Loading device

Abstract

The invention relates to a loading device which comprises a closing-in piece and a dragging assembly, the closing-in piece is provided with a first end, a second end and a hollow channel penetrating through the first end and the second end, the inner wall of the hollow channel is in smooth transition from the first end to the second end, and the diameter of the hollow channel at the second end is smaller than that of the hollow channel at the first end; the dragging assembly is used for capturing one end of the implant and dragging the implant into the hollow channel from the first end and out of the hollow channel from the second end, so that the hollow channel compresses the implant. According to the loading device disclosed by the invention, the traction force applied to the implant by the dragging assembly is utilized, so that the implant enters the hollow channel from the first end and is moved out from the second end, and the implant is uniformly compressed by utilizing the hollow channel, so that the implant has good uniformity and symmetry in the loading process.

Description

Technical Field

[0001] The present application relates to the technical field of medical devices, and in particular to a loading device. Background Art

[0002] The mitral valve has a larger circumference and shorter height than the aortic valve. The periphery of the mitral valve stent is usually designed in an anchoring shape to accommodate the needs of anchoring and radial shape changes. When the mitral valve stent is preloaded, an external force is usually applied to drive it to contract.

[0003] In the related art, when loading a mitral valve stent, a driving external force is usually applied to the mesh of the mitral valve stent, or radial pressure is directly applied to the outer periphery of the mitral valve stent to compress the mitral valve stent so that the compressed mitral valve stent can be subsequently loaded into the delivery device.

[0004] However, the two loading methods in the related art, the former will cause unnecessary pulling or pushing deformation, while the latter will have the risk of popping out the mitral valve stent or twisting deformation of the anchoring shape design. Whether it is pulling or pushing deformation, or popping out the mitral valve stent or twisting deformation of the anchoring shape design, it will affect the uniformity and symmetry of the mitral valve stent, resulting in easy failure when loading into the delivery device. Summary of the invention

[0005] Based on this, a loading device is provided to solve the problem of how to improve the uniformity and symmetry during the loading process.

[0006] The present application provides a loading device, comprising:

[0007] A closing piece, the closing piece having a first end and a second end and a hollow channel extending through the first end and the second end, the inner wall of the hollow channel smoothly transitioning from the first end to the second end, and a diameter of the hollow channel at the second end being smaller than a diameter of the hollow channel at the first end;

[0008] A dragging assembly is used to capture one end of the implant and to pull the implant from the first end into the hollow channel and out from the second end, so that the hollow channel compresses the implant.

[0009] In one embodiment, the dragging assembly includes a holding member, a limit cover and a plurality of clamping arms, wherein the limit cover is limited to the holding member in a radial direction thereof and can move axially relative to the holding member, and a plurality of clamping arms are arranged at axial intervals around the holding member, and when the limit cover moves axially toward the clamping arm relative to the holding member, the limit cover pushes the closing member to move axially along the holding member, so that the closing member squeezes the plurality of clamping arms and the implant radially inward.

[0010] In one embodiment, the limit cover has a limit space. When the limit cover moves to the limit position on the side where the clamping arm is located, one end of the clamping arm connected to the holding piece is accommodated in the limit space, so that the limit cover squeezes the clamping arm radially inward.

[0011] In one embodiment, the clamping arm is a slender structural member having a first end and a second end opposite to each other, the first end of the clamping arm is rotatably connected to the holding member, and the second end of the clamping arm is formed with a hook claw, and the hook claw is used to cooperate with the mating portion of the implant, so that when the clamping arm rotates radially inward relative to the holding member along the holding member, the hook claw pulls the mating portion toward the center line of the holding member.

[0012] In one of the embodiments, the end of the gripping member is coaxially connected to a limiting boss, and the clamping arms are rotatably connected to the limiting boss and are evenly arranged around the central axis of the limiting boss.

[0013] In one of the embodiments, the limiting boss is provided with a plurality of grooves arranged at equal intervals along the circumference, and one ends of the plurality of clamping arms are respectively and correspondingly arranged on the side walls of the grooves.

