Ligation anastomat

Abstract

The utility model relates to a loop ligature anastomat which comprises a gun body shell, a multifunctional assembly and a push ring assembly. The multifunctional assembly comprises a mode switching assembly with only one mode switching tube, the mode switching assembly is constructed to be capable of conducting mode switching between a negative pressure suction mode and a traction mode, the two ends of the mode switching tube are open, and at least one window is formed in the tube body, close to the end portion of one end, of the mode switching tube. The window and the opening of the tube body adjacent to the end part of one end form a channel for traction operation; the loop pushing assembly at least comprises a loop ligature loop and a loop pushing mechanism provided with a loop pushing ring, the loop pushing ring is movably arranged on the outer wall of the mode switching pipe in a sleeving mode, and the loop pushing mechanism is constructed to be capable of being driven to move the loop pushing ring in the axis direction of the mode switching pipe. And the loop ligature ring is pushed out of the end part of the tube body through the loop pushing ring so as to be ligated on the pathological tissue. The loop ligature anastomat integrates the working experience of tens of years and is updated for three times, the loop ligature mode conversion is simpler, and the surgical operation is more convenient and faster.

Description

Technical Field

[0001] The utility model relates to the field of medical instruments, in particular to an anorectal ligation stapler. Background Art

[0002] Hemorrhoid band ligation refers to a surgical method of band ligating a certain amount of mucosa and submucosal tissue above the hemorrhoids, or directly band ligating the base of the hemorrhoids to cut off the blood supply to the hemorrhoids and cause them to shrink, thereby eliminating the hemorrhoids. In the band ligation treatment of anorectal internal hemorrhoids, the commonly used band ligation devices can be divided into two types, one is a negative pressure suction band ligation device, and the other is a traction band ligation device.

[0003] In actual surgical operations, it is usually necessary to select different ligation devices according to the size, location, and smoothness of the surface (forming a closed negative pressure) of the pathological tissue. However, existing ligation devices usually only have a single ligation mode (negative pressure suction or traction), which needs to be disinfected and sterilized after one use and is inconvenient for continuous use. In addition, when it is necessary to implement different ligation methods, at least two ligation devices are required, which invisibly increases the surgical consumables and the economic burden on the surgical patients. Therefore, the following dual-purpose ligation devices have been improved in the prior art:

[0004] Chinese utility model patent CN2748038Y discloses a disposable dual-purpose ligation device, which is composed of a sleeve, a main pipe and a piston element, wherein the sleeve and the main pipe are combined to form a working space for ligation, and each of them includes a circular tube portion and a longitudinal strip portion uniformly distributed along the circumferential direction. When a traction-type ligation device is required, the main pipe is installed in the sleeve in the "same direction" of the structure; when a negative pressure suction ligation device is required, the main pipe is installed in the sleeve in the "reverse direction" of the structure, and then the piston element is installed in the main pipe. Although the ligation device realizes a set of tools with two functions, it has a large number of pipe fittings, and when used, it is necessary to disassemble and assemble these multiple pipe fittings into different combinations, which requires the cooperation of multiple people.

[0005] On the basis of this patent, Chinese utility model patent CN202489995U discloses a dual-purpose hemorrhoid ligation forceps, which is installed with a handle and a wrench on the main pipe, and the wrench is connected by a connecting rod on the sleeve to drive the sleeve to realize the push ring. Thus, when performing negative pressure suction ligation, only one person needs to pull the core tube with one hand to generate negative pressure and attract the hemorrhoidal tissue, and the other hand holds the handle and pulls the wrench to push the rubber ring out. However, since the push ring assembly is a closed sleeve, although it can complete the push ring function, it increases the cross-sectional area of ​​the barrel part, making it almost equal to the cross-sectional area of ​​the anoscope window of the operation, and obviously blocks the field of vision. In addition, since the main pipe is fixed by the handle, the mode cannot be switched by reversing assembly in this scheme. Therefore, when performing traction ligation, it is necessary to directly pass the long surgical forceps through the main pipe to clamp and pull the hemorrhoidal tissue, and then push the rubber ring out of the ligation. Although this technology greatly simplifies the switching operation between different modes (only need to pull out / insert the inner core or long surgical forceps), the inner diameter of the main tube is very narrow (usually 5-8mm) and its depth is relatively long (usually 150-170mm), which makes the traction band ligation operation limited to special auxiliary instruments, such as long traction forceps that need to be purchased separately. The long traction forceps purchased separately are metal components and need to be disinfected and sterilized after one use. They have the disadvantage of not being able to be used in conjunction with other disposable components. In addition, because the traction point of the long traction forceps is too far away, it is not convenient to apply force, and the traction is not tight, which increases the difficulty of traction band ligation (especially for traction band ligation of anorectal internal hemorrhoids). Utility Model Content

[0006] In view of the above problems, the utility model provides a ligation stapler, which is particularly suitable for the ligation of pathological internal hemorrhoids, colon polyps, or lengthy mucosal tissues in the anorectal department. It is not only convenient for switching between the negative pressure traction mode and the pulling mode, but also convenient for surgical operations in different modes. It has a simple structure and is flexible and convenient to use. Furthermore, the ligation stapler can also improve the success rate of ligation in the prior art, significantly reduce the number of cases due to premature detachment of the rubber ring, and ensure the treatment effect. Furthermore, the ligation stapler can also select the negative pressure suction mode according to the needs of the disease and the doctor's habitual application, thereby further improving its flexibility of use, and is particularly suitable for the case of disposable components.

