CN212630834U

CN212630834U - Elastic line pushing assembly and ligation device using same

Info

Publication number: CN212630834U
Application number: CN202021109249.3U
Authority: CN
Inventors: 张焱
Original assignee: Jiangsu Annuoruike Medical Devices Co ltd
Current assignee: Jiangsu Annuoruike Medical Devices Co ltd
Priority date: 2020-06-16
Filing date: 2020-06-16
Publication date: 2021-03-02
Anticipated expiration: 2030-06-16

Abstract

The utility model discloses an elasticity line promotes subassembly and uses this elasticity line to promote ligation device of subassembly, include: the tooth-shaped limiting group is arranged on the negative pressure bin sucking head of the ligation device and is suitable for limiting a plurality of elastic lines sleeved on the negative pressure bin sucking head; the tooth-shaped pushing group is arranged on the end part of the outer tube of the ligation device close to the negative pressure suction cabin head; the tooth-shaped pushing group is in plug-in fit with the tooth-shaped limiting group; when the outer tube moves axially relative to the inner tube of the ligation device, the tooth-shaped pushing group is suitable for moving axially relative to the tooth-shaped limiting group to push the elastic wire.

Description

Elastic line pushing assembly and ligation device using same

Technical Field

The utility model relates to a medical device technical field especially relates to an elasticity line promotes subassembly and uses this elasticity line to promote ware of bundling of subassembly.

Background

At least one elastic line is additionally arranged on the outer wall of the gun barrel of the ligation device, and the front end of the elastic line forms an adjustable-aperture ring sleeved on the outer wall of the front end of the gun barrel; connecting a traction wire on the ligation device with a ring sleeve of an elastic wire, and driving the ring sleeve to move towards the opening of the gun barrel by the traction wire until the opening is removed when the traction wire is pulled; the elastic thread is pushed forward to the force applying part of the ring sleeve at the front end of the elastic thread, and the tail end of the elastic thread is pulled, so that the two acting forces resist the traction to gradually reduce the diameter of the ring sleeve at the front end of the elastic thread.

Patent publication No. CN10948116A discloses a ligation device, which comprises an elastic thread and a push ring sleeved on a negative pressure suction cabin head. The patent also discloses that a ligation device can realize the release of a plurality of elastic threads to ligate tissues to be ligated by arranging a plurality of push rings. Although the ligation device disclosed in this patent can realize the pushing of the plurality of elastic threads by the plurality of push rings, each two adjacent push rings are completely independent structures and are not directly connected with each other, when the plurality of elastic threads are pushed, the elastic threads are sequentially released in the sequence from the far-hand end to the near-hand end, and when the pushing of the elastic thread at the far-hand end is completed and then another adjacent elastic thread needs to be pushed, the push ring having released the elastic thread needs to be pushed out first, so that the push ring corresponding to the elastic thread to be released can approach the tissue with ligation, in summary, in the process of sequentially pushing the plurality of elastic threads, the push rings need to be pushed out in sequence, and the push rings pushed out one by one can cause the pushing efficiency of the elastic thread and the obstruction in the ligation operation to a certain extent, due to the existence of the push ring for limiting the elastic wire which releases the far hand end, the elastic wire to be released at the back is difficult to be tightly attached to the root of the tissue to be bound, so that the maximization of the tissue to be bound is difficult to be ensured.

SUMMERY OF THE UTILITY MODEL

The utility model discloses a first purpose provides an elastic line promotes subassembly to solve the propulsive technical problem of the progressive formula that realizes each elastic line.

The second purpose of the utility model is to provide a ligation device to solve and realize improving the technical problem of elastic wire release and ligation efficiency.

