed respectively; the connecting component comprises a connecting component body and a positioning bulge; the positioning bulge and the far end part of the locking wire are connected in a clamping manner, are inserted into the positioning pipe and are radially restrained by the positioning pipe; when the stent is conveyed, the positioning pipe and the locking wire synchronously move towards the far end to convey the connecting component and the stent together; when the stent is released, the positioning pipe retracts to be separated from the connecting area of the positioning protrusion and the far end of the locking wire, the locking wire moves relative to the connecting component, and the locking wire is separated from the connecting component. The positioning pipe and the locking wire are arranged in an independent conveying mode, the part, connected with the connecting component in a clamped mode, of the locking wire is arranged in the positioning pipe, and therefore even if the positioning pipe rotates relative to the connecting component, the problem that the locking wire winds the positioning pipe cannot occur.

Description

Technical Field

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

[0002] The heart valve delivery and replacement device is used to deliver the heart valve prosthesis to the target location, replace the diseased heart valve with the heart valve prosthesis, and restore heart function. The existing heart valve delivery and replacement device mainly includes a delivery device and a heart valve prosthesis, and whether the heart valve prosthesis can be accurately placed in the target area depends on the connection and release mechanism of the delivery device and the heart valve prosthesis.

[0003] The current conveying device is mainly realized by connecting locking wires, positioning tubes and connecting components. The specific connection method is that a through hole is opened on the distal side wall of the positioning tube, a positioning protrusion is provided on the connecting component, and the positioning protrusion is provided with a through hole. The positioning protrusion is inserted into the distal end of the connecting component, so that the through hole of the positioning tube is aligned with the through hole of the positioning protrusion, and then the locking wire is passed through the two through holes to realize the connection between the positioning tube and the connecting component.

[0004] When releasing the heart valve prosthesis, the positioning tube is fixed, the locking wire is pulled back, and then the connection between the positioning tube and the positioning protrusion is removed, and finally the positioning tube is withdrawn to complete the separation of the positioning tube and the heart valve stent.

[0005] However, when the current delivery device is loaded with a heart valve stent and reaches the target position, due to the tortuosity of human blood vessels, the positioning tube may rotate relative to the positioning protrusion during the positioning process, causing the locking wire to entangle the positioning protrusion and the positioning tube. When the locking wire is withdrawn to release the stent, it cannot be detached and released. At the same time, since the heart valve stent cannot be recovered after being detached from the positioning tube, once the delivery device and the heart valve stent cannot be detached, the device can only be removed by surgical thoracotomy, which causes great health hazards to the human body. Summary of the invention

[0006] In view of this, the present invention provides a connection mechanism and a stent delivery device to solve the problem that the lock wire may be entangled with the positioning tube when the heart valve stent is delivered by the current heart valve delivery and replacement device.

[0007] In a first aspect, the present invention provides a connection mechanism, comprising:

[0008] Positioning tube;

[0009] A locking wire, the locking wire being arranged in the positioning tube; the positioning tube and the locking wire being transported independently;

[0010] A connecting member, the connecting member comprising a connecting member body and a positioning protrusion connected therebetween; the positioning protrusion and the distal end of the locking wire are connected by a card-fitting and both are inserted into the positioning tube and radially constrained by the positioning tube; the connecting member body is suitable for connecting to the stent;

[0011] When the stent is being delivered, the positioning tube and the locking wire move toward the distal end synchronously to deliver the connecting member and the stent together;

[0012] When the stent is released, the positioning tube is withdrawn from the connection area between the positioning protrusion and the distal end of the locking wire, the positioning protrusion and the distal end of the locking wire lose radial constraints of the positioning tube, the locking wire moves relative to the connecting member, and the locking wire is separated from the connecting member.

[0013] The beneficial effects of the above-mentioned connection mechanism are:

[0014] The above technical solution arranges the positioning tube and the locking wire to be transported separately and independently, and arranges the portion where the locking wire is clamped and connected to the connecting member inside the positioning tube. Therefore, during the delivery of the stent, even if the positioning tube rotates relative to the connecting member, the locking wire will not be entangled in the positioning tube.

[0015] When connecting the connecting component and the locking wire, the locking wire is directly clamped and positioned on the connecting component, which simplifies the operating steps of connecting the locking wire and the connecting component, reduces the difficulty of assembling the locking wire and the connecting component, thereby improving the assembly efficiency of the locking wire and the connecting component and reducing the skill requirements for the operator.

[0016] When delivering the stent, the part where the connecting member is connected to the locking wire is inserted into the positioning tube and radially constrained by the positioning tube, which can prevent misoperation to a certain extent. When releasing the stent, the positioning tube is withdrawn from the connection area between the locking wire and the connecting member, ensuring that the locking wire and the connecting member can be separated smoothly when they move relative to each other.

[0017] Since the connection and separation process of the locking wire and the connecting component is simpler, the operation time can be significantly shortened and the operation efficiency can be improved.

[0018] In an optional embodiment, the locking wire comprises a locking wire body and a locking portion, and the locking portion is arranged at the distal end of the locking wire body;

[0019] The positioning protrusion is provided with a positioning portion, the positioning portion is a positioning groove or a positioning hole, the positioning portion has a positioning portion proximal end surface and a positioning portion distal end surface, and the locking portion is clamped and arranged in the positioning portion on the connecting member. The positioning portion is set as a positioning groove or a positioning hole with a simple structure, which can be clamped and adapted with the locking portion and also simplifies the structure.

[0020] In an optional embodiment, when the locking portion is connected to the connecting member, the locking portion extends from the proximal end of the connecting member along the bottom thereof to the distal end, and then is embedded in the positioning portion on the connecting member.

[0021] According to the above technical solution, the connection operation between the locking part and the connecting member is simple and quick, and the operator can quickly and accurately connect the locking wire to the connecting member, thereby reducing the overall operation time and improving the operation efficiency.

[0022] In an optional embodiment, the distal surface of the locking portion is configured as a first inclined surface, and the first inclined surface is configured to be inclined upward from the distal end to the proximal end; when the locking portion moves toward the distal end relative to the connecting member, the distal surface of the positioning portion and the first inclined surface gradually slide relative to each other until the two are out of contact.

[0023] In the above technical solution, on the first hand, due to the design of the first bevel, when the locking part moves toward the distal end, the distal end surface of the positioning part and the first bevel gradually slide relative to each other. This gradual sliding process allows the two to smoothly disengage from contact, avoiding the impact and damage that may be caused by sudden separation. On the second hand, the design of the first bevel reduces the friction between the locking part and the connecting member, reduces the resistance during the separation process, and makes the separation operation smoother. On the third hand, through the design of the first bevel, the separation operation of the locking wire and the connecting member becomes simpler. The operator only needs to push the locking part to move toward the distal end to achieve the separation of the two, reducing the complexity of the operation.

