Ring shrinker

Abstract

The application belongs to the technical field of medical devices, and more particularly relates to a ring shrink device. The ring shrink device comprises an anchoring part and an unlocking part. The anchoring part has an anchoring position which is expanded to be anchored in a blood vessel and a recovery position which can be recovered into a delivery catheter. The unlocking part is connected with the anchoring part and can drive the anchoring part to switch from the anchoring position to the recovery position. When the anchoring part needs to be recovered and repositioned, the unlocking part is pulled outwards to make the anchoring part switch from the anchoring position to the recovery position. At this time, the size of the anchoring part is close to the inner diameter of the delivery catheter, which greatly reduces the recovery resistance of the anchoring part to the recovery position in the delivery catheter, so that the anchoring part can be recovered into the delivery catheter very smoothly. The unlocking part in the application not only improves the recovery success rate of the anchoring part, but also reduces the operation cost and shortens the operation time.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of medical devices, and more particularly relates to a ring shrinkage device. BACKGROUND

[0002] The mitral valve is a part of the heart, located between the left atrium and the left ventricle. Blood is pumped from the left atrium into the left ventricle, and when the left ventricle contracts to pump blood into the body, the mitral valve closes to prevent blood from being pumped back into the left atrium. In some patients, due to genetic deformities, diseases or injuries, etc., the mitral valve cannot close normally, commonly known as regurgitation, that is, blood is pumped into the atrium every time the myocardium contracts. Regurgitation reduces circulation efficiency and must be corrected.

[0003] Nowadays, minimally invasive interventional surgery is a better choice for most heart valve diseases, and the main interventional treatment methods include artificial chordae tendineae implantation, mitral annuloplasty and mitral valve edge-to-edge repair, etc. Among them, annuloplasty has two types of direct annuloplasty and indirect annuloplasty. Indirect annuloplasty mainly uses the blood vessel tissue around the mitral annulus to contract the mitral annulus to make the mitral leaflets close tightly. The coronary sinus-cardiac vein is mainly a blood vessel around the mitral annulus, which also makes it the best implantation object for indirect annuloplasty.

[0004] REFERENCE Figures 1 to 5 The device has two anchors, which are a distal anchor 10 and a proximal anchor 20. The distal anchor 10 and the proximal anchor 20 are connected together through a connecting rod 30. The distal anchor 10 includes a distal anchor body 11 and a distal sleeve 13, the distal anchor body 11 is wound on the connecting rod 30 to form a distal limiting ring 12, and the connecting rod 30 is formed with a distal limiting portion 31 on the side away from the distal sleeve 13 of the distal limiting ring 12; the proximal anchor 20 includes a proximal anchor body 21 and a proximal sleeve 23, the proximal anchor body 21 is wound on the connecting rod 30 to form a proximal limiting ring 22, and the connecting rod 30 is formed with a proximal limiting portion 32 on the side away from the proximal sleeve 23 of the proximal limiting ring 22.

[0005] The device is implanted in the coronary sinus-cardiac great vein blood vessel 1 through the neck vein into the body through the delivery catheter 40, and after the distal anchor body 11 is released from the delivery catheter 40, the delivery catheter 40 is used to push the distal limiting ring 12 into the distal limiting part 31 and the distal sleeve 13, the distal anchor body 11 expands the coronary sinus-cardiac great vein blood vessel 1, and is anchored in the coronary sinus-cardiac great vein blood vessel 1; then the delivery catheter 40 is withdrawn from the blood vessel to the outside, so as to drive the distal anchor 10 to move to the outside of the blood vessel, so that the mitral annulus 2 muscle tissue is tightened, and then the diameter of the mitral annulus 2 is indirectly reduced, at this time the delivery catheter 40 is withdrawn to release the proximal anchor body 21, and after the proximal anchor 20 is released, the proximal limiting ring 22 is pushed into the proximal sleeve 23 and the proximal limiting part 32 through the push rod 50, the proximal anchor body 21 expands to support the coronary sinus-cardiac great vein blood vessel 1, and is anchored in the coronary sinus-cardiac great vein blood vessel 1, and after the device is released, the diameter of the mitral annulus 2 is reduced, so that the mitral valve leaflet is tightly closed, and the mitral regurgitation is improved.

[0006] However, the distal anchor 10 and the proximal anchor 20 in the existing device can only be forcibly recovered through the delivery catheter 40 in the locked state, and the distal anchor 10 and the proximal anchor 20 in the locked state belong to a stable state. In order to put the expanded distal anchor 10 and the proximal anchor 20 into the delivery catheter 40 with a smaller diameter, the recovery resistance is large, and the delivery catheter 40 needs strong rigid support. If the rigidity of the delivery catheter 40 is not enough, the delivery catheter 40 is easy to bend, which easily leads to the failure of the device recovery. SUMMARY

[0007] The purpose of the embodiment of the present application is to provide a ring shrinking device, which aims to solve the technical problem that the existing mitral valve device is not easy to recover after being released.

[0008] In order to achieve the above-mentioned purpose, according to one aspect of the present application, a ring shrinking device is provided, which comprises an anchoring part and an unlocking part. The anchoring part has an anchoring position which is expanded to be anchored in a blood vessel, and a recovery position which can be recovered into a delivery catheter. The unlocking part is connected with the anchoring part, and can drive the anchoring part to switch from the anchoring position to the recovery position.

[0009] Optionally, the anchoring part comprises a distal anchor and a proximal anchor, the proximal anchor is located on a first side of the distal anchor; the distal anchor comprises a distal anchor body, the distal anchor body has a first expanded position capable of expanding to anchor in the blood vessel and a first contracted position capable of deforming and contracting; the unlocking part can drive the distal anchor body to switch from the first expanded position to the first contracted position; the proximal anchor comprises a proximal anchor body, the proximal anchor body has a second expanded position capable of expanding to anchor in the blood vessel and a second contracted position capable of deforming and contracting; the unlocking part can drive the proximal anchor body to switch from the second expanded position to the second contracted position; when the distal anchor body is in the first expanded position and the proximal anchor body is in the second expanded position, the anchoring part is in the anchoring position; when the distal anchor body is in the first contracted position and the proximal anchor body is in the second contracted position, the anchoring part is in the recovery position.

[0010] Optionally, the anchoring part further comprises a connecting piece, the connecting piece is arranged between the distal anchor and the proximal anchor and connected with the distal anchor and the proximal anchor respectively; the distal anchor body is wound on the connecting piece to form a distal limiting ring, the connecting piece is formed with a distal limiting part on a side of the distal limiting ring close to the proximal anchor, and the distal limiting ring is limited on a side of the distal limiting part away from the proximal anchor, at this time the distal anchor body is in the first expanded position; the distal limiting ring is slidably installed on the connecting piece, and the unlocking part can drive the distal limiting ring to pass through the distal limiting part along the length direction of the connecting piece, so as to switch the distal anchor body from the first expanded position to the first contracted position; the proximal anchor body is wound on the connecting piece to form a proximal limiting ring, the connecting piece is formed with a proximal limiting part on a side of the proximal limiting ring away from the distal anchor, and the proximal limiting ring is limited on a side of the proximal limiting part close to the distal anchor, at this time the proximal anchor body is in the second expanded position; the proximal limiting ring is slidably installed on the connecting piece, and the unlocking part can drive the proximal limiting ring to pass through the proximal limiting part along the length direction of the connecting piece, so as to switch the proximal anchor body from the second expanded position to the second contracted position.

[0011] Optionally, the unlocking part comprises a distal traction part, a proximal traction part and a guide piece; the distal traction part is located on a side of the distal limiting ring away from the distal limiting part, the guide piece is arranged through the distal limiting ring and the distal traction part, the distal traction part can move along the extension direction of the guide piece, and the distal traction part can pull the distal limiting ring to pass through the distal limiting part along the length direction of the connecting piece; the proximal traction part is located on a side of the proximal limiting ring away from the proximal limiting part, the guide piece is arranged through the proximal limiting ring and the proximal traction part, the proximal traction part can move along the extension direction of the guide piece, and the proximal traction part can pull the proximal limiting ring to pass through the proximal limiting part along the length direction of the connecting piece.

[0012] Optionally, the distal traction part is a distal traction member, a distal traction ring is formed on the distal traction member, the distal traction ring is located on a side of the distal limiting ring away from the distal limiting part, and the guide member passes through the distal traction ring; or, the distal traction part is a single rope, the single rope is folded to form two distal traction ropes, the intersection of the two distal traction ropes is located on a side of the distal limiting ring away from the distal limiting part, and the two distal traction ropes are arranged on the guide member to pull the distal limiting ring to pass through the distal limiting part along the length direction of the connecting member.

