Traction device capable of degrading left auricle plugging device

Abstract

The invention belongs to the technical field of medical instruments, and relates to a traction device of a degradable left atrial appendage occluder, which comprises a body, a display unit for displaying a traction signal and a fixing assembly are arranged on the body, and the fixing assembly is slidably connected with the body through a conversion assembly. The conversion assembly is used for converting the moving signal of the fixing assembly into a display signal which can be displayed on the display unit; one end of the conveying steel cable is connected with the fixing assembly, and the other end of the conveying steel cable is connected with the left auricle plugging device; according to the degradable left atrial appendage occluder, the fixing assembly is slidably connected with the body, so that external traction force of the degradable left atrial appendage occluder can be buffered, the pulling force of the body cannot directly act on the conveying steel cable, and the operation experience of a user is improved; meanwhile, the traction force of the fixing assembly is converted into a visual signal through the conversion assembly, an operator can conveniently apply the traction force more visually, and the risk that the plugging device is displaced and disengaged due to the fact that the traction force is too large is reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of medical devices, and in particular relates to a traction device for a degradable left atrial appendage occluder. Background Art

[0002] Left atrial appendage occlusion (LAA) is a procedure that prevents the formation of thrombi within the LAA during atrial fibrillation by occluding the LAA, thereby reducing the risk of long-term disability or death due to thromboembolism in patients with atrial fibrillation. Currently, the most commonly used occluder is the nickel-titanium alloy LAA occluder. With the development of innovative materials, degradable LAA occluders are gradually being used. To determine whether the LAA occluder is securely attached to the atrial appendage, clinicians typically perform external traction on the LAA occluder and use imaging to capture deformation and displacement of the occluder to comprehensively assess its fixation. However, degradable LAA occluders cannot be directly visualized under X-rays, and excessive traction can affect the morphology and position of the LAA occluder, thereby affecting the implantation effect, safety, and stability.

[0003] Therefore, it is necessary to design a traction device for degradable left atrial appendage occluder to quantitatively evaluate the traction effect through in vitro visualization and conduction of fixation force to help the surgeon determine whether the left atrial appendage implant is stable. Summary of the Invention

[0004] In view of this, the present invention provides a traction device for a left atrial appendage occluder. By arranging a conversion component on the traction device, the traction force of the delivery cable on the fixing device can be transmitted and converted into other displayable signals, and displayed through a display unit to facilitate in vitro visual observation of the traction of the delivery cable on the degradable left atrial appendage occluder, thereby judging whether the occluder is fixed.

[0005] The technical solution adopted in the present invention is: A traction device for a left atrial appendage occluder comprises: a main body, on which is provided a display unit for displaying a traction signal; a fixing component, which is slidably connected to the main body via a conversion component, and the conversion component is used to convert the movement signal of the fixing component into a display signal that can be displayed on the display unit; and a delivery cable, one end of the delivery cable is connected to the fixing component, and the other end is connected to the left atrial appendage occluder.

[0006] Further optimization of the technical solution of the present invention is that the fixing assembly includes a locking nut and a movable shaft, the locking nut is connected to one end of the movable shaft by a thread, and a first limiting hole is provided at the center of the locking nut, and the first limiting hole is used for the conveying steel cable to pass through; the end of the movable shaft corresponding to the locking nut is provided with a locking mechanism for locking the conveying steel cable.

[0007] Further optimization of the technical solution of the present invention is that the locking mechanism includes a locking silicone ring and a second limiting hole arranged at the end of the movable shaft, the locking silicone ring is arranged between the locking nut and the movable shaft, and an extrusion platform is arranged on the movable shaft; the conveying steel cable passes through the first limiting hole, the locking silicone ring and the second limiting hole in sequence.

