Cardiac implant and implant system

Abstract

The invention relates to a cardiac implant and an implant system comprising the same. A cardiac implant configured to advance along a guidewire having an annular or substantially annular distal end includes a body portion, a first connection portion, and a second connection portion. The main body portion includes a straight configuration and a curved configuration, and the main body portion includes a first end and a second end opposite in an axial direction. The first connecting part is connected with the first end of the main body part; the second connecting part is connected with the second end of the main body part; in the propelling process, the main body part is converted into a bent structure from a straight structure, all parts of the main body part can transmit axial force and movement to avoid axial stacking, and the second connecting part and the first connecting part can be connected and locked with each other so as to form a ring together with the main body part in the bent structure. The heart implant can form a ring only through simple and convenient pushing, stacking cannot be generated in the pushing process, and the ring forming difficulty of the heart implant is effectively reduced.

Description

Technical Field

[0001] The present invention relates to the field of medical devices, and in particular to a cardiac implant and an implant system. Background Art

[0002] Repositioning the papillary muscles in the ventricle during cardiac repair surgery can improve prognosis. There is a technique in which a guide wire is first placed and roughly looped around the papillary muscles in the ventricle, and then a loopable device is delivered along the guide wire to reposition the papillary muscles around the papillary muscles in the ventricle. However, in the process of delivering such a loopable device, an additional pulling catheter is required to pull the distal end of the loopable device to drive the loopable device to form a loop, otherwise the loopable device is prone to accumulation, resulting in difficulty in looping. Summary of the invention

[0003] In view of this, the present invention aims to provide a cardiac implant and an implant system that can solve the above problems or at least alleviate the above problems to a certain extent.

[0004] To this end, the present invention provides a cardiac implant on one hand, which is configured to be advanced along a guidewire having an annular or substantially annular distal end, and includes a main body, a first connecting part, and a second connecting part. The main body includes a straight structure and a curved structure, and the main body includes a first end and a second end opposite to each other in the axial direction, the first connecting part is connected to the first end of the main body, and the second connecting part is connected to the second end of the main body; during the advancement process, the main body is transformed from the straight structure to the curved structure, and various parts of the main body can transmit axial force and movement to avoid axial stacking, and the second connecting part and the first connecting part can be connected and locked to each other, thereby forming a ring together with the main body in the curved structure.

[0005] On the other hand, the present invention also provides an implant system, comprising the aforementioned cardiac implant and a delivery device for delivering the cardiac implant, the delivery device comprising a delivery sheath, a receiving assembly, and a capture assembly movably arranged in the inner cavity of the delivery sheath for capturing a guide wire, the receiving assembly being detachably connected to the first connecting portion of the cardiac implant.

[0006] Compared with the existing technology that requires an additional pulling catheter to pull at the distal end to form a loop, the cardiac implant of the embodiment of the present invention is based on its main body with sufficient support. Various parts of the main body can transmit axial force and movement. The cardiac implant can be directly pushed at the proximal end of the cardiac implant to form a loop, without the need for additional equipment to pull at the distal end of the cardiac implant. The operation is simpler and the difficulty of forming a loop of the cardiac implant is effectively reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1A is a schematic diagram of a cardiac implant according to an embodiment of the present invention, wherein the main body portion is in a straight configuration and the first connecting portion is in a first configuration;

[0008] Figure 1B yes Figure 1A Another schematic diagram of a cardiac implant is shown, wherein the main body is in a bent configuration, and the first connecting portion is connected to the second connecting portion, and the main body, the first connecting portion and the second connecting portion together form a ring;

[0009] Figure 1C A structural form of a covering film of a cardiac implant is shown;

[0010] Figure 2A yes Figure 1A A schematic diagram of the main body and the second connecting portion of the cardiac implant and the first covering film covering the main body and the second connecting portion;

[0011] Figure 2B yes Figure 2A A schematic diagram of the main body and the second connecting portion, wherein the first covering film is not shown;

[0012] Figure 2C yes Figure 2B A preformed form of the main body portion and the second connecting portion;

[0013] Figure 2D yes Figure 2B Another preformed form of the main body portion and the second connecting portion shown;

[0014] Figure 2E yes Figure 2B A variation of the main body portion and the second connecting portion shown;

[0015] Figure 2F yes Figure 2B Another variation of the main body portion and the second connecting portion shown;

[0016] Figure 3A yes Figure 1A A schematic diagram of the connection between the first connecting portion and the main body of the cardiac implant;

[0017] Figure 3B yes Figure 3A A schematic diagram showing that the first connecting portion and the main body are bound together by sutures;

[0018] Figure 3C yes Figure 3A Another schematic diagram showing that the first connecting portion and the main body portion are bound together by sutures;

[0019] Figure 3D yes Figure 3AAnother variation in which the first connecting portion and the main body portion are tied together by sutures;

[0020] Figure 3E yes Figure 3A A schematic diagram showing that the first connecting portion is directly connected to the main body portion;

[0021] Figure 4A yes Figure 1A A three-dimensional schematic diagram of a first connecting portion of the cardiac implant shown;

[0022] Figure 4B yes Figure 4A A cross-sectional view of the first connecting portion is shown, which shows two forms of the first elastic piece facing radially inward and radially outward;

[0023] Figure 4C yes Figure 1B A cross-sectional view of the locked connection between the first connection portion and the second connection portion of the cardiac implant;

[0024] Figure 4D yes Figure 4A A perspective schematic diagram showing that the first connecting portion is coated with a second coating film;

[0025] Figure 4E yes Figure 4D Another variation of the first connecting portion being coated with a second coating film;

[0026] Figure 4F yes Figure 4A Another variation of the first connecting portion shown;

[0027] Figure 4G yes Figure 4A Another variation of the first connecting portion shown;

[0028] Figure 4H yes Figure 4A Another variation of the first connecting portion shown;

[0029] Figure 5A is a schematic diagram of a conveying device according to an embodiment of the present invention;

[0030] Figure 5B yes Figure 5A A partial schematic diagram of a delivery sheath assembly and a receiving assembly of the delivery device shown;

[0031] Figure 5C yes Figure 5B A schematic diagram showing the plug-in cooperation between the lock wire of the receiving assembly and the second elastic piece;

[0032] Figure 5D yes Figure 5C A schematic diagram showing the lock wire being unlocked from the second spring piece;

[0033] Figure 5E yes Figure 5B A variation of the lock wire shown;

[0034] Fig. 5F yes Figure 5E A schematic diagram showing the cooperation between the lock wire and the second elastic piece;

[0035] Figure 5G yes Fig. 5F A schematic diagram showing the lock wire being unlocked from the second spring piece;

[0036] Figure 5H yes Figure 5B A variation of the receiving assembly shown;

[0037] Fig.5I yes Figure 5A A schematic diagram of the capture assembly of the delivery device shown, wherein the capture is in an expanded state;