[0024] In an optional implementation, the inclination angle of the first inclined surface is 10° to 80°.

[0025] In an optional embodiment, the proximal surface of the locking portion is configured as a second inclined surface, and the second inclined surface is inclined upward from the proximal end to the distal end; when the locking portion moves proximally relative to the connecting member, the proximal surface of the positioning portion and the second inclined surface gradually slide relative to each other until the two are out of contact.

[0026] In the above technical solution, on the first hand, due to the design of the second bevel, when the locking part moves toward the proximal end, the proximal surface of the positioning part and the second bevel gradually slide relative to each other. This gradual sliding process allows the two to smoothly disengage from contact, avoiding the impact and damage that may be caused by sudden separation. On the second hand, the design of the second bevel reduces the friction between the locking part and the connecting member, reduces the resistance during the separation process, and makes the separation operation smoother. On the third hand, the design of the second bevel makes it easier to separate the locking wire from the connecting member. The operator only needs to push the locking part toward the proximal end to separate the two, reducing the complexity of the operation.

[0027] The above-mentioned locking wire has two different ways of separating the connecting component, and both separation methods can realize the smooth release of the connecting component and the locking part. When one of the separation methods fails, the other separation method can also be used, which improves the success rate of separation between the connecting component and the locking part, and avoids the situation where the connecting component and the locking part cannot be separated smoothly due to the failure of a certain separation method, the valve stent cannot be released smoothly, and the patient's life and health are endangered.

[0028] During the separation process of the locking wire and the connecting component, the locking wire can be pushed to the distal end or pulled back to the proximal end. The relative movement between the locking part of the locking wire and the connecting component is reasonably designed, and the operation is simple and convenient, which reduces the operating requirements for the operator.

[0029] In an optional implementation, the inclination angle of the second inclined surface is 10° to 80°.

[0030] In an optional embodiment, a recessed portion is provided on the wire locking body, the recessed portion having a proximal surface and a distal surface, the recessed portion being located between the distal end of the wire locking body and the proximal end of the locking portion, and the recessed portion being suitable for providing an accommodating space for the proximal end of the connecting member.

[0031] The above technical solution avoids interference between the proximal end of the connecting member and the lock wire body, ensuring that the relative position of the two is not affected. The design of the recessed portion allows the proximal end of the connecting member to be more tightly embedded therein, increasing the contact area between the lock wire and the connecting member, thereby enhancing the stability of the connection and preventing the connecting member from falling off due to accidental operation.

[0032] In an optional embodiment, the distal end surface of the recessed portion is transitionally connected with the proximal end surface of the locking portion, thereby avoiding the problem of an abrupt connection at the intersection of the distal end surface of the recessed portion and the second inclined surface of the locking portion. When the locking wire needs to be separated from the connecting member and the locking wire is withdrawn toward the proximal end, the intersection of the distal end surface of the recessed portion and the second inclined surface of the locking portion will not generate a large resistance, thereby making the separation between the locking wire and the connecting member smoother.

[0033] In an optional embodiment, the proximal end surface of the recessed portion and the first inclined surface are inclined in the same direction to facilitate the separation of the positioning protrusion and the locking portion.

[0034] In the above technical solution, when the positioning protrusion is separated from the locking portion, the locking wire is pushed toward the distal end, and the inclined proximal surface of the recessed portion can reduce the blocking effect on the positioning protrusion and produce a shovel-like effect, thereby prompting the connecting component to separate from the locking wire.

[0035] In an optional embodiment, the distance between the proximal end surface of the recessed portion and the first inclined surface is the same as the distance between the distal end surface of the positioning portion and the proximal end surface of the positioning protrusion.

[0036] In the above technical solution, when the locking wire moves toward the distal end, the first inclined surface of the locking wire abuts against the distal surface of the positioning portion, and at this time, the proximal surface of the connecting member abuts against the proximal surface of the recessed portion, producing a shovel-like effect, prompting the connecting member to separate from the locking wire. This design allows the connecting member to be quickly and effectively separated from the locking wire, improving the separation efficiency. The shovel effect reduces the resistance during the separation process, making the separation operation of the connecting member and the locking wire smoother and reducing the risk of damage to surrounding tissues.

[0037] In an optional embodiment, the width ratio of the locking portion to the positioning portion is 1:3 to 9:10;

[0038] And / or, the ratio of the maximum width of the locking portion to the diameter of the lock wire body does not exceed 1:2.

[0039] In an optional embodiment, the width of the positioning protrusion is greater than the inner diameter of the positioning tube, so that when the positioning protrusion is inserted into the positioning tube, the positioning protrusion can be radially constrained by the positioning tube to ensure a tight connection between the positioning protrusion and the positioning tube.

[0040] In an optional embodiment, the locking wire is made of a biocompatible material;

[0041] And / or, the positioning tube is made of biocompatible material;

[0042] and / or, the maximum diameter of the locking wire does not exceed 7Fr;

[0043] and / or, the ratio of the inner diameter to the wall thickness of the positioning tube is not less than 2:1;

[0044] And / or, the surface of the locking portion of the locking wire is smoothed.

[0045] In a second aspect, the present invention further provides a stent delivery device, comprising:

[0046] a delivery catheter adapted to radially constrain the stent;

[0047] The connecting mechanism is arranged in the delivery catheter and is suitable for delivering and releasing the stent.

[0048] The beneficial effects of the above-mentioned stent delivery device are the same as the beneficial effects of the above-mentioned connecting mechanism, and will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0050] Figure 1 It is a schematic diagram of the connection structure between the current locking wire, the positioning tube and the connecting member;

[0051] Figure 2 A schematic diagram of the structure of a locking wire in a connection mechanism provided in Example 1 of the present invention;

[0052] Figure 3 A first-view plan view of a locking wire in a connecting mechanism provided in Example 1 of the present invention;

[0053] Figure 4 A second-view plan view of a locking wire in a connecting mechanism provided in Example 1 of the present invention;

[0054] Figure 5 A structural schematic diagram of a connecting member in a connecting mechanism is provided for Example 1 of the present invention;

[0055] Figure 6 For the present invention Figure 5 A partial enlarged view of part A;

[0056] Figure 7 A schematic diagram of the structure of a locking wire and a connecting member in a connecting mechanism provided in Example 1 of the present invention when connected;

[0057] Figure 8 A schematic diagram of the structure of a positioning tube in a connection mechanism provided in Example 1 of the present invention when it is separated from the connection area between the locking wire and the connection member;

[0058] Fig. 9 A plan view of a positioning protrusion in a connecting mechanism provided in Example 2 of the present invention;

[0059] Fig.10 A plan view of a locking wire in a connecting mechanism provided in Example 2 of the present invention;

[0060] Fig.11 A structural schematic diagram of a connection mechanism provided in Example 3 of the present invention;

[0061] Fig.12 A structural schematic diagram of a connection mechanism provided in Example 4 of the present invention;

[0062] Fig.13A structural schematic diagram of a connection mechanism provided in Example 5 of the present invention;

[0063] Fig.14 This is a schematic structural diagram of another connecting mechanism provided in Example 5 of the present invention.

