Fistula snare and method of use thereof

Abstract

The present invention relates to a disposable medical device for treating fistula diseases, inflammatory diseases, and functional diseases in anorectal medicine, specifically a fistula snare and a method for using the device, comprising a handle and a rubber ring guide head. One end of the handle is configured as an open structure, and a push rod is slidably connected to the handle. The push rod is a hollow structure with both ends open. One end of the push rod is configured as a ligation portion. The ligation portion extends out of the open end of the handle or is retracted into the handle by sliding the push rod. The rubber ring guide head is detachably connected to the ligation portion of the push rod. When the ligation portion extends out of the open end of the handle, the rubber ring guide head is connected to the ligation portion of the push rod. When the ligation portion is retracted into the handle, the rubber ring guide head is separated from the ligation portion of the push rod. The present invention ligates an elastic line through the combination of the rubber ring guide head and the push rod, thereby improving the efficiency of rubber ring application and reducing the instrument operation time during surgery. This fills the gap in disposable special instruments in the field of puncture and thread hanging for anorectal diseases.

Description

Technical Field

[0001] The present invention relates to a disposable medical device for treating fistula diseases, inflammatory diseases and functional diseases in anorectal department, in particular to a fistula snare and a use method thereof. Background Art

[0002] Anorectal disease refers to a general term encompassing conditions affecting the anus, rectum, and colon. With improvements in living standards and changes in dietary habits, the incidence of anorectal diseases has been increasing, making them common and frequently occurring illnesses in daily life. The popular Chinese saying, "Nine out of ten people suffer from hemorrhoids," illustrates their prevalence. Anorectal diseases affect both men and women, adults and infants. Epidemiological data show that the incidence of anorectal disease in adults is approximately 60-75%, with a higher incidence in rural adults than in urban areas. While rarely life-threatening, severe cases often disrupt normal work and daily life, and even mild cases can result in periodic pain. For some infants, anorectal disease not only impacts their development and growth but also places a significant burden on their parents. The diagnosis and treatment of anorectal diseases are gaining increasing attention among the general public.

[0003] Thread hanging therapy is one of the most commonly used treatments in anorectal medicine (TCM). Widely used since the Ming Dynasty, it is simple, convenient, effective, and inexpensive, making it widely used in clinical practice. In recent years, its application has continued to expand, and research has deepened. It has since held a prominent position in TCM anorectal treatment and has continued to develop. The mechanisms of traditional thread hanging therapy are well understood, and it is generally believed to have four main functions: chronic strangulation, foreign body stimulation, drainage, and marking. As a classic TCM external treatment, thread hanging is widely used in clinical practice. With the development of modern medicine, thread hanging is commonly used for anal fistulas, perianal abscesses, anorectal stenosis, chronic anal fissures, outlet obstructive constipation, and Crohn's disease fistulas. For high-positioned, complex anal fistulas and perianal abscesses, timely thread hanging maintains unobstructed drainage, which not only helps control the condition but also prevents premature healing of the ducts. It also minimizes damage to the perianal skin and subcutaneous tissue, preserving anal function to the greatest extent possible. In the chronic inflammatory stage of high-positioned anal fistulas, string hanging is often used. Due to the chronic incision, the internal opening of the fistula is opened, which can both cure the disease and protect anal function. The key to treating perianal abscesses and fistulas in infants and young children lies in maintaining unobstructed drainage, managing the internal opening, removing the source of infection, and protecting anal function. Generally, perianal abscesses and fistulas in infants and young children are often low-positioned. Studies have shown that direct excision of low-positioned, superficial fistulas is safe, but due to the immature development of the sphincter, direct excision should be avoided whenever possible. For fistulas with complex tracts or high internal openings, low-position incision and high string hanging are used. String hanging can enlarge the internal opening, ensure unobstructed drainage, promote the growth of fresh granulation tissue, accelerate recovery, and significantly shorten treatment time. When string hanging is used to treat anal fissures, the tension of the string is typically used to gradually sever portions of the internal sphincter and the pectinate band, relieving internal sphincter spasm and allowing the fissure to heal. Using this method for cutting can avoid a series of sequelae such as anal deformation and incontinence caused by excessive sphincter cutting; for the treatment of benign or iatrogenic anorectal stenosis, the hanging thread therapy has the advantages of slow cutting, cutting while lengthening, compression hemostasis, protection of anal function, and simple operation; for outlet obstruction constipation caused by hypertrophy and spasm of the puborectalis muscle, the hanging thread is cut through the puborectalis muscle, and the chronic tightening effect of the hanging thread is relied on to cause the tissue hung by the hanging thread to gradually necrotize and peel due to ischemia, thus avoiding the adverse consequences of incision infection, sudden muscle disconnection, weakened anal canal self-control ability, and even anal incontinence caused by partial resection or cutting of the puborectalis muscle.

[0004] Currently, traditional probes are used clinically to perform hanging-wire therapy. Their tips are spherical to facilitate exploration and avoid the appearance of a false lumen due to their sharp tip. However, chronic inflammation can sometimes lead to severe fibrosis in the duct, preventing smooth passage of the spherical probe. Furthermore, after probing the duct's internal opening, a rubber band or multiple strands of silk must be connected to the spherical tip with silk thread. This can easily become dislodged when the rubber band or multiple strands of silk are pulled out of the duct due to muscle contraction or luminal stenosis, leading to repeated punctures and explorations, increasing the difficulty and time of the procedure. Some physicians also use vascular forceps to manually dilate the wound and remove the rubber band. This surgical technique is violent and can cause significant tissue damage and intraoperative bleeding. A search of published Chinese patents has revealed three new approaches to probe inventions: 1. A looped, wire-like structure is incorporated into one end of the probe to facilitate the insertion of a hanging-wire. However, a common problem is that the wire structure is a secondary addition, which increases the diameter of the probe and undoubtedly causes secondary expansion of the inserted tissue, leading to complications such as bleeding. 2. The probe is designed as a hollow tube structure or a telescopic structure to facilitate fistula staining and tissue depth measurement. However, this design structure is complex, and the production process requirements and costs are high. In actual clinical work, we have found that many anal fistula lumens are narrow, making it impossible to inject markers such as methylene blue. Many diseases such as perianal abscesses, anal fissures, anorectal stenosis, and puborectalis muscle spasms do not have internal openings. The actual application significance is not great and is not conducive to clinical operation. In clinical trials, we found that due to the complex structure and hidden blind spots, the instrument is prone to cross-infection risks during repeated disinfection. 3. Some probe designs use polymer medical materials such as plastic silicone or use different materials for connection in sections. However, in actual clinical practice, we found that this polymer material or segmented design does not have the excellent hardness and flexibility characteristics, and its application value is not great. All of the above designs have an unresolved problem: adjusting the tightness of the hanging wire after it is fixed. Furthermore, the multiple tightening operations are tedious and painful for patients. For many years, anorectal departments have used repeatedly sterilized instruments for this type of treatment. Therefore, there is a clinical need for a disposable, professional hanging wire medical device with good puncture performance, hanging wire stability, ease of operation, adjustable hanging wire force, and switchable virtual and real hanging wires. This device fills the gap in the lack of disposable dedicated instruments in this field of anorectal diseases. Summary of the Invention

[0005] In view of the defects of the above-mentioned existing technologies, the purpose of this product is to provide a disposable fistula snare for the treatment of fistula diseases, inflammatory diseases and functional diseases in the anorectal department. This snare integrates all hanging wire tools, making the puncture process faster and safer, and realizing the simultaneous puncture and hanging wire, making the operation process more efficient.