[0038] Figure 5J yes Fig.5I Another schematic diagram of the capture assembly shown, wherein the capture device is in a retracted state;

[0039] Fig. 6A is a partial schematic diagram of an implant system according to an embodiment of the present invention, wherein the locking wire of the receiving component is locked with the first elastic sheet and the second elastic sheet;

[0040] Figure 6B yes Fig. 6A Another schematic diagram of the implant system shown, wherein the lock wire of the receiving component is unlocked from the first spring piece and locked with the second spring piece;

[0041] Figure 6C yes Fig. 6A Another schematic diagram of the implant system shown, wherein the lock wire of the receiving component and the first elastic sheet and the second elastic sheet are all unlocked;

[0042] Fig.6D yes Fig. 6A A variation of the implant system shown, wherein the locking wire of the receiving component is locked with both the first spring piece and the second spring piece;

[0043] Fig. 6E yes Fig.6D Another schematic diagram of the implant system shown, wherein the lock wire of the receiving component and the first elastic sheet and the second elastic sheet are all unlocked;

[0044] Fig. 6F yes Fig. 6A A variation of the implant system shown, wherein the locking wire of the receiving component is locked with both the first spring piece and the second spring piece;

[0045] Figure 6G yes Fig. 6FAnother schematic diagram of the implant system shown, wherein the lock wire of the receiving component and the first elastic sheet and the second elastic sheet are all unlocked;

[0046] Figures 7A-7D is a schematic diagram of an implantation process of a cardiac implant according to an embodiment of the present invention or an operation process of an implantation system according to an embodiment of the present invention;

[0047] Fig. 8A is a schematic diagram of a cardiac implant according to an embodiment of the present invention being applied to valve replacement surgery;

[0048] Figure 8B is a schematic diagram of a cardiac implant according to an embodiment of the present invention applied to chordal regulation surgery; and

[0049] Figure 8C Schematic diagram of a cardiac implant according to an embodiment of the present invention being applied to papillary muscle tightening and regulation surgery. DETAILED DESCRIPTION

[0050] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. In addition, the embodiments described below can be combined with each other as long as there is no contradiction or conflict, and the same or similar concepts or processes may not be repeated in some embodiments.

[0051] First of all, it should be noted that, in this article, "proximal end" refers to the end of the device or element close to the operator. "Distal end" refers to the end of the device or element away from the operator. "Axial" refers to the direction that coincides with or is parallel to the central axis of the device or element. When the device or element is in a straight configuration, the "axial" coincides with or is parallel to the line connecting the proximal center and the distal center. "Radial" refers to the direction that is perpendicular or approximately perpendicular to the axial direction and along the radius or diameter of the device or element. "Circumferential" refers to the direction surrounding the axial direction. "Lateral" refers to the direction that is perpendicular or approximately perpendicular to the axial direction. For axisymmetric devices or elements, such as cylindrical devices or elements, "lateral" and "radial" may coincide.

[0052] It is worth noting that the above-mentioned terms indicating orientation or positional relationship are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0053] refer to Figure 1A and Figure 1BThe cardiac implant 1000 of one embodiment of the present invention includes a main body 1100, a first connection part 1200 and a second connection part 1300. The main body 1100 can be formed as follows: Figure 1A The straight structure shown is transformed into Figure 1B The first connecting portion 1200 is provided at the first end 1101 of the main body 1100, and the second connecting portion 1300 is provided at the second end 1102 of the main body 1100, and the first connecting portion 1200 and the second connecting portion 1300 can be connected and locked to each other. Figure 1A When the cardiac implant 1000 shown is advanced along a guide wire having an annular or substantially annular distal end, the main body 1100 changes from a straight configuration to a curved configuration, and various parts of the main body 1100 are able to transmit axial forces and movements without axial stacking, until the first connecting portion 1200 and the second connecting portion 1300 are connected and locked to each other, thereby forming a structure as shown in FIG. Figure 1B Ring shown.

[0054] Compared with the existing technology that requires an additional pulling catheter to pull at the distal end of the loopable device to form a loop, the cardiac implant 1000 of this embodiment is based on its main body 1100 with sufficient support. Various parts of the main body 1100 can transmit axial force and movement, and the main body 1100 will not be stacked due to being pushed, that is, the physical length between the first end 1101 and the second end 1102 of the main body 1100 (in a straight structure, "physical length" refers to the straight-line distance between the first end 1101 and the second end 1102 of the main body 1100; in a curved structure, "physical length" refers to the arc length between the first end 1101 and the second end 1102 of the main body 1100) remains unchanged, so that the cardiac implant 1000 can be directly and only pushed at the proximal end of the cardiac implant 1000 until the first connecting part 1200 and the second connecting part 1300 are locked and connected to each other to form a loop, without the need for additional equipment to pull the cardiac implant 1000 at the distal end of the cardiac implant 1000. In comparison, the looping operation of the cardiac implant 1000 according to the embodiment of the present invention is relatively simple and convenient, and the difficulty of looping the cardiac implant 1000 is effectively reduced.

[0055] In addition, by comparing Figure 1A and Figure 1B It is not difficult to find that in this embodiment, the first connecting portion 1200 includes a first structure (such as Figure 1A ) and a second structure (as shown) extending axially from the first end 1101 of the main body 1100 Figure 1B(as shown) (it is worth noting that in the second structure, since the main body 1100 is curved, the axis of the main body 1100 is also curved, not a straight line), which means that the first connection part 1200 of this embodiment can move relative to the first end 1101 of the main body 1100. This helps the cardiac implant 1000 to form a smoother shape at the first connection part 1200 and the first end 1101 of the main body 1100. More specifically, when the main body 1100 changes from a straight structure to a curved structure, the first connection part 1200 changes from a straight structure to a curved structure. Figure 1A The first configuration shown is transformed into Figure 1B The second structure is shown, wherein in the first structure, the axis of the first connecting portion 1200 is parallel or approximately parallel to the axis of the main body 1100 in the straight structure (approximately parallel can be interpreted as the acute angle between the two axes is not greater than 30°) and has a lateral interval, and the first connecting portion 1200 flips or swings 180° or nearly 180° relative to the main body 1100; in the second structure, the axis of the first connecting portion 1200 coincides with or approximately coincides with (i.e., nearly coincides with) the axis of the main body 1100 in the curved structure.

