Automatic suture cutter and ligator

Abstract

The present application provides an automatic suture cutter and ligator, which includes a front handle 1, a rear handle 2, a catheter assembly, a snare 3, and a ligature 4. One end of the catheter assembly is connected to the front handle 1, and the snare 3 is provided at the other end of the catheter assembly. A slit is provided inside the snare 3, and the 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 forward-threaded. The loop 41 is pre-attached to the snare 3, and a cutting suture assembly is provided in the rear handle 2. When the rear handle 2 is separated from the front handle 1 and pulled backward, the ligature 4 is driven to be pulled backward, and the loop 41 is interlocked and pulled out through the slit into the inside of the snare 3, contracting in the forward direction. At the same time, when the ligature 4 reaches a preset tension, the cutting suture assembly automatically cuts the ligature 4. The ligation operation is achieved by pulling the rear handle 2 backward, and during the operation, the cutting suture assembly automatically cuts the ligature at a preset node, which does not rely on the visual judgment or manual feel of the operating physician, thereby avoiding manual operation errors and mistakes.

Description

[Technical Field]

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS This application claims priority from a Chinese patent application bearing application number 202321699038.3, filed with the China Patent Office on June 30, 2023, the entire contents of which are incorporated herein by reference.

[0002] The present application relates to the technical field of medical devices, and more particularly to an automatic suture cutter and ligator. [Background technology]

[0003] left atrial appendage (left atrial appendage, LAA) The ductus ulceratus is a long, tubular blind cavity with an irregular shape and multiple bends, about the size of a thumb, and an opening measuring 10 to 40 mm. LAA Because there are abundant pectinate and trabecular muscles within the artery, the blood flow there tends to generate vortexes, the blood flow velocity tends to decrease, and it is a site where thrombi are likely to form.

[0004] Patients with atrial fibrillation (AF) are at significantly increased risk of stroke. Studies have shown: AF 60% of cardiogenic thrombi in patients with rheumatic heart disease LAA 91% of strokes are caused by non-valvular atrial fibrillation (AF) LAA It has been suggested that this is caused by blood clots in the LAA. Therefore, removing the LAA helps reduce the incidence of left atrial thrombus and stroke.

[0005] Current clinical treatment methods include oral anticoagulants, radiofrequency ablation, percutaneous left atrial appendage closure, and surgical left atrial appendage resection, but none of these methods have provided satisfactory clinical results.

[0006] Thus, left atrial appendage ligation was born, and correspondingly, compatible instruments were developed.

[0007] In the case of a conventional left atrial appendage ligation device, as disclosed in a Chinese patent application with application number 202110054297.X, a pre-tightened ligation loop is delivered to the designated surgical site using a mechanical delivery tool, and the operating physician manually pulls and tightens the loop to complete the ligation. This process relies on the operating physician's visual judgment and tactile sense to determine whether the ligation is complete or firm, which makes it prone to operational errors and mistakes. Summary of the Invention [Problem to be solved by the invention]

[0008] The purpose of this application is to provide an automatic suture cutting and ligating device, which aims to solve the problem that when performing ligation operations using existing left cardiac ear ligation instruments, the operating physician must rely on visual judgment and manual sensation, which makes it easy for operational mistakes and errors to occur. [Means for solving the problem]

[0009] In order to solve the above technical problems, the object is realized by the following technical solutions: To provide an automatic suture cutting and ligating device, the automatic suture cutting and ligating device comprises a handle assembly, a catheter assembly, a snare, 、 ligature and cutting thread assembly the handle assembly includes a detachable First Handle and Second Handle one end of the catheter assembly First Handle and the snare is connected to the Catheter Assembly The other end of the snare is provided with a slit inside the snare, and the ligature is First Handle and one end of the ligature passes through the catheter assembly. Second Handle The other end of the ligature is connected to a loop that can be contracted in the forward direction and stopped in the reverse direction. have , the loop is pre-mounted within the snare; the cutting suture assembly is disposed within the second handle; Here, the Second Handle The above First Handle Separated from and a direction away from the first handle to Towards Pulling the ligature A direction away from the first handle to Towards By driving the loop in a pulling manner, the loop is pulled out from the slit to the inside of the snare and contracted in the positive direction; before Note Second Handle but First Handle until a preset tension is reached. A direction away from the first handle to Towards When pulled, it moves the cutting assembly in unison, cutting the ligature.

[0010] moreover, adjacent to the second handle The aforementioned First Handle of one end of the second handle adjacent to the first handle; are connected by screwing, Second Handle The above First Handle When rotated with respect to Second Handle and the above First Handle can be separable or connectable.