The utility model discloses an elasticity line promotes subassembly is realized like this:

an elastic wire pushing assembly adapted for use with a ligation device, comprising:

the tooth-shaped limiting group is arranged on the negative pressure bin sucking head of the ligation device and is suitable for limiting a plurality of elastic lines sleeved on the negative pressure bin sucking head;

the tooth-shaped pushing group is arranged on the end part, close to the negative pressure suction bin head, of the outer tube of the ligation device; the tooth-shaped pushing group is in plug-in fit with the tooth-shaped limiting group; when the outer tube moves axially relative to the inner tube of the ligation device, the tooth-shaped pushing group is suitable for moving axially relative to the tooth-shaped limiting group to push the elastic wire.

In a preferred embodiment of the present invention, the tooth-shaped limiting group includes at least three tooth-shaped limiting rings with the same structure, which are sequentially and alternately distributed on the outer side wall of the negative pressure suction head along a direction parallel to the axis thereof;

each tooth-shaped limiting ring comprises at least two first conical teeth which are convexly arranged at intervals along the circumferential direction of the negative pressure suction bin head; an axial groove is formed between adjacent first conical teeth of the same tooth-shaped limiting ring.

In a preferred embodiment of the present invention, the tooth-shaped pushing group comprises at least two tooth-shaped pushing rings with the same structure, which are sequentially and alternately distributed on the outer side wall of the outer tube along a direction parallel to the axis thereof;

each tooth-shaped pushing ring comprises at least two second conical teeth which are arranged at intervals in a protruding mode in the circumferential direction of the outer pipe; an axial notch is formed in the side wall of the outer pipe and between the adjacent second conical teeth of the same tooth-shaped pushing ring along the direction parallel to the axis of the outer pipe;

the second conical tooth is suitable for being in inserted fit with the axial groove, and the first conical tooth is suitable for being in inserted fit with the axial notch.

In a preferred embodiment of the present invention, the outer diameter of the first conical tooth gradually increases along the proximal end toward the distal direction;

the second tapered teeth have an outer diameter that increases in a direction toward the distal means along the proximal end.

In a preferred embodiment of the present invention, the tooth-shaped limiting set comprises three tooth-shaped limiting rings with the same structure;

the tooth-shaped limiting ring comprises four first conical teeth which are uniformly distributed along the circumferential direction of the negative pressure suction cabin head and have the same structure; the axial groove is formed between every two adjacent first conical teeth of the same tooth-shaped limiting ring; and

the tooth-shaped pushing group comprises two tooth-shaped pushing rings with the same structure;

the tooth-shaped pushing ring comprises four second conical teeth which are uniformly distributed along the circumferential direction of the outer pipe and have the same structure, and the axial notch is formed between every two adjacent second conical teeth of the same tooth-shaped pushing ring.

In a preferred embodiment of the present invention, four second tapered teeth included in one of the toothed pushing rings and four first tapered teeth included in one of the toothed limiting rings are adapted to form a radial cross section of 360 degrees together after being engaged.

In the preferred embodiment of the present invention, when a tooth-shaped pushing ring is disposed on the radial surface of a tooth-shaped limiting ring, the four second conical teeth included in the tooth-shaped pushing ring are adapted to be disposed on the circumferential side wall of the four first conical teeth included in the tooth-shaped limiting ring.

The utility model discloses a ligation device is realized like this:

a ligation device, comprising: the elastic line pushing assembly, the plurality of line pushing rods which are connected with the plurality of elastic lines in a one-to-one correspondence mode and are suitable for tightening the elastic lines, and the ejection mechanism which is matched and connected with the plurality of line pushing rods and is suitable for ejecting the line pushing rods.

In a preferred embodiment of the present invention, the wire pushing rod comprises a pushing rod part and a pull rod cap connected in a matching manner; wherein the push rod part is provided with a bunching channel suitable for bunching elastic lines;

the pull rod cap is connected with one end of the elastic wire passing through the bunching channel so as to be suitable for pulling the elastic wire; and

the ejection mechanism comprises an ejection box, a rod piece accommodating groove arranged in the ejection box and an ejection roller suitable for pushing the wire pushing rod.

In a preferred embodiment of the present invention, the ejecting roller includes a cylindrical rotating body, and a plurality of ejecting teeth of the wire pushing rod are provided on a side wall of the cylindrical rotating body in sequence along a circumferential surface of the cylindrical rotating body in a one-to-one correspondence.

