A connection device

Abstract

The present application relates to a connecting device, which comprises a delivery assembly for delivering and releasing a bridging stent; a capturing assembly, the distal end of which is located outside the delivery assembly, and which has a capturing gap with the outer peripheral surface of the distal end of the delivery assembly; the capturing assembly has a retracted state and a released state, and the capturing gap in the retracted state of the capturing assembly is smaller than the capturing gap in the released state of the capturing assembly. The capturing gap is used to accommodate and clamp a patient's autologous blood vessel, so that the autologous blood vessel can be pulled into an artificial blood vessel, and finally the delivery assembly releases the bridging stent in the autologous blood vessel, and the two ends of the bridging stent are anchored with the artificial blood vessel and the autologous blood vessel respectively, thereby realizing the rapid connection of the autologous blood vessel and the artificial blood vessel.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of medical devices, in particular to a connecting device. BACKGROUND

[0002] Aortic dissection is an acute aortic disease with rapid onset, rapid progression, high mortality, high surgical difficulty and poor prognosis. The pathophysiology of aortic dissection is that the intima of the aorta ruptures, blood flows into the middle layer of the aorta, causing the middle layer of the aorta to split to form true and false lumens. In the existing medical technology, patients with Stanford type A aortic dissection with full-length aortic (including ascending aorta, aortic arch, descending aorta and abdominal aorta) lesions generally adopt aortic arch replacement surgery. The aortic arch of the human body is connected with three branch blood vessels, namely the left subclavian artery, the left common carotid artery and the innominate artery, which ensure normal blood supply to the upper limbs and the brain. As shown in Figure 1 , the aortic arch replacement surgery needs to cut off the connection between the aortic arch 01 and the branch blood vessels 02, and maintain the blood supply to the upper limbs and the brain by using extracorporeal circulation, as shown in Figure 2 , after implanting the intraoperative stent 03, the operator aligns the branch blood vessels 02 of the patient and the section of the intraoperative stent 03 and then connects them. The difficulty of the surgery is to successfully connect the branch stent 031 of the intraoperative stent with the corresponding branch blood vessels 02, so that the branch blood vessels do not shift and slip during the surgery and after the surgery. If the branch of the intraoperative stent shifts or even detaches from the branch blood vessels, it will cause serious consequences. In some surgeries, the three branches of the aortic arch are cut off first and then connected with the intraoperative stent. At present, the branches of the intraoperative stent and the corresponding branch blood vessels are mainly connected by manual suture and with the help of connecting members such as rolled tape. These connection methods require high proficiency of the doctor and a long surgery time. The long-time free connection of the branch blood vessels will increase the probability of brain, internal organ and limb injury of the patient. SUMMARY

[0003] Therefore, it is necessary to provide a medical device capable of quickly anastomosing the intraoperative stent and the patient's autologous blood vessels during the surgery.

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

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

[0006] a capture assembly, a distal end of the capture assembly being located outside the delivery assembly, and the capture assembly and an outer peripheral surface of a distal end portion of the delivery assembly having a capture gap therebetween;

[0007] the capture assembly has a retracted state and a released state, and the capture gap when the capture assembly is in the retracted state is smaller than the capture gap when the capture assembly is in the released state.

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

[0009] The capturing assembly comprises at least one jaw, when the capturing assembly is in the sheathing state, the proximal end of at least the jaw is located inside the outer sheath; when the capturing assembly is in the releasing state, the jaw is located outside the outer sheath.

[0010] In one embodiment, the jaw comprises a connecting section and a clamping section; the angle between the connecting section and the central axis of the inner sheath is α; the angle between the clamping section and the central axis of the inner sheath is β; when the capturing assembly is in the releasing state, α>β.

[0011] In one embodiment, when the capturing assembly is in the sheathing state, the angle β between the inner side of the clamping section and the central axis of the inner sheath is equal to 0.

[0012] In one embodiment, the side of the clamping section towards the inner sheath is connected with a buffer.

[0013] In one embodiment, a wrapping structure is connected between two adjacent jaws, which is contracted when the capturing assembly is in the sheathing state, and is expanded when the capturing assembly is in the releasing state.

[0014] In one embodiment, the delivery assembly comprises a stent sheath and an inner sheath core; the inner sheath core is axially movably arranged inside the stent sheath, a containing 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 containing space.

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

[0016] In one embodiment, the capturing assembly further comprises an inner sheath, which is axially movably sleeved outside the delivery assembly, and the jaw is connected to the end of the inner sheath.

[0017] In one embodiment, the connecting device further comprises a handle assembly, which 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 is movable in the axial direction relative to the fixed handle.

