CN210600315U

CN210600315U - Duckbill valve and puncture outfit using same

Info

Publication number: CN210600315U
Application number: CN201921450694.3U
Authority: CN
Inventors: 羌立忠
Original assignee: Changzhou Jiucheng Electronic Equipment Co ltd
Current assignee: Changzhou Jiucheng Electronic Equipment Co ltd
Priority date: 2019-08-29
Filing date: 2019-08-29
Publication date: 2020-05-22
Anticipated expiration: 2029-08-29

Abstract

The utility model discloses a duckbill valve and use puncture ware of this duckbill valve, include: the outer valve body and the inner valve body group are nested in the outer valve body; the outer valve body comprises an outer supporting part and an outer duck bill which are integrally connected, an outer inlet is formed on the supporting part, and an outer outlet communicated with the outer inlet is formed on the outer duck bill; the inner valve body group comprises a first inner valve body and a second inner valve body which are arranged in opposite directions and are suitable for butt joint; the first inner valve body and the second inner valve body are suitable for being abutted and enclosed to form an inner supporting part and an inner duck mouth part which are connected, an inner inlet is formed in the inner supporting part, and an inner outlet which is suitable for being spread and is communicated with the inner inlet is formed in the inner duck mouth part; after the inner valve body group is embedded in the outer valve body, the inner outlet is suitable for extending out of the outer outlet and deviates from the outer inlet. The utility model discloses a duckbilled valve can effectively compromise rigidity demand under the reset state and along with the follow-up performance when surgical instruments such as puncture needle bar move about.

Description

Duckbill valve and puncture outfit using same

Technical Field

The utility model relates to a check valve technical field especially relates to a duckbill valve and use puncture ware of this duckbill valve.

Background

The duckbill valve is a one-way valve structure commonly called as a rubber blowdown check valve, also called as a back pressure type flexible check valve, a duckbill valve check valve, a rubber slow-closing check valve and the like. Duckbill valves are widely used in conduits, such as cement or glass tubing or other types of products adapted to block one-way flow of water, such as medical piercers.

Duckbill valves are specially manufactured from materials such as, but not limited to, elastic neoprene plus rayon, and are shaped like a duckbill, so called duckbill valves. Generally, the duckbill outlet of the duckbill valve in the prior art is a strip-shaped duckbill outlet which is generated on the integral duckbill valve through a cutting process and is suitable for being opened by external force such as liquid pressure or a pointed conical component. The duckbill outlet produced by the process is essentially required to be closed (without interference fit) after the external force is removed by means of the elastic resetting capacity of the material of the duckbill valve. The memory effect often appears after the open state for a long time, and the outlet is not closed in place after the positive external force disappears.

Under the condition of no internal pressure, the duckbill outlet is closed under the self elastic action; along with the internal pressure gradually increases, the duckbill outlet gradually increases, and the liquid can be discharged at a high flow rate, or the duckbill outlet is opened by inserting a pointed cone-shaped article (for example, when the duckbill valve is used in a puncture outfit, a pointed cone-shaped puncture needle rod and other surgical instruments need to pass through the duckbill outlet of the duckbill valve), and the duckbill outlet can be used as a water flow stop under the closed condition, and can also be used as a gas seal.

In the in-process that resets in duckbill valve export, for example, with the puncture ware, after the puncture needle (surgical instruments) pole passed the duckbill export of duckbill valve, along with the activity of surgical instruments such as puncture needle bar, surgical instruments such as puncture needle bar can produce certain supporting effect to the both sides wall of the duckbill export of duckbill valve, the both sides wall of the duckbill export of the duckbill valve that is strutted this moment need realize inclosed in order to guarantee that the gas tightness needs to support the both sides wall of duckbill export and have certain rigidity requirement, provide sufficient effort that resets by certain rigidity. However, the elasticity of the two side walls of the duckbill outlet is reduced (the pressure is increased) due to certain rigidity requirements, so that the resistance of the puncture needle rod and other surgical instruments during movement is increased, and the smoothness of the movement of the puncture needle rod and other surgical instruments is reduced due to the increase of the resistance. Therefore, here both will satisfy the reset effort that duckbilled export needs when reseing closed, reduce the resistance when two lateral walls of duckbilled export move about to surgical instruments such as puncture needle bar again and also improve the smooth and easy degree when surgical instruments such as puncture needle bar, and the duckbilled valve of conventional use is difficult to realize among the prior art.