[0007] In the utility model, the ligation stapler comprises a gun body shell, a multifunctional component, and a push ring component;

[0008] The gun body shell includes a gun body connecting portion, a handle portion, and a driving component configured to drive both the multifunctional component and the push ring component, wherein the driving component is accommodated in an accommodating cavity formed by the gun body connecting portion and the handle portion;

[0009] The multifunctional component comprises a mode switching component and a negative pressure element configured to generate negative pressure in the mode switching component, wherein the mode switching component is configured to switch between a negative pressure suction mode and a pulling mode, wherein the mode switching component comprises only one mode switching tube, the mode switching tube is open at both ends and is connected to the gun body housing through the gun body connecting portion, at least one window is opened on the tube body adjacent to one end of the mode switching tube, and the window and the tube body opening adjacent to one end form a pulling channel for pulling operation;

[0010] The push ring assembly at least includes a ligation ring and a push ring mechanism provided with a push ring ring, the ligation ring can be movably mounted on the end of the tube body of the mode switching tube, the push ring ring can be movably mounted on the outer wall of the mode switching tube, and the push ring mechanism is constructed to be able to be driven to move the push ring ring in the axial direction along the mode switching tube, and to push the ligation ring out of the end of the tube body through the push ring ring, so that the ligation ring is ligated on the pathological tissue to be ligated after being detached from the end of the tube body.

[0011] According to the present invention, "anastomosis" refers to the process of tying a ligature loop on the pathological tissue to be ligated, so that the tissue is gradually severed at the ligature, and the ends of the tissue at the base are annularly matched (i.e., anastomosed) and the wound is gradually repaired.

[0012] According to the utility model, the window is one or more openings provided on the tube body of the mode switching tube adjacent to one end thereof and extending along the axial direction of the tube body, and is used to form a channel with the tube body opening adjacent to one end to perform a pulling operation. When multiple windows are provided, preferably, the multiple windows are evenly arranged in the circumferential direction of the tube body. In a preferred embodiment according to the utility model, the arc length of the one window along the circumferential direction or the total arc length of the multiple windows along the circumferential direction is not greater than 1 / 2 of the circumferential length of the tube body.

[0013] In some embodiments according to the utility model, the mode switching tube can be a hollow tube body with two ends open, including a pulling mode part and a negative pressure suction mode part, wherein the tube body part at one end provided with the window and configured for pulling operation is the pulling mode part, and the tube body part at the other end away from the window and configured for negative pressure operation is the negative pressure suction mode part. Both the pulling mode part and the negative pressure suction mode part can be detachably fixed to the gun body connecting part in the form of shape matching or structural matching. That is to say, when it is necessary to switch the mode, if one end of the pulling mode part is connected to the gun body connecting part, so that the negative pressure suction mode part is set at the front of the ligation stapler, it is the negative pressure suction mode of the ligation stapler; if one end of the negative pressure suction mode part is connected to the gun body connecting part, so that the pulling mode part is set at the front of the ligation stapler, it is the pulling mode of the ligation stapler.

[0014] In some other embodiments of the present invention, the mode switching tube can also be a hollow tube body with two ends open and provided with a sealing element, and the sealing element is configured to match the window and seal or unseal it to achieve switching between the negative pressure suction mode and the pulling mode. The mode switching tube can be integrally formed with the gun body connection portion; or, the mode switching tube also includes a tube connection portion provided at the other end of the tube body away from the pulling channel opening, through which the mode switching tube can be detachably fixed to the gun body connection portion in the form of shape fit or structure fit.

[0015] For example, in some embodiments, the sealing element can be a sealing sheet that can seal the window in a form-fitting or removable adhesive manner and can be disassembled or torn off to unseal as needed. Preferably, the sealing sheet includes a sealing protrusion and a base portion, wherein the sealing protrusion is interference-fitted with the window to achieve sealing of the window, and the base portion is detachably / removably adhesively connected to the tube body portion around the window, which can, on the one hand, support the sealing protrusion under negative pressure, and on the other hand, facilitate the disassembly or tearing of the sealing protrusion to release the negative pressure. In a preferred embodiment of the utility model, the thickness of the sealing protrusion is consistent with the thickness of the tube wall of the mode switching tube, so that the sealing protrusion can form a smooth and flat cavity with the surrounding tube inner wall to ensure that the above-mentioned negative pressure element moves smoothly, unobstructed and tightly in the mode switching tube.

[0016] For example, in other embodiments, the sealing element may be a sealing ring disposed around the outer wall or inner wall of the tube body at the window of the mode switching tube, and is configured to seal or unseal the window of the mode switching tube by rotating around the longitudinal axis of the tube body. According to different design requirements, the sealing ring may be in the form of a non-closed ring, or may be in the form of a closed or non-closed ring with one or more openings extending along the longitudinal axis of the tube body. Preferably, the size of the non-closed ring gap or the number and size of the openings are consistent with the relevant design (e.g., size or number and size) of the window of the mode switching tube.

[0017] According to the utility model, the sealing ring can be made of materials with different thicknesses, such as a metal sheet sealing ring with a certain elasticity or a hard sealing ring without elasticity. In a preferred embodiment of the utility model, a receiving groove is provided on the inner wall or outer wall of the tube body of the mode switching tube, which is recessed radially outward or inward along the tube body to accommodate the sealing ring. Preferably, especially for the hard sealing ring, the depth of the receiving groove is consistent with the thickness of the sealing ring to ensure that the above-mentioned negative pressure element or push ring moves smoothly and tightly along the mode switching tube. For the metal sheet sealing ring arranged around the inner wall of the tube body, in a preferred embodiment of the utility model, the metal sheet sealing ring is provided with a protrusion at the end edge of the non-closed annular notch or at the edge of the opening, and the protrusion and the recess on the inner wall of the tube body corresponding to its position in the negative pressure suction mode are matched in a shape-fitting manner, so that the metal sheet sealing ring can be temporarily fixed and the sealing effect can be further increased. In addition, for the sealing ring arranged around the inner wall of the tube body, a rotating dial can also be provided on the sealing ring to more conveniently operate the sealing ring to rotate around the longitudinal axis of the tube body, thereby sealing or unsealing the window of the mode switching tube.

