Valve loading device of heart replacement system

Abstract

The invention discloses a heart replacement system valve loading device which comprises a loading tube with a near end and a far end, and at least one pressing cavity formed at the near end of the tube wall of the loading tube; the pressing block is embedded in the pressing cavity of the loading tube, and the pressing block controls and changes the inner diameter of the near end of the loading tube. The pressing block is arranged in the loading tube, the loading channel with the inner diameter larger than that of the original tube of the loading tube is formed in the near end of the tube wall of the loading tube, a replacement valve can conveniently enter the loading tube, the replacement valve extrudes the pressing block after entering the loading channel from the near end of the loading tube, the inner surface of the pressing block is gradually aligned with the tube inner wall of the loading tube in a smooth transition mode, and the replacement valve is replaced. And further moving towards the inside of the loading pipe can be realized. Therefore, the replacement valve is extruded, and the extruded replacement valve is guided into the interventional catheter from the far end of the loading tube.

Description

Technical Field

[0001] The invention belongs to the technical field of medical devices, and in particular relates to a valve loading device for a heart replacement system. Background Art

[0002] Transcatheter aortic valve implantation (TAVI) is the third mode after surgical aortic valve replacement and drug treatment. It is a minimally invasive technology using cardiac catheters, which has the characteristics of no need for thoracotomy, less trauma, short operation time, and quick patient recovery. Before TAVI, the replacement valve needs to be loaded into the interventional catheter.

[0003] Currently, a crimping mechanism is required to crimp the replacement valve before it is loaded into an interventional catheter. However, the types of replacement valves vary, and not all replacement valves are suitable for crimping using a crimping mechanism. For example, mitral or tricuspid replacement valves are mostly double-layer structures, are long and easy to expand, and have a large crimping diameter, making it difficult to load the valve. Summary of the invention

[0004] The present invention aims to provide a valve loading device for a heart replacement system in order to solve the technical problems in the prior art that some replacement valves are long and easy to expand, have a large compression and grip diameter, and are difficult to load.

[0005] The heart replacement system valve loading device of the present invention comprises:

[0006] A loading tube having a proximal end and a distal end, and at least one pressing cavity formed at the proximal end of the tube wall of the loading tube;

[0007] At least one pressing block is embedded in the pressing cavity of the loading tube, and the pressing block controls and changes the inner diameter of the proximal end of the loading tube.

[0008] Preferably, the inner surface of the pressing block and the inner wall of the loading tube form an extrusion molding channel, and when the pressing block is located away from the inside of the loading tube, the maximum diameter of the extrusion molding channel is greater than the diameter of the far end of the loading tube, and when the pressing block is located close to the inside of the loading tube, the minimum diameter of the extrusion molding channel is smaller than the diameter of the far end of the loading tube.

[0009] Preferably, the pressing cavity comprises a cavity body and a handle cavity which is radially perpendicular and connected to the cavity body;

[0010] The pressing block comprises a block body and a handle connected to the block body, the block body is located in the cavity body, the handle is arranged in the handle cavity, and the thickness of the block body is smaller than the thickness of the cavity body.

[0011] Preferably, both sides of the pressing cavity further include side wing cavities communicated with the cavity body;

[0012] Both sides of the pressing block also include side wings connected to the block body respectively, and the side wings are arranged in the side wing cavity of the pressing cavity.

[0013] Preferably, the side wing is disposed in a side wing cavity of the pressing cavity and can be elastically pressed against a cavity wall of the side wing cavity close to the handle.

[0014] Preferably, the pressing block further comprises:

[0015] At least one pair of springs, one end of the spring is connected against the side wing, and the other end of the spring is connected against the cavity wall of the side wing cavity.

[0016] Preferably, a spring hole is provided on the cavity wall of the wing cavity, and the other end of the spring abuts against the spring hole connected to the cavity wall of the wing cavity.

[0017] Preferably, a side of the block body of the pressing block close to the inside of the loading tube is further provided with an axially arranged protective sheet, and a compressible gap is formed between the protective sheet and the inner wall of the block body.

