A blood vessel suturing device for minimally invasive cardiac surgery

Abstract

The present application relates to the technical field of medical devices, in particular to a blood vessel suturing device for minimally invasive cardiac surgery, comprising a catheter, a first sleeve, a second sleeve, suturing needles, suturing threads, a driving assembly, a third sleeve and a thread pressing block, the first sleeve is sleeved on the outside of the catheter, and the second sleeve is sleeved on the outside of the first sleeve.The present application is provided with a second sleeve and a suturing needle, when suturing the wound around the blood vessel, multiple suturing needles are first dispersed equidistantly on the outside of the wound and then pass out from the inside to the outside of the blood vessel, so that the stitches of the suturing thread can be uniformly distributed around the wound of the blood vessel, and the second sleeve will not rotate relative to the wound of the blood vessel during the suturing process of the wound of the patient, so the blood vessel wall is not easy to be twisted around the force, so that the suturing position of the blood vessel will not form irregular inner wall of the blood vessel due to the mutual extrusion of the blood vessel wall, thereby reducing the risk of postoperative thrombosis and reducing the postoperative safety hazard.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and in particular to a vascular suture device for minimally invasive cardiac surgery. Background Technology

[0002] Vascular suture devices are commonly used medical instruments in minimally invasive cardiac surgery. Existing vascular suture devices are typically integrated into a catheter inserted into the patient's artery. They are used to suture the wound in the artery as the catheter is removed. The main components of a vascular suture device include a suture block, a suture needle, and a suture. The suture block rotates within a groove on the catheter's peripheral wall. The suture needle slides on the catheter and can be driven to move along its axis. The suture passes through the suture hole of the suture needle. When suturing a wound, the doctor first controls the suture needle to move it downwards and insert it into the artery, so that the suture is clamped on the pressure block. Then, the doctor controls the suture needle to move upwards alone until it is removed from the artery. Next, the doctor controls the catheter to rotate at a certain angle, and then controls the suture needle to move downwards, so that the pressure block is released and the suture is threaded onto the suture needle again. Next, the doctor controls the suture needle to move it upwards until it is removed from the artery. At this time, the end of the suture comes out with the suture needle. The doctor then repeats the above operation until sutures are inserted around the wound. Then, the doctor removes the catheter from the artery and tightens the two ends of the suture to close the wound. Finally, the suture is tied, thus completing the suturing of the wound.

[0003] However, the aforementioned vascular suture device has the following problems in actual use: Because the arterial wall has good elasticity, when the catheter is inserted into the arterial blood vessel, the arterial wall and the peripheral wall of the catheter are in a state of close contact. When the doctor rotates the catheter, the arterial wall is easily twisted circumferentially by force. This causes the suture stitches to not be evenly distributed around the circumference of the catheter. As a result, the suture site of the arterial wall is formed by the mutual compression of the blood vessel walls, resulting in an irregular inner wall of the blood vessel. When plasma flows through this location, turbulence is easily generated, increasing the risk of thrombosis and posing a safety hazard to the patient's health. Summary of the Invention

[0004] Therefore, it is necessary to provide a vascular suture device for minimally invasive cardiac surgery to address the problems existing in current vascular suture devices, and to solve the problem that the suture stitches cannot be evenly distributed when suturing vascular wounds.

[0005] The above objectives are achieved through the following technical solutions:

[0006] A vascular suture device for minimally invasive cardiac surgery includes:

[0007] catheter;

[0008] The first sleeve is fixedly fitted onto the outside of the conduit;

[0009] The second sleeve is slidably fitted onto the outside of the first sleeve;

[0010] Suture needles, there are multiple suture needles, and the multiple suture needles are circumferentially spaced at equal intervals on the lower outer peripheral wall of the second sleeve;

[0011] The suture thread passes through each suture needle in sequence. Both ends of the suture thread enter the second sleeve from the bottom and exit from the top of the second sleeve. The two ends of the suture thread are connected to the upper outer peripheral wall of the second sleeve.

[0012] The suture needle has a first state and a second state. In the first state, the needle tips of multiple suture needles are facing downwards and are circumferentially gathered to the periphery of the second cannula. In the second state, the multiple suture needles are circumferentially dispersed to the periphery of the third cannula, and the needle tips of the suture needles are facing upwards and pass out from inside the blood vessel.