[0008] Further optimization of the technical solution of the present invention is that the locking mechanism consists of the first conical limiting hole and a fixed tube arranged at one end of the movable shaft, and at least one through groove is provided in the length direction of the side wall of the fixed tube. The through groove makes the inner diameter of the fixed tube variable under the action of the first limiting hole, and the initial inner diameter of the fixed tube is larger than the diameter of the conveying steel cable, and the inner diameter of the fixed tube is smaller than the diameter of the conveying steel cable under external force compression; the inner diameter of the first limiting tube gradually decreases from close to one end of the movable shaft to the other end, and the maximum diameter is not less than the outer diameter of the fixed tube in the initial state.

[0009] Further optimization of the technical solution of the present invention is that a sliding plate is provided at one end of the movable shaft away from the locking nut, and a sliding groove corresponding to the sliding plate is provided on the main body, and a positioning display plate is provided on the sliding plate, and the positioning display plate corresponds to the display unit, and the display unit is a transparent panel marked with a prompt sign.

[0010] According to a further optimization of the technical solution of the present invention, the conversion component is a spring or a rubber band, a hook platform is provided at the free end of the sliding plate, one end of the spring or the rubber band is fixed to the hook platform, and the other end is fixed to the main body.

[0011] According to a further optimization of the technical solution of the present invention, the display unit is a display screen, the conversion assembly includes a tension sensor, the tension sensor is respectively fixed on the movable shaft and the main body, and the tension sensor is electrically connected to the display screen through a controller.

[0012] In a further optimization of the technical solution of the present invention, an outer boss is provided on the outer side wall of the locking nut.

[0013] According to a further optimization of the technical solution of the present invention, the main body includes a first shell and a second shell, and the first shell and the second shell are connected by snap-fitting or by screws.

[0014] In a further optimization of the technical solution of the present invention, the outer walls of the first shell and the second shell are both provided with anti-slip structures.

[0015] Beneficial effects of the present invention: By slidingly connecting the fixing component with the main body, the external traction force of the degradable left atrial appendage occluder can be buffered, and the pulling force of the main body will not be directly applied to the delivery cable, thereby improving the user's operating experience; at the same time, the traction force of the fixing component is converted into a visual signal through the conversion component, which facilitates the operator to apply traction more intuitively and reduces the risk of displacement of the occluder due to excessive pulling force. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The above and other objects, features and advantages of the present invention will become more apparent through the following description of the embodiments of the present invention with reference to the accompanying drawings, in which: Figure 1 This is a schematic structural diagram of the pulling device of the present invention in an applied state; Figure 2 It is a schematic diagram of the explosion structure of the pulling device of the present invention; Figure 3 It is a structural schematic diagram of the locking nut of the present invention; Figure 4 yes Figure 3 Schematic diagram of the cross-sectional structure along the middle edge BB; Figure 5 This is a schematic structural diagram of a moving shaft in one embodiment of the present invention; Figure 6 is a structural schematic diagram of the first shell of the present invention; Figure 7 is a structural schematic diagram of the second shell of the present invention; Figure 8 This is a schematic diagram of the structure of a display unit in one embodiment of the present invention; Figure 9 It is a schematic diagram of the cross-sectional structure of the left atrial appendage occluder.

[0017] Figure: 1, body; 2, moving shaft; 3, locking nut; 4, delivery cable; 5, left atrial appendage occluder; 6, left atrial appendage; 7, locking silicone ring; 8, spring; 9, transparent panel; 11. First shell; 111. First slide groove; 112. First column; 113. First card slot; 12. Second shell; 121. Second slide groove; 122. Second column; 123. Second card slot; 21. Extrusion table; 22. Sliding plate; 23. Positioning display panel; 24. Hook table; 25. Second limiting hole; 31. First limiting hole; 32. Boss; 51. Inner plate; 52. Anchor hook; 53. Outer plate; 54. Locking ring; 91. Locking area; 92. Safety area; 93. Warning area. DETAILED DESCRIPTION

[0018] The present invention is described below based on the following embodiments, but the present invention is not limited to these embodiments. In the following detailed description of the present invention, some specific details are described in detail. In order to avoid obscuring the essence of the present invention, well-known methods, processes, procedures, and components are not described in detail.

[0019] Furthermore, persons of ordinary skill in the art will appreciate that the figures provided herein are for illustration purposes only and are not necessarily drawn to scale.