[0014] In one embodiment, the diameter of the limiting boss is greater than the diameter of the gripping member;

[0015] And / or, the edge contour of the limiting boss in the axial direction around the holding member is circular, and the diameter of the limiting boss is equal to the diameter of the hollow channel at the second end position.

[0016] In one embodiment, at least a portion of the gripping member is formed with a lumen, and a side wall corresponding to the lumen is provided with a gas avoidance groove; the loading device includes a moving member and a plurality of connecting rods, the plurality of connecting rods are passed through the gas avoidance groove, and the two ends of each connecting rod are respectively hinged to the moving member and the corresponding clamping arm, the moving member is disposed in the lumen, and can move in the lumen along the axial direction of the gripping member, so that the connecting rod drives the corresponding clamping arm to rotate relative to the gripping member.

[0017] In one of the embodiments, a driving member is further included, wherein the driving member is connected to the moving member, and the driving member is used to drive the moving member to move axially relative to the holding member.

[0018] In one embodiment, the end surface of the limit cover abuts against the end surface of the second end of the closing member, and when the end surface of the limit cover abuts against the end surface of the second end of the closing member, the limit cover limits the closing member coaxially to the holding member.

[0019] The loading device includes a closing member and a drag assembly, wherein the closing member has a first end and a second end and a hollow channel extending from the first end to the second end, wherein the inner wall of the hollow channel smoothly transitions from the first end to the second end, and the diameter of the hollow channel at the second end is smaller than the diameter of the hollow channel at the first end. The drag assembly applies a traction force to the implant, so that the implant enters the hollow channel from the first end and moves out from the second end. In this way, the hollow channel can uniformly compress the implant, so that the implant has good uniformity and symmetry during loading. At the same time, based on the smooth inner wall of the hollow channel, the implant can smoothly pass through the hollow channel and is not easily scratched. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, drawings of other embodiments can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 This is a schematic structural diagram of a loading device according to an embodiment of the present application, in which a dragging assembly pulls an implant from a first end of a closing member into a hollow channel.

[0022] Figure 2 This is a schematic structural diagram of a loading device according to one embodiment of the present application, in which a dragging assembly pulls an implant out of a hollow channel from the second end of a closing member.

[0023] Figure 3 It is a schematic structural diagram of a drag assembly of a loading device according to one embodiment, in which the clamping arm is in an open state.

[0024] Figure 4 It is a schematic structural diagram of a loading device in one embodiment when the clamping arm of the dragging assembly is folded.

[0025] Figure 5 It is a schematic structural diagram of a drag component of a loading device according to one embodiment when it captures one end of an implant.

[0026] Figure 6 This is a schematic structural diagram of a dragging assembly of a loading device according to one embodiment after the implant is moved out of a hollow channel.

[0027] Figure 7 It is a schematic structural diagram of a dragging assembly of a loading device according to another embodiment.

[0028] Figure 8 for Figure 7 A schematic diagram showing the structure of the drag assembly of the loading device when capturing one end of the implant.

[0029] Fig. 9 for Figure 7 The structure diagram shown is before the dragging assembly of the loading device drags the implant out of the hollow channel from the second end of the closing member.

[0030] Reference numerals:

[0031] 100, loading device; 10, closing member; 10a, first end; 10b, second end; 10c, hollow channel; 20, drag assembly; 21, holding member; 21a, tubular cavity; 21b, air avoidance groove; 22, limiting cover; 22a, through hole; 22b, limiting space; 23, clamping arm; 23a, hook claw; 24, limiting boss; 24a, groove; 24b, frustum; 25, moving member; 26, connecting rod; 200, implant; 200a, mating part. DETAILED DESCRIPTION

[0032] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0033] In the embodiments of the present application, 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 the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0034] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0035] It should be noted that "distal" and "proximal" are used as directional terms, which are commonly used terms in the field of interventional medical devices, where "distal" refers to the end away from the operator (such as the doctor) during the operation, and "proximal" refers to the end close to the operator during the operation. Axial refers to the direction in which the central axis of the medical device extends; radial refers to the direction perpendicular to the above-mentioned axial direction; circumferential refers to the direction around the above-mentioned axial direction.

