Method for setting elastic threads in ligation device and automatic elastic thread ligation device

The present invention provides a method for setting elastic threads in a ligation device and an automatic elastic thread ligation device using the method. At least one elastic thread (2) is arranged along the outer wall of a barrel (3) of the ligation device, and an annular sleeve (21) with an adjustable aperture and formed at the front end of the elastic thread (2) is sleeved on the outer wall of the front end of the barrel; a traction thread (26) on the ligation device is connected with the annular sleeve (21) of the elastic thread (2), and when the traction thread (26) is pulled, the traction thread drives the annular sleeve (21) to move towards the orifice of the barrel (3), until the annular sleeve is disengaged from the orifice; a force bearing part of the annular sleeve (21) at the front end of the elastic thread is propped forwards, meanwhile, the tail end of the elastic thread (2) is pulled backwards, and the countertraction between the two acting forces leads to a gradual decrease of the aperture of the annular sleeve (21) at the front end of the elastic thread (2). In the automatic elastic thread ligation device, rubber rings are replaced by the elastic threads, after the annular sleeve at the front end of the elastic thread is pulled by the traction thread and pops up from the orifice of the barrel, the aperture of the annular sleeve can be decreased gradually by pulling the tail end of the elastic thread until the aperture becomes approximately zero, so that tighter ligation of the target tissue can be achieved, and an ulcer surface is extremely small after the target tissue becomes necrotic and falls off, so that the probability of postoperative bleeding is lowered.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims priority from PCT Application No. PCT/CN2014/082223, filed Jul. 15, 2014 and CN Application No. 201310430853.4, filed Sep. 18, 2013, the contents of which are incorporated herein in the entirety by reference.

FIELD OF THE INVENTION

The present invention relates to medical instrument technology, particularly relates to a method for setting elastic threads in a ligation device, and further relates to an automatic elastic thread ligation device using the method.

BACKGROUND OF THE INVENTION

“Ligation of hemorrhoids (also known as rubber ring ligation of hemorrhoids, suction ligation of hemorrhoids and the like)” is a common method for treating hemorrhoids, the curative effect is exact, the principle thereof is to ligate a specially-made rubber ring (such as a rubber ring, a latex ring, a silicone ring and the like) on the roots (or the substrates) of hemorrhoids, to block blood supply to the hemorrhoids via the elastic retractive force of the rubber ring to induce necrosis, atrophy and fall-off of the hemorrhoids, so as to fulfill a cure purpose. Traditional instruments used for carrying out the ligation surgery are extremely simple, time-consuming and laborious to operate and are prone to leading to complications. To change this situation, over the past decade, an automatic instrument, namely, an automatic hemorrhoids ligation device (also known as a repeating hemorrhoids ligation device, a repeating hemorrhoids suction ligation device and the like), has been proposed to make the ligation surgery be simple and easy. The advantages of using the instrument to perform the ligation surgery are as follows: the operation is simple, convenient, fast and accurate; a single person can finish the surgery, and only 5-10 minutes are taken; the probability of complications is lower; patients generally need no anesthesia, and the pain is mild; most patients do not need to be hospitalized, so that the treatment cost is low.

The Chinese authorized utility model patents (ZL200820051521.X) discloses a repeating hemorrhoids suction ligation device, including a body, as well as a pipe body arranged at the front end of the body, a plurality of stretched rubber rings which are sleeved on the pipe body in sequence, a negative pressure suction joint arranged behind the pipe body and communicated with the inner cavity of the pipe body and a rubber ring popup device arranged on the body, wherein an emission head communicated with the inner cavity of the pipe body is sleeved on the front end of the pipe body, and the rubber rings are sleeved on the emission head; the rubber ring popup device includes at least one traction thread and a winding device arranged in the body, the front end of the traction thread is winded on the winding device; the tail end of the traction thread penetrates through the interior of the pipe body, is folded back from the orifice of the emission head and is connected with the rubber rings along the outer wall of the emission head through a traction mechanism.

The above-mentioned hemorrhoids suction ligation device (also known as a hemorrhoids ligation device) and other types of hemorrhoids ligation devices at home and abroad have a common feature, that is, “rubber rings” are used as basic materials which are ligated on the roots of hemorrhoids; available raw materials for making the rubber rings include natural rubber, latex or silica gel, etc.

The clinical efficacy of the rubber ring ligation of hemorrhoids is directly related to two technical indicators, namely, “internal aperture of the rubber ring” and “the elastic retractive force of the rubber ring”. The use of the rubber ring as the ligation material has some inherent disadvantages: (1) due to the inherent characteristics of the natural rubber (or latex or silica gel and the like), the internal aperture of the rubber ring cannot be infinitely small, and the rubber ring can be generally only made to 2.0-2.5 mm (at least not less than 1.5 mm), otherwise the rubber ring is easy to break when being stretched in a ligation process. This means that within the size range of the diameter of 2.0-2.5 mm (at least not less than 1.5 mm), the ligated hemorrhoids tissues are applied with no elastic retractive force, and finally, ulcer formed after tissue necrosis and fall-off ranges for about 2.0-2.5 mm (at least not less than 1.5 mm); (2) when the rubber rings are installed on the ligation device at a stretched state, the rubber rings are liable to fatigue gradually with time to increase the internal aperture; and (3) due to the influence of such factors as climate and environment and the like, the rubber rings are easy to age over time, so that the elastic retractive force becomes weaker.

Due to the influence of the above factors, the following consequences will be generated possibly: (1) rubber ring slippage occurs within a short period after the surgery, resulting in treatment failure; (2) postoperative bleeding complications are generated (according to statistics, the postoperative bleeding rate of the rubber ring ligation of hemorrhoids is 2-5%); and (3) hemorrhoids block necrosis is incomplete, healing of the ulcer surface is delayed and the efficacy is influenced.

SUMMARY OF THE INVENTION

One purpose of the present invention is to provide a method for setting elastic threads in a ligation device, which can be used for conveniently adjusting the popup and tightening of elastic threads.

The above purpose of the present invention is achieved by the following technical measures: a method for setting elastic threads in a ligation device, wherein at least one elastic thread is arranged along the outer wall of a barrel of the ligation device, and an annular sleeve with an adjustable aperture and formed at the front end of the elastic thread is sleeved on the outer wall of the front end of the barrel; a traction thread on the ligation device is connected with the annular sleeve of the elastic thread, and when the traction thread is pulled, the traction thread drives the annular sleeve to move towards the orifice of the barrel until the annular sleeve is disengaged from the orifice; a force bearing part of the annular sleeve at the front end of the elastic thread is propped forwards, meanwhile, the tail end of the elastic thread is pulled backwards, and countertraction between the two acting forces leads to a gradual decrease of the aperture of the annular sleeve at the front end of the elastic thread.

In the present invention, rubber rings are replaced by the elastic threads, after the annular sleeve at the front end of the elastic thread is pulled by the traction thread and pops up from the orifice of the barrel, the aperture of the annular sleeve can be decreased gradually by pulling the tail end of the elastic thread until the aperture becomes approximately zero, and thus the aperture of the annular sleeve of the elastic thread can be effectively adjusted.

