CN115715715A - Ring-shrinking device and ring-shrinking system - Google Patents

Abstract

The invention discloses a ring-shrinking device, wherein the ring-shrinking device (100) is provided with a first ring part (110) and a second ring part (120), a first connecting part (130) is arranged between the first ring part (110) and the second ring part (120), the ring-shrinking device (100) further comprises a locking component (300), the locking component (300) can at least cover a partial area of the first connecting part (130), and the locking component (300) provides pressing force for the first connecting part (130) to fix the first connecting part (130); in the ring-contracting device of the present invention, the locking assembly (300) is wrapped on the first connecting portion (130) and provides a pressing force to fix the first connecting portion (130), and since a fixing means is added to the first connecting portion (130) between the first ring portion (110) and the second ring portion (120), the position of the first connecting portion (130) of the ring-contracting device (100) is not easily deformed or dislocated when the ring-contracting device is loaded into a loader and an implant is released in vivo, the present invention also provides a ring-contracting system.

Description

Ring shrinking device and ring shrinking system

Technical Field

The invention relates to the field of medical instruments, in particular to an annular shrinking device and an annular shrinking system.

Background

This section provides background information related to the present disclosure only and is not necessarily prior art.

The mitral valve is a part of the heart, located between the left atrium and the left ventricle. The left ventricle is pumped by the left atrium, and when the left ventricle contracts to pump blood throughout the body, the mitral valve closes to prevent blood from being pumped back into the left atrium. In some patients, the mitral valve fails to close normally, whether due to genetic malformation, disease, or injury, resulting in a condition known as regurgitation, i.e., blood is pumped into the atrium with each contraction of the myocardium. Reflux is a severe, often rapidly deteriorating condition that reduces the efficiency of the cycle and must be corrected.

There are several more common ways of repairing mitral regurgitation, either surgery or minimally invasive interventions.

Surgery supports the mitral valve by replacing it with a mechanical valve, securing it near the mitral valve, or suturing some ring. Cardiac surgery is a high risk procedure because of the need to open the chest of the patient to gain access to the heart and the need for external circulation assistance, and is therefore not the treatment of choice.

Minimally invasive interventional surgery is a procedure that utilizes a vascular access in the human body to deliver an implant to a desired location via a catheter. The main intervention methods include artificial chordae tendineae implantation, mitral valve annuloplasty, mitral valve rim-to-rim repair, and the like. The mitral valve annuloplasty includes two types, namely direct annuloplasty and indirect annuloplasty, and the indirect annuloplasty mainly involves the use of tightening of vascular tissues around the mitral valve annulus to contract the mitral valve annulus, so that the mitral valve leaflets can be tightly closed. The ring-reduction device is used as an implant and is placed in the coronary sinus-great cardiac vein for ring-reduction to reduce mitral regurgitation, and the ring-reduction device is arranged around the blood vessel around the mitral valve ring, which is one of the best positions for indirect ring-reduction.

Disclosure of Invention

Based on the above, the invention provides a locking device, and a locking assembly of the locking device can solve the technical problem that a first connecting part in an anchor of a ring-type shrinking device is deformed or misplaced in the pushing and releasing process.

In order to achieve the purpose, the invention adopts the following technical scheme:

in a first aspect of the present invention, a ring-contracting device 100 is provided with a first ring part 110 and a second ring part 120, and a first connecting part 130 is provided between the first ring part 110 and the second ring part 120, the ring-contracting device 100 further includes a locking assembly 300, the locking assembly 300 can cover at least a partial area of the first connecting part 130, and the locking assembly 300 provides a pressing force to the first connecting part 130 to fix the first connecting part 130.

The invention provides a ring-contracting device, which coats the whole area or partial area of a first connecting part between a first ring part and a second ring part with a locking component, and provides pressing force to fix the first connecting part; the pressing force provided by the locking component in the ring shrinkage device can increase the friction between the first connecting part and the surface of the locking component, so that the first connecting part is fixed and prevented from deforming; the locking assembly also provides support against misalignment of the first connecting portion in the anchor.

In some embodiments of the present invention, the locking device 100 includes a sleeve 310, and the sleeve 310 is sleeved on the first connecting portion 130 and is connected to the first connecting portion 130 in a pressing manner.