[0064] Description of reference numerals:

[0065] 1. Locking wire, 11. Locking wire body, 12. Locking portion, 121. First inclined surface, 122. Second inclined surface, 13. Recessed portion, 131. Proximal end surface of the recessed portion, 132. Distal end surface of the recessed portion, 14. Connecting rod portion;

[0066] 2. Positioning tube;

[0067] 3. Connecting member, 31. Connecting member body, 32. Positioning protrusion, 321. Proximal surface of the positioning protrusion, 33. Positioning portion, 331. Distal surface of the positioning portion, 332. Proximal surface of the positioning portion, 34. Clamping portion. DETAILED DESCRIPTION

[0068] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0069] The heart valve delivery and replacement device is used to deliver the heart valve prosthesis to the target location, replace the diseased heart valve with the heart valve prosthesis, and restore heart function. The existing heart valve delivery and replacement device mainly includes a delivery device and a heart valve prosthesis, and whether the heart valve prosthesis can be accurately placed in the target area depends on the connection and release mechanism of the delivery device and the heart valve prosthesis.

[0070] Combination Figure 1 As shown, the current conveying device is mainly realized by connecting a locking wire 1, a positioning tube 2 and a connecting member 3. The specific connection method is that a through hole is opened on the distal side wall of the positioning tube 2, and a positioning protrusion 32 is provided on the connecting member 3. The positioning protrusion 32 is provided with a through hole. The positioning protrusion 32 is inserted into the distal end of the connecting member to align the through hole of the positioning tube 2 with the through hole of the positioning protrusion 32, and then the locking wire 1 is passed through the two through holes to realize the connection between the positioning tube 2 and the connecting member 3.

[0071] When releasing the heart valve prosthesis, the positioning tube 2 is fixed, the locking wire 1 is pulled back, and then the connection between the positioning tube 2 and the positioning protrusion 32 is removed, and finally the positioning tube 2 is withdrawn to complete the separation of the positioning tube and the heart valve stent.

[0072] When the current delivery device loaded with the heart valve stent reaches the target position, due to the tortuosity of human blood vessels, the positioning tube may rotate relative to the positioning protrusion during the positioning process, causing the locking wire to entangle the positioning protrusion and the positioning tube. When the locking wire is withdrawn to release the stent, it cannot be detached and released. At the same time, since the heart valve stent cannot be recovered after being detached from the positioning tube, once the delivery device and the heart valve stent cannot be detached, the device can only be removed by surgical thoracotomy, which causes great health hazards to the human body.

[0073] Based on this, the present invention provides a connection mechanism, in which the positioning tube and the locking wire are arranged to be transported separately, and the portion where the locking wire is connected to the connecting member is arranged inside the positioning tube. Therefore, during the delivery of the stent, even if the positioning tube rotates relative to the connecting member, the locking wire will not be entangled with the positioning tube.

[0074] In addition, when the current delivery device is in use, it is necessary to pass the locking wire 1 through the through hole on the positioning tube and the through hole of the positioning protrusion on the connecting component. The inner diameter of these through holes is very small, and only a locking wire with a small diameter can be used for perforation, resulting in extremely high requirements for the perforation operation of the locking wire, great difficulty in perforating the locking wire, and complex installation operations, which affects the assembly efficiency of the positioning tube and the valve stent connecting component.

[0075] Based on this, the present invention provides a locking wire, which eliminates the traditional method of setting through holes on the positioning tube and the connecting member, and directly sets a locking part at the distal end of the locking wire body, and uses the locking part to directly clamp and position it on the connecting member, which is very simple and convenient, thereby improving the assembly efficiency of the positioning tube and the valve stent connecting member. When the locking part moves relative to the connecting member, the locking part can be separated from the connecting member to meet the release requirement of the connecting member.

[0076] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the term "distal end" generally refers to the end of the medical implant away from the operator; "proximal end" is opposite to "distal end" and refers to the end of the medical implant close to the operator; the term "radial" refers to the direction perpendicular to the axis of the medical implant. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0077] Combine the following Figures 2 to 8 , the specific embodiments of the present invention are described in detail in combination with the connecting mechanism of the first aspect of the present invention and the stent delivery device of the second aspect of the present invention.

[0078] Example 1

[0079] According to an embodiment of the present invention, in a first aspect, a connection mechanism is provided, Figures 2 to 8As shown, it includes a positioning tube 2, a locking wire 1 and a connecting member 3. The locking wire 1 is arranged in the positioning tube 2, and the positioning tube 2 and the locking wire 1 are transported independently.

[0080] The lock wire 1 comprises a lock wire body 11 and a locking portion 12. The locking portion 12 is arranged at the distal end of the lock wire body 11, and the locking portion 12 is connected to the connecting member 3 by clamping.

[0081] The connecting member 3 includes a connecting member body 31 and a positioning protrusion 32. The connecting member body 31 is suitable for connecting with the stent. At least one positioning protrusion 32 is provided, and the positioning protrusion 32 is provided on the connecting member body 31 and inserted into the positioning tube 2. The positioning protrusion 32 is provided with a positioning portion 33, and the locking portion 12 of the locking wire 1 is clamped in the positioning portion 33 on the connecting member 3. The connection between the positioning protrusion 32 and the locking portion 12 of the locking wire 1 can realize the transportation of the entire stent.

[0082] The above-mentioned connecting mechanism arranges the positioning tube and the locking wire in a manner of being transported separately and independently, and arranges the portion where the locking wire and the connecting component are clamped and connected inside the positioning tube. Therefore, during the delivery of the stent, even if the positioning tube rotates relative to the connecting component, the locking wire will not be entangled in the positioning tube.

[0083] When connecting the connecting component and the locking wire, the locking wire is directly clamped and positioned on the connecting component, which simplifies the operating steps of connecting the locking wire and the connecting component, reduces the difficulty of assembling the locking wire and the connecting component, thereby improving the assembly efficiency of the locking wire and the connecting component and reducing the skill requirements for the operator.

