CN114699214B

CN114699214B - Flexible esophagus support with nested structure

Info

Publication number: CN114699214B
Application number: CN202210300353.8A
Authority: CN
Inventors: 马志刚; 安盼
Original assignee: Shijiazhuang University
Current assignee: Shijiazhuang University
Priority date: 2022-03-24
Filing date: 2022-03-24
Publication date: 2022-11-18
Anticipated expiration: 2042-03-24
Also published as: CN114699214A

Abstract

The invention discloses a flexible esophageal stent with a nested structure, which comprises nested rings, wherein each nested ring comprises a sleeve rod and a connecting rod, pear-shaped balls are respectively arranged at two ends of each connecting rod, two ends of each connecting rod are respectively connected with one end with a small diameter of each pear-shaped ball, the pear-shaped balls at two ends of each connecting rod are respectively nested in two ends of each sleeve rod, pear-shaped ball cavities matched with the pear-shaped balls are respectively arranged in two ends of each sleeve rod, the pear-shaped ball cavities are symmetrically distributed, a scarf channel is arranged in each sleeve rod, the scarf channel penetrates through each sleeve rod along the length direction of each sleeve rod, the number of the pear-shaped ball cavities is at least two, the pear-shaped ball cavities are uniformly distributed along the scarf channels, and the pear-shaped ball cavities are communicated with one another. According to the esophageal stent, different numbers of nested rings are placed, the diameter size of each nested ring can be independently adjusted according to different esophageal strictures of patients, different positions of an esophagus are supported differently, the applicability is high, and the problem that the existing esophageal stent is not ideal in supporting effect is effectively solved.

Description

Flexible esophageal stent with nested structure

Technical Field

The invention belongs to the field of esophageal stents, and particularly relates to a flexible esophageal stent with a nested structure.

Background

The esophageal stent has wide clinical application in the treatment of esophageal diseases, and is commonly used for treating esophageal stenosis caused by esophageal cancer, refractory benign esophageal stenosis, anastomotic fistula after esophageal surgery, esophageal perforation, scar contracture stenosis after esophageal injury, and the like, and solving the problems of acute esophageal variceal bleeding.

At present clinical use's oesophagus support is mostly the metal material, generally carries out cylindric indiscriminate support in the key position that needs the support to the esophagus, can't carry out the support that has the differentiation according to the narrow degree of esophagus, can cause some positions to support the dynamics not enough or the too big condition of holding power takes place, and the support effect is unsatisfactory. In addition, when the stent needs to be removed, the presence of the radial supporting force often makes it difficult to remove the stent, and if the stent is pulled hard, the tissue is easily damaged.

The patent with the application number of CN201921482842.X provides an esophageal stent, which comprises a feeding hole, a metal frame, a metal wire, an anti-falling ring, a circular ring and a support ring; the metal frame is woven by metal wires to form a knitting structure, a feed inlet is formed in the top end of the metal frame, the feed inlet is in a horn shape with a large top end and a small bottom end, and the left side and the right side of the top end of the feed inlet are fixedly connected with two groups of circular rings. However, in this application, the support ring is not adjustable, and the support effect is not ideal at the uneven part.

Patent with application number CN201520397648.7 proposes an esophageal stent, and this patent proposes including esophageal stent main part and skeleton, and the skeleton is in the stent main part, and there is the antiskid circle both sides of stent main part, and there is the line of retrieving inside and outside both sides of stent main part one end. This application can be in the inboard under the condition that the line breaks off of retrieving, utilizes the line of retrieving to catch on supplementary line of retrieving and retrieves, has the development pipe on the inboard line of retrieving, and the line position of retrieving is instructed in development under X-ray, convenient the retrieving, but does not solve the unsatisfactory problem of current esophageal stent supporting effect.

Disclosure of Invention

The invention aims to solve the technical problem of providing a flexible esophageal stent with a nested structure, so as to solve the problem that the existing esophageal stent is not ideal in supporting effect.