According to the present invention, the annular sleeve with the adjustable aperture and at the front end of the elastic thread is formed by knotting a slipknot, and the knotting point of the annular sleeve is the force bearing part propping against the annular sleeve; or the annular sleeve with the adjustable aperture and at the front end of the elastic thread is formed by penetrating a thread fixing bead through the elastic thread, and the thread fixing bead is the force bearing part propping against the annular sleeve.

As an embodiment of the present invention, a thread ejector sleeve is arranged on the elastic thread, and after the tail end of the elastic thread penetrates through the thread ejector sleeve, the tail end of the elastic thread is buckled with the orifice at the rear end of the thread ejector sleeve; a force is applied to the thread ejector sleeve, to prop the orifice at the front end thereof against the force bearing part of the annular sleeve, meanwhile, the tail end of the elastic thread is pulled backwards, and the countertraction between the two forces leads to the gradual decrease of the aperture of the annular sleeve.

According to the present invention, a neck is formed in the tail end of the thread ejector sleeve, and a shiftable clamping projection is arranged in the neck to position the thread ejector sleeve.

Another purpose of the present invention is to provide an automatic elastic thread ligation device. The ligation device replaces the ligation rubber rings in the prior art with elastic threads, and the ligation apertures of the elastic threads can be effectively adjusted.

The above purpose of the present invention is achieved by the following technical solutions: an automatic elastic thread ligation device includes a barrel, a gun body and a traction thread, wherein the traction thread penetrates through the barrel and the rear end thereof is positioned in the gun body, the front end of the traction thread is folded back on the outer wall of the front end of the barrel after stretching out from the barrel; wherein the automatic elastic thread ligation device further includes at least one elastic thread, the elastic thread is arranged along the outer wall of the barrel, an annular sleeve with an adjustable aperture and formed at the front end of the elastic thread is sleeved on the outer wall of the front end of the barrel, and the annular sleeve is connected with the front end of the traction thread; when the traction thread is pulled backwards, the traction thread drives the annular sleeve to move towards the orifice of the barrel until the annular sleeve is disengaged from the orifice; a force bearing part of the annular sleeve at the front end of the elastic thread is propped forwards, meanwhile, the tail end of the elastic thread is pulled backwards, and countertraction between the two forces leads to a gradual decrease of the aperture of the annular sleeve.

According to the present invention, the traction thread pulls the annular sleeve to sleeve the same on a target tissue, and since the aperture of the annular sleeve can be gradually decreased, tighter ligation of the target tissue can be achieved; the ulcer surface is extremely small after the target tissue becomes necrotic and falls off, so that the probability of postoperative bleeding is reduced, and meanwhile, other inherent disadvantages of the aforementioned rubber ring ligation surgery are avoided, for example, rubber ring slippage occurs after a short period to result in treatment failure, and hemorrhoids block necrosis is incomplete to delay the healing of the ulcer surface, etc.

The automatic elastic thread ligation device provided by the present invention further includes a thread ejector sleeve used for propping against the force bearing part, one thread ejector sleeve is sleeved on each elastic thread, the tail end of the elastic thread penetrates through the thread ejector sleeve and is buckled with the orifice at the rear end of the thread ejector sleeve, and the rear of the thread ejector sleeve is inserted into the gun body.

As an embodiment of the present invention, the rear of the thread ejector sleeve is inserted into the gun body through a thread ejector sleeve release mechanism, the thread ejector sleeve release mechanism includes a slide rail and a thread ejector sleeve release button, wherein the slide rail is transversely arranged on the inner wall of the gun body along the inner cavity of the gun body, the thread ejector sleeve release button is slidably installed on the slide rail, and the thread ejector sleeve release button is exposed on the side face of the gun body, a clamping projection is arranged on the thread ejector sleeve release button, a neck is formed in the rear of the thread ejector sleeve, and the clamping projection is clamped in the neck to position the thread ejector sleeve.

According to the present invention, the thread ejector sleeve release button is integrally made from a press panel, a rectangular elastic arm and a slide block, wherein one end of the slide block and the one end of the elastic arm are respectively connected to the back surface of the press panel, and the slide block is located above the elastic arm, the slide block is slidably installed on the slide rail, the clamping projection is located on the top face of the slide block, the neck of the thread ejector sleeve corresponds to the clamping projection downwards, the other end of the elastic arm is used as the lower end of the elastic arm to be propped on the inner wall of the gun body, the original length of the elastic arm is larger than the length of the slide block, and the press panel is located on the side face of the gun body for receiving a press force.

As another embodiment of the present invention, the rear of the thread ejector sleeve is inserted into the gun body through a thread ejector sleeve popup mechanism, the thread ejector sleeve popup mechanism includes a thread ejector sleeve release wheel and at least one strip-shaped thread ejector sleeve limiting plate, one thread ejector sleeve is correspondingly clamped and limited at the front end part of each thread ejector sleeve limiting plate, all the thread ejector sleeve limiting plates are arranged in parallel along the longitudinal direction and are collectively hinged on the inner wall of the gun body via the middle part; at least one projection used for prizing the thread ejector sleeve limiting plate is alternately distributed on the circumferential wheel surface of the thread ejector sleeve release wheel, the rotation of each projection with the thread ejector sleeve release wheel corresponds to one thread ejector sleeve limiting plate located above the wheel surface, the thread ejector sleeve release wheel is rotated to enable the projection to lift the rear end part of the corresponding thread ejector sleeve limiting plate, so as to drive the thread ejector sleeve limiting plate to rotate around a hinge shaft thereof, the front end part of the thread ejector sleeve limiting plate drops off to withdraw the limit on the thread ejector sleeve, and the thread ejector sleeve pops up under the restoring force of the elastic thread.

The above-mentioned thread ejector sleeve popup mechanism is composed of few parts and components, and the parts and components are simple in structures and low in manufacturing costs; necks with different positions do not need to be arranged on each thread ejector sleeve, thereby lowering the manufacturing difficulty; moreover, when popping out the thread ejector sleeve, the thread ejector sleeve release wheel is rotated to enable the projection thereon to lift the thread ejector sleeve limiting plate, so as to withdraw the limit on the thread ejector sleeve, and the acting force applied to the thread ejector sleeve release wheel will not influence the holding stability, therefore the operation is convenient.

According to the present invention, a fixture block is arranged at the front end part of the thread ejector sleeve limiting plate, a clamping joint connected with the tail end of the elastic thread is inserted into the orifice at the rear end of the thread ejector sleeve, a limiting groove is formed on the clamping joint, and the fixture block is clamped in the limiting groove.

As an embodiment of the present invention, the clamping joint is mainly composed of a columnar inner segment inserted into the orifice at the rear end of the thread ejector sleeve and an outer segment stretching out from the thread ejector sleeve, the limiting groove is annularly formed in the spindle-shaped outer segment, a neck is formed in the upper end of the fixture block, the notch of the neck is upward, the outline thereof is applicable to the outline of the bottom of the limiting groove, and the neck is clamped in the limiting groove.