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

[0021] In one embodiment, the slider is provided with a locking portion, which has a locked state and an unlocked state; when the locking portion is in the locked state, the position of the slider is fixed relative to the sliding handle; when the locking portion is in the unlocked state, the slider is movable in the axial direction relative to the sliding handle.

[0022] The connecting device has a delivery assembly and a capturing assembly, and a capturing gap between the delivery assembly and the capturing assembly is used to accommodate a patient's autologous blood vessel. When the capturing assembly is in a released state, the autologous blood vessel can be brought into the capturing gap by adjusting the position of the connecting device, and the autologous blood vessel is clamped between the delivery assembly and the capturing assembly by converting the capturing assembly into a converging state. Thus, the autologous blood vessel can be pulled into an artificial blood vessel, and finally the delivery assembly releases a bridging stent in the autologous blood vessel, and the two ends of the bridging stent are anchored with the artificial blood vessel and the autologous blood vessel respectively, so as to realize rapid connection of the autologous blood vessel and the artificial blood vessel. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 A schematic diagram for freeing a branch blood vessel in a conventional aortic arch replacement surgery;

[0024] Figure 2 A schematic diagram for suturing a branch blood vessel to an intraoperative stent in a conventional aortic arch replacement surgery;

[0025] Figure 3 A perspective view of the connecting device in Embodiment 1 of the present application;

[0026] Figure 4 A perspective view of the connecting device in Embodiment 1 of the present application; Figure 3 A perspective view of the connecting device in Embodiment 1 of the present application;

[0027] Figure 5 A front view of the capturing assembly in Embodiment 1 of the present application in a released state;

[0028] Figure 6 A front view of the capturing assembly in Embodiment 1 of the present application in a converging state;

[0029] Figure 7 A longitudinal sectional view of the connecting device in Embodiment 1 of the present application;

[0030] Figure 8 A longitudinal sectional view of the connecting device in Embodiment 1 of the present application; Figure 7 A longitudinal sectional view of the connecting device in Embodiment 1 of the present application;

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

[0032] Figure 10 Fig. 2 is a schematic diagram of the connection structure between the movable handle and the support sheath in the embodiment 1 of the present application;

[0033] Figure 11 Fig. 3 is a schematic diagram of the connection structure between the movable handle and the outer sheath in the embodiment 1 of the present application;

[0034] Figure 12 Fig. 4 is a schematic diagram of the connection structure between the bridge support and the autologous blood vessel in the embodiment 1 of the present application; Figure 7 Fig. 5 is an enlarged view of the position C in Fig. 4;

[0035] Figure 13 Fig. 6 is a schematic diagram of the connection device capturing the autologous blood vessel in the embodiment 1 of the present application;

[0036] Figure 14 Fig. 7 is a schematic diagram of the connection device dragging the autologous blood vessel into the artificial blood vessel in the embodiment 1 of the present application;

[0037] Figure 15 Fig. 8 is a schematic diagram of the capturing assembly releasing in the artificial blood vessel in the embodiment 1 of the present application;

[0038] Figure 16 Fig. 9 is a schematic diagram of the delivery assembly releasing the bridge support in the embodiment 1 of the present application;

[0039] Figure 17 Fig. 10 is a schematic diagram of the connection structure between the bridge support and the autologous blood vessel, the artificial blood vessel in the embodiment 1 of the present application;

[0040] Figure 18 Fig. 11 is a schematic diagram of the connection structure between the capturing assembly and the inner sheath in the embodiment 2 of the present application.

[0041] Figure 19 Fig. 12 is a front view of the capturing assembly in the embodiment 3 of the present application;

[0042] Figure 20 Fig. 13 is a front view of the capturing assembly in the embodiment 4 of the present application. DETAILED DESCRIPTION

[0043] In order to make the purpose, technical scheme and advantages of the present application clearer, the present application is further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application, and are not used to limit the present application.

[0044] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description herein is for describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and / or" includes any and all combinations of one or more of the associated 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 terms commonly used in the field of interventional medicine. Specifically, "distal end" refers to the end that is far from the operator during the operation, "proximal end" refers to the end that is close to the operator during the operation, "axial direction" refers to the length direction, and "radial direction" refers to the direction perpendicular to the "axial direction".

[0046] Embodiment 1

[0047] As shown in Figure 3 , the present embodiment provides a connecting device 1, comprising: a delivery assembly 11 for delivering and releasing a bridging stent 2 (see Figure 7 ); a capturing assembly 12, the distal end of which is located outside the delivery assembly 11, and the capturing assembly 12 has a capturing gap 13 with the outer peripheral surface of the distal end of the delivery assembly 11; the capturing assembly 12 has a constricted state and a released state, and the capturing gap 13 of the capturing assembly 12 in the constricted state is smaller than the capturing gap 13 of the capturing assembly 12 in the released state.