SUMMERY OF THE UTILITY MODEL

The utility model discloses a first purpose provides a duckbilled valve to the solution makes duckbilled valve compromise elasticity following nature's technical problem when keeping good effect that resets when resetting.

The second purpose of the utility model is to provide a puncture ware to the solution makes the duckbill valve compromise elasticity following nature's technical problem when keeping good effect that resets when resetting.

The utility model discloses a duckbill valve realizes like this:

a duckbill valve comprising: the outer valve body and the inner valve body group are nested inside the outer valve body; wherein

The outer valve body comprises an outer supporting part and an outer duck bill part which are integrally connected, an outer inlet is formed in the supporting part, and an outer outlet communicated with the outer inlet is formed in the outer duck bill part;

the inner valve body group comprises a first inner valve body and a second inner valve body which are arranged oppositely and are suitable for being abutted and matched; the first inner valve body and the second inner valve body are suitable for being abutted and enclosed to form an inner supporting part and an inner duck mouth part which are connected, an inner inlet is formed in the inner supporting part, and an inner outlet which is suitable for being spread and is communicated with the inner inlet is formed in the inner duck mouth part;

after the inner valve body group is embedded in the outer valve body, the inner outlet is suitable for extending out of the outer outlet and departs from the outer inlet.

In a preferred embodiment of the present invention, the first inner valve body comprises a first inner supporting portion and a first inner duckbill portion integrally connected; a first wing folding part is formed at the end part of the first inner duckbill part deviating from the first inner supporting part in a bending way;

the second inner valve body comprises a second inner supporting part and a second inner duck bill part which are integrally connected; a second flap part is formed by bending the end part of the second inner duckbill part departing from the second inner supporting part;

when the first inner valve body and the second inner valve body are abutted, the second flap part and the first flap part are abutted to form the inner outlet which is suitable for being expanded;

the first flap part and the second flap part are suitable for partially extending out of the outer outlet far away from the outer inlet after being abutted against each other.

In a preferred embodiment of the present invention, the first inner supporting portion and the second inner supporting portion are symmetrically disposed, and the first inner duckbill portion and the second inner duckbill portion are symmetrically disposed; and

the first flap part and the second flap part are symmetrically arranged.

the side end face of the first flap part, which is suitable for being abutted against the second flap part, is a slightly convex arc surface, and correspondingly, the side end face of the second flap part, which is suitable for being abutted against the first flap part, is a slightly concave arc surface;

when the first wing part is connected with the second wing part in a butting mode, the convex arc surface is connected with the concave arc surface in a butting mode, and the convex arc surface is compressed and deformed under the action of the concave arc surface in a butting mode.

In a preferred embodiment of the present invention, the first inner supporting portion includes a first connecting portion connected to the first inner duckbill portion, a first outer-turning portion connected to the first connecting portion and turned over in a direction away from a symmetry line of the first inner duckbill portion and the second inner duckbill portion, and a first protruding portion bent and connected to the first outer-turning portion toward a plane where the inner outlet is located;

the second inner supporting part comprises a second connecting part connected with the second inner duck bill part, a second outer turning part connected with the second connecting part and turned towards the direction deviating from the symmetrical line of the second inner duck bill part and the second inner duck bill part, and a second protruding part bent and connected towards the plane of the inner outlet from the second outer turning part; and

the outer supporting part comprises an outer connecting part connected with the outer duck bill part, a turnover part connected with the outer connecting part and turned over towards the direction deviating from the symmetry line direction of the first inner duck bill part and the second inner duck bill part, and a clamping part bent and connected with the turnover part towards the plane where the inner outlet is located, the clamping interface of the clamping part faces towards the first protruding part and the second protruding part, and the first protruding part and the second protruding part are suitable for being clamped and assembled in the clamping part;

after the inner valve body group is embedded in the outer valve body, the outer duckbill part is suitable for being simultaneously abutted with the first inner duckbill part and the second inner duckbill part, the outer connecting part is suitable for being simultaneously abutted with the first inner connecting part and the second inner connecting part, and the folded part is suitable for being simultaneously abutted with the first outward turning part and the second outward turning part.