[0036] See also Figure 1 and Figure 2 As shown, a loading device 100 provided in one embodiment of the present application is used to preload an implant 200 to shrink the implant 200 to a suitable diameter, thereby facilitating the subsequent loading of the implant 200 into a delivery device. In the embodiment of the present application, the implant 200 includes but is not limited to implantable medical devices such as valve stents, filters, occluders or heart valves. Among them, the valve stent can be a mitral valve stent or a tricuspid valve stent.

[0037] Combination Figure 1 and Figure 2 As shown, the loading device 100 includes a closing member 10 and a dragging assembly 20. The closing member 10 has a hollow channel 10c whose diameter is generally decreasing. It should be noted that the diameter of the hollow channel 10c may be gradually decreasing, or may be first decreased, then increased, and then decreased again. As long as the diameter of the hollow channel 10c is generally decreasing, the implant 20 passing through the closing member 10 can be pressed and gripped.

[0038] For the convenience of description, the end of the closing member 10 corresponding to the hollow channel 10c with a larger diameter is called the "first end 10a", and the end of the closing member 10 corresponding to the hollow channel 10c with a smaller diameter is called the "second end 10b", that is, the diameter of the hollow channel 10c at the second end 10b is smaller than the diameter of the hollow channel 10c at the first end 10a. It should be noted that the inner wall of the hollow channel 10c smoothly transitions from the first end 10a to the second end 10b, so that when the implant 200 passes through the hollow channel 10c, the inner wall of the hollow channel 10c will not scratch the implant 20.

[0039] The drag component 20 is used to capture one end of the implant 200 and to pull the implant 200 through the hollow channel 10c. Since the inner wall of the hollow channel 10c smoothly transitions from the first end 10a to the second end 10b, and the diameter of the hollow channel 10c at the second end 10b is smaller than the diameter of the hollow channel 10c at the first end 10a, the hollow channel 10c can uniformly compress the implant 200 during the process of the implant 200 entering the hollow channel 10c from the first end 10a and moving out from the second end 10b by the drag component 20, so that the implant 200 maintains good symmetry during the contraction process. It should be noted here that in the present application, the uniformity during the loading process of the implant 200 refers to the consistency of the synchronous contraction amount in the radial direction during the contraction process of the implant 200; accordingly, the symmetry during the loading process of the implant 200 refers to the shape of the implant 200 that always maintains the center line of the hollow channel 10c as the rotation center during the contraction process.

[0040] Combination Figure 2 and Figure 3 As shown, the drag assembly 20 includes a gripping member 21, a limiting cover 22, and a plurality of clamping arms 23. The limiting cover 22 is limited to the gripping member 21 in the radial direction of the gripping member 21, and the limiting cover 22 can move axially relative to the gripping member 21. For example, in some embodiments, the limiting cover 22 has a through hole 22a, and the diameter of the through hole 22a is consistent with the diameter of the gripping member 21. In this way, the gripping member 21 is penetrated through the through hole 22a, and the limiting cover 22 can be sleeved on the gripping member 21. At this time, the limiting cover 22 can move along the axial direction of the gripping member 21 and is limited radially to the gripping member 21.

[0041] The plurality of clamping arms 23 are arranged at intervals around the axial direction of the holding member 21. When the limiting cover 22 moves axially toward the clamping arms 23 relative to the holding member 21, the limiting cover 22 pushes the closing member 10 to move axially along the holding member 21, so that the closing member 10 radially presses the plurality of clamping arms 23 and the implant 200 inward. In this way, the plurality of clamping arms 23 can be kept in a closed state and the implant 200 can be compressed.

[0042] Furthermore, a plurality of clamping arms 23 are evenly arranged around the axial direction of the gripping member 21 to improve the uniformity of the traction force applied to the implant 200 .

[0043] It should be noted that the limit cover 22 has a limit space 22b. When the limit cover 22 moves to the limit position on the side where the clamping arm 23 is located, the end of the clamping arm 23 connected to the gripping member 21 is accommodated in the limit space 22b, so that the limit cover 22 radially squeezes the clamping arm 23 inward, thereby maintaining the clamping arm 23 in a retracted state. It should be noted that the limit cover 23 can radially squeeze all the clamping arms 23, or can radially squeeze only a part of the clamping arms 23, which is not limited here.