In some embodiments of the ring-contracting device of the present invention, the sleeve 310 includes a first sleeve 320 and a second sleeve 330, wherein the first sleeve 320 is sleeved and pressed on a partial region of the first connecting portion 130 close to the first ring portion 110, and the second sleeve 330 is sleeved and pressed on a partial region of the first connecting portion 130 close to the second ring portion 120.

In some embodiments of the present invention, the first sleeve 320 and the second sleeve 330 have a polygonal or elliptical cross-section.

In some embodiments of the ring-retracting device of the present invention, a partial region of the first sleeve 320 and/or the second sleeve 330 is formed into a plurality of pressing teeth 340, and the pressing teeth 340 are pressed against the first connecting portion 130.

In some embodiments of the present invention, the locking assembly 300 comprises a spiral coil 210 formed by spirally winding the wire 200, wherein the spiral coil 210 is sleeved on the first connecting portion 130, and a plurality of connecting points 211 are disposed between the spiral coil 210 and the first connecting portion 130.

In some embodiments of the present invention, the first connection portion 130 is provided with a plurality of connection points 211 welded at both ends of the spiral coil 210.

In some embodiments of the present ring-collapsing device, the wire 200 has an outer diameter of 0.1mm to 1mm, and the helical coil 210 has an outer diameter of 1mm to 2mm.

In some embodiments of the present invention, the locking assembly 300 comprises a biocompatible sheet 350, and the sheet 350 covers the first connecting portion 130 and is attached to the outer surface of the first connecting portion 130.

In some embodiments of the ring-contracting device of the present invention, the sheet 350 wraps the first connecting portion 130 along a length direction of the first connecting portion 130, a wrapping path of the sheet 350 at least bypasses a connecting end of the first ring portion 110 and the first connecting portion 130, and bypasses a connecting end of the second ring portion 120 and the first connecting portion 130, and a tail end and a head end of the sheet 350 are connected.

In some embodiments of the ring-shrinking device of the present invention, the sheet 350 is provided with a heat shrinkable tube 360 on the outside, and the heat shrinkable tube 360 applies a pre-load to the sheet 350.

In some embodiments of the ring-contracting device of the present invention, the sheet 350 is made of a polymer material, and the thickness of the sheet 350 is 0.1 to 0.25mm.

In some embodiments of the present ring-down apparatus, the locking assembly 300 comprises a hollow threaded tube 370 having pushability and bendability.

In a second aspect of the invention, there is provided a ring reduction system comprising a distal anchor 400 and a proximal anchor 500, and a connecting assembly between the distal anchor 400 and the proximal anchor 500, at least one of the distal anchor 400 and the proximal anchor 500 being a ring reduction device 100 according to any one of the above;

the ring-contracting device 100 further comprises a first anchor wire 140 and a second anchor wire 150, wherein the first anchor wire 140 and the second anchor wire 150 are wound in a cross-wound and twisted manner to form a first connecting part 130 of the ring-contracting device.

Drawings

FIG. 1 illustrates a block diagram of a retraction system provided by the present invention;

figures 2 and 3 illustrate the malposition of the anchor of the ring system;

figures 4 and 5 illustrate views of the retraction system in the coronary sinus-great cardiac vein showing the normal state of the anchors of the retraction system and showing the malposition after release of the retraction system;

FIG. 6 illustrates an embodiment of the locking assembly in which the sleeve is wrapped around the first connection in the ring compression apparatus of the present invention;

FIG. 7 illustrates an embodiment of the locking assembly in which the sleeve is crimped to the first connection in the ring compression apparatus of the present invention;

FIG. 8 illustrates an embodiment of a first sleeve and a second sleeve of a locking assembly crimped to a first connection in a ring compression apparatus of the present invention;

FIG. 9 illustrates an embodiment of the present invention in which the helical coil of the locking assembly is looped around the first connection;

FIG. 10 illustrates an embodiment of the locking assembly employing a tab wrapped around the first connecting portion in the ring compression apparatus of the present invention;

FIG. 11 illustrates an alternative embodiment of the locking assembly being wrapped around the first connecting portion with a tab in the ring retractor of the present invention;

FIG. 12 illustrates an embodiment in which a heat shrinkable tube is provided outside the sheet in the ring compressing apparatus of the present invention.