[0018] It can be seen from this that it should be understood that according to the utility model, the "only one mode switching tube" can not only include a technical solution for realizing mode switching through a tube body, but also include any technical solution for expanding the sealing element described above into a tube body shape.

[0019] In addition, the above-mentioned shape matching (i.e., the connecting parts match each other in shape, such as snap-fitting) or structural matching (i.e., the connecting parts match each other in structure, such as threaded connection) connection methods are conventional technical means in the field. Those skilled in the art can design the connection method or position of the traction mode part, the negative pressure suction mode part or the tube connection part and the gun body connection part as needed, which will not be described in detail here.

[0020] According to the utility model, the multifunctional component can generate negative pressure in the negative pressure suction mode through the negative pressure element. The negative pressure element can be a piston element and / or a negative pressure tube, wherein the piston element can be movably sleeved on the inner wall of the mode switching tube and can axially reciprocate along the mode switching tube; the negative pressure tube is arranged on the inner wall of the mode switching tube or the gun body connecting part, and extends along the gun body connecting part or the handle part, and is connected to the negative pressure generating device. In some embodiments according to the utility model, the piston element includes a piston head and a piston rod connected thereto, and the piston head is sleeved in the mode switching tube in a shape-matching manner. In a preferred embodiment according to the utility model, the negative pressure element includes a piston head, a piston rod, and a negative pressure tube coaxially arranged with the piston rod, the piston rod passes through the inner cavity of the negative pressure tube, and extends from the opening of the negative pressure tube externally connected to the negative pressure device. In this case, the setting of the negative pressure tube will not affect the use of the piston element, and when the negative pressure tube needs to be used to connect the negative pressure device, it is only necessary to take out the piston element from the open end of the mode conversion tube, which is flexible and convenient to use. This embodiment is particularly suitable for a disposable ligation stapler assembly, so that doctors can select and apply the negative pressure application method according to the needs of the disease and their surgical habits.

[0021] In a preferred embodiment according to the utility model, a tube body recess is provided on the mode switching tube or the gun body connecting portion. By providing the tube body recess, on the one hand, the suction stroke distance of the piston and the piston rod can be controlled when necessary, and on the other hand, multiple rubber rings can be stored at one time, avoiding the cumbersomeness of temporarily taking out rubber rings during surgery and shortening the operation time. In some embodiments according to the utility model, the tube body recess is provided between the pulling mode portion and the negative pressure suction mode portion on the mode switching tube. According to other embodiments of the utility model, the tube body recess is provided on the mode switching tube or the gun body connecting portion at the connection between the tube connecting portion and the gun body connecting portion. When the reserve rubber ring is needed, the rubber ring stored in the tube body recess can be gently pushed with both hands alternately to reach the tube body end of the mode switching tube.

[0022] According to the utility model, "ligation ring" refers to all ligation rings suitable for ligation surgery that are made of elastic materials (such as colloid materials such as rubber, latex or silicone) and / or inelastic materials (such as linear materials such as silk thread), for example, rubber rings such as rubber rings, latex rings, or silicone rings that do not contain linear materials, or traction coils that do not contain colloid materials, or elastic coils that contain colloid materials and linear materials.

[0023] In a preferred embodiment of the utility model, the ligation ring includes a rubber ring and an elastic coil / traction coil, and the rubber ring and the elastic coil / traction coil are sleeved on the end of the tube body of the mode switching tube without any intervening objects. Here, "without any intervening objects" means that there is no object element between the rubber ring and the elastic coil, or between the rubber ring and the traction coil to prevent the "double ring" from detaching from the end of the tube body at the same time, and on the contrary, under the push of the push ring, the rubber ring and the elastic coil, or between the rubber ring and the traction coil will detach from the end of the tube body at the same time, thereby achieving the ligation of the pathological tissue to be ligated. Through the double-ring setting of the rubber ring plus the elastic coil or the rubber ring plus the traction coil, the "double ring" of the ligation can maintain a continuous contraction force on the tissue at the ligation site while achieving stable ligation and not easy to slip, thereby more effectively improving the clinical effect.

[0024] Correspondingly, the pushing ring mechanism also includes a pushing ring rod, one end of which is connected to the pushing ring ring, and the other end of which is connected to the driving assembly, so that it can be driven to push the pushing ring ring on the mode switching tube, and the rubber ring is pushed out of the end of the tube body through the pushing ring ring, so as to realize the ligation of the pathological tissue to be ligated by the rubber ring.

[0025] In some embodiments according to the utility model, the push ring mechanism also includes an elastic wire tube / traction wire tube and one or more guide seats for supporting the elastic wire tube / traction wire tube, wherein at least one of the guide seats is fixed on the push ring. Under the action of the driving assembly, the push ring mechanism is driven to push the push ring on the mode switching tube, and the elastic coil / traction coil, or the rubber ring and the elastic coil / traction coil are pushed out of the end of the tube body through the push ring ring to achieve the ligation of the pathological tissue to be ligated. In some embodiments according to the utility model, there are at least two guide seats, one of the at least two guide seats is a first guide seat, which is fixed on the push ring, and the other of the at least two guide seats is a second guide seat, which is fixedly arranged on the gun body shell along the extension direction of the first guide seat in the axial direction of the mode switching tube. Preferably, the second guide seat can be fixedly disposed on the gun body connection portion by means of a threaded connection, so as to support the elastic wire tube / traction wire tube and strengthen the fixing effect on the mode conversion tube connected to the gun body connection portion after it is tightened.

[0026] Furthermore, the push ring rod and the elastic wire tube / traction wire tube supported on the guide seat are arranged at two ends of the push ring relatively along the axial direction of the push ring.