In order to solve the problems, the invention adopts the following technical scheme:

the utility model provides a flexible esophageal stent with nested structure, includes nested ring, nested ring includes loop bar and connecting rod, the connecting rod both ends are equipped with pear shape ball respectively, the both ends of connecting rod respectively with the minor diameter one end of pear shape ball links to each other, the pear shape ball at connecting rod both ends is rabbeted respectively in the both ends of loop bar, be equipped with respectively in the both ends of loop bar with the pear shape ball chamber of pear shape ball looks adaptation, pear shape ball chamber symmetric distribution, the loop bar both ends with the connecting rod both ends correspond and are the annular after connecting, be equipped with the scarf joint passageway in the loop bar, the scarf joint passageway is followed loop bar length direction runs through the loop bar, pear shape ball chamber quantity is two at least, pear shape ball chamber is followed the scarf joint passageway evenly distributed, communicate between the pear shape ball chamber.

Furthermore, the number of loop bars is at least one, the number of connecting rods is the same as the number of loop bars, the loop bars are uniformly distributed along the axis of the nested ring, and connecting ribs are arranged between the loop bars and between the connecting rods.

Furthermore, the multifunctional adjustable wrench further comprises an adjusting sleeve, the adjusting sleeve comprises an outer barrel and an inner barrel arranged in the outer barrel, the inner barrel is connected with the outer barrel in a rotating mode, adjusting pliers are arranged on the outer barrel and the inner barrel and comprise jaws and a handheld portion, the jaws comprise upper jaws and lower jaws, the upper jaws are arranged at one end of the inner barrel or the outer barrel, one end, far away from the inner barrel or the outer barrel, of the upper jaws is connected with the lower jaws in a rotating mode, one end, close to the inner barrel, of the lower jaws is connected with an adjusting rod in a rotating mode, the adjusting rod penetrates through the inner barrel side wall or the outer barrel side wall, one end, far away from the lower jaws, of the adjusting rod protrudes out of the outer barrel or the inner barrel end face, the handheld portion is fixedly connected with the outer barrel or the inner barrel is far away from one end, of the upper jaws, and the handheld portion is used for rotating the inner barrel and/or the outer barrel.

Furthermore, the outer cylinder is far away from be provided with evenly distributed's scale on the terminal surface of last keeping silent, the inner cylinder is far away from be provided with the sight on the terminal surface of last keeping silent, the sight with scale looks adaptation.

Furthermore, the upper jaw and the lower jaw are rotatably connected through a torsion spring.

Furthermore, friction lines are arranged on the opposite surfaces of the upper jaw and the lower jaw.

Furthermore, a spring is sleeved on the adjusting rod and is positioned in the side wall of the outer barrel or the side wall of the inner barrel, one end of the spring is fixedly connected with the outer barrel or the inner barrel, and the other end of the spring is fixedly connected with the adjusting rod.

The invention has the following remarkable beneficial effects:

1. the invention discloses a flexible esophageal stent with a nested structure, which comprises nested rings, wherein each nested ring comprises a loop bar and a connecting rod, the two ends of each loop bar and the two ends of each connecting rod are correspondingly connected to form a ring, and the loop bars and the connecting rods are used for supporting in a ring shape; the arrangement of the sleeve rod embedded connecting channel and the pear-shaped ball cavities symmetrically and uniformly distributed along the embedding channel can facilitate the movement of two ends of the connecting rod in the sleeve rod, the pear-shaped balls at two ends of the connecting rod move in the sleeve rod embedded connecting channel to realize the diameter change of the sleeve rod and the connecting rod, and facilitate the support of the positions of different diameters of the esophagus, and the pear-shaped balls can be clamped under the action of the pear-shaped ball cavities after moving to the pear-shaped ball cavities at different positions along the embedding channel to fix the diameter between the sleeve rod and the connecting rod; according to the invention, by placing different numbers of nested rings, the diameter size of each nested ring can be independently adjusted according to different esophageal stenosis degrees of patients, different positions of the esophagus are supported in a differentiated manner, the applicability is strong, and the problem of unsatisfactory supporting effect of the conventional esophageal stent is effectively solved.