[0006] To achieve the above-mentioned purpose, the technical solution adopted by this product is: a fistula snare, including a handle and a rubber ring guide head, one end of the handle is set as an open structure, and a push rod is slidably connected to the handle, and the push rod is a hollow structure with both ends open. One end of the push rod is set as a ligation part, and the ligation part is extended out of the open end of the handle or retracted into the handle by sliding the push rod. The rubber ring guide head is detachably connected to the ligation part of the push rod. When the ligation part extends out of the open end of the handle, the rubber ring guide head is connected to the ligation part of the push rod. When the ligation part is retracted into the handle, the rubber ring guide head is separated from the ligation part of the push rod.

[0007] Furthermore, the push rod is configured as a cylindrical structure for assisting the rubber ring ligation, with a diameter of 9 mm and a longitudinal diameter of 10 cm. The ligation portion has an outer diameter of 1.2 cm and a length of 2 cm.

[0008] Furthermore, the rubber ring guide head is coaxially arranged with the push rod; the rubber ring guide head is axially inserted into the ligature portion of the push rod.

[0009] Furthermore, the rubber ring guide head is a hollow structure and is made of ABS material that complies with GB / T12672-2009.

[0010] Furthermore, the rubber ring guide is configured as a conical structure for assisting in fitting the rubber ring.

[0011] Furthermore, the conical structure includes a cone head and a cone shank. The cone head is disposed at the end of the rubber ring guide. The cone head has a greater taper than the cone shank, and the outer diameter gradually increases from the cone head end to the cone shank end. The cone shank end is inserted into the ligature portion of the push rod. The cone head end has a diameter of approximately 0.3-0.5 mm, which facilitates insertion into the rubber ring.

[0012] Furthermore, the rubber ring guide head is provided with a window hole for connecting with the push rod ligation part, the window hole on the rubber ring guide head is axially plugged into the ligation part, the outer diameter of the ligation part is smaller than the outer diameter of the window hole part of the rubber ring guide head, and the outer diameter of the window hole part and the outer diameter of the ligation part are in a stepped transition.

[0013] Furthermore, the window hole has a horizontal diameter of 8-10 mm and a vertical diameter of 4-5 mm.

[0014] Furthermore, the handle and the rubber ring guide are both hollow structures, a track for the push rod to slide is provided in the handle, the track is a cylindrical structure, and the outer diameter of the push rod is smaller than the inner diameter of the track.

[0015] Furthermore, the handle comprises a first shell and a second shell which are split along the axial direction, wherein the first shell and the second shell are connected in a mortise and tenon manner. The handle is made of ABS material which complies with GB / T12672-2009.

[0016] Furthermore, a guide groove for pushing the push handle is provided on the handle, and the push handle is slidably arranged in the guide groove. The push handle is connected to the push rod and drives the push rod to slide in the handle.

[0017] Furthermore, the longitudinal diameter of the guide groove is 25 mm and the diameter is 5 mm. The push handle is set 5 cm away from the ligation end of the push rod, is T-shaped, 1 cm long and 2.5 mm wide.

[0018] Furthermore, the guide groove is provided at the joint of the first shell and the second shell.

[0019] Furthermore, an end cap is detachably connected to one end of the handle away from the ligation portion of the push rod, and a through hole is provided on the end cap to ensure that the handle and the interior of the push rod are not contaminated, and the through hole is used to place or insert a puncture needle.

[0020] Furthermore, the handle has a tapered structure at one end near the ligation portion, with a longitudinal diameter of 98.97 mm. Furthermore, a wave-shaped gripping groove is provided on the outer surface of the handle for better gripping, allowing the puncture doctor to hold the device more stably.

[0021] Furthermore, the fistula snare also includes a puncture needle and a rubber ring. A needle is provided at one end of the needle body of the puncture needle, and an elastic line is connected to the other end. The elastic line is connected to the puncture needle in a weaving manner. The elastic line is connected to the handle, and the length of the puncture needle is greater than the length of the handle; the rubber ring is an annular structure, and the rubber ring is mounted on the rubber ring guide through the central opening. The rubber ring slides along the rubber ring guide to the ligation part of the push rod. When the ligation part is retracted into the handle, the rubber ring is detached from the ligation part and mounted on the elastic line to ligate the elastic line.

[0022] Furthermore, the needle body of the puncture needle is a bendable solid circular tube with a diameter of about 1.2 mm and is made of 306 stainless steel. It has good antibacterial properties and flexibility, and better ensures the puncture strength of the puncture needle body.

[0023] Furthermore, one end of the puncture needle is a blunt teardrop-shaped tip, and the other end is wrapped with nylon thread and connected to the elastic thread. The blunt teardrop-shaped tip ensures strong penetration in tough tissues while providing maximum protection for the finger guiding the rectum.

[0024] Furthermore, the blunt, teardrop-shaped needle tip has a transverse diameter of approximately 1.4-1.5mm; the needle body has a diameter of 1.2mm and is approximately 18cm long. This consistent diameter minimizes tissue damage during the puncture process. The 18cm needle length provides a more stable grip for the physician.

[0025] Furthermore, the elastic wire has a diameter of 1.5±0.3 mm and a length of 50 cm; it reduces the cutting area of ​​the separated tissue while ensuring effective cutting.

[0026] Furthermore, the elastic line includes an inner core and an outer layer wrapping the inner core, the inner core is a natural rubber band, the outer layer is woven and wrapped around the needle body of the puncture needle, connecting the elastic line to the puncture needle; the outer layer is a nylon line.

[0027] Furthermore, the rubber ring is made of natural rubber and has a central hole, forming a doughnut-like structure. The outer diameter of the rubber ring is approximately 5.5±2.75mm, and the central hole is approximately 1mm. This ensures effective fixation of the elastic cord while reducing the foreign body irritation caused by traditional fixing wires. By replacing traditional silk threads with rubber rings to secure the elastic cord, the tightness of the elastic cord can be adjusted at any time according to the patient's condition, allowing for flexible operation of both virtual and solid hanging wires.