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

[0049] Specifically, a capture gap 13 exists between the capture component 12 in the released state and the delivery component 11. Adjusting the overall position of the connecting device 1 allows the end of the patient's autologous blood vessel (e.g., a branch vessel 02 severed during aortic arch replacement surgery) to enter the capture gap 13. That is, the delivery 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 retracted state, the capture gap 13 decreases, and the autologous blood vessel is clamped between the capture component 12 and the delivery component 11, allowing the autologous blood vessel to be pulled into the artificial blood vessel (e.g., the branch stent 031). Finally, the delivery component 11 releases the bridging stent 2 within the autologous blood vessel, anchoring the artificial blood vessel and the autologous blood vessel together, thereby achieving a rapid connection between the autologous and artificial blood vessels.

[0050] The capture component 12, located outside the delivery component 11, not only clamps the autologous blood vessel but also pre-positions it. That is, when the autologous blood vessel is captured, the delivery component is already inside the autologous blood vessel. After the autologous blood vessel is pulled into the artificial blood vessel and the capture component is released, the stent can be released directly, which improves the continuity of the operation and shortens the operation time.

[0051] In this embodiment, as Figure 4 As shown, the capturing assembly 12 includes four grippers 121, and the connecting device 1 further includes an outer sheath 14, which is axially movable and fitted onto the conveying assembly 11. The outer sheath 14 can move axially relative to the capturing assembly 12. As the outer sheath 14 is pushed distally, the grippers 121 gradually move towards the conveying assembly 11 under the pressure of the outer sheath 14, thereby narrowing the capturing gap 13. The four grippers 121 are circumferentially and evenly distributed outside the conveying assembly 11. Under the action of the outer sheath 14, the four grippers 121 can open or close simultaneously. In other embodiments, the capturing assembly may include one or more grippers 121. Alternatively, the distal ends of the grippers 121 are connected by traction wires, and tightening the traction wires causes the distal ends of the grippers 121 to move radially inward. Alternatively, the capturing component 12 can be of other shapes, such as a loop of metal wire fitted around the delivery component 11, with both ends of the wire constricted within the outer sheath 14. As the outer sheath 14 moves distally, the loop formed by the metal wire around the delivery component 11 narrows inward. The specific structure of the capturing component 12 in this embodiment is merely one specific embodiment of the connecting device 1 and does not represent a limitation on the structure of the capturing component 12. The capturing component 12 only needs to be able to capture autologous blood vessels so that they can be pulled into the artificial blood vessel.

[0052] In this embodiment, when the capture component 12 is in the released state, the distance between the distal end of the outer sheath 14 and the distal end of the gripper 121 is the farthest; as the outer sheath 14 moves distally relative to the gripper 121, the capture component 12 changes from the released state to the retracted state, and when the capture component 12 is in the retracted state, the distance between the distal end of the outer sheath 14 and the gripper 121 is the shortest.

[0053] like Figure 5 As shown, the gripper 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 delivery assembly 11 is α; the angle between the clamping section 1212 and the central axis Z of the delivery assembly 11 is β; when the capture assembly 12 is in the released state, α > β. When the outer sheath 14 moves distally to compress the gripper 121, the distal end of the connecting section 1211 rotates radially inward about its proximal end, and the clamping section 1212 connected to the distal end of the connecting section 1211 gradually moves towards the central axis Z of the outer sheath 14. The clamping section 1212, with its smaller tilt angle, increases the contact area between the gripper 121 and the autologous blood vessel, improving the clamping stability of the autologous blood vessel while preventing excessive concentration of clamping force that could damage the autologous blood vessel.

[0054] Preferably, such as Figure 6 As shown, when the capture component 12 is in the contracted state, the angle β between the inner surface of the clamping segment 1212 and the central axis of the delivery component 11 is equal to 0. Here, the inner surface of the clamping segment 1212 refers to the surface facing the delivery component 11. At this time, the inner surface of the clamping segment 1212 is parallel to the central axis of the delivery component 11, and the capture gap 13 has a consistent size from its proximal end to its distal end. The clamping force received by the autologous blood vessel within the capture gap 13 is more uniform, thereby avoiding excessive concentration of clamping force and potential damage to 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 is axially movable within 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. The bridging stent 2 is disposed within the receiving space. The main frame of the bridging stent 2 is made of shape memory metal. The bridging stent 2 is pre-compressed and placed within the receiving space. After the delivery assembly 11 delivers the bridging stent 2 to the treatment position, the stent sheath 111 is retracted to release the constraint of the stent sheath 111 on the bridging stent 2. The bridging stent 2 then unfolds and is supported against the blood vessel wall. Specifically, in this embodiment, after the autologous blood vessel is inserted into the artificial blood vessel, the stent sheath 111 is retracted, and the bridging stent 2 unfolds and is supported within the autologous blood vessel. Under the radial force of the bridging stent 2, the autologous blood vessel adheres tightly to the artificial blood vessel, thus completing the connection between the autologous blood vessel and the artificial blood vessel. Preferably, the bridging bracket 2 includes a main frame and a film attached to the main frame.