[0044] Furthermore, the center line of the limiting space 22b is coaxial with the center line of the through hole 22a, so that the radial extrusion of the multiple clamping arms 23 by the limiting space 22b can be used to make the multiple clamping arms 23 keep one end of the implant 200 coaxial with the gripping member 21, so as to improve the uniformity and symmetry of the implant 200 during the loading process. In this embodiment, the limiting cover 22 can be a rotating body with the center line of the through hole 22a as the axis. At this time, the thickness of the peripheral side wall of the limiting cover 22 is uniform, and the whole is a sleeve structure, which is convenient for production and processing. Of course, in some embodiments, the outer peripheral surface of the limiting cover 22 may not be a cylindrical surface. For example, the cross-sectional shape of the outer peripheral surface of the limiting cover 22 is an ellipse, a triangle or a quadrilateral.

[0045] Combination Figures 4 to 6 The clamping arm 23 is a slender structural member having a first end and a second end opposite to each other. Specifically, the shape of the clamping arm 23 includes but is not limited to a rod-like, a wire-like or a filament-like shape. In this embodiment, the first end of the clamping arm 23 is rotatably connected to the holding member 21, and the second end of the clamping arm 23 is formed with a hook 23a, which is used to cooperate with the matching portion 200a of the implant 200, so that when the clamping arm 23 rotates radially inward relative to the holding member 21 along the radial direction of the holding member 21, the hook 23a pulls the matching portion 200a to move closer to the center line of the holding member 21. In this way, the hooks 23a of the multiple clamping arms 23 can be used to radially compress the matching portion 200a of the implant 200, so that the implant 200 is not easy to loosen from the clamping arm 23, thereby improving the operational stability. It should be noted here that the inner side refers to the side of the holding piece 21 close to its center line, that is, when the clamping arms 23 rotate inwardly relative to the holding piece 21 along the radial direction of the holding piece 21, the multiple clamping arms 23 move closer to the center line of the holding piece 21.

[0046] Further, the shape of the hook 23a can be V-shaped or U-shaped, so as to enhance the stability of the capture of the matching portion 200a of the implant 200. It is particularly noted here that when the hook 23a is V-shaped, it can reduce the difficulty of capturing the implant 200, so that the matching portion 200a of the implant 200 can be designed to be simple. Exemplarily, the matching portion 200a of the implant 200 is a rod-shaped member at the end of the implant 200, and the rod-shaped member is provided with a hole (not shown in the figure), and the hook 23a is used to capture the implant 200 by the hook 23a by the matching with the hole.

[0047] It should be noted that, in some embodiments, a mechanism such as a button or a connecting rod 26 may be provided in the gripping member 21 to improve the capture efficiency of the clamping arm 23 on the implant 200, so as to further enhance the convenience of operation.

[0048] Combination Figures 7 to 9 As shown, at least a portion of the gripping member 21 is formed with a lumen 21a, and a sidewall corresponding to the lumen 21a is provided with an air avoidance groove 21b. The loading device 100 includes a moving member 25 and a plurality of connecting rods 26. The moving member 25 is disposed in the lumen 21a, and is capable of moving axially along the gripping member 21 in the lumen 21a. The moving member 25 is moved axially relative to the gripping member 21, so that the plurality of connecting rods 26 respectively drive the corresponding clamping arms 23 to rotate relative to the gripping member 21, thereby realizing the opening and closing of the plurality of clamping arms 23 relative to the gripping member 21. In this embodiment, a plurality of connecting rods 26 are inserted into the air avoidance groove 21b, and the two ends of each connecting rod 26 are respectively hinged to the moving member 25 and the correspondingly arranged clamping arm 23, so that when the moving member 25 moves axially relative to the gripping member 21, the moving member 25 drives the corresponding clamping arm 23 to rotate relative to the gripping member 21 through the connecting rod 26. In this process, the avoidance groove 21b provides an avoidance space for the movement of the connecting rod 26 to reduce interference with the movement of the connecting rod 26. The number of the avoidance grooves 21b can be the same as the number of the connecting rods 26, so that the connecting rods 26 are arranged in a one-to-one correspondence through the plurality of avoidance grooves 21b. Of course, the design size of the avoidance groove 21b can also be increased so that two or more connecting rods 26 share one avoidance groove 21b.