[0084] When the stent is being delivered, the connecting member 3 is connected to the locking wire 1, and the portion of the connecting member 3 connected to the locking wire 1 is inserted into the positioning tube 2 and radially constrained by the positioning tube 2. At this time, when the positioning tube 2 moves toward the distal end, it can push the connecting member 3 and the locking wire 1 to move synchronously toward the distal end, and at this time, the positioning tube 2 can also be coupled with the locking wire 1 (that is, the two move synchronously) to jointly deliver the connecting member 3 and the stent, ensuring stable delivery of the stent. When the locking portion 12 moves synchronously with the connecting member 3, the locking portion 12 is positioned and connected with the connecting member 3, ensuring the stability of the delivery of the connecting member 3 and the stent, and ensuring that the connecting member 3 and the stent can be smoothly and accurately delivered to the target area.

[0085] When the stent is released, the positioning tube 2 and the locking wire 1 are separated (i.e., the two can move independently), the positioning tube 2 is withdrawn from the connection area between the locking wire 1 and the connecting member 3, and the portion of the connecting member 3 connected to the locking wire 1 loses the radial constraint of the positioning tube 2 (i.e., the portion of the connecting member 3 connected to the locking wire 1 is no longer in close contact with the positioning tube 2), the locking portion 12 of the locking wire 1 moves relative to the connecting member 3, and the outer part of the locking portion 12 of the locking wire 1 is no longer subject to the constraint force, so the locking portion 12 of the locking wire 1 can be separated from the connecting member 3, making the separation operation between the locking wire and the connecting member 3 easier, and the locking portion 12 can be separated from the connecting member 3 by simply operating the locking portion 12. Among them, the movement of the locking portion 12 relative to the connecting member 3 is not limited to the form of movement and rotation of the locking portion 12 relative to the connecting member 3.

[0086] On the contrary, if the positioning tube 2 is not withdrawn from the connection area between the locking wire 1 and the connecting member 3 when the stent is released, and the locking wire 1 is directly pushed to move relative to the connecting member 3, the radial constraint of the positioning tube 2 on the part where the connecting member 3 and the locking wire 1 are connected will cause the locking wire 1 and the connecting member 3 to be unable to separate smoothly. Therefore, when the stent is delivered, the part where the connecting member 3 and the locking wire 1 are connected is inserted into the positioning tube 2 and radially constrained by the positioning tube 2, which can prevent misoperation to a certain extent. When the stent is released, the positioning tube 2 is withdrawn from the connection area between the locking wire 1 and the connecting member 3, ensuring that the locking wire 1 and the connecting member 3 can be separated smoothly when they move relative to each other.

[0087] During the separation process of the locking wire 1 and the connecting component 3, the locking wire can be pushed toward the distal end or pulled back toward the proximal end. The relative movement between the locking part 12 of the locking wire 1 and the connecting component 3 is reasonably designed, and the operation is simple and convenient, which reduces the operating requirements for the operator.

[0088] Since the connection and separation process of the locking wire and the connecting member 3 is simpler, the operation time can be significantly shortened and the operation efficiency can be improved.

[0089] It should be noted that the above-mentioned locking wire is not only suitable for heart valve delivery and replacement devices, but can also be applied to other medical devices that require fine connection and separation, and has wide applicability.

[0090] In some embodiments, the locking portion 12 is clamped in the positioning portion 33 on the connecting member 3, and the positioning portion 33 is a positioning groove or a positioning hole. The positioning portion 33 has a positioning portion proximal surface 332 and a positioning portion distal surface 331. In this embodiment, when the positioning portion 33 is a positioning groove, the positioning groove is a rectangular positioning groove, but is not limited to a rectangular positioning groove, and can also be a positioning groove of other shapes; when the positioning portion 33 is a positioning hole, the positioning hole is a rectangular positioning hole, but is not limited to a rectangular positioning hole, and can also be a positioning hole of other shapes. In this embodiment, the positioning portion 33 is set as a positioning groove or positioning hole with a simple structure, which can be clamped and adapted with the locking portion 12 while simplifying the structure.

[0091] In some embodiments, when connecting the locking portion 12 to the connecting member 3, the locking portion 12 extends from the proximal end of the connecting member 3 along its bottom to the distal end, and then embeds into the positioning portion 33 on the connecting member 3. The connection operation is simple and quick, and the operator can quickly and accurately connect the locking wire to the connecting member 3, thereby reducing the overall operation time and improving the operation efficiency.

[0092] When the current stent delivery device is loaded with a valve stent and passes through tortuous human blood vessels to reach the target area, it is difficult to release the valve stent.

[0093] In order to ensure the smooth release of the valve stent, in some embodiments, Figure 3 As shown, the distal surface of the locking portion 12 is set as a first inclined surface 121, and the first inclined surface 121 is inclined upward from the distal end to the proximal end. When the locking portion 12 moves distally relative to the connecting member 3, the distal surface 331 of the positioning portion and the first inclined surface 121 gradually slide relative to each other until the two are out of contact.

[0094] In this embodiment, on the one hand, due to the design of the first bevel 121, when the locking portion 12 moves toward the distal end, the distal end surface 331 of the positioning portion and the first bevel 121 gradually slide relative to each other. This progressive sliding process allows the two to smoothly disengage from contact, avoiding the impact and damage that may be caused by sudden separation. On the other hand, the design of the first bevel 121 reduces the friction between the locking portion 12 and the connecting member 3, reduces the resistance during the separation process, makes the separation operation smoother, reduces the driving force on the connecting member 3, and effectively avoids the displacement of the connecting member 3. On the third hand, through the design of the first bevel 121, the separation operation of the lock wire and the connecting member 3 becomes simpler. The operator only needs to push the locking portion 12 to move toward the distal end to achieve the separation of the two, reducing the complexity of the operation.

[0095] The inclination angle of the first bevel 121 is 10° to 80°. Within this angle range, the first bevel 121 can ensure the connection reliability between the guide wire and the connecting member 3 when the guide wire and the connecting member 3 move synchronously, and can ensure that the two can be smoothly separated when the lock wire moves relative to the connecting member 3. The angle and shape of the first bevel 121 can be adjusted according to different surgical requirements to adapt to different clinical conditions. That is, the first bevel 121 can be an inclined straight bevel, an inclined arc bevel, or a combination of an inclined straight bevel and an inclined arc bevel.

[0096] In some embodiments, in combination Figure 3 As shown, the proximal surface of the locking portion 12 is set as a second inclined surface 122, and the second inclined surface 122 is inclined upward from the proximal end to the distal end. When the locking portion 12 moves toward the proximal end relative to the connecting member 3, the proximal surface 332 of the positioning portion and the second inclined surface 122 gradually slide relative to each other until the two are out of contact.