[0020] Unless the context clearly requires otherwise, throughout the specification and claims, the words "include," "comprising," and similar words should be construed in an inclusive sense rather than an exclusive or exhaustive sense; that is, in the sense of "including but not limited to."

[0021] In the description of the present invention, it should be understood that the terms "first", "second", etc. are used for descriptive purposes only and should not be understood to indicate or imply relative importance. In addition, in the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0022] Combined with the following Figure 1-9 The technical solution of this application is described in detail.

[0023] Regarding the occluder provided by patent number 202210178730.5 in the prior art, it is necessary to judge its two working states during use. One is to judge whether the anchor hook 52 is hung on the left atrial appendage 6; the other is to judge whether the inner and outer disc 53 structures are locked. The specific surgical operator judges whether it is fixed based on the resistance of traction. The traction force is generally 1-2N. If you are not careful, the occluder will be displaced or fall off due to excessive traction. In order to facilitate the understanding of the user of the traction device of this application, the structure of the occluder is briefly introduced as follows: Figure 9 As shown, the mesh stent is formed by weaving and shaping biodegradable filaments. After shaping, the skeleton is divided into an inner disc 51 and an outer disc 53. The proximal end of the outer disc 53 is connected to a threaded rivet head, which is thermoformed from biodegradable filaments. The outer rivet head has a threaded outer layer (connected to the delivery cable 4) and a through hole in the center. The inner and outer discs 53 are sutured to the inner side of the skeleton with a biodegradable bluff body. The inner disc is sutured with an anchor hook 52 for hooking onto the left atrial appendage 6. The anchor hook 52 is formed from a shape-memory material and shaped. Once connected to the left atrial appendage, the movement of the inner disc is restricted, meaning it will not shift during traction. The inner and outer discs 53 are locked and secured by a locking ring 54. The end of the locking ring 54, which is closest to the traction device, is a deformable ring that can pass through the inner hole of the threaded rivet head. The other end of the locking ring 54 is fixed to the inner disc. Once the locking ring 54 is locked, the inner disc 51 and outer disc 53 are in contact. After pulling the outer disk 53, if the outer disk 53 is deformed or moved, it is unlocked; if the outer disk 53 does not change, it is locked.

[0024] Therefore, in response to this technical problem, the technical solution of the present invention designs a pulling device for the left atrial appendage occluder 5, which reduces the difficulty of pulling through visual operation, and the use of this device makes it more convenient to judge whether the occluder is fixed. Specifically, the pulling device for the left atrial appendage occluder 5 includes: a body 1, a fixing component, a conversion component and a conveying cable 4. One end of the conveying cable 4 is connected to the body 1 through the fixing component and the conversion component, and the other end is connected to the rivet head of the left atrial appendage occluder 5. The operator applies external force to the body 1 to achieve the effect of pulling the conveying cable 4. The fixing component is slidably connected to the body 1 through the conversion component. The conversion component is used to convert the movement signal of the fixing component into a display signal that can be displayed on the display unit. The display unit is provided on the body 1 to facilitate direct display of the pulling signal.

[0025] In order to facilitate the fixation of the conveying steel cable 4, the fixing assembly includes a locking nut 3 and a movable shaft 2, the locking nut 3 is connected to one end of the movable shaft 2 by a thread, and a first limiting hole 31 is provided at the center of the locking nut 3, and the first limiting hole 31 is used for the conveying steel cable 4 to pass through; the end of the movable shaft 2 corresponding to the locking nut 3 is provided with a locking mechanism for locking the conveying steel cable 4. The locking mechanism includes a locking silicone ring 7 and a second limiting hole 25 arranged at the end of the movable shaft 2. The locking silicone ring 7 is arranged between the locking nut 3 and the movable shaft 2, and an extrusion platform 21 is provided on the movable shaft 2; the conveying steel cable 4 passes through the first limiting hole 31, the locking silicone ring 7 and the second limiting hole 25 in sequence. When fixing, the locking silicone ring 7 can be compressed by tightening the locking nut 3, so that the locking silicone ring 7 tightly holds the conveying steel cable 4 to achieve the purpose of fixation; in addition, by arranging an extrusion body on the movable shaft 2, it is convenient to limit the locking silicone ring 7 to prevent the locking silicone ring 7 from entering the thread during the extrusion process.