2. Loop bar quantity is one at least, the connecting rod quantity that corresponds is the same with loop bar quantity, the axis evenly distributed of nested ring is all followed to loop bar and connecting rod, between loop bar and the loop bar, all be equipped with the splice bar between connecting rod and the connecting rod, set up through the splice bar forms a support section of thick bamboo, the setting of splice bar can make things convenient for nested ring to put into, prevent that nested ring from taking place to overturn or the displacement in the use, put into after transferring loop bar and connecting rod into the minimum diameter, loop bar and connecting rod through adjusting different positions can be adjusted the diameter of optional position on the support section of thick bamboo, the convenience supports the affected part of different positions, increase the suitability. During clinical use, the diameters of the nested rings at the two ends of the supporting cylinder are adjusted to be slightly larger than those of the nested rings in the middle, so that the support has a higher fixing effect, and the support is prevented from displacing or falling off in the esophagus.

3. In order to adjust the diameter of a nested ring formed by the loop bar and the connecting rod, the invention also comprises an adjusting sleeve, wherein the adjusting sleeve comprises an outer cylinder and an inner cylinder, adjusting pincers are arranged on the outer cylinder and the inner cylinder, the two adjusting pincers can respectively clamp the loop bar and the connecting rod, the distance between the adjusting pincers is changed by rotating the outer cylinder or the inner cylinder, the connecting rod continuously moves in an embedding channel of the loop bar along with the movement of the adjusting pincers, the adjusting pincers stop moving after the required diameter is reached, the adjusting sleeve is removed after the clamping of the adjusting pincers is cancelled, and the pear-shaped ball cavity are arranged to enable the pear-shaped ball to move outwards of the loop bar and not to move inwards of the loop bar easily, so that the supporting is convenient.

4. In order to adjust the diameter of the nested ring conveniently, one end of the outer barrel, away from the upper jaw, is provided with uniformly distributed scales, the inner barrel, away from the upper jaw, is provided with a sight on the end face, and when the outer barrel or the inner barrel is moved, the diameter change of the nested ring can be obtained by observing the sight and the scales, so that the nested ring can be adjusted conveniently by a worker.

5. The upper jaw and the lower jaw are in a stretching state all the time through the arrangement of the torsional spring for rotational connection, thereby being convenient for use.

6. Go up keep silent and keep silent the setting that relative one side all was equipped with friction line down, compare glossy clamping face, can provide better clamping-force to loop bar or connecting rod, conveniently adjust loop bar and connecting rod.

7. The spring that cup joints on the regulation pole can play the return effect to the regulation pole, conveniently to the use of adjusting the pincers and judge the initial user state of adjusting the pincers, exists as the auxiliary force again simultaneously, still can make when the torsional spring loses effect and keep opening the state with keeping under keeping the jaw.

Drawings

FIG. 1 is a schematic perspective view of a flexible esophageal stent with a nested structure according to embodiment 1 of the present invention;

FIG. 2 is a schematic top sectional view of a flexible esophageal stent nesting ring with a nesting structure according to embodiment 1 of the present invention;

FIG. 3 is a schematic structural view of a front view of a section of a telescopic rod in a flexible esophageal stent with a nested structure in accordance with embodiment 1 of the present invention;

FIG. 4 is a schematic structural diagram of a connecting rod in a flexible esophageal stent with a nested structure in a front view in the embodiment 1 of the present invention;

FIG. 5 is a schematic sectional view of a main view of an adjusting sleeve in a flexible esophageal stent with a nested structure according to embodiment 2 of the present invention;

FIG. 6 is a schematic top view of an adjusting sleeve of a flexible esophageal stent having a nested structure according to example 2 of the present invention;

FIG. 7 is a schematic sectional view of a front view of an adjusting sleeve of a flexible esophageal stent with a nested structure in accordance with example 3 of the present invention.

In the attached drawing, 1-loop bar, 2-connecting bar, 3-pear-shaped ball, 4-pear-shaped ball cavity, 5-connecting rib, 6-outer cylinder, 7-inner cylinder, 8-upper jaw, 9-lower jaw, 10-adjusting bar, 11-hand-held part, 12-scale, 13-sight and 14-spring.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the application, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

The relative arrangement of the components and steps, the numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present application unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as exemplary only and not as limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

In the description of the present application, it is to be understood that the directions or positional relationships indicated by the directional terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom", etc., are generally based on the directions or positional relationships shown in the drawings, and are for convenience of description and simplicity of description only, and in the case of not making a reverse description, these directional terms do not indicate and imply that the device or element being referred to must have a particular orientation or be constructed and operated in a particular orientation, and therefore should not be construed as limiting the scope of the present application; the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.