[0049] The number and shape of the air-avoiding grooves 21b are not limited here, as long as they can meet the air-avoiding requirements when the connecting rod 26 moves. For example, the shape of the air-avoiding grooves 21b includes but is not limited to a strip groove or an elliptical groove extending along the axial direction of the grip 21.

[0050] It should be noted that the moving member 25 can be a push-pull rod movably disposed on the gripping member 21, or a moving seat with a push button. In this embodiment, the operator can operate the push-pull rod or the push button to achieve axial movement of the moving member 25 relative to the gripping member 21, so that the connecting rod 26 drives the clamping arm 23 to rotate relative to the gripping member 21, thereby opening outward or closing inward.

[0051] In some embodiments, the loading device 100 further includes a driving member (not shown), which is connected to the moving member 25. The driving member is used to drive the moving member 25 to move axially relative to the holding member 21. Specifically, a driving member such as a telescopic cylinder or a telescopic motor can be provided in the lumen 21a of the holding member 21, and the driving member is connected to the moving member 25, so that the moving member 25 can be moved axially relative to the holding member 21 by the driving member in an electrically driven manner, thereby further improving the convenience of operation.

[0052] The multiple clamping arms 23 can be directly rotatably connected to the holding member 21, or can be indirectly rotatably connected to the holding member 21 through other structural members, as long as the multiple clamping arms 23 are evenly arranged around the axial direction of the holding member 21 and can be opened and closed with the holding member 21 as the center.

[0053] See again Figure 3 As shown, the end of the holding member 21 is coaxially connected to the limiting boss 24. The limiting boss 24 and the holding member 21 can be integrally formed. For example, the limiting boss 24 and the holding member 21 can be a metal structure integrally formed by casting, or a plastic structure integrally formed by injection molding. Of course, the limiting boss 24 and the holding member 21 can also be integrally formed by machining such as cutting and welding. In some embodiments, the limiting boss 24 can also be connected to the end of the holding member 21 by means of threaded connection or plug-in fitting. The connection method between the holding member 21 and the limiting boss 24 is not described here.

[0054] In this embodiment, a plurality of clamping arms 23 are connected to the gripping member 21 via a limiting boss 24. Figure 3 and Figure 4 As shown, the clamping arm 23 is rotatably connected to the limiting boss 24, and is evenly arranged around the central axis of the limiting boss 24. It should be noted here that in the embodiment of the present application, the axial uniform arrangement of one object around another object refers to the arrangement of one object in a circular array with the axis of the other object as the central axis. Taking the axial uniform arrangement of multiple clamping arms 23 around the gripping member 21 as an example, the multiple clamping arms 23 are equally spaced from each other on the one hand; on the other hand, the multiple clamping arms 23 are installed on the gripping member 21 at a certain rotation angle with the axial direction of the gripping member 21 as the center line.

[0055] Furthermore, the limiting boss 24 is provided with a plurality of grooves 24a arranged at equal intervals along the circumference, and one end of the plurality of clamping arms 23 is respectively arranged on the side walls of the grooves 24a. Under this structural setting, the end of the clamping arm 23 is accommodated by the grooves 24a, so that the connection position between the clamping arm 23 and the limiting boss 24 will not protrude from the edge of the limiting boss 24, which is conducive to maintaining the smoothness around the plurality of clamping arms 23, so that the limiting boss 24 can subsequently maintain a good fit with the inner wall corresponding to the second end 10b of the closing member 10. It can be understood that, based on the fact that the clamping arm 23 can be retracted inwardly relative to the gripping member 21, in this embodiment, the clamping arm 23 is rotationally connected to the side wall of the groove 24a.