[0027] In a preferred embodiment of the utility model, a push ring protrusion is provided on the inner wall of the push ring ring, and a push ring groove for accommodating the push ring protrusion is provided on the outer wall of the mode switching tube, or the mode switching tube and the concave part of the tube body. This structural design, on the one hand, makes it easier for the push ring ring to push the elastic coil / traction coil, or the rubber ring and the elastic coil / traction coil out of the end of the tube body to complete the ligation, and on the other hand, makes it easier to use the push ring ring to extract the rubber ring stored in the concave part of the tube body to the end of the tube body of the mode switching tube for the next ligation. This operation can be performed multiple times, effectively avoiding the inconvenience of putting on the rubber ring on site.

[0028] According to the utility model, the driving component can drive the multifunctional component and the push ring component separately or simultaneously to realize the push ring operation alone, or to realize the push ring operation while generating negative pressure.

[0029] The drive assembly includes a power mechanism and a gear set having a driving wheel and at least two transmission wheels. The driving wheel is connected to the power mechanism and can drive the at least two transmission wheels to rotate. One of the at least two transmission wheels is a first transmission wheel, which is connected to the negative pressure element of the multifunctional assembly (for example, meshed with a piston rod provided with a tooth end section) to generate negative pressure in a negative pressure suction mode. The other of the at least two transmission wheels is a second transmission wheel, which is connected to the push ring mechanism (for example, meshed with a push ring rod provided with a tooth end section) to realize a push ring operation.

[0030] According to the utility model, the power mechanism can be driven mechanically or electrically. For example, in the case of mechanical drive, the power mechanism may include a trigger assembly connected to the driving wheel; in the case of electrical drive, the power mechanism may include a motor connected to the driving wheel. In some embodiments according to the utility model, the trigger assembly includes a coaxially mounted trigger, a return spring, and a toothed sector meshing with the transmission wheel, wherein one end of the return spring is fixedly connected to the handle housing, and the other end is fixedly connected to the toothed sector.

[0031] According to the utility model, two active wheels can be provided, and the two active wheels drive the first transmission wheel and the second transmission wheel respectively, so as to realize the operation of generating negative pressure and the pushing ring operation in the negative pressure suction mode respectively and separately. Accordingly, the negative pressure trigger and the pushing ring trigger can be provided separately. However, the separate provision of such triggers requires frequent switching of the triggers during the operation to complete the pathological removal and ligation process, and the device structure is relatively complex, the manufacturing cost is relatively high, the operation is not convenient enough, and it is even easy to operate incorrectly.

[0032] Therefore, preferably, a driving wheel can be provided, and the stroke coordination between the piston rod and the push ring rod can be designed according to the size of the gear and the gear teeth, or a conversion switch for controlling the timing of the engagement between the transmission wheel and the push ring rod can be additionally provided to achieve the ability to drive the first transmission wheel and the second transmission wheel in steps simultaneously or through a power mechanism (such as a trigger), wherein the first transmission wheel and the second transmission wheel are relatively arranged on both sides of the driving wheel to complete the operation of generating negative pressure and the push ring operation in the negative pressure suction mode.

[0033] In some embodiments of the utility model, the multifunctional assembly may further include a negative pressure release element. The negative pressure release element may be a deflation valve disposed on the negative pressure suction mode portion of the mode switching tube or on the negative pressure tube, or may be a negative pressure release switch that interacts with the drive device to disengage the piston rod from the gear connection to release the negative pressure.

[0034] The ligation stapler provided by the utility model is the result of the inventor's decades of professional work, extensive clinical practice and market research, and multiple updates and improvements to its technical solution. Compared with the prior art, the ligation stapler according to the utility model has the following beneficial effects:

[0035] 1. By adopting the mode switching tube according to the utility model, the components required for mode switching of the existing ligation device are further optimized, which not only makes the ligation mode conversion simpler, but also makes the surgical operation more convenient and quick;

[0036] 2. By using the double-loop ligation mode of rubber ring and elastic coil / traction coil for pathological tissue, the defects of easy slippage of latex ring when used alone and insufficient continuous contraction force of elastic line when used alone are supplemented and improved, so as to increase the success rate of surgery and significantly reduce the number of cases where the rubber ring falls off prematurely, and realize the annular apposition and anastomosis growth of the broken ends of the surrounding physiological tissues, and make the wound repair more perfect;

[0037] 3. By using a push ring to replace the traditional integrated sleeve that is sleeved outside the tube, it not only simplifies the structure, reduces material costs, and broadens the surgical operation field, but also can further realize the continuous use of reserve rubber rings and shorten the operation time;

[0038] 4. There are two options for negative pressure suction. According to the needs of the disease and the doctor's habitual application, there are two options: built-in piston suction and external negative pressure device suction, which further improves the flexibility of the ligation stapler, especially suitable for disposable components. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 It is an overall perspective schematic diagram of an embodiment of the ligation stapler according to the present invention in a negative pressure suction mode.

[0040] Figure 2 It is an overall perspective schematic diagram of an embodiment of the ligation stapler according to the present invention in the pulling mode.

[0041] Figure 3 It is an overall perspective schematic diagram of another embodiment of the ligation stapler according to the present invention in the negative pressure suction mode.

[0042] Figure 4 It is an overall perspective schematic diagram of another embodiment of the ligation stapler according to the present invention in the pulling mode.

[0043] Figure 5 The present invention is a schematic structural diagram of a mode switching tube provided with a sealing element according to other embodiments of the ligation anastomosis device of the present invention; wherein, the sealing element shown in A) is a sealing sheet, the sealing ring shown in B) is a closed ring-shaped body with an opening on the surface of the ring body and arranged on the outer wall of the tube body, and the size of the opening is consistent with the window, the sealing ring shown in C) is a non-closed ring-shaped body arranged on the inner wall of the tube body, which partially covers the window, and the sealing ring shown in D) has the same structure as that of B), but is accommodated in a accommodating groove on the outer wall of the tube body.

[0044] Figure 6 It is a front view of the push ring of the ligation stapler according to the utility model; wherein A) is an embodiment of the push ring, and B) is another embodiment of the push ring, which is provided with a push ring protrusion.