The reference numbers are as follows:

100 a constriction device, 110 a first loop portion, 120 a second loop portion, 130 a first connection portion, 140 a first anchor wire, 150 a second anchor wire;

200 filars, 210 helical coils, 211 connection points;

300 locking component, 310 sleeve, 320 first sleeve, 330 second sleeve, 340 pressing tooth;

350 sheets, 351 films, 360 heat-shrinkable tubes and 370 hollow threaded tubes;

400 distal anchors, 500 proximal anchors, 600 anchor wires, 610 cannula, 620 connecting rod;

700 coronary sinus-great cardiac vein, 710 coronary sinus, 720 great cardiac vein, 730 delivery catheter, 740 pushrod, 800 normal release state; 810 misplaced release state.

Detailed Description

In order that the objects, technical solutions and advantages of the present invention will be more clearly understood, exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

It is to be understood that the terminology used herein is for the purpose of describing particular example embodiments only, and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" may be intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises," "comprising," "including," and "having" are inclusive and therefore specify the presence of stated features, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and/or groups thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring their performance in the particular order described or illustrated, unless specifically identified as an order of performance. It should also be understood that additional or alternative steps may be used.

Although the terms first, second, third, etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms may be only used to distinguish one element, component, region, layer or section from another region, layer or section. Terms such as "first," "second," and other numerical terms when used herein do not imply a sequence or order unless clearly indicated by the context. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the example embodiments.

For convenience of description, spatially relative terms, such as "inner", "outer", "lower", "below", "upper", "above", and the like, may be used herein to describe one element or feature's relationship to another element or feature as illustrated in the figures. Such spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" or "over" the other elements or features. Thus, the example term "at 8230; \8230; below" may include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

In the field of interventional medical devices, a medical device implanted in a human or animal body or a delivery system for delivering the medical device is generally referred to as a "proximal end" at a position closer to an operator and a "distal end" at a position farther from the operator, and the "proximal end" and the "distal end" of any component of the medical device or the delivery system are defined according to this principle. "axial" generally refers to the length of the medical device as it is being delivered, and "radial" generally refers to the direction of the medical device perpendicular to its "axial" direction, and defines both "axial" and "radial" directions of any component of the medical device in accordance with this principle.

Fig. 1 illustrates a block diagram of the present invention, and as shown in fig. 1, a distal anchor 400 is disposed at a distal end of the system, a proximal anchor 500 is disposed at a proximal end, and the distal anchor 400 and the proximal anchor 500 are connected together by a sleeve 610 and a connecting rod 620, wherein the distal anchor 400 has a first ring portion 110 and a second ring portion 120, the proximal anchor 500 has a first ring portion 110 and a second ring portion 120, and a first connecting portion 130 is typically disposed between the first ring portion 110 and the second ring portion 120.

The first ring part 110 is formed by surrounding the anchor wire 600, the anchor wire 600 surrounds the first ring part 110 and is divided into the first anchor wire 140 and the second anchor wire 150 at the intersection point, and the first connecting part 130 is formed by the first anchor wire 140 and the second anchor wire 150 which are crossly wound and twisted;

the second ring part 120 is formed by surrounding an anchor wire 600, the anchor wire 600 surrounds the second ring part 120 and is divided into a first anchor wire 140 and a second anchor wire 150 at the intersection point, and the first anchor wire 140 and the second anchor wire 150 are crossly wound between each other in a twisted shape to form a first connecting part 130, so that the first connecting part 130 connects the first ring part and the second ring part;

the anchor wires constituting the first loop portion 110 and the second loop portion 120 may be formed as a single wire; the anchor wires constituting the first ring part 110 and the second ring part 120 may be made of two anchor wires made of the same material;

the anchor wire 600, the first anchor wire 140 and the second anchor wire 150 should be biocompatible, such as one of PTFE, PET or PP.

As can also be seen from fig. 1, the ring-contracting device in the ring-contracting system provided by the present invention is provided with a first ring portion 110 and a second ring portion 120, and a first connecting portion 130 is provided between the first ring portion 110 and the second ring portion 120, and the ring-contracting device further includes a first anchor wire 140 and a second anchor wire 150, wherein the first connecting portion 130 is formed by the first anchor wire 140 and the second anchor wire 150 which are cross-wound and twisted.

