Connecting device

Abstract

The invention relates to a connecting device which comprises a conveying assembly used for conveying and releasing a bridging support. The far end of the capturing assembly is located on the outer side of the conveying assembly, and a capturing gap is formed between the capturing assembly and the peripheral face of the far end of the conveying assembly; the capturing assembly has a collecting state and a releasing state, and the capturing gap of the capturing assembly in the collecting state is smaller than the capturing gap of the capturing assembly in the releasing state. The capturing gap is used for containing and clamping an autologous blood vessel of a patient, the autologous blood vessel can be dragged into the artificial blood vessel, finally, the conveying assembly releases the bridging support in the autologous blood vessel, the two ends of the bridging support are anchored to the artificial blood vessel and the autologous blood vessel respectively, and therefore the autologous blood vessel and the artificial blood vessel are rapidly connected.

Description

Technical Field

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

[0002] Aortic dissection is an acute aortic disease with rapid onset, rapid progression, high mortality, great surgical difficulty and poor prognosis. The pathophysiology of aortic dissection is the rupture of the aortic intima, blood flow rushes into the middle layer of the aorta, causing the middle layer of the aorta to split into true and false lumens. In existing medical technologies, patients with Stanford type A aortic dissection who suffer from lesions in the entire aorta (including the ascending aorta, aortic arch, descending aorta and abdominal aorta) are generally treated with aortic arch replacement surgery. The human aortic arch is connected to three branch blood vessels, namely the left subclavian artery, the left common carotid artery, and the innominate artery. These three branch blood vessels ensure the normal blood supply to the upper limbs and brain. Figure 1 As shown, the aortic arch replacement surgery requires cutting off the connection between the aortic arch 01 and the branch blood vessels 02, and using extracorporeal circulation to maintain blood supply to the upper limbs and the brain. Figure 2 As shown, after implanting the intraoperative stent 03, the surgeon aligns the cross-section of the patient's branch blood vessel 02 and the intraoperative stent 03 and then connects them. The difficulty of the operation is that the branch stent 031 of the intraoperative stent must be smoothly connected to the corresponding branch blood vessel 02 so that the branch will not be displaced or slipped during and after the operation. If the branch in the intraoperative stent is displaced or even detached from the branch blood vessel, serious consequences will occur. In some operations, the three branches of the aortic arch must be cut off before being connected to the intraoperative stent. At present, the branches of the intraoperative stent and the corresponding branch blood vessels are mainly connected by manual suture and by means of connectors such as rolling belts. These connection methods require high proficiency of the doctor and require a long operation time. The long-term freedom of the branch blood vessels will increase the probability of brain, internal organs and limb injuries in patients. Summary of the invention

[0003] Based on this, it is necessary to provide a medical device that can quickly anastomose the intraoperative stent and the patient's own blood vessels during surgery.

[0004] The present invention provides a connecting device, comprising:

[0005] a delivery assembly for delivering and releasing the bridging stent;

[0006] A capture component, wherein the distal end of the capture component is located outside the conveying component, and a capture gap is formed between the capture component and the outer peripheral surface of the distal end of the conveying component;

[0007] The capture component has a contracted state and a released state, and a capture gap when the capture component is in the contracted state is smaller than a capture gap when the capture component is in the released state.

[0008] In one embodiment, the connecting device further comprises an outer sheath tube, and the outer sheath tube is axially movably sleeved outside the conveying assembly;

[0009] The capture component includes at least one clamping claw. When the capture component is in the contracted state, at least the proximal end of the clamping claw is located inside the outer sheath tube; when the capture component is in the released state, the clamping claw is located outside the outer sheath tube.

[0010] In one embodiment, the clamp includes a connecting section and a clamping section; the angle between the connecting section and the central axis of the inner sheath tube is α; the angle between the clamping section and the central axis of the inner sheath tube is β; when the capture assembly is in a released state, α>β.