[0097] In this embodiment, on the one hand, due to the design of the second bevel 122, when the locking portion 12 moves toward the proximal end, the proximal end surface 332 of the positioning portion and the second bevel 122 gradually slide relative to each other. This progressive sliding process allows the two to smoothly disengage from contact, avoiding the impact and damage that may be caused by sudden separation. On the other hand, the design of the second bevel 122 reduces the friction between the locking portion 12 and the connecting member 3, reduces the resistance during the separation process, makes the separation operation smoother, reduces the driving force on the connecting member 3, and effectively avoids the displacement of the connecting member 3. On the third hand, through the design of the second bevel 122, the separation operation of the lock wire and the connecting member 3 becomes simpler. The operator only needs to push the locking portion 12 to move toward the proximal end to achieve the separation of the two, reducing the complexity of the operation.

[0098] The inclination angle of the second bevel 122 is 10° to 80°. Within this angle range, the second bevel 122 can ensure the connection reliability between the guide wire and the connecting member 3 when the guide wire moves synchronously, and can also ensure that the two can be smoothly separated when the lock wire moves relative to the connecting member 3. The angle and shape of the second bevel 122 can be adjusted according to different surgical requirements to adapt to different clinical conditions. That is, the second bevel 122 can be an inclined straight bevel, an inclined arc bevel, or a combination of an inclined straight bevel and an inclined arc bevel.

[0099] The above-mentioned locking wire can set only the distal surface of the locking part 12 as the first inclined surface 121, or only the proximal surface of the locking part 12 as the second inclined surface 122, or both the distal surface of the locking part 12 and the proximal surface of the locking part 12 can be set as the first inclined surface 121 and the proximal surface of the locking part 12 can be set as the second inclined surface 122.

[0100] When the distal surface of the locking portion 12 is set as the first inclined surface 121, and the proximal surface of the locking portion 12 is set as the second inclined surface 122, the locking portion 12 of the above-mentioned locking wire forms a triangular wedge structure, and the above-mentioned locking wire has two different ways of separating the connecting component 3. Both separation methods can realize the smooth release of the connecting component 3 and the locking portion 12. When one of the separation methods fails, another separation method can also be used, which improves the success rate of separation between the connecting component 3 and the locking portion 12, and avoids the situation that the connecting component 3 and the locking portion 12 cannot be separated smoothly due to the failure of a certain separation method, the valve stent cannot be released smoothly, and the patient's life and health are endangered.

[0101] The following is a detailed description of the separation methods of the two connecting components 3 and the locking portion 12.

[0102] The first method of separating the connecting member 3 from the locking portion 12 is: Figure 8 As shown, the positioning tube 2 is withdrawn toward the proximal end to separate the positioning tube 2 from the connection area between the locking wire 1 and the connecting member 3. The locking wire 1 is pushed toward the distal end, and the first inclined surface 121 of the locking portion 12 at the distal end of the locking wire 1 slides toward the distal end along the positioning hole or positioning groove of the positioning protrusion until the first inclined surface 121 of the locking portion 12 is gradually separated from the distal end surface of the positioning hole or positioning groove, and the separation is automatically realized.

[0103] The second method of separating the connecting member 3 from the locking portion 12 is: Figure 8 As shown, the positioning tube 2 is withdrawn toward the proximal end to separate the positioning tube 2 from the connection area between the locking wire 1 and the connecting member 3. The locking wire 1 is withdrawn to move toward the proximal end, and the second inclined surface 122 of the locking portion 12 of the locking wire 1 will slide toward the proximal end along the positioning hole or positioning groove of the positioning protrusion until the second inclined surface 122 of the locking portion 12 is gradually separated from the proximal end surface of the positioning hole or positioning groove, thereby achieving automatic separation.

[0104] In some embodiments, a recessed portion 13 is provided on the lock wire body 11, and the recessed portion 13 has a proximal surface 131 and a distal surface 132 of the recessed portion. The recessed portion 13 is located between the distal end of the lock wire body 11 and the proximal end of the locking portion 12. The recessed portion 13 is suitable for providing an accommodation space for the proximal end of the connecting member 3, avoiding interference between the proximal end of the connecting member 3 and the lock wire body 11, and ensuring that the relative positions of the two are not affected. The design of the recessed portion 13 allows the proximal end of the connecting member 3 to be more tightly embedded therein, increasing the contact area between the lock wire and the connecting member 3, thereby enhancing the stability of the connection and preventing the connecting member 3 from falling off due to accidental operation.

[0105] In some embodiments, the distal end surface 132 of the recessed portion and the proximal end surface (i.e., the second inclined surface 122) of the locking portion 12 are transitionally connected, thereby avoiding the problem of an abrupt connection at the intersection of the distal end surface 132 of the recessed portion and the second inclined surface 122 of the locking portion 12. When the locking wire and the connecting member 3 need to be separated and the locking wire is withdrawn toward the proximal end, the intersection of the distal end surface 132 of the recessed portion and the second inclined surface 122 of the locking portion 12 will not generate a large resistance, thereby making the separation between the locking wire and the connecting member 3 smoother.

[0106] In some embodiments, in combination Figure 3 As shown, the proximal end surface 131 of the recessed portion and the distal end surface (i.e., the first inclined surface 121) of the locking portion 12 are inclined in the same direction, that is, the proximal end surface 131 of the recessed portion is set as a third inclined surface. In this embodiment, when the positioning protrusion 32 is separated from the locking portion 12, the locking wire 1 is pushed toward the distal end, and the inclined proximal end surface 131 of the recessed portion can reduce the blocking effect on the positioning protrusion 32 and produce a shovel-like effect, prompting the connection member 3 to separate from the locking wire.

[0107] It should be noted that, taking the example of the connecting member 3 being clamped and arranged above the locking portion 12, the "inclined in the same direction" in this embodiment means that the first inclined surface 121 of the locking portion 12 is inclined upward from the distal end to the proximal end, and the proximal end surface 131 of the recessed portion is also inclined upward from the distal end to the proximal end. Here, the inclination angles of the proximal end surface 131 of the recessed portion and the distal end surface of the locking portion 12 may be the same or different.