By adopting the technical scheme, the utility model discloses following beneficial effect has: the utility model discloses an elastic line promotes subassembly and uses this elastic line to promote ligation device of subassembly, promote the in-process that group and the spacing group plug-in fit of profile of tooth are realized releasing the release with the elastic line more through the profile of tooth, can realize the promotion of progressive, the elastic line at each far-hand end is released the in-process of release promptly, the elastic line that links to each other with this elastic line is promoted the position to the elastic line of release already by the release of far-hand end promptly, the process of presenting the recursion promptly, make each elastic line that is released the release all can be in the position of the overhead farthest hand end of negative pressure suction storehouse, just so improved every elastic line in the in-process of releasing and treat the maximize contact effect between the tissue of ligation, reduce the hindrance of negative pressure suction storehouse head to the contact between the tissue of elastic line and banding.

Drawings

FIG. 1 is a schematic view of the overall structure of the ligation device of the present invention;

FIG. 2 is an enlarged view of portion A of FIG. 1;

fig. 3 is a schematic structural view of the elastic thread pushing assembly of the present invention in an initial state;

fig. 4 is a schematic structural view of the elastic thread pushing assembly of the present invention during the process of pushing the elastic thread;

fig. 5 is a schematic structural view of the elastic thread pushing assembly of the present invention in a state where the tooth-shaped limiting group and the tooth-shaped pushing group are engaged with each other;

fig. 6 is a first view structural diagram of an ejection box of the ligation device according to the present invention;

fig. 7 is a second view structural diagram of the ejection box of the ligation device according to the present invention;

fig. 8 is a first view of the tooth-shaped spacing ring of the elastic thread pushing assembly according to the present invention;

fig. 9 is a second view of the tooth-shaped spacing ring of the elastic thread pushing assembly according to the present invention;

fig. 10 is a schematic structural view of a tooth-shaped pushing ring of the elastic thread pushing assembly according to the present invention.

In the figure: the negative pressure cabin suction head comprises a negative pressure cabin suction head 1, an outer pipe 2, an elastic line 3, a first conical tooth 5, an axial groove 6, a first annular tooth 7, a second conical tooth 8, an axial notch groove 9, a supporting column 10, a push rod part 11, a pull rod cap 12, an ejection box 13, an opening 15, a rod piece accommodating groove 16, a columnar rotating body 17 and a pushing tooth 18.

Detailed Description

In order that the present invention may be more readily and clearly understood, the following detailed description of the present invention is provided in connection with the accompanying drawings.

Example 1:

referring to fig. 1 to 5 and 8 to 10, the present embodiment provides an elastic thread 3 pushing assembly suitable for a ligation device, comprising: the tooth-shaped pushing group and the tooth-shaped limiting group are suitable for being matched in an inserting mode. The tooth-shaped limiting group is arranged on a negative pressure suction bin head 1 of the ligation device so as to be suitable for limiting a plurality of elastic wires 3 sleeved on the negative pressure suction bin head 1. And the tooth-shaped pushing group is arranged at the end part of the outer tube 2 close to the negative pressure suction cabin head 1, and when the outer tube 2 moves axially relative to the inner tube of the ligation device, the tooth-shaped pushing group is suitable for generating axial movement relative to the tooth-shaped limiting group so as to push the elastic line 3.

The tooth shape limit group and the tooth shape urging group of the present embodiment are described in detail below.

Firstly, a tooth profile limit group:

the tooth-shaped limiting group comprises at least three tooth-shaped limiting rings which are same in structure and are distributed on the outer side wall of the negative pressure suction cabin head 1 in sequence at intervals along the direction parallel to the axis of the negative pressure suction cabin head, and the tooth-shaped limiting rings are preferably uniformly distributed.