To improve the installation stability of the thread ejector sleeve, as an improvement of the present invention, the thread ejector sleeve popup mechanism of the automatic elastic thread ligation device further includes a rear supporting seat used for being inserted into the outer segment of the clamping joint and a front supporting seat used for guiding the thread ejector sleeve to install the same in the gun body of the ligation device, the rear of the thread ejector sleeve stretches into the rear supporting seat after penetrating through the front supporting seat, and the fixture block is clamped in the limiting groove on the front side of the rear supporting seat.

As a further improvement of the present invention, an elastic arm obliquely extends from the lower side of the fixture block at the front end part of the thread ejector sleeve limiting plate, the front end of the elastic arm is propped on a supporting column for providing an upward acting force to jack the fixture block of the thread ejector sleeve limiting plate in the limiting groove of the clamping joint and resetting the prized projection of the thread ejector sleeve limiting plate at the same time.

According to the present invention, a marker used for marking the thread ejector sleeve is arranged on the circumference of the side face of the thread ejector sleeve release wheel, and the position of the marker corresponds to that of the projection to master the popup condition of the thread ejector sleeve.

Further, the automatic elastic thread ligation device provided by the present invention further includes a reel, the reel is arranged at the rear in the gun body, and the rear end of the traction thread is winded on the reel for positioning the rear end of the traction thread.

According to the present invention, the front end of the traction thread is located between the outer wall of the barrel and the annular sleeve, a traction block is arranged on the front end of the traction thread, and the traction block is located behind the annular sleeve for clamping the annular sleeve to connect the traction thread with the annular sleeve.

As a further improvement of the present invention, an emission head is installed at the front end of the barrel in the present invention, and the annular sleeve of the elastic thread is sleeved on the outer wall of the emission head; the traction thread is composed of a main traction thread and at least two branch traction threads, which are interconnected, the other end of the main traction thread is winded on the reel, the other end of each branch traction thread is folded back on the outer wall of the emission head after stretching out from the orifice of the emission head, and the branch traction threads are symmetrically distributed along the orifice of the emission head to provide a uniform tension to the annular sleeve of the elastic thread.

According to the present invention, the elastic thread is formed by wrapping an elastic strip (an inner layer) with a netty woven layer (an outer layer), both are made from a high molecular material, and the netty woven layer can expand with the stretching of the elastic strip. This special double-layer structure of the elastic thread not only ensures good elasticity, but also can bear strong axial tension without breaking, and when being sleeved on the target tissue, the annular sleeve of the elastic thread at the stretched state can be further tightened to decrease the aperture; in addition, the elastic thread is unlikely to age and fatigue, so that the service life is long, and the ligation effect can be improved.

As an embodiment of the present invention, the barrel is detachably inserted onto the gun body, the rear end of the traction thread is connected to a driving wheel located at the rear of the gun body through a transfer transmission mechanism, and the transfer transmission mechanism is driven by the driving wheel to pull the traction thread backwards.

According to the present invention, the transfer transmission mechanism includes a traction thread turn button, a transfer shaft and a transmission belt, wherein the transfer shaft is transversely arranged at the front end in the gun body5along the transverse direction, one end of the transmission belt is winded on the driving wheel, the other end of the transmission belt is sleeved on the inner end of the transfer shaft, the traction thread turn button is sleeved on the outer end of the transfer shaft, the traction thread turn button is engaged with the sleeving position of the transfer shaft, the rear end of the traction thread is winded on the traction thread turn button, the driving wheel is shifted to drive the transfer shaft to rotate through the transmission belt, so that the traction thread turn button rotates for winding the thread to pull the traction thread backwards, so as to drive the annular sleeve to move towards the orifice of the barrel until the annular sleeve is disengaged from the orifice.

Further, the automatic elastic thread ligation device provided by the present invention further includes a buckling structure which is arranged on the outer wall of the barrel for fixing the thread ejector sleeve, the thread ejector sleeve is arranged along the outer wall of the barrel, and the rear of the thread ejector sleeve is installed in the gun body through a detachable structure; the elastic thread penetrates through the thread ejector sleeve, and the tail end thereof is buckled with the orifice of the rear end of the thread ejector sleeve; the buckling structure is composed of a thread ejector sleeve fixing clip and at least one groove formed in the outer wall of the barrel, the thread ejector sleeve fixing clip is H-shaped, namely, the thread ejector sleeve fixing clip is composed of a transverse plate and a pair of vertical plates, the upper plate surface of the transverse plate is provided with at least one bayonet, and the groove corresponds to the bayonet up and down; necks are formed in both sides of the groove, a clamping hook is arranged at the upper end of the side plate of the thread ejector sleeve fixing clip, the clamping hook is clamped in the necks to install the thread ejector sleeve fixing clip on the barrel, and the groove and the bayonet are oppositely closed to clamp the thread ejector sleeve so as to fix the thread ejector sleeve before the barrel is installed on the gun body.

As an improvement of the present invention, a C-shaped clamping opening is formed in the outer wall of one vertical plate of the thread ejector sleeve fixing clip, the opening of the C-shaped clamping opening is outward, and the traction thread turn button is embedded into the C-shaped clamping opening from the opening to be clamped, so as to fix the traction thread turn button before the barrel is installed on the gun body.

According to the present invention, two upper and lower parallel through holes are formed in the rear end of the barrel, the through hole at the upper side is a tubular plug, one end of a negative pressure pipeline in the gun body stretches out from the front end of the gun body and is provided with a socket, and the plug is hermetically inserted into the socket to communicate the barrel with the negative pressure pipeline; the through hole at the lower side is sealed by a rubber plug, a minipore for enabling the traction thread to pass through is formed in the rubber plug, a wiring groove communicated with an open bore enabling the traction thread turn button to penetrate through is formed in the front end of the gun body, and the traction thread penetrates through the minipore of the rubber plug and extends straightly along the wiring groove to be winded on the traction thread turn button.

As an embodiment of the present invention, a fixture block with a clamping hook is arranged at the rear end of the barrel in the present invention, a clamping hole and a pushing element are arranged at the front end of the gun body, the clamping hook of the fixture block is clamped in the clamping hole, the pushing element is located in an open pore, the pushing element is composed of an elastic arm and a push block connected to the lower end of the elastic arm, the upper end of the elastic arm is connected to the upper edge of the open pore to provide a restoring force to the push block, the push block corresponds to the clamping hook of the fixture block, and the push block is pushed towards the interior of the gun body to enable the push block to shift the clamping hook to deviate the clamping hook from the clamping hole, so as to detachably insert the barrel assembly onto the gun body.

As a further improvement of the present invention, a tensioning column used for tensioning the transmission belt is arranged on the inner wall of the gun body, the tensioning columns are distributed on the peripheral side of the transmission belt, and the tensioning column supports the transmission belt to stably transmit power.