[0026] With respect to the locking mechanism, another preferred technical solution is that it can be designed to consist of the first conical limiting hole 31 and a fixed tube arranged at one end of the movable shaft 2. Specifically, at least one through groove is provided in the length direction of the side wall of the fixed tube (not shown in the figure), and the through groove extends from one end of the fixed tube close to the locking nut 3, with a length of 0.5-3 cm. The through groove enables the inner diameter of the fixed tube to be variable under the action of the first limiting hole 31. There are preferably 2-3 through grooves, and all the through grooves are evenly distributed on the circumference of the fixed tube, and the initial inner diameter of the fixed tube is larger than the diameter of the conveying cable 4. When the external force is compressed, the inner diameter of the fixed tube is smaller than the diameter of the conveying cable 4. The diameter of the conveying steel cable 4 is large enough so that when pressure is applied to the outer wall of the fixed tube, its inner wall can contact with the conveying steel cable 4, and as the external force increases, the purpose of clamping is achieved; the inner diameter of the first limiting hole 31 gradually decreases from one end close to the movable shaft 2 to the other end, and the maximum diameter is not less than the outer diameter of the fixed tube in the initial state, so that in the process of threading the locking nut 3 and the movable shaft 2, the fixed tube assembly will enter the first limiting hole 31, and as the locking nut 3 moves toward the direction of the movable shaft 2, the pressure exerted by the inner wall of the first limiting hole 31 on the fixed tube becomes greater, thereby compressing the gap of the through groove, reducing the diameter of the fixed tube, and locking and fixing the conveying steel cable 4.

[0027] On the basis of the above embodiment, a sliding plate 22 is provided at one end of the movable shaft 2 away from the locking nut 3, and a slide groove corresponding to the sliding plate 22 is provided on the main body 1. Specifically, the main body 1 includes a first shell 11 and a second shell 12, and the middle of the first shell 11 and the second shell 12 are respectively provided with a first slide groove 111 and a second slide groove 121. The sliding plate 22 can slide freely in the two slide grooves. Preferably, the left and right sides of the sliding plate 22 corresponding to the slide grooves are provided with ridges, and the thickness of the ridges matches the width of the slide groove, which can improve the stability of the slide during movement. A positioning display panel 23 is provided on the sliding plate 22. The positioning display panel 23 is located on the front of the sliding plate 22 and corresponds to the display unit. The display unit is a transparent panel 9 marked with a prompt mark, as shown in FIG. Figure 8As shown, the display panel is marked with a warning zone 93, a safe zone 92, and a locking zone 91 (the locking zone 91 is for the degradable LAA occluder 5, which has a locking function and is used to determine whether the degradable LAA occluder 5 is locked; the safe zone 92 is for the LAA occluder 5 anchor hook 52, which is used to determine whether the degradable LAA occluder 5 is securely attached to the LAA 6; the warning zone is to prevent the operator from applying excessive force and causing the occluder to be pulled out of the LAA 6). This allows the user to control the pulling force according to the position of the positioning display panel 23 on the display panel during the pulling process, keeping the front end of the positioning display panel 23 within the safe zone (when determining whether the LAA occluder 5 is secure, the positioning display panel 23 is pulled within the safe zone 92; when determining whether the LAA occluder 5 is locked, the positioning display panel 23 is pulled within the locking zone 91). The transparent panel 9 is fixed by first and second latch slots 113 and 123 provided on the first and second shells 11 and 12, respectively.