Since each of the castellated stop collars has the same structure, the specific structure thereof will be described below with reference to a specific castellated stop collar. Specifically, each tooth-shaped limiting ring comprises at least two first conical teeth 5 which are convexly arranged at intervals along the circumferential direction of the negative pressure suction bin head 1; an axial groove 6 is formed between adjacent first conical teeth 5 of the same toothed limiting ring. It should be noted here that for the first conical teeth 5 included in different toothed stop rings, the plurality of first conical teeth 5 included in different toothed stop rings are distributed in a one-to-one correspondence manner, that is, the axial grooves 6 formed by the first conical teeth 5 of different toothed stop rings form a through structure, that is, the strip-shaped axial grooves 6 are formed on the outer side wall of the negative pressure suction chamber head 1.

Secondly, a tooth shape limit group:

the tooth-shaped pushing group comprises at least two tooth-shaped pushing rings which are distributed on the outer side wall of the outer tube 2 in sequence along the direction parallel to the axis of the outer tube at intervals and have the same structure; each tooth-shaped pushing ring comprises at least two second conical teeth 8 which are arranged at intervals in a protruding mode along the circumferential direction of the outer pipe 2; an axial notch 9 is arranged on the side wall of the outer tube 2 and between the adjacent second conical teeth 8 of the same tooth-shaped pushing ring along the direction parallel to the axis of the outer tube 2; the second conical tooth 8 is adapted to be interfitting with the axial groove 6 and the first conical tooth 5 is adapted to be interfitting with the axial slot 9. It should be noted here that, for the second conical teeth 8 included in the different toothed pushing rings, the plurality of second conical teeth 8 included in the different toothed pushing rings are distributed in a one-to-one correspondence, that is, for the axial notches 9 formed by the second conical teeth 8 of the different toothed pushing rings, a through structure is formed, that is, the axial notches 9 in a strip-shaped structure are formed in the side wall of the outer tube 2. It should be noted that, in particular, for the axial grooves 9 of the strip-shaped structure formed on the side wall of the outer tube 2, the axial length of the axial grooves 9 of the strip-shaped structure is greater than the total axial length of all the tooth-shaped thrust rings on the outer tube 2, and the significance of the design is that during the axial movement of the outer tube 2 relative to the inner tube, the axial grooves 9 of the strip-shaped structure can provide enough space for the tooth-shaped thrust rings to synchronously generate the axial movement relative to the negative pressure suction cabin head 1.

Taking a concrete case as an example, the tooth-shaped limiting group comprises three tooth-shaped limiting rings with the same structure; each tooth-shaped limiting ring comprises four first conical teeth 5 which are uniformly distributed along the circumferential direction of the negative pressure suction cabin head 1 and have the same structure; an axial groove 6 is formed between every two adjacent first conical teeth 5 of the same tooth-shaped limiting ring. The corresponding tooth-shaped pushing group comprises two tooth-shaped pushing rings with the same structure; the tooth-shaped progressively-pushing ring comprises four second conical teeth 8 which are uniformly distributed along the circumferential direction of the outer pipe 2 and have the same structure, and an axial notch 9 is formed between every two adjacent second conical teeth 8 of the same tooth-shaped progressively-pushing ring.

In addition, it should be further noted that, for the tooth-shaped limiting group of the present embodiment, a bottom supporting ring is further included on the negative pressure suction head 1, the bottom supporting ring is disposed on one side close to the hand, of one tooth-shaped limiting ring located at the proximal end of the three tooth-shaped limiting rings, the bottom supporting ring includes first annular teeth 7, which are uniformly distributed along the circumferential direction of the negative pressure suction head 1 and have the same number as the first conical teeth 5 included in the tooth-shaped limiting ring, and the first annular teeth 7 are disposed in one-to-one correspondence with the first conical teeth 5, and the axial grooves 6 extend along to between the adjacent first annular teeth 7. In addition, the axial distance between the backing ring and the first conical tooth 5 closest to the backing ring can be selected to be equal to the axial distance between every two adjacent toothed spacing rings from the axial direction parallel to the axial direction of the negative pressure suction cabin head 1. For example, three tooth-shaped limiting rings are matched with one bottom supporting ring, so that three sleeving areas suitable for sleeving the elastic threads 3 can be formed together.