[0056] In some embodiments, the groove 24a passes through the limiting boss 24 along the axial direction of the clamping arm 23, so that the groove 24a can be used to meet the needs of accommodating and avoiding air of other structural parts. Figure 7 and Figure 8 As shown, in an embodiment in which the loading device 100 includes a moving member 25 and a plurality of connecting rods 26. Based on the fact that the connecting rod 26 is used to transmit the power of the moving member 25 to the corresponding clamping arm 23, the connecting rod 26 will have a certain movement space relative to the holding member 21; accordingly, when the connecting rod 26 drives the clamping arm 23 to retract relative to the holding member 21, the connecting rod 26 will occupy the circumferential space. In this embodiment, the groove 24a can be used to provide a space for the connecting rod 26 to avoid air, so that the connecting rod 26 is retracted to the inner side of the edge of the limiting boss 24. Specifically, when the limiting boss 24 drives one end of the plurality of clamping arms 23 to be accommodated together in the limiting space 22b of the limiting cover 22, the connecting rod 26 passes through the groove 24a, so that the overall structure of the loading device 100 is compact, and interference with the connecting rod 26 when it moves relative to the holding member 21 is avoided.

[0057] Based on the coaxial connection between the limiting boss 24 and the holding piece 21, and the multiple clamping arms 23 are evenly arranged around the central axis of the limiting boss 24, the multiple clamping arms 23 are arranged in a circular array with the axial direction of the holding piece 21 as the center line. At this time, the coaxiality between the multiple clamping arms 23 and the holding piece 21 is good, so that when the holding piece 21 passes through the hollow channel 10c of the closing piece 10, the radial squeezing force on the surrounding of the implant 200 when the multiple clamping arms 23 capture the implant 200 is uniform and consistent, so as to maintain the synchronous contraction of the implant 200 in the radial direction, and improve the uniformity and symmetry of the implant 200 during loading.

[0058] The edge contour of the limiting boss 24 in the axial direction around the gripping member 21 is circular, and the limiting boss 24 is cylindrical as a whole. Of course, the two end faces of the limiting boss 24 can be conical surfaces. Specifically, the limiting boss 24 includes two mutually connected truncated cones 24b, the ends of the two truncated cones 24b with larger diameters are connected to each other, and the ends with smaller diameters respectively form the two ends of the limiting boss 24. The shape of the limiting boss 24 is not limited here, as long as the limiting boss 24 is coaxially arranged with the gripping member 21 and can adapt to the uniform arrangement of multiple clamping arms 23 around the axial direction of the gripping member 21.

[0059] The diameter of the limiting boss 24 is larger than the diameter of the holding piece 21, so that while maintaining the thinner holding piece 21, the limiting boss 24 can provide a sufficiently large circumference to accommodate the setting of multiple clamping arms 23 and avoid the clamping arms 23 being too compact to be conducive to clamping the implant 200.

[0060] It should be noted that when the cross section of the limiting boss 24 or the gripping member 21 is not a standard circle, the corresponding diameter refers to the diameter of the smallest circumscribed circle. Taking the limiting boss 24 as an example, when the edge contour of the limiting boss 24 around the gripping member 21 in the axial direction is non-circular, the diameter of the smallest circumscribed circle of the edge contour of the limiting boss 24 is the diameter of the limiting boss 24.

[0061] Combination Figure 1 and Figure 2 As shown, the limiting cover 22 has the ability to ensure that the limiting boss 24 and the hollow channel 10c of the closing member 10 remain coaxial by abutting against the closing member 10. Specifically, the end face of the limiting cover 22 abuts against the end face where the second end 10b of the closing member 10 is located, and when the end face of the limiting cover 22 abuts against the end face where the second end 10b of the closing member 10 is located, the limiting cover 22 limits the closing member 10 coaxially to the holding member 21. It can be understood that since the limiting cover 22 is limited to the holding member 21 in the radial direction of the holding member 21, when the limiting cover 22 abuts against the second end 10b of the closing member 10 and pushes the closing member 10 along the holding member 21, the limiting cover 22 limits the relative movement between the closing member 10 and the holding member 21 in the radial direction by abutting against the closing member 10, thereby achieving the positioning effect of radially limiting the closing member 10 to the holding member 21.