[0028] In an embodiment of a display unit made in conjunction with a transparent panel 9, the conversion component is a spring 8 or a rubber band, and a hook platform 24 is provided at the free end of the sliding plate 22. One end of the spring 8 or the rubber band is fixed to the hook platform 24, and the other end is fixed to the body 1. Specifically, a fixing column is provided on the body 1, and the fixing column includes a first column 112 and a second column 122 respectively provided on the first shell 11 and the second shell 12. When in use, one end of the spring 8 or the rubber band is first set on one of the columns. When the first shell 11 and the second shell 12 are assembled together, the first column 112 and the second column 122 are docked to form a fixing column, and the spring 8 and the rubber band will not fall off. In this embodiment, the distal end of the delivery cable 4 is fixed to the rivet head of the degradable left atrial appendage occluder 5, and the proximal end is inserted into the first limiting hole 31 and the locking silicone ring of the locking nut 3, or inserted into the fixing tube of the locking nut 3 and the movable shaft 2. The proximal end of the delivery cable 4 is fixed by screwing the locking nut and the screwing shaft of the movable shaft 2. By fixing one end of the spring 8 or rubber band of the conversion assembly to the hook platform 24 of the movable shaft 2 and the other end to the fixed column of the housing, the movable shaft 2 can move back and forth within the slide grooves of the first housing 11 and the second housing 12 under the connection of the sliding plate 22. When the main body 1 is pulled externally, the movable shaft 2 will move relative to the first housing 11 and the second housing 12. Since the two are connected by the spring 8 or rubber band, the force generated will be transmitted to the left atrial appendage occluder 5 in the body through the delivery cable 4. The left atrial appendage occluder 5 is hung on the atrial appendage wall. Therefore, the holding force of the left atrial appendage occluder 5 = the pulling force of the delivery cable 4 = the pulling force of the spring 8 = the pulling force of the external hand. When judging whether the left atrial appendage occluder 5 is fixed, the pulling force range is generally 1-2N, and when judging whether the left atrial appendage occluder 5 is locked, the pulling force range is generally 0.3-1N. The main body 1 moves under the action of the pulling force, driving the display unit to move; the movement of the moving shaft 2 drives the movement of the positioning display board 23, so that the display panel of the display unit and the positioning display board 23 move in the opposite direction; thus, it is determined whether the relative displacement is within the safe zone 92, and then the magnitude of the pulling force is calculated by the displacement and the spring 8 coefficient. The conductivity of the force + the exceptional visualization area can be used to determine whether the occluder is firmly fixed. Therefore, this method can control the pulling force used by the operator and accurately determine whether the anchor hook 52 of the left atrial appendage occluder 5 is firmly hung. The specific judgment method is to apply pressure and traction to the main body 1. Under the action of the spring, the moving shaft 2 is displaced. When the positioning display board 23 is used within the safe zone 92, the inner disk 51 of the left atrial appendage occluder 5 is observed by pulling and angiography to determine whether it has moved. If there is no position change, it is determined to be fixed. If there is a position change, it is not fixed.At the same time, when the left atrial appendage occluder 5 is locked, it can also be judged by the self-pulling force, and the pulling force of the main body 1 is controlled to make the positioning display panel 23 located within the range of the locking area 91. While pulling, the angiography is used to observe whether the outer disk 53 of the left atrial appendage occluder 5 has changed. If there is no position change, it means that the locking ring 54 has locked the left atrial appendage occluder 5. If there is a position change, it means that it is not locked.

[0029] For the display unit, an alternative technical solution is that the display unit is a display screen, and the conversion component includes a tension sensor, which can convert the collected tension into an electrical signal and display it on the display screen through the controller. The tension sensor is respectively fixed on the movable shaft 2 and the main body 1, and the tension sensor is electrically connected to the display screen through the controller. In this way, the digital display is more intuitive than the above-mentioned embodiment.

[0030] On the basis of the above embodiment, in order to facilitate the threaded connection between the locking nut 3 and the movable shaft 2, an external boss 32 is provided on the outer wall of the locking nut 3, which makes it convenient for the user to screw it directly by hand, and is easy to use. Of course, the outer side of the locking nut 3 can also be provided with a frosted side or small bumps and other surfaces that can increase friction.