In a preferred embodiment of the present invention, a side end surface of the first folding wing facing away from the inner outlet and a side end surface of the first inner duckbill facing toward the outer duckbill portion form a first obtuse angle structure;

and a second obtuse angle structure is formed between the side end surface of the second folding wing, which is deviated from the inner outlet, and the side end surface of the second inner duckbill part, which is towards the outer duckbill part.

In a preferred embodiment of the present invention, the first obtuse angle structure and the second obtuse angle structure have the same size.

In a preferred embodiment of the present invention, the first inner duck-bill portion and the first flap portion are made of the same material as the second inner duck-bill portion and the second flap portion; and

the rigidity of the material forming the first inner duck-bill portion and the first flap portion is greater than the rigidity of the material forming the outer duck-bill portion.

In a preferred embodiment of the present invention, the end surface of the first flap portion abutting against the end surface of the second flap portion is a smooth surface structure.

The utility model discloses a puncture ware is realized like this:

a puncture instrument, comprising: the duckbill valve.

By adopting the technical scheme, the utility model discloses following beneficial effect has: compared with the traditional duckbill valve with a single integral structure, the duckbill valve of the utility model consists of an outer valve body and an inner valve body which are connected in a nesting way, and the inner valve body group comprises a first inner valve body and a second inner valve body which are suitable for butt fit, namely, the first inner valve body and the second inner valve body do not have a fixed connection relation, but are in contact relation realized by being embedded in the outer valve body, the contact relation ensures that even if the first inner valve body and the second inner valve body are made of materials with better rigidity, when surgical instruments such as a puncture needle bar of the puncture device are withdrawn from the duckbill valve, the inner outlet formed by the first inner valve body and the second inner valve body is quickly closed and the air tightness after the closure is better, and simultaneously, the better rigidity of the first inner valve body and the second inner valve body does not form larger resistance to the movement process of the surgical instruments such as puncture, because there is not absolute fixed connection relation between the two, both are limited by the elasticity of outer valve body itself, on the basis of keeping the good elasticity of outer valve body, first inner valve body and second inner valve body also can produce along with the outer valve body for good followability that surgical instruments such as puncture needle bar formed, and then make the activity of surgical instruments such as puncture needle bar smooth and easy, and outer valve body disappears after surgical instruments such as puncture needle bar withdraw from along with the followability of surgical instruments such as puncture needle bar, first inner valve body and second inner valve body rely on respective independent rigidity to realize restoring to under the initial inseparable butt cooperation state at this moment, thereby keep the good gas tightness of interior export.

Drawings

Figure 1 is a first perspective structural view of the duckbill valve of the present invention;

figure 2 is a schematic diagram of a duckbill valve according to the present invention from a second perspective;

FIG. 3 is a schematic structural view of the duckbill valve of the present invention, with the outer valve body and the inner valve body exploded;

figure 4 is a schematic overall structure diagram of the internal valve body group of the duckbill valve of the present invention;

figure 5 is a schematic structural view of the duckbill valve according to the present invention, wherein the first and second inner valve bodies of the inner valve body set are exploded;

figure 6 is a schematic view of the overall structure of the outer valve body of the duckbill valve of the present invention;

figure 7 is a third perspective structural view of the duckbill valve of the present invention;

fig. 8 is a sectional view taken along line a of fig. 7.

In the figure: the external inlet 1, the external outlet 2, the internal inlet 3, the first internal support 101, the first connection 1011, the first eversion 1012, the first protrusion 1013, the first internal duckbill 102, the first flap 103, the second internal support 201, the second connection 2011, the second eversion 2012, the second protrusion 2013, the second internal duckbill 202, the second flap 203, the external support 301, the external duckbill 302, the inclined surface 3021, the external connection 3011, the eversion 3012, and the clamping portion 3013.