[0028] Furthermore, the elastic line includes an inner core and an outer layer wrapping the inner core, the inner core is a natural rubber band, the outer layer is woven and wrapped around the needle body of the puncture needle, connecting the elastic line to the puncture needle; the outer layer is a nylon line.

[0029] The fistula snare also includes a booster to assist in fitting the rubber ring. The booster has a claw-shaped, hollow structure at its front end. The booster is inserted from the end of the rubber ring guide into the outer wall of the guide, pushing the rubber ring from the guide to the ligation portion of the push rod. The booster is made of ABS material that complies with GB / T12672-2009.

[0030] Furthermore, the fistula snare also includes a silicone gasket, which is provided with at least two threading holes for passing the elastic line, which are respectively located at both ends of the silicone gasket, and the rubber ring ties the silicone gasket inside.

[0031] Furthermore, the silicone gasket has specifications of 33±0.8mm in length, 10.7±0.2mm in width, 2mm in thickness, a threading hole diameter of 2.5±0.05mm, and a spacing of 7.2±0.15mm between the two holes. Biomechanical analysis has found that in this method, the pressure at the proximal end of the tissue is much greater than the pressure at the distal end. When the rubber band is contracted, a directional force is generated on the sphincter from the proximal end to the distal end, thereby achieving a directional cutting effect that prioritizes the cutting and growth of the proximal sphincter tissue. This conforms to the principle of directional cutting, can reduce the risk of anal incontinence, and avoid the formation of keyhole deformities after surgery.

[0032] Furthermore, the silicone gasket is a strip-shaped structure with blunt ends, and the outer wall of the silicone gasket has a smooth transition.

[0033] Furthermore, the fistula snare also includes a latex drainage tube, and the elastic thread passes through the latex drainage tube to ligate the latex drainage tube inside the body. Using the elastic thread instead of silk thread to suture and fix the latex drainage tube can reduce the pain caused by suture fixation.

[0034] Furthermore, the latex drainage tube is made of soft silicone material, has a diameter of 5 mm and a length of 10 cm, and can fully drain the infected and corrupted tissues in the deep wound cavity.

[0035] Furthermore, the push rod is a hollow structure made of ABS material that complies with GB / T12672-2009. The hollow structure houses the puncture needle, elastic cord, silicone gasket, and / or latex drainage tube, achieving device integration and simplifying the traditional puncture and line hanging operation process.

[0036] Furthermore, the fistula snare is classified as a fistula snare type A or a fistula snare type B.

[0037] Furthermore, the fistula snare type A includes a handle, a rubber ring guide, a puncture needle, an elastic wire and a silicone gasket. The puncture needle, elastic wire and silicone gasket are placed in the push rod. The puncture needle is connected to a single elastic wire, and the single elastic wire is connected to the tail end of the handle. The single elastic wire passes through the threading hole at one end of the silicone gasket.

[0038] Furthermore, the fistula snare type B includes a handle, a rubber ring guide head, a puncture needle, an elastic wire, a silicone gasket and a latex drainage tube. The puncture needle, elastic wire and silicone gasket are placed in the push rod. The puncture needle is connected to two elastic wires, and the two elastic wires are both connected to the handle. One elastic wire passes through the threading hole at one end of the silicone gasket, and the other elastic wire is used to pass through the latex drainage tube.

[0039] The method of using the fistula snare is as follows: when using, push the push handle to push the ligation part of the push rod out from the handle, insert the rubber ring guide head on the ligation part of the push rod, push the rubber ring on the rubber ring guide head from the rubber ring guide head to the ligation part of the push rod, remove the rubber ring guide head, lead the elastic wire in the push rod from the ligation part through the puncture needle, and the puncture needle passes through the tissue in the rectum and is led out from the rectum with a certain curvature. Introduce the puncture needle and elastic wire from the ligation part into the push rod, push the push handle, and push the ligation part of the push rod into the handle. The rubber ring of the ligation part falls off and is put on the elastic wire. Cut the elastic wire, pull the two ends of the elastic wire to push the rubber ring to the tissue, and maintain a certain tension.

[0040] Furthermore, when the puncture needle is connected to a single elastic wire, the single elastic wire ligates the latex gasket inside the body through a rubber ring. In the initial state, the single elastic wire at the tail of the puncture needle passes through the threading hole at one end of the silicone gasket, and the single elastic wire is fixed on the handle. When in use, the puncture needle passes through the tissue in the rectum and is led out from the rectum with a certain curvature. After passing through the threading hole at the other end of the silicone gasket, the puncture needle and the elastic wire are introduced from the ligation part into the push rod, and the elastic wire is cut after ligation through the rubber ring.

[0041] Furthermore, when the puncture needle is connected to the double elastic lines, one elastic line ligates the latex gasket inside the body through the rubber ring, and the other elastic line ligates the latex drainage tube inside the body.

[0042] Furthermore, when the puncture needle is connected to two elastic lines, and a silicone gasket and a latex drainage tube are pre-installed in the push rod, in the initial state, one elastic line at the tail of the puncture needle passes through the threading hole at one end of the silicone gasket, and the other elastic line at the tail of the puncture needle passes through the latex drainage tube. Both elastic lines are fixed at the tail end of the handle. When in use, the puncture needle passes through the tissue in the rectum and is led out from the rectum with a certain curvature. First, the two ends of the elastic line connected to the latex drainage tube are cut off, and the two ends of the elastic line are knotted, and the latex drainage tube is fixed in the body. Then, the puncture needle is passed through the threading hole at the other end of the silicone gasket, and the puncture needle and the elastic line are introduced into the push rod from the ligation part. The elastic line connected to the silicone gasket is ligated with a rubber ring and then the elastic line is cut off.

[0043] Furthermore, when the puncture needle is connected to the double elastic wire, in the initial state, one elastic wire at the tail of the puncture needle passes through the threading hole at one end of the silicone gasket and is connected to the tail end of the handle. When in use, the puncture needle passes through the tissue in the rectum and is led out from the rectum with a certain curvature. First, a latex drainage tube of appropriate length is trimmed according to the depth of the pre-drainage tissue, and then the unfixed elastic wire is passed through the latex drainage tube, and the latex drainage tube is placed in the pre-drainage tissue. Then, the connection between the unfixed elastic wire and the puncture needle is cut, and the two ends of the elastic wire are knotted to fix the latex drainage tube in the body. Then, the puncture needle is passed through the threading hole at the other end of the silicone gasket and the puncture needle and the elastic wire are introduced into the push rod from the ligation part. The elastic wire connected to the silicone gasket is ligated through the rubber ring and then the elastic wire is cut.

[0044] Furthermore, the rubber ring on the rubber ring guide head is pushed from the rubber ring guide head to the ligation portion of the push rod by the booster.