For ease of description, spatially relative terms such as "over 8230 \ 8230;,"' over 8230;, \8230; upper surface "," above ", etc. may be used herein to describe the spatial relationship of one device or feature to another device or feature as shown in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary terms "at 8230; \8230; 'above" may include both orientations "at 8230; \8230;' above 8230; 'at 8230;' below 8230;" above ". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

It should be noted that the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and the terms have no special meanings unless otherwise stated, and therefore, the scope of protection of the present application is not to be construed as being limited.

Example 1

As shown in fig. 1-4, a flexible esophageal stent with nested structure, including nested ring, nested ring includes loop bar 1 and connecting rod 2, connecting rod 2 both ends are equipped with pyriform ball 3 respectively, the both ends of connecting rod 2 link to each other with the minor diameter one end of pyriform ball 3 respectively, the pyriform ball 3 of connecting rod 2 both ends splices respectively in the both ends of loop bar 1, be equipped with the pyriform ball chamber 4 with the pyriform ball 3 looks adaptation in the both ends of loop bar 1 respectively, the pyriform ball chamber 4 symmetric distribution, the loop bar 1 both ends and the connecting rod 2 both ends correspond and are the annular after connecting, be equipped with the scarf joint passageway in the loop bar 1, the scarf joint passageway runs through loop bar 1 along loop bar 1 length direction, the pyriform ball chamber 4 is two at least, the pyriform ball chamber 4 is along the scarf joint passageway evenly distributed, communicate between the pyriform ball chamber 4.

Further, loop bar 1 quantity is one at least, and connecting rod 2 quantity is the same with loop bar 1 quantity, and loop bar 1 all is provided with splice bar 5 between the loop bar 1 and between the connecting rod 2 along nested ring axis evenly distributed.

Specifically, the nesting ring is annular and comprises a sleeve rod 1 and a connecting rod 2, two ends of the sleeve rod 1 and two ends of the connecting rod 2 are correspondingly connected in pairs to form an annular shape, two ends of the connecting rod 2 are fixedly connected with pear-shaped balls 3 respectively, the small-diameter end of each pear-shaped ball 3 is connected with the end face of the connecting rod 2, the pear-shaped balls 3 and the connecting rod 2 are integrally formed, pear-shaped ball cavities 4 matched with the pear-shaped balls 3 are arranged in two ends of the sleeve rod 1 respectively, the two pear-shaped ball cavities 4 are symmetrically distributed in the sleeve rod 1, the diameters of the nesting ring are adjusted conveniently, a nesting channel along the length direction of the sleeve rod 1 is arranged in the sleeve rod 1, the nesting channel penetrates through the sleeve rod 1, the pear-shaped ball cavities 4 are symmetrically and uniformly distributed at the middle point of the nesting channel along the length direction of the nesting channel, and the pear-shaped ball cavities 4 are communicated through the nesting channel; in order to carry out the whole support to the position that needs supported, the quantity of loop bar 1 is more than one, be three in this embodiment, connecting rod 2 is the same with the quantity of loop bar 1, the central axis evenly distributed of nested ring is all followed to connecting rod 2 and loop bar 1, between the loop bar 1 and between the connecting rod 2 equal fixedly connected with splice bar 5, the setting of splice bar 5 can link together the nested ring that loop bar 1 and connecting rod 2 formed and form the tube-shape, the convenience is to the whole support in affected part.

The sleeve rod 1 and the connecting rod 2 can be made of flexible biomedical materials such as organic silicon rubber, polyurethane, polycaprolactone and the like, the materials have good histocompatibility and excellent elasticity, can be properly adjusted and deformed along with the peristalsis of the esophagus, patients have no obvious foreign body sensation after the materials are placed in the esophagus tissue, and the obvious inflammatory reaction of the esophagus tissue is reduced.