Referring to fig. 2, 3, 4 and 5, the present invention provides a retraction system that is introduced into the body from the jugular vein through a delivery catheter 730, the device is implanted in the coronary sinus-great cardiac vein 700, and the distal anchor 400 is anchored at the great cardiac vein 720 using the delivery catheter after the distal anchor 400 is released from the delivery catheter 730; the delivery catheter 730 is withdrawn to release the proximal anchor 500, the proximal anchor 500 is released and the proximal anchor 500 is anchored in the coronary sinus 710 by the pushrod 740, and the ring-and-loop system is anchored in the coronary sinus-great cardiac vein 700 to allow the mitral valve leaflets to close tightly and improve mitral regurgitation.

Figures 2 and 3 illustrate the dislocation of the anchoring elements of the ring system; as shown in fig. 2 and fig. 3, when the ring-contracting system is released and bounced, the first connection portion is dislocated, which causes the deformation of the distal anchor 400 or the proximal anchor 500, which easily causes insufficient supporting force of the distal anchor 400 or the proximal anchor 500 in the blood vessel of the ring-contracting system, and finally, the distal anchor 400 and the proximal anchor 500 cannot be effectively anchored, and the ring-contracting effect is not good after the displacement occurs.

In which fig. 4 and 5 illustrate a state diagram of the ring-contracting system in the coronary sinus-great cardiac vein 700, illustrating a normal release state 800 of the ring-contracting system, and illustrating a dislocation release state 810 after release of the ring-contracting system, and in addition, it is easy to occur that the distal anchor and the proximal anchor of the ring-contracting system cannot be expanded to an optimal state due to too small vessel diameter, resulting in insufficient anchoring force of the distal anchor and the proximal anchor.

Through the analysis, the following defects can be found in the actual operation of the ring-reducing system or the ring-reducing device in the ring-reducing system:

1. when the ring-contracting device is released and bounced in the sheath tube, the first connecting part may be dislocated to cause deformation of the anchor, so that the supporting force of the ring-contracting device in the blood vessel is insufficient, even the far-end anchor and the near-end anchor of the ring-contracting device cannot be effectively anchored, and the ring-contracting effect is poor due to the displacement of the first connecting part of the ring-contracting device;

2. when the vessel diameter is too small, the anchoring element cannot expand to an optimal shape, resulting in insufficient anchoring force.

In order to solve the technical problems, the locking assembly is arranged in the ring-contracting device provided by the invention, and the first connecting part between the first ring part and the second ring part is fixed through the locking assembly, so that the first connecting part in the far-end anchor and the first connecting part in the near-end anchor can not be dislocated no matter the ring-contracting device is installed in the transfer equipment or the ring-contracting device is released in a body; even when the pipe diameter of the blood vessel is small, the first connecting part can be locked, and dislocation is prevented after the ring shrinkage device is released due to the fixing and supporting effects.

The invention provides a ring shrinking device, which coats a locking component on the whole area or partial area of a first connecting part between a first ring part and a second ring part and provides pressing force to fix the first connecting part; the pressing force provided by the locking component in the ring shrinkage device can increase the friction between the first connecting part and the surface of the locking component, so that the first connecting part is fixed and prevented from deforming; the locking assembly also provides support against misalignment of the first connecting portion in the anchor.

The ring-contracting device of the invention adds a fixing mode on the first connecting part of the far-end anchor and the near-end anchor, when the far-end anchor and the near-end anchor are arranged in the loader and release the implant in vivo, the first connecting part can not be easily dislocated, and the risk of implantation can be reduced and the success rate of the operation can be improved by increasing the friction force and the supporting force even if the ring-contracting device is placed in a blood vessel with smaller diameter.

FIG. 6 illustrates an embodiment of the locking assembly in which the collar is wrapped around the first connection in the present ring compression apparatus; as shown in fig. 6, the locking assembly 300 of the ring-retracting device includes a biocompatible sleeve 310, the locking assembly 300 can cover at least a partial region of the first connecting portion, and the locking assembly 300 provides a pressing force to the first connecting portion to fix the first connecting portion 130.

The sleeve 310 may be riveted to the first connection portion 130 of the distal anchor 400 or the proximal anchor 500, and the sleeve 310 may completely cover and compress the first connection portion, and under the action of the sleeve 310, the first connection portion may maintain a predetermined shape in the delivery device and the pushing device, thereby preventing deformation and dislocation, so that a stable position relationship may be maintained between the first ring portion 110 and the second ring portion 120 of the distal anchor 400 or the proximal anchor 500, and the structure of the entire ring-contracting device is more stable.