[0011] In one embodiment, when the capture assembly is in a contracted state, an angle β between the inner side surface of the clamping section and the central axis of the inner sheath tube is equal to 0.

[0012] In one embodiment, a buffer is connected to a side of the clamping section facing the inner sheath tube.

[0013] In one embodiment, a wrapping structure is connected between two adjacent clamping jaws, and the wrapping structure shrinks when the capturing assembly is in a contracted state, and expands when the capturing assembly is in a released state.

[0014] In one embodiment, the delivery assembly includes a stent sheath and an inner sheath core; the inner sheath core is axially movable in the stent sheath, a receiving space is formed between the distal end of the inner sheath core and the distal end of the stent sheath, and the bridging stent is arranged in the receiving space;

[0015] The clamping claw is connected to the distal end side of the stent sheath.

[0016] In one embodiment, the capture component further includes an inner sheath tube, which is axially movably mounted outside the conveying component, and the clamp is connected to the end of the inner sheath tube.

[0017] In one embodiment, the connecting device further comprises a handle assembly, and the handle assembly comprises a fixed handle, a sliding handle and a sliding block;

[0018] The fixed handle is connected to the proximal end of the inner sheath core;

[0019] The sliding handle is connected to the proximal end of the stent sheath, and the sliding handle can move in the axial direction relative to the fixed handle;

[0020] The slider is connected to the proximal end of the outer sheath tube, and the slider can move in the axial direction relative to the fixed handle and the sliding handle.

[0021] In one of the embodiments, a locking portion is provided on the slider, and the locking portion has a locked state and an unlocked state; when the locking portion is in the locked state, the positions of the slider and the sliding handle are relatively fixed; when the locking portion is in the unlocked state, the slider can move in the axial direction relative to the sliding handle.

[0022] The connection device of the present invention has a conveying component and a capturing component, and the capturing gap between the conveying component and the capturing component is used to accommodate the patient's autologous blood vessel. When the capturing component is in a released state, the autologous blood vessel can be made to enter the capturing gap by adjusting the position of the connecting device, and the autologous blood vessel can be clamped between the conveying component and the capturing component by converting the capturing component to a contracted state. In this way, the autologous blood vessel can be dragged into the artificial blood vessel, and finally the conveying component releases the bridging stent in the autologous blood vessel, and the two ends of the bridging stent are anchored to the artificial blood vessel and the autologous blood vessel respectively, thereby realizing a rapid connection between the autologous blood vessel and the artificial blood vessel. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the branch vessel freeing in the existing aortic arch replacement surgery;

[0024] Figure 2 This is a schematic diagram of the current aortic arch replacement surgery in which the branch vessels are sutured to the intraoperative stent;

[0025] Figure 3 is a three-dimensional diagram of the connecting device in Embodiment 1 of the present invention;

[0026] Figure 4 for Figure 3 The enlarged view of point A in the middle;

[0027] Figure 5 This is a front view of the capture component in Example 1 of the present invention in a released state;

[0028] Figure 6 It is a front view of the capture component in Example 1 of the present invention in a retracted state;

[0029] Figure 7 is a longitudinal cross-sectional view of the connecting device in Example 1 of the present invention;

[0030] Figure 8 for Figure 7 The enlarged view of point B in the middle;

[0031] Fig. 9This is a schematic diagram of the connection structure between the fixed handle and the inner sheath core in Example 1 of the present invention;

[0032] Fig.10 This is a schematic diagram of the connection structure between the movable handle and the stent sheath in Example 1 of the present invention;

[0033] Fig.11 This is a schematic diagram of the connection structure between the movable handle and the outer sheath tube in Example 1 of the present invention;

[0034] Fig.12 for Figure 7 Enlarged view of point C in the middle;

[0035] Fig.13 This is a schematic diagram of the connecting device in Example 1 of the present invention capturing an autologous blood vessel;