[0018] Preferably, the handle comprises:

[0019] A handle connecting portion, connected to the block body and disposed in the handle cavity of the pressing cavity;

[0020] The tentacle part is connected to the handle connecting part and is located outside the loading tube.

[0021] Preferably, the width of the tentacle portion is greater than the width of the handle cavity of the cavity body.

[0022] Preferably, there are n pressing cavities, and the n pressing cavities are evenly spaced and formed at the proximal end of the wall of the loading tube;

[0023] There are n pressing blocks, and the n pressing blocks are respectively arranged in corresponding pressing cavities, n is a natural number greater than 2, and preferably n is 2-3.

[0024] Preferably, the pre-shrink tube has a proximal end with a large inner diameter and a distal end with a small inner diameter, and the distal end of the pre-shrink tube is arranged at the proximal end of the loading tube.

[0025] Preferably, the inner wall of the preshrink tube has a guide groove arranged from the proximal end to the distal end, and the distal end of the guide groove has a groove end surface inclined toward the center of the axis.

[0026] Preferably, the distal end of the pre-shrink tube is pluggable and detachable and is arranged on the proximal end of the loading tube.

[0027] Preferably, the pre-shrink tube has:

[0028] A trumpet-shaped proximal section and a tubular distal section connected to the distal end of the trumpet-shaped proximal section.

[0029] The positive and progressive effects of the present invention are:

[0030] 1) The present invention provides a pressing block in the loading tube. When the pressing block is not pressed and is in a natural state, a loading channel with a larger inner diameter than the original inner diameter of the loading tube is formed in the proximal end of the tube wall of the loading tube, so that the replacement valve can enter the loading tube easily. After the replacement valve enters the loading channel from the proximal end of the loading tube, the pressing block is pressed, and the inner surface of the pressing block gradually smoothly transitions and aligns with the inner wall of the loading tube, and can also move further into the loading tube. Thus, the replacement valve is squeezed, and the squeezed replacement valve is introduced into the interventional catheter from the distal end of the loading tube.

[0031] 2) The present invention provides a handle on the pressing block, which is convenient for the operator to press the pressing block to squeeze the replacement valve; it is also convenient for the operator to pull the pressing block, thereby making it easier to load the replacement valve into the loading tube.

[0032] 3) The present invention arranges the side wings in the side wing cavity of the pressing cavity. When the pressing block is not in the pressing state, the spring presses the side wings of the pressing block against the cavity wall of the side wing cavity close to the handle side, so that the inner diameter of the loading channel is in the largest loading channel in a natural state, freeing both hands to perform the valve loading operation.

[0033] 4) The present invention provides an axially arranged protective sheet in the cavity body of the pressing cavity, and the protective sheet and the inner wall of the cavity body are spaced to form a compressible gap. During the pressing process, when the inner side of the pressing block exerts excessive force on the replacement valve, the protective sheet will collapse into the compressible gap to prevent excessive squeezing of the replacement valve, thereby avoiding damage to the replacement valve.

[0034] 5) The present invention provides a loading tube and a pre-shrinking tube, and allows the replacement valve to enter from the proximal end of the pre-shrinking tube with a large inner diameter for preliminary compression. After the preliminary compression, the replacement valve enters the loading tube from the distal end of the pre-shrinking tube with a small inner diameter, and is introduced into the interventional catheter through the loading tube, thereby completing the compression and loading process of the replacement valve. Compared with manually compressing the replacement valve and then loading the replacement valve into the interventional catheter, the present invention is convenient for loading and easy to operate.

[0035] 6) In order to make the pre-shrink tube adaptable to the replacement valve with barbs, a guide groove is set from the proximal end to the distal end on the inner wall of the pre-shrink tube, and the straightened barbs are placed in the guide groove. The guide groove plays a guiding role to further prevent the replacement valve from rotating in the pre-shrink tube and causing damage to the straightened barbs. A groove end surface inclined toward the center of the axis is provided at the distal end of the guide groove to facilitate the export of the barbs, and the barbs and the replacement valve are exported together at the distal end of the pre-shrink tube.