[0011] Furthermore, the thread cutting assembly includes a slide member, a link member 、 Elastic member and thread cutting blade and the slide member includes the Second Handle Within and a direction toward the first handle and a direction away from the first handle. to Towards The link member is slidably attached, and one end of the ligature is connected to the slide member. Second Handle One end of the link member is connected to the slide member, and the other end of the link member is provided with a thread cutting blade. One end of the elastic member is connected to the slide member. Second Handle the other end of the elastic member is connected to the slide member, the thread cutting blade is provided at the other end of the link member away from the slide member, Here, the Second Handle but A direction away from the first handle to Towards When pulled, the ligature pulls the slide member. A direction toward the first handle to Towards The elastic member is moved and driven to extend and rotate the link member in conjunction with each other, whereby the thread cutting blade moves toward the ligature, and when the elastic member is extended to a preset tensile force, the thread cutting blade cuts the ligature.

[0012] Furthermore, the link member includes a first link rod and a second link rod, one end of the first link rod is rotatably connected to the slide member, the other end of the first link rod is rotatably connected to one end of the second link rod, and the rod of the second link rod arm is the above Second Handle The thread cutting blade is provided at the other end of the second link rod.

[0013] Furthermore, the above Second Handle is provided with a slit opening, where: The slide member is provided with an extension portion, the extension portion passing through the slit opening and Second handle outer wall The other end of the elastic member is connected to the extension portion.

[0014] Furthermore, the elastic member is either a coil spring or an elastic pull rope.

[0015] Furthermore, the above Second Handle A suture cutting seat is provided inside the suture cutting blade, the suture cutting blade is positioned opposite the suture cutting seat, the ligature is placed on the suture cutting seat, and the suture cutting seat is provided with a V-shaped groove corresponding to the suture cutting blade.

[0016] The catheter assembly further includes a heat shrink tube, a flexible catheter, and a connecting tube, and one end of the flexible catheter is away from the second handle The aforementioned First Handle of one end the flexible catheter is connected to away from the second handle The aforementioned First Handle of One end The connecting portion is covered with the heat shrinkable tube, 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.

[0017] Additionally, the internal framework of the snare is made of Nitinol shape memory alloy wire.

[0018] Furthermore, a tungsten wire for development is embedded inside the snare, and a development coil spring is provided inside the connection tube.

[0019] The automatic suture cutting and ligating device provided by this application is First Handle , Second Handle , a catheter assembly, a snare ligature, and one end of the catheter assembly First Handle The snare is connected to Catheter Assembly The other end of the snare is provided with a slit inside, and the ligature is First Handle and one end of the ligature passes through the catheter assembly. Second Handle The other end of the ligature is a loop that can be contracted in the forward direction and stopped in the reverse direction, and the loop is pre-installed in the snare, Second Handle is provided with a cutting thread assembly, Second Handle of First Handle When the ligature is separated from the slit and pulled backward, it drives the ligature backward, and the loop is pulled out of the slit and into the inside of the snare, contracting in the positive direction, and at the same time, when the ligature reaches a preset tension, the thread cutter assembly automatically cuts the ligature. Second Handle The ligation operation is achieved by pulling backward, and during the operation, the cutting line is automatically cut at a preset node by the cutting suture assembly, which does not rely on the operating physician's visual judgment or tactile sense, and avoids problems of manual operation errors and mistakes. [Brief explanation of the drawings]

[0020] In order to more clearly describe the technical solutions in the embodiments of the present application, the following briefly describes the drawings that need to be used in the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. Those skilled in the art can obtain other drawings from these drawings without any creative efforts. [Figure 1] 1 is a schematic diagram showing the structure of an automatic suture cutting and ligating device according to an embodiment of the present application. [Figure 2] 1 is a structural diagram showing a separated state of a handle assembly according to an embodiment of the present application; [Figure 3] FIG. 2 is a schematic diagram showing the internal structure of the rear handle according to an embodiment of the present application. [Figure 4] 1 is an exploded structural view of the distal end of an automatic suture cutting and ligating device according to an embodiment of the present application. DETAILED DESCRIPTION OF THE INVENTION

[0021] The following clearly and completely describes the technical solutions in the embodiments of the present application with reference to the drawings of the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, but are not all of the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative efforts belong to the protection scope of the present application.

[0022] As used in this specification and the appended claims, the terms "comprises" and "comprises" indicate the presence of stated features, wholes, steps, operations, elements, and / or components, but should be understood not to exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components, and / or combinations thereof.