[0045] The present invention has the following beneficial effects: Compared to existing technologies, the snare of the present invention, through its combined structure of a rubber ring guide and a push rod, allows for convenient and rapid ligation of elastic cords. Clinicians can adjust the tension of the elastic cord according to the patient's pain level and medical condition after surgery, improving the efficiency of rubber ring application while significantly reducing instrument manipulation time during surgery. The snare of the present invention is a disposable product, safe and convenient, filling the gap in the field of disposable, dedicated instruments for puncture and ligation of anorectal diseases. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 Schematic diagram of the puncture needle structure;

[0047] Figure 2 Schematic diagram of the rubber ring structure;

[0048] Figure 3 This is a schematic diagram of the booster structure;

[0049] Figure 4 This is a schematic diagram of the rubber ring guide structure;

[0050] Figure 5 This is a schematic diagram of the first shell structure of the handle;

[0051] Figure 6 This is a schematic diagram of the second shell structure of the handle;

[0052] Figure 7 This is a schematic diagram of the push rod installation;

[0053] Figure 8 This is a schematic diagram of the push rod and handle combination;

[0054] Figure 9 This is a schematic diagram of the rubber ring guide head, push rod, and handle assembly;

[0055] Figure 10 Predetermined marking diagram for the putter;

[0056] Figure 11 Schematic diagram of inserting a rubber ring into a disposable fistula snare;

[0057] Figure 12 Schematic diagram of silicone gasket;

[0058] Figure 13 This is a schematic diagram of the application of the disposable fistula cutter type A;

[0059] Figure 14 Schematic diagram of the application of the disposable fistula cutter type A of Example 1 in human tissue;

[0060] Figure 15 This is a schematic diagram of the latex drainage tube;

[0061] Figure 16 Schematic diagram of the application of the disposable fistula cutter type B of Example 2 in human tissue.

[0062] Figure: 1. Puncture needle body, 2. Needle, 3. Connection between puncture needle and elastic cord, 4. Elastic cord outer layer, 5. Elastic cord inner core, 6. Rubber ring, 7. Central hole of rubber ring, 8. Rubber ring guide, 9. Window hole of rubber ring guide, 10. Push rod, 11. Push handle, 12. Handle, 12.1 First housing, 12.2 Second housing, 13. Handle guide groove, 14. Marking position for pre-insertion of rubber ring, 15. Silicone gasket, 16. Threading hole, 17. Latex drainage tube, 18. Booster;

[0063] a, cone head, b, cone handle, c, ligature, d, track;

[0064] A. Perineum, B. Rectum, C. Anus. DETAILED DESCRIPTION

[0065] The following will describe in detail various embodiments of the present invention in conjunction with the accompanying drawings to provide a clearer understanding of the objectives, features and advantages of the present invention. It should be understood that the embodiments shown in the accompanying drawings are not intended to limit the scope of the present invention, but are only intended to illustrate the essential spirit of the technical solution of the present invention.

[0066] In the following description, certain specific details are set forth for the purpose of illustrating the various disclosed embodiments to provide a thorough understanding of the various disclosed embodiments. It should be understood that these embodiments are intended only to illustrate the present invention and are not intended to limit the scope of the present invention. Furthermore, it should be understood that after reading the contents described herein, persons skilled in the art may make various changes or modifications to the present invention, and that such equivalents are also within the scope of the claims appended hereto.

[0067] Example 1

[0068] See attached Figure 1-11, a puncture needle, elastic line, rubber ring 6 for hanging line ligation and a disposable fistula snare for auxiliary ligation, including a handle 12 and a rubber ring guide head 8, one end of the handle 12 is set to an open structure, and a push rod 10 is slidably connected to the handle 12, and the push rod 10 is a hollow structure with open ends. One end of the push rod 10 is set to a ligation part c, and the ligation part c is extended out of the open end of the handle 12 or retracted into the handle 12 by sliding the push rod 10. When the ligation part c extends out of the open end of the handle 12, the rubber ring guide head 8 is detachably connected to the ligation part c of the push rod. When the ligation part c is retracted into the handle 12, the rubber ring guide head 8 is separated from the ligation part c of the push rod. A needle head 2 is provided at one end of the needle body 1 of the puncture needle, and an elastic line is connected to the other end. The elastic line is connected to the puncture needle in a woven manner, and the end of the elastic line is connected to the tail end of the handle 12. The length of the puncture needle is greater than the length of the handle 12, which is convenient for controlling the puncture needle to be led out from the handle 12; the rubber ring is an annular structure, and the rubber ring is sleeved on the rubber ring guide head through the central opening. The rubber ring slides along the rubber ring guide head to the ligation part of the push rod. When the ligation part is retracted into the handle, the rubber ring is separated from the ligation part and sleeved on the elastic line to ligate the elastic line.

[0069] The puncture needle body 1 is a bendable solid circular tube. One end of the needle body 1 is a blunt teardrop-shaped needle head 2, and the other end is an integrally woven elastic cord. The rubber ring 6 is a rubber ring with a hole in the center. The rubber ring 6 is fitted onto the elastic cord through the central hole 7 and ligates the elastic cord. The rubber ring guide head 8 is a hollow cone with a window hole at the tail end. The rubber ring 6 is fitted onto the rubber ring guide head to assist in fitting the rubber ring 6. The push rod 10 is a hollow cylinder with a push handle. The rubber ring 6 is fitted onto the ligation portion of the push rod to assist in ligation. The rubber ring guide head is coaxial with the push rod; the rubber ring guide head 8 is axially inserted into the ligation portion c of the push rod. The handle 12 is a hollow combination structure of a truncated cone and a cylinder with a guide groove 13. The push rod 10 is wrapped in the handle 12 and slides in the inner cavity of the handle 12. This product's puncture needle can be bent to adapt to the path of an anorectal fistula or infected tissue gap. The blunt tip prevents the formation of a false channel during exploration and puncture. A braided elastic cord at the other end allows for simultaneous insertion into the tissue during puncture. A rubber ring 6 has a central hole that secures the needle by pushing a push rod 10 onto the elastic cord, allowing for adjustment of tension based on patient needs. The rubber ring guide 8 has a window 9 at its rear end, which connects to the push rod's ligation section (c) and facilitates insertion of the rubber ring 6. The push rod 10 also has a ligation section (c) at its tip, which connects to the window 9 of the rubber ring guide 8. The ligation section (c) and window 9 form a stepped transition. A sliding push handle 11 allows the rubber ring 6 to be released onto the elastic cord for ligation. The handle contains the puncture needle, elastic cord, and push rod 10, ensuring a better grip and simplifying the procedure. The device has a reasonable and simple structure, is easy to operate and manufacture, and uses inexpensive materials. It fills the gap of disposable medical consumables in this field and is easy to promote clinically.

[0070] In one embodiment, an end cap is detachably connected to the end of the handle away from the ligation portion of the push rod, and a through hole is provided on the end cap to protect the handle and the interior of the push rod from contamination, and the through hole is used to place or insert the puncture needle.