[0062] In the embodiment where the edge profile of the limiting boss 24 in the axial direction around the holding member 21 is circular, the diameter of the limiting boss 24 is equal to the diameter of the hollow channel 10c at the second end 10b. In this way, as the holding member 21 pulls the implant 200 in the direction from the first end 10a to the second end 10b relative to the closing member 10, the limiting boss 24 gradually approaches the second end 10b, and finally abuts against the inner wall of the hollow channel 10c at the second end 10b. At this time, the limiting boss 24 is limited in the hollow channel 10c in the radial direction, so that the limiting boss 24 is coaxially aligned with the hollow channel 10c, so as to further improve the uniformity and symmetry of the traction implant 200 in the overall process of passing through the hollow channel 10c.

[0063] For ease of understanding, the working principle of the loading device 100 in one embodiment is described below by taking the implant 200 as a valve stent as an example, but it does not mean that the implant 200 is limited to the valve stent.

[0064] Combination Figure 1 and Figure 2 As shown, when the valve stent (i.e., implant 200) is preloaded, the claws 23a of the multiple clamping arms 23 respectively hook the multiple matching parts 200a of the valve stent (e.g., the wave rods located at the proximal end of the valve stent). Then, the multiple clamping arms 23 are pulled through the hollow channel 10c of the closing member 10 by the holding member 21, and the valve stent is gradually shrunk by utilizing the characteristic that the diameter of the hollow channel 10c gradually decreases in the direction from the first end 10a to the second end 10b. In this process, the end face of the limiting cover 22 abuts against the end face where the second end 10b of the closing member 10 is located, so that the limiting cover 22 is used to maintain the coaxiality of the closing member 10 and the holding member 21, so that when the holding member 21 pulls the valve stent through the hollow channel 10c of the closing member 10 through the multiple clamping arms 23, the valve stent is uniformly shrunk on the circumference, thereby improving the uniformity and symmetry of the valve stent loading process.

[0065] As the dragging assembly 20 as a whole continues to pull the valve stent out of the hollow channel 10c from the second end 10b, the limiting boss 24 with the same diameter as the second end 10b of the hollow channel 10c will fit with the inner wall of the hollow channel 10c of the conical sleeve. At this time, radial positioning is achieved by utilizing the cooperation between the limiting boss 24 and the hollow channel 10c, and then the holding piece 21 can move along the axis relative to the closing piece 10, but cannot move radially relative to the closing piece 10, thereby ensuring the coaxiality of the multiple clamping arms 23 connected to the holding piece 21 together with the valve stent and the hollow channel 10c of the closing piece 10, so as to further improve the uniformity and symmetry of the valve stent when passing through the hollow channel 10c.

[0066] After the limiting boss 24 is pulled out from the hollow channel 10c of the closing member 10, the limiting boss 24 will gradually enter the limiting space 22b of the limiting cover 22, so that the multiple clamping arms 23 are accommodated in the limiting space 22b together with one end connected to the limiting boss 24. At this time, the inner wall of the limiting cover 22 is used to support the multiple clamping arms 23, so that the multiple clamping arms 23 are gathered inward to clamp one end of the valve stent and enter the limiting space 22b together. Therefore, the limiting cover 22 can prevent the clamping arms 23 from bouncing outward, so that after the multiple clamping arms 23 are pulled out from the second end 10b of the closing member 10, the multiple clamping arms 23 can still keep pressing and gripping the valve stent, reducing the probability of the valve stent being separated from the clamping arms 23 due to elastic outward bouncing.

[0067] Combination Figure 6 As shown, when the valve stent is completely pulled out from the second end 10b of the closing member 10, the valve stent as a whole is compressed into a uniform cylindrical shape. It can be seen that by adopting the loading device 100 of the present application, the valve stent is pulled into the hollow channel 10c from the first end 10a of the closing member 10 by using the drag component 20, and the hollow channel 10c is pulled out from the second end 10b, so that the closing member 10 uniformly compresses the valve stent, thereby improving the uniformity and symmetry of the valve stent during loading, and then reducing the probability of adverse deformation of the valve stent during the loading process and subsequent valve stents. Moreover, this loading device 100 is simple to operate, and only one end of the implant 200 needs to be captured by the drag component 20, and the implant 200 can be dragged axially through the hollow channel 10c of the closing member 10. Therefore, the loading device 100 of the present application can achieve the purpose of reducing the complexity of the pre-loading operation and reduce the operation time.