[0036] 7) The distal end of the pre-shrink tube is connected to the proximal end of the loading tube using plug-in buckles such as a convex ring and a concave ring, so that the pre-shrink tube and the loading tube are detachable, which is convenient for repair and replacement of related parts and prevents the replacement valve from rotating when entering the loading tube after compression, causing damage to the replacement valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1A It is a schematic diagram of the three-dimensional structure of the valve loading device of the heart replacement system of the present invention;

[0038] Figure 1B and 1C It is a schematic diagram of an explosion of a valve loading device of a heart replacement system of the present invention;

[0039] Figure 2A is a perspective view of a pre-shrink tube 20 of the present invention;

[0040] Figure 2B A working state diagram of the pre-shrink tube 20 of the present invention;

[0041] Figure 3A It is a schematic diagram of the three-dimensional structure of the loading tube 10 of the present invention;

[0042] Figure 3B It is a schematic diagram of an explosion of the loading tube 10 of the present invention;

[0043] Figure 3C is a front view of the loading tube 10 of the present invention;

[0044] Figure 4A It is a schematic diagram of the three-dimensional structure of the pressing block 12 invented by the present invention;

[0045] Figure 4B It is a partial enlarged view of the pressing block 12 of the present invention;

[0046] Figure 4C and 4D Two working state diagrams of the pressing block 12 of the present invention;

[0047] Figure 5A A schematic diagram of inserting an interventional catheter 50 for a replacement valve;

[0048] Figure 5B is a front view of the interventional catheter 50;

[0049] Figure 5C Schematic diagram of an interventional catheter 50 loaded with a replacement valve entering the delivery system. DETAILED DESCRIPTION

[0050] The following describes the embodiments of the present invention through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention.

[0051] It should be noted that the following embodiments and features therein may be combined with each other if there is no conflict.

[0052] In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features. Therefore, the definition of "first" and "second" features can explicitly or implicitly include one or more of the features. In the description of the present invention, "several" and "a number" mean two or more, unless otherwise clearly and specifically defined.

[0053] In the present invention, "distal end", "proximal end", "distal section" and "proximal section" are used as directional words, which are commonly used terms in the field of interventional medical devices, where "distal end" and "distal section" refer to the end or section away from the operator during the operation, and "proximal end" and "proximal section" refer to the end or section close to the operator during the operation. In this application, the loading device defines the end where the replacement valve first enters as the proximal end, that is, the end is regarded as the end or section close to the operator during the operation. Similarly, the opposite end is regarded as the distal end. "Axial" refers to the direction parallel to the line connecting the distal center and the proximal center of the medical device; "radial" refers to the direction perpendicular to the above-mentioned "axial".

[0054] like Figures 1A to 1C As shown, in this example, the valve loading device of the heart replacement system of the present invention includes two parts: a loading tube 10 and a pre-shrink tube 20. The loading tube 10 has a proximal end and a distal end, and the pre-shrink tube 20 has a proximal end with a large inner diameter and a distal end with a small inner diameter. The distal end of the pre-shrink tube 20 is arranged at the proximal end of the loading tube 10. The replacement valve enters from the proximal end of the pre-shrink tube 20 with a large inner diameter, and is pre-compressed to form a relatively round shape. After pre-compression, the replacement valve enters the loading tube 10 from the distal end with a small inner diameter of the pre-shrink tube 20, and is compressed again to a suitable size through the extrusion channel of the loading tube 10 before being loaded into the introduction interventional catheter 50 (such as Figures 5A to 5C As shown in FIG. 5 , a loading process is completed. Compared with manually compressing the replacement valve and inserting the replacement valve into the interventional catheter 50, the device is convenient to load and easy to operate.