When the esophageal stent is used, the pear-shaped balls 3 at two ends of the connecting rod 2 are inserted into the pear-shaped ball cavities 4 in the loop bar 1 respectively and correspondingly in advance, the two pear-shaped balls 3 are moved into the two pear-shaped ball cavities 4 which are nearest to the midpoint of the embedding passage respectively, the diameter of the embedding ring is the minimum diameter at the moment, after an affected part needing to be supported is placed, the diameter of the embedding ring can be changed by drawing the connecting rod 2 away from the loop bar 1, the connecting rod 2 which does not use a position is drawn away, the loop bar 1 can reasonably support the affected parts which need to be supported according to different positions, the nesting rings can be connected together to form a whole by the connecting ribs 5, the nesting rings can be conveniently placed and adjusted, but the single embedding ring can be independently placed and then adjusted, the using method is diversified, the affected parts needing to be supported can be reasonably supported by the single or multiple embedding rings with the diameters capable of being independently adjusted, supporting force is reasonably distributed at the affected parts, the situation that some affected parts are not ideally supported effectively is avoided, and the problem of supporting effect of the existing esophageal stent is effectively solved.

Example 2

As shown in fig. 5 and 6, the structure of the present embodiment is substantially the same as that of embodiment 1, and the present embodiment is further optimized based on embodiment 1: the invention also comprises an adjusting sleeve, the adjusting sleeve comprises an outer cylinder 6 and an inner cylinder 7 arranged in the outer cylinder 6, the inner cylinder 7 is rotatably connected with the outer cylinder 6, adjusting pliers are arranged on the outer cylinder 6 and the inner cylinder 7, each adjusting pliers comprises a jaw and a handheld part 11, each jaw comprises an upper jaw 8 and a lower jaw 9, each upper jaw 8 is arranged at one end of the inner cylinder 7 or the outer cylinder 6, one end of each upper jaw 8, far away from the inner cylinder 7 or the outer cylinder 6, is rotatably connected with the lower jaw 9, one end of each lower jaw 9, close to the inner cylinder 7, is rotatably connected with an adjusting rod 10, each adjusting rod 10 is arranged in the side wall of the inner cylinder 7 or the side wall of the outer cylinder 6 in a penetrating manner, one end, far away from the lower jaw 9, of each adjusting rod 10 protrudes out of the end face of the inner cylinder 6 or the inner cylinder 7, the handheld part 11 is fixedly connected at one end, far away from the upper jaw 8, of the outer cylinder 6 or the inner cylinder 7 and/or the outer cylinder 6 in a rotating manner.

Furthermore, the end face of the outer cylinder 6, which is far away from the upper jaw 8, is provided with evenly distributed scales 12, the end face of the inner cylinder 7, which is far away from the upper jaw 8, is provided with a sight 13, and the sight 13 is matched with the scales 12.

Further, the upper jaw 8 and the lower jaw 9 are rotatably connected through a torsion spring.

Furthermore, the opposite surfaces of the upper jaw 8 and the lower jaw 9 are provided with friction lines.