[0045] Among them, 11-mode switching tube, 111-negative pressure suction mode part, 112-traction mode part, 113-tube body recessed part, 114-tube connecting part, 115-sealing sheet, 116-sealing ring, 117-window, 121-leather piston, 122-piston rod, 131-accommodating groove, 132-protrusion, 133-recess, 14-negative pressure tube;

[0046] 211-rubber ring, 212-push ring rod, 213-push ring, 221-elastic coil / traction coil, 222-elastic wire tube / traction wire tube, 223-guide seat, 231-push ring protrusion;

[0047] 3-gun body shell, 31-gun body connecting part, 321-trigger, 322-reset spring, 323-toothed sector, 331-driving wheel, 332-first gear, 333-second gear, 34-handle part. DETAILED DESCRIPTION

[0048] In order to make the purpose, technical solution and advantages of the utility model more clear, the following embodiments and the accompanying drawings are used to further describe the ligation stapler of the utility model. It should be understood that the specific embodiments described here are only used to explain the utility model, and are not used to limit the utility model.

[0049] [Example 1]

[0050] The utility model provides a ligation stapler, which is particularly suitable for ligation of pathological internal hemorrhoids, colon polyps, or redundant mucosal tissues in the anorectal department, and comprises a multifunctional component, a push ring component, and a gun body shell 3. The gun body shell 3 comprises a gun body connecting portion 31, a handle portion 34, and a driving component. The driving component comprises a trigger component having a trigger 321, a return spring 322, and a toothed sector 323, and a gear set having a driving wheel 331, a first gear 332, and a second gear 333, which is accommodated in an accommodating cavity formed by the gun body connecting portion 31 and the handle portion 34.

[0051] like Figure 1 , 2 As shown, in this embodiment, the multifunctional component includes a mode switching tube 11, wherein the mode switching tube 11 is in the shape of a hollow circular tube with openings at both ends, and the mode switching tube 11 includes two sections, a negative pressure suction mode section 111 and a pulling mode section 112. Exemplarily, in this embodiment, the total length of the mode switching tube 11 is 100-140 mm, the length of the negative pressure suction mode section 111 is 50-70 mm, and the length of the pulling mode section 112 is 50-70 mm.

[0052] The multifunctional assembly further includes a piston element composed of a piston head 121 and a piston rod 122. The piston element can be movably sleeved on the inner wall of the mode switching tube 11 and can reciprocate along the axial direction of the mode switching tube 11. Figure 1 As shown, the piston head 121 and the piston rod 122 are fixedly connected; the piston head 121 is interference-fitted into the mode switching tube 11 .

[0053] When the surgical mode is vacuum suction ligation, Figure 1 As shown, the negative pressure suction mode part 111 of the mode switching tube 11 is located at the front end of the ligation stapler, and the pulling mode part is detachably fixedly sleeved on the gun body connecting part 31 of the gun body shell 3. When performing negative pressure suction ligation, the driving assembly drives the piston element to gradually move from the front end to the rear end of the mode switching tube 11, so that negative pressure is formed inside the mode switching tube 11. Under the action of this negative pressure, the pathological tissue to be ligated is sucked into the mode switching tube 11, completing the negative pressure suction operation.

[0054] When the surgical mode is traction band ligation, such as Figure 2As shown, the pulling mode part 112 is located at the front end of the ligation stapler, and the negative pressure suction mode part 111 is detachably fixedly sleeved on the gun body connecting part 31 of the gun body shell 3. When pulling and ligating, the tissue forceps (such as Alice forceps) can enter the mode switching tube 11 through the window 117 of the pulling mode part 112, and extend from the opening of the adjacent tissue end, clamp the pathological tissue to be ligated, and pull it into the mode switching tube 11 to complete the pulling operation. Because the window 117 is adjacent to the pathological tissue to be pulled, and the Alice forceps are easy to use, the pulling operation is easy to perform.

[0055] like Figure 1 , 2 As shown, in this embodiment, the push ring assembly includes a rubber ring 211, a push ring rod 212 and a push ring ring 213. The front end of the push ring rod 212 is fixedly connected to the push ring ring 213 as a whole and is located below the mode switching tube 11 and parallel to the tube body of the mode switching tube 11. The push ring rod 212 is configured to be driven to push the rubber ring 211 forward along the axis of the mode switching tube 11, so that the rubber ring 211 is ligated on the pathological tissue.

[0056] Preferably, if Figure 1 , 2 As shown, the push ring assembly also includes an elastic coil 221, an elastic wire tube 222 and a guide seat 223. There are two guide seats 223, one of which is fixed on the push ring 213, opposite to the push ring rod 212, and located above the mode switching tube 11; the other guide seat is fixed on the gun body connection part along the axial direction of the mode switching tube 11, and the elastic wire tube 222 is supported on the guide seat.

[0057] like Figure 1 and 2 As shown, the front end of the outer wall of the mode switching tube 11 is movably sleeved with the elastic coil 221, the rubber ring 211 and the push ring 213 in sequence. There is no object element between the elastic coil 221 and the rubber ring 211 to prevent the "double loops" from detaching from the end of the tube body at the same time.

[0058] During operation, the ring-applying device is used to put the rubber ring 211 on the front end of the tube body of the mode switching tube 11 and close to the push ring 212. The elastic coil 221 passes through the elastic wire tube 222, one end is put on the front end adjacent to the rubber ring 211 to form a double ring, and the other end is fixed to the rear end of the elastic wire tube 222. The driving component pushes the push ring rod 212 to move forward along the mode switching tube 11, thereby pushing the push ring 212. The push ring 212 pushes the rubber ring 211 and the elastic coil 221 out of the end of the tube body, so that the double ring is detached from the end of the tube body and ligated on the pathological tissue to be ligated, thereby completing the ligation of the hemorrhoidal tissue. It should be understood that the step of installing the double loop can also be carried out as follows: use a looper to install the rubber ring 211 on the front end of the tube body of the mode switching tube 11, and leave a gap for placing the elastic coil 221 near the push ring 212. The elastic coil 221 passes through the elastic wire tube 222, one end is installed in the gap to form a double loop, and the other end is fixed to the rear end of the elastic wire tube 222.