[0055] like Figure 2A and 2BAs shown, in this example, the pre-shrink tube 20 is a tube for preliminarily compressing the replacement valve as the name implies, and is hollow inside. The shape can be a tube structure with a large proximal end and a small distal end, and the size of the replacement valve is gradually reduced from the proximal end to the distal end. One example is that the pre-shrink tube 20 has a trumpet-shaped proximal section and a tubular distal section, and the distal end of the trumpet-shaped proximal section is connected to the proximal end of the tubular distal section, and a better way is to connect them in an integral molding. The interiors of the trumpet-shaped proximal section and the tubular distal section are both cavity structures, so space for preliminarily compressing and loading the replacement valve can be provided. The inner walls of the trumpet-shaped proximal section and the tubular distal section of the pre-shrink tube 20 have a guide groove 21 integrally arranged from the proximal end to the distal end, that is, the proximal section of the guide groove 21 is on the inner wall of the trumpet-shaped proximal section, and the distal section of the guide groove 21 is on the inner wall of the tubular distal section, and the guide groove 21 is integrally molded from the proximal end to the distal end. The design of the guide groove 21 can make the pre-shrink tube 20 suitable for replacement valves with barbs. The straightened barbs are placed in the guide groove 21. The guide groove 21 plays a guiding role and can prevent the replacement valve from rotating in the pre-shrink tube 20 and causing damage to the straightened barbs. A groove end surface 211 inclined toward the axis center is provided at the distal end of the guide groove 21 to facilitate the barbs of the replacement valve to be guided out, and finally the barbs and the replacement valve are output together at the distal end of the pre-shrink tube 20 into the loading tube 10. In a further example, there can be a plurality of guide grooves 21, and the plurality of guide grooves 21 are arranged on the inner wall of the pre-shrink tube 20 at a certain distance evenly spaced in the circumferential direction. Preferably, the number of guide grooves 21 is determined according to the number of barbs of the replacement valve to be compressed, and is an integer multiple of the number of barbs of the replacement valve, but is at least not less than the number of barbs of the replacement valve. When the barbs of the replacement valve are not evenly distributed, the position of the guide grooves 21 can also be adjusted accordingly, the purpose of which is to control the compression path of the barbs to prevent damage to the replacement valve and its barbs.

[0056] In this example, the inner diameter of the distal end of the pre-shrink tube 20 is not less than the inner diameter of the proximal end of the loading tube 10. A better way is that the inner diameter of the distal end of the pre-shrink tube 20 is consistent with the inner diameter of the proximal end of the loading tube 10 to facilitate the connection between the two. The distal end of the pre-shrink tube 20 and the proximal end of the loading tube 10 can be connected together in various ways, such as direct docking connection, detachable connection such as plug-in buckle, etc. In one example, Figures 1A to 1CAs shown, the distal end of the pre-shrink tube 20 is pluggable and detachable and is arranged at the proximal end of the loading tube 10. For example, the valve loading device of the heart replacement system includes a first clamping member 30 and a second clamping member 40. The first clamping member 30 is arranged on the loading tube 10, and the second clamping member 40 is arranged on the pre-shrink tube 20, and the first clamping member 30 and the second clamping member 40 are engaged with each other. The distal end of the pre-shrink tube 20 is clamped to the proximal end of the loading tube using the first clamping member 30 and the second clamping member 40, so that the pre-shrink tube 20 and the loading tube 10 are detachable, which is convenient for replacing related components, and avoids the replacement valve from rotating when entering the loading tube 10 after compression, resulting in damage to the replacement valve. In one example, the first clamping member 30 on the proximal end of the loading tube 10 is a concave ring, and the second clamping member 40 on the distal end of the preshrink tube 20 is a convex ring, and the convex ring on the distal end of the preshrink tube 20 is embedded in the concave ring on the proximal end of the loading tube 10 for clamping, so that the preshrink tube 20 and the loading tube 10 are detachably connected together. In another example, the first clamping member 30 on the proximal end of the loading tube 10 is a convex ring, and the second clamping member 40 on the distal end of the preshrink tube 20 is a concave ring, and the convex ring on the proximal end of the loading tube 10 is embedded in the concave ring on the distal end of the preshrink tube 20 for clamping, so that the preshrink tube 20 and the loading tube 10 are detachably connected together.