The present invention further provides a thread ejector sleeve popup mechanism used in the above-mentioned automatic elastic thread ligation device, including at least one thread ejector sleeve sleeved on an elastic thread at a stretched state, a thread ejector sleeve release wheel and at least one strip-shaped thread ejector sleeve limiting plate, wherein one thread ejector sleeve is correspondingly clamped and limited at the front end part of each thread ejector sleeve limiting plate, all the thread ejector sleeve limiting plates are arranged in parallel along the longitudinal direction and are collectively hinged on the inner wall of the gun body via the middle part; at least one projection used for prizing the thread ejector sleeve limiting plate is alternately distributed on the circumferential wheel surface of the thread ejector sleeve release wheel, the rotation of each projection with the thread ejector sleeve release wheel corresponds to one thread ejector sleeve limiting plate located above the wheel surface, the thread ejector sleeve release wheel is rotated to enable the projection to lift the rear end part of the corresponding thread ejector sleeve limiting plate, so as to drive the thread ejector sleeve limiting plate to rotate around a hinge shaft thereof, the front end part of the thread ejector sleeve limiting plate drops off to withdraw the limit on the thread ejector sleeve, and the thread ejector sleeve pops up under the restoring force of the elastic thread.

The present invention further provides a barrel assembly used in the automatic elastic thread ligation device, including a barrel, a traction thread, a traction thread turn button, an elastic thread, a thread ejector sleeve and a thread ejector sleeve fixing clip, wherein the rear end of the traction thread penetrates through the rear end port of the barrel and is winded on the traction thread turn button, the front end of the traction thread is folded back on the outer wall of the front end of the barrel after stretching out from the front end port of the barrel; at least one elastic thread is arranged, the elastic thread is arranged along the outer wall of the barrel, an annular sleeve with an adjustable aperture and formed at the front end of the elastic thread is sleeved on the outer wall of the front end of the barrel, and the annular sleeve is connected with the front end of the traction thread; the thread ejector sleeve is arranged on each elastic thread, and the tail end of the elastic thread penetrates through the thread ejector sleeve and is buckled with the orifice at the rear end of the thread ejector sleeve; each thread ejector sleeve is clamped on the barrel through the fixing clip, and the traction thread turn button is clamped on the fixing clip.

Compared with the prior art, the present invention has the following significant advantages in specific use:

(1) According to the present invention, after the annular sleeve at the front end of the elastic thread is sleeved on the target tissue, the aperture of the annular sleeve can be gradually decreased (can be approximately zero) by tightening the elastic thread, so tighter ligation of the target tissue can be achieved, the ulcer surface is extremely small after the target tissue becomes necrotic and falls off, so that the probability of postoperative bleeding is lowered, and meanwhile, other inherent disadvantages (for example, rubber ring slippage occurs after a short period to result in treatment failure, and hemorrhoids block necrosis is incomplete to delay the healing of the ulcer surface, and the like) of the aforementioned rubber ring ligation surgery are avoided.

(2) Since the ligation is extremely tight, and will not slip, so sites ligated on an intestinal wall on the same horizontal plane can be increased (6-8 sites can be ligated, while only 3-4 sites are generally ligated in any previous ligation method), which greatly improves the effect of lifting an anal pad (or lifting a dropped mucous membrane of rectum).

(3) The elastic thread is unlikely to age and fatigue, so that the service life is long, and the ligation effect can be improved.

(4) The barrel, and the thread ejector sleeve, the thread ejector sleeve fixing clip, the traction thread turn button, the elastic thread and the traction thread and the like, which are arranged on the barrel can be combined and assembled to a barrel assembly capable of deviating from the gun body, these barrel assemblies can be conveniently and detachably installed on the gun body as a whole through the barrel, one gun body can be collectively used with a plurality of barrel assemblies, so that the number of hemorrhoids available for ligation is increased, when hemorrhoids exceeding the number of the elastic threads arranged on one barrel assembly need to be ligated, only the barrel assembly needs to be replaced instead of replacing the entire ligation device, so that the economic costs of patients are lowered.

(5) In the present invention, the branch traction threads are symmetrically distributed along the orifice of the emission head, so that a uniform tension can be provided for the elastic thread, and the annular sleeve can be smoothly sleeved on the target tissue.

(6) The automatic elastic thread ligation device provided by the present invention is simple, convenient, time-saving, labor-saving, strong in practicability, and is not only suitable for treating hemorrhoids, but also can be stretched in vivo to treat rectal prolapse, rectal polyp or other applicable anorectal diseases.

(7) The thread ejector sleeve popup mechanism is adopted in the present invention, when popping up the thread ejector sleeve, the thread ejector sleeve release wheel is rotated to enable the projection thereon to lift the thread ejector sleeve limiting plate, so as to withdraw the limit on the thread ejector sleeve, and the acting force applied to the thread ejector sleeve release wheel will not influence the holding stability, therefore the operation is convenient.

DETAILED DESCRIPTION OF PARTICULAR EMBODIMENTS OF THE INVENTION

According to a method for setting elastic threads in a ligation device as shown inFIG. 1toFIG. 9, at least one elastic thread is arranged along the outer wall of a barrel3of the ligation device, three elastic threads are arranged in the embodiment, a thread ejector sleeve1is sleeved on each elastic thread2, the tail end of the elastic thread2penetrates through the thread ejector sleeve1and is knotted to a knot28, and the tail end thereof is buckled with the orifice at the rear end of the thread ejector sleeve1, an annular sleeve21with an adjustable aperture and formed at the front end of the elastic thread2is sleeved on the outer wall of the front end of the barrel3, and at this time, the elastic thread2is at a stretched state; a traction thread on the ligation device penetrates through the barrel, the front end of the traction thread is folded back on the outer pipe wall of the front end of the barrel after stretching out from the barrel, and the rear end of the traction thread is positioned on a corresponding structure; a traction block is arranged on the front end of the traction thread and is located behind the annular sleeve21, and the traction block is clamped with the annular sleeve for achieving the connection and linkage of the traction thread and the annular sleeve; in the embodiment, the traction block is the knot20formed by the traction thread per se. The annular sleeve21is formed by knotting one end of the elastic thread into an adjustable slipknot25in a conventional method, the knotting point of the annular sleeve is a force bearing part propping against the annular sleeve, and when the traction thread is pulled, the traction thread drives the annular sleeve to move towards the orifice of the barrel until the annular sleeve is disengaged from the orifice; a force is applied to the thread ejector sleeve to prop the orifice at the front end of the thread ejector sleeve against the knotting point of the annular sleeve, meanwhile the tail end of the elastic thread is pulled backwards, and the countertraction between the two acting forces enables a gradual decrease of the aperture of the annular sleeve at the front end of the elastic thread.