[0013] Optionally, the proximal traction part is a proximal traction member, a proximal traction ring is formed on the proximal traction member, the proximal traction ring is located on a side of the proximal limiting ring away from the proximal limiting part, and the guide member passes through the proximal traction ring; or, the proximal traction part is a single rope, the single rope is folded to form two proximal traction ropes, the intersection of the two proximal traction ropes is located on a side of the proximal limiting ring away from the proximal limiting part, and the two proximal traction ropes are arranged on the guide member to pull the proximal limiting ring to pass through the proximal limiting part along the length direction of the connecting member.

[0014] Optionally, the unlocking part includes a distal traction rope and a proximal traction rope, a first end of the distal traction rope passes through the distal limiting ring from a side of the distal limiting ring away from the distal limiting part and extends away from the distal limiting ring to the distal limiting part, a second end of the distal traction rope extends away from the distal limiting ring to the distal limiting part; a first end of the proximal traction rope passes through the proximal limiting ring from a side of the proximal limiting ring away from the proximal limiting part and extends away from the proximal limiting ring to the proximal limiting part; and a second end of the proximal traction rope extends away from the proximal limiting ring to the proximal limiting part.

[0015] Optionally, the distal anchor further includes a distal sleeve, a first end of the distal sleeve is away from the proximal anchor, the two ends of the distal anchor body can pass into the distal sleeve from the first end of the distal sleeve and are connected with the distal sleeve; and the proximal anchor further includes a proximal sleeve, a first end of the proximal sleeve is close to the distal anchor, the two ends of the proximal anchor body can pass into the proximal sleeve and are connected with the proximal sleeve.

[0016] Optionally, a distal opening is formed on the outer circumferential surface of the second end of the distal sleeve, and the first end of the guide member passes into the distal sleeve through the distal opening.

[0017] Optionally, the outer circumferential surface of the distal sleeve is provided with a giving part, a first end of the giving part is in communication with the distal opening, and a second end of the giving part extends to the end surface of the second end of the distal sleeve; the guide member is placed in the giving part and passes into the distal sleeve through the distal opening.

[0018] Optionally, a fixing member is arranged on the distal sleeve, and the guide member is threadedly connected with the fixing member.

[0019] Optionally, the distal limiting ring comprises a distal limiting ring body and a distal auxiliary ring, the distal auxiliary ring is arranged on one side of the distal limiting ring body and connected with the distal limiting ring body, and the guide member passes through the distal auxiliary ring.

[0020] Optionally, the proximal limiting ring is formed with a first through hole and a second through hole, the connecting member passes through the first through hole and the second through hole and penetrates into the proximal sleeve, and the guide member passes through the second through hole and is located outside the proximal sleeve.

[0021] Optionally, the connecting member is two connecting rods, one of the two connecting rods is formed with a winding limiting portion, and the guide member passes through the winding limiting portion.

[0022] Optionally, the proximal sleeve is formed with a proximal notch on the outer periphery of the first end, the guide member penetrates into the proximal sleeve from the proximal notch and penetrates out of the proximal sleeve from the first end of the proximal sleeve to the direction of the distal end of the proximal sleeve, the two ends of the proximal anchor body penetrate into the proximal sleeve from the proximal notch and are connected with the proximal sleeve, and / or the proximal anchor further comprises a limiting tube arranged on the outer periphery of the proximal sleeve, and the guide member passes through the limiting tube.

[0023] Optionally, the connecting member is two connecting rods, one of the two connecting rods is formed with a winding limiting portion, and the guide member passes through the winding limiting portion.

[0024] Optionally, the proximal limiting ring comprises a proximal limiting ring body and a proximal auxiliary ring, the proximal auxiliary ring is arranged on one side of the proximal limiting ring body and connected with the proximal limiting ring body, the proximal auxiliary ring is formed with a second through hole, and the guide member passes through the proximal auxiliary ring.

[0025] The ring shrinking device provided by the present application has the beneficial effect that, compared with the prior art, when the anchoring part needs to be recovered and repositioned, the unlocking part is pulled outwards to make the anchoring part switch from the anchoring position to the recovery position, at this time, the size of the anchoring part is close to the inner diameter of the delivery catheter, which greatly reduces the recovery resistance of the anchoring part recovered into the delivery catheter. The unlocking part in the present application not only improves the recovery success rate of the anchoring part, but also shortens the operation cost and the operation time. BRIEF DESCRIPTION OF DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0027] Figure 1 The structure schematic diagram of the ring shrinking device provided for the background art in the blood vessel is shown in the figure;

[0028] Figure 2 Structure diagram of the distal anchor of the ring shrink device provided as the background technology;

[0029] Figure 3 Structure diagram of the proximal anchor of the ring shrink device provided as the background technology;

[0030] Figure 4 Schematic diagram of the ring shrink device provided as the background technology in the blood vessel;

[0031] Figure 5 Schematic diagram of the ring shrink device provided as the background technology in the blood vessel;

[0032] Figure 6 Structure diagram of the ring shrink device provided as the embodiment of the present application;

[0033] Figure 7 Structure diagram of the distal anchor of the ring shrink device provided as the embodiment of the present application;

[0034] Figure 8 Structure diagram of the proximal anchor of the ring shrink device provided as the embodiment of the present application; Figure 7 Enlarged diagram of A in the middle;

[0035] Figure 9 Structure diagram of the proximal anchor and the push rod of the ring shrink device provided as the embodiment of the present application;

[0036] Figure 10 Structure diagram of the proximal anchor of the ring shrink device provided as the embodiment of the present application;

[0037] Figure 11 Structure diagram of the proximal pull rope of the ring shrink device provided as the embodiment of the present application;

[0038] Figure 12 Structure diagram of the distal traction rope of the ring shrink device provided as the embodiment of the present application;

[0039] Figure 13 Structure diagram of the distal sleeve of the ring shrink device provided as the embodiment of the present application;

[0040] Figure 14 Structure diagram of the distal sleeve of the ring shrink device provided as the embodiment of the present application;

[0041] Figure 15 Structure diagram of the proximal anchor of the ring shrink device provided as the embodiment of the present application;

[0042] Figure 16 Structure diagram of the proximal sleeve of the ring shrink device provided as the embodiment of the present application;

[0043] Figure 17Structure diagram of a limiting tube provided on a proximal sleeve of a ring shrinkage device according to an embodiment of the present application;

[0044] Figure 18 Structure diagram of a proximal limiting ring body connected with a proximal auxiliary ring of a ring shrinkage device according to an embodiment of the present application.

[0045] The reference numerals involved in the above drawings are as follows:

[0046] 10, distal anchor; 11, distal anchor body; 12, distal limiting ring; 13, distal sleeve; 20, proximal anchor; 21, proximal anchor body; 22, proximal limiting ring; 23, proximal sleeve; 30, connecting rod; 31, distal limiting part; 32, proximal limiting part; 40, delivery catheter; 50, push rod; 1, coronary sinus-cardinal vein vessel; 2, mitral annulus.

[0047] 100, distal anchor; 110, distal anchor body; 120, distal limiting ring; 130, distal sleeve; 131, distal notch; 140, fixing member; 200, proximal anchor; 210, proximal anchor body; 220, proximal limiting ring; 221, first through hole; 222, second through hole; 223, proximal limiting ring body; 224, proximal auxiliary ring; 230, proximal sleeve; 231, proximal notch; 240, limiting tube; 300, connecting member; 310, distal limiting part; 320, proximal limiting part; 330, winding limiting part; 400, unlocking part; 410, distal traction part; 411, distal traction member; 412, distal traction ring; 414, distal traction rope; 420, proximal traction part; 421, proximal traction member; 422, proximal traction ring; 423, proximal traction rope; 430, guide member; 500, locking wire; 600, push rod; 700, delivery catheter. DETAILED DESCRIPTION

[0048] In order to make the technical problems, technical solutions and beneficial effects of the present application clearer, the present application will be further described in detail below in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and not used to limit the present application.

[0049] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element. The embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the drawings and in combination with the embodiments.

[0050] It should be understood that the terms "length", "width", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like, indicate directions or positions based on the directions or positions shown in the drawings, and are used for convenience of description and simplification of description only, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the application.

[0051] In addition, the terms "distal" and "proximal" are used only for description purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined as "distal" and "proximal" can explicitly or implicitly include one or more of the features. In the description of the application, the meaning of "a plurality of" is two or more, unless otherwise specifically limited.