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 8, the present embodiment provides a duckbill valve, including: the outer valve body and the inner valve body group are nested in the outer valve body; the outer valve body comprises an outer supporting part 301 and an outer duck bill part 302 which are integrally connected, an outer inlet 1 is formed on the supporting part, and an outer outlet 2 communicated with the outer inlet 1 is formed on the outer duck bill part 302. The inner valve body group comprises a first inner valve body and a second inner valve body which are arranged in opposite directions and are suitable for butt joint; the first inner valve body and the second inner valve body are suitable for being abutted and enclosed to form an inner supporting part and an inner duck mouth part which are connected, an inner inlet 3 is formed in the inner supporting part, and an inner outlet which is suitable for being opened and is communicated with the inner inlet 3 is formed in the inner duck mouth part (the inner outlet is not marked in the figure and is shown in a structure that the duck mouth valve is not subjected to external acting force); after the inner valve body group is embedded in the outer valve body, the inner outlet is suitable for extending out of the outer outlet 2 which is far away from the outer inlet 1.

That is, for the duckbill valve of this embodiment, it is not a fish-mouth valve of a single integral structure conventionally used in the conventional art, but it essentially includes three parts, specifically, an outer valve body, a first inner valve body and a second inner valve body, wherein the first inner valve body and the second inner valve body are not in a fixed connection relationship, but are in an abutting fit relationship by being nested in the outer valve body. It should be noted that, for the military, the outer valve body, the first inner valve body and the second inner valve body of the present embodiment are made of a material with certain elasticity and deformability, such as but not limited to silicone.

In detail, the first internal valve body comprises a first internal support part 101 and a first internal duckbill part 102 which are integrally connected; a first wing part 103 is formed by bending the end part of the first inner duckbill part 102 departing from the first inner support part 101; the second inner valve body comprises a second inner support part 201 and a second inner duckbill part 202 which are integrally connected; a second flap part 203 is formed at the end part of the second inner duck mouth part 202 departing from the second inner support part 201 in a bending way; when the first inner valve body and the second inner valve body are abutted, the second flap part 203 and the first flap part 103 are abutted to form an inner outlet suitable for being expanded; the first flap part 103 and the second flap part 203 are adapted to partly protrude outside the outer outlet 2 away from the outer inlet 1, when abutted against each other.

In an alternative embodiment, the first inner support 101 and the second inner support 201 are symmetrically arranged, and the first inner duckbill 102 and the second inner duckbill 202 are symmetrically arranged; the first flap portion 103 and the second flap portion 203 are symmetrically disposed, and it should be noted that when the first flap portion 103 and the second flap portion 203 are symmetrically configured, the first flap portion 103 and the second flap portion 203 are in close contact with each other in a normal state, that is, the duckbill valve is not subjected to an external force.

In a further alternative embodiment, the first inner support part 101 and the second inner support part 201 are symmetrically arranged, and the first inner duckbill part 102 and the second inner duckbill part 202 are symmetrically arranged; the side end surface of the first flap part 103, which is suitable for being abutted with the second flap part 203, is a slightly convex arc surface, and correspondingly, the side end surface of the second flap part 203, which is suitable for being abutted with the first flap part 103, is a slightly concave arc surface; when the first tab portion 103 abuts against the second tab portion 203, the convex arc surface abuts against the concave arc surface and the convex arc surface is compressed and deformed under the abutting action of the concave arc surface. That is, the first flap portion 103 and the second flap portion 203 are asymmetric structures, and are designed with a concave arc surface and a convex arc surface for matching and abutting, although the structures are not limited to arc surfaces, and other structures suitable for matching are also possible. In this alternative embodiment, in order to achieve the tightness of the abutment between the first flap portion 103 and the second flap portion 203, the structure is not exactly adapted to the concave arc surface and the convex arc surface, but when the first flap portion 103 abuts against the second flap portion 203, the convex arc surface abuts against the concave arc surface and the convex arc surface is compressed and deformed under the abutting action of the concave arc surface, that is, the elasticity of the material itself of the first inner valve body and the second inner valve body is utilized to strengthen the air tightness in the contact state more than the abutment between the single flat end surfaces of the first flap portion 103 and the second flap portion 203.