[0036] Fig.14 This is a schematic diagram of the connecting device in Example 1 of the present invention pulling an autologous blood vessel into an artificial blood vessel;

[0037] Fig.15 This is a schematic diagram of the capture component in Example 1 of the present invention when released in an artificial blood vessel;

[0038] Fig.16 This is a schematic diagram of the delivery assembly in Example 1 of the present invention releasing the bridging stent;

[0039] Fig.17 This is a schematic diagram of the connection structure between the bridging stent and the autologous blood vessel and the artificial blood vessel according to Example 1 of the present invention;

[0040] Fig.18 Schematic diagram of the connection structure between the capture component and the inner sheath tube in Example 2 of the present invention.

[0041] Fig.19 It is a front view of the capture component in Example 3 of the present invention;

[0042] Fig. 20 This is a front view of the capture component in Example 4 of the present invention. DETAILED DESCRIPTION

[0043] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0044] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0045] In order to more clearly describe the structure of the present application, the terms "proximal end" and "distal end" are defined herein as commonly used terms in the field of interventional medicine. Specifically, "distal end" refers to the end away from the operator during the surgical operation, "proximal end" refers to the end close to the operator during the surgical operation, "axial" refers to its length direction, and "radial" refers to the direction perpendicular to the "axial" direction.

[0046] Example 1

[0047] like Figure 3 As shown, this embodiment provides a connection device 1, including: a conveying component 11, which is used to convey and release the bridging stent 2 (see Figure 7 ); a capture component 12, the distal end of which is located outside the conveying component 11, and a capture gap 13 is provided between the capture component 12 and the outer peripheral surface of the distal end of the conveying component 11; the capture component 12 has a contracted state and a released state, and the capture gap 13 when the capture component 12 is in the contracted state is smaller than the capture gap 13 when the capture component 12 is in the released state.

[0048] The bridging stent 2 is used to connect the autologous blood vessel and the artificial blood vessel, for example Figure 2 The branch blood vessel 02 and branch stent 031 cut off during aortic arch replacement surgery. The connection device of this embodiment is used to capture the autologous blood vessel and release the bridging stent to connect the autologous blood vessel and the artificial blood vessel.

[0049] Specifically, there is a capture gap 13 between the capture component 12 in the released state and the conveying component 11, and the overall position of the connecting device 1 can be adjusted so that the end of the patient's autologous blood vessel (for example, the branch blood vessel 02 that was cut off during the aortic arch replacement surgery) can fall into the capture gap 13. That is, the conveying component 11 is located inside the autologous blood vessel, and the capture component 12 is located outside the autologous blood vessel. When the capture component 12 changes from the released state to the contracted state, the capture gap 13 becomes smaller, and the autologous blood vessel is clamped between the capture component 12 and the conveying component 11, so that the autologous blood vessel can be dragged into the artificial blood vessel (such as the branch stent 031). Finally, the conveying component 11 releases the bridging stent 2 in the autologous blood vessel, so that the bridging stent 2 anchors the artificial blood vessel and the autologous blood vessel together, thereby achieving a rapid connection between the autologous blood vessel and the artificial blood vessel.

[0050] Among them, the capture component 12 is arranged outside the delivery component 11, which can not only clamp the autologous blood vessel, but also pre-position, that is, when capturing the autologous blood vessel, the delivery component is already located in the autologous blood vessel, and the stent can be directly released after the autologous blood vessel is dragged into the artificial blood vessel and the capture component is released, which improves the continuity of the operation and shortens the operation time.