In other embodiments, as shown inFIG. 10, the annular sleeve21with the adjustable aperture and at the front end of the elastic thread2can also be formed by penetrating a thread fixing bead27through the elastic thread2, and the thread fixing bead27is the force bearing part propping against the annular sleeve21; specifically, the tail end of the elastic thread2penetrates through the thread ejector sleeve1and is knotted to the knot28, the tail end of the elastic thread is buckled with the orifice at the rear end of the thread ejector sleeve1, the front end of the elastic thread2penetrates through the orifice at the front end of the thread ejector sleeve and penetrates through a pore channel29of the thread fixing bead27, a mechanism capable of clamping the elastic thread2is arranged in the pore channel29and only allows the elastic thread to be pulled in a single direction, and this mechanism can be achieved by the existing technical means; and then, the elastic thread2is folded back and penetrates through another pore channel32on the thread fixing bead to form a knot33so as to be clamped at the orifice of the pore channel32.

A neck11is formed in the tail end of the thread ejector sleeve1, and a shiftable clamping projection7is arranged in the neck11to position the thread ejector sleeve1. Specifically, the neck11is formed in the rear of the thread ejector sleeve1, and the rear of the thread ejector sleeve1penetrates through the inner cavity of a gun body5; a slide rail12extending along the transverse direction is arranged on the inner wall of the gun body5, a thread ejector sleeve release button13is installed on the slide rail12and can slide along the slide rail12, and the clamping projection7on the thread ejector sleeve release button13is clamped in the neck11of the thread ejector sleeve1to position the thread ejector sleeve1; the thread ejector sleeve release button13is pressed to deviate the clamping projection7from the neck11, and at this time, the thread ejector sleeve1and the elastic thread2can be detached. The thread ejector sleeve release button13is composed of an elastic arm8, a slide block9and a press panel10; one end of the slide block9and the one end of the elastic arm8are respectively connected to the back surface of the press panel10, and the slide block9is slidably installed on the slide rail12, the clamping projection7is arranged on the top face of the slide block9, the neck11of the thread ejector sleeve1corresponds to the clamping projection7downwards, the other end of the elastic arm8is used as the lower end of the elastic arm to be propped on the inner wall of the gun body5, the original length of the elastic arm8is larger than the length of the slide block9to propel the press panel10, so that when the elastic arm8is deformed, the slide block9moves along the slide rail12to disengage the clamping projection7from the neck11; after the acting force is withdrawn, the thread ejector sleeve release button13resets.

The above-mentioned method can be used in medical instruments, an automatic elastic thread ligation device using the above-mentioned method for setting elastic threads includes a barrel3, an emission head31, a gun body5, a stock22, a traction thread, a reel6arranged at the rear in the gun body5, a negative pressure joint40communicated with the barrel3, at least one elastic thread2, a thread ejector sleeve1and a negative pressure release switch30arranged on the side face of the stock; the above components of the ligation device are made from a medical high-molecular material; wherein the gun body5and the stock22are provided with shells which are connected into a whole, and each shell is composed of two half shells which are butted joint. The cross section of the elastic thread is a circle, with a diameter of 1.0-3.0 mm, and the elastic thread is composed of an inner layer and an outer layer; the inner layer (an elastic strip) is made from a strip-shaped special high-molecular material with high elasticity; the outer layer (a wrapping layer) is a netty woven layer, is wrapped on the surface of the inner layer, is made from the special high-molecular material and can expand with the stretching of the inner layer elastic strip. This special double-layer structure of the elastic thread not only ensures good elasticity, but also can bear strong axial tension without breaking, and when being sleeved on a target tissue, the annular sleeve of the elastic thread at the stretched state can be further tightened to decrease the aperture; in addition, the elastic thread is unlikely to age and fatigue, so that the service life is long, and the ligation effect can be improved.

The emission head31is installed at the front end of the barrel3; the traction thread penetrates through the emission head31, the barrel3and the interior of the gun body5, the rear end thereof is winded on the reel6for positioning the rear end of the traction thread, and the front end thereof stretches out from the orifice of the emission head31and is folded back on the outer wall of the emission head31; the traction thread is also made from the special medical high-molecular material and can bear strong axial tension without breaking; the thread ejector sleeve1is installed and arranged along the outer wall of the barrel3, in the embodiment, three thread ejector sleeves are adopted and are arranged side by side; the rear half part of the thread ejector sleeve1penetrates through a positioning pipe50in the gun body5and is installed in the gun body5through a thread ejector sleeve release mechanism; the elastic thread2penetrates through the thread ejector sleeve1, and the tail end thereof is buckled with the orifice at the rear end of the thread ejector sleeve1, the knot28is formed at the tail end of the elastic thread2to be clamped in the orifice at the rear end of the thread ejector sleeve1, a fixture block can also be clamped in the orifice at the rear end of the thread ejector sleeve1, the front end of the elastic thread2penetrates through the orifice at the front end of the thread ejector sleeve1and is slightly pulled to keep the same at the stretched state, then a slipknot is knotted to form the annular sleeve21with an adjustable aperture, and the annular sleeve is sleeved on the outer pipe wall of the emission head31; a traction block clamped with the annular sleeve21is arranged on the front end of the traction thread, in the embodiment, the traction block is formed by knotting the traction thread per se, the traction thread is located between the annular sleeve21and the outer wall of the emission head31, and the traction block is located behind the annular sleeve21. When the reel6is rotated, the traction thread moves backwards to drive the traction thread and the traction block folded on the pipe wall of the emission head to move forwards along the pipe wall, and the traction block drives the annular sleeve21to move towards the orifice of the emission head31until the annular sleeve is disengaged from the orifice. In the embodiment, the traction thread is composed of a main traction thread and two branch traction threads26, which are interconnected, the other end of the main traction thread is winded on the reel, the other ends of the branch traction threads26stretch out from the emission head31and are symmetrically distributed along the orifice of the emission head to provide a uniform tension to the annular sleeve21, so as to smoothly disengage the annular sleeve21from the orifice of the emission head31and sleeve the annular sleeve on the target tissue.

In the embodiment, the thread ejector sleeve release mechanism includes three slide rails12and three thread ejector sleeve release buttons13; the slide rail12is transversely arranged on the inner wall of the gun body5along the inner cavity of the gun body5; the thread ejector sleeve release button13is slidably installed on the slide rail12; a clamping projection7is arranged on the thread ejector sleeve release button13, a neck11is formed in the rear of the thread ejector sleeve1, and the clamping projection7is clamped in the neck11; the arrangement positions (alternating along the transverse direction) of the clamping projections on the three thread ejector sleeve release buttons are different, and the clamping projection7on each thread ejector sleeve release button13is matched with one neck11on the thread ejector sleeve1on a corresponding position; for the convenience of production and installation, three necks11are formed in each thread ejector sleeve1, namely, only the necks11corresponding to the clamping projections7on the thread ejector sleeve release buttons13are used. The thread ejector sleeve release button13is integrally made from a press panel10, a rectangular elastic arm8and a slide block9, one end of the slide block9and the one end of the elastic arm8are respectively connected to the back surface of the press panel10, and the slide block is located above the elastic arm, convex edges are arranged on both sides of the slide block9, a groove is formed in the slide rail12, and the convex edges of the slide block9are located in the groove of the slide rail12to achieve the slide connection of the slide block and the slide rail; the clamping projection7is located on the top face of the slide block9, the neck11of the thread ejector sleeve1corresponds to the clamping projection7downwards; the other end of the elastic arm8is used as the lower end of the elastic arm to be propped on the inner wall of the gun body5, the original length of the elastic arm8is larger than the length of the slide block9, and the press panel is located on the side face of the gun body for receiving a press force. Wherein, the elastic arm8is a bent sheet body, a convex limiting strip (not drawn in the figures) is arranged on the inner wall of the gun body5along the length direction thereof, the convex limiting strip is located below the elastic arm8, and the rear end of the elastic arm8is clamped on the convex limiting strip. When no force is applied to the press panel10, the elastic restoring force of the elastic arm jacks the clamping projection7in the neck11; when the press panel10is pressed, the elastic arm8is compressed, meanwhile the convex limiting strip limits the rear end of the elastic arm8, the slide block9moves along the slide rail12to disengage the clamping projection7from the neck11, and at this time, the positioning of the thread ejector sleeve1is withdrawn; when the acting force is withdrawn, the thread ejector sleeve release button13resets.