[0068] It should be noted that the mating portion 200a of the implant 200 is a structural portion of the implant 200 itself, which can be rod-shaped or mesh-shaped. When the implant 200 is preloaded with the loading device 100 to compress the implant 200, the force exerted by the drag component 20 on the implant 200 is concentrated on the mating portion 200a at one end of the implant 200, thereby reducing the probability of abnormal deformation of the implant 200 when passing through the closing member 10. For example, in combination with Figure 8 and Fig. 9 As shown, the implant 200 is an uncompressed nickel-titanium self-expanding valve stent. After being compressed by the loading device 100 of the present application, the shape of the originally complex nickel-titanium self-expanding valve stent is compressed into a uniform and symmetrical cylindrical shape to facilitate the subsequent loading of the valve stent into the delivery device.

[0069] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0070] The above embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several modifications and improvements can be made without departing from the inventive concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. A loading device, characterized in that: include: A closing piece, the closing piece having a first end and a second end and a hollow channel extending through the first end and the second end, the inner wall of the hollow channel smoothly transitioning from the first end to the second end, and a diameter of the hollow channel at the second end being smaller than a diameter of the hollow channel at the first end; A dragging assembly is used to capture one end of the implant and to pull the implant from the first end into the hollow channel and out from the second end, so that the hollow channel compresses the implant.

2. The loading device according to claim 1, characterized in that: The dragging assembly includes a holding piece, a limit cover and a plurality of clamping arms, wherein the limit cover is limited at the holding piece in a radial direction thereof and can move axially relative to the holding piece, and a plurality of clamping arms are arranged at axial intervals around the holding piece, and when the limit cover moves axially toward the clamping arm relative to the holding piece, the limit cover pushes the closing piece to move axially along the holding piece, so that the closing piece squeezes the plurality of clamping arms and the implant radially inward.

3. The loading device according to claim 2, characterized in that: The limiting cover has a limiting space. When the limiting cover moves to the limit position toward the side where the clamping arm is located, one end of the clamping arm connected to the holding member is accommodated in the limiting space, so that the limiting cover presses the clamping arm radially inward.

4. The loading device according to claim 2 or 3, characterized in that: The clamping arm is a slender structural member having a first end and a second end opposite to each other. The first end of the clamping arm is rotatably connected to the holding member, and the second end of the clamping arm is formed with a hook claw, which is used to cooperate with the matching portion of the implant so that when the clamping arm rotates radially inward relative to the holding member along the holding member, the hook claw pulls the matching portion toward the center line of the holding member.

5. The loading device according to claim 4, characterized in that: The end of the holding member is coaxially connected to the limiting boss, and the clamping arms are rotatably connected to the limiting boss and are evenly arranged around the central axis of the limiting boss.

6. The loading device according to claim 5, characterized in that: The limiting boss is provided with a plurality of grooves which are arranged at equal intervals along the circumference, and one ends of the plurality of clamping arms are respectively and correspondingly arranged on the side walls of the grooves.

7. The loading device according to claim 5, characterized in that: The diameter of the limiting boss is larger than the diameter of the holding member; And / or, the edge contour of the limiting boss in the axial direction around the holding member is circular, and the diameter of the limiting boss is equal to the diameter of the hollow channel at the second end position.

8. The loading device according to claim 4, characterized in that: At least a portion of the holding member is formed with a tubular cavity, and a side wall corresponding to the tubular cavity is provided with a gas avoidance groove; the loading device includes a moving member and a plurality of connecting rods, and the plurality of connecting rods are passed through the gas avoidance groove, and the two ends of each connecting rod are respectively hinged to the moving member and the corresponding clamping arm, and the moving member is arranged in the tubular cavity and can move in the tubular cavity along the axial direction of the holding member, so that the connecting rod drives the corresponding clamping arm to rotate relative to the holding member.

9. The loading device according to claim 8, characterized in that: It also includes a driving member, which is connected to the moving member and is used to drive the moving member to move axially relative to the holding member.

10. The loading device according to claim 2, characterized in that: The end surface of the limiting cover abuts against the end surface of the second end of the closing member, and when the end surface of the limiting cover abuts against the end surface of the second end of the closing member, the limiting cover limits the closing member coaxially to the holding member.

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