Ligation device capable of automatically cutting ligature wire

Abstract

A ligation device capable of automatically cutting a ligature wire, the ligation device comprising a front-section handle (1), a rear-section handle (2), a catheter assembly, a snare (3) and a ligature wire (4), wherein one end of the catheter assembly is connected to the front-section handle (1), the snare (3) is arranged at the other end of the catheter assembly, and a slit is provided in the inner side of the snare (3); a ligature wire (4) passes through the front-section handle (1) and the catheter assembly; one end of the ligature wire (4) is connected to the rear-section handle (2), and the other end of the ligature wire (4) is a wire loop (41) that is retractable in the forward direction and stops in the reverse direction; the wire loop (41) is pre-assembled in the snare (3); a ligature wire cutting assembly is provided in the rear-section handle (2); and when the rear-section handle (2) is separated from the front-section handle (1) and is pulled backwards, the ligature wire (4) is pulled backwards, such that the wire loop (41) is pulled out of the slit to the inner side of the snare (3) and retracts, and when the ligature wire (4) is pulled backwards to reach a preset tension, the ligature wire cutting assembly automatically cuts the ligature wire (4). A ligation operation is achieved by means of pulling a rear-section handle (2) backwards, and automatic ligature wire cutting is performed at a preset node by means of the ligature wire cutting assembly during the operation process without needing to rely on the visual estimation and hand perception of an operating surgeon and thus the problem of manual operation failure or errors is avoided.

Description

Automatic thread tangent ligator

[0001] This application is based on and claims priority to the Chinese patent application with application number 202321699038.3 and application date June 30, 2023. The entire contents of the application are hereby introduced as a whole into this application. Technical Field

[0002] The present application relates to the technical field of medical devices, and in particular to an automatic thread cutter and ligator. Background Art

[0003] The left atrial appendage (LAA) is a long, narrow, tubular blind cavity with irregular shape and multiple tortuosity. It is about the size of a thumb, with an opening ranging from 10 mm to 40 mm. The LAA is rich in pectinate muscles and trabeculae, which can easily generate eddy currents and slow blood flow, making it a prone site for thrombosis.

[0004] Patients with atrial fibrillation (AF) have a significantly increased risk of stroke. Studies suggest that 60% of cardiogenic thrombi in patients with rheumatic heart disease and atrial fibrillation (AF) originate from the left atrial appendage (LAA), and 91% of strokes caused by non-valvular AF are caused by thrombi within the LAA. Therefore, removing the LAA may help reduce left atrial thrombi and stroke.

[0005] Current clinical treatment methods include: oral anticoagulants, radiofrequency ablation, percutaneous left atrial appendage occlusion and surgical left atrial appendage resection. Regardless of which method is used, the clinical effect is not very satisfactory.

[0006] Therefore, left atrial appendage ligation was born, and corresponding matching equipment was also produced.

[0007] Among the existing left atrial appendage ligation devices, such as the Chinese patent document disclosed with application number 202110054297.X, when using the device, a pre-tied ligation coil is delivered to the designated surgical area by a mechanical delivery tool. The operator relies on the external force of his hand to pull the coil to tighten and complete the ligation. The process relies on the visual judgment and hand feeling of the operating doctor as the basis for judging whether the ligation is complete or firm, which is prone to operational errors or mistakes. Application Contents

[0008] The purpose of this application is to provide an automatic tangent ligator, which aims to solve the problem that when using existing left atrial appendage ligation instruments for ligation operations, it is necessary to rely on the visual judgment and hand feeling of the operating doctor, which is prone to operational errors or errors.

[0009] In order to solve the above technical problems, the purpose of this application is achieved through the following technical solutions: providing an automatic tangent ligator, comprising:

[0010] A handle assembly, comprising a detachable front handle and a rear handle;

[0011] a catheter assembly, one end of which is connected to the front section handle;

[0012] a snare, disposed at the other end of the snare, wherein the inner side of the snare is provided with a slit;

[0013] A ligature thread passes through the front section handle and the catheter assembly, one end of the ligature thread is connected to the rear section handle, and the other end of the ligature thread is a coil that can be contracted in the forward direction and stopped in the reverse direction, and the coil is pre-installed in the snare;

[0014] When the rear handle is separated from the front handle and pulled backward, the ligature is pulled backward, so that the coil is pulled out from the slit to the inside of the snare and contracts in the positive direction.