[0051] In this embodiment, if Figure 4 As shown, the capture component 12 includes four jaws 121, and the connecting device 1 also includes an outer sheath 14, and the outer sheath 14 can be axially movably mounted outside the conveying component 11. The outer sheath 14 can move axially relative to the capture component 12. As the outer sheath 14 is pushed toward the distal end, the jaws 121 gradually move toward the conveying component 11 under the pressure of the outer sheath 14, thereby narrowing the capture gap 13. The four jaws 121 are evenly distributed circumferentially outside the conveying component 11. Under the action of the outer sheath 14, the four jaws 121 can be opened or contracted at the same time. In other embodiments, the capture component may include one or more jaws 121. Or the distal ends of the jaws 121 are connected in series by a traction wire, and the traction wire is tightened to make the distal ends of the jaws 121 move radially inward. Alternatively, the capture component 12 may be in other shapes, such as a circle of wire sleeved outside the delivery component 11, with both ends of the wire gathered inside the outer sheath 14, and as the outer sheath 14 moves toward the distal end, the circle formed by the wire outside the delivery component 11 narrows inward. The specific structure of the capture component 12 of this embodiment is only one of the specific embodiments of the connecting device 1, and does not represent a limitation on the structure of the capture component 12. The capture component 12 only needs to be able to capture the autologous blood vessel so as to drag the autologous blood vessel into the artificial blood vessel.

[0052] Among them, in this embodiment, when the capture component 12 is in a released state, the distance between the distal end of the outer sheath tube 14 and the distal end of the clamp 121 is the farthest; as the outer sheath tube 14 moves distally relative to the clamp 121, the capture component 12 changes from a released state to a contracted state. When the capture component 12 is in the contracted state, the distance between the distal end of the outer sheath tube 14 and the clamp 121 is the shortest.

[0053] like Figure 5 As shown, the clamping jaw 121 includes a connecting section 1211 and a clamping section 1212; the angle between the connecting section 1211 and the central axis Z of the conveying assembly 11 is α; the angle between the clamping section 1212 and the central axis Z of the conveying assembly 11 is β; when the capture assembly 12 is in a released state, α>β. When the outer sheath 14 moves toward the distal end to squeeze the clamping jaw 121, the distal end of the connecting section 1211 rotates radially inward around its proximal end, and the clamping section 1212 connected to the distal end of the connecting section 1211 gradually moves toward the central axis Z of the outer sheath 14 as a whole. Providing the clamping section 1212 with a smaller inclination angle is conducive to increasing the contact area between the clamping jaw 121 and the autologous blood vessel, while improving the clamping stability of the autologous blood vessel, and can also avoid excessive concentration of the clamping force to damage the autologous blood vessel.

[0054] Preferably, if Figure 6 As shown, when the capture component 12 is in a converged state, the angle β between the inner side surface of the clamping section 1212 and the central axis of the conveying component 11 is equal to 0. The inner side surface of the clamping section 1212 refers to the surface facing the conveying component 11. At this time, the inner side surface of the clamping section 1212 is parallel to the central axis of the conveying component 11, and the size of the capture gap 13 from its proximal end to the distal end is consistent, and the clamping force received by the autologous blood vessel in the capture gap 13 is more uniform, thereby avoiding excessive concentration of the clamping force and damaging the autologous blood vessel.

[0055] like Figure 7 and Figure 8As shown, the delivery assembly 11 includes a stent sheath 111 and an inner sheath core 112; the inner sheath core 112 can be axially movably arranged in the stent sheath 111, and a receiving space is formed between the distal end of the inner sheath core 112 and the distal end of the stent sheath 111, and the bridging stent 2 is arranged in the receiving space. Among them, the main frame of the bridging stent 2 is made of memory metal, and the bridging stent 2 is pre-compressed and placed in the receiving space. After the bridging stent 2 is delivered to the treatment position by the delivery assembly 11, the stent sheath 111 is withdrawn to release the restraint of the stent sheath 111 on the bridging stent 2, and the bridging stent 2 is unfolded and supported on the blood vessel wall. Specifically in this embodiment, after the autologous blood vessel is dragged into the artificial blood vessel, the stent sheath 111 is withdrawn, the bridging stent 2 is unfolded and supported in the autologous blood vessel, and the autologous blood vessel is close to the artificial blood vessel under the radial force of the bridging stent 2, that is, the connection between the autologous blood vessel and the artificial blood vessel is completed. Preferably, the bridging bracket 2 includes a main frame and a coating attached to the main frame.