Specifically, the first inner support 101 comprises a first connection 1011 connected to the first inner duckbill 102, a first eversion 1012 connected to the first connection 1011 and folded towards a direction away from the line of symmetry of the first inner duckbill 102 and the second inner duckbill 202, and a first protrusion 1013 connected to the first eversion 1012 and folded towards the plane of the inner outlet; the second inner supporting portion 201 comprises a second connecting portion 2011 connected with the second inner duck mouth portion 202, a second outer turning portion 2012 connected with the second connecting portion 2011 and turned over towards the direction of the symmetry line departing from the second inner duck mouth portion 202 and the second inner duck mouth portion 202, and a second protruding portion 2013 bent and connected with the second outer turning portion 2012 towards the plane where the inner outlet is located. The outer supporting part 301 comprises an outer connecting part 3011 connected with the outer duckbill part 302, a folded part 3012 connected with the outer connecting part 3011 and folded towards the direction of the symmetry line deviating from the first inner duckbill part 102 and the second inner duckbill part 202, and a clamping part 3013 connected with the folded part 3012 and folded towards the plane of the inner outlet, wherein the clamping interface of the clamping part 3013 faces the first bulge part 1013 and the second bulge part 2013, and the first bulge part 1013 and the second bulge part 2013 are suitable for being clamped and assembled in the clamping part 3013; after the inner valve body set is inserted into the outer valve body, the outer duckbill portion 302 is adapted to simultaneously abut the first inner duckbill 102 and the second inner duckbill 202, the outer connecting portion 3011 is adapted to simultaneously abut the first inner connecting portion and the second inner connecting portion, and the folded-over portion 3012 is adapted to simultaneously abut the first turned-out portion 1012 and the second turned-out portion 2012. That is to say, for the first internal valve body and the second internal valve body of whole to be restricted by the inside of outer valve body and produce corresponding deformation along with the external force is corresponding, for example first internal valve body and second internal valve body also follow-up deformation along with surgical instruments such as puncture needle bar during surgical instruments such as puncture needle bar activity.

In a preferred embodiment, referring to the drawings of the present embodiment, the end of the outer duck-bill portion 302 away from the outer connecting portion 3011 has an inclined surface 3021 adapted to abut against the side end surfaces of the first flap portion 103 and the second flap portion 203 facing away from the inner outlet, and such an inclined surface 3021 forms a restraining force for the first flap portion 103 and the second flap portion 203 from being directed from the outside to the inner outlet, and accelerates the restoring action of the first flap portion 103 and the second flap portion 203 when the external force is withdrawn.

Furthermore, the side end of the first flap facing away from the inner outlet and the side end of the first inner duckbill 102 facing toward the outer duckbill 302 form a first obtuse angle structure; the side end surface of the second flap facing away from the inner outlet and the side end surface of the second inner duckbill portion 202 facing the outer duckbill portion 302 form a second obtuse angle structure. Alternatively, the first obtuse angle structure and the second obtuse angle structure are the same size.

It should be noted that, because the three-part structure that the fish mouth valve of this embodiment includes substantially, namely the outer valve body, the first inner valve body and the second inner valve body are the independent structure after being disassembled, so the mold opening processing can be independently carried out when producing the three-part structure, therefore, the end surfaces of the first flange part 103 and the second flange part 203 which are abutted can be all processed into smooth surface structures in the independent processing process, so the inner outlet formed by the abutment of the first flange part 103 and the second flange part 203 is the smooth contact surface with the end surface of the needle bar structure of the puncture outfit, and the frictional resistance between the inner outlet and the needle bar of the puncture outfit can be reduced. Compare among the prior art on the duckbilled valve of single structure the cutting mouth that the formation opening exists can not effectively guarantee the smoothness and the resistance is uncontrollable, the resistance problem that exists here can obviously be reduced to this embodiment.

It should be noted that the first inner duck bill portion 102 and the first wing portion 103 are made of the same material as the second inner duck bill portion 202 and the second wing portion 203; and the rigidity of the material from which the first inner duckbill portion 102 and the first wing portion 103 are made is greater than the rigidity of the material from which the outer duckbill portion 302 is made. The cooperation of the materials ensures that the outer valve body generates better following performance along with the movement of the surgical instruments such as the puncture needle