For the side wall of the part of the outer tube 2 close to the negative pressure suction cabin head 1, a supporting part is arranged on one side of the outer tube 2 close to the hand of one tooth-shaped thrust ring at the hand end of two tooth-shaped thrust rings; the supporting part comprises supporting columns 10 which are uniformly distributed along the circumferential direction of the outer pipe 2 and have the same number with the second conical teeth 8 of the tooth-shaped pushing ring, the supporting columns 10 and the second conical teeth 8 are arranged in a one-to-one correspondence, and the axial notches 9 are arranged between the adjacent supporting columns 10. Furthermore, the axial distance between the support column 10 and the second conical tooth 8 closest to the support column 10, as viewed in a direction parallel to the axis of the outer tube 2, can be selected to be equal to the axial distance between each two adjacent toothed stop rings. For example, two toothed push rings cooperating with the bearing part together form two receiving spaces which are suitable for receiving the spring wires 3.

Further, with respect to the first tapered teeth 5 and the second tapered teeth 8, it should be noted that the outer diameter of the first tapered teeth 5 is gradually increased in the direction toward the distal means along the proximal end; the outer diameter of the second conical tooth 8 increases in the direction of the distal means along the proximal hand end. Due to the structural design, the first conical teeth 5 and the second conical teeth 8 can generate a certain limiting effect on the elastic line 3 under the matching, and the separation of the elastic line 3 from the negative pressure suction cabin head 1 is not influenced. In a preferred embodiment, when a toothed thrust ring is correspondingly coplanar with the radial surface of a toothed stop ring, the toothed thrust ring comprises four second conical teeth 8 adapted to be co-circumferential with the circumferential side walls of the four first conical teeth 5 of the toothed stop ring. This is so constructed that the first conical tooth 5 and the second conical tooth 8 together form a support and a stop for the spring wire 3.

The following description is made according to a specific process of pushing the elastic thread 3:

referring to fig. 3, in the initial state, that is, in the case of not pushing the elastic thread 3, since the tooth-shaped limit group includes three tooth-shaped limit rings and the tooth-shaped pushing group includes two tooth-shaped pushing rings, in the initial state, in order along the direction from the far hand end to the near hand end, the tooth-shaped pushing ring located at the first position is coplanar with the tooth-shaped limit ring located at the first position, the tooth-shaped pushing ring located at the second position is coplanar with the tooth-shaped limit ring located at the third position, and the tooth-shaped limit ring located at the first position exists independently and does not contact with the tooth-shaped pushing ring. Specifically, for coplanar tooth-shaped limiting rings and tooth-shaped pushing rings, after being inserted and matched, four second conical teeth 8 included in one tooth-shaped pushing ring and four first conical teeth 5 included in one tooth-shaped limiting ring are suitable for forming a radial section of 360 degrees together, that is to say, when the elastic thread 3 is sleeved in a sleeved interval formed between every two adjacent tooth-shaped limiting rings, the second conical teeth 8 cannot generate a pushing force on the elastic thread 3, and the elastic thread 3 at the moment also keeps an annular natural state.