[0013] A drive component is used to drive the suture needle to switch between a first state and a second state.

[0014] The third sleeve is slidably sleeved outside the second sleeve;

[0015] There are multiple suture blocks, which are circumferentially spaced on the outer wall of the third sleeve and located above the suture needle. The suture blocks are used to hold the needle tip of the suture needle that passes through the blood vessel.

[0016] Preferably, the drive assembly includes a gear, a rotating rod, a connecting end, and a first elastic element. The gear is rotatably disposed at the lower part of the second sleeve. One end of the rotating rod is fixedly connected to the outer periphery of the gear. The connecting end is rotatably connected to the end of the rotating rod away from the gear. The first elastic element is disposed inside the connecting end. The suture needle is elastically engaged inside the connecting end through the first elastic element. When the elastic deformation of the first elastic element is greater than a preset value, the suture needle is disengaged from the connecting end.

[0017] Preferably, a limit baffle is provided at the end of the rotating rod that is rotatably connected to the connecting end.

[0018] Preferably, the first elastic element is an elastic metal ring, and the middle part of the elastic metal ring arches towards the position of its axis.

[0019] The suture needle has an annular groove on its outer periphery at the tail portion, with the center of the annular groove recessed inward.

[0020] The elastic metal ring fits into the annular groove.

[0021] Preferably, the drive assembly further includes a first rotating ring, a first fixed ring, a second elastic element, and racks. Multiple racks are circumferentially spaced at equal intervals on the lower outer periphery of the first sleeve. Each rack corresponds to and meshes with a gear. The first rotating ring is coaxially threaded to the upper part of the first sleeve. The first fixed ring is coaxially disposed outside the second sleeve and located below the first rotating ring. The second elastic element is sleeved outside the second sleeve, with its lower end resting on the first fixed ring and its upper end elastically abutting against the first rotating ring.

[0022] Preferably, a limiting post is provided on the outside of the first fixing ring, and the two ends of the suture thread that pass through the second sleeve are tied together and hung on the outside of the limiting post.

[0023] Preferably, a limiting groove is formed on the inner peripheral wall of the second sleeve, the limiting groove extends along the axial direction of the second sleeve, and a limiting protrusion is correspondingly provided on the outer peripheral wall of the first sleeve, the limiting protrusion being slidably connected in the limiting groove.

[0024] Preferably, the lower part of the pressure block is provided with a locking groove, the outer dimensions of which are adapted to the size of the needle tip of the suture needle.

[0025] Preferably, one end of the pressure block is rotatably mounted on the outer peripheral wall of the third sleeve, and a guide arc is provided on the lower part of the pressure block and the side near the locking groove.

[0026] Preferably, the upper end of the conduit extends out from the first sleeve.

[0027] The beneficial effects of this invention are:

[0028] This invention incorporates a second cannula and suture needles. When suturing around a blood vessel wound, multiple suture needles are initially evenly spaced circumferentially outside the wound and then emerge from inside the blood vessel. This ensures that the suture needles are evenly distributed around the wound. During suturing, the second cannula does not rotate relative to the blood vessel wound, thus preventing the blood vessel wall from being easily twisted circumferentially. Consequently, the suture site does not experience irregular inner wall formation due to mutual compression of the blood vessel walls, reducing the risk of postoperative thrombosis and minimizing postoperative safety hazards. Attached Figure Description

[0029] Figure 1 This is an overall schematic diagram of a vascular suture device for minimally invasive cardiac surgery according to the present invention;

[0030] Figure 2 for Figure 1 A magnified schematic diagram of the structure at point A in the middle;

[0031] Figure 3 for Figure 1A magnified schematic diagram of the structure at point B in the middle;

[0032] Figure 4 This is a cross-sectional view of a vascular suture device for minimally invasive cardiac surgery according to the present invention;

[0033] Figure 5 for Figure 4 A magnified schematic diagram of the structure at point C;

[0034] Figure 6 for Figure 5 A magnified schematic diagram of the structure at point D;

[0035] Figure 7 This is a schematic diagram of the rotating rod in a vascular suture device for minimally invasive cardiac surgery according to the present invention;

[0036] Figure 8 This is a schematic diagram of the lateral distribution of sutures in a vascular suture device for minimally invasive cardiac surgery according to the present invention;

[0037] Figure 9 This is a schematic diagram of the inner distribution of sutures in a vascular suture device for minimally invasive cardiac surgery according to the present invention.