[0015] Wherein, a tangent assembly is provided in the rear section handle. When the rear section handle is separated from the front section handle and pulled back to reach a preset tension, the tangent assembly is driven to move and cut the ligature.

[0016] Furthermore, the rear end of the front section handle is screw-connected with the front end of the rear section handle, and can be separated or screwed together when the rear section handle is rotated relative to the front section handle.

[0017] Furthermore, the tangent component includes:

[0018] a sliding member, slidably mounted in the rear handle and capable of sliding forward and backward, one end of the ligature being connected to the sliding member;

[0019] A connecting rod is installed in the rear handle, one end of the connecting rod is connected to the sliding member, and the other end of the connecting rod is provided with a cutting blade;

[0020] an elastic member, one end of which is connected to the interior of the rear handle and the other end of which is connected to the sliding member;

[0021] When the rear handle is pulled backward, the ligature line drives the sliding member to slide forward and links the elastic member to stretch, while also linking the connecting rod to rotate, so that the wire cutting blade moves toward the ligature line. When the elastic member is stretched to a preset tension, the wire cutting blade cuts the ligature line.

[0022] Furthermore, the connecting rod includes a first connecting rod and a second connecting rod, one end of the first connecting rod is rotatably connected to the sliding member, the other end of the first connecting rod is rotatably connected to one end of the second connecting rod, the rod wall of the second connecting rod is rotatably connected to the inner wall of the rear section handle, and the tangent blade is arranged at the other end of the second connecting rod.

[0023] Furthermore, a strip-shaped opening is provided on the rear handle, and an extension portion is provided on the sliding member, and the extension portion passes through the strip-shaped opening and is exposed to the outside; the other end of the elastic member is connected to the extension portion.

[0024] Furthermore, the elastic member is one of a coil spring and an elastic pull rope.

[0025] Furthermore, a tangent seat is provided in the rear section of the handle, the tangent blade is opposite to the tangent seat, and the ligature is placed on the tangent seat; and a V-shaped opening is provided on the tangent seat opposite to the tangent blade.

[0026] Furthermore, the catheter assembly includes a heat shrink tubing, a flexible catheter and a connecting tube, one end of the flexible catheter is connected to the front end of the front section handle, the heat shrink tubing is covered at the connection between the flexible catheter and the front end of the front section handle, one end of the connecting tube is connected to the other end of the flexible catheter, and the other end of the connecting tube is connected to the snare.

[0027] Furthermore, the internal bone position of the snare is nickel-titanium shape memory alloy wire.

[0028] Furthermore, a developing tungsten wire is embedded in the snare, and a developing winding spring is provided in the connecting tube.

[0029] The present invention provides an automatic tangent ligator, comprising a front handle, a rear handle, a catheter assembly, a snare, and a ligature. One end of the catheter assembly is connected to the front handle, and the snare is disposed at the other end of the snare, with a slit provided on the inside of the snare. The ligature passes through the front handle and the catheter assembly, with one end of the ligature connected to the rear handle and the other end being a coil that can retract in a forward direction and stop in a reverse direction, pre-installed in the snare. The rear handle is provided with a tangent assembly. When the rear handle is separated from the front handle and pulled backward, the ligature is pulled backward, causing the coil to be pulled out of the slit to the inside of the snare and retract. Simultaneously, when the ligature reaches a preset tension, the tangent assembly automatically cuts the ligature. The present invention achieves ligation by pulling the rear handle backward. During operation, the tangent assembly automatically cuts the ligature at a preset node, eliminating the need for the operator's visual judgment and hand feel, thus avoiding manual errors or mistakes. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0031] FIG1 is a schematic structural diagram of an automatic thread tangent ligator provided in an embodiment of the present application;

[0032] FIG2 is a schematic structural diagram of a handle assembly in a separated state provided in an embodiment of the present application;

[0033] FIG3 is a schematic diagram of the internal structure of a back-end assembly provided in an embodiment of the present application;

[0034] FIG4 is a schematic diagram of the structural decomposition of the front end of the automatic thread tangent ligator provided in an embodiment of the present application.