[0052] With reference to Figure 6 The embodiments of the present application provide a ring shrink device, which comprises an anchoring part and an unlocking part 400. The anchoring part has an anchoring position expanded to be anchored in a blood vessel and a recovery position capable of being recovered into a delivery catheter 700. The unlocking part 400 is connected with the anchoring part, and the unlocking part 400 can drive the anchoring part to switch from the anchoring position to the recovery position.

[0053] In the embodiments of the present application, the ring shrink device further comprises a delivery catheter 700, and the anchoring part is always located in the delivery catheter 700 before being expanded to be anchored in the blood vessel.

[0054] In specific applications, when the anchoring part needs to be recovered and repositioned, the unlocking part 400 is pulled outwards to make the anchoring part switch from the anchoring position to the recovery position. At this time, the size of the anchoring part is close to the inner diameter of the delivery catheter 700, which greatly reduces the recovery resistance of the anchoring part recovered into the delivery catheter 700, so that the anchoring part can be recovered into the delivery catheter 700 very smoothly. The unlocking part 400 in the present application not only improves the recovery success rate of the anchoring part, but also reduces the operation cost and shortens the operation time.

[0055] With reference to Figures 6 to 9, the anchoring part comprises a distal anchor 100 and a proximal anchor 200, the proximal anchor 200 is located on a first side of the distal anchor 100. The distal anchor 100 comprises a distal anchor body 110, the distal anchor body 110 has a first expanded position capable of expanding to anchor in a blood vessel, and a first contracted position capable of being deformed and contracted; the unlocking part 400 can drive the distal anchor body 110 to switch from the first expanded position to the first contracted position. The proximal anchor 200 comprises a proximal anchor body 210, the proximal anchor body 210 has a second expanded position capable of expanding to anchor in a blood vessel, and a second contracted position capable of being deformed and contracted; the unlocking part 400 can drive the proximal anchor body 210 to switch from the second expanded position to the second contracted position.

[0056] When the distal anchor body 110 is in the first expanded position, and the proximal anchor body 210 is in the second expanded position, the anchoring part is in the anchoring position; when the distal anchor body 110 is in the first contracted position, and the proximal anchor body 210 is in the second contracted position, the anchoring part is in the recovery position.

[0057] Referring to Figures 6 to 9 In the embodiment of the present application, the ring shrinking device further comprises a locking wire 500, a push rod 600 and a delivery handle, wherein the push rod 600 is located on a side of the proximal anchor body 210 away from the distal anchor body 110, both ends of the push rod 600 are open and hollow inside, the delivery handle is arranged at an end of the push rod 600 away from the anchoring part and is connected with the push rod 600; the locking wire 500 is arranged between the anchoring part and the push rod 600, a first end of the locking wire 500 is connected with the anchoring part, a second end of the locking wire 500 penetrates into the push rod 600 and is fixedly connected with the delivery handle. The distal anchor body 110 and the proximal anchor body 210 are both made of nickel-titanium alloy, of course, in other examples, the distal anchor body 110 and the proximal anchor body 210 can also be made of other materials capable of being deformed. The first side of the distal anchor 100 refers to the position of one side of the distal anchor 100.

[0058] In a specific application, the anchoring part is introduced into the body through the delivery catheter 700 from the jugular vein, implanted in the coronary sinus - great cardiac vein, and after the distal anchor body 110 is released from the delivery catheter 700, the distal anchor body 110 is switched from the first contracted position to the first expanded position by the delivery catheter 700, the distal anchor body 110 is expanded to support the blood vessel, and is anchored in the great cardiac vein. Then the delivery catheter 700 is withdrawn from the blood vessel to the outside to drive the distal anchor body 110 to move outwardly of the blood vessel, thereby tightening the muscle tissue of the mitral annulus, and indirectly reducing the diameter of the annulus. At this time, the delivery catheter 700 is withdrawn to release the proximal anchor body 210, and after the proximal anchor body 210 is released, the proximal anchor body 210 is switched from the second contracted position to the second expanded position by the push rod 600 driven by the delivery handle, the proximal anchor body 210 is expanded to support the blood vessel, and is anchored in the coronary sinus. After the annulus shrinking device is released, the diameter of the annulus is reduced, thereby making the mitral valve leaflets close tightly and improving the mitral regurgitation.

[0059] When the anchoring part needs to be retrieved and repositioned, the unlocking part 400 drives the distal anchor body 110 to switch from the first expanded position to the first contracted position, and at the same time, the unlocking part 400 drives the proximal anchor body 210 to switch from the second expanded position to the second contracted position. At this time, the size of the distal anchor body 110 and the size of the proximal anchor body 210 are similar to the inner diameter of the delivery catheter 700, greatly reducing the resistance to recovery, so that the distal anchor body 110 and the proximal anchor body 210 can be smoothly retrieved into the delivery catheter 700.

[0060] Referring to Figure 6 , the anchoring part further comprises a connecting piece 300, which is arranged between the distal anchor 100 and the proximal anchor 200 and connected with the distal anchor 100 and the proximal anchor 200 respectively.

[0061] Referring to Figure 7 and Figure 8 , the distal anchor body 110 is wound on the connecting piece 300 to form a distal limiting ring 120, the connecting piece 300 is formed with a distal limiting part 310 on the side of the distal limiting ring 120 close to the proximal anchor 200, and the distal limiting ring 120 is limited on the side of the distal limiting part 310 away from the proximal anchor 200, at this time, the distal anchor body 110 is in the first expanded position; the distal limiting ring 120 is slidably installed on the connecting piece 300, and the unlocking part 400 can drive the distal limiting ring 120 to pass through the distal limiting part 310 along the length direction of the connecting piece 300, so as to switch the distal anchor body 110 from the first expanded position to the first contracted position.

[0062] Referring to Figure 9 and Figure 10The proximal end anchor body 210 is wound on the connecting piece 300 to form a proximal end limiting ring 220, the connecting piece 300 is formed with a proximal end limiting portion 320 on the side away from the distal end anchor 100 of the proximal end limiting ring 220, the proximal end limiting ring 220 is limited on the side close to the distal end anchor 100 of the proximal end limiting portion 320, at this time, the proximal end anchor body 210 is in the second expansion position; the proximal end limiting ring 220 is slidably installed on the connecting piece 300, the unlocking portion 400 can drive the proximal end limiting ring 220 to pass through the proximal end limiting portion 320 along the length direction of the connecting piece 300, so that the proximal end anchor body 210 is switched from the second expansion position to the second contraction position.

[0063] In the embodiment of the application, the connecting piece 300 is made of nickel-titanium alloy, of course, in other examples, the connecting piece 300 can also be made of other materials capable of being deformed. Specifically, the connecting piece 300 is two connecting rods, the distal end limiting portion 310 is a protruding structure formed in the direction away from each other of the two connecting rods, similar to a vase in shape; the proximal end limiting portion 320 is also a protruding structure formed in the direction away from each other of the two connecting rods, similar to an arrow in shape, of course, in other examples, the distal end limiting portion 310 and the proximal end limiting portion 320 can also be protruding structures of other shapes. The distal end limiting portion 310 and the proximal end limiting portion 320 can be deformed, so that the distal end limiting ring 120 and the proximal end limiting ring 220 pass through the distal end limiting portion 310 and the proximal end limiting portion 320 respectively. The distal end limiting ring 120 and the proximal end limiting ring 220 are wound for two turns, of course, in other examples, the distal end limiting ring 120 and the proximal end limiting ring 220 can also be wound for one turn, three turns or other number of turns.

[0064] In a specific application, the distal anchor body 110 is released from the delivery catheter 700, at this time the distal retaining ring 120 is located on the side of the distal retaining portion 310 away from the distal anchor body 110, and the distal anchor body 110 is in the first contracted position. Then the distal retaining ring 120 is pushed into the distal retaining portion 310 by the delivery catheter 700 to the side close to the distal anchor body 110, so as to limit the distal retaining ring 120. Then the distal anchor body 110 expands to support the blood vessel and is anchored at the great cardiac vein, at this time the distal anchor body 110 is in the first expanded position. Then the delivery catheter 700 is withdrawn from the blood vessel to the outside, so as to drive the distal anchor body 110 to move to the outside of the blood vessel, so as to make the mitral annulus muscle tissue contract, and then indirectly reduce the diameter of the annulus. Finally, the delivery catheter 700 is withdrawn to release the proximal anchor body 210, at this time the proximal retaining ring 220 is located on the side of the proximal retaining portion 320 away from the proximal anchor body 210, and the proximal anchor body 210 is in the second contracted position. Then the proximal retaining ring 220 is pushed into the proximal retaining portion 320 by the push rod 600 to the side close to the proximal anchor body 210, so as to limit the proximal retaining ring 220. Then the proximal anchor body 210 expands to support the blood vessel and is anchored at the coronary sinus, at this time the proximal anchor body 210 is in the second expanded position. After the ring shrinking device is released, the diameter of the annulus is reduced, so as to make the mitral valve leaflet close tightly and improve the mitral regurgitation.