[0038] in:

[0039] 100. Catheter;

[0040] 200. First casing;

[0041] 300. Second sleeve; 310. Limiting post;

[0042] 400. Suture needle; 410. Circular groove;

[0043] 500. Sutures;

[0044] 600, Drive assembly; 610, Gear; 620, Rotating rod; 621, Limiting stop; 630, Connecting end; 640, First elastic element; 650, First rotating ring; 660, First fixed ring; 670, Second elastic element; 680, Rack;

[0045] 700, Third casing;

[0046] 800. Pressure block; 810. Locking groove; 820. Guide arc;

[0047] 900. Blood vessels. Detailed Implementation

[0048] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0049] The component designations used in this document, such as "first" and "second," are merely for distinguishing the described objects and do not have any sequential or technical meaning. The terms "connection" and "linkage" used in this invention, unless otherwise specified, include both direct and indirect connections (linkages). It should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are used only for the convenience of describing the invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the invention.

[0050] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0051] like Figures 1 to 9As shown, a vascular suture device for minimally invasive cardiac surgery includes a catheter 100, a first cannula 200, a second cannula 300, suture needles 400, sutures 500, a drive assembly 600, a third cannula 700, and a suture clamping block 800. The first cannula 200 is fixedly sleeved on the outside of the catheter 100, and the second cannula 300 is slidably sleeved on the outside of the first cannula 200. Multiple suture needles 400 are circumferentially spaced at equal intervals on the lower outer peripheral wall of the second cannula 300. The sutures 500 pass sequentially through each suture needle. The needle has a 400mm eye. Both ends of the suture 500 enter the second sleeve 300 from the bottom and exit from the top. The two exiting ends of the suture 500 are connected to the upper outer peripheral wall of the second sleeve 300. The suture needle 500 has a first state and a second state. In the first state, the needle tips of multiple suture needles 500 are downward and circumferentially converged near the peripheral wall of the second sleeve 300. In the second state, the multiple suture needles 500 are circumferentially dispersed near the peripheral wall of the third sleeve 700. The needle tip of the suture needle 500 points upward and extends outward from inside the blood vessel 900. The drive assembly 600 is located at the lower part of the second sleeve 300. The drive assembly 600 is used to drive the suture needle 400 to switch between a first state and a second state. The third sleeve 700 is fitted over the outside of the second sleeve 300 (specifically, the third sleeve 700 can only move relative to the second sleeve 300 along its axis; this is achieved by ensuring that both the inner circumferential surface of the third sleeve 700 and the outer circumferential surface of the second sleeve 300 have a large coefficient of friction, thus ensuring that the third sleeve 700...). When moving relative to the second cannula 300, it needs to overcome greater frictional resistance. This allows the relative positions of the second cannula 300 and the third cannula 700 to remain unchanged after the doctor pushes the third cannula 700 to slide a certain distance relative to the axis of the second cannula 300 and stops. There are multiple suture blocks 800, which are circumferentially and equally spaced on the outer peripheral wall of the third cannula 700. The suture blocks 800 are located above the suture needle 400 and are used to hold the needle tip of the suture needle 400 that passes through the blood vessel 900.