The adjustable clamp comprises a jaw part and a handheld part 11, the jaw part comprises an upper jaw 8 and a lower jaw 9, the upper jaw 8 is fixedly connected to the end face of the corresponding outer cylinder 6 or inner cylinder 7, the upper jaw 8 fixed on the outer cylinder 6 and the inner cylinder 7 extends to the outside of the circumference of the outer cylinder 6, the lower jaw 9 is rotatably connected with one end of the upper jaw 8 far away from the outer cylinder 6 or inner cylinder 7, the lower jaw 9 is mounted corresponding to the upper jaw 8, the lower jaw 9 positioned on the outer cylinder 6 and one end of the lower jaw 9 positioned on the inner cylinder 7 facing the axis of the inner cylinder 7 are rotatably connected with an adjusting rod 10, the adjusting rod 10 is correspondingly arranged in the side wall of the outer cylinder 6 and the side wall of the inner cylinder 7 in a penetrating manner, one end of the adjusting rod 10 far away from the lower jaw 9 protrudes out of the end face of the outer cylinder 6 or the inner cylinder 7, the adjusting rod 10 can move up and down in the side wall of the outer cylinder 6 or the side wall of the inner cylinder 7, and the upper jaw 8 can generate clamping force through the adjusting rod 10. The handheld part 11 is fixedly connected to one end, far away from the upper jaw 8, of the outer barrel 6 or the inner barrel 7, the handheld part 11 is used for enabling a worker to hold the outer barrel 6 and/or the inner barrel 7 to rotate, the distance between the two adjusting pliers is changed, the connecting rod 2 is further separated from the loop bar 1, the diameter of the nested ring is changed, and the handheld part 11 can be a handle, a rod body or other objects which can be held by a human body; in order to conveniently master the diameter change of the nested ring, scales 12 are uniformly distributed on the circular end face of the outer cylinder 6, which is far away from the upper jaw 8, a sight 13 is arranged on the end face of the inner cylinder 7, which is far away from the upper jaw 8, the sight 13 is arranged corresponding to the scales 12, the scales 12 are arranged on the outer cylinder 6, and the sight 13 is arranged on the inner cylinder 7, so that the moving distance of the adjusting clamp can be judged when the outer cylinder 6 and/or the inner cylinder 7 rotate, the adjustment of the loop bar 1 and the connecting rod 2 is further judged, and the accurate adjustment of the diameter is realized; the upper jaw 8 and the lower jaw 9 are rotatably connected through the torsion spring, so that the upper jaw 8 and the lower jaw 9 are always in an open state, and the initial state of the jaws can be conveniently judged and used by a worker; the opposite side of the upper jaw 8 and the lower jaw 9 is provided with friction grains, so that clamping force can be conveniently provided for the loop bar 1 and the connecting rod 2, and the upper jaw 8 and the lower jaw 9 are prevented from sliding on the loop bar 1 and the connecting rod 2 after being closed.

When the nesting ring adjusting device is used, a worker firstly adjusts three nesting rings connected through the connecting ribs 5 to be the minimum diameter, after the nesting rings are placed at positions needing to be supported, one end, provided with a jaw, of the adjusting sleeve faces the nesting rings and places the adjusting sleeve into the nesting rings, the adjusting sleeve is moved to enable the upper jaw 8 on the outer barrel 6 and the upper jaw 8 on the inner barrel 7 to be located on one side of the loop bar 1 and one side of the connecting rod 2 respectively, the worker holds the handheld portion 11 on the outer barrel 6 and the handheld portion 11 on the inner barrel 7 and simultaneously presses two adjusting rods 10 corresponding to the two handheld portions, the adjusting rods 10 drive the lower jaw 9 to move while pressing, the lower jaw 9 and the upper jaw 8 are closed to respectively generate clamping force on the loop bar 1 and the connecting rod 2, the inner barrel 7 rotates in the outer barrel 6 through movement of the handheld portion 11, the diameters of the nesting rings are adjusted through observation of the scales 12 and the sight of the sight star 13, after adjustment of one nesting ring is completed, the adjusting rods 10 are loosened, the lower jaw 9 and the upper jaw 8 are moved to the next nested ring to be opened until all the nesting rings are adjusted.

Example 3

As shown in fig. 7, the structure of the present embodiment is substantially the same as that of embodiment 2, and the present embodiment is further optimized based on embodiment 2: the adjusting rod 10 is sleeved with a spring 14, the spring 14 is positioned in the side wall of the outer cylinder 6 and/or the side wall of the inner cylinder 7, one end of the spring 14 is fixedly connected with the outer cylinder 6 or the inner cylinder 7, and the other end of the spring 14 is fixedly connected with the adjusting rod 10.

Specifically, a spring 14 is sleeved on the adjusting rod 10, the spring 14 extends along the length direction of the adjusting rod 10, the number of the springs 14 is two, the two springs 14 are respectively located in the side wall of the outer cylinder 6 and the side wall of the inner cylinder 7, one end of the spring 14 located in the outer cylinder 6 is fixedly connected with the outer cylinder 6, one end of the spring 14 located in the inner cylinder 7 is fixedly connected with the inner cylinder 7, the other ends of the two springs 14 are fixedly connected with the adjusting rod 10, the adjusting rod 10 can have a moving return capability after being pressed down through the arrangement of the spring 14, the adjusting rod 10 can automatically return after a worker loosens the adjusting rod 10, the arrangement of the spring 14 can be matched with the torsion spring, the spring 14 can also be used independently when the torsion spring loses effect, and the return capability is provided for the adjusting rod 10.