[0065] When the anchor portion needs to be retrieved and repositioned, the unlocking portion 400 drives the distal retaining ring 120 to slide along the length direction of the connecting member 300 from the side of the distal retaining portion 310 close to the distal anchor body 110 to the side of the distal retaining portion 310 away from the distal anchor body 110, so as to switch the distal anchor body 110 from the first expanded position to the first contracted position. Then the unlocking portion 400 drives the proximal retaining ring 220 to slide from the side of the proximal retaining portion 320 close to the proximal anchor body 210 to the side of the proximal retaining portion 320 away from the proximal anchor body 210, so as to switch the proximal anchor body 210 from the second expanded position to the second contracted position. At this time, the size of the distal anchor body 110 and the size of the proximal anchor body 210 are approximately similar to the inner diameter of the delivery catheter 700, so as to facilitate the smooth retrieval of the distal anchor body 110 and the proximal anchor body 210 into the delivery catheter 700.

[0066] Referring to Figure 7 and Figure 9 , the distal anchor 100 further comprises a distal sleeve 130, one end of the distal sleeve 130 away from the proximal anchor 200 is a first end, and the two ends of the distal anchor body 110 can pass into the distal sleeve 130 from the first end of the distal sleeve 130 and be connected with the distal sleeve 130. The proximal anchor 200 further comprises a proximal sleeve 230, one end of the proximal sleeve 230 close to the distal anchor 100 is a first end, and the two ends of the proximal anchor body 210 can pass into the proximal sleeve 230 and be connected with the proximal sleeve 230.

[0067] In the embodiment of the present application, the two ends of the distal anchor body 110 are fixedly connected with the inner wall of the distal sleeve 130 by welding, and the two ends of the proximal anchor body 210 are fixedly connected with the inner wall of the proximal sleeve 230 by welding. Of course, in other examples, the fixed connection can also be achieved by press riveting.

[0068] The distal limiting ring 120 and the distal limiting portion 310 are located on one side of the second end of the distal sleeve 130, and the proximal limiting ring 220 and the proximal limiting portion 320 are located on one side of the second end of the proximal sleeve 230.

[0069] The first end of the connecting piece 300 passes through the proximal sleeve 230 and penetrates into the distal sleeve 130, and is fixedly connected with the inner wall of the distal sleeve 130, and the second end of the connecting piece 300 forms the proximal limiting portion 320.

[0070] The distal anchor body 110 includes a first body segment, a second body segment and a first intermediate segment. The end of the first body segment is the end of the distal anchor body 110, the second body segment is formed with the distal limiting ring 120 on the connecting piece 300, and the first intermediate segment is located between the first body segment and the second body segment and is wound in a threaded shape. Specifically, when the distal anchor body 110 is in the first expanded position, the distance between the first body segment and the second body segment decreases, the distance between the first intermediate segment and the distal sleeve 130 increases, and at this time the distal limiting ring 120 is located between the distal sleeve 130 and the distal limiting portion 310; when the distal anchor body 110 is in the first contracted position, the distance between the first body segment and the second body segment increases, the distance between the first intermediate segment and the distal sleeve 130 decreases, and at this time the distal limiting ring 120 is located on the side of the distal limiting portion 310 away from the distal sleeve 130.

[0071] Referring to Figure 7 and Figure 9 The proximal anchor body 210 includes a third body segment, a fourth body segment and a second intermediate segment. The end of the third body segment is the end of the proximal anchor body 210, the second body segment is formed with the proximal limiting ring 220 on the connecting piece 300, and the second intermediate segment is located between the third body segment and the fourth body segment and is wound in a threaded shape. Specifically, when the proximal anchor body 210 is in the second expanded position, the distance between the third body segment and the fourth body segment decreases, the distance between the second intermediate segment and the proximal sleeve 230 increases, and at this time the proximal limiting ring 220 is located between the proximal sleeve 230 and the proximal limiting portion 320; when the proximal anchor body 210 is in the second contracted position, the distance between the third body segment and the fourth body segment increases, the distance between the second intermediate segment and the proximal sleeve 230 decreases, and at this time the proximal limiting ring 220 is located on the side of the proximal limiting portion 320 away from the proximal sleeve 230.

[0072] With reference to Figures 6 to 10 The unlocking part 400 comprises a distal traction part 410, a proximal traction part 420 and a guide 430. The distal traction part 410 is located on the side of the distal limiting ring 120 away from the distal limiting part 310. The guide 430 is arranged through the distal limiting ring 120 and the distal traction part 410. The distal traction part 410 can move along the extension direction of the guide 430. The distal traction part 410 can pull the distal limiting ring 120 to pass through the distal limiting part 310 along the length direction of the connecting part 300. The proximal traction part 420 is located on the side of the proximal limiting ring 220 away from the proximal limiting part 320. The guide 430 is arranged through the proximal limiting ring 220 and the proximal traction part 420. The proximal traction part 420 can move along the extension direction of the guide 430. The proximal traction part 420 can pull the proximal limiting ring 220 to pass through the proximal limiting part 320 along the length direction of the connecting part 300.

[0073] In the embodiment of the present application, the guide 430 is made of a deformable material.

[0074] In a specific application, when the anchoring part needs to be retrieved and repositioned, the distal traction part 410 is pulled outwards. With the movement of the distal traction part 410 along the length direction of the guide 430, the distal traction part 410 will come into contact with the distal limiting ring 120. The distal traction part 410 is continuously pulled outwards. At this time, the distal traction part 410 will pull the distal limiting ring 120 to pass through the distal limiting part 310 along the length direction of the connecting part 300, so that the distal anchor body 110 is switched from the first expanded position to the first contracted position.

[0075] At the same time, the proximal traction part 420 is pulled outwards. With the movement of the proximal traction part 420 along the extension direction of the guide 430, the proximal traction part 420 will come into contact with the proximal limiting ring 220. The proximal traction part 420 is continuously pulled outwards. At this time, the proximal traction part 420 will pull the proximal limiting ring 220 to pass through the proximal limiting part 320 along the length direction of the connecting part, so that the proximal anchor body 210 is switched from the second expanded position to the second contracted position.

[0076] When the anchoring part is switched from the anchoring position to the retrieval position, the guide 430 is first pulled outwards, then the distal traction part 410 and the proximal traction part 420 are pulled outwards, and finally the delivery handle and the push rod 600 are pulled outwards. At this time, the locking wire 500 will be pulled out of the proximal sleeve 230, so that only the anchoring part remains in the blood vessel.

[0077] The guide 430 is arranged to not only guide the distal traction part 410 and the proximal traction part 420, but also connect the distal limiting ring 120 and the distal traction part 410 and the proximal limiting ring 220 and the proximal traction part 420 together, so as to drive the distal limiting ring 120 to move by the distal traction part 410 and drive the proximal limiting ring 220 to move by the proximal traction part 420.

[0078] In one embodiment of the embodiment of the present application, referring to Figure 7 and Figure 8 , the distal traction part 410 is a distal traction member 411, and the distal traction member 411 is formed with a distal traction ring 412, the distal traction ring 412 is located on the side of the distal limiting ring 120 away from the distal limiting part 310, and the guide 430 passes through the distal traction ring 412.

[0079] In the embodiment, the distal traction member 411 can be a single traction rope or a traction rod made of nickel-titanium alloy, stainless steel, multi-strand wire or the like, and can also be a single braided rope.

[0080] In specific applications, when the anchoring part needs to be recovered and repositioned, the distal limiting ring 120 is located between the distal sleeve 130 and the distal limiting part 310, and the distal traction member 411 moves away from the distal anchor body 110, in the process of moving, the distal traction ring 412 will touch the distal limiting ring 120, and with the continuous movement of the distal traction member 411, the distal limiting ring 120 will switch from the first expanded position to the first contracted position.

[0081] In one embodiment of the embodiment of the present application, referring to Figure 9 and Figure 10 , the proximal traction part 420 is a proximal traction member 421, and the proximal traction member 421 is formed with a proximal traction ring 422, the proximal traction ring 422 is located on the side of the proximal limiting ring 220 away from the proximal limiting part 320, and the guide 430 passes through the proximal traction ring 422.

[0082] In the embodiment, the proximal traction member 421 can be a single traction rope or a traction rod made of nickel-titanium alloy, stainless steel, multi-strand wire or the like, and can also be a single braided rope.