[0035] Description of the symbols in the figure:

[0036] 1. Front handle;

[0037] 2. Rear handle; 21. Sliding member; 211. Extension; 22. First connecting rod; 23. Second connecting rod; 24. Elastic member; 25. Cutting blade; 26. Strip opening; 27. Cutting seat;

[0038] 3. Snare; 31. Tungsten filament;

[0039] 4. Ligature; 41. Coil;

[0040] 5. Heat shrink tubing;

[0041] 6. Flexible catheter;

[0042] 7. Connecting tube; 71. Developing coil spring. Implementation Method

[0043] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0044] It will be understood that when used in this specification and the appended claims, the terms “comprises” and “comprising” indicate the presence of described features, integers, steps, operations, elements and / or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or groups thereof.

[0045] It should also be understood that the terms used in this specification are for the purpose of describing specific embodiments only and are not intended to limit the present application. As used in this specification and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms unless the context clearly indicates otherwise.

[0046] It should be further understood that the term "and / or" used in this specification and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.

[0047] 1-4 , an embodiment of the present application provides an automatic tangent ligator, comprising a handle assembly, a catheter assembly, a snare 3 and a ligature 4;

[0048] The handle assembly includes a detachable front handle 1 and a rear handle 2; one end of the catheter assembly is connected to the front handle 1, and the other end of the catheter assembly is connected to a snare 3, the inner side of which is provided with a slit; a ligature 4 passes through the front handle 1 and the catheter assembly, one end of the ligature 4 is connected to the rear handle 2, and the other end of the ligature 4 is a coil 41 that can be contracted in the forward direction and stopped in the reverse direction, and the coil 41 is pre-installed in the snare 3;

[0049] When the rear handle 2 is separated from the front handle 1 and pulled backward, the ligature 4 is pulled backward, so that the coil 41 is pulled out from the slit to the inside of the snare 3 and contracts forward.

[0050] Among them, a tangent assembly is provided in the rear handle 2. When the rear handle 2 is separated from the front handle 1 and pulled back to reach a preset tension, the tangent assembly is driven to move and cut the ligature 4.

[0051] The operation process of this embodiment is as follows: one end of the snare 3 is transported into the heart through the outer sheath, and the snare 3 is placed on the outside of the inverted left atrial appendage tissue inside the heart cavity. Then, the rear handle 2 is rotated to separate it from the front handle 1, and then the rear handle 2 is pulled backward, so that the coil 41 is pulled out from the slit of the snare 3 to the inside of the snare 3 and shrinks on the tissue to be ligated. As the pulling force of the rear handle 2 is tightened, the tissue ligation is completed and the pulling force reaches the preset pulling force. At this time, the tangent assembly also moves with the pulling force and cuts the ligature line 4, thus completing the automatic tangent after ligation.

[0052] It can be understood that the present embodiment can measure the pulling force required to complete the ligation and design the tangent node of the tangent assembly. For example, the pulling force required to complete the ligation is generally about 30N. When the tangent assembly is subjected to a pulling force of about 30N, it can move to the position of the ligature line 4 and make its own blade collide with the ligature line 4 to achieve cutting. In this way, the rear section handle 2 can be pulled back to complete the tissue ligation and cut the ligature line 4 at the same time. This process does not need to rely on the visual judgment and hand feeling of the operating doctor, and has the advantage of avoiding manual operation mistakes or errors.

[0053] It should be noted that the preset pulling force of 30N is selected in this application based on the actual application scenario, and the numerical value can be adaptively adjusted according to different situations.

[0054] In one embodiment, the rear end of the front handle 1 is screw-connected to the front end of the rear handle 2 , and the rear handle 2 can be separated or connected when it rotates relative to the front handle 1 .

[0055] In this embodiment, a matching snap-fit ​​structure can be provided on the inner wall at the rear end of the front handle 1 and the inner wall at the front end of the rear handle 2, which can be separated by relative rotation, so that it can be locked when not in use and quickly opened when in use. When in use, only the rotation and pulling actions need to be performed, which is simple and convenient to operate.

[0056] Referring to FIG3 , in one embodiment, the thread cutting assembly includes a sliding member 21, a connecting rod, and an elastic member 24; the sliding member 21 is slidably mounted in the rear handle 2 and can slide back and forth, and one end of the ligature 4 is connected to the sliding member 21; the connecting rod is mounted in the rear handle 2, one end of the connecting rod is connected to the sliding member 21, and the other end of the connecting rod is provided with a thread cutting blade 25; one end of the elastic member 24 is connected to the interior of the rear handle 2, and the other end is connected to the sliding member 21;

[0057] Among them, when the rear handle 2 is pulled backward, the ligature line 4 drives the sliding member 21 to slide forward and links the elastic member 24 to stretch, and at the same time links the connecting rod to rotate, so that the wire cutting blade 25 moves toward the ligature line 4. When the elastic member 24 is stretched to a preset tension, the wire cutting blade 25 cuts the ligature line 4.