[0071] In one embodiment, the needle body 1 of the puncture needle is a bendable solid circular tube with a diameter of about 1.2 mm and is made of 316 stainless steel. It has good antibacterial properties and flexibility, and better ensures the puncture strength of the puncture needle body.

[0072] In one embodiment, the puncture needle body 1 has a blunt, teardrop-shaped tip 2 at one end, and the other end is wrapped with nylon thread and connected to an elastic cord. The blunt, teardrop-shaped tip 2 ensures penetration through tough tissue while providing maximum protection for the guiding finger in the rectum.

[0073] In one embodiment, the blunt, teardrop-shaped needle tip has a transverse diameter of approximately 1.4-1.5 mm; the needle body has a diameter of 1.2 mm and is approximately 18 cm long. This diameter is essentially the same as the needle body diameter, minimizing tissue damage during the puncture. The 18 cm needle length provides a more stable grip for the physician.

[0074] In one embodiment, the elastic wire has a diameter of about 1.5±0.3 mm and a length of about 50 cm, thereby ensuring effective cutting while reducing the cutting area of ​​the tissue.

[0075] In one embodiment, the elastic line includes an inner core 5 and an outer layer 4 that wraps the inner core. The inner core 5 of the elastic line is a natural rubber band. The nylon line wrapped around the puncture needle body 1 forms the outer layer 4 of the elastic line. The outer layer 4 of the elastic line is integrated with the nylon line of the puncture needle connection part.

[0076] In one embodiment, the rubber ring 6 is made of natural rubber with a central hole, forming a doughnut-like structure. The outer diameter of the rubber ring 6 is approximately 5.5±2.75 mm, and the central hole 7 is approximately 1 mm. This ensures effective elastic thread fixation while reducing the foreign body irritation associated with traditional fixation threads. Using a rubber ring instead of traditional silk thread to secure the elastic thread allows for flexible adjustment of the elastic thread's tightness based on the patient's condition, enabling flexible manipulation of both virtual and solid thread fixation.

[0077] In one embodiment, a window hole is provided at 1.5 cm from the tail end of the rubber ring guide head 8, with a horizontal diameter of 8-10 mm and a vertical diameter of 4-5 mm for connecting with the ligature portion on the push rod.

[0078] In one embodiment, the rubber ring guide 8 is configured as a conical structure for fitting the rubber ring 6, and the window hole on the rubber ring guide 8 is connected to the ligation part c along the axial direction. The outer diameter of the ligation part c is smaller than the outer diameter of the part of the rubber ring guide where the window hole 9 is set.

[0079] In one embodiment, the conical structure includes a cone head a and a cone shank b. Cone head a is positioned at the end of the rubber ring guide 8. The cone head a has a greater taper than the cone shank b, and the outer diameter gradually increases from the tip of cone head a to the tail of cone shank b. The diameter of cone head a is approximately 0.3-0.5 mm, making it easier to insert the rubber ring.

[0080] In one embodiment, the rubber ring guide 8 is a hollow structure and is made of ABS material that complies with GB / T12672-2009.

[0081] In one embodiment, the push rod 10 is configured as a cylindrical structure for assisting in the ligation of the rubber ring 6, with a diameter of approximately 9 mm and a longitudinal diameter of approximately 10 mm. A ligation portion c is provided at one end of the cylindrical structure, with an outer diameter of approximately 1.2 cm and a length of approximately 2 cm. A window 9 is provided at the tail end of the tapered handle b and connects to the ligation portion c, with the outer diameter of the window portion transitioning to the outer diameter of the ligation portion in a stepped manner.

[0082] In one embodiment, the push rod 10 is provided with a push handle 11 about 5 cm from its leftmost end. The push handle 11 is T-shaped, about 1 cm long and about 2.5 mm wide, and is used to push the push rod 10 so that the rubber ring 6 is put onto the elastic line and tied. Figure 8 In the aforementioned orientation, before use, the push handle 11 should be located at the leftmost end of the guide slot 13 on the handle 12. That is, the ligating portion c should be pushed out of the handle 10 and connected to the window hole 9 of the rubber ring guide 8. The ligating portion c and the handle 12 are connected at the marked position 14 where the rubber ring 6 is pre-inserted into the ligating portion c. That is, before use, the rubber ring 6 should be located at the marked position 14, which is located at the end of the ligating portion c. During use, the rubber ring guide 8 is removed, the ends of the elastic cord are inserted through the ligating portion c into the push rod 10, and the push handle 11 is pushed to the rightmost end of the handle guide slot 13. The rubber ring 6 will fall off the marked position 14, and the ends of the elastic cord will be constrained within the central hole 7 of the rubber ring 6.

[0083] In one embodiment, a puncture needle and an elastic line are placed in the push rod 10, which facilitates the operation process of traditional puncture and hanging line.

[0084] In one embodiment, the handle 12 is provided with a guide groove 13 for sliding the push handle 11. The guide groove 13 has a longitudinal diameter of approximately 25 mm and a diameter of approximately 5 mm. A track d is provided within the handle 12 for sliding the push rod 10. The track d is a cylindrical structure, and the outer diameter of the push rod 10 is smaller than the inner diameter of the track d.

[0085] In one embodiment, the handle 12 is axially symmetrically divided into a first shell and a second shell. The first and second shells are joined by a mortise and tenon joint, and the guide groove 13 is symmetrically located at the top center joint of the first and second shells. The handle 12 is a combination of a frustum and a cylinder, with a longitudinal diameter of approximately 98.97 mm. A wavy gripping groove is provided at the bottom to better fit the fingers and provide a more stable grip for the puncture physician.

[0086] The method of using this embodiment is as follows: Figure 8As shown in the center direction, before use, the push rod 10 contains a puncture needle and elastic cord. The end of the elastic cord is connected to the rear end of the handle 12. During surgery, the push handle is pushed to the leftmost end of the handle guide slot, pushing the ligature out of the handle. The rubber ring guide is then inserted through the rubber ring guide into the predetermined marked position on the push rod ligature. The rubber ring guide is removed, and the disposable puncture needle is pulled out of the handle. The puncture needle is inserted through the external opening of the fistula tract or tissue incision, gently probing the puncture needle along the tract or pre-incised area. Once the needle is inserted into the rectum, the guide finger is used to guide the needle out of the rectum with a certain curvature, immediately bringing the elastic cord into the tissue. After passing through the anus, the puncture needle and elastic cord are introduced into the handle, and the push handle is pushed to the rightmost end of the guide groove of the handle, that is, the ligature is pushed into the handle. Then the rubber ring falls off onto the elastic cord, the elastic cord is cut, and the two ends of the elastic cord are pulled to push the rubber ring to the tissue, and maintain appropriate tension. After the operation, the clinician can adjust the tension of the elastic cord at will according to the patient's pain level and condition. The muscle tissue is chronically incised with the tension of the elastic cord, and the broken ends of the muscles on both sides are not completely severed due to inflammatory fibrosis. Because the diameter of the elastic cord is only 1.5±0.3mm, while curing the disease, it minimizes tissue damage and better protects the function of the anal tissue.