[0108] The spacing between the proximal surface 131 of the recessed portion and the distal surface of the locking portion 12 (i.e., the first inclined surface 121) is the same as the spacing between the distal surface 331 of the positioning portion and the proximal surface 321 of the positioning protrusion. Taking the example of the connecting member 3 being clamped and arranged above the locking portion 12, when the locking wire moves toward the distal end, the first inclined surface 121 of the locking wire abuts against the distal surface 331 of the positioning portion, and at this time, the proximal surface of the connecting member 3 abuts against the proximal surface 131 of the recessed portion, producing a shovel-like effect, prompting the connecting member 3 to separate from the locking wire. This design enables the connecting member 3 to be quickly and effectively separated from the locking wire, thereby improving the separation efficiency. The shovel effect reduces the resistance during the separation process, making the separation operation of the connecting member 3 and the locking wire smoother and reducing the risk of damage to surrounding tissues.

[0109] On the other hand, when the locking wire and the connecting member 3 move synchronously, that is, when the locking wire and the connecting member 3 do not need to be separated, the first inclined surface 121 of the locking wire abuts against the distal surface 331 of the positioning portion, and at the same time, the proximal surface of the connecting member 3 abuts against the proximal surface 131 of the recessed portion, forming a double abutment, reducing the looseness of the connecting member 3 in the connected state, and ensuring the firmness and reliability of the connection.

[0110] In some embodiments, the width ratio of the locking portion 12 to the positioning portion 33 is 1:3 to 9:10. Within this ratio range, the connection reliability between the guide wire and the connecting member 3 can be ensured when the guide wire and the connecting member 3 move synchronously, and the connection reliability between the guide wire and the connecting member 3 can be ensured when the locking wire moves relative to the connecting member 3.

[0111] In some embodiments, in combination Figure 4 As shown, the ratio of the maximum width of the locking portion 12 to the diameter of the lock wire body 11 does not exceed 1:2, so that the locking portion 12 is neither too wide nor too narrow, and the width of the locking portion 12 is moderate, so that the positioning protrusion 32 matched with the locking portion 12 is not too wide.

[0112] In some embodiments, the width of the positioning protrusion 32 is greater than the inner diameter of the positioning tube 2, so that when the positioning protrusion 32 is inserted into the positioning tube 2, the positioning protrusion 32 can be radially constrained by the positioning tube 2, and the positioning protrusion 32 is in close contact with the positioning tube 2. More specifically, the positioning protrusion 32 is a square protrusion, and the positioning protrusion 32 can also be other shapes.

[0113] In some embodiments, in combination Figure 5 As shown, there are three positioning protrusions 32 with an included angle of 120° between them, and there are three positioning tubes 2 and locking wires 1 respectively. This evenly distributed design enables each positioning protrusion 32 to provide a stable support point, ensuring the balance and stability of the connecting component 3 during the transportation and release process.

[0114] In some embodiments, the locking wire 1 is made of a material with high biocompatibility, more specifically, the locking wire is a cylindrical nickel-titanium wire. Nickel-titanium wire is a material with extremely high biocompatibility, which can significantly reduce the body's immune response to implants, reduce the risk of inflammation and rejection, and reduce damage to human tissues.

[0115] In some embodiments, the maximum diameter of the locking wire 1 does not exceed 7Fr, so that the locking wire 1 can adapt to smaller blood vessels and is suitable for stent delivery in various types of blood vessels. The smaller diameter of the locking wire 1 reduces friction and damage to the blood vessel wall.

[0116] In some embodiments, the positioning tube 2 is made of biocompatible materials. More specifically, the positioning tube 2 is a circular mesoporous polymer tube with good biocompatibility and high flexibility, so that the positioning tube 2 can adapt to complex vascular pathways.

[0117] In some embodiments, the ratio of the inner diameter to the wall thickness of the positioning tube 2 is not less than 2:1, so that the inner cavity of the positioning tube 2 is larger and the wall of the positioning tube 2 is thinner, thereby making the outer diameter of the locking wire that the positioning tube 2 can accommodate larger and improving flexibility.

[0118] In some embodiments, the surface of the locking portion 12 of the locking wire 1 is smoothed to reduce damage to human tissues and blood vessels.

[0119] The above-mentioned connection mechanism is designed with a triangular hook structure at the distal end of the lock wire 1. The entire distal end of the lock wire 1 is shuttle-shaped. The triangular hook structure is embedded in the square positioning hole or square positioning groove of the positioning protrusion 32 and combined with the positioning tube to complete the overall connection.

[0120] When the valve stent is connected to the connecting mechanism, the locking wire 1 is in the positioning tube 2, and the distal end of the locking wire 1 extends out of the distal end of the positioning tube 2. The locking parts 12 (triangular inserts) at the distal ends of the three locking wires are respectively embedded in the square positioning holes or positioning grooves of the positioning protrusions, and the locking parts 12 of the locking wire 1 fit tightly with the positioning holes or positioning grooves of the positioning protrusions. Pull the locking wire 1 back toward the proximal end, and the locking wire 1 drives the positioning protrusion to move toward the proximal end, and pull the positioning protrusion into the distal end of the positioning tube 2 until the distal end of the positioning tube 2 fits with the bottom of the positioning protrusion. With the help of the constraint of the inner cavity of the positioning tube 2, the locking wire 1 is tightly connected with the positioning protrusion 32. The other two connecting components 3 are connected in the same way to complete the connection between the valve stent and the connecting mechanism.

[0121] The first method of separating the connecting member 3 and the valve stent from the locking wire: the stent delivery device loads the valve stent through the tortuous human blood vessels to reach the target area. After the connecting member 3 completes the positioning (i.e., the connecting member 3 has been fixed to the position of the blood vessel), when releasing the valve stent, the positioning tube 2 is withdrawn proximally to separate the positioning tube 2 from the connection area between the locking wire 1 and the connecting member 3. The locking wire 1 is moved distally, and the first inclined surface 121 of the locking portion 12 at the distal end of the locking wire 1 will slide distally along the positioning hole or positioning groove of the positioning protrusion until the first inclined surface 121 of the locking portion 12 gradually separates from the distal end surface of the positioning hole or positioning groove, and the separation is automatically achieved. At the same time, the third inclined surface on the locking wire recessed portion will contact the distal end surface of the positioning protrusion, play a shovel-like effect, and promote the separation of the positioning protrusion 32 from the locking wire 1, and complete the separation of the locking wire 1 from the positioning protrusion 32. The locking wire 1 and the positioning tube 2 are withdrawn proximally to achieve the release of the connecting member 3 and the valve stent.