[0083] In specific applications, when the anchoring part needs to be recovered and repositioned, the proximal limiting ring 220 is located between the proximal sleeve 230 and the proximal limiting part 320, and the proximal traction member 421 moves away from the proximal anchor body 210, in the process of moving, the proximal traction ring 422 will touch the proximal limiting ring 220, and with the continuous movement of the proximal traction member 421, the proximal limiting ring 220 will switch from the second expanded position to the second contracted position.

[0084] The single remote traction member 411 and the single proximal traction member 421 can avoid the mutual entanglement of the traction members during the delivery of the ring shrink device into the blood vessel, so as to affect the normal development of the unlocking operation.

[0085] In another embodiment of the present application, Figure 11 The proximal traction member 420 is a single rope, which is folded to form two proximal traction ropes 423. The junction of the two proximal traction ropes 423 is located on the side of the proximal limiting ring 220 away from the proximal limiting portion 320, and is arranged on the guide member 430 to pull the proximal limiting ring 220 to pass through the proximal limiting portion 320 along the length direction of the connecting member 300.

[0086] In the present embodiment, the single rope can be made of nickel-titanium alloy, stainless steel, multi-strand wire, etc. In specific applications, when the anchoring portion needs to be retrieved and repositioned, the proximal limiting ring 220 is located between the proximal sleeve 230 and the proximal limiting portion 320, and the two proximal traction ropes 423 move away from the proximal anchor body 210. During the movement, the junction of the two proximal traction ropes 423 will touch the proximal limiting ring 220, and with the continuous movement of the two proximal traction ropes 423, the proximal limiting ring 220 will switch from the second expanded position to the second contracted position.

[0087] In another embodiment of the present application, the remote traction member 410 is a single rope, which is folded to form two remote traction ropes. The junction of the two remote traction ropes is located on the side of the remote limiting ring 120 away from the remote limiting portion 310, and is arranged on the guide member 430 to pull the remote limiting ring 120 to pass through the remote limiting portion 310 along the length direction of the connecting member 300.

[0088] In the present embodiment, the single rope can be made of nickel-titanium alloy, stainless steel, multi-strand wire, etc. In specific applications, when the anchoring portion needs to be retrieved and repositioned, the remote limiting ring 120 is located between the remote sleeve 130 and the remote limiting portion 310, and the two remote traction ropes move away from the remote anchor body 110. During the movement, the junction of the two remote traction ropes will touch the remote limiting ring 120, and with the continuous movement of the two remote traction ropes, the remote limiting ring 120 will switch from the first expanded position to the first contracted position.

[0089] As a preferred mode of the present application, the end of the remote traction member 411 away from the remote traction ring 412 and the end of the proximal traction member 421 away from the proximal traction ring 422 are knotted to form a closed loop, so as to facilitate the movement of the remote traction member 411 and the proximal traction member 421.

[0090] In one embodiment of the present invention, reference is made to... Figure 12 The unlocking unit 400 includes a distal traction rope 414 and a proximal traction rope. The first end of the distal traction rope 414 passes through the distal limiting ring 120 away from the distal limiting part 310 and extends in a direction away from the distal limiting part 310. The second end of the distal traction rope 414 extends in a direction away from the distal limiting part 310. The first end of the proximal traction rope passes through the proximal limiting ring 220 away from the proximal limiting part 320 and extends in a direction away from the proximal limiting part 320. The second end of the proximal traction rope extends in a direction away from the proximal limiting part 320.

[0091] In practical applications, when the anchoring part needs to be retrieved and repositioned, the two ends of the traction rope 414 move away from the far-end anchor body 110 towards the far-end limiting part 310, thereby causing the far-end limiting ring 120 to pass through the far-end limiting part 310, so that the far-end anchor body 110 switches from the first expanded position to the first contracted position. At the same time, the two ends of the traction rope move away from the near-end anchor body 210 towards the near-end limiting part 320, thereby causing the near-end limiting ring 220 to pass through the near-end limiting part 320, so that the near-end anchor body 210 switches from the second expanded position to the second contracted position.

[0092] As a preferred embodiment of the present invention, the presence of two ropes, such as the distal pull rope and the proximal pull rope 423, can be intertwined to form a braid shape, and only a closed loop needs to be left at the junction.

[0093] As another preferred embodiment of the present invention, the presence of a distal pull cord and a proximal pull cord 423, which can be divided into two strands, can also combine the two strands of the cord into the heat shrink tubing, requiring only a closed loop at the junction.

[0094] Reference Figure 7 A distal notch 131 is provided on the outer circumferential surface of the second end of the distal sleeve 130, and the first end of the guide member 430 passes through the distal notch 131 into the distal sleeve 130.

[0095] In practical applications, the first end of the guide 430 is directly inserted into the distal cannula 130 through the distal notch 131, and is fixed in the distal cannula 130 by its own bending deformation and friction with the inner wall of the distal cannula 130. This prevents the guide 430 from being pulled out of the blood vessel and puncturing the blood vessel during the implantation and delivery process of the annular device, thus ensuring the normal progress of the implantation operation.

[0096] As a preferred embodiment of the present invention, refer to Figure 7 andFigure 13 The outer circumferential surface of the distal sleeve 130 is provided with a displacement part, a first end of the displacement part is communicated with the distal opening 131, and a second end of the displacement part extends to the end surface of the second end of the distal sleeve 130. The guide part 430 is placed in the displacement part and passes into the distal sleeve 130 through the distal opening 131.

[0097] The displacement part can be a displacement hole, a displacement groove or a displacement plane. In the embodiment of the present application, the displacement part is a displacement plane. Specifically, the displacement plane is a flat plane, which can be processed by mechanical processing or by flattening under pressure.

[0098] In a specific application, the first end of the guide part 430 is placed on the displacement part and passes into the distal sleeve 130 through the distal opening 131. The displacement part is arranged to keep the guide part 430 as horizontal as possible during the process of passing into the distal sleeve 130. On the one hand, this achieves the purpose of limiting the first end of the guide part 430 within the distal sleeve 130. On the other hand, this also reduces the friction between the guide part 430 and the inner wall of the distal sleeve 130, thereby facilitating the guide part 430 to be pulled out of the distal sleeve 130 more smoothly after unlocking.

[0099] Referring to Figure 14 The distal sleeve 130 is provided with a fixing part 140, and the guide part 430 is threadedly connected with the fixing part 140.

[0100] In the embodiment of the present application, the fixing part 140 is a fixing tube, the inner wall of the fixing tube is provided with internal threads, and the outer circumferential surface of the first end of the guide part 430 is provided with external threads to fix the end of the first end of the guide part 430. Specifically, the fixing part 140 is fixedly connected to the outer circumferential surface of the distal sleeve 130 or the inside of the distal sleeve 130 by mechanical processing. Of course, in other examples, the fixing part 140 can also be fixedly connected to the outer circumferential surface of the distal sleeve 130 or the inside of the distal sleeve 130 by welding.

[0101] In the embodiment of the present application, the distal limiting ring 120 includes a distal limiting ring body and a distal auxiliary ring. The distal auxiliary ring is arranged on one side of the distal limiting ring body and is connected with the distal auxiliary ring. The guide part 430 passes through the distal auxiliary ring.

[0102] In the embodiment of the present application, the distal auxiliary ring is fixedly connected to the distal limiting ring body by mechanical processing. Of course, in other examples, the distal auxiliary ring can also be fixedly connected to the distal limiting ring body by welding.

[0103] In a specific application, the first end of the guide member 430 passes through the distal auxiliary ring, and then passes into the distal sleeve 130 through the distal opening 131, or is directly screwed into the fixing member 140. The distal auxiliary ring is arranged to limit the guide member 430, so as to avoid displacement, folding and arching of the guide member 430 when the anchoring part is released into the blood vessel and the anchoring part is recovered, and to ensure normal development of the anchoring operation and the recovery operation of the anchoring part.

[0104] With reference to Figure 10 and Figure 15 , the proximal limiting ring 220 is formed with a first through hole 221 and a second through hole 222, the connecting member 300 passes through the first through hole 221 and the second through hole 222 and passes into the proximal sleeve 230, and the guide member 430 passes through the second through hole 222 and is located outside the proximal sleeve 230.

[0105] In the embodiment of the present application, the proximal limiting ring 220 has two limiting rings, the cross-sectional area of the inner ring of the limiting ring close to the proximal anchor body 210 is greater than the cross-sectional area of the inner ring of the limiting ring away from the proximal anchor body 210. Of course, in other examples, the cross-sectional area of the inner ring of the limiting ring close to the proximal anchor body 210 can be smaller than the cross-sectional area of the inner ring of the limiting ring away from the proximal anchor body 210, as long as the cross-sectional areas of the inner rings of the two limiting rings are different. The above design avoids the mutual entanglement of the guide member 430 and the connecting member 300, which affects the normal development of the unlocking operation.