At present, the technical scheme of the application has been subjected to pilot plant test, namely small-scale experiment before large-scale mass production of products; after the pilot plant test is finished, user use investigation is developed in a small range, and the investigation result shows that the user satisfaction is high; the preparation of products for formal production for industrialization (including intellectual property risk early warning research) has been started.

Claims

1. A flexible esophageal stent having a nested configuration, comprising: the embedded ring comprises a nested ring and an adjusting sleeve, the nested ring comprises a sleeve rod (1) and connecting rods (2), pear-shaped balls (3) are arranged at two ends of each connecting rod (2) respectively, two ends of each connecting rod (2) are connected with one small-diameter end of each pear-shaped ball (3) respectively, the pear-shaped balls (3) at two ends of each connecting rod (2) are embedded in two ends of each sleeve rod (1) respectively, pear-shaped ball cavities (4) matched with the pear-shaped balls (3) are arranged in two ends of each sleeve rod (1) respectively, the pear-shaped ball cavities (4) are symmetrically distributed, two ends of each sleeve rod (1) and two ends of each connecting rod (2) are connected correspondingly and then are annular, embedding channels are arranged in the sleeve rods (1), the embedding channels penetrate through the sleeve rods (1) along the length direction of the sleeve rods (1), the number of the pear-shaped ball cavities (4) is at least two, the pear-shaped ball cavities (4) are uniformly distributed along the embedding channels, and the pear-shaped ball cavities (4) are communicated with each other; the number of the loop bars (1) is at least one, the number of the connecting rods (2) is the same as that of the loop bars (1), the loop bars (1) are uniformly distributed along the axis of the nesting ring, and connecting ribs (5) are arranged between the loop bars (1) and between the connecting rods (2); the adjusting sleeve comprises an outer barrel (6) and an inner barrel (7) arranged in the outer barrel (6), the inner barrel (7) is rotatably connected with the outer barrel (6), the outer barrel (6) and the inner barrel (7) are both provided with adjusting pliers, each adjusting pliers comprises a jaw and a handheld portion (11), each jaw comprises an upper jaw (8) and a lower jaw (9), each upper jaw (8) is arranged at one end of the inner barrel (7) or the outer barrel (6), each upper jaw (8) is far away from one end of the inner barrel (7) or the outer barrel (6) and is rotatably connected with the lower jaw (9), each lower jaw (9) is close to one end of the inner barrel (7) and is rotatably connected with an adjusting rod (10), each adjusting rod (10) is arranged in the side wall of the inner barrel (7) or in the side wall of the outer barrel (6), each adjusting rod (10) is far away from one end of the lower jaw (9) and protrudes out of the end face of the outer barrel (6) or the inner barrel (7), and the handheld portions (11) are fixedly connected with the outer barrel (6) or the one end of the inner barrel (7) is used for rotating.

2. A flexible esophageal stent having a nesting arrangement according to claim 1, wherein: keep away from urceolus (6) be provided with evenly distributed's scale (12) on the terminal surface of last jaw (8), inner tube (7) are kept away from be provided with sight (13) on the terminal surface of last jaw (8), sight (13) with scale (12) looks adaptation.

3. A flexible esophageal stent having a nested configuration as claimed in claim 2 wherein: the upper jaw (8) is rotationally connected with the lower jaw (9) through a torsion spring.

4. A flexible esophageal stent having a nesting configuration according to claim 3, wherein: and friction grains are arranged on one surface of the upper jaw (8) opposite to the lower jaw (9).

5. A flexible esophageal stent having a nested configuration as claimed in claim 4 wherein: a spring (14) is sleeved on the adjusting rod (10), the spring (14) is located in the side wall of the outer cylinder (6) or the side wall of the inner cylinder (7), one end of the spring (14) is fixedly connected with the outer cylinder (6) or the inner cylinder (7), and the other end of the spring (14) is fixedly connected with the adjusting rod (10).