[0023] It is also understood that the terminology used herein is used only for the purpose of describing particular embodiments and is not intended to limit the present application. As used in this specification and the appended claims, the singular forms "a," "one," and "the" are intended to include the plural forms unless the context clearly dictates otherwise.

[0024] It is to be further understood that the term "and / or" as 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.

[0025] 1 to 4, an embodiment of the present application provides an automatic suture cutter and ligator. The automatic suture cutter and ligator includes a handle assembly, a catheter assembly, a snare 3, and a ligature 4.

[0026] The handle assembly includes a separable front handle 1 and a rear handle 2. One end of the catheter assembly is before The other end of the catheter assembly is connected to a snare 3. A slit is provided inside the snare 3. The ligature 4 is before The handle 1 and catheter assembly are inserted through the Conclusion One end of the ligature 4 rear Part handle 2 is connected to Conclusion The other end of the ligature 4 is a loop 41 that can be contracted in the forward direction and stopped in the reverse direction. L Group 41 vinegar It is pre-installed inside the Nea 3.

[0027] rear Part handle 2 before When the handle is separated from the main handle 1 and pulled backward, Conclusion The ligature 4 is driven to pull backward, thereby L Group 41 is linked vinegar From Litt vinegar It is pulled inside Nea 3 and contracted in the positive direction.

[0028] rear A thread cutting assembly is provided in the main handle 2, rear Part handle 2 before When the external handle 1 is pulled back and separated from the external handle 1, a preset tension is reached. Cut The thread assembly moves in unison, Conclusion The ligature 4 is cut.

[0029] The operating procedure of this embodiment is as follows: One end of the snare 3 is delivered into the heart via the outer sheath tube, and the snare 3 is fitted around the left atrial appendage tissue inverted within the heart cavity. The rear handle 2 is then rotated to separate it from the front handle 1, and the rear handle 2 is then pulled backward, causing the loop 41 to be pulled out of the slit in the snare 3 and contract onto the tissue to be ligated. At the same time that the pulling force of the rear handle 2 completes ligation of the tissue, and when the pulling force reaches a preset pulling force, the cutting suture assembly moves in conjunction with the pulling force to cut the ligature 4, completing the automatic cutting after ligation.

[0030] As can be seen, in this embodiment, the tensile force required to complete ligation can be measured and the cutting node of the cutting suture assembly can be designed. For example, if the tensile force required to complete ligation is approximately 30 N, when the cutting suture assembly receives a tensile force of about 30 N, it will move to the position of the ligature 4, and the blade of the cutting suture assembly will come into contact with and cut the ligature 4. Therefore, by pulling the rear handle 2 backward, the ligation of the tissue can be completed and the ligature 4 can be cut at the same time. This process does not require relying on the visual judgment or tactile sense of the operating physician, which has the advantage of avoiding manual operation errors and mistakes.

[0031] It should be noted that the preset pulling force of 30N is selected based on the actual usage scenario, and this value can be adaptively adjusted according to various circumstances.

[0032] In one embodiment, before the rear end of the internal handle 1 rear The front end of the handle 2 is screwed together and connected. rear Part handle 2 before When the handle 1 is rotated, it can be separated or connected.

[0033] In this embodiment, 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 can be provided with a locking structure that engages with each other, and the front handle 1 and the rear handle 2 can be separated by rotating them relative to each other. This allows the front handle 1 and the rear handle 2 to be locked when not in use, and to be quickly opened when in use. When in use, the handles can be simply rotated and pulled out, making operation simple and convenient.

[0034] As shown in FIG. 3, in one embodiment, Cut The thread assembly includes a slide member 21, a link member, and an elastic member 24. The slide member 21 is rear The handle is installed in the main handle 2 and is slidable in the front-rear direction. Conclusion One end of the ligature 4 vinegar The link member is connected to the ride member 21. The link member is provided in the rear handle 2. R One end of the link member vinegar connected to the ride member 21, R The other end of the link member is provided with a thread cutting blade 25. One end of the elastic member 24 is rear The other end of the elastic member 24 is connected to the inside of the handle 2. vinegar It is connected to the ride member 21.

[0035] rear When the internal handle 2 is pulled backward, Conclusion Ligature 4 vinegar The ride member 21 is slid forward, and bullets The elastic member 24 is extended in conjunction with the elastic member 24, and R The link members are rotated in unison, Cut Thread braid 25 Conclusion Move towards ligature 4, bullets When the elastic member 24 is stretched to a preset tension, Cut Thread braid 25 Conclusion The ligature 4 is cut.