[0058] In this embodiment, when the rear section assembly is pulled backward, one end of the ligature line 4 generates a forward pulling force on the slider 21, causing the slider 21 to move forward. The forward movement of the slider 21 can push the connecting rod to rotate. When the connecting rod rotates, the cutting blade 25 can be driven to rotate toward the direction of the ligature line 4, so that when the preset pulling force is reached, the cutting blade 25 cuts off the ligature line 4.

[0059] In this embodiment, the elastic member 24 can be a coil spring, an elastic pull rope, or other structures with a rebound function.

[0060] The connecting rod in this embodiment may include a first connecting rod 22 and a second connecting rod 23. One end of the first connecting rod 22 is rotatably connected to the sliding member 21, and the other end of the first connecting rod 22 is rotatably connected to one end of the second connecting rod 23. The rod wall of the second connecting rod 23 is rotatably connected to the inner wall of the rear handle 2, and the thread cutting blade 25 is provided at the other end of the second connecting rod 23. That is, when the sliding member 21 moves forward, it pushes the first connecting rod 22 and the second connecting rod 23 to rotate and causes the thread cutting blade 25 to rotate toward the ligature 4; conversely, when not in use, the sliding member 21 is kept in its original position by the elastic member 24. At this time, the thread cutting blade 25 is away from the ligature 4, and the ligature will not be cut.

[0061] In one embodiment, a strip-shaped opening 26 is provided on the rear handle 2 , and an extension portion 211 is provided on the sliding member 21 . The extension portion 211 passes through the strip-shaped opening 26 and is exposed to the outside; the other end of the elastic member 24 is connected to the extension portion 211 .

[0062] In this embodiment, the length direction of the strip opening 26 is the sliding direction of the slider 21. The extension portion 211 is located behind the strip opening 26 and can limit the sliding path of the elastic member 24. On the one hand, it can limit the sliding stroke of the slider 21 to limit the maximum pulling force of the rear section component to ensure that there is no excessive pulling force; on the other hand, the extension portion 211 is exposed to the outside of the rear section handle 2, and the operating doctor can observe the changes in the sliding stroke from the outside, which can indirectly control the force value of the ligation process and avoid operational errors.

[0063] In one embodiment, in order to ensure that the wire cutting blade 25 can quickly cut the ligature 4 under a preset tension, a wire cutting seat 27 is provided in the rear section of the handle 2, the wire cutting blade 25 is opposite to the wire cutting seat 27, and the ligature 4 is placed on the wire cutting seat 27; the wire cutting seat 27 is provided with a V-shaped opening opposite to the wire cutting blade 25; when cutting the wire, the wire cutting blade 25 collides with the V-shaped opening, and the ligature 4 will receive a greater tension at the V-shaped opening, thereby achieving rapid cutting.

[0064] In some embodiments, the cutting blade 25 can be made of a hard ceramic blade with a hard and sharp edge, which can quickly complete the cutting process and avoid over-tightening the coil 41 and scratching the surface of the heart tissue.

[0065] In one embodiment, the catheter assembly includes a heat shrink tubing 5, a flexible catheter 6 and a connecting tube 7, one end of the flexible catheter 6 is connected to the front end of the front section handle 1, the heat shrink tubing 5 is covered at the connection between the flexible catheter 6 and the front end of the front section handle 1, one end of the connecting tube 7 is connected to the other end of the flexible catheter 6, and the other end of the connecting tube 7 is connected to the snare 3.

[0066] In this embodiment, the flexible catheter 6 uses a flexible tube body material, which has good resistance to creases, fractures and plastic deformation, can meet the application of various bending scenarios, and has obvious clinical efficiency; the connecting tube 7 uses metal parts, which provides sufficient strength at the front end to ensure that the coil 41 shrinks well.

[0067] In some embodiments, the snare 3 can be made of different diameters according to different needs; the snare 3 can be made of soft TPU material to protect cardiac tissue and avoid accidental injury; the internal bone position of the snare 3 can be made of nickel-titanium shape memory alloy wire to meet the needs of narrow or curved usage environments or channels.