[0059] like Figure 1 , 2 As shown, the mode switching tube 11 also includes a tube body recessed portion 113 located between the negative pressure suction mode portion 111 and the pulling mode portion 112, and the diameter of the tube body recessed portion 113 is smaller than the diameters of the negative pressure suction mode portion 111 and the pulling mode portion 112. By providing the tube body recessed portion 113, the suction distance of the piston element can be controlled, and multiple rubber rings can be stored at one time, avoiding the tediousness of temporarily taking out rubber rings during surgery, and further simplifying the surgical operation.

[0060] like Figure 1 , 2 As shown, the drive assembly includes a trigger assembly and a gear set.

[0061] The trigger assembly includes a coaxially mounted trigger 321 , a return spring 322 and a toothed sector 323 , wherein one end of the return spring 322 is fixedly connected to the gun body housing 3 , and the other end is fixedly connected to the toothed sector 323 .

[0062] The gear set includes a driving wheel 331, a first gear 332 and a second gear 333, all of which are coaxially and parallelly installed in the gun body housing 3; the driving wheel 331 is meshed with the toothed sector 323; the piston rod 122 includes a toothed end, the tooth pitch of the toothed end is equal to the tooth pitch of the first gear 332 and meshes with it; the push ring rod 212 includes a toothed end, the tooth pitch of the toothed end is equal to the tooth pitch of the second gear 333 and meshes with it. The toothed ends of the piston rod 122 and the push ring rod 212 are respectively arranged on opposite sides of the gear axis. The diameters and tooth pitches of the above gears can be set as needed.

[0063] During negative pressure suction ligation, the trigger 321 is pulled, and the trigger 321 drives the toothed sector gear 323 to rotate counterclockwise, and the driving wheel 331 meshing with it rotates clockwise; at the same time, the coaxial first gear 332 rotates clockwise, driving the piston rod 122 meshing with it to move from the front end to the rear end, so that negative pressure is formed inside the mode switching tube, thereby attracting the pathological tissue into the mode switching tube 11; then, the push ring rod is meshed with the second gear 333, and when the coaxial second gear 333 rotates clockwise, it drives the push ring rod 212 meshing with it to move forward, thereby pushing the rubber ring 211 and the elastic coil 221 to ligate the pathological tissue.

[0064] Among them, the method of realizing the meshing of the push ring rod 212 with the second gear 333 and driving the push ring rod 212 to move after the pathological tissue is sucked into the mode switching tube 11 is a prior art, and those skilled in the art can design it according to needs, which is not limited here. Figure 1 As shown, the second gear 333 has a notch and a meshing portion. When the first gear 332 rotates clockwise, the piston rod 122 meshing therewith is driven to move from the front end to the rear end in the initial stage, the coaxial second gear 333 rotates clockwise, and the gear teeth on the second gear 333 located at the notch do not mesh with the toothed end of the push ring rod 212, so that the output torque of the second gear 333 is disengaged from the push ring rod 212; when the pathological tissue is attracted into the mode switching tube 11, the gear teeth on the second gear 333 located at the meshing portion mesh with the toothed end of the push ring rod 212, and the output torque of the second gear 333 is transmitted to the toothed end of the push ring rod 212 through the gear teeth of the meshing portion, so that the push ring rod 212 moves forward, thereby pushing the rubber ring 211 and the elastic coil 221 to ligate the pathological tissue. Correspondingly, during traction and ligation, after the tissue forceps (such as Alice forceps, etc.) complete the clamping and traction operation on the pathological tissue through the traction mode part 112, the trigger 321 is pulled, and the trigger 321 links the coaxial second gear 333 to rotate clockwise at the same time, and the gear teeth located at the meshing part of the second gear 333 mesh with the toothed end of the push ring rod 212, and the output torque of the second gear 333 is transmitted to the toothed end of the push ring rod 212 through the gear teeth of the meshing part, so that the push ring rod 212 moves forward, thereby pushing the rubber ring 211 and the elastic coil 221 to perform ligation on the pathological tissue. It should be understood that it can also be achieved by setting a conversion structure (for example, sliding a rotating shaft between the first gear 332 and the second gear 333, or setting a sliding key on the rotating shaft) to sequentially transmit the power of pulling the trigger 321 to the first gear 332 and the second gear 333. The conversion structure is used to switch the two states of the second gear 333 obtaining power and losing power.

[0065] In addition, the power of pulling the trigger 321 can be sequentially transmitted to the first gear 332 and the second gear 333 by improving the structure of the push ring rod 212. For example, a hinge point is provided between the toothed end and the push ring end of the push ring rod 212, so that the toothed end of the push ring rod 212 can rotate around the hinge point, thereby realizing the two states of disengagement and engagement between the toothed end and the second gear 333.

[0066] When the ligation stapler according to the present invention needs to be used in the negative pressure suction mode:

[0067] The specific assembly steps are as follows: place the negative pressure suction mode part 111 of the mode switching tube 11 at the front end, then insert the piston element from the front end of the mode switching tube 11 into the tube body of the negative pressure suction mode part 111, and then sleeve the push ring 213 on the negative pressure suction mode part 111; sleeve the pulling mode part 112 into the gun body shell 3, and make the tooth end of the piston rod 122 mesh with the top of the first gear, then insert the push ring rod 212 into the gun body shell 3, and make the push ring rod contact with the teeth of the notch part of the second gear 333; sleeve the rubber ring 211 onto the front end of the mode switching tube 11 and close to the push ring 213, one end of the elastic coil 221 is sleeved on the rubber ring 211, the elastic line tube 222 is placed stably along the guide seat 223, and the other end of the elastic coil 221 is knotted on the guide seat 223;

[0068] When performing negative pressure suction ligation, align the end of the mode switching tube 11 with the pathological tissue to be ligated, press it and then continue to slowly pull the trigger 331 to drive the piston element to move to the rear end, so that negative pressure is generated in the tube mouth, thereby sucking the ligated pathological tissue into the mode switching tube 11; drive the push ring 213 to push the rubber ring 211 and the elastic coil 221 (referred to as double rings) to slide to the ligated tissue, tighten the elastic coil 221, ligate the pathological tissue, release the trigger, and the reset spring drives the trigger to reset, release the negative pressure, take out the ligation stapler, cut off the tail of the elastic coil 221, and complete the negative pressure suction ligation of a pathological tissue.