The casing 310 may be made of metal or nonmetal, and the formed casing 310 should have certain biocompatibility, and 304 stainless steel, 316 stainless steel, cobalt-chromium alloy, etc. with biocompatibility may be used, and preferably, the stainless steel material is used.

The sleeve 310 is connected to the first connection portion in a riveting manner, a six-tooth riveting method can be adopted, specifically, the sleeve 310 is set to be a sleeve with a hexagonal cross section, and the riveted sleeve 310 compresses the first connection portion, so that the sleeve is prevented from rotating; the adjacent outer end faces of the sleeve 310 with the hexagonal section have a certain angle, and the friction directions of different outer end faces and the inner wall of the blood vessel are different, so that the hexagonal sleeve and the blood vessel can be relatively easily fixed and are not easy to slip, and the whole ring-shrinking device has higher efficiency in shrinking in the blood vessel; compared with the sleeve with a circular section, the advantage is more obvious.

The cross-section of the sleeve 310 may be arranged in other polygonal structures according to practical situations, for example, the cross-section is a pentagonal structure or an octagonal structure.

In order to reduce friction during the pushing process of the anchoring element, the two ends of the sleeve 310 may be rounded to protect the blood vessel and prevent the blood vessel from being cut.

FIG. 7 illustrates an embodiment of the locking assembly in which the sleeve is crimped to the first connection in the ring compression apparatus of the present invention; as shown in FIG. 7, after the sleeve 310 is compressed at the first connection portion, a plurality of pressing teeth 340 with a concave tooth-like structure are pressed on the surface of the sleeve 310, so that the concave tooth structure of a part of the sleeve is connected with the first connection portion more tightly, even if the distal anchor or the proximal anchor of the ring-retraction device is in an elongated state in the loader, the sleeve 310 is connected with the first connection portion tightly, and the first connection portion is prevented from sliding out of the sleeve and then is in a separated state.

Specifically, the riveting manner of the sleeve and the first connection portion is as follows:

firstly, pressing a circular sleeve 310 into an elliptical cross section, and extruding the circular sleeve into an elliptical sleeve by using two flat plates which are oppositely arranged; then, sleeving an elliptical sleeve on the first connecting part, wherein the elliptical sleeve can prevent the sleeve from relatively rotating on the first connecting part, and finally pressing teeth on a flat surface of the elliptical sleeve, wherein the tooth pressing on the flat surface means that the teeth are pressed along the minor axis direction of the elliptical section of the sleeve, and the sleeve deforms at the tooth pressing position, so that the pressing teeth can clamp the first connecting part to prevent the sleeve and the first connecting part from relatively moving;

the oval sleeve can achieve the following technical effects: when the ring-shrink device enters the body, the contact surface of the oval sleeve and the blood vessel can be larger, the stress is more uniform, the ring-shrink device is not easy to slip, the implant is easier to generate endothelial climbing attachment in the body, and the ring-shrink device is more stable in the body.

FIG. 8 illustrates an embodiment of a locking assembly in which a first sleeve and a second sleeve are crimped to a first connection in a ring compression apparatus of the present invention; as shown in fig. 8, the locking assembly includes a first sleeve 320 and a second sleeve 330, wherein the first sleeve 320 is sleeved on a side of the first connecting portion close to the first ring portion 110, and the second sleeve 330 is sleeved on a side of the first connecting portion close to the second ring portion 120; as can be seen from fig. 8, the first sleeve 320 and the second sleeve 330 are connected to the first connecting portion by the teeth pressing manner as described above, which is different from the above embodiments in that the material used for the sleeves is significantly reduced, the material used for the ring-shrink device implanted into the human body is reduced, the implantation risk of the ring-shrink device in the human body is reduced, but the contact area between the implant in the human body and the vessel wall is the same as the contact area between the implant and the vessel wall, and the implant is uniformly stressed.

FIG. 9 illustrates an embodiment of the locking assembly in which a helical wire is engaged with the first connection in the ring compression apparatus of the present invention; as shown in fig. 9, the locking assembly 300 includes a spiral coil 210 formed by spirally winding a biocompatible wire 200, wherein the spiral coil 210 is sleeved on the first connecting portion and a plurality of connecting points 211 are disposed between the first connecting portion and the spiral coil 210.