[0106] As a preferred mode of the embodiment of the present application, with reference to Figure 9 , the connecting member 300 is a connecting rod, and the connecting rod is formed with a winding limiting portion 330, and the guide member 430 passes through the winding limiting portion 330.

[0107] In the embodiment of the present application, the winding limiting portion 330 can be spiral-shaped or square-shaped, and the shape of the winding limiting portion 330 only needs to be able to limit the guide member 430. The winding limiting portion 330 is arranged to limit the guide member 430, so as to avoid displacement, folding and arching of the guide member 430 when the anchoring part is released into the blood vessel and the anchoring part is recovered, and to ensure normal development of the anchoring operation and the recovery operation of the anchoring part.

[0108] In one embodiment of the embodiment of the present application, with reference to Figure 16The outer circumferential surface of the first end of the proximal sleeve 230 is provided with a proximal opening 231, the guide member 430 penetrates into the proximal sleeve 230 from the proximal opening 231 and penetrates out of the first end of the proximal sleeve 230 towards the distal sleeve 130, and the two ends of the proximal anchor body 210 penetrate into the proximal sleeve 230 from the proximal opening 231 and are connected with the proximal sleeve 230. The above design achieves the limitation of the guide member 430, avoids the displacement, folding and arching of the guide member 430 when the anchor is released into the blood vessel and the anchor is recovered, and ensures the normal development of the anchoring operation and the recovery operation of the anchor.

[0109] In another embodiment of the present application, referring to Figure 17 The proximal anchor 200 further comprises a limiting tube 240, the limiting tube 240 is arranged on the outer circumferential surface of the proximal sleeve 230, and the guide member 430 penetrates through the limiting tube 240. Specifically, the limiting tube 240 is fixedly connected to the outer circumferential surface of the proximal sleeve 230. The above design achieves the limitation of the guide member 430.

[0110] In another embodiment of the present application, the proximal anchor 200 further comprises a limiting tube 240, the limiting tube 240 is arranged on the outer circumferential surface of the proximal sleeve 230, and the guide member 430 penetrates through the limiting tube 240. Meanwhile, the outer circumferential surface of the first end of the proximal sleeve 230 is provided with a proximal opening 231, the guide member 430 penetrates into the proximal sleeve 230 from the proximal opening 231 and penetrates out of the first end of the proximal sleeve 230 towards the distal sleeve 130, and the two ends of the proximal anchor body 210 penetrate into the proximal sleeve 230 from the proximal opening 231 and are connected with the proximal sleeve 230. In a specific application, the first end of the guide member 430 first penetrates through the limiting tube 240, then penetrates into the proximal sleeve 230 through the proximal opening 231 and penetrates out of the first end of the proximal sleeve 230. The above design also achieves the limitation of the guide member 430.

[0111] As a preferred mode of the present application, the connecting member 300 is two connecting rods, one of the two connecting rods is provided with a winding limiting portion 330, and the guide member 430 penetrates through the winding limiting portion 330.

[0112] In the present application, the winding limiting portion 330 can be spiral-shaped or square-shaped, and the shape of the winding limiting portion 330 only needs to be capable of limiting the guide member 430. The winding limiting portion 330 achieves the limitation of the guide member 430, avoids the displacement, folding and arching of the guide member 430 when the anchor is released into the blood vessel and the anchor is recovered, and ensures the normal development of the anchoring operation and the recovery operation of the anchor.

[0113] As a preferred mode of the present application, referring to Figure 18The proximal limiting ring 220 comprises a proximal limiting ring body 223 and a proximal auxiliary ring 224. The proximal auxiliary ring 224 is arranged on one side of the proximal limiting ring body 223 and is connected with the proximal limiting ring body 223. The proximal auxiliary ring 224 forms the second through hole 222, and the guide member 430 passes through the proximal auxiliary ring 224.

[0114] In the embodiment of the application, the proximal auxiliary ring 224 is fixedly connected to the proximal limiting ring body 223 in a machining manner. Of course, in other examples, the proximal auxiliary ring 224 can also be fixedly connected to the proximal limiting ring body 223 in a welding manner.

[0115] In a specific application, the first end of the guide member 430 passes through the proximal auxiliary ring 224, then passes through the outside of the proximal sleeve 230, or passes into the proximal sleeve 230 through the proximal opening 231 and outwardly passes out of the first end of the proximal sleeve 230, or passes into the limiting tube 240 and extends in the direction close to the distal anchor 100. The proximal auxiliary ring 224 arranged plays a role of limiting the guide member 430, avoiding the displacement, folding and arching of the guide member 430 when the anchoring part is released into the blood vessel and the anchoring part is recovered, and ensuring the normal development of the anchoring operation and the recovery operation of the anchoring part.

[0116] In a specific embodiment of the present application, referring to Figure 6 The ring shrinking device comprises an anchoring part, an unlocking part 400 and a delivery catheter 700. The anchoring part has an anchoring position expanded to be anchored in a blood vessel and a recovery position capable of being recovered into the delivery catheter 700. The unlocking part 400 is connected with the anchoring part and can drive the anchoring part to switch from the anchoring position to the recovery position. The anchoring part is always in the delivery catheter 700 before being expanded to be anchored in the blood vessel, and the unlocking part 400 is also in the delivery catheter 700.

[0117] Referring to Figures 6 to 9 The anchoring part comprises a distal anchor 100, a proximal anchor 200 and a connecting member 300. The proximal anchor 200 is located on one side of the distal anchor 100. The distal anchor 100 comprises a distal anchor body 110. The distal anchor body 110 has a first expanded position capable of being expanded to be anchored in a blood vessel and a first contracted position capable of being deformed and contracted. The unlocking part 400 can drive the distal anchor body 110 to switch from the first expanded position to the first contracted position. The proximal anchor 200 comprises a proximal anchor body 210. The proximal anchor body 210 has a second expanded position capable of being expanded to be anchored in a blood vessel and a second contracted position capable of being deformed and contracted. The unlocking part 400 can drive the proximal anchor body 210 to switch from the second expanded position to the second contracted position.

[0118] When the distal anchor body 110 is in the first expanded position and the proximal anchor body 210 is in the second expanded position, the anchoring part is in the anchoring position; when the distal anchor body 110 is in the first contracted position and the proximal anchor body 210 is in the second contracted position, the anchoring part is in the recovery position.

[0119] With reference to Figures 6 to 10 , the ring shrinking device further comprises a locking wire 500, a push rod 600 and a delivery handle, wherein the push rod 600 is located on the side of the proximal anchor body 210 away from the distal anchor body 110, both ends of the push rod 600 are open and hollow inside, the delivery handle is arranged at the end of the push rod 600 away from the anchoring part and is connected with the push rod 600; the locking wire 500 is arranged between the anchoring part and the push rod 600, the first end of the locking wire 500 is connected with the anchoring part, and the second end of the locking wire 500 penetrates into the push rod 600 and is fixedly connected with the delivery handle.

[0120] The connecting piece 300 is arranged between the distal anchor 100 and the proximal anchor 200 and is connected with the distal anchor 100 and the proximal anchor 200 respectively; the distal anchor body 110 is wound on the connecting piece 300 to form a distal limiting ring 120, the connecting piece 300 is formed with a distal limiting part 310 on the side of the distal limiting ring 120 close to the proximal anchor 200, and the distal limiting ring 120 is limited on the side of the distal limiting part 310 away from the proximal anchor 200, at this time, the distal anchor body 110 is in the first expanded position; the distal limiting ring 120 is slidably installed on the connecting piece 300, and the unlocking part 400 can drive the distal limiting ring 120 to pass through the distal limiting part 310 along the length direction of the connecting piece 300, so as to switch the distal anchor body 110 from the first expanded position to the first contracted position; the proximal anchor body 210 is wound on the connecting piece 300 to form a proximal limiting ring 220, the connecting piece 300 is formed with a proximal limiting part 320 on the side of the proximal limiting ring 220 away from the distal anchor 100, and the proximal limiting ring 220 is limited on the side of the proximal limiting part 320 close to the distal anchor 100, at this time, the proximal anchor body 210 is in the second expanded position; the proximal limiting ring 220 is slidably installed on the connecting piece 300, and the unlocking part 400 can drive the proximal limiting ring 220 to pass through the proximal limiting part 320 along the length direction of the connecting piece 300, so as to switch the proximal anchor body 210 from the second expanded position to the second contracted position.