[0056] The capture component 12 is connected to the distal end of the stent sheath 111. Specifically, the four clamps 121 are evenly connected to the outer peripheral surface of the stent sheath 111 in the circumferential direction. As the stent sheath 111 is withdrawn, the capture component 12 is also withdrawn to prevent the capture component 12 from hindering the deployment of the bridging stent 2. The capture component 12 is fixedly connected to the stent sheath 111 by bonding or welding, thereby simplifying the structure of the connecting device 1, and can make the withdrawal of the capture component 12 and the release of the bridging stent 2 completed in one operation step, which is more convenient for doctors to operate.

[0057] like Figure 7 As shown, the connecting device 1 further includes a handle assembly 15 , and the handle assembly 15 includes a fixed handle 151 , a sliding handle 152 and a sliding block 153 .

[0058] like Fig. 9 As shown, the fixed handle 151 is connected to the proximal end of the inner sheath core 112; Fig.10 As shown, the sliding handle 152 is connected to the proximal end of the stent sheath 111, and the sliding handle 152 can move in the axial direction relative to the fixed handle 151; Fig.11 As shown, the slider 153 is connected to the proximal end of the outer sheath tube 14 , and the slider 153 can move in the axial direction relative to the fixed handle 151 and the sliding handle 152 .

[0059] The slider 153 has a locked state and an unlocked state; when the slider 153 is in the locked state, the positions of the slider 153 and the sliding handle 152 are relatively fixed, and the outer sheath 14 can move together with the clamp 121; when the slider 153 is in the unlocked state, the slider 153 can move in the axial direction relative to the sliding handle 152, and the outer sheath can move relative to the clamp 121. Fig.12 As shown, the slider 153 includes a first part 1531 and a second part 1532, the first part is fixedly connected to the outer sheath 14, and the second part 1532 is connected via an elastic member 154. Fig.10 and Fig.11 , a first tooth portion 1521 is disposed on the inner side of the sliding handle 152, and a second tooth portion 15321 corresponding to the first tooth portion 1521 is disposed on the second sub-section 1532. When the slider 153 is in a locked state, under the elastic force of the elastic member 154, the second tooth portion 15321 on the second sub-section 1532 meshes with the corresponding first tooth portion 1521, thereby preventing the slider 153 from moving relative to the sliding handle 152. When the slider 153 is subjected to pressure directed toward the central axis of the sliding handle 152 (the doctor presses the slider 153), the slider 153 is transformed into an unlocked state, the first tooth portion 1521 and the second tooth portion 15321 are disengaged, and the slider 153 can move along the sliding handle 152. Furthermore, two sliders 153 may be provided on the outer sheath tube 14 , and the two sliders 153 are symmetrically arranged about the central axis of the outer sheath tube 14 . Accordingly, two second teeth 15321 corresponding to the two sliders 153 are provided on the inner side of the sliding handle 152 .

[0060] It is understandable that the specific structure of the slider 153 in this embodiment does not represent a limitation on the structure of the connecting device 1. The slider 153 and the sliding handle 152 may adopt other structures as long as the slider 153 can be in a sliding state and a locked state. In other embodiments, a locking portion may be added, and the locking member is fixedly connected to the slider and moves with the slider. The sliding handle is provided with a plurality of positioning members extending along its axial direction. When the locking member is connected to one of the positioning members, the slider is in a locked state.