The spiral coil 210 has a spring housing structure with certain elasticity, and the spiral coil 210 is formed by winding a biocompatible metal wire or a non-metal wire.

The spiral coil 210 is sleeved on the first connection portion, and the length of the spiral coil 210 is adapted to the length of the first connection portion, and a plurality of connection points 211 are disposed between the spiral coil 210 and the first connection portion.

In this embodiment, when the first connection portion of the distal anchor or the proximal anchor is temporarily pulled, the spiral coil 210 and the first connection portion can be elongated together, and when the pulling force is removed, the first connection portion can be restored to the original state under the elastic force of the spiral coil 210; in which the connection point 211 of the spiral coil 210 to the first connection portion, the spiral coil 210 may be spot-welded to the first connection portion using a laser spot welding machine.

The wire diameter of the wire or the non-wire constituting the spiral coil 210 may be 0.1mm to 1mm, and the outer diameter of the spiral coil 210 is preferably 1mm to 2mm.

In another embodiment of the present invention, the locking assembly of the ring-retraction device may also be a hollow threaded tube, which has a certain pushing and bending properties, and the good pushing and bending properties can facilitate the transportation of the ring-retraction device in the delivery catheter and the body.

FIG. 10 illustrates an embodiment of the locking assembly employing a tab wrapped around the first connecting portion in the ring compression apparatus of the present invention; as shown in fig. 10, the locking assembly includes a biocompatible sheet 350, and the sheet 350 is wrapped on the first connecting portion and attached to the outer surface of the first connecting portion.

FIG. 11 illustrates an alternative embodiment of the locking assembly being wrapped around the first coupling portion with a tab in the ring retractor of the present invention; as shown in fig. 11, the thin sheet of the locking component may be made of biocompatible metal or nonmetal, such as nickel titanium thin sheet or 316 stainless steel thin sheet, the thin sheet may also be made of thin film 351 made of polymer material, such as PTFE film, or may also be made of PEBAX, PET, PA, etc. with good biocompatibility, and the wrapping thickness may be selected from 0.5mm to 1mm;

fig. 12 illustrates an embodiment in which a heat shrinkable tube is disposed outside a sheet in a ring-shrinking device of the present invention, and as shown in fig. 12, when a polymer material is used as a film to wrap a first connection portion, a pre-tightening force should be applied to the outside of the film by using the heat shrinkable tube 360 after the film is wrapped on the first connection portion, so that the film can be wrapped on the first connection portion more firmly.

Specifically, the heat shrinkable tube can enable the PTFE film to firmly wrap the first connecting part at the high temperature of the air heater, and after the heat shrinkable tube is drawn away, the shape of the first connecting part is basically shaped, so that the first connecting part cannot be easily loosened. According to the experiment test, the pressure value of the flat plate is 2.065N-5.968N, the PTEF membrane can completely bear the pressure value, and even if the first connecting part is extruded, the PTEF membrane cannot be propped open, and the PTEF membrane cannot be loosened.

In addition, the friction coefficient of the PTEF material is extremely small, so that the friction between the loader and the sheath can be reduced to the maximum extent; the heat shrinkable tube has various shrinkage ratios and can be used according to actual conditions; the high polymer material is used as the first connecting part of the film coating, so that the whole locking assembly is more exquisite, the size of the ring shrinkage device cannot be changed greatly, and the requirements of the human body implant are met better.

In an embodiment of the present invention, as shown in fig. 10, a sheet 350 wraps the first connecting portion 130 along a length direction of the first connecting portion 130, a wrapping path of the sheet 350 at least bypasses a connecting end of the first ring portion 110 and the first connecting portion 130, and bypasses a connecting end of the second ring portion 120 and the first connecting portion 130, and a tail end of the sheet 350 is overlapped on a head section of the sheet 350; in this embodiment, the sheet 350 is wrapped longitudinally around the first connecting portion 130, and since the first connecting portion 130 has a protruding portion, after the sheet 350 is attached to the protruding portion of the first connecting portion 130, the protruding portion can block the sheet and prevent the sheet from moving around, so that the sheet 350 can be well connected to the first connecting portion 130, thereby preventing the first connecting portion 130 from deforming and preventing the distal anchor 400 or the proximal anchor 500 from deforming or dislocating.