[0052] During the surgery, the surgeon uses a scalpel to make the necessary incision at the lesion site, locates the blood vessel to be operated on, and then inserts a catheter 100, a first cannula 200, a second cannula 300, suture needles 400, and a drive assembly 600 into the blood vessel 900. As the catheter 100 is inserted into the blood vessel 900, the drive assembly 600 drives multiple suture needles 400 to converge circumferentially towards the peripheral wall of the second cannula 300 (at this point, the drive assembly 600 is in its initial state), thereby minimizing the amount of tissue left in the blood vessel 900. After the catheter 100, first cannula 200, second cannula 300, suture needle 400, and drive assembly 600 are inserted into the blood vessel 900, the doctor fixes the second cannula 300 in place using a fixation bracket, ensuring that the relative position between the second cannula 300 and the blood vessel 900 remains unchanged. After the surgery on the blood vessel 900 is completed, the wound left on the blood vessel 900 is sutured. At this point, the doctor first moves the third cannula 700, which in turn moves the suture block 800 downwards along the axis of the third cannula 700. Next, the drive assembly 600 drives multiple suture needles 400 to circumferentially disperse near the peripheral wall of the third sleeve 700. Since the third sleeve 700 is fitted outside the second sleeve 300, its outer diameter is larger than that of the second sleeve 300. Therefore, the multiple suture needles 400 are circumferentially and evenly spaced around the wound on the blood vessel 900. Then, the drive assembly 600 causes the multiple suture needles 400 to simultaneously exit from inside the blood vessel 900 outwards. At this time, the multiple suture needles 400 simultaneously drive the suture 50. The suture needles 400 emerge from the blood vessel 900. After multiple suture needles 400 emerge from the blood vessel 900, the needle tips of the suture needles 400 are engaged in the corresponding pressure block 800. Next, the doctor resets the drive assembly 600. At this time, because the suture needles 400 are engaged in the corresponding pressure block 800, the suture needles 400 gradually separate from the drive assembly 600. Next, the doctor uses hemostatic forceps to pull the sutures 500 out of the needle holes of each suture needle 400. At this time, the arrangement of the sutures 500 around the wound of the blood vessel 900 is as follows. Figure 8 and Figure 9As shown, at this point, the suture 500 emerging from the same needle hole is approximately looped. Next, the doctor adjusts the position of the first cannula 200 using a fixation bracket, causing the first cannula 200, catheter 100, second cannula 300, and drive assembly 600 to exit from the wound of the blood vessel 900. Then, hemostatic forceps are used to pull the emerging suture 500 upwards, gradually closing and reducing the size of the wound on the blood vessel 900. After the wound on the blood vessel 900 is completely closed, the doctor ties the emerging suture 500 into a knot. Next, scissors are used to cut off the excess suture 500. Finally, the suture 500 inserted into the first cannula 200 is also tied into a knot, and the excess portion of the knot is also cut off with scissors. The knot is then tied together with other knots, at which point the wound on vessel 900 is sutured. It is understood that when suturing around the wound on vessel 900, multiple suture needles 400 are first evenly spaced circumferentially outside the wound and then pass out from inside vessel 900. This ensures that the needle feet of the suture 500 are evenly distributed around the wound on vessel 900. During the suturing process, the second cannula 300 does not rotate relative to the wound on vessel 900, thus preventing the vessel wall from being easily twisted circumferentially. Therefore, the suture site on vessel 900 will not form an irregular inner vessel wall due to mutual compression of the vessel walls, thereby reducing the risk of postoperative thrombosis and minimizing postoperative safety hazards.

[0053] In this embodiment, as Figure 5 As shown, the drive assembly 600 includes a gear 610, a rotating rod 620, a connecting end 630, and a first elastic element 640. The gear 610 is rotatably disposed at the lower part of the second sleeve 300. One end of the rotating rod 620 is fixedly connected to the outer periphery of the gear 610. The connecting end 630 is rotatably connected to the end of the rotating rod 620 away from the gear 610. The first elastic element 640 is disposed inside the connecting end 630. The suture needle 400 is elastically engaged in the connecting end 630 through the first elastic element 640. When the elastic deformation of the first elastic element 640 is greater than a preset value, the suture needle 400 disengages from the connecting end 630.

[0054] In the initial state, the axis of the rotating rod 620 is parallel to the axis of the second sleeve 300. At this time, under the action of gravity, the connecting end 630 drives the suture needle 400 to hang down synchronously through the first elastic element 640 until the axis of the suture needle 400 is parallel to the axis of the second sleeve 300. Therefore, at this time, multiple suture needles 400 are gathered circumferentially to a position close to the circumferential wall of the second sleeve 300.