[0036] In this embodiment, the rear Handle 2At the same time that the ligature 4 is pulled backward, one end of the ligature 4 generates a forward pulling force on the slide member 21, which causes the slide member 21 to move forward. The forward movement of the slide member 21 pushes and rotates the link member, and the rotation of the link member rotates the thread cutting blade 25 toward the ligature 4. Therefore, when a preset pulling force is reached, the thread cutting blade 25 Conclusion The ligature 4 is cut.

[0037] In this embodiment, the elastic member 24 may be one of a coil spring, an elastic pull rope, or any other structure with spring back capabilities.

[0038] In this embodiment, the link member may include a first link rod 22 and a second link rod 23 . No. One end of the link rod 22 of 1 vinegar rotatably connected to the ride member 21; No. The other end of the link rod 22 of No. 1 is No. 2. The link rod 23 is rotatably connected to one end of the link rod 23. No. 2 link rods 23 rods arm teeth, rear The handle 2 is rotatably connected to the inner wall of the handle. Cut Thread Braid 25 No. The elastic member 24 is provided at the other end of the second link rod 23. That is, when the slide member 21 moves forward, the first link rod 22 and the second link rod 23 are pushed and rotated, and the thread cutting blade 25 rotates toward the ligature 4. Conversely, when the slide member 21 is not in use, the elastic member 24 maintains the slide member 21 in its original position, and at this time the thread cutting blade 25 is separated from the ligature 4, preventing the ligature from being cut.

[0039] In one embodiment, rear The handle 2 has a slit opening 26, and the slide member 21 has an extension 211. Nobu The extension 211 is vinegar The other end of the elastic member 24 is exposed to the outside through the lit opening 26. Nobu It is connected to the extension 211 .

[0040] In this embodiment, the longitudinal direction of the slit opening 26 coincides with the sliding direction of the sliding member 21, and the extension portion 211 is positioned within the slit opening 26, thereby restricting the sliding path of the elastic member 24. On the one hand, by restricting the travel distance of the sliding member 21, the maximum tensile force applied by the rear portion to the rear can be controlled, preventing excessive tensile force from being generated. On the other hand, because the extension portion 211 is exposed to the outside of the rear handle 2, the operating physician can visually observe changes in the sliding path from the outside, thereby indirectly controlling the magnitude of the force applied during the ligation operation and preventing operating errors.

[0041] In one embodiment, a suture cutting seat 27 is provided within rear handle 2 to allow suture cutting blade 25 to quickly cut ligature 4 with a preset tension. Cut Thread Braid 25 Cut Opposite to the thread seat 27, Conclusion Ligature 4 Cut It is placed in the thread seat 27. Cut The thread seat 27 has Cut A V-shaped groove corresponding to the thread blade 25 is provided, and when the ligature 4 is cut, the thread cutting blade 25 comes into contact with the V-shaped groove, so that the ligature 4 is subjected to a large tension, thereby realizing rapid cutting.

[0042] In some embodiments, the cutting blade 25 may be a hard ceramic blade. The cutting edge is hard and sharp, allowing for a quick cutting process. This prevents damage to the surface of the cardiac tissue caused by excessive pulling on the loop 41.

[0043] In one embodiment, mosquito The catheter assembly includes a heat shrink tube 5, centre The flexible catheter 6 and the connecting tube 7 are connected to one end of the flexible catheter 6. before The handle is connected to the front end of the centre The connection between the flexible catheter 6 and the front end of the front handle 1 is heat It is covered with a shrink tube 5. contact One end of the connecting tube 7 centre connected to the other end of the flexible catheter 6, contact The other end of the connecting tube 7 vinegar It is connected to Nea 3.

[0044] In this embodiment, the flexible catheter 6 is made of a flexible material, which has excellent resistance to breakage, rupture, and plastic deformation, and can be used in various bending scenarios, thereby improving clinical efficiency, and the connecting tube 7 is made of a metal material, which provides sufficient strength to the tip and ensures good contraction of the loop 41.

[0045] In some embodiments, vinegar The Snare 3 is available in different diameters depending on the intended use. The entire Snare 3 is made of flexible TPU material to protect the myocardial tissue and prevent accidental injury. The internal framework of the Snare 3 can be made of Nitinol shape memory alloy wire, which can meet the needs of narrow or curved environments and passageways.

[0046] In some embodiments, the snare 3 is a flexible loop incorporating a double channel, the double channel being arranged inside and outside, the inner channel of the double channel being used to embed the loop 41 .