[0121] With reference to Figure 7 and Figure 9, the distal end anchor 100 further comprises a distal end sleeve 130, the distal end sleeve 130 has a first end away from the proximal end anchor 200, the two ends of the distal end anchor body 110 can be inserted into the distal end sleeve 130 from the first end of the distal end sleeve 130 and connected with the distal end sleeve 130; the proximal end anchor 200 further comprises a proximal end sleeve 230, the proximal end sleeve 230 has a first end close to the distal end anchor 100, the two ends of the proximal end anchor body 210 can be inserted into the proximal end sleeve 230 and connected with the proximal end sleeve 230. In addition, the first end of the locking wire 500 is inserted into the proximal end sleeve 230.

[0122] The first end of the connecting piece 300 passes through the proximal end sleeve 230 and is inserted into the distal end sleeve 130 and fixedly connected with the inner wall of the distal end sleeve 130, and the second end of the connecting piece 300 forms a proximal end limiting portion 320.

[0123] Referring to Figure 7 and Figure 9 , the distal end anchor body 110 comprises a first body segment, a second body segment and a first intermediate segment, the end of the first body segment is the end of the distal end anchor body 110, the second body segment is formed with a distal end limiting ring 120 on the connecting piece 300, and the first intermediate segment is located between the first body segment and the second body segment and is wound in a threaded shape; specifically, when the distal end anchor body 110 is in the first expanded position, the distance between the first body segment and the second body segment becomes smaller, the distance between the first intermediate segment and the distal end sleeve 130 becomes larger, at this time, the distal end limiting ring 120 is located between the distal end sleeve 130 and the distal end limiting portion 310; when the distal end anchor body 110 is in the first contracted position, the distance between the first body segment and the second body segment becomes larger, the distance between the first intermediate segment and the distal end sleeve 130 becomes smaller, at this time, the distal end limiting ring 120 is located on the side of the distal end limiting portion 310 away from the distal end sleeve 130.

[0124] The proximal end anchor body 210 comprises a third body segment, a fourth body segment and a second intermediate segment, the end of the third body segment is the end of the proximal end anchor body 210, the second body segment is formed with a proximal end limiting ring 220 on the connecting piece 300, and the second intermediate segment is located between the third body segment and the fourth body segment and is wound in a threaded shape; specifically, when the proximal end anchor body 210 is in the second expanded position, the distance between the third body segment and the fourth body segment becomes smaller, the distance between the second intermediate segment and the proximal end sleeve 230 becomes larger, at this time, the proximal end limiting ring 220 is located between the proximal end sleeve 230 and the proximal end limiting portion 320; when the proximal end anchor body 210 is in the second contracted position, the distance between the third body segment and the fourth body segment becomes larger, the distance between the second intermediate segment and the proximal end sleeve 230 becomes smaller, at this time, the proximal end limiting ring 220 is located on the side of the proximal end limiting portion 320 away from the proximal end sleeve 230.

[0125] Referring to Figures 6 to 10, the unlocking part 400 comprises a distal traction part 410, a proximal traction part 420 and a guide part 430; the distal traction part 410 is located on the side of the distal limiting ring 120 away from the distal limiting part 310, the guide part 430 is arranged through the distal limiting ring 120 and the distal traction part 410, the distal traction part 410 can move along the extension direction of the guide part 430, and the distal traction part 410 can pull the distal limiting ring 120 to pass through the distal limiting part 310 along the length direction of the connecting part 300; the proximal traction part 420 is located on the side of the proximal limiting ring 220 away from the proximal limiting part 320, the guide part 430 is arranged through the proximal limiting ring 220 and the proximal traction part 420, the proximal traction part 420 can move along the extension direction of the guide part 430, and the proximal traction part 420 can pull the proximal limiting ring 220 to pass through the proximal limiting part 320 along the length direction of the connecting part 300.

[0126] With reference to Figures 7 to 10 , specifically, the distal traction part 410 is a distal traction part 411, and a distal traction ring 412 is formed on the distal traction part 411; the distal traction ring 412 is located on the side of the distal limiting ring 120 away from the distal limiting part 310, and the guide part 430 is arranged through the distal traction ring 412; the proximal traction part 420 is a proximal traction part 421, and a proximal traction ring 422 is formed on the proximal traction part 421; the proximal traction ring 422 is located on the side of the proximal limiting ring 220 away from the proximal limiting part 320, and the guide part 430 is arranged through the proximal traction ring 422.

[0127] In addition, the end of the distal traction part 411 away from the distal traction ring 412 and the end of the proximal traction part 421 away from the proximal traction ring 422 are knotted to form closed loops.

[0128] With reference to Figure 7 , Figure 10 and Figure 15 , a distal gap 131 is formed on the outer circumferential surface of the second end of the distal sleeve 130, and the first end of the guide part 430 is arranged into the distal sleeve 130 through the distal gap 131. The proximal limiting ring 220 is provided with a first through hole 221 and a second through hole 222, the connecting part 300 is arranged through the first through hole 221 and the second through hole 222 and into the proximal sleeve 230, and the guide part 430 is arranged through the second through hole 222 and outside the proximal sleeve 230. Specifically, the first end of the guide part 430 is arranged through the second through hole 222 and outside the proximal sleeve 230, and then arranged into the distal sleeve 130 through the distal gap 131 to limit the guide part 430.

[0129] With reference to Figure 9 , the connecting part 300 comprises two connecting rods, and one of the two connecting rods is provided with a winding limiting part 330, and the guide part 430 is arranged through the winding limiting part 330 to limit the guide part 430.

[0130] In another specific embodiment, the difference from the above embodiment is that, referring to Figure 14 , the distal sleeve 130 is provided with a fixing member 140, and the guide member 430 is threadedly connected with the fixing member 140. The fixing member 140 can be a fixing tube, and the inner wall of the fixing tube is provided with an internal thread, and the outer periphery of the first end of the guide member 430 is provided with an external thread, so as to fix the end of the guide member 430.

[0131] Referring to Figure 11 , the proximal traction part 420 is a single rope, and the single rope is folded to form two proximal traction ropes 423, and the intersection of the two proximal traction ropes 423 is located on the side of the proximal limiting ring 220 away from the proximal limiting part 320, and is arranged on the guide member 430, so as to pull the proximal limiting ring 220 to pass through the proximal limiting part 320 along the length direction of the connecting member 300.

[0132] The distal traction part 410 is a single rope, and the single rope is folded to form two distal traction ropes, and the intersection of the two distal traction ropes is located on the side of the distal limiting ring 120 away from the distal limiting part 310, and is arranged on the guide member 430, so as to pull the distal limiting ring 120 to pass through the distal limiting part 310 along the length direction of the connecting member 300.

[0133] In another specific embodiment, the difference from the first embodiment is that, referring to Figure 12 , the unlocking part 400 includes a distal traction rope 414 and a proximal traction rope, wherein the first end of the distal traction rope 414 passes through the distal limiting ring 120 from the side of the distal limiting ring 120 away from the distal limiting part 310, and extends away from the distal limiting part 310 and away from the distal limiting ring 120, and the second end of the distal traction rope 414 extends away from the distal limiting part 310 and away from the distal limiting ring 120; the first end of the proximal traction rope passes through the proximal limiting ring 220 from the side of the proximal limiting ring 220 away from the proximal limiting part 320, and extends away from the proximal limiting part 320 and away from the proximal limiting ring 220, and the second end of the proximal traction rope extends away from the proximal limiting part 320 and away from the proximal limiting ring 220.