[0056] The capture assembly 12 is connected to the distal end of the stent sheath 111. Specifically, four grippers 121 are evenly connected to the outer circumferential surface of the stent sheath 111 in the circumferential direction. As the stent sheath 111 is retracted, the capture assembly 12 also retracts, preventing the capture assembly 12 from obstructing the deployment of the bridging stent 2. The capture assembly 12 is fixedly connected to the stent sheath 111 by adhesive or welding, thus simplifying the structure of the connection device 1 and allowing the retraction of the capture assembly 12 and the release of the bridging stent 2 to be completed in one operation step, making it easier for doctors to operate.

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

[0058] like Figure 9 As shown, the fixed handle 151 is connected to the proximal end of the inner sheath core 112; as Figure 10 As shown, the sliding handle 152 is connected to the proximal end of the support sheath 111, and the sliding handle 152 can move axially relative to the fixed handle 151; as Figure 11 As shown, the slider 153 is connected to the proximal end of the outer sheath 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 slider 153 and the sliding handle 152 are relatively fixed in position, and the outer sheath 14 can move together with the gripper 121; when the slider 153 is in the unlocked state, the slider 153 can move axially relative to the sliding handle 152, and the outer sheath can move relative to the gripper 121. In this embodiment, as... Figure 12 As shown, the slider 153 includes a first portion 1531 and a second portion 1532. The first portion is fixedly connected to the outer sheath 14, and the second portion 1532 is connected via an elastic element 154. (See previous text) Figure 10 and Figure 11 The inner side of the sliding handle 152 is provided with a first tooth 1521, and the second portion 1532 is provided with a second tooth 15321 corresponding to the first tooth 1521. When the slider 153 is in the locked state, under the elastic force of the elastic member 154, the second tooth 15321 on the second portion 1532 engages with its corresponding first tooth 1521, thereby preventing the slider 153 from moving relative to the sliding handle 152. When the slider 153 is subjected to pressure pointing towards the central axis of the sliding handle 152 (when a doctor presses the slider 153), the slider 153 changes to the unlocked state, the first tooth 1521 and the second tooth 15321 disengage, and the slider 153 can move along the sliding handle 152. Furthermore, two sliders 153 can 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. Correspondingly, two second teeth 15321 corresponding to the two sliders 153 are provided on the inner side of the sliding handle 152.

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

[0061] Because the slider 153 has 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 where the distal end of the outer sheath 14 is closest to the distal end of the clamp 121) when clamping the autologous blood vessel. Instead, the doctor can stop pushing the outer sheath 14 at any time and lock it according to the actual degree of clamping of the autologous blood vessel. For example, after the autologous blood vessel is pulled into the artificial blood vessel, when the capture component 12 is released, it is not necessary to pull the outer sheath 14 to the limit position (i.e., the position where the distance between the distal end of the outer sheath 14 and the distal end of the clamp 121 is the farthest), 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 continuously limit the autologous blood vessel to a certain extent, avoiding displacement and wrinkling of the autologous blood vessel due to the instantaneous unfolding of the bridging stent 2 during release, thereby avoiding uneven support force of the bridging stent 2 on the autologous blood vessel.

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

[0063] 1. For example Figure 13 As shown, the capture component 12 is adjusted to the 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 delivery component 11 and the capture component 12.

[0064] 2. For example Figure 14 As shown, the slider 153 is unlocked and pushed distally to cause the outer sheath 14 to squeeze the capture assembly 12 until the autologous blood vessel 3 is clamped in the capture gap 13. Then, the slider 153 is locked and the connecting device 1 is withdrawn as a whole to allow the autologous blood vessel 3 to enter the artificial blood vessel 4.

[0065] 3. For example Figure 15 As shown, when the overlap length L between the autologous blood vessel 3 and the artificial blood vessel 4 is 5~8mm, the slider 153 is unlocked and the slider 153 is pulled proximally to retract the outer sheath 14 to release the capture assembly 12.