[0055] When suturing the blood vessel 900, the gear 610 rotates. The rotation of the gear 610 drives the rotating rod 620, the connecting end 630, and the suture needle 400 to swing upwards synchronously, so that the suture needle 400 gradually approaches the outer area of ​​the wound of the blood vessel 900. At the same time, the doctor tightens both ends of the suture 500. At this time, the tightened suture 500 pulls the suture needle 400 and the corresponding connecting end 630 to rotate upwards around its rotation connection point, so that the needle tip of the suture needle 400 faces upwards and approaches the outer area of ​​the wound of the blood vessel 900. As the gear 610 continues to rotate, the needle tip of the suture needle 400 gradually passes through the outer area of ​​the wound of the blood vessel 900 and gradually approaches the pressure block 800. When the gear 610 rotates to the point where the rotating rod 620 abuts against the lower part of the second sleeve 300, the gear 610 can no longer rotate. At this time, the suture needle 400 is just locked inside the pressure block 800.

[0056] It should be added that, as Figure 6 As shown, a locking groove 810 is provided at the lower part of the suture block 800. The outer dimensions of the locking groove 810 are adapted to the needle head size of the suture needle 400. Specifically, the size of the opening of the locking groove 810 is slightly larger than the needle head size of the suture needle 400, and the inner dimensions of the locking groove 810 are slightly smaller than the needle head size of the suture needle 400. This is because the needle head of the suture needle 400 gradually swings into the suture block 800 as the rotating rod 620 rotates. The slightly larger size of the opening of the locking groove 810 facilitates the smooth entry of the needle head into the locking groove 810. The slightly smaller inner dimensions of the locking groove 810 increase the positive pressure between the suture needle 400 and the suture block 800, making the suture needle 400 more securely engaged with the suture block 800 and preventing the suture needle 400 from disengaging from the suture block 800 after engagement.

[0057] It should also be noted that, such as Figure 5 and Figure 6 As shown, in order to make the needle tip of the suture needle 400 lock into the suture block 800 when the suture needle 400 swings with the connecting end 630 to the periphery of the wound, and at the same time make the volume of the suture block 800 as small as possible, specifically, one end of the suture block 800 is rotatably set on the outer peripheral wall of the third sleeve 700, and a guide arc 820 is provided on the lower part of the suture block 800 and the side near the locking groove 810.

[0058] When suturing the wound left on the blood vessel 900, the doctor drags the third sleeve 700 downwards by hand, causing the third sleeve 700 to slide the pressure block 800 downwards. After the guide arc 820 of the pressure block 800 contacts the outer wall of the blood vessel 900, the pressure block 800 is forced to swing upwards around its hinge point. At the same time, the outer wall of the blood vessel 900 is also stretched into an approximately flat plane by the pressure block 800. When the pressure block 800 swings upwards until the outer wall of the pressure block 800 abuts against the lower part of the third sleeve 700, the center line of the length direction of the pressure block 800 is perpendicular to the axis of the third sleeve 700. Under the support of the outer wall of the blood vessel 900, the position of the pressure block 800 remains unchanged. When the suture needle 400 swings upwards to the outer area of ​​the wound, the needle tip of the suture needle 400 can be correspondingly locked into the locking groove 810 of the pressure block 800.

[0059] It should also be noted that, in order to make the suture 500 pull the suture needle 400 to swing upwards until the axis of the suture needle 400 is parallel to the axis of the second sleeve 300 and then stop swinging, specifically, a limit stop 621 is provided at the end of the rotating rod 620 that is rotatably connected to the connecting end 630.

[0060] When the suture 500 is taut so that the suture needle 400 swings upward until its axis is parallel to the axis of the second sleeve 300, the connecting end 630 abuts against the limiting wall 621. At this time, the connecting end 630 is limited by the limiting wall 621 and cannot continue to swing towards the wound side of the blood vessel 900. At this time, the suture needle 400 keeps its needle tip facing upward and its axis parallel to the axis of the second sleeve 300 so that the suture needle 400 can be smoothly locked into the locking groove 810.

[0061] When the drive assembly 600 is reset, the doctor causes the gear 610 to rotate in the opposite direction. The gear 610 drives the rotating rod 620 to rotate in the opposite direction, and the rotating rod 620 drives the connecting end 630 to rotate in the opposite direction. At this time, since the suture needle 400 is engaged in the locking groove 810, as the rotating rod 620 continues to rotate in the opposite direction, the elastic deformation of the first elastic element 640 gradually increases. When the elastic deformation of the first elastic element 640 increases beyond the preset value, the suture needle 400 disengages from the connecting end 630. At this time, the needle tip of the suture needle 400 is still located outside the blood vessel 900, while the connecting end 630 and the rotating rod 620 are reset to their initial positions.