The edges of the sheets can be arranged in a round angle, so that the sheets are more smooth, and the blood vessels are prevented from being scratched; when the ring-type contracting device is implanted into a body, the thin sheet is tightly adhered to the wall of the blood vessel, so that the thin sheet is not easy to fall off.

The ring-contracting device of the invention adds a fixing mode on the first connecting part of the far-end anchor and the near-end anchor, so that the first connecting part can not be easily deformed; the first connecting part is fixed more firmly by using a sleeve or welding mode; the first connecting part can not be deformed or misplaced in the conveying process and the releasing process, the supporting force and the friction force are increased, and the operation risk and the operation cost are reduced.

In conclusion, the ring-contracting device of the present invention aims to solve the problem that the first connecting part of the transcatheter mitral ring-contracting implant is prone to dislocation when released in vivo; and the stable structure of the far-end anchor or the near-end anchor can be ensured, and the supporting force and the friction force of the implant in the body are increased.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent should be subject to the appended claims.

Claims (13)

1. A ring-collapsing device, the ring-collapsing device (100) being provided with a first ring part (110) and a second ring part (120), and a first connecting part (130) being provided between the first ring part (110) and the second ring part (120), characterized in that,

the ring-retracting device (100) further comprises a locking assembly (300), wherein the locking assembly (300) can cover at least partial area of the first connecting part (130), and the locking assembly (300) provides pressing force to the first connecting part (130) to fix the first connecting part (130).

2. The ring-retracting device according to claim 1, wherein the locking device (100) comprises a sleeve (310), and the sleeve (310) is sleeved on the first connecting portion (130) and is in compression connection with the first connecting portion (130).

3. The ring-down device according to claim 2, wherein the sleeve (310) comprises a first sleeve (320) and a second sleeve (330), wherein,

the first sleeve pipe (320) is sleeved and pressed on a partial area of the first connecting part (130) close to the first ring part (110),

the second sleeve pipe (330) is sleeved and pressed on a partial area of the first connecting part (130) close to the second ring part (120).

4. A device according to claim 3, characterized in that the cross-section of the first and second sleeves (320, 330) is of polygonal or elliptical configuration.

5. An encirclement device according to claim 3 or 4, characterized in that a partial region of the first sleeve (320) and/or the second sleeve (330) is formed into a plurality of press teeth (340), and the press teeth (340) are pressed against the first connection (130).

6. The ring-retracting device according to claim 1, wherein the locking assembly (300) comprises a spiral coil (210) formed by spirally winding a wire-like member (200), the spiral coil (210) is sleeved on the first connecting portion (130), and a plurality of connecting points (211) are arranged between the spiral coil and the first connecting portion (130).

7. The ring-shortening device according to claim 6, wherein the first connection portion (130) is provided with a plurality of connection points (211) welded at both ends of the helical coil (210).

8. An annular compression device according to claim 6 or 7, wherein the outer diameter of the wire (200) is 0.1mm to 1mm and the outer diameter of the helical coil (210) is 1mm to 2mm.

9. The ring-retracting device according to claim 1, wherein the locking assembly (300) comprises a sheet (350), and the sheet (350) covers the first connecting part (130) and is attached to the outer surface of the first connecting part (130).

10. A ring-shortening device according to claim 9, wherein the sheet (350) wraps around the first connection portion (130) along the length of the first connection portion (130), the wrapping path of the sheet (350) at least bypasses the connection end of the first ring portion (110) and the first connection portion (130) and bypasses the connection end of the second ring portion (120) and the first connection portion (130), and the trailing end and the leading end of the sheet (350) are connected.

11. The ring-shrinking device according to claim 10, wherein a heat-shrinkable tube (360) is provided outside the thin sheet (350), and the heat-shrinkable tube (360) applies a pre-tightening force to the thin sheet (350).

12. The ring-retracting device according to claim 1, wherein the locking assembly (300) comprises a hollow threaded tube (370) having pushability and bendability.

13. An annular reduction system, comprising a distal anchor (400) and a proximal anchor (500), and a connecting assembly between the distal anchor (400) and the proximal anchor (500), wherein at least one of the distal anchor (400) and the proximal anchor (500) is an annular reduction device (100) according to any one of claims 1-12;

the ring-type contracting device (100) further comprises a first anchor wire (140) and a second anchor wire (150), wherein the first anchor wire (140) and the second anchor wire (150) are wound in a crossed and twisted manner to form a first connecting part (130) of the ring-type contracting device.

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