Referring to fig. 4, F shows the moving direction of the toothed pushing ring during the process of pushing and releasing the elastic thread, and during the process of pushing the elastic thread 3, or along the direction from the far hand end to the near hand end, the toothed pushing ring located at the first position and the toothed pushing ring located at the second position both move along the negative pressure suction chamber head 1 towards the far hand end, during the moving process, the second conical tooth 8 moves along the axial groove 6 on the negative pressure suction chamber head 1, during the moving process of the second conical tooth 8, as for the elastic thread 3 confined between the adjacent toothed confinement ring and the toothed pushing ring, as viewed in the direction parallel to the axial direction of the outer tube 2, the elastic thread 3 is pushed by the second conical tooth 8 of the toothed pushing ring, during the process, the portion of the elastic thread 3 contacting the second conical tooth 8 is twisted. And in the process that the elastic line 3 which is originally limited between the first-position toothed limiting ring and the first-position toothed limiting ring is pushed out and released, the elastic line 3 which is originally limited between the tooth-shaped limiting ring at the second position and the tooth-shaped limiting ring at the second position can be pushed to a sleeving area formed between the tooth-shaped limiting ring at the first position and the tooth-shaped limiting ring at the first position, and the elastic line 3 which is originally limited between the tooth-shaped limiting ring at the second position and the bottom supporting ring is pushed to the position between the tooth-shaped limiting ring at the second position and the tooth-shaped limiting ring at the third position, so that the pushing release of the elastic line 3 which is originally positioned at the first position is realized, and the second and third elastic threads 3 arranged behind the first elastic thread 3 move and exchange positions in the far-hand end direction in turn, so that the second elastic thread 3 releases the hand and the original second and third elastic threads 3 form new first and second elastic threads 3 in sequence.

It should be noted that, in the above process, the plurality of elastic wires 3 are pushed progressively, so that the plurality of elastic wires 3 maintain the same deformation condition, and when releasing of one elastic wire 3 is completed, the tightening and ligation operations on the elastic wire 3 need to be performed, and at this time, in order to avoid that the elastic wire 3 to be released is pushed and released by mistake because of being in torsional deformation, an optional operation mode is that the outer tube 2 is moved to the direction of the proximal end by a certain distance, so that the tooth-shaped push ring can contact the push deformation action on the elastic wire 3 to make the elastic wire 3 return to the normal state, and wait for the next triggering push.

In conclusion, for the plurality of elastic threads 3, in the pushing and releasing process, the sequential supplementing pushing manner is realized, so that the elastic threads 3 needing to be pushed and released are always positioned on the part, closest to the far hand end, of the negative pressure suction cabin head 1, the contact maximization between the elastic threads 3 and the tissues to be bound is improved when the elastic threads 3 are released, and the binding effect is improved.

Example 2:

referring to fig. 1 to 10, on the basis of the elastic wire 3 pushing assembly of embodiment 1, the present embodiment provides a ligation device, including: the elastic wire 3 pushing assembly of the embodiment 1, a plurality of wire pushing rods which are connected with a plurality of elastic wires 3 in a one-to-one correspondence manner and are suitable for tightening the elastic wires 3, and an ejection mechanism which is matched with the plurality of wire pushing rods and is suitable for ejecting the wire pushing rods.

Specifically, the wire pushing rod comprises a pushing rod part 11 and a pull rod cap 12 which are connected in a matching mode; wherein the push rod part 11 is provided with a bunching channel which is suitable for bunching the elastic wires 3; the draw rod cap 12 is connected to one end of the elastic thread 3 passing through the bunching passage to be suitable for drawing the elastic thread 3; and the ejection mechanism comprises an ejection box 13, a rod piece accommodating groove 16 arranged in the ejection box 13 and an ejection roller suitable for pushing the wire pushing rod.

In the lever receiving groove 16 of the present embodiment, an opening 15 penetrating the lever receiving groove 16 is formed at a side end of the body of the ejection cartridge 13 facing the elastic cord 3, and the diameter of the opening 15 is larger than the outer diameter of the push-wire lever, so that the push-wire lever can be released from the opening 15 to be separated from the ejection cartridge 13. And for the end of the rod receiving groove 16 far from the elastic thread, when the push-wire rod is partially received in the rod receiving groove 16, the pull rod cap 12 of the push-wire rod extends out of the end of the rod receiving groove 16 far from the elastic thread, and the pull rod cap 12 cannot pass through the end of the rod receiving groove 16 far from the elastic thread without pushing the pull rod cap 12 by external force.