[0062] It should be added that, as Figure 6 As shown, the first elastic element 640 is an elastic metal ring. The middle part of the elastic metal ring arches towards the position of its axis. The outer periphery of the needle tail part of the suture needle 400 is provided with an annular groove 410. The middle part of the annular groove 410 is recessed inward. The elastic metal ring cooperates with the annular groove 410.

[0063] In the initial state, the annular groove 410 at the tail of the suture needle 400 elastically engages within the first elastic element 640. At this time, due to the mutual restraint between the arched portion in the middle of the elastic metal ring and the concave portion in the middle of the annular groove 410, the suture needle 400 cannot move relative to the connecting end 630. When the tip of the suture needle 400 is engaged in the locking groove 810 of the suture block 800, as the rotating rod 620 swings downward, the arching degree of the arched portion in the middle of the elastic metal ring gradually decreases, that is, the elastic deformation of the first elastic element 640 gradually increases. When the elastic deformation of the first elastic element 640 itself is greater than the preset value, the first elastic element 640 can no longer elastically engage the suture needle 400. At this time, as the rotating rod 620 continues to swing downward, the suture needle 400 and the connecting end 630 are disengaged from the elastic engagement, thereby allowing the suture needle 400 to continue to be engaged with the suture block 800, while the drive assembly 600 resets and moves to the initial position.

[0064] In this embodiment, as Figure 2 and Figure 5 As shown, the drive assembly 600 also includes a first rotating ring 650, a first fixed ring 660, a second elastic element 670, and racks 680. Multiple racks 680 are circumferentially spaced at equal intervals on the lower outer periphery of the first sleeve 200. Each rack 680 corresponds to and meshes with a multiple gear 610. The first rotating ring 650 is coaxially threaded to the upper part of the first sleeve 200. The first fixed ring 660 is coaxially disposed outside the second sleeve 300. 60 is located below the first rotating ring 650. The second elastic element 670 is sleeved on the outside of the second sleeve 300, and the lower end of the second elastic element 670 is set on the first fixed ring 660. The upper end of the second elastic element 670 elastically abuts against the first rotating ring 650. A limiting groove is formed on the inner peripheral wall of the second sleeve 300. The limiting groove extends along the axial direction of the second sleeve 300. A limiting protrusion is correspondingly provided on the outer peripheral wall of the first sleeve 200. The limiting protrusion is slidably connected in the limiting groove.

[0065] It should also be noted that a limiting post 310 is provided outside the first fixing ring 660, and the two ends of the suture 500 that pass through the second sleeve 300 are tied and hung outside the limiting post 310.

[0066] When it is necessary to rotate gear 610, the doctor rotates the first rotating ring 650. Through the threaded engagement and the interaction between the limiting protrusion and the limiting groove, the first rotating ring 650 causes the first sleeve 200 to move downwards. The first sleeve 200 drives multiple racks 680 to move downwards simultaneously. At this time, the meshing transmission between the racks 680 and gear 610 causes the rotating rod 620 to swing upwards. When the rotating rod 620 swings upwards until it abuts against the lower part of the second sleeve 300, the rotating rod 620 can no longer swing upwards, and gear 610 can no longer rotate, thus preventing the first sleeve 200 from moving upwards. If the doctor then continues to rotate the first rotating ring 650, the first rotating ring 650... The second elastic element 670 is gradually stretched as it moves upward along the axis of the first sleeve 200. The suture 500 is gradually tensioned by the first rotating ring 650. During the tensioning process, the suture 500 pulls the suture needle 400, causing the connecting end 630 to swing upward around its hinge point with the rotating rod 620, thereby allowing the suture needle 400 to pass through the inside of the blood vessel 900. When the connecting end 630 abuts against the limiting wall 621, the suture 500 is fully tensioned. At this time, under the blocking effect of the suture 500, the first rotating ring 650 can no longer rotate. At this time, the suture needle 400 just passes through the inside of the blood vessel 900 and the needle tip of the suture needle 400 is locked in the locking groove 810.