[0068] In some embodiments, the snare 3 is a flexible ring with built-in dual channels. The dual channels can be arranged inside and outside, and the inner channel of the dual channels is used to embed the coil 41.

[0069] In some embodiments, to improve the image quality and avoid misoperation, a developing tungsten wire 31 can be embedded in the outer channel of the snare 3, and a developing coil spring 71 is provided in the connecting tube 7. The developing tungsten wire 31 and the developing coil spring 71 can be used to better position the snare 3 on the display module, thereby improving operability.

[0070] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present application, and such modifications or substitutions should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.

Claims

1. An automatic thread cutting and ligating device, characterized in that: include: A handle assembly, comprising a detachable front handle and a rear handle; A catheter assembly, one end of which is connected to the front section handle; a snare, arranged at the other end of the snare, the inner side of the snare being provided with a slit; A ligature thread runs through the front section handle and the catheter assembly, one end of the ligature thread is connected to the rear section handle, and the other end of the ligature thread is a coil that can be contracted in the forward direction and stopped in the reverse direction, and the coil is pre-installed in the snare; When the rear handle is separated from the front handle and pulled backward, the ligature is pulled backward, so that the coil is pulled out from the slit to the inside of the snare and contracts positively; Wherein, a thread cutting assembly is arranged in the rear section handle. When the rear section handle is separated from the front section handle and pulled back to reach a preset pulling force, the thread cutting assembly is driven to move and cut the ligature.

2. The automatic thread cutting and ligating device according to claim 1, characterized in that: The rear end of the front section handle is screw-connected with the front end of the rear section handle, and the rear section handle can be separated or screwed when rotating relative to the front section handle.

3. The automatic thread cutting and ligating device according to claim 1, characterized in that: The tangent assembly comprises: A sliding member is slidably mounted in the rear handle and can slide forward and backward, and one end of the ligature is connected to the sliding member; A connecting rod is installed in the rear handle, one end of the connecting rod is connected to the sliding member, and the other end of the connecting rod is provided with a cutting blade; An elastic member, one end of which is connected to the interior of the rear handle, and the other end of which is connected to the sliding member; When the rear handle is pulled backward, the ligature line drives the sliding member to slide forward and links the elastic member to stretch, and also links the connecting rod to rotate, so that the wire cutting blade moves toward the ligature line. When the elastic member is stretched to a preset tension, the wire cutting blade cuts the ligature line.

4. The automatic thread cutting and ligating device according to claim 3, characterized in that: The connecting rod member includes a first connecting rod and a second connecting rod, one end of the first connecting rod is rotatably connected to the sliding member, the other end of the first connecting rod is rotatably connected to one end of the second connecting rod, the rod wall of the second connecting rod is rotatably connected to the inner wall of the rear section handle, and the tangent blade is arranged at the other end of the second connecting rod.

5. The automatic thread cutting and ligating device according to claim 3, characterized in that: The rear handle is provided with a strip opening, the sliding member is provided with an extension portion, the extension portion passes through the strip opening and is exposed to the outside; the other end of the elastic member is connected to the extension portion.

6. The automatic thread cutting and ligating device according to claim 3, characterized in that: The elastic member is one of a coil spring and an elastic pull rope.

7. The automatic thread cutting and ligating device according to claim 3, characterized in that: A thread cutting seat is arranged in the rear section handle, the thread cutting blade is opposite to the thread cutting seat, the ligature wire is placed on the thread cutting seat; and a V-shaped opening opposite to the thread cutting blade is arranged on the thread cutting seat.

8. The automatic thread cutting and ligating device according to claim 1, characterized in that: The catheter assembly includes a heat shrink tube, a flexible catheter and a connecting tube, one end of the flexible catheter is connected to the front end of the front section handle, the heat shrink tube is covered at the connection between the flexible catheter and the front end of the front section handle, one end of the connecting tube is connected to the other end of the flexible catheter, and the other end of the connecting tube is connected to the snare.

9. The automatic thread cutting and ligating device according to claim 1, characterized in that: The internal bone position of the snare is nickel-titanium memory alloy wire.

10. The automatic thread cutting and ligating device according to claim 1, characterized in that: A developing tungsten wire is embedded in the snare, and a developing winding spring is arranged in the connecting tube.

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