[0069] When a series of push rings are needed, push the push ring rod 212 downward to disengage it from the bottom of the second gear 333, move the push ring ring 213 toward the front end, and pull the push ring rod 212 out of the gun body shell so that the push ring ring can move freely along the mode switching tube; then, move the push ring rod to the position of the tube body recess 13, and manually or with the help of the push ring ring push out the spare rubber ring 211 stored in the tube body recess 13 in turn, repeat the above ligation steps, and complete the negative pressure suction ligation of the next pathological tissue.

[0070] Preferably, if Figure 6As shown in FIG. 2B , a push ring protrusion 231 can be provided on the inner wall of the push ring ring 213, and a push ring groove for accommodating the push ring protrusion 231 can be provided on the outer wall of the mode switching tube 11 and the concave part 113 of the tube body. In this way, it is convenient to push the double ring out of the end of the tube body to complete the ligation, and it is also convenient to pull the rubber ring 211 stored in the concave part 113 of the tube body to the end of the tube body of the mode switching tube 11 for the next ligation. This operation can be performed multiple times, effectively avoiding the inconvenience of putting on the rubber ring on site.

[0071] When the ligation stapler according to the present invention needs to be used in the traction mode:

[0072] The specific assembly steps are as follows: take out the piston element, then place the pulling mode part 112 of the mode switching tube 11 at the front end, then put the push ring 213 on the front end of the pulling mode part 112 and close to the push ring 213; then, put the negative pressure suction mode part 111 into the gun body shell 3, and insert the push ring rod 212 into the gun body shell 3, so that the push ring rod 212 contacts the gear teeth of the notch part of the second gear 333; then, put the rubber ring 211 on the front end of the mode switching tube 11, one end of the elastic coil 221 is put on the rubber ring 211, the elastic wire tube 222 is placed stably along the guide seat 223, and the other end of the elastic coil 221 is knotted on the guide seat 223.

[0073] When performing traction ligation, a tissue forceps (such as Alice forceps, etc.) is inserted into the mode switching tube 11 through the traction mode portion 112 to clamp the pathological tissue and pull the tissue into the main tube 11. The trigger 331 is slowly and continuously pulled to drive the push ring 213 to push the rubber ring 211 and the elastic coil 221 (referred to as double coils) to slide down to the pathological tissue to be ligated, tighten the elastic coil 221, complete the ligation of the pathological tissue, then loosen and remove the tissue forceps, take out the ligation stapler, and then cut off the tail of the elastic coil 221 to complete a traction ligation.

[0074] The ligation stapler disclosed by the utility model realizes that a set of ligation instruments can be used to conveniently select a negative pressure suction ligation or a traction ligation mode according to the size, position, and smoothness of the surface (forming a closed negative pressure) of the pathological tissue, thereby simplifying the surgical operation and greatly improving the flexibility and practicality of the application.

[0075] It should be understood that the driving assembly of the push ring and the piston rod, the cooperation between them, and the negative pressure release method can be any conventional technical means in the art. In this regard, those skilled in the art can design and combine them according to the needs in combination with the existing technology. No further description is made here, nor is it limited.

[0076] [Example 2]

[0077] like Figure 3, 4 As shown, compared with the first embodiment, the main difference of the ligation stapler in this embodiment is that a mode switching tube 11 provided with a sealing element (such as a sealing ring 116) is used, and a structural example of using a negative pressure tube 14 for an external negative pressure device as a negative pressure element is shown. It should be understood that the mode switching tube 11 and the negative pressure element shown in the first embodiment and this embodiment can be combined and designed with each other as needed.

[0078] It should be understood that the negative pressure tube 14 can also be configured as a tube body coaxial with the piston element, wherein the piston rod passes through the inner cavity of the negative pressure tube and extends from the opening of the negative pressure tube connected to the negative pressure device, so that the doctor can select and apply the negative pressure application method according to the needs of the disease and his surgical habits. Figure 3 , 4 As shown, the mode switching tube 11 includes a non-closed sealing ring 116 and a tube connecting portion 114 arranged around the outer wall of the tube body at the window, wherein the tube connecting portion 114 is detachably fixed to the gun body connecting portion 31 in a form of shape fit, and the sealing ring 116 is configured to be able to seal by rotating around the longitudinal axis of the tube body (such as Figure 3 ) or unblock (such as Figure 4 ) The window 117 of the mode switching tube is used to realize the switching between the negative pressure suction mode and the traction mode.