[0087] Compared to existing technologies, the snare of the present invention, through its combined structure of a rubber ring guide and a push rod, allows for quick and convenient ligation of the elastic cord. Clinicians can adjust the tension of the elastic cord according to the patient's pain level and condition after surgery. The silicone gasket controls the cutting direction, reducing sphincter damage and thus avoiding postoperative keyhole deformity. The combination of the elastic cord and latex drainage tube reduces postoperative pain and avoids adverse conditions such as localized tissue hematoma. The snare improves the efficiency of rubber ring application while significantly reducing instrument manipulation time during surgery. This device fills the gap in the field of disposable, dedicated instruments for puncture and ligation of anorectal diseases.

[0088] Example 2

[0089] See attached Figure 1-14 Fistula snare type A: The technical solution of Example 2 is essentially the same as that of Example 1, except that it also includes a silicone gasket 15. The silicone gasket 15 has four threading holes 16 for passing elastic cords, located at either end of the silicone gasket 15. The rubber ring 6 ties the silicone gasket 15 within. Placing the silicone gasket 15 below the tissue where the cord is drawn widens the base, redirecting the force of the cord when tightened, and reducing the effect on the base.

[0090] Based on the above technical solution, the fistula snare type A includes a puncture needle, an elastic line, a push rod, a handle, a silicone gasket, and a booster. The puncture needle is connected to a single elastic line, which is connected to the tail end of the handle. The single elastic line passes through the threading hole at one end of the silicone gasket. The two threading holes 16 facilitate the elastic line to pass through and fix the silicone gasket 15. The other two threading holes 16 are set at different positions of the silicone gasket 15. The elastic line can be selectively connected to the threading holes 16 at different positions to facilitate the silicone gasket 15 to fit the pre-cut tissue. Figure 10 Two threading holes 16 are provided at each end of the silicone gasket 15 to facilitate passage of an elastic cord and adherence to the pre-cut tissue. In the initial state of the fistula snare Type A, the single elastic cord at the end of the puncture needle passes through the threading hole at one end of the silicone gasket. The single elastic cord is secured within the end of the handle. During use, the puncture needle penetrates the tissue within the rectum and is then guided out of the rectum with a certain curvature. After passing through the threading hole at the other end of the silicone gasket, the puncture needle and elastic cord are then introduced from the ligation portion into the push rod. After ligation is performed using the rubber ring, the elastic cord is cut.

[0091] In one embodiment, the silicone gasket has a length of 33±0.8mm, a width of 10.7±0.2mm, a thickness of 2mm, a threading hole diameter of 2.5±0.05mm, and a spacing of 7.2±0.15mm between the two holes. Biomechanical analysis has found that in this method, the pressure at the proximal end of the tissue is much greater than the pressure at the distal end. When the rubber band is contracted, a directional force is generated on the sphincter from the proximal end to the distal end, thereby achieving a directional cutting effect that preferentially cuts and grows the proximal sphincter tissue. This conforms to the principle of directional cutting, can reduce the risk of anal incontinence, and avoid the formation of keyhole deformities after surgery.

[0092] In one embodiment, the silicone gasket is a strip-shaped structure with rounded ends, and the outer wall of the silicone gasket has a smooth transition.

[0093] In one embodiment, a booster 18 is included to assist in the assembly of the rubber ring. The booster is a claw-shaped hollow structure at the front end and is made of ABS material that complies with GB / T12672-2009. The booster is inserted from the end of the rubber ring guide into the outer wall of the rubber ring guide, pushing the rubber ring from the rubber ring guide to the ligature portion of the push rod.

[0094] The method of use of this embodiment is as follows: Before use, the push rod 10 contains a puncture needle, elastic cord, and silicone gasket 15. The elastic cord is threaded through two threading holes 16 at one end of the silicone gasket 15 and then connected to the rear end of the handle 12. During surgery, the push handle 12 is pushed to the leftmost end of the handle guide slot 13, thereby pushing the ligature c out of the handle 12. The rubber ring guide window 9 is then connected to the ligature c. The pusher 18 is used to insert the rubber ring through the rubber ring guide 8 into the predetermined marked position of the push rod ligature c. The rubber ring guide 8 is removed, and the disposable puncture needle and silicone gasket 15 are pulled out of the handle. The puncture needle is then inserted through the external opening of the fistula tract or tissue incision, gently probing the tract or pre-incision site. Once the puncture needle is inserted into the rectum, the guide finger is used to guide the needle out of the rectum with a certain curvature, thereby bringing the elastic cord into the tissue. When passing through the anus, pass the puncture needle through the two threading holes 16 at the other end of the silicone gasket 15, and bring the silicone gasket 15 into the distal end of the pre-cut tissue. Introduce the puncture needle and the elastic wire into the handle 12, push the push handle to the rightmost end of the handle guide groove 13, and then push the ligation part into the handle. Then the rubber ring falls off onto the elastic wire, cut the elastic wire, pull the two ends of the elastic wire to push the rubber ring to the tissue, and maintain appropriate tension. After the operation, the clinician can adjust the tension of the elastic wire at will according to the patient's pain level and condition. The muscle tissue is chronically cut open with the tension of the elastic wire, and the broken ends of the muscles on both sides are not completely severed due to inflammatory fibrosis. Because the diameter of the elastic wire is only 1.5±0.3mm, while curing the disease, the damage to the tissue is minimized, and the function of the anal tissue is better protected.

[0095] Example 3

[0096] See attached Figure 1-16 , Fistula snare type B, the technical solution of Example 3, the fistula snare type B is basically the same as the fistula snare of Example 1, except that it also includes a silicone gasket 15 and a latex drainage tube 17, and a puncture needle, an elastic line, a silicone gasket and a latex drainage tube 17 are placed in the push rod of the fistula snare type B. The puncture needle is connected to a double elastic line, one elastic line passes through a threading hole of the silicone gasket, and the other elastic line passes through the latex drainage tube. The ends of the double elastic lines are both connected to the tail end of the handle.

[0097] The silicone gasket 15 is provided with four threading holes 16 for passing the elastic thread, one at each end of the silicone gasket 15. The rubber ring 6 ties the silicone gasket 15 inward. Placing the silicone gasket 15 below the tissue where the thread is hung widens the base, changing the direction of the thread's cutting force when tightening the thread, thereby reducing the cutting effect on the base.