[0134] The above is only a preferred embodiment of the present application, and is not used to limit the present application, any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A ring-shrinking device, characterized in that, It includes an anchoring part and an unlocking part (400), the anchoring part having an anchoring position that expands to anchor in the blood vessel and a retrieval position that can be retrieved into the delivery catheter (700); The unlocking part (400) is connected to the anchoring part, and the unlocking part (400) can drive the anchoring part to switch from the anchoring position to the retrieval position; the anchoring part includes a distal anchor (100) and a proximal anchor (200), and the proximal anchor (200) is located on the first side of the distal anchor (100); The distal anchor (100) includes a distal anchor body (110), which has a first expansion position capable of expanding to anchor within the blood vessel and a first contraction position capable of deforming and contracting. After the distal anchor body (110) is released from the delivery catheter (700), the delivery catheter (700) is used to switch the distal anchor body (110) from the first contraction position to the first expansion position. The unlocking part (400) can drive the distal anchor body (110) to switch from the first expansion position to the first contraction position. The proximal anchor (200) includes a proximal anchor body (210) having a second expansion position capable of expanding to anchor within the blood vessel, and a second contraction position capable of deforming and contracting. The annular shrinkage device further includes a push rod (600) and a conveying handle. The push rod (600) is located on the side of the near-end anchor body (210) away from the anchoring part. The conveying handle is located at the end of the push rod (600) away from the anchoring part and is connected to the push rod (600). After the proximal anchor body (210) is released, the push rod (600) is pushed by the delivery handle to switch the proximal anchor body (210) from the second retracted position to the second expanded position; the unlocking part (400) can drive the proximal anchor body (210) from the second expanded position to the second retracted position; When the distal anchor body (110) is in the first expansion position and the proximal anchor body (210) is in the second expansion position, the anchoring part is in the anchoring position; When the distal anchor body (110) is in the first retracted position and the proximal anchor body (210) is in the second retracted position, the anchoring part is in the retracted position; The anchoring part further includes a connector (300), which is disposed between the distal anchor (100) and the proximal anchor (200) and is connected to the distal anchor (100) and the proximal anchor (200) respectively; The distal anchor body (110) has a distal limiting ring (120) wound around the connector (300). The connector (300) has a distal limiting portion (310) on the side of the distal limiting ring (120) close to the proximal anchor (200). The distal limiting ring (120) is limited to the side of the distal limiting portion (310) away from the proximal anchor (200). At this time, the distal anchor body (110) is in the first expansion position. The distal limiting ring (120) is slidably installed on the connector (300), and the unlocking part (400) can drive the distal limiting ring (120) to pass through the distal limiting part (310) along the length direction of the connector (300) so that the distal anchor body (110) switches from the first expansion position to the first contraction position. The proximal anchor body (210) has a proximal limiting ring (220) wound around the connector (300). The connector (300) has a proximal limiting portion (320) on the side of the proximal limiting ring (220) away from the distal anchor (100). The proximal limiting ring (220) is limited to the side of the proximal limiting portion (320) close to the distal anchor (100). At this time, the proximal anchor body (210) is in the second expansion position. The proximal limiting ring (220) is slidably installed on the connector (300), and the unlocking part (400) can drive the proximal limiting ring (220) to pass through the proximal limiting part (320) along the length direction of the connector (300) so that the proximal anchor body (210) switches from the second expansion position to the second contraction position; The unlocking part (400) drives the distal anchor body (110) to switch from the first expansion position to the first contraction position, and the unlocking part (400) drives the proximal anchor body (210) to switch from the second expansion position to the second contraction position, so that the distal anchor body (110) and the proximal anchor body (210) can be smoothly retracted into the delivery conduit (700).

2. The annular contraction device according to claim 1, characterized in that, The unlocking part (400) includes a distal traction part (410), a proximal traction part (420), and a guide (430). The distal traction part (410) is located on the side of the distal limiting ring (120) away from the distal limiting part (310). The guide (430) passes through the distal limiting ring (120) and the distal traction part (410). The distal traction part (410) can move along the extension direction of the guide (430). The distal traction part (410) can pull the distal limiting ring (120) along the length direction of the connector (300) through the distal limiting part (310). The proximal traction part (420) is located on the side of the proximal limiting ring (220) away from the proximal limiting part (320). The guide (430) passes through the proximal limiting ring (220) and the proximal traction part (420). The proximal traction part (420) can move along the extension direction of the guide (430). The proximal traction part (420) can pull the proximal limiting ring (220) along the length direction of the connector (300) through the proximal limiting part (320).

3. The annular contraction device according to claim 2, characterized in that, The distal traction portion (410) is a distal traction member (411), on which a distal traction ring (412) is formed. The distal traction ring (412) is located on the side of the distal limiting ring (120) away from the distal limiting portion (310), and the guide member (430) passes through the distal traction ring (412); or, The distal traction part (410) is a single rope, which is folded in half to form two distal pull ropes. The junction of the two distal pull ropes is located on the side of the distal limiting ring (120) away from the distal limiting part (310) and is laid on the guide member (430) to pull the distal limiting ring (120) along the length direction of the connector (300) through the distal limiting part (310).

4. The annular contraction device according to claim 2, characterized in that, The proximal traction portion (420) is a proximal traction member (421), on which a proximal traction ring (422) is formed. The proximal traction ring (422) is located on the side of the proximal limiting ring (220) away from the proximal limiting portion (320), and the guide member (430) passes through the proximal traction ring (422); or, The proximal traction part (420) is a single rope, which is folded in half to form two proximal pull ropes (423). The intersection of the two proximal pull ropes (423) is located on the side of the proximal limiting ring (220) away from the proximal limiting part (320) and is laid on the guide (430) to pull the proximal limiting ring (220) through the proximal limiting part (320) along the length direction of the connector (300).

5. The annular contraction device according to claim 1, characterized in that, The unlocking part (400) includes a distal traction rope (414) and a proximal traction rope, wherein the first end of the distal traction rope (414) passes through the distal limiting ring (120) away from the distal limiting part (310) from the side of the distal limiting ring (120) and extends in the direction away from the distal limiting part (120) from the distal limiting part (310), and the second end of the distal traction rope (414) extends in the direction away from the distal limiting part (310) from the distal limiting ring (120); The first end of the proximal traction rope passes through the proximal limiting ring (220) from the side of the proximal limiting portion (320) away from the proximal limiting ring (220) and extends in a direction away from the proximal limiting portion (320) away from the proximal limiting ring (220); the second end of the proximal traction rope extends in a direction away from the proximal limiting portion (320) away from the proximal limiting ring (220).

6. The annular contraction device according to claim 2, characterized in that, The distal anchor (100) further includes a distal sleeve (130), the end of the distal sleeve (130) away from the proximal anchor (200) is the first end, and both ends of the distal anchor body (110) can pass through the first end of the distal sleeve (130) into the distal sleeve (130) and are connected to the distal sleeve (130). The proximal anchor (200) also includes a proximal sleeve (230), the end of the proximal sleeve (230) near the distal anchor (100) is the first end, and both ends of the proximal anchor body (210) can be inserted into the proximal sleeve (230) and connected to the proximal sleeve (230).

7. The annular contraction device according to claim 6, characterized in that, A distal notch (131) is provided on the outer peripheral surface of the second end of the distal sleeve (130), and the first end of the guide (430) passes through the distal notch (131) into the distal sleeve (130).

8. The annular contraction device according to claim 7, characterized in that, The outer peripheral surface of the distal sleeve (130) is provided with a clearance portion. The first end of the clearance portion is connected to the distal notch (131). The second end of the clearance portion extends to the end face of the second end of the distal sleeve (130). The guide (430) is placed in the clearance portion and passes through the distal notch (131) into the distal sleeve (130).

9. The annular contraction device according to claim 6, characterized in that, A fixing member (140) is provided on the distal sleeve (130), and the guide member (430) is threadedly connected to the fixing member (140).

10. The annular contraction device according to claim 7 or 9, characterized in that, The distal limiting ring (120) includes a distal limiting ring body and a distal auxiliary ring. The distal auxiliary ring is disposed on one side of the distal limiting ring body and connected to the distal limiting ring body. The guide (430) passes through the distal auxiliary ring.

11. The annular contraction device according to claim 6, characterized in that, The proximal limiting ring (220) has a first through hole (221) and a second through hole (222). The connector (300) passes through the first through hole (221) and the second through hole (222) and enters the proximal sleeve (230). The guide (430) passes through the second through hole (222) and is located outside the proximal sleeve (230).

12. The annular contraction device according to claim 11, characterized in that, The connector (300) consists of two connecting rods, one of which has a winding limiting part (330), and the guide (430) passes through the winding limiting part (330).

13. The annular contraction device according to claim 11, characterized in that, The outer peripheral surface of the first end of the proximal sleeve (230) is provided with a proximal notch (231), and the guide (430) passes through the proximal notch (231) into the proximal sleeve (230) and passes out from the first end of the proximal sleeve (230) toward the distal sleeve (130). Both ends of the proximal anchor body (210) pass through the proximal notch (231) into the proximal sleeve (230) and are connected to the proximal sleeve (230); and / or, The proximal anchor (200) further includes a limiting tube (240), which is disposed on the outer periphery of the proximal sleeve (230) and connected to the proximal sleeve (230), and the guide (430) passes through the limiting tube (240).

14. The annular contraction device according to claim 13, characterized in that, The connector (300) consists of two connecting rods, one of which has a winding limiting part (330), and the guide (430) passes through the winding limiting part (330).

15. The annular contraction device according to any one of claims 11 to 14, characterized in that, The proximal limiting ring (220) includes a proximal limiting ring body (223) and a proximal auxiliary ring (224). The proximal auxiliary ring (224) is disposed on one side of the proximal limiting ring body (223) and connected to the proximal limiting ring body (223). The proximal auxiliary ring (224) forms the second through hole (222), and the guide (430) passes through the proximal auxiliary ring (224).

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