[0066] 4. For example Figure 16 As shown, with the slider 153 in a locked state, the sliding handle 152 is pulled proximally relative to the fixed handle 151, and then the outer sheath 14 and the support sheath 111 are retracted until the bridging support 2 is completely released.

[0067] 5. For example Figure 17 As shown, the connecting device 1 is retracted 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 Embodiment 2 and the connection device disclosed in Embodiment 1 is that, as Figure 18 As shown, the connecting device in Embodiment 2 further includes an inner sheath 56, which is axially movable and fitted over the conveying assembly 51. The capturing assembly 52 is connected to the end of the inner sheath 56. The connecting device in Embodiment 2 can adjust the relative position of the capturing assembly 52 and the conveying assembly 51 in the axial direction as needed.

[0070] Example 3

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

[0072] Because of the presence of the buffer 622, the rigid grippers do not directly contact the autologous blood vessels; instead, the buffer contacts the autologous blood vessels, preventing damage from the grippers. The buffer 622, made of the aforementioned material, also has an anti-slip function.

[0073] In this embodiment, the surface of the buffer that contacts the autologous blood vessel is an arc surface, which further reduces the scraping and damage of the edge to the autologous blood vessel.

[0074] Example 4

[0075] The main difference between Embodiment 4 and the connection device disclosed in Embodiment 1 is that, as Figure 20 As shown, in Embodiment 4, a wrapping structure 722 is connected between two adjacent grippers 721. The wrapping structure 722 contracts when the capture component 72 is in a contracted state and unfolds when the capture 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 filaments. 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. If too much of the autologous blood vessel protrudes between the two clamps 721, the protruding part may abut against the end of the artificial blood vessel during the process of pulling the autologous blood vessel into the artificial blood vessel, thus causing damage to the autologous blood vessel and requiring time to adjust the position of the connecting device. The wrapping structure 722 can open as the capture component 72 opens and close as the capture component 72 closes. The wrapping structure 722 can prevent the autologous blood vessel from protruding between the two clamps 721, better wrap the autologous blood vessel, and allow the autologous blood vessel to be smoothly pulled into the artificial blood vessel.

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

[0078] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above 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 embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A connecting device, characterized in that, include: A delivery assembly for delivering and releasing a bridging stent, such that both ends of the bridging stent are anchored to an artificial blood vessel and an autologous blood vessel, respectively. The delivery assembly includes a stent sheath and an inner sheath core, the inner sheath core being axially movable within 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, the receiving space being used to receive the bridging stent. A capture component, the distal end of which is located outside the delivery component, and a capture gap is provided between the outer peripheral surfaces of the capture component and the distal end of the delivery component for accommodating the patient's autologous blood vessels and pulling the autologous blood vessels into the artificial blood vessel; The connecting device further includes an outer sheath tube, which is axially movable and fitted outside the conveying assembly. The outer sheath tube is movable relative to the capturing assembly in the axial direction, so that the capturing assembly has a contracted state and a released state. The capturing gap of the capturing assembly in the contracted state under the compression of the outer sheath tube is smaller than the capturing gap of the capturing assembly in the released state.

2. The connecting device according to claim 1, characterized in that, The capture component is connected to the distal end of the stent sheath.

3. The connecting device according to claim 1, characterized in that, The connecting device also includes an inner sheath tube, which is axially movable and fitted outside the delivery assembly, and the capture assembly is connected to the end of the inner sheath tube.

4. The connecting device according to claim 3, characterized in that, The capture assembly includes at least one gripper, the end of the outer sheath abuts against the gripper, and the outer sheath radially inwards compresses the gripper when it moves distally relative to the gripper under the action of an external force.

5. The connecting device according to claim 4, characterized in that, The gripper includes 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 assembly is α, and the angle between the clamping section and the central axis of the conveying assembly is β, where α > β.

6. The connecting device according to claim 5, characterized in that, When the capturing component is in the contracted state, the angle β between the inner side of the clamping segment and the central axis of the conveying component is equal to 0.

7. The connecting device according to claim 4, characterized in that, A buffer is connected to the distal end of the gripper on the side facing the inner sheath.

8. The connecting device according to claim 4, characterized in that, A wrapping structure is connected between two adjacent grippers, which contracts when the capture assembly is in a contracted state and expands when the capture assembly is in a released state.

9. The connecting device according to claim 4, characterized in that, The connecting device further includes a handle assembly, which includes a fixed handle, a sliding handle, and a slider. 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 support sheath, and the sliding handle can move axially relative to the fixed handle; The slider is connected to the proximal end of the outer sheath and is movable in the axial direction relative to the fixed handle and the sliding handle.

10. The connecting 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 position of the slider and the sliding handle is 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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