[0122] The second method of separating the connecting member 3 and the valve stent from the locking wire: When the first separation method fails, the second separation method can be used. The stent delivery device loads the valve stent through the tortuous human blood vessels to reach the target area. After the connecting member 3 completes the positioning (that is, the connecting member 3 has been fixed to the position of the blood vessel), when releasing the valve stent, the positioning tube 2 is withdrawn proximally to separate the positioning tube 2 from the connection area between the locking wire 1 and the connecting member 3. The locking wire 1 is withdrawn to move the locking wire 1 proximally, and the second inclined surface 122 of the locking portion 12 (triangular insert) of the locking wire 1 will slide proximally along the positioning hole or positioning groove of the positioning protrusion until the second inclined surface 122 of the locking portion 12 is gradually separated from the proximal surface of the positioning hole or positioning groove, achieving automatic separation, and completing the separation of the locking wire 1 from the positioning protrusion 32. The locking wire 1 and the positioning tube 2 are withdrawn proximally to achieve the release of the connecting member 3 and the valve stent.

[0123] Example 2

[0124] This embodiment provides a connection mechanism. In this embodiment, the locking portion 12 and the recessed portion 13 on the lock wire of embodiment 1 are arranged on the positioning protrusion 32, combined with Fig. 9 As shown, the positioning protrusion 32 is provided with a recessed portion 13 and a locking portion 12 in sequence from the distal end to the proximal end. Correspondingly, in this embodiment, the positioning portion 33 on the positioning protrusion of embodiment 1 is arranged at the distal end of the locking wire, combined with Fig.10 shown.

[0125] In this embodiment, the locking wire is separated from the positioning protrusion by pushing the positioning portion 33 on the positioning protrusion toward the distal end or toward the proximal end.

[0126] Example 3

[0127] This embodiment provides a connection mechanism, combined with Figure 5 and Fig.11 As shown, it includes a positioning tube 2, a locking wire 1 and a connecting member 3. The locking wire 1 is arranged in the positioning tube 2, and the positioning tube 2 and the locking wire 1 are transported independently. The locking wire 1 includes a locking wire body 11 and a locking portion 12. The locking portion 12 is arranged at the distal end of the locking wire body 11, and the locking portion 12 is clamped and connected with the connecting member 3. The connecting member 3 includes a connecting member body 31 and a positioning protrusion 32.

[0128] The difference between this embodiment and the first embodiment lies in that the structure of the locking wire 1 and the structure of the positioning protrusion 32 of this embodiment are different from those of the first embodiment.

[0129] The locking portion 12 of this embodiment is set to be cylindrical, and a connecting rod portion 14 is arranged between the locking portion 12 and the wire lock body 11. The outer diameter of the connecting rod portion 14 is smaller than the outer diameter of the locking portion 12 and the outer diameter of the wire lock body 11, so that an annular recessed portion 13 is formed between the locking portion 12, the wire lock body 11 and the connecting rod portion 14.

[0130] In order to better fit the annular recessed portion 13 on the lock wire 1, the positioning portion 33 on the positioning protrusion 32 of this embodiment is a groove, and the proximal end of the positioning protrusion 32 is provided with a clamping portion 34, and the groove is provided between the clamping portion 34 and the connecting member body 31. And the side of the clamping portion 34 corresponding to the connecting rod portion 14 of this embodiment is provided as a horizontal plane.

[0131] When connecting the lock wire 1 and the positioning protrusion 32, the locking portion 12 is snap-fitted with the positioning portion 33, and the snap-fitting portion 34 is snap-fitted with the recessed portion 13. Then the positioning tube 2 is arranged in the area where the lock wire 1 and the positioning protrusion 32 are connected, and the positioning tube 2 radially constrains the lock wire 1 and the positioning protrusion 32.

[0132] In this embodiment, during the stent delivery process, the positioning tube 2 radially limits the locking wire 1 and the positioning protrusion 32. Even if the locking wire 1 and the positioning protrusion 32 are relatively twisted, the locking portion 12 is set as a cylindrical locking portion 12 and can still fit with the positioning portion 33. Since the recessed portion 13 is an annular groove, the clamping portion 34 can still fit with the recessed portion 13. Therefore, this embodiment can adapt to more complex blood vessel types. During the stent delivery process, it is not easy to unlock the locking wire 1 and the positioning protrusion 32, ensuring the safety of stent release.

[0133] In some embodiments, the axial length of the positioning portion 33 (groove) is greater than the axial length of the locking portion 12, and when the locking portion 12 is assembled into the positioning portion 33, there is a distance between the distal end surface of the locking portion 12 and the distal inner wall of the positioning portion 33, and this distance is called the first movement space. The axial length of the recessed portion 13 is greater than the axial length of the clamping portion 34, and when the clamping portion 34 is assembled into the recessed portion 13, there is a distance between the proximal end surface of the clamping portion 34 and the proximal inner wall of the recessed portion 13, and this distance is called the second movement space.

[0134] In this embodiment, when it is necessary to separate the locking wire 1 from the positioning protrusion 32, the positioning tube 2 is retracted. When the locking wire 1 is pushed toward the distal end, the locking portion 12 can be smoothly disengaged from the positioning portion 33, and the clamping portion 34 can also be disengaged from the recessed portion 13. The separation process is smoother and the resistance is reduced.

[0135] In some embodiments, the height of the distal end of the positioning protrusion is higher than the height of the clamping portion 34 , so that when the locking wire 1 moves relative to the positioning protrusion, the locking portion 12 of the locking wire 1 is limited.

[0136] In some embodiments, the distal end surface 331 of the positioning portion is configured as a fourth inclined surface, which is configured to tilt downward from the distal end to the proximal end. When the locking wire moves toward the distal end, the end surface of the locking portion 12 and the fourth inclined surface gradually slide relative to each other until the two are out of contact.

[0137] In some embodiments, the proximal surface of the clamping portion is configured as a fifth inclined surface, and the fifth inclined surface is configured to be inclined upward from the proximal end to the distal end.

[0138] In some embodiments, the proximal surface 332 of the positioning portion is configured as a sixth inclined surface, and the sixth inclined surface is configured to be inclined upward from the distal end to the proximal end.

[0139] Example 4

[0140] This embodiment provides a connection mechanism, combined with Fig.12 As shown, in this embodiment, the locking portion 12 and the connecting rod portion 14 in Embodiment 3 are arranged on the positioning protrusion 32 , and the positioning portion 33 and the clamping portion 34 in Embodiment 3 are arranged on the lock wire 1 .

[0141] Example 5

[0142] This embodiment provides a connection mechanism, combined with Fig.13 As shown, in this embodiment, the locking portion 12 of the lock wire and the positioning portion 33 of the positioning protrusion 32 are arranged to be hooked and buckled with each other. In this embodiment, the opening of the locking portion 12 faces upward, and the opening of the positioning portion 33 faces downward. When the positioning tube 2 is withdrawn, the lock wire 1 is pushed toward the distal end, and the lock wire 1 and the positioning protrusion 32 can be separated.