[0056] Preferably, the cardiac implant 1000 of this embodiment further comprises a coating film 1400, which covers at least a portion of the main body 1100, the first connection part 1200 and the second connection part 1300, and can reduce the surface friction of the cardiac implant 1000, reduce damage to cardiac tissue, and improve biocompatibility and promote tissue endothelialization. Preferably, the material of the coating film 1400 is selected from expanded polytetrafluoroethylene (ePTFE), polyethylene terephthalate (PET), polyurethane (PU), etc. The coating film 1400 can be connected to at least a portion of the main body 1100, the first connection part 1200 and the second connection part 1300 by suturing, bonding or crimping. In this embodiment, the coating film 1400 comprises a first coating film 1410 covering the outer surface of the main body 1100 and the second connection part 1300 and a second coating film 1420 covering the outer surface of the first connection part 1200. The first coating film 1410 and the second coating film 1420 are both in the shape of a tube with openings at both ends, so as to allow the guide wire to pass through the main body 1100, the first connecting part 1200 and the second connecting part 1300. It can be understood that in other embodiments, such as Figure 1CAs shown, the covering film 1400a may also be an integral piece, and may be connected to the main body 1100, the first connecting part 1200 and the second connecting part 1300 by suturing, bonding or crimping. It is worth noting that the portion of the integral covering film 1400a corresponding to covering the first connecting part 1200 is a tube 1450 with openings at both ends, and the portion 1460 corresponding to covering the first end 1101 has an opening 1461, and the opening 1461 is not blocked by the tube 1450, so as to facilitate the guide wire to enter through the opening 1461 and pass through the main body 1100 and the second connecting part 1300.

[0057] refer to Figure 2A and Figure 2B In this embodiment, the main body 1100 includes a strip structure 1110. The strip structure 1110 is flat and extends continuously in the axial direction. This strip structure 1110 not only provides flexibility for the main body 1100, so that the main body 1100 can be bent along the substantially annular distal end of the guide wire more smoothly, but can also be regarded as a ridge that extends continuously between the first end 1101 and the second end 1102 of the main body 1100. The ridge maintains a constant length during the process of the main body 1100 changing from a straight structure to a curved structure, thereby providing support, being able to transmit axial force and movement without axial stacking, and thus effectively improving the pushing performance of the main body 1100.

[0058] The first end 1101 of the main body 1100 is provided with a first through hole 1103 for connecting with the first connecting portion 1200 (described in detail below). Figure 2A As shown, in addition to the first opening 1411 for passing the guide wire (the first covering film 1410, the main body 1100 and the second connecting part 1300 together form a first channel 1104 for passing the guide wire and is connected to the first opening 1411), the first covering film 1410 also has a second opening 1412 corresponding to the first through hole 1103, so that the first through hole 1103 is connected to the first connecting part 1200.

[0059] like Figure 2BAs shown, in this embodiment, the second connecting portion 1300 provided at the second end 1102 of the main body 1100 includes a first tubular structure 1310. The first tubular structure 1310 includes at least one locking portion 1311, as shown in the figure, including a first locking portion 1311a and a second locking portion 1311b in this embodiment. A locking groove 1312 is formed between the first locking portion 1311a and the second locking portion 1311b and between the second locking portion 1311b and the second end 1102 of the main body 1100, respectively, for cooperating with the first connecting portion 1200 (described in detail below). In order to improve the bendability of the first tubular structure 1310, preferably, a plurality of cutting grooves 1313 are also provided on the first tubular structure 1310. The cutting grooves 1313 are arranged at intervals along the axial direction, preferably evenly spaced. Preferably, the main body 1100 and the second connecting part 1300 are integrally formed (although in other embodiments, the two can also be designed separately and connected to each other), for example, by cutting a round tube. In addition, the main body 1100 and the second connecting part 1300 can also be preformed so that the final ring has a desired shape, such as Figure 2C The circular shape shown or Figure 2D The figure 8-shaped shape shown. The specific preforming process may be, but is not limited to, heat treatment, shaping, etc., which will not be described in detail here. It is also preferred that the main body 1100 and the second connecting part 1300 are made of a hard metal or polymer material with certain supporting properties, such as one or more of nickel-titanium alloy, stainless steel, cobalt-chromium alloy, polytetrafluoroethylene, polyetheretherketone, polyethylene and nylon.

[0060] It can be understood that in other embodiments, the main body 1100 is not limited to the above-mentioned strip structure 1110. Figure 2EAs shown, in addition to the strip structure 1110a, the main body 1100a also includes a second tubular structure 1120a connected between the strip structure 1110a and the second connecting portion 1300. The second tubular structure 1120a is roughly semi-tubular, including two first straight ridges 1121a extending continuously in the axial direction and a plurality of cutting grooves 1122a, the two first ridges 1121a are opposite to each other and spaced apart, the plurality of cutting grooves 1122a are evenly spaced apart in the axial direction, each circle of cutting grooves in the circumferential direction extends between the two first ridges 1121a, and each circle of cutting grooves in the circumferential direction includes only one cutting groove 1122a. Due to the presence of the first ridges 1121a and the strip structure 1110a, the main body 1100a maintains a constant physical length during the transition from a straight structure to a curved structure, and can transmit axial force and movement without axial stacking, thereby effectively improving the pushing performance of the main body 1100a. Due to the presence of the plurality of cutting grooves 1122a, the flexibility of the second tubular structure 1120a is ensured. In addition, the second tubular structure 1120a also improves the adaptability of the ring formed in the end, which can better meet the surgical requirements, such as fitting more closely with the artificial heart valve (this application scenario will be described in detail below).

[0061] Or, if Figure 2F As shown, the main body 1100b includes, in addition to the strip structure 1110a, a second tubular structure 1120b and a third tubular structure 1130b connected between the strip structure 1110a and the second connecting portion 1300. The second tubular structure 1120b can refer to the above Figure 2EThe third tubular structure 1130b is a complete tubular structure, including a plurality of second ridges 1131b (only one complete second ridge 1131b is visible in the figure) and a plurality of cutting grooves 1132b. The plurality of cutting grooves 1132b are evenly spaced not only in the axial direction, but also in the circumferential direction, that is, each circle of cutting grooves in the circumferential direction includes a plurality of spaced cutting grooves 1132b. In particular, each adjacent circle of cutting grooves is also staggered in the circumferential direction, so that the second ridge 1131b is no longer in a straight line, but in a tortuous shape conforming to the staggered arrangement of the cutting grooves 1132b, but each part of the second ridge 1131b is still continuously extended in the axial direction. Due to the existence of the strip structure 1110a, the first ridge 1121a and the second ridge 1131b, the main body 1100b maintains the same physical length during the transition from the straight structure to the curved structure, and can transmit axial force and movement without axial stacking, thereby effectively improving the pushing performance of the main body 1100b. Due to the presence of the plurality of cutting grooves 1132b, the bendability of the third tubular structure 1130b is ensured. In addition, the second tubular structure 1120b and the third tubular structure 1130b also improve the adaptability of the ring finally formed, which can better meet the surgical requirements, such as fitting more closely with the artificial heart valve.

[0062] refer to Figure 3A In this embodiment, the first end 1101 of the main body 1100 is bound and connected to the first connecting part 1200 through a flexible line 1500 (preferably a suture). Specifically, the first connecting part 1200 includes a barrel 1210. The barrel 1210 has a cavity 1211 that runs through itself in the axial direction to form a second channel 1211 for the guide wire to pass through and for the second connecting part 1300 to enter and / or pass through. The barrel 1210 includes a first end 1212 and a second end 1213 that are axially opposite, and a connecting position 1214 is provided on the barrel 1210 near the first end 1212, which is used to be movably connected to the first end 1101 of the main body 1100 through the flexible line 1500. Specifically, the connecting position 1214 includes a second through hole 1215 opened on the barrel wall of the barrel 1210 near the first end 1212 and a connecting wall 1216 located between the second through hole 1215 and the first end 1212. Optionally, the connection position 1214 further includes a recessed portion 1217 recessed from the first end 1212 toward the second through hole 1215. The presence of the recessed portion 1217 helps to provide a receiving position for the first end 1101 of the main body 1100, so that the first end 1101 of the main body 1100 and the first connection portion 1200 can be more smoothly connected after the ring is formed. Figure 3BWhen assembling the main body 1100 and the first connecting part 1200, the flexible wire 1500 can be passed through the first through hole 1103 and the second through hole 1215 in a clockwise or counterclockwise direction for multiple times to wrap the connecting wall 1216 and the hole wall of the first through hole 1103 for multiple turns, and finally tied into a knot, so as to connect the main body 1100 and the first connecting part 1200. However, since the flexible wire is wound in a manner that is not a rigid connection, the first connecting part 1200 can be flipped or swung relative to the first connecting part 1200 to switch between the first structure and the second structure. The specific binding method of the flexible wire 1500 is not limited. For example, it can also be as follows Figure 3C As shown, the flexible wire 1500 first passes through the first through hole 1103 clockwise and wraps around the hole wall of the first through hole 1103, then passes through the second through hole 1215 counterclockwise and wraps around the connecting wall 1216, and the wrapping is repeated for multiple times before tying a knot.

[0063] It is understandable that in other embodiments, the main body 1100 and the first connecting portion 1200 may also be connected by binding in other ways. Figure 3D As shown, the first end 1101c of the main body 1100c in this example includes two first through holes 1103c arranged adjacent to each other in the circumferential direction, the connection position 1214c of the cylinder 1210c of the first connecting part 1200c includes two second through holes 1215c arranged adjacent to each other in the circumferential direction and a connecting wall 1216c located between the first end 1212c of the cylinder 1210c and the two second through holes 1215c, and one first through hole 1103c corresponds to one second through hole 1215c and is connected by a flexible line 1500c. This circumferential parallel connection method can effectively prevent the first connecting part 1200c from swinging or twisting in the circumferential direction relative to the main body 1100c, so that the second connecting part 1300 is easier to align with the cavity 1211c entering the first connecting part 1200c.

[0064] It can also be understood that in other embodiments, the main body 1100 and the first connection part 1200 are not limited to being movably connected by bundling with the flexible wire 1500, but can be movably connected to the main body 1100 and the first connection part 1200 via one or more other intermediate connection elements, which will not be described in detail here. Even, the main body 1100 and the first connection part 1200 can be directly movably connected without any intermediate connection element.

[0065] For example, Figure 3EAs shown, the first connecting portion 1200d also includes a connecting rod 1220 connected to the cylinder 1210d. The connecting rod 1220 is used to be plugged and matched with the first through hole 1103d of the main body 1100d so as to movably connect the first connecting portion 1200d and the main body 1100d. Specifically, the first through hole 1103d of the main body 1100d becomes longer and narrower than the first through hole 1103. The connecting rod 1220 is roughly T-shaped, including a sliding section 1221 protruding and extending from the cylinder 1210d and a limiting section 1222 laterally connected to the sliding section 1221. The length of the limiting section 1222 is greater than the maximum width of the first through hole 1103d. During assembly, the limiting section 1222 is passed vertically (i.e., the length direction of the limiting section 1222 is parallel or approximately parallel to the length direction of the first through hole 1103d) through the first through hole 1103d, and the sliding section 1221 is inserted into the first through hole 1103d, and then the connecting rod 1220 is rotated approximately 90 degrees so that the limiting section 1222 lies across the first through hole 1103d, thereby preventing the connecting rod 1220 from slipping out of the first through hole 1103d. At this time, the sliding section 1221 can be slidably received in the first through hole 1103d, thereby realizing that the first connecting portion 1200 and the main body 1100d can be movably connected.

[0066] refer to Figure 4A In this embodiment, the cylinder 1210 is further provided with at least one connection hole 1218, which is used to cooperate with the receiving assembly of the conveying device to connect the first connecting part 1200 and the receiving assembly of the conveying device (described in detail below). As shown in the figure, in this embodiment, the cylinder 1210 is provided with two connection holes 1218, and the two connection holes 1218 are radially opposite.

[0067] refer to FIG. 4A to FIG. 4C In this embodiment, the first connecting part 1200 also includes a first elastic piece 1230 connected to the cylinder 1210 (the figure shows a first elastic piece 1230, and in other embodiments, multiple first elastic pieces 1230 can also be provided). The first elastic piece 1230 is located between the two connecting holes 1218 in the circumferential direction. The first elastic piece 1230 can automatically spring into the cavity 1211 of the cylinder 1210 by utilizing its own elasticity to cooperate with the second connecting part 1300. In order to ensure that the first connecting part 1200 has a certain elasticity and strength, the material of the first connecting part 1200 is preferably a metal material, such as stainless steel, nickel-titanium alloy or cobalt-chromium alloy. In actual operation, the second connecting part 1300 is as follows Figure 4CThe direction of the arrow shown enters the cavity 1211 of the cylinder 1210 from left to right until the first locking portion 1311a or the second locking portion 1311b (depending on the size requirement of the final ring) passes over the first spring piece 1230 in the axial direction. When the external force is removed, the first spring piece 1230 automatically bounces into the cavity 1211 of the cylinder 1210 to the corresponding locking groove 1312 by its own elasticity and engages with the first locking portion 1311a or the second locking portion 1311b (shown as the first locking portion 1311a), thereby connecting and locking the first connection portion 1200 and the second connection portion 1300 to prevent the first connection portion 1200 and the second connection portion 1300 from detaching.

[0068] Preferably, in order to improve the smoothness of the second connection part 1300 entering the cavity 1211 of the first connection part 1200, as Figure 4A As shown, the barrel 1210 is provided with a third opening 1219 which radially penetrates its side wall, and the third opening 1219 is communicated with the cavity 1211. The first elastic piece 1230 corresponds to the third opening 1219, one end of which is connected to the barrel 1210, and the other end is a free end, and the first elastic piece 1230 is provided with a limiting hole 1231 for cooperating with a receiving assembly (described in detail below) of a delivery device for delivering the cardiac implant 1000. Thus, when the second connecting portion 1300 enters the cavity 1211 of the first connecting portion 1200, an external force can be first used to make the first elastic sheet 1230 expand radially outward through the third opening 1219, so as to allow the receiving component of the conveying device to cooperate with the limiting hole 1231 and prevent the first elastic sheet 1230 from rebounding into the cavity 1211 of the first connecting portion 1200. Therefore, the second connecting portion 1300 is free from being blocked by the first elastic sheet 1230, and the second connecting portion 1300 can freely pass through the entire cavity 1211 until the first locking portion 1311a or the second locking portion 1311b axially passes over the first elastic sheet 1230, and then the connection between the receiving component of the conveying device and the first elastic sheet 1230 is released, and the first elastic sheet 1230 automatically rebounds into the cavity 1211 to the corresponding locking groove 1312 by its own elasticity and engages with the first locking portion 1311a or the second locking portion 1311b (such as Figure 4C shown).

[0069] like Figure 4D As shown, in this embodiment, in order to allow the first elastic piece 1230 to expand radially outward, the inner diameter of the second coating film 1420 is larger than the outer diameter of the cylinder 1210, so that a space 1421 is reserved between the second coating film 1420 and the cylinder 1210 to allow the first elastic piece 1230 to expand radially outward. Figure 4EAs shown, in other embodiments, the second coating film 1420e may also be closely attached to the outer surface of the cylinder 1210, and a window 1422 is opened in the second coating film 1420 corresponding to the third opening 1219, which can also allow the first elastic sheet 1230 to expand radially outward.

[0070] refer to Figure 4F In other embodiments, in order to facilitate the second connection part 1300 to enter the cylinder 1210f, the first connection part 1200f further includes an outward expansion section 1240 connected to the second end 1213f of the cylinder 1210f, for guiding the second connection part to enter the cylinder 1210f. Figure 4F As shown, the outward expansion section 1240 is generally trumpet-shaped and includes a plurality of guide pieces 1241 spaced apart along the circumferential direction. Each guide piece 1241 gradually moves away from the second end 1213f of the cylinder 1210f in the axial direction and gradually expands outward in the radial direction. Preferably, a fixing hole 1242 is also provided at the end of each guide piece 1241 for fixing the second coating film (not shown in the figure) covering the first connecting portion 1200f, for example, by bonding, sewing, etc.

[0071] It is understandable that in other embodiments, the first connecting portion 1200 may also adopt other structures. Figure 4G As shown, the connection hole 1218g provided on the cylinder 1210g of the first connection portion 1200g is aligned with the limiting hole 1231g on the first elastic piece 1230g in the axial direction. Figure 4H As shown, in this example, the barrel 1210h of the first connecting portion 1200h is shorter than the aforementioned barrel 1210, and the first elastic piece 1230h is arranged at the second end 1213h of the barrel 1210h, and the third opening 1219 is no longer arranged. In addition, the barrel 1210h of this example is no longer provided with a connecting hole 1218, but the limiting hole 1231h on the first elastic piece 1230h is also used as a connecting hole connected to the receiving assembly of the conveying device. Further, three first elastic pieces 1230h are arranged on the second end 1213h of the barrel 1210h in this example, and the first elastic pieces 1230h are evenly spaced and distributed along the circumferential direction.

[0072] refer to Figure 5A An embodiment of the present invention provides a delivery device 2000 for delivering the cardiac implant 1000. The delivery device 2000 includes a delivery sheath assembly 2100, a receiving assembly 2200, and a capture assembly 2300 movably disposed in the delivery sheath assembly 2100.

[0073] refer to Figure 5A and Figure 5BThe delivery sheath assembly 2100 includes a delivery sheath 2110 and a first operating handle 2120 connected to the proximal end of the delivery sheath 2110. Preferably, a bulge 2111 is provided on the outer side of the tube wall of the delivery sheath 2110 near its distal end, and a guide hole is provided in the bulge 2111 that penetrates the bulge 2111 along the axial direction, which is used to pass a guide wire and be guided by the guide wire, and the guide hole and the first channel 1104 formed by the aforementioned main body 1100 and the second connecting part 1300 can be movably passed by the guide wire.

[0074] The receiving assembly 2200 includes at least one second elastic piece 2210, at least one locking wire 2220, and a second operating handle 2230 connected to the at least one locking wire 2220. Figure 5B As shown, in this embodiment, the receiving assembly 2200 includes two second elastic pieces 2210, and the two second elastic pieces 2210 are fixedly connected to the distal end of the delivery sheath tube 2110. The second elastic piece 2210 is provided with a locking hole 2211. Figure 5C and Figure 5D As shown, in this embodiment, the receiving assembly 2200 includes three locking wires 2220, two of which are used to cooperate with the locking holes 2211 on the two second elastic pieces 2210 respectively, and the other locking wire 2220 is used to cooperate with the limiting hole 1231 of the first elastic piece 1230 on the first connecting portion 1200 of the cardiac implant 1000 (described in detail below). Correspondingly, three axial through cavities 2112 are provided in the wall of the delivery sheath 2110, and a locking wire 2220 is movably arranged in a corresponding axial through cavity 2112. Figures 5B to 5D As shown, in the present embodiment, each of the locking wires 2220 is constructed of a single wire and is used to be plugged in and matched with the corresponding limiting hole 1231 or locking hole 2211. The material of the locking wire 2220 may be a metal material or a non-metal material, preferably stainless steel, nickel titanium, cobalt-chromium alloy, polyetheretherketone (PEEK), polyethylene (PE) and the like. During assembly, the first spring piece 1230 or the second spring piece 2210 is radially expanded outward by an external force, and then the corresponding locking wire 2220 is inserted into the limiting hole 1231 or the locking hole 2211 to maintain the radially expanded shape of the first spring piece 1230 or the second spring piece 2210 (such as Figure 5C By pulling the corresponding locking wire 2220 toward the proximal side, the lock wire 2220 can be released from the corresponding limiting hole 1231 or locking hole 2211, and the first elastic piece 1230 or the second elastic piece 2210 will automatically rebound radially inward (as shown in FIG. Figure 5D shown).

[0075] It is understandable that in other embodiments, the lock wire 2220 may also adopt other structures. Figure 5E-5GAs shown, the locking wire 2220a adopts a U-shaped double-wire structure, one locking wire 2220a is movably arranged in a corresponding axial through cavity 2112, and each locking wire 2220a is correspondingly arranged with a corresponding limiting hole 1231 or a locking hole 2211 (such as Fig. 5F As shown in FIG. 2 , both ends of each locking wire 2220a extend to the proximal end and are connected to the second operating handle 2230. During operation, the first elastic sheet 1230 of the first connecting member 1200 or the second elastic sheet 2210 can be pulled radially outward (as shown in FIG. 2 ) by operating the second operating handle 2230 to pull both ends of the locking wire 2220a. Fig. 5F By pulling one end of the corresponding locking wire 2220a toward the proximal side until the other end of the locking wire 2220a exits from the limiting hole 1231 or the locking hole 2211, the first elastic sheet 1230 or the second elastic sheet 2210 automatically rebounds radially inward (as shown in FIG. Figure 5G shown).

[0076] Alternatively, in other embodiments, the receiving assembly 2200b may further include a cutting tube 2240 (eg, Figure 5H As shown). The cutting tube 2240 includes a plurality of cutting grooves 2241, each of which extends in the circumferential direction, and the plurality of cutting grooves 2241 are arranged at intervals in the axial direction. Preferably, adjacent cutting grooves 2241 are staggered from each other in the circumferential direction to improve the bending performance of the cutting tube 2240 in all directions. The material of the cutting groove 2241 can be a metal material or a non-metal material, preferably stainless steel, nickel titanium, PEEK, PE, polyimide (PI), block polyether amide (Pebax), polytetrafluoroethylene (PTFE), nylon and the like. At least one locking wire 2220b is fixedly connected to the distal end of the cutting tube 2240, for example, by welding, bonding, melting, crimping, etc. In addition, since the cutting tube 2240 is arranged in the delivery sheath 2110, and the locking wire 2220b needs to be inserted into the locking hole 2211 from the outside of the second elastic piece 2210, an obliquely extending through hole can be opened in the wall of the delivery sheath 2110 for passing the locking wire 2220b, so as to allow the locking wire 2220b to extend from the delivery sheath 2110 to the outside of the second elastic piece 2210. This example is particularly suitable for the case where the delivery device needs to pass through a curved path (such as the aortic arch) during delivery. Since the cutting tube 2240 can use its cutting groove 2241 to adaptively extend when bending, it can compensate for the loss of the locking wire length caused by bending, thereby effectively preventing the locking wire 2220b from retreating when encountering a curved path, thereby effectively eliminating the risk of the locking wire 2220b being unlocked in advance during delivery.

[0077] refer to Figure 5A and Figures 5I-5JIn this embodiment, the capture assembly 2300 includes a capture catheter 2310, a third operating handle 2320 connected to the proximal end of the capture catheter 2310, a capture rod 2330 movably inserted into the capture catheter 2310 and the third operating handle 2320, and a capturer 2340 and a fourth operating handle 2350 respectively connected to the distal end and proximal end of the capture rod 2330. The capture catheter 2310 can movably penetrate the delivery sheath assembly 2100. In this embodiment, the capturer 2340 includes a plurality of capture rings 2341, the proximal end of each capture ring 2341 is retracted and connected to the distal end of the capture rod 2330 through a connector 2342. In practice, the operator can hold the third operating handle 2320 with one hand and push the fourth operating handle 2350 with the other hand to expose the capturer 2340 to the distal end of the capture catheter 2310, and each capture ring 2341 is self-expanding (such as Fig.5I Alternatively, the operator can hold the third operating handle 2320 with one hand and pull the fourth operating handle 2350 with the other hand to retract the capture device 2340 into the capture catheter 2310 (as shown); Figure 5J shown).

[0078] refer to Figures 6A-6C The implant system 3000 of one embodiment of the present invention comprises the cardiac implant 1000 and the delivery device 2000 for delivering the cardiac implant 1000. During assembly, the delivery device 2000 and the cardiac implant 1000 can be connected by detachably connecting the receiving component 2200 of the delivery device 2000 with the first connecting portion 1200 of the cardiac implant 1000. Specifically, the second elastic piece 2210 of the receiving component 2200 is inserted into the connecting hole 1218 from the inner side of the corresponding connecting hole 1218 of the first connecting portion 1200, and the free end of the second elastic piece 2210 is located outside the connecting hole 1218, and then the corresponding locking wire 2220 is pushed distally from the outer side of the second elastic piece 2210 to be inserted into the locking hole 2211, thereby locking and connecting the receiving component 2200 and the first connecting portion 1200, and the first elastic piece 1230 is radially expanded outward to the outside of the third opening 1219, and then the corresponding locking wire 2220 is pushed distally from the inner side of the limiting hole 1231 to be inserted into the limiting hole 1231, thereby maintaining the radially expanded shape of the first elastic piece 1230 (such as Fig. 6AAs shown), the first elastic piece 1230 is prevented from bouncing inwardly into the cavity 1211 of the first connecting part 1200. It is worth noting that in the embodiment of the present invention, the corresponding locking wire 2220 for connecting the delivery device 2000 and the cardiac implant 1000 and for maintaining the radially outward expansion of the first elastic piece 1230 are both located outside the wall of the cylinder 1210 of the first connecting part 1200, avoiding occupying the space inside the cavity 1211, improving the passability inside the cavity 1211, and the capture catheter 2310 and the second connecting part 1300 can move smoothly in the cavity 1211 of the first connecting part 1200.

[0079] When the cardiac implant 1000 is pushed forward so that the second connection part 1300 enters the cavity 1211 of the first connection part 1200, the corresponding locking wire 2220 can be pulled proximally to release the connection between the locking wire 2220 and the first elastic sheet 1230, and the first elastic sheet 1230 automatically springs inward into the cavity 1211 of the first connection part 1200 to the corresponding locking groove 1312 and engages with the corresponding locking part 1311, thus completing the locking connection between the first connection part 1200 and the second connection part 1300 (e.g., Figure 6B Next, the remaining two lock wires 2220 are pulled proximally to release the connection between the two lock wires 2220 and the two second elastic sheets 2210, and then the receiving assembly 2200 is withdrawn as a whole, that is, the connection between the receiving assembly 2200 and the first connecting portion 1200 is released (as shown in FIG. Figure 6C At this time, the free end of the second elastic piece 2210 automatically moves toward the axis of the delivery sheath tube 2110 .

[0080] It is understandable that the implant system of the embodiment of the present invention may also include the cardiac implants of other embodiments and the corresponding delivery devices. Figure 6D-6E As shown, the implant system 3000g includes the use of the previously described Figure 4GAs described above, since the connection hole 1218g of the first connection part 1200g is aligned with the limiting hole 1231g on the first elastic sheet 1230g in the axial direction, the receiving assembly 2200g of the delivery device 2000g of this embodiment can only include one locking wire 2220 and one second elastic sheet 2210. During assembly, the second spring piece 2210 is inserted into the connecting hole 1218g from the inner side of the connecting hole 1218g, and the free end of the second spring piece 2210 is located outside the connecting hole 1218g, and the first spring piece 1230g is radially expanded outward to the outside of the third opening 1219g, and then the lock wire 2220 is pushed distally to be inserted into the lock hole 2211 from the outer side of the second spring piece 2210, and is inserted into the limiting hole 1231g from the inner side of the limiting hole 1231g, thereby locking the connection receiving component 2200g and the first connecting portion 1200g, while also maintaining the radially expanded shape of the first spring piece 1230g (such as Fig.6D When the cardiac implant 1000g is pushed forward so that the second connection part 1300g enters the cavity 1211g of the first connection part 1200g, the lock wire 2220 can be pulled proximally to simultaneously release the connection between the lock wire 2220 and the first elastic piece 1230g and the second elastic piece 2210. At this time, the first elastic piece 1230g automatically springs inward into the cavity 1211g of the first connection part 1200g and engages with the corresponding locking part, completing the locking connection between the first connection part 1200g and the second connection part 1300g, and also releasing the connection between the receiving component 2200g and the first connection part 1200g (as shown in FIG. 1 ). Fig. 6E The operation process is further simplified.

[0081] Or, if Figure 6F-6G As shown, the implant system 3000h may also include the use of Figure 4H The cardiac implant 1000h and the delivery device 2000 of the first connecting portion 1200h described in the drawings are as follows. As mentioned above, the first connecting portion 1200h is no longer designed with a connecting hole 1218, and the limiting hole 1231h on the first elastic sheet 1230h is used as a connecting hole at the same time. Therefore, during assembly, it is only necessary to insert the second elastic sheet 2210 into the limiting hole 1231h from the inner side of the corresponding first elastic sheet 1230h, and make the free end of the second elastic sheet 2210 be located outside the first elastic sheet 1230h, and then push the locking wire 2220 to the distal side and insert it into the locking hole 2211 from the outer side of the second elastic sheet 2210, so as to realize the locking connection between the receiving assembly 2200 and the first connecting portion 1200h, while also maintaining the radially outward expansion shape of the first elastic sheet 1230h (such as Fig. 6FWhen the cardiac implant 1000h is pushed forward so that the second connection part 1300h enters the cavity 1211h of the first connection part 1200h, the lock wire 2220 can be pulled proximally to release the connection between the lock wire 2220 and the second elastic sheet 2210, and then the receiving assembly 2200 is withdrawn as a whole. At this time, the first elastic sheet 1230h automatically springs inward to engage with the locking part 1311h, thus completing the locking connection between the first connection part 1200h and the second connection part 1300h, and also releasing the connection between the receiving assembly 2200 and the first connection part 1200h (as shown in FIG. 1 ). Figure 6G The operation process is effectively simplified.

[0082] refer to 7A to 7D When the cardiac implant 1000 is implanted, a conventional guidewire insertion operation is first performed, the distal end of the guidewire 1 is wrapped around the cardiac tissue 2, and the proximal end of the guidewire 1 is left outside the body (e.g. Fig. 7A As shown); then, the delivery device 2000 and the cardiac implant 1000 are assembled together by the method described above (at this time, the main body 1100 of the cardiac implant 1000 is in a straight structure, and the first connecting portion 1200 is in a first structure), and the proximal end of the guide wire 1 left outside the body is sequentially inserted into the first channel 1104 formed by the second connecting portion 1300 and the main body 1100 of the cardiac implant 1000 and the guide hole in the bulging portion 2111 of the delivery sheath 2110; next, the cardiac implant 1000 and the delivery device 2000 are pushed into the body as a whole along the guide wire 1; when the distal end of the delivery device 2000 is close to the distal end of the guide wire 1, the distal end of the capture assembly 2300 is operated to pass through the first connecting portion 1200, and the capture device 2340 captures the distal end of the guide wire 1 (as shown in FIG. Figure 7B As shown), the catcher 2340 is then withdrawn to drive the distal end of the guide wire 1 into the cavity of the first connection part 1200. At the same time or later, the delivery sheath assembly 2100 and the receiving assembly 2200 of the delivery device 2000 are continuously pushed along the guide wire 1 to push the cardiac implant 1000, so that the cardiac implant 1000 surrounds the entire cardiac tissue 2 along the guide wire 1, and under the guidance of the guide wire 1, the second connection part 1300 enters the first connection part 1200 and the locking part 1311 axially passes over the first elastic sheet 1230; then the receiving assembly 2200 is operated to withdraw one of the locking wires 2220, and the first elastic sheet 1230 is no longer restricted by the locking wire 2220 and automatically bounces inward into the cavity 1211 of the first connection part 1200 and abuts against the locking part 1311, thereby realizing the locking of the first connection part 1200 and the second connection part 1300 (as shown). Figure 7CAs shown in FIG. 2 ), the cardiac implant 1000 is looped; next, the receiving assembly 2200 is operated to withdraw the remaining locking wires 2220 to release the restriction of the locking wires 2220 on the second elastic sheet 2210, thereby unlocking and separating the cardiac implant 1000 from the delivery device 2000; then the capture assembly 2300 is operated to allow the capturer 2340 to release the distal end of the guide wire 1 (as shown in FIG. 2 ). Fig.7D As shown); finally, the guide wire 1 and the delivery device 2000 are withdrawn from the body as a whole, leaving the looped cardiac implant 1000 in the body. It is understandable that in other embodiments, similar methods can also be used to operate the aforementioned implant system 3000g and implant system 3000h, which will not be described in detail here. It is worth noting that when the aforementioned cardiac implant 1000 is implanted, the distal end of the guide wire 1 is in the body and the proximal end is outside the body, and a conventional guide wire can meet the use requirements without the need to use a special extended guide wire.

[0083] Compared with the prior art, the cardiac implant 1000 of the embodiment of the present invention can be looped directly and only by being pushed by the delivery device 2000, without the need for additional equipment to pull at the distal end, which effectively reduces the difficulty of looping and makes the operation easier.

[0084] refer to FIG. 8A to FIG. 8C As shown, the cardiac implant 1000 according to the embodiment of the present invention can be applied to three different cardiac surgeries. Fig. 8A As shown, the heart implant 1000 is applied to valve replacement. Specifically, the heart implant 1000 can be placed around the leaflets of the mitral valve and / or the adjacent leaflets of the chordae tendineae to form a ring through the path of femoral artery-aortic arch-aortic valve orifice-left ventricle according to the implantation method of the heart implant 1000, and then the artificial heart valve 3 is released in the ring formed by the heart implant 1000. The artificial heart valve 3 is anchored and limited by the ringed heart implant 1000.

[0085] Or Figure 8B As shown, the cardiac implant 1000 is used for chordal regulation. Specifically, the cardiac implant 1000 can be placed around the middle of the chords of the mitral valve to form a loop through the femoral artery-aortic arch-aortic valve orifice-left ventricle according to the above-mentioned cardiac implant 1000 implantation method, and the tightness of the chords can be regulated by controlling the diameter of the cardiac implant 1000 after the loop, thereby treating diseases such as mitral regurgitation caused by the length of the chords.

[0086] Or Figure 8CAs shown, the cardiac implant 1000 is used for papillary muscle tightening and regulation. Specifically, the cardiac implant 1000 can be placed around the outer sides of multiple papillary muscles of the mitral valve to form a ring through the path of femoral artery-aortic arch-aortic valve orifice-left ventricle according to the above-mentioned implantation method of the cardiac implant 1000, so as to bind each papillary muscle to be close to each other, reduce the volume of the left ventricle, and treat symptoms such as heart failure.

[0087] It is understandable that the cardiac implants of other embodiments may also be applied to the above three cardiac surgeries, which will not be described in detail here.

[0088] It can be understood that for mitral valve replacement or repair, the interventional pathway may also be, but is not limited to, via the femoral vein-inferior vena cava-right atrium-left atrium-left ventricle; and each embodiment may also perform tricuspid valve replacement or repair by selecting a suitable interventional pathway.

[0089] The above description is only a preferred specific implementation manner of the present invention, and the protection scope of the present invention is not limited to the embodiments listed above. Any simple change or equivalent replacement of the technical solution that can be obviously obtained by any technician familiar with the technical field within the technical scope disclosed in the present invention falls within the protection scope of the present invention.

Claims

1. A cardiac implant, characterized in that: The cardiac implant is configured to be advanced along a guidewire having an annular or substantially annular distal end, and includes a main body, a first connecting portion, and a second connecting portion. The main body includes a straight structure and a curved structure, and the main body includes a first end and a second end opposite to each other in the axial direction, the first connecting portion is connected to the first end of the main body, and the second connecting portion is connected to the second end of the main body. During the advancement process, the main body is transformed from the straight structure to the curved structure, and various parts of the main body are capable of transmitting axial force and movement to avoid axial stacking. The second connecting portion and the first connecting portion can be connected and locked to each other, thereby forming a ring together with the main body in the curved structure.

2. The cardiac implant according to claim 1, characterized in that The first connecting portion and the first end of the main body portion are capable of moving relative to each other, and the first connecting portion includes a first structure adjacent to the first end of the main body portion and located on one side of the main body portion, and a second structure extending axially from the first end of the main body portion, wherein when the main body portion is transformed from the straight structure to the curved structure, the first connecting portion is transformed from the first structure to the second structure.

3. The cardiac implant according to claim 1, characterized in that The main body portion includes a strip structure and / or a tubular structure, wherein the tubular structure includes a plurality of cutting grooves; and the strip structure and / or the tubular structure has at least one ridge extending continuously in the axial direction between the first end and the second end of the main body portion; during the process of the main body portion transforming from the straight structure to the curved structure, the physical length of the ridge remains unchanged.

4. The cardiac implant according to claim 1, characterized in that The material of the main body is selected from one or more of the following groups: nickel-titanium alloy, stainless steel, cobalt-chromium alloy, polytetrafluoroethylene, polyetheretherketone, polyethylene and nylon.

5. The cardiac implant according to claim 1, characterized in that The first connecting part includes a cylinder and at least one first elastic piece connected to the cylinder, and the second connecting part includes at least one locking part, at least one of which can enter the cylinder and engage with the first elastic piece, thereby locking the first connecting part and the second connecting part.

6. The cardiac implant according to claim 5, characterized in that The first elastic sheet is provided with a limiting hole, and the limiting hole cooperates with a receiving component of a conveying device for conveying the cardiac implant to keep the first elastic sheet radially expanding outward.

7. The cardiac implant according to claim 6, characterized in that The cylinder of the first connecting part has a cavity axially penetrating itself and an opening radially penetrating its side wall, and the first spring piece is arranged corresponding to the opening of the cylinder, wherein in the natural state of the first spring piece, the free end of the first spring piece extends into the cavity of the cylinder, and the free end of the first spring piece can expand radially outward through the opening under the action of external force, so that the receiving component cooperates with the limiting hole.

8. The cardiac implant according to claim 6, characterized in that The cylinder is also provided with at least one connecting hole for cooperating with the receiving assembly of the conveying device to connect the first connecting portion and the receiving assembly.

9. The cardiac implant according to claim 8, characterized in that The connecting hole is axially aligned with the limiting hole on the first elastic sheet.

10. The cardiac implant according to claim 5, characterized in that The cylinder of the first connecting part is also provided with a connecting position for being movably connected to the first end of the main body via one or more intermediate connecting elements.

11. The cardiac implant according to claim 10, characterized in that The first end of the main body is provided with two adjacent first through holes, the connecting position includes two adjacent second through holes arranged along the circumference of the cylinder, and one first through hole is movably connected to one second through hole via the intermediate connecting element.

12. The cardiac implant according to claim 5, characterized in that The first connection part further includes an outward expansion section connected to one end of the cylinder, and is used to guide the second connection part to be connected to the first connection part.

13. The cardiac implant according to claim 1, characterized in that The cardiac implant further includes a covering film covering at least a portion of the main body portion, the first connecting portion, and the second connecting portion.

14. An implant system, characterized in that: It comprises a cardiac implant according to any one of claims 1 to 13 and a delivery device for delivering the cardiac implant, the delivery device comprising a delivery sheath, a receiving assembly and a capture assembly movably arranged in the inner cavity of the delivery sheath for capturing a guide wire, the receiving assembly being detachably connected to the first connecting portion of the cardiac implant.

15. The implant system according to claim 14, characterized in that The receiving assembly includes at least one second spring piece and at least one locking wire. The second spring piece is fixedly connected to the distal end of the delivery sheath. The second spring piece can pass through the connecting hole or the limiting hole on the first connecting part and expand radially outward under the action of external force. The second spring piece is provided with a locking hole, and the locking wire is used to cooperate with the limiting hole and / or the locking hole.

16. The implant system according to claim 15, characterized in that At least one axial through cavity is arranged in the wall of the delivery sheath tube, and one of the locking wires is movably arranged in the axial through cavity.

17. The implant system according to claim 15, characterized in that The receiving assembly also includes a cutting tube movably inserted into the inner cavity of the delivery sheath tube, the cutting tube includes a plurality of circumferential cutting grooves, and the at least one locking wire is fixedly connected to the distal end of the cutting tube.

18. The implant system according to claim 15, characterized in that The locking wire is of a single-wire structure and is used for plugging and matching with the limiting hole and / or the locking hole.

19. The implant system according to claim 15, characterized in that The locking wire adopts a U-shaped double-wire structure passing through the limiting hole and / or the locking hole, and is used to pull the first elastic piece or the second elastic piece of the first connecting member to expand radially outward.

20. The implant system according to claim 14, characterized in that The tube wall of the delivery sheath is provided with a bulging portion, and the bulging portion is provided with a guide hole for guiding a guide wire. The main body of the cardiac implant and the second connecting portion together form a guide wire channel, and the guide hole and the guide wire channel are for the guide wire to pass through.

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