[0061] Since the slider 153 is in a locked state, the doctor can adjust the tightness of the capture device in real time according to the actual situation during the operation. For example, if the patient's blood vessel wall is thick, the doctor does not need to push the outer sheath 14 to the extreme position (i.e., the position when the distal end of the outer sheath 14 is closest to the distal end of the clamping jaw 121) when clamping the autologous blood vessel, but stops pushing the outer sheath 14 at any time and achieves locking according to the actual clamping degree of the autologous blood vessel. For another example, after the autologous blood vessel is dragged into the artificial blood vessel, when releasing the capture component 12, it is not necessary to pull the outer sheath 14 proximally to the extreme position (i.e., the position when the distal end of the outer sheath 14 is farthest from the distal end of the clamp 121), that is, it is not necessary to completely release the capture component 12. In this way, during the release of the bridging stent 2, the capture component 12 and the stent sheath 111 can still continue to limit the autologous blood vessel to a certain extent, thereby avoiding the displacement and wrinkling of the autologous blood vessel due to the instantaneous expansion of the bridging stent 2 when it is released, thereby avoiding uneven support force of the bridging stent 2 on the autologous blood vessel.

[0062] The process of connecting the autologous blood vessel and the artificial blood vessel by the connecting device 1 of this embodiment is as follows:

[0063] 1. If Fig.13 As shown, the capture component 12 is adjusted to a released state, and the position of the connecting device 1 is adjusted so that the cut end of the autologous blood vessel 3 falls into the capture gap 13 between the conveying component 11 and the capture component 12 .

[0064] 2. If Fig.14 As shown, unlock the slider 153 and push the slider 153 toward the distal end so that the outer sheath 14 squeezes the capture component 12 until the autologous blood vessel 3 is clamped in the capture gap 13, lock the slider 153 and withdraw the connecting device 1 as a whole to allow the autologous blood vessel 3 to enter the artificial blood vessel 4.

[0065] 3. If Fig.15 As shown, when the overlapping length L of the autologous blood vessel 3 and the artificial blood vessel 4 is 5 to 8 mm, the slider 153 is unlocked and pulled toward the proximal end to withdraw the outer sheath 14 to release the capture component 12.

[0066] 4. If Fig.16 As shown, the slider 153 is locked, and the sliding handle 152 is pulled proximally relative to the fixed handle 151 to withdraw the outer sheath 14 and the stent sheath 111 until the bridging stent 2 is completely released.

[0067] 5. If Fig.17 As shown, the connecting device 1 is withdrawn as a whole to complete the connection between the autologous blood vessel 3 and the artificial blood vessel 4.

[0068] Example 2

[0069] The main difference between the connection device disclosed in Example 2 and Example 1 is that Fig.18 As shown, the connection device in Example 2 further includes an inner sheath tube 56, which is axially movable and sleeved outside the conveying component 51, and the capture component 52 is connected to the end of the inner sheath tube 56. The connection device in Example 2 can adjust the relative position of the capture component 52 and the conveying component 51 in the axial direction as needed.

[0070] Example 3

[0071] The main difference between the connection device disclosed in Example 3 and Example 1 is that Fig.19 As shown, a buffer 622 is connected to the distal end of the clamping jaw 621 in Embodiment 3, facing the central axis Y of the capture assembly 62. The buffer 622 is made of a soft, biocompatible material, such as silicone, rubber, and the like.

[0072] Due to the existence of the buffer 622, the clamping jaws with a certain rigidity will not directly contact the autologous blood vessel, but the buffer will contact the autologous blood vessel, thereby preventing the clamping jaws from damaging the autologous blood vessel. The buffer 622 made of the above material also has an anti-slip effect.

[0073] In this embodiment, the surface of the buffer component in contact with the autologous blood vessel is a curved surface, which further reduces the scratches and damages to the autologous blood vessel caused by the edges.

[0074] Example 4

[0075] The main difference between the connection device disclosed in Example 4 and Example 1 is that Fig. 20 As shown, in Example 4, a wrapping structure 722 is connected between two adjacent clamping jaws 721, and the wrapping structure 722 shrinks when the capturing component 72 is in a contracted state, and expands when the capturing component 72 is in a released state.