[0031] Preferably, the first shell 11 and the second shell 12 are connected by snap-fitting or by screws. When screws are used, the fixing column in the above embodiment can be used as a screw connection point, thereby achieving fixation between the first shell 11 and the second shell 12 and improving the integrity of the fixing column.

[0032] Preferably, outer walls of the first shell 11 and the second shell 12 are both provided with anti-slip structures.

[0033] It should be understood that the above-mentioned embodiments are merely illustrative and non-restrictive. Without departing from the basic principles of the present invention, various obvious or equivalent modifications or substitutions that can be made by those skilled in the art to the above-mentioned details will be included in the scope of the claims of the present invention.

Claims

1. A traction device for a degradable left atrial appendage occluder, characterized in that: include: A body, wherein a display unit for displaying a traction signal is provided on the body, A fixed component, the fixed component is slidably connected to the body through a conversion component, and the conversion component is used to convert a movement signal of the fixed component into a display signal that can be displayed on the display unit; The fixing assembly comprises a locking nut and a movable shaft, and one end of the movable shaft corresponding to the locking nut is provided with a locking mechanism for locking the conveying steel cable; One end of the delivery cable is connected to the movable shaft, and the other end is connected to the degradable left atrial appendage occluder.

2. The traction device for the degradable left atrial appendage occluder according to claim 1, characterized in that: The locking nut is connected to one end of the movable shaft via a thread, and a first limiting hole is provided at the center of the locking nut, and the first limiting hole is used for the conveying steel cable to pass through.

3. The traction device for the degradable left atrial appendage occluder according to claim 2, characterized in that: The locking mechanism includes a locking silicone ring and a second limiting hole arranged at the end of the movable shaft, and the locking silicone ring is arranged between the locking nut and the movable shaft; the conveying steel cable passes through the first limiting hole, the locking silicone ring and the second limiting hole in sequence.

4. The pulling device for the degradable left atrial appendage occluder according to claim 2, characterized in that: The locking mechanism is composed of the first conical limiting hole and a fixed tube arranged at one end of the movable shaft, and at least one through groove is arranged in the length direction of the side wall of the fixed tube. The through groove makes the inner diameter of the fixed tube variable under the action of the first limiting hole, and the initial inner diameter of the fixed tube is larger than the diameter of the conveying steel cable, and the inner diameter of the fixed tube is smaller than the diameter of the conveying steel cable under the external force compression state; the inner diameter of the first limiting tube gradually decreases from one end close to the movable shaft to the other end, and the maximum diameter is not less than the outer diameter of the fixed tube in the initial state.

5. The traction device for the degradable left atrial appendage occluder according to any one of claims 2 to 4, characterized in that: A sliding plate is arranged at one end of the movable shaft away from the locking nut, and a sliding groove corresponding to the sliding plate is arranged on the main body, a positioning display plate is arranged on the sliding plate, and the positioning display plate corresponds to the display unit, and the display unit is a transparent panel.

6. The pulling device for the degradable left atrial appendage occluder according to claim 5, characterized in that: The conversion component is a spring or a rubber band, a hook platform is provided at the free end of the sliding plate, one end of the spring or the rubber band is fixed on the hook platform, and the other end is fixed on the body.

7. The traction device for the degradable left atrial appendage occluder according to any one of claims 2 to 4, characterized in that: The display unit is a display screen, and the conversion component includes a tension sensor, which is respectively fixed on the moving shaft and the body, and the tension sensor is electrically connected to the display screen through a controller.

8. The pulling device for the degradable left atrial appendage occluder according to claim 7, characterized in that: An outer boss is arranged on the outer side wall of the locking nut.

9. The pulling device for the left atrial appendage occluder according to claims 1-4, characterized in that: The main body includes a first shell and a second shell, and the first shell and the second shell are connected by snap-fitting or by screws.

10. The pulling device for the degradable left atrial appendage occluder according to claim 9, characterized in that: The outer walls of the first shell and the second shell are both provided with anti-slip structures, and the display unit includes a warning area, a safety area and a locking area.

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