[0079] also, Figure 5 Other forms of a mode switching tube 11 provided with a sealing element according to the present invention are also shown by way of example and not limitation: for example, the sealing sheet 115 in A) can seal the window 117 in a form-fitting or removable adhesive manner, so that the mode switching tube 11 has a negative pressure suction function, and the sealing sheet 115 can also be disassembled or torn off to unseal as needed, thereby switching the mode switching tube 11 from the negative pressure function to the pulling function. B), C) and D) all show a mode switching tube 11 provided with a sealing ring 116, wherein in B) and D), the sealing ring 116 is arranged around the outer wall of the tube body of the mode switching tube 11, and in C), the non-closed sealing ring 116 is arranged around the inner wall of the tube body of the mode switching tube 11, and, in order to temporarily fix the sealing ring 116 and further increase the sealing effect, the sealing ring 116 is provided with a protrusion 132 at the edge of the end of the non-closed annular notch, and the protrusion matches the recess 133 on the inner wall of the tube body corresponding to its position in the negative pressure suction mode in a form-fitting manner. The sealing ring 116 in B) is a closed ring, and has openings on the surface of the ring body that are the same in number and size as the windows 117 on the mode switching tube 11. D) shows that the sealing ring 116 of the same structure is accommodated in the accommodating groove 131 on the outer wall of the tube body of the mode switching tube 11.

[0080] [Effect comparison example]

[0081] In this embodiment, the effects of using rubber band ligation alone and using "double band" (rubber band and elastic coil) ligation on the treatment effect in hemorrhoid ligation are shown.

[0082] To this end, 216 patients who had been treated with band ligation in the hospital medical records during the 16-month period from August 1, 2022 to November 25, 2023 were counted. Among them, 108 cases who had been treated with double-loop ligation for nearly 7 months were randomly selected as the treatment group according to different treatment time periods, and 108 cases who had been treated with rubber band ligation alone for about 9 months before were selected as the control group. The results showed that the number of cases in which the rubber band fell off prematurely and caused the ligation to fail in the treatment group and the control group were 3 cases (2.7%) and 12 cases (11.1%), respectively. It can be seen that the proportion of ligation failure caused by premature detachment of the rubber ring in the control group was significantly greater than that in the treatment group.

[0083] It should be noted that the technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification. Various objects in the drawings of the embodiments are drawn according to the scale for easy enumeration and description, rather than the scale of the actual components.

[0084] The above-mentioned embodiments only express several implementation methods of the utility model, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent of the utility model. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the technical concept of the utility model, and these all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A ligation stapler for ligation of pathological internal hemorrhoids, colon polyps, or lengthy mucosal tissues in anorectal surgery, characterized in that: It includes a gun body shell, a multifunctional component, and a push ring component; The gun body shell includes a gun body connecting portion, a handle portion, and a driving component configured to drive both the multifunctional component and the push ring component, wherein the driving component is accommodated in an accommodating cavity formed by the gun body connecting portion and the handle portion; The multifunctional component comprises a mode switching component and a negative pressure element, wherein the mode switching component is configured to be able to switch between a negative pressure suction mode and a pulling mode, and the negative pressure element is configured to be able to generate negative pressure in the negative pressure suction mode, and the negative pressure element is a piston element and / or a negative pressure tube for an external negative pressure device; wherein the mode switching component comprises only one mode switching tube, the two ends of the mode switching tube are open, and the mode switching tube is connected to the gun body housing through the gun body connecting portion, and at least one window is opened on the tube body adjacent to one end of the mode switching tube, and the window and the tube body opening adjacent to one end form a pulling channel for pulling operation; The push ring assembly at least includes a ligation ring and a push ring mechanism provided with a push ring ring, the ligation ring can be movably mounted on the end of the tube body of the mode switching tube, the push ring ring can be movably mounted on the outer wall of the mode switching tube, and the push ring mechanism is constructed to be able to be driven to move the push ring ring in the axial direction along the mode switching tube, and the ligation ring is pushed out of the end of the tube body by the push ring ring, so that the ligation ring is ligated on the pathological tissue to be ligated after being detached from the end of the tube body.

2. The ligation stapler according to claim 1, characterized in that: The mode switching tube is a hollow tube body with two ends open, including a pulling mode part and a negative pressure suction mode part, wherein the pulling mode part is a tube body part at one end provided with the window and configured for pulling operation, and the negative pressure suction mode part is a tube body part at the other end away from the window and configured for negative pressure operation; The pulling mode part or the negative pressure suction mode part is detachably fixed on the gun body connecting part in a form of shape matching or structure matching.

3. The ligation stapler according to claim 1, characterized in that: The mode switching tube is a hollow tube body with openings at both ends and is provided with a sealing element, and the sealing element is configured to match the window and seal or unseal it; the mode switching tube is integrally formed with the gun body connecting part; or, the mode switching tube also includes a tube connecting part arranged at the other end of the tube body away from the pulling channel opening, through which the mode switching tube is detachably fixed to the gun body connecting part in the form of shape fit or structural fit.

4. The ligation stapler according to claim 3, characterized in that: The sealing element is a sealing sheet that can seal the window in a form-fitting or removable adhesive manner and can be disassembled or torn off to unseal as needed.

5. The ligation stapler according to claim 3, characterized in that: The sealing element is a sealing ring disposed around the outer wall or inner wall of the tube body at the window of the mode switching tube, and is configured to seal or unseal the window of the mode switching tube by rotating around the longitudinal axis of the tube body.

6. The ligation stapler according to claim 5, characterized in that: The sealing ring is in the form of an open ring, or a closed or open ring with one or more openings extending along the longitudinal axis of the tube body.

7. The ligation stapler according to claim 5, characterized in that: An accommodating groove recessed radially outward or inward along the tube body is provided on the inner wall or the outer wall of the tube body of the mode switching tube to accommodate the sealing ring.

8. The ligation stapler according to claim 1, characterized in that: The ligation ring comprises a rubber ring and an elastic coil / traction coil, and the rubber ring and the elastic coil / traction coil are sleeved on the end of the tube body of the mode switching tube without any spacer.

9. The ligation stapler according to claim 1, characterized in that: A push ring protrusion is arranged on the inner wall of the push ring ring, and a push ring groove for accommodating the push ring protrusion is arranged on the outer wall of the mode switching tube.

10. The ligation stapler according to claim 1, characterized in that: The arc length of the one window along the circumferential direction or the total arc length of the multiple windows along the circumferential direction is no greater than 1 / 2 of the circumferential length of the tube body.

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