[0143] As an alternative embodiment, in combination Fig.14 As shown, the opening of the locking portion 12 faces downward, and the opening of the positioning portion 33 faces upward. When the positioning tube 2 is withdrawn, the locking wire 1 is pushed toward the distal end, so that the locking wire 1 can be separated from the positioning protrusion 32.

[0144] In addition, it should be noted that the connection mechanism of the above-mentioned embodiments 1-5 can remove the connection member 3, the lock wire 1 may not be arranged on the connection member 3, a positioning protrusion 32 may be arranged on the stent of the valve, and the lock wire 1 may be directly connected to the positioning protrusion 32 of the stent of the valve. By removing the connection member 3, the entire connection mechanism becomes simpler, the number of components is reduced, and the assembly complexity and manufacturing cost are reduced.

[0145] Example 6

[0146] According to an embodiment of the present invention, in a second aspect, a stent delivery device is provided, comprising a delivery catheter and any one of the connecting mechanisms in Examples 1 to 5. The connecting mechanism is arranged in the delivery catheter, and the connecting mechanism is suitable for delivering and releasing the valve stent. The valve stent is a self-expanding stent, the delivery catheter is suitable for radially constraining the valve stent, and the delivery catheter is used to deliver the valve stent and the connecting mechanism. When the delivery catheter drives the stent and the connecting mechanism to move to the vicinity of the target position, the valve stent is delivered through the connecting mechanism, so that the valve stent extends from the delivery catheter, driving the valve stent to move to the target area. Then, the delivery catheter is withdrawn proximally, so that the delivery catheter moves a certain distance proximally, so that the valve stent is completely exposed from the delivery catheter, and the valve stent self-expands and is fixed at the target position. Then, the connecting mechanism is operated to disconnect the connecting mechanism from the connecting member 3 on the valve stent, so as to release the valve stent. Finally, the delivery catheter and the connecting mechanism are withdrawn.

[0147] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A connecting mechanism, characterized in that: include: Positioning tube (2); A locking wire (1), wherein the locking wire (1) is arranged in the positioning tube (2); the positioning tube (2) and the locking wire (1) are transported independently; A connecting member (3), the connecting member (3) comprising a connecting member body (31) and a positioning protrusion (32) connected thereto; the positioning protrusion (32) and the distal end of the locking wire (1) are connected by clamping and both are inserted into the positioning tube (2), and are radially constrained by the positioning tube (2); the connecting member body (31) is suitable for connecting to a stent; When the stent is being transported, the positioning tube (2) and the locking wire (1) move toward the distal end synchronously to jointly transport the connecting member (3) and the stent; When the stent is released, the positioning tube (2) is withdrawn from the connection area between the positioning protrusion (32) and the distal end of the locking wire (1), the positioning protrusion (32) and the distal end of the locking wire (1) lose the radial constraint of the positioning tube (2), the locking wire (1) moves relative to the connecting member (3), and the locking wire (1) is separated from the connecting member (3).

2. The connection mechanism according to claim 1, characterized in that: The locking wire (1) comprises a locking wire body (11) and a locking portion (12), wherein the locking portion (12) is arranged at the distal end of the locking wire body (11); The positioning protrusion (32) is provided with a positioning portion (33), the positioning portion (33) is a positioning groove or a positioning hole, the positioning portion (33) has a positioning portion proximal end surface (332) and a positioning portion distal end surface (331), and the locking portion (12) is clamped in the positioning portion (33) on the connecting member (3).

3. The connection mechanism according to claim 2, characterized in that: The distal surface of the locking portion (12) is arranged as a first inclined surface (121), and the first inclined surface (121) is arranged to be inclined upward from the distal end to the proximal end; when the locking portion (12) moves distally relative to the connecting member (3), the distal surface (331) of the positioning portion and the first inclined surface (121) gradually slide relative to each other until the two are out of contact.

4. The connection mechanism according to claim 3, characterized in that: The inclination angle of the first inclined surface (121) is 10° to 80°.

5. The connection mechanism according to claim 3, characterized in that: The wire locking body (11) is provided with a recessed portion (13), the recessed portion (13) having a proximal surface (131) and a distal surface (132) of the recessed portion, the recessed portion (13) being located between the distal end of the wire locking body (11) and the proximal end of the locking portion (12), and the recessed portion (13) being suitable for providing an accommodating space for the proximal end of the connecting member (3).

6. The connection mechanism according to claim 5, characterized in that: The proximal end surface (131) of the recessed portion and the first inclined surface (121) are inclined in the same direction to facilitate the separation of the positioning protrusion (32) and the locking portion (12).

7. The connection mechanism according to claim 6, characterized in that: The distance between the proximal end surface (131) of the recessed portion and the first inclined surface (121) is the same as the distance between the distal end surface (331) of the positioning portion and the proximal end surface (321) of the positioning protrusion.

8. The connection mechanism according to claim 5, characterized in that: The distal end surface (132) of the recessed portion is transitionally connected to the proximal end surface of the locking portion (12).

9. The connection mechanism according to any one of claims 2 to 8, characterized in that: The proximal surface of the locking portion (12) is arranged as a second inclined surface (122), and the second inclined surface (122) is arranged to be inclined upward from the proximal end to the distal end; when the locking portion (12) moves toward the proximal end relative to the connecting member (3), the proximal surface (332) of the positioning portion and the second inclined surface (122) gradually slide relative to each other until the two are out of contact.

10. The connection mechanism according to claim 9, characterized in that: The inclination angle of the second inclined surface (122) is 10° to 80°.

11. The connection mechanism according to any one of claims 2 to 8, characterized in that: The width ratio of the locking portion (12) to the positioning portion (33) is 1:3 to 9:10; And / or, the ratio of the maximum width of the locking portion (12) to the diameter of the wire locking body (11) does not exceed 1:

2.

12. The connection mechanism according to any one of claims 1 to 6, characterized in that: The width of the positioning protrusion (32) is greater than the inner diameter of the positioning tube (2).

13. The connection mechanism according to any one of claims 1 to 6, characterized in that: The locking wire (1) is made of biocompatible material; And / or, the positioning tube (2) is made of biocompatible material; and / or, the maximum diameter of the locking wire (1) does not exceed 7Fr; and / or, the ratio of the inner diameter to the wall thickness of the positioning tube (2) is not less than 2:1; And / or, the surface of the locking portion (12) of the locking wire (1) is smoothed.

14. A stent delivery device, characterized in that: include: a delivery catheter adapted to radially constrain the stent; The connecting mechanism according to any one of claims 1-13 is arranged in a delivery catheter, and is suitable for delivering and releasing the stent.

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