[0076] In this embodiment, the wrapping structure 722 is a mesh structure woven from metal wires or polylactic acid wires. When the autologous blood vessel is clamped in the capture gap, part of the autologous blood vessel may be squeezed and protrude between the two clamps 721. When the autologous blood vessel protrudes too much between the two clamps 721, the protruding part of the autologous blood vessel may collide with the end of the artificial blood vessel during the process of dragging the autologous blood vessel into the artificial blood vessel, thereby causing damage to the autologous blood vessel and taking time to adjust the position of the connecting device. The wrapping structure 722 can be opened as the capture component 72 is opened, and can be contracted as the capture component 72 is contracted. The wrapping structure 722 can prevent the autologous blood vessel from protruding from between the two clamps 721, better wrap the autologous blood vessel, and enable the autologous blood vessel to be smoothly dragged into the artificial blood vessel.

[0077] In other embodiments, the wrapping structure may also be a film, such as a silicone film, a polytetrafluoroethylene film, etc.

[0078] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0079] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A connection device, characterized in that: include: a delivery assembly for delivering and releasing the bridging stent; A capture component, wherein the distal end of the capture component is located outside the conveying component, and a capture gap is formed between the capture component and the outer peripheral surface of the distal end of the conveying component; The capture component has a contracted state and a released state, and a capture gap when the capture component is in the contracted state is smaller than a capture gap when the capture component is in the released state.

2. The connection device according to claim 1, characterized in that: The delivery assembly comprises a stent sheath and an inner sheath core; the inner sheath core is axially movable in the stent sheath, a receiving space is formed between the distal end of the inner sheath core and the distal end of the stent sheath, and the bridging stent is arranged in the receiving space; The capture component is connected to the distal end side of the stent sheath.

3. The connection device according to claim 1, characterized in that: The connecting device also includes an inner sheath tube, which is axially movably sleeved outside the conveying component, and the capturing component is connected to the end of the inner sheath tube.

4. The connection device according to claim 2 or 3, characterized in that: The connecting device further comprises an outer sheath tube, and the outer sheath tube is axially movable and sleeved outside the conveying assembly; The capture assembly includes at least one clamping claw, the end of the outer sheath tube abuts against the clamping claw, and the outer sheath tube radially presses the clamping claw inward when it moves toward the distal end relative to the clamping claw under the action of external force.

5. The connection device according to claim 4, characterized in that: The clamping jaw comprises a connecting section and a clamping section, wherein the proximal end of the clamping section is connected to the distal end of the connecting section; The angle between the connecting section and the central axis of the conveying component is α, the angle between the clamping section and the central axis of the conveying component is β, and α>β.

6. The connection device according to claim 3, characterized in that: When the capture assembly is in a contracted state, an angle β between the inner side surface of the clamping section and the central axis of the conveying assembly is equal to 0.

7. The connection device according to claim 4, characterized in that: A buffer is connected to a side of the distal end of the clamping claw facing the inner sheath tube.

8. The connection device according to claim 4, characterized in that: A wrapping structure is connected between two adjacent clamping claws. The wrapping structure contracts when the capture component is in a contracted state, and expands when the capture component is in a released state.

9. The connection device according to claim 4, characterized in that: The connecting device further comprises a handle assembly, wherein the handle assembly comprises a fixed handle, a sliding handle and a sliding block; The fixed handle is connected to the proximal end of the inner sheath core; The sliding handle is connected to the proximal end of the stent sheath, and the sliding handle can move in the axial direction relative to the fixed handle; The slider is connected to the proximal end of the outer sheath tube, and the slider can move in the axial direction relative to the fixed handle and the sliding handle.

10. The connection device according to claim 9, characterized in that The slider has a locked state and an unlocked state; when the slider is in the locked state, the positions of the slider and the sliding handle are relatively fixed; when the slider is in the unlocked state, the slider can move in the axial direction relative to the sliding handle.

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