[0057] The loading tube 10 is a hollow tube installed and connected to the distal end of the pre-shrink tube 20, and is used to further compress the pre-compressed replacement valve to a desired size, so as to facilitate its introduction into the interventional catheter 50 for delivery into the human heart. Of course, without the pre-shrink tube 20, it is also feasible to directly compress the replacement valve into place with the loading tube 10 in one step, and then introduce it into the interventional catheter 50. Figures 3A to 3CAs shown, in this example, the loading tube 10 is a hollow tube structure having a proximal end and a distal end. The loading tube 10 includes a pressing cavity 11 and a pressing block 12. There is at least one pressing cavity 11 formed at the proximal end of the tube wall of the loading tube 10; there is also at least one pressing block 12 correspondingly, and the pressing block 12 is embedded in the pressing cavity 11 of the loading tube 10. The pressing block 12 controls the change of the inner diameter of the proximal end of the loading tube 10, and the inner surface of the pressing block 12 and the inner wall of the loading tube 10 are surrounded to form a loading channel 13. When the pressing block 12 is located at a position far away from the inside of the loading tube 10, the maximum diameter of the extrusion molding channel is greater than the diameter of the distal end of the loading tube 10, which facilitates the replacement valve to enter the loading tube 10; when the pressing block 12 is located at a position close to the inside of the loading tube 10, the minimum diameter of the extrusion molding channel is less than the diameter of the distal end of the loading tube 10, and the replacement valve can be further squeezed to a degree smaller than the diameter of the distal end of the loading tube 10. After the replacement valve is loaded, the pressing block 12 is squeezed and moved toward the inside of the loading tube 10. The inner surface of the pressing block 12 and the inner wall of the loading tube 10 will form a smaller extrusion molding channel. At this time, the size of the replacement valve can be further reduced, and the position of the replacement valve relative to the loading tube will not change under the action of the pressing block, which is conducive to the installation of the replacement valve into the interventional catheter 50. A better example is that there are n pressing chambers 11 and correspondingly n pressing blocks 12, where n is a natural number greater than 2, for example, n is 2, that is, the loading tube 10 has two pressing chambers 11, and the two pressing chambers 11 are symmetrically arranged at the proximal end of the tube wall of the loading tube 10, that is, the two pressing chambers 11 are arranged at the proximal end of the loading tube 10 with an interval of 180°. Similarly, there are also two pressing blocks 12, and the two pressing blocks 12 are respectively arranged in the corresponding pressing chambers 11, so that the replacement valve can be extruded simultaneously from two symmetrical directions, and the inner surfaces of the two pressing blocks 12 and the inner wall of the loading tube 10 form a loading channel 13, forming an extrusion molding channel for further extruding the replacement valve. When n is 3, that is, the loading tube 10 has three pressing chambers 11, and the three pressing chambers 11 are arranged at the proximal end of the loading tube 10 at circumferential intervals of 120°. At this time, there are also three pressing blocks 12, and the three pressing blocks 12 are respectively arranged in the corresponding pressing chambers 11, so that the replacement valve is squeezed simultaneously from three directions at 120° intervals, and the inner surfaces of the three pressing blocks 12 and the inner wall of the loading tube 10 form a loading channel 13, thereby further squeezing the extrusion molding channel of the replacement valve. Of course, n can be 4, 5, or 6, which is also feasible, as long as the pressing chambers 11 and the pressing blocks 12 are evenly spaced and arranged on the proximal inner wall of the loading tube 10 to form a loading channel 13 and gradually squeeze to form an extrusion channel, which will not be elaborated here.In this example, the loading principle process is as follows: the inner surface of the pressing block 12 and the inner wall of the loading tube 10 are combined to form a loading channel 13. When the pressing block 12 is not pressed and is in a natural state, the pressing block 12 is attached to the cavity wall of the pressing cavity 11 farthest from the center of the loading channel 13, so that the inner diameter of the loading channel 13 is larger than the inner diameter of the loading tube 10, which is convenient for the replacement valve to enter the loading tube 10. After loading, the pressing block 12 is pressed by one hand, and the inner surface of the pressing block 12 cooperates with the inner wall of the loading tube 10 to form an extrusion molding channel. The pressing block 12 gradually squeezes the replacement valve to compress the radial size of the replacement valve, thereby achieving the extrusion of the replacement valve. Moreover, due to the further extrusion of the extrusion block 12, the position of the replacement valve and the extrusion block 12 will remain unchanged. At this time, the other hand operates the interventional catheter 50, and the extruded replacement valve is introduced into the interventional catheter 50 from the distal end of the loading tube 10.