[0047] In some embodiments, to achieve a good image development effect and prevent operational errors, a tungsten wire 31 for development is embedded in the outer channel of the snare 3, and a coil spring 71 for development is provided in the connecting tube 7. The tungsten wire 31 for development and the coil spring 71 for development allow the position of the snare 3 to be accurately determined on the display module, improving operability.

[0048] The above are merely specific embodiments of the present application and do not limit the patent scope of the present application. Any modifications, equivalent replacements, etc. that are easily conceivable to those skilled in the art within the technical scope disclosed in this specification should be included in the patent protection scope of the present application. Therefore, the protection scope of the present application should be governed by the claims. [Explanation of symbols]

[0049] 1 Front Handle 2 rear handles 21 Slide member 211 Extension section 22 First link rod 23 Second link rod 24 Elastic member 25 Thread cutting blade 26 Slit opening 27 Cutting seat 3 Snare 31 Developed tungsten wire 4 ligatures 41 Loop 5 Heat-shrink tubing 6 Flexible catheter 7 Connecting tube 71 Developing coil spring

Claims

1. An automatic suture cutting and ligating device including a handle assembly, a catheter assembly, a snare, and a ligature, the handle assembly includes separable front and rear handles; one end of the catheter assembly is connected to the front handle; The snare is provided at the other end of the snare, and a slit is provided on the inside of the snare; the ligature passes through the front handle and the catheter assembly, one end of the ligature is connected to the rear handle, and the other end of the ligature is a loop that can be contracted in a forward direction and stopped in a reverse direction, the loop being pre-attached within the snare; When the rear handle is separated from the front handle and pulled rearward, the ligature is pulled rearward, and the loop is pulled out from the slit to the inside of the snare and contracted in the positive direction. a suture cutting assembly is provided in the rear handle, and when the rear handle is separated from the front handle and pulled rearward until a preset tension is reached, the suture cutting assembly is moved in conjunction with the rear handle to cut the ligature.

2. 2. The automatic suture cutting and ligating instrument according to claim 1, wherein the rear end of the front handle and the front end of the rear handle are connected by threading, and the rear handle and the front handle can be separated or connected by rotating the rear handle relative to the front handle.

3. the cutting thread assembly includes a slide member, a link member, and an elastic member; the slide member is attached to the rear handle so as to be slidable in the front-rear direction, and one end of the ligature is connected to the slide member; The link member is provided in the rear handle, one end of the link member is connected to the slide member, and the other end of the link member is provided with a thread cutting blade; One end of the elastic member is connected to the rear handle, and the other end of the elastic member is connected to the slide member; 2. The automatic suture cutting and ligating instrument according to claim 1, wherein when the rear handle is pulled rearward, the ligature moves and drives the slide member forward, thereby stretching the elastic member in conjunction with the slide member and rotating the link member in conjunction with the slide member, thereby moving the thread cutting blade toward the ligature, and when the elastic member is stretched to a preset tensile force, the thread cutting blade cuts the ligature.

4. 4. The automatic suture cutting and ligating instrument according to claim 3, wherein the link member includes a first link rod and a second link rod, one end of the first link rod is rotatably connected to the slide member, the other end of the first link rod is rotatably connected to one end of the second link rod, a rod wall of the second link rod is rotatably connected to an inner wall of the rear handle, and the suture cutting blade is provided at the other end of the second link rod.

5. 4. The automatic suture cutting and ligating instrument according to claim 3, wherein the rear handle is provided with a slit opening, the slide member is provided with an extension portion, the extension portion passes through the slit opening and is exposed to the outside, and the other end of the elastic member is connected to the extension portion.

6. 4. The automatic suture cutting and ligating device according to claim 3, wherein the elastic member is one of a coil spring and an elastic pull rope.

7. 4. The automatic suture cutting and ligating device according to claim 3, wherein a suture cutting seat is provided within the rear handle, the suture cutting blade is disposed opposite the suture cutting seat, the ligature is disposed on the suture cutting seat, and the suture cutting seat is provided with a V-shaped groove corresponding to the suture cutting blade.

8. 2. The automatic suture cutting and ligating instrument according to claim 1, wherein 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 handle, a connecting portion of the flexible catheter and the front handle is covered with the heat shrink tube, 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. 2. The automatic suture cutting and ligating instrument according to claim 1, wherein the internal framework of the snare is made of nitinol shape memory alloy wire.

10. 2. The automatic suture cutting and ligating instrument according to claim 1, wherein a developing tungsten wire is embedded inside the snare, and a developing coil spring is provided inside the connecting tube.

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