A negative pressure pipeline is arranged in the gun body5and the stock22, and the negative pressure pipeline is composed of a first negative pressure pipe23located in the gun body and a second negative pressure pipe24located in the stock, which are communicated; wherein the first negative pressure pipe23is communicated with the barrel3, the reel6is located behind the first negative pressure pipe23, and the traction thread is winded on the reel after being led out by the emission head31, the barrel3and the first negative pressure pipe23; a negative pressure release hole is formed in the second negative pressure pipe24, and a plugging block used for plugging the negative pressure release hole is arranged on a negative pressure release switch30; a negative pressure joint40is arranged at the tail end of the second negative pressure pipe24, when a negative pressure suction system connected with the negative pressure joint40is opened, and the negative pressure release switch30is at a closed state, namely, the plugging block plugs the negative pressure release hole, the entire negative pressure pipeline, the barrel3and the inner cavity of the emission head31generate enough negative pressure to enable the opening end of the emission head31to suck the target tissue; after the ligation operation is finished, the negative pressure release switch30is opened to depart the plugging block from the negative pressure release hole, so as to eliminate the negative pressure in the pipeline to release the sucked target tissue.

It is taken as an example that the automatic elastic thread ligation device in embodiment 1 of the present invention is used as a medical instrument for ligating hemorrhoids tissues, the use working process thereof is as follows: the negative pressure joint is communicated with the negative pressure suction system at first, and the negative pressure release switch is closed; a handle is held by a hand to align the orifice of the emission head to the hemorrhoids tissue (or other target tissues); the negative pressure suction system is opened, and the hemorrhoids tissue is sucked into the orifice of the emission head; at this time, the reel is shifted by a finger to tow the traction thread to move backwards, under the action of a tractive force, the traction thread and the traction block distributed along the pipe wall of the emission head move towards the orifice of the emission head and drive the annular sleeve of the elastic thread to move towards the orifice until the annular sleeve is disengaged from the orifice of the emission head, and at this time, the hemorrhoids tissue is sleeved; the negative pressure release switch is opened to eliminate the negative pressure and release the ligated hemorrhoids tissue; the thread ejector sleeve release button is pressed to release the thread ejector sleeve, and the thread ejector sleeve is pulled out; a force is applied to the thread ejector sleeve to prop the orifice at the front end of the thread ejector sleeve against the knotting position of the annular sleeve and the hemorrhoids tissue at the position, and then the elastic thread at the orifice at the rear end of the thread ejector sleeve is pulled at the same time, the countertraction thereof further tightens the elastic thread and further decreases the aperture of the annular sleeve (at this time the aperture of the annular sleeve can be decreased to approximately zero), so as to further tighten the hemorrhoids tissue, and one ligation operation is finished. The next position is ligated with the same method, and ligation operations for three or more times can be continuously finished similarly.

Since the automatic elastic thread ligation device fastens and ligates the hemorrhoids tissue, after the hemorrhoids fall off, the ulcer surface is extremely small, so that the probability of postoperative bleeding of the ligation of hemorrhoids is reduced, and meanwhile, other inherent disadvantages (for example, rubber ring slippage occurs after a short period of the surgery to result in treatment failure; hemorrhoids block necrosis is incomplete to delay the healing of the ulcer surface, and the like) of the aforementioned rubber ring ligation are avoided.

When detecting the air tightness of the ligation device provided by the present invention, the negative pressure joint of the ligation device is connected to an external negative pressure suction system, meanwhile an exhaust vent switch is opened, the opening end of the emission head is plugged, and the negative pressure suction system is opened, and if the pointer of a negative pressure meter at least points to −0.08 MPa, the air tightness is qualified.

Embodiment 2 is a preferred embodiment of the present invention, and the main difference with embodiment 1 lies in that the barrel3is detachably installed on the gun body5, a traction thread36is connected to a driving wheel61located at the rear of the gun body5through a transfer transmission mechanism, and when needing to pull the traction thread, the driving wheel61pulls backwards the traction thread through the transfer transmission mechanism (seeFIG. 11toFIG. 18). Meanwhile, the thread ejector sleeve is inserted into the gun body through a thread ejector sleeve popup mechanism (seeFIG. 19toFIG. 31).

In the embodiment, as shown inFIG. 11toFIG. 18, the transfer transmission mechanism includes a traction thread turn button34, a transfer shaft35and a transmission belt37, wherein the transfer shaft35is transversely arranged at the front end in the gun body5, the rear end of the transmission belt37is winded on the driving wheel61located at the rear in the gun body5, the front end of the transmission belt37is sleeved on the inner end of the transfer shaft35, the traction thread turn button34is sleeved on the outer end of the transfer shaft35, the traction thread turn button34is engaged with the sleeving position of the transfer shaft35, the rear end of the traction thread is winded on the front end of the traction thread turn button34, the rear end of the traction thread turn button34stretches out from the gun body5to assemble and dissemble the same, the driving wheel61is shifted clockwise to drive the transfer shaft to rotate through the transmission belt, so that the traction thread turn button rotates for winding the thread to pull the traction thread backwards, so as to drive the annular sleeve to move towards the orifice of the barrel until the annular sleeve is disengaged from the orifice.

A buckling structure is arranged on the outer wall of the barrel3, the buckling structure is composed of a thread ejector sleeve fixing clip38and at least one groove39formed in the outer wall of the barrel3, the thread ejector sleeve fixing clip38is H-shaped, namely, the thread ejector sleeve fixing clip38is composed of a transverse plate43and a pair of vertical plates44, the upper plate surface of the transverse plate43is provided with at least one bayonet, and the groove39corresponds to the bayonet up and down; necks are formed in both sides of the groove39, a clamping hook is arranged at the upper end of the side plate of the thread ejector sleeve fixing clip38, the clamping hook is clamped in the necks to install the thread ejector sleeve fixing clip38on the barrel3, and the groove and the bayonet are oppositely closed to clamp the thread ejector sleeve so as to fix the thread ejector sleeve before the barrel is installed on the gun body. A C-shaped clamping opening47is formed in the outer wall of one vertical plate of the thread ejector sleeve fixing clip38, the opening of the C-shaped clamping opening47is outward, and the traction thread turn button34is embedded into the C-shaped clamping opening47from the opening to be clamped, so as to fix the traction thread turn button before the barrel is installed on the gun body. In this way, the above-mentioned barrel, and the thread ejector sleeve, the elastic thread, the thread ejector sleeve fixing clip, the traction thread turn button and the traction thread and the like, which are arranged on the barrel, can be combined and assembled to a barrel assembly.