[0098] Based on the above technical solution, the fistula snare type B includes a puncture needle, an elastic line, a push rod, a handle, a silicone gasket, a booster and a latex drainage tube. The puncture needle is connected to a double elastic line, and one elastic line passes through the threading hole at one end of the silicone gasket and is connected to the tail end of the handle. The two threading holes 16 facilitate the elastic line to pass through and fix the silicone gasket 15. The other two threading holes 16 are set at different positions of the silicone gasket 15. The elastic line can be selectively connected to the threading holes 16 at different positions to facilitate the silicone gasket 15 to fit the pre-cut tissue. Figure 10 As mentioned above, two threading holes 16 are respectively provided at both ends of the silicone gasket 15 to facilitate the passage of elastic wires and to adhere the silicone gasket to the pre-cut tissue.

[0099] In one embodiment, the silicone gasket has a length of 33±0.8mm, a width of 10.7±0.2mm, a thickness of 2mm, a threading hole diameter of 2.5±0.05mm, and a spacing of 7.2±0.15mm between the two holes. Biomechanical analysis has found that in this method, the pressure at the proximal end of the tissue is much greater than the pressure at the distal end. When the rubber band is contracted, a directional force is generated on the sphincter from the proximal end to the distal end, thereby achieving a directional cutting effect that preferentially cuts and grows the proximal sphincter tissue. This conforms to the principle of directional cutting, can reduce the risk of anal incontinence, and avoid the formation of keyhole deformities after surgery.

[0100] In one embodiment, the silicone gasket is a strip-shaped structure with rounded ends, and the outer wall of the silicone gasket has a smooth transition.

[0101] The elastic thread passes through the latex drainage tube 17, and the elastic thread ligates the latex drainage tube 17 in the body. Using elastic thread instead of silk thread to suture and fix the latex drainage tube 17 can reduce the pain caused by suturing and fixation. The latex drainage tube 17 is made of soft silicone material, with a diameter of about 5 mm and a length of about 10 cm. The latex drainage tube can be bent at will to adapt to the direction of the anorectal fistula or the infected tissue gap, and adhere to the pre-drainage tissue. It can fully drain the infection and corrupt tissue in the deep wound cavity.

[0102] In one embodiment, a booster 18 is included to assist in the assembly of the rubber ring. The booster is a claw-shaped hollow structure at the front end and is made of ABS material that complies with GB / T12672-2009. The booster is inserted from the end of the rubber ring guide into the outer wall of the rubber ring guide, pushing the rubber ring from the rubber ring guide to the ligature portion of the push rod.

[0103] The method of use of this embodiment is as follows: Before use, the push rod 10 contains a puncture needle, elastic cord, silicone gasket 15, and latex drainage tube 17. The puncture needle is connected to two elastic cords, one elastic cord passing through a threading hole in the silicone gasket 15, and the other elastic cord passing through the latex drainage tube 17. The ends of the two elastic cords are both connected to the tail end of the handle. During surgery, the push handle 11 is pushed to the leftmost end of the handle guide groove 13, thereby pushing the ligature portion c out of the handle 12 and splicing the rubber ring guide window with the ligature portion. The booster 18 is used to pass the rubber ring 6 through the rubber ring guide 8 and into the predetermined mark 14 on the push rod ligature portion. The rubber ring guide 8 is removed, and the disposable puncture needle, silicone gasket 15, and latex drainage tube 17 are pulled out of the handle 12. The puncture needle is inserted through the external opening of the fistula tract or tissue incision, and the puncture needle is gently inserted along the direction of the tract or into the pre-incised area. After entering the rectum, under the protection of the guiding finger, the puncture needle is guided out of the rectum with a certain curvature, and the elastic cord is then brought into the tissue, and the latex drainage tube 17 is placed in the pre-drained tissue. When the puncture needle passes out of the anus, the ends of the elastic cord connected to the latex drainage tube 17 are first cut and tied into a knot. The latex drainage tube 17 is then fixed in the body. The puncture needle is then passed through the threading hole at the other end of the silicone gasket 15, and the silicone gasket 15 is brought into the distal end of the pre-cut tissue. The puncture needle and the elastic cord connected to the latex gasket 15 are introduced into the handle, and the push handle is pushed to the rightmost end of the handle guide groove 13, that is, the ligation portion C is pushed into the handle 12. The rubber ring 6 is then removed and placed on the elastic cord. The elastic cord is cut, and the ends of the elastic cord are pulled to push the rubber ring 6 into the tissue, maintaining appropriate tension. The rubber ring ligates the silicone gasket 15 internally. Postoperatively, clinicians can adjust the tension of the elastic cord according to the patient's pain level and medical condition. The tension of the elastic cord chronically incises the muscle tissue, preventing complete severance of the muscle ends due to inflammatory fibrosis. Because the elastic cord's diameter is only 1.5±0.3mm, while radically curing the disease, it minimizes tissue damage and better protects the function of the anal tissue. The latex drainage tube's drainage function fully drains the infection and corrupted tissue deep within the wound cavity, ultimately curing the disease.

[0104] In one embodiment, the fistula snare type B includes a puncture needle, an elastic wire, a push rod, a handle, a silicone gasket, a booster and a latex drainage tube. The puncture needle is connected to two elastic wires, one of which passes through the threading hole at one end of the silicone gasket and is connected to the tail end of the handle, and the other elastic wire is freely set. In the initial state, an elastic wire at the tail of the puncture needle passes through the threading hole at one end of the silicone gasket and is fixed in the tail end of the handle. When in use, the puncture needle passes through the tissue in the rectum and is led out from the rectum with a certain curvature. First, a latex drainage tube of appropriate length is trimmed according to the depth of the pre-drainage tissue, and then the unfixed elastic wire is passed through the latex drainage tube, and the latex drainage tube is placed in the pre-drainage tissue. Then, the connection between the unfixed elastic wire and the puncture needle is cut, and the two ends of the elastic wire are knotted to fix the latex drainage tube in the body. Then, the puncture needle is passed through the threading hole at the other end of the silicone gasket and the puncture needle and elastic wire are introduced into the push rod from the ligation part. The elastic wire connected to the silicone gasket is ligated with a rubber ring and then the elastic wire is cut. The procedure is as follows: Before use, the push rod 10 contains a puncture needle, elastic cord, and silicone gasket 15. The puncture needle is connected to a double-strand elastic cord, one of which is threaded through two threading holes at one end of the silicone gasket 15 and then connected to the rear end of the handle 12. During surgery, the push handle 11 is pushed to the leftmost end of the handle guide slot 13, thereby pushing the ligature c out of the handle 12 and joining the rubber ring guide window with the ligature. Using the booster 18, the rubber ring 6 is threaded through the rubber ring guide 8 and into the predetermined marking 14 on the push rod ligature. The rubber ring guide 8 is removed, and the disposable puncture needle and silicone gasket 15 are pulled out of the handle 12. The puncture needle is then inserted through the external opening of the fistula tract or through a tissue incision, gently probing the tract or pre-incision site. Once the needle is inserted into the rectum, the guiding finger is used to guide the needle out of the rectum with a certain curvature, thereby bringing the elastic cord into the tissue. According to the depth of the pre-drainage tissue, the latex drainage tube is trimmed to a suitable length, and then the unfixed elastic line is passed through the latex drainage tube and placed in the pre-drainage tissue. The connection between the unfixed elastic line and the puncture needle is then cut, and the latex drainage tube 17 is placed in the pre-drainage tissue. The two ends of the elastic line are tied together to fix the latex drainage tube 17 in the body. The puncture needle is then passed through the threading hole at the other end of the silicone gasket 15 and the silicone gasket 15 is brought into the distal end of the pre-cut tissue. The puncture needle and the elastic line connected to the latex gasket 15 are introduced into the handle, and the push handle is pushed to the rightmost end of the handle guide groove 13, that is, the ligation part C is pushed into the handle 12. Then the rubber ring 6 falls off and is put on the elastic line. The elastic line is cut, and the two ends of the elastic line are pulled to push the rubber ring 6 to the tissue and maintain appropriate tension. The rubber ring ligates the silicone gasket 15 inside. After surgery, clinicians can adjust the tension of the elastic thread at will according to the patient's pain level and condition.The muscle tissue is chronically incised using the tension of the elastic cord. Due to the formation of inflammatory fibrosis, the muscle ends on both sides are not completely severed. Because the elastic cord diameter is only 1.5±0.3mm, while the disease is radically cured, tissue damage is minimized to the greatest extent, better protecting the function of the anal tissue. The drainage function of the latex drainage tube fully drains the infection and corrupted tissue in the deep wound cavity, thus radically curing the disease.