[0058] In a preferred example, the inner surface of the pressing block 12 is a smooth arc, and during the pressing process, the smooth arc inner surface can gradually align with the inner wall of the loading tube 10, and can further move into the loading tube 10 to form a circular extrusion molding channel with an inner diameter smaller than the distal end of the loading tube 10. In another preferred example, the inner surface of the pressing block 12 is a rough surface, which increases friction, so that the replacement valve does not slide when being squeezed, avoiding valve damage.

[0059] like Figure 3CAs shown, in a further example, the pressing chamber 11 includes a chamber body 111 and a handle chamber 112. The handle chamber 112 is radially perpendicular to the chamber body 111 and communicates with the chamber body 111; the pressing block 12 includes a block body 121 and a handle 122, and the handle 122 is connected to the block body 121; the block body 121 is located in the chamber body 111, and the handle 122 is located in the handle chamber 112. During the loading process, the handle 122 is pulled to move the pressing block 12 away from the center of the loading channel 13, and the inner diameter of the loading channel 13 becomes larger, which is convenient for loading the replacement valve; after the loading is completed, the handle 122 is pressed to move the pressing block 12 toward the center of the loading channel 13, and the block body 121 of the pressing block 12 squeezes the replacement valve. At the same time, the squeezing force of the pressing block 12 will also fix the position of the replacement valve, so that the replacement valve cannot move relative to the loading tube 10. At this time, one end of the replacement valve extends out of the distal end of the loading tube 10, and the replacement valve is squeezed. Press the block 12 tightly to guide the replacement valve extending out of the distal end of the loading tube 10 into the interventional catheter 50, and then release the pressing block 12. At this time, the replacement valve can automatically expand to both sides due to the expansion force of the replacement valve. At this time, the pressing block 12 no longer fixes the replacement valve. At this time, pull the loading tube 10 away from the interventional catheter 50 for a certain distance, so that more replacement valves extend out of the distal end of the loading tube 10. Repeat the above action, pinch the pressing block 12 again, and guide the replacement valve extending out of the distal end of the loading tube 10 into the interventional catheter 50. Repeat several times until the replacement valve is loaded into the interventional catheter 50.

[0060] In a further example, the handle 122 includes a handle connection portion 1221 and a tentacle portion 1222. The handle connection portion 1221 is connected to the block body 121 and is disposed in the handle cavity 112, and the tentacle portion 1222 is connected to the handle connection portion 1221 and is located outside the loading tube 10. By pressing the tentacle portion 1222 outside the loading tube 10, the block body 121 squeezes the replacement valve in the loading channel 13. In a preferred example, the width of the tentacle portion 1222 is greater than the width of the handle cavity 112, so as to ensure that the pressing block 12 will not sink from the handle cavity 112 into the interior of the loading tube 10.