Two upper and lower parallel through holes are formed in the rear end of the barrel3, the through hole at the upper side is a tubular plug48, one end of a negative pressure pipeline60in the gun body5stretches out from the front end of the gun body5and is provided with a socket62, and the plug48is hermetically inserted into the socket62to communicate the barrel3with the negative pressure pipeline60, the negative pressure pipeline60is composed of a first negative pressure pipe23located in the gun body5and a second negative pressure pipe24located in the stock, which are communicated, the rear end of the first negative pressure pipe23is sealed, specifically: the plug48is communicated with the first negative pressure pipe23, the driving wheel61is located behind the first negative pressure pipe23, the first negative pressure pipe23is located above the transmission belt37, and the negative pressure pipeline60is located on the side of the transmission belt. The through hole at the lower side is sealed by a rubber plug51, a minipore52for enabling the traction thread to pass through is formed in the rubber plug51, a wiring groove53communicated with an open bore enabling the traction thread turn button34to penetrate through is formed in the front end of the gun body5, and the traction thread penetrates through the minipore52of the rubber plug51and extends straightly along the wiring groove53to be winded on the traction thread turn button34. A tensioning column58used for tensioning the transmission belt37is arranged on the inner wall of the gun body5, the tensioning column58is distributed on the peripheral side of the transmission belt37, and the tensioning column58supports the transmission belt37to stably transmit power. Therefore, the negative pressure pipeline in the embodiment is completely separate from the wiring path of the traction thread.

A fixture block54with a clamping hook is arranged at the rear end of the barrel3, a clamping hole55and a pushing element are arranged at the front end of the gun body5, the clamping hole55is located on the front end face of the gun body5and is communicated with the interior of the gun body, the clamping hook of the fixture block54is clamped in the clamping hole55, the pushing element is located on the side of the through hole at the lower side of the gun body, an open pore communicated with the interior of the gun body is formed in the side wall of the front end of the gun body5, the pushing element is located in the open pore, the pushing element is composed of an elastic arm56and a push block57connected to the lower end of the elastic arm, the upper end of the elastic arm56is connected to the upper edge of the open pore to provide a restoring force to the push block57, the push block57corresponds to the clamping hook of the fixture block54, and the push block is pushed towards the interior of the gun body to enable the push block to shift the clamping hook to deviate the clamping hook from the clamping hole, so as to detachably insert the barrel assembly onto the gun body. In this way, by means of the above-mentioned structure on the rear end of the barrel, the barrel assembly can be conveniently detached from or installed on the gun body as a whole, and one gun body is collectively used with a plurality of barrel assemblies.

In the embodiment, as shown inFIG. 19toFIG. 31, the thread ejector sleeve popup mechanism includes a thread ejector sleeve release wheel14arranged on the gun body and at least one strip-shaped thread ejector sleeve limiting plate16, in the embodiment, three thread ejector sleeves1are arranged, are installed and arranged along the outer wall of the barrel3and are arranged side by side; correspondingly, three strip-shaped thread ejector sleeve limiting plates16are arranged, one thread ejector sleeve1is correspondingly clamped and limited at the front end part of each thread ejector sleeve limiting plate16, the thread ejector sleeve release wheel14is rotatably installed at the lower part of the gun body5, the three strip-shaped thread ejector sleeve limiting plates16are distributed in parallel along the longitudinal direction and are collectively hinged on the inner wall of the gun body5of the ligation device via the middle parts, at least one projection18used for prizing the thread ejector sleeve limiting plate16is alternately distributed on the wheel surface17of the thread ejector sleeve release wheel14, in the embodiment, three projections18are arranged, the rotation of each projection18with the thread ejector sleeve release wheel14corresponds to one thread ejector sleeve limiting plate16located above the wheel surface, the thread ejector sleeve release wheel14is rotated to enable the projection18to lift the rear end part of the corresponding thread ejector sleeve limiting plate16, so as to drive the thread ejector sleeve limiting plate16to rotate around a hinge shaft67thereof, meanwhile, the front end part of the thread ejector sleeve limiting plate16drops off to withdraw the limit on the thread ejector sleeve1, and the thread ejector sleeve1pops up under the restoring force of the elastic thread2. The front end of the elastic thread2is knotted into a slipknot to form the annular sleeve21with the adjustable aperture, the annular sleeve is sleeved on the emission head31of the automatic elastic thread ligation device, the front end head68of the popping out thread ejector sleeve can prop against the knotting position69of the elastic thread2to carry out a ligation operation.

A fixture block19is arranged at the front end part of the thread ejector sleeve limiting plate16, a clamping joint41connected with the tail end of the elastic thread2is inserted into the orifice at the rear end of the thread ejector sleeve1, a limiting groove42is formed on the clamping joint41, and the fixture block19is clamped in the limiting groove42to limit the rear of the thread ejector sleeve1in the gun body5. The clamping joint41is mainly composed of a columnar inner segment45inserted into the orifice at the rear end of the thread ejector sleeve1and an outer segment46stretching out from the thread ejector sleeve1, the limiting groove42is annularly formed in the spindle-shaped outer segment46, a neck49is formed in the upper end of the fixture block19, the notch of the neck49is upward, the outline thereof is applicable to the outline of the bottom of the limiting groove42, in the embodiment, the bottom of the limiting groove42is a cambered surface, the notch of the neck49is circular arc-shaped, and the neck is clamped in the limiting groove.

A lumpish rear supporting seat59used for being inserted into the outer segment of the clamping joint and a front supporting seat63used for guiding the thread ejector sleeve1to install the same in the gun body5of the ligation device can also be arranged, the two supporting seats are arranged on the inner wall of the gun body5at front and back, and the fixture block19of the thread ejector sleeve limiting plate16is located on the front side of the rear supporting seat59. The rear of the thread ejector sleeve1stretches into the rear supporting seat59after penetrating through the front supporting seat63. An elastic arm64obliquely extends from the lower side of the fixture block19at the front end part of the thread ejector sleeve limiting plate16, the elastic arm64can form an included angle larger than 120 degrees with the thread ejector sleeve limiting plate16, a longitudinal supporting column65is arranged in front of the elastic arm64, the front end of the elastic arm64is propped on the supporting column65for providing an upward acting force to jack the fixture block19of the thread ejector sleeve limiting plate16in the limiting groove42of the clamping joint41and resetting the prized projection of the thread ejector sleeve limiting plate at the same time.