[0105] It should be noted that the parts not described in detail in the present invention are prior art.

[0106] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0107] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0108] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediate medium; internal communication between two components, or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0109] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0110] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only implementation methods.

[0111] The above examples are merely preferred embodiments of the present invention. Obviously, the present invention is not limited to the above examples, and many variations are possible. All variations that can be directly derived or imagined by a person skilled in the art from the disclosure of the present invention should be considered to be within the scope of protection of the present invention.

Claims

1. A fistula snare, characterized by: The invention comprises a handle and a rubber ring guide head, one end of the handle is set as an open structure, a push rod is slidably connected in the handle, the push rod is a hollow structure with two open ends, one end of the push rod is set as a ligation part, the ligation part is extended out of the open end of the handle or retracted into the handle by sliding the push rod, the rubber ring guide head is detachably connected to the ligation part of the push rod, when the ligation part extends out of the open end of the handle, the rubber ring guide head is connected to the ligation part of the push rod, when the ligation part is retracted into the handle, the rubber ring guide head is separated from the ligation part of the push rod; the rubber ring guide head is coaxially arranged with the push rod; the rubber ring guide head is axially inserted into the ligation part of the push rod; the rubber ring guide head is set as a conical structure for assisting the set of the rubber ring; the rubber ring guide head is provided with a useful The window hole of the ligation part of the push rod is connected, and the window hole on the rubber ring guide head is plugged into the ligation part along the axial direction. The outer diameter of the ligation part is smaller than the outer diameter of the window hole part of the rubber ring guide head, and the outer diameter of the window hole part and the outer diameter of the ligation part are stepped into a transition; it also includes a puncture needle and a rubber ring, a needle head is provided at one end of the needle body of the puncture needle, and the other end is connected to the elastic line, the elastic line is connected to the puncture needle in a weaving manner, and the elastic line is connected to the handle, and the length of the puncture needle is greater than the length of the handle; the rubber ring is an annular structure, and the rubber ring is sleeved on the rubber ring guide head through the central opening, and the rubber ring slides along the rubber ring guide head to the ligation part of the push rod. When the ligation part is retracted into the handle, the rubber ring is separated from the ligation part and sleeved on the elastic line to ligate the elastic line.

2. The fistula snare according to claim 1, characterized in that: The conical structure includes a cone head and a cone handle. The cone head is arranged at the end of the rubber ring guide head. The taper of the cone head is greater than the taper of the cone handle. The outer diameter gradually increases from the cone head end to the cone handle tail end; the cone handle tail end is inserted into the ligation part of the push rod.

3. The fistula snare according to claim 1, characterized in that: The handle and the rubber ring guide are both hollow structures, and a track for the push rod to slide is provided in the handle. The track is a cylindrical structure, and the outer diameter of the push rod is smaller than the inner diameter of the track; the handle includes a first shell and a second shell split along the axial direction, and the first shell and the second shell are spliced ​​in a mortise and tenon manner; a guide groove for pushing the push handle is provided on the handle, and the push handle is slidably arranged in the guide groove, and the push handle is connected to the push rod and drives the push rod to slide in the handle; the guide groove is provided at the joint of the first shell and the second shell; the end of the handle away from the ligating part of the push rod is detachably connected to an end cover, and a through hole is provided on the end cover; a wavy gripping groove for gripping is provided on the outer surface of the handle.

4. The fistula snare according to claim 1, characterized in that: It also includes a booster for assisting the rubber ring set, which is configured as a cavity structure with a claw-shaped front end. The booster is inserted into the outer wall of the rubber ring guide head from the end of the rubber ring guide head to push the rubber ring on the rubber ring guide head from the rubber ring guide head to the ligation part of the push rod.

5. The fistula snare according to claim 1, characterized in that: It also includes a silicone gasket, which is provided with at least two threading holes for passing the elastic line, which are located at both ends of the silicone gasket; the silicone gasket is a strip structure with blunt ends, and the outer wall of the silicone gasket has a smooth transition.

6. The fistula snare according to claim 5, characterized in that: The device also comprises a latex drainage tube, the elastic line passes through the latex drainage tube, and the elastic line ties the latex drainage tube inside the body.

7. The fistula snare according to any one of claims 1 to 5, characterized in that: It also includes a fistula snare type A; the fistula snare type A includes a handle, a rubber ring guide, a puncture needle, an elastic wire and a silicone gasket, the puncture needle, elastic wire and silicone gasket are placed in the push rod, the puncture needle is connected to a single elastic wire, the single elastic wire is connected to the tail end of the handle, and the single elastic wire passes through the threading hole at one end of the silicone gasket.

8. The fistula snare according to any one of claims 1 to 6, characterized in that: It also includes a fistula snare type B; the fistula snare type B includes a handle, a rubber ring guide, a puncture needle, an elastic wire, a silicone gasket and a latex drainage tube, the puncture needle, elastic wire and silicone gasket are placed in the push rod, the puncture needle is connected to two elastic wires, and the two elastic wires are both connected to the handle, one elastic wire passes through the threading hole at one end of the silicone gasket, and the other elastic wire is used to pass through the latex drainage tube.

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