[0067] 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.

[0068] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the invention. 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 modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the appended claims.

Claims

1. A vascular suture device for minimally invasive cardiac surgery, characterized in that, include: catheter; The first sleeve is fixedly fitted onto the outside of the conduit; The second sleeve is slidably fitted onto the outside of the first sleeve; Suture needles, there are multiple suture needles, and the multiple suture needles are circumferentially spaced at equal intervals on the lower outer peripheral wall of the second sleeve; The suture thread passes through each suture needle in sequence. Both ends of the suture thread enter the second sleeve from the bottom and exit from the top of the second sleeve. The two ends of the suture thread are connected to the upper outer peripheral wall of the second sleeve. The suture needle has a first state and a second state. In the first state, the needle tips of multiple suture needles are facing downwards and are circumferentially gathered to the periphery of the second cannula. In the second state, the multiple suture needles are circumferentially dispersed to the periphery of the third cannula, and the needle tips of the suture needles are facing upwards and pass out from inside the blood vessel. A drive component is used to drive the suture needle to switch between a first state and a second state. The third sleeve is slidably sleeved outside the second sleeve; The suture blocks, multiple of which are circumferentially and equally spaced on the outer wall of the third sleeve, are positioned above the suture needle. The suture blocks are used to secure the needle tip of the suture needle as it exits the blood vessel. The drive assembly includes a gear, a rotating rod, a connecting end, and a first elastic element. The gear is rotatably positioned at the lower part of the second sleeve. One end of the rotating rod is fixedly connected to the outer circumference of the gear. The connecting end is rotatably connected to the end of the rotating rod furthest from the gear. The first elastic element is located inside the connecting end. The suture needle is elastically secured within the connecting end by the first elastic element. When the elastic deformation of the first elastic element exceeds a preset value, the suture needle disengages from the connecting end.

2. The vascular suture device for minimally invasive cardiac surgery according to claim 1, characterized in that, A limit stop is provided at the end of the rotating rod that is rotatably connected to the connecting end.

3. The vascular suture device for minimally invasive cardiac surgery according to claim 1, characterized in that, The first elastic element is an elastic metal ring, and the middle part of the elastic metal ring arches towards the position of its axis. The suture needle has an annular groove on its outer periphery at the tail portion, with the center of the annular groove recessed inward. The elastic metal ring fits into the annular groove.

4. A vascular suture device for minimally invasive cardiac surgery according to claim 1, 2, or 3, characterized in that, The drive assembly further includes a first rotating ring, a first fixed ring, a second elastic element, and racks. There are multiple racks, which are circumferentially spaced at equal intervals on the lower outer periphery of the first sleeve. The multiple racks correspond one-to-one with multiple gears and mesh with each other. The first rotating ring is coaxially threaded to the upper part of the first sleeve. The first fixed ring is coaxially disposed outside the second sleeve and is located below the first rotating ring. The second elastic element is sleeved outside the second sleeve, with its lower end disposed on the first fixed ring and its upper end elastically abutting against the first rotating ring.

5. A vascular suture device for minimally invasive cardiac surgery according to claim 4, characterized in that, A limiting post is provided on the outside of the first fixing ring, and the two ends of the suture thread that pass through the second sleeve are tied together and hung on the outside of the limiting post.

6. A vascular suture device for minimally invasive cardiac surgery according to claim 1, characterized in that, A limiting groove is formed on the inner peripheral wall of the second sleeve, and the limiting groove extends along the axial direction of the second sleeve. A limiting protrusion is correspondingly provided on the outer peripheral wall of the first sleeve, and the limiting protrusion is slidably connected in the limiting groove.

7. A vascular suture device for minimally invasive cardiac surgery according to claim 1, characterized in that, The lower part of the pressure block is provided with a locking groove, the outer dimensions of which are adapted to the size of the suture needle tip.

8. A vascular suture device for minimally invasive cardiac surgery according to claim 7, characterized in that, One end of the pressure block is rotatably mounted on the outer peripheral wall of the third sleeve, and a guide arc is provided on the lower part of the pressure block and the side near the locking groove.

9. A vascular suture device for minimally invasive cardiac surgery according to claim 1, characterized in that, The upper end of the catheter extends out from the first sleeve.

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