Markers66used for marking the thread ejector sleeves are arranged on the circumference of the side face of the thread ejector sleeve release wheel14, the markers are numbers “0, 1, 2, 3”, the marker “0” indicates that the rotating wheel is located at an original starting point, and the markers “1, 2, 3” respectively indicate that one projection on the wheel surface jacks the position of the rear end part of the corresponding thread ejector sleeve limiting plate, so as to master the popup conditions of the thread ejector sleeves.

SeeFIG. 20toFIG. 24, they show that the projection18on the thread ejector sleeve release wheel14does not lift the thread ejector sleeve limiting plate16, at this time, the marker “0” on the thread ejector sleeve release wheel14indicates that the thread ejector sleeve release wheel14is located at an original starting point, and no projection on the wheel surface17lifts the thread ejector sleeve limiting plate. SeeFIG. 25andFIG. 26, the thread ejector sleeve release wheel14is rotated to make the projection18jack the corresponding thread ejector sleeve limiting plate16, meanwhile, the elastic arm64of the thread ejector sleeve limiting plate16is propped on the supporting column65to deform, with the continuous rotation of the thread ejector sleeve release wheel14, the acting force applied by the projection18to the thread ejector sleeve limiting plate16is withdrawn, the thread ejector sleeve limiting plate16resets through the elastic restoring force of the elastic arm64, when the thread ejector sleeve is inserted, the elastic arm deforms, and when the limiting groove of the clamping joint corresponds to the fixture block of the thread ejector sleeve limiting plate (i.e., the thread ejector sleeve is installed in place), the fixture block of the thread ejector sleeve limiting plate is clamped in the limiting groove through the elastic restoring force of the elastic arm.

The use process of the embodiment is as follows: as shown inFIG. 19, a complete ligation device is assembled, when the thread ejector sleeve needs to pop up for ligation, the thread ejector sleeve fixing clip is taken off, the thread ejector sleeve release wheel is rotated from the position of the marker “0” to the position of the marker “1”, one projection on the wheel surface lifts the rear end part of the corresponding thread ejector sleeve limiting plate, the thread ejector sleeve limiting plate is driven to rotate around the hinge shaft thereof, the front end part of the thread ejector sleeve limiting plate falls off to disengage the notch of the fixture block from the limiting groove, so as to withdraw the limit on the thread ejector sleeve, and the thread ejector sleeve is applied with the restoring force of the elastic thread at the stretched state, so that the rear end part of the thread ejector sleeve stretching in vivo pops up from the gun body. After the thread ejector sleeve pops up, the driving wheel is shifted by a finger to tow the traction thread to move backwards, under the action of the tractive force, the traction thread and the traction block distributed along the pipe wall of the emission head move towards the orifice of the emission head and drive the annular sleeve of the elastic thread to move towards the orifice until the annular sleeve is disengaged from the orifice of the emission head, and at this time, the hemorrhoids tissue is sleeved. At this time, a thread ejector sleeve assembly (including the thread ejector sleeve, the elastic thread, the annular sleeve at the head end of the elastic thread and the clamping joint at the tail end of the elastic thread) is completely dissociative. The front end of the dissociative thread ejector sleeve is propped against the force bearing part of the annular sleeve forwards, meanwhile, the clamping joint inserted into the orifice at the rear end of the thread ejector sleeve is pulled out from the columnar inner segment, so as to pull the traction thread backwards, and the countertraction between the two forces decreases the aperture of the annular sleeve gradually until the aperture becomes approximately zero, so as to firmly tighten the hemorrhoids tissue (or other target tissues); the negative pressure release switch is opened to eliminate the negative pressure and release the ligated hemorrhoids tissue from the emission head, and one ligation operation is finished. When the next thread ejector sleeve needs to pop up, the thread ejector sleeve release wheel is sequentially rotated to the positions of the markers “2, 3”.

After the elastic threads of the above-mentioned barrel assembly are used up, and when needing to continue to use the elastic threads to carry out the ligation operation, the barrel assembly with the elastic threads used up can be detached; a new barrel assembly with elastic threads is installed on the gun body, meanwhile, the elastic threads penetrate through the front supporting seat to stretch into the gun body, in a stretching process, the outer segment of the clamping joint connected with the tail end of the elastic thread presses the fixture block to deform the elastic arm, the limiting groove of the clamping joint is clamped with the corresponding notch of the fixture block of the thread ejector sleeve limiting plate, the fixture block of the thread ejector sleeve limiting plate is clamped in the limiting groove by the elastic restoring force of the elastic arm, the tail end of the outer segment stretches into the rear supporting seat, and in this way, the thread ejector sleeve is installed in place. The traction thread turn button is sleeved on the transfer shaft, the thread ejector sleeve fixing clip is taken off, and then the above-mentioned ligation operation can be restarted.

The main difference of embodiment 3 over embodiment 1 lies in that the thread ejector sleeve is inserted into the gun body through a thread ejector sleeve popup mechanism, instead of the manner in embodiment 1 that the thread ejector sleeve is installed in the gun body through the thread ejector sleeve release mechanism. The specific composition, the connection relationship and the action process (seeFIG. 20toFIG. 31) of the thread ejector sleeve popup mechanism are the same as those of the thread ejector sleeve popup mechanism in embodiment 2, and will not be repeated redundantly herein. The ligation process in the embodiment is similar to that in embodiment 1, but only the operations of releasing the thread ejector sleeve are different.

In addition, a detachable installation structure of the barrel and the gun body in embodiment 2 can be combined into embodiment 1 to replace the integral connection of the barrel and the gun body in embodiment 1, and the ligation device (not shown in the figures) of another embodiment can be combined and connected to achieve the technical effects of the present invention as well.

The components in the embodiments of the above-mentioned ligation device can also be made from metals or other materials; at least two branch traction threads are arranged and are symmetrically distributed along the orifice of the emission head to provide a uniform tension to the annular sleeve of the elastic thread, so as to smoothly sleeve the annular sleeve on the target tissue; the connection between the traction thread and the annular sleeve can also be achieved in other manners; the tail end of the elastic thread penetrates through the thread ejector sleeve, and the tail end thereof can also be buckled with the orifice at the rear end of the thread ejector sleeve through the fixture block.

The embodiments of the present invention are not limited hereto, according to the above-mentioned contents of the present invention, in accordance with common technical knowledge and common means in the art, and on the premise of not departing from the above-mentioned basic technological ideas of the present invention, 1-3 or more thread ejector sleeves and elastic threads can be adopted in the present invention, and the matched components are correspondingly increased; the specific structures of the parts and components of the thread ejector sleeve popup mechanism of the automatic elastic thread ligation device provided by the present invention have other embodiments; the number of the thread ejector sleeve limiting plates and the projections on the thread ejector sleeve release wheel can be set according to the demand of the ligation device; therefore, a variety of other equivalent modifications, substitutions or combinations can also be made in the present invention, and these equivalent modifications, substitutions or combinations shall fall within the protection scope of the present invention.