Specifically, the ejection roller of the present embodiment includes a cylindrical rotating body 17, and a plurality of pushing teeth 18, which are sequentially disposed on a sidewall of the cylindrical rotating body 17 along a circumferential surface of the cylindrical rotating body 17 and correspond to a plurality of wire pushing rods one by one. The plurality of pushing teeth 18 form a staggered structure along the direction parallel to the axis of the columnar rotating body 17, so that the plurality of pushing teeth 18 can sequentially realize the pushing effect on the corresponding wire pushing rod along with the rotation of the columnar rotating body 17, and a staggered pushing track cannot be generated.

To sum up, that is to say to the ejection mechanism of this embodiment, need not dismantle to the fixed knot who fixes the push wire pole in the use like the ligation device that uses among the prior art, just can release the push wire pole, and only need the hand directly stir the ejection gyro wheel can, improved the convenient high efficiency nature of operation greatly.

The above embodiments, further detailed description of the objects, technical solutions and advantages of the present invention, it should be understood that the above embodiments are only examples of the present invention, and are not intended to limit the present invention, and any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.

In the description of the present invention, it is to be understood that the terms indicating orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplification of description, and do not indicate or imply that the equipment or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate the position or positional relationship based on the position or positional relationship shown in the drawings, or the position or positional relationship which is usually placed when the product of the present invention is used, and are only for convenience of description and simplification of the description, but do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

Furthermore, the terms "horizontal", "vertical", "overhang" and the like do not imply that the components are required to be absolutely horizontal or overhang, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the present disclosure, unless otherwise expressly stated or limited, the first feature may comprise both the first and second features directly contacting each other, and also may comprise the first and second features not being directly contacting each other but being in contact with each other by means of further features between them. Also, the first feature being above, on or above the second feature includes the first feature being directly above and obliquely above the second feature, or merely means that the first feature is at a higher level than the second feature. A first feature that underlies, and underlies a second feature includes a first feature that is directly under and obliquely under a second feature, or simply means that the first feature is at a lesser level than the second feature.

Claims

1. An elastic wire pushing assembly suitable for a ligation device, comprising:

2. The elastic wire pushing assembly according to claim 1, wherein the tooth-shaped limiting group comprises at least three tooth-shaped limiting rings with the same structure, which are sequentially and alternately distributed on the outer side wall of the negative pressure suction cabin head along the direction parallel to the axis of the negative pressure suction cabin head;

3. The spring wire pushing assembly of claim 2, wherein the toothed pushing group comprises at least two toothed pushing rings of the same structure, which are sequentially and alternately distributed on the outer side wall of the outer tube along the direction parallel to the axis of the outer tube;

4. The spring wire push assembly of claim 3 wherein the first tapered tooth has an outer diameter that increases in a direction from the proximal hand end to the distal means;

5. The spring wire pushing assembly of claim 4 wherein said toothed retention group comprises three identical toothed retention rings;

6. The spring-wire pushing assembly of claim 5 wherein said four second tapered teeth of one of said toothed thrust rings are adapted to cooperate to define a 360 degree radial cross-section when engaged with said four first tapered teeth of one of said toothed stop rings.

7. The spring-wire pushing assembly of claim 5 or 6 wherein the toothed thrust ring comprises four second tapered teeth adapted to be co-circumferential with the circumferential sidewalls of the four first tapered teeth of the toothed stop ring when the toothed thrust ring is correspondingly co-planar with the radial surface of the toothed stop ring.

8. A ligation device, comprising: the elastic wire pushing assembly as claimed in any one of claims 1 to 7, a plurality of wire pushing rods connected with the plurality of elastic wires in a one-to-one correspondence and adapted to tighten the elastic wires, and an ejecting mechanism coupled with the plurality of wire pushing rods and adapted to eject the wire pushing rods.

9. The ligation device according to claim 8, wherein the push rod comprises a push rod part and a pull rod cap which are connected in a matching manner; wherein the push rod part is provided with a bunching channel suitable for bunching elastic lines;

10. The ligation device according to claim 9, wherein the ejection roller comprises a cylindrical rotating body, and a plurality of ejection teeth are sequentially arranged on the side wall of the cylindrical rotating body along the circumferential surface of the cylindrical rotating body, and correspond to the plurality of wire pushing rods one by one.