[0061] like Figures 3B to 3CAs shown, in this example, the two sides of the pressing cavity 11 also include wing cavities 113, one end of which is connected to the cavity body 111; the other end of the wing cavity 113 can penetrate the tube wall of the loading tube 10, thereby communicating with the outside world; the other end of the wing cavity 113 may not penetrate the tube wall of the loading tube 10, and is not connected to the outside world, which is also feasible. At this time, the two sides of the pressing block 12 also include wing 123, which is connected to the block body 121. The wing 123 is arranged in the wing cavity 113 of the pressing cavity 11. The cavity height of the wing cavity 113 can limit the range of movement of the wing 123 in the pressing direction, thereby limiting the pressing stroke range of the pressing block 12. The limiting principle of the pressing stroke range is as follows: first, the replacement valve is loaded, and the pressing block 12 is pulled in the direction away from the center of the loading channel 13. When the wing 123 moves in the wing cavity 113 to the cavity wall of the wing cavity 113 close to the handle 122 side, the inner diameter of the loading channel 13 reaches the maximum, which is convenient for loading the replacement valve. Then, the pressing block 12 is pressed again, and the wing 123 moves in the wing cavity 113 toward the center of the loading channel 13. When the wing 123 contacts the cavity wall of the wing cavity 113 away from the handle 122 side, the pressing block 12 is pressed to the maximum displacement, and the inner diameter of the loading channel 13 reaches the minimum, and it cannot be pressed further, so as to avoid damage to the replacement valve caused by excessive pressing. In a further example, the wing 123 is arranged in the wing cavity 113 of the pressing cavity 11 and can be elastically pressed against the cavity wall of the wing cavity 113 close to the handle 122 side. A specific example is that the pressing block 12 includes at least one pair of springs 124, one end of the spring 124 is abutted against the side wing 123, and the other end of the spring 124 is abutted against the cavity wall of the side wing cavity 113. When the pressing block 12 is not pressed and is in a natural state, the spring 124 presses the side wing 123 of the pressing block 12 against the cavity wall of the side wing cavity 113 close to the handle 122, so that the inner diameter of the loading channel 13 automatically reaches the maximum, and there is no need to manually pull the handle 122, so that the inner diameter of the loading channel 13 reaches the maximum. A more preferred solution is that a spring hole 114 is provided on the cavity wall of the side wing cavity 113, and the other end of the spring 124 abuts against the spring hole 114 on the cavity wall of the side wing cavity 113. The spring hole 114 accommodates a spring 124, so that the side wing 123 of the pressing block 12 can abut against the cavity wall of the side wing cavity 113 away from the handle 122 when the pressing block 12 is pressed, thereby achieving the maximum pressing degree. At the same time, the distal sides of the side wings 123, the connecting parts 1221, etc. of multiple pressing blocks 12 can abut against the proximal sides of the side wing cavity 113 and the handle cavity 112, and their positions are stable and uniform, which is convenient for operation.

[0062] like Figure 4AAs shown, in this example, a protective sheet 125 is provided on one side of the block body 121 of the pressing block 12 close to the axis of the loading channel 13. The protective sheet 125 is axially arranged in the loading channel 13. At this time, a compressible gap 126 is formed between the protective sheet 125 and the inner wall of the block body 121. Figures 4A to 4D As shown, during the pressing process, when the inner side of the pressing block 12 exerts too much force on the replacement valve, the protective sheet 125 will collapse into the compressible gap 126 to prevent excessive squeezing of the replacement valve, thereby avoiding damage to the replacement valve. In a preferred example, the protective sheet 125 is a smooth arc. During the pressing process, the smooth arc-shaped protective sheet 125 can gradually move toward the inner wall of the loading tube 10 to form an extrusion molding channel with a smaller inner diameter. In another preferred example, the protective sheet 125 has a rough surface. The rough surface of the protective sheet 125 increases the friction force, so that the replacement valve will not slide when squeezed, avoiding valve damage. In a more optimal solution, the thickness of the protective sheet 125 is T, where 0.5mm≤T≤1mm. The specific thickness of the protective sheet 125 can be calculated based on the strength of the material and the force generated by the safety limit.

[0063] In summary, the present invention provides a loading tube 10 and a pre-shrink tube 20, and allows the replacement valve to enter from the proximal end of the pre-shrink tube 20 with a large inner diameter for compression, and then enter the loading tube 10 from the distal end of the pre-shrink tube 20 with a small inner diameter after compression, and then be sent into the interventional catheter 50 through the loading tube 10, thereby completing the loading process. Compared with manually compressing the replacement valve by hand and then inserting the replacement valve into the interventional catheter 50, the present invention is convenient for loading and easy to operate.

[0064] The present invention is described in detail above in conjunction with the embodiments of the accompanying drawings. A person skilled in the art can make various variations of the present invention according to the above description. Therefore, some details in the embodiments should not be construed as limiting the present invention, and the present invention shall be protected by the scope defined by the attached claims.

Claims

1. A heart replacement system valve loading device, characterized in that The heart replacement system valve loading device comprises: A loading tube having a proximal end and a distal end, and at least one pressing cavity formed at the proximal end of the tube wall of the loading tube; At least one pressing block is embedded in the pressing cavity of the loading tube, and the pressing block controls and changes the inner diameter of the proximal end of the loading tube.

2. The heart replacement system valve loading device according to claim 1, characterized in that The inner surface of the pressing block and the inner wall of the loading tube form an extrusion molding channel. When the pressing block is located far away from the inside of the loading tube, the maximum diameter of the extrusion molding channel is greater than the diameter of the far end of the loading tube. When the pressing block is located close to the inside of the loading tube, the minimum diameter of the extrusion molding channel is smaller than the diameter of the far end of the loading tube.

3. The heart replacement system valve loading device according to claim 1, characterized in that The pressing cavity comprises a cavity body and a handle cavity which is radially perpendicular and connected to the cavity body; The pressing block comprises a block body and a handle connected to the block body, the block body is located in the cavity body, the handle is arranged in the handle cavity, and the thickness of the block body is smaller than the thickness of the cavity body.

4. The heart replacement system valve loading device according to claim 3, characterized in that Both sides of the pressing cavity also include side wing cavities communicated with the cavity body; Both sides of the pressing block also include side wings connected to the block body respectively, and the side wings are arranged in the side wing cavity of the pressing cavity.

5. The heart replacement system valve loading device according to claim 4, characterized in that The side wing is arranged in the side wing cavity of the pressing cavity and can be elastically pressed against the cavity wall of the side wing cavity close to the handle side.

6. The heart replacement system valve loading device according to claim 5, characterized in that The pressing block also includes: At least one pair of springs, one end of the spring is connected against the side wing, and the other end of the spring is connected against the cavity wall of the side wing cavity.

7. The heart replacement system valve loading device according to claim 6, characterized in that A spring hole is provided on the cavity wall of the wing cavity, and the other end of the spring abuts against and is connected to the spring hole on the cavity wall of the wing cavity.

8. The heart replacement system valve loading device according to any one of claims 1 to 3, characterized in that A side of the block body of the pressing block close to the inside of the loading tube is also provided with an axially arranged protective sheet, and a compressible gap is formed between the protective sheet and the inner wall of the block body.

9. The heart replacement system valve loading device according to claim 3, characterized in that The handle comprises: A handle connecting portion, connected to the block body and disposed in the handle cavity of the pressing cavity; The tentacle part is connected to the handle connecting part and is located outside the loading tube.

10. The heart replacement system valve loading device according to claim 9, characterized in that The width of the tentacle portion is greater than the width of the handle cavity of the cavity body.

11. The heart replacement system valve loading device according to any one of claims 1 to 10, characterized in that There are n pressing cavities, and the n pressing cavities are evenly spaced and formed at the proximal end of the wall of the loading tube; There are n pressing blocks, and the n pressing blocks are respectively arranged in corresponding pressing cavities, n is a natural number greater than 2, and preferably n is 2-3.

12. The heart replacement system valve loading device according to claim 8, characterized in that The inner surface of the pressing block and the protective sheet are both smooth arc-shaped.

13. The heart replacement system valve loading device according to any one of claims 1 to 12, characterized in that: Also includes The pre-shrink tube has a proximal end with a large inner diameter and a distal end with a small inner diameter, and the distal end of the pre-shrink tube is arranged at the proximal end of the loading tube.

14. The heart replacement system valve loading device according to claim 13, characterized in that The inner wall of the pre-shrink tube has a guide groove arranged from the proximal end to the distal end, and the distal end of the guide groove has a groove end surface inclined toward the center of the axis.

15. The heart replacement system valve loading device according to claim 13, characterized in that The distal end of the pre-shrink tube is pluggable and detachable and is arranged at the proximal end of the loading tube.

16. The heart replacement system valve loading device according to claim 13, characterized in that The pre-shrink tube has: A trumpet-shaped proximal section and a tubular distal section connected to the distal end of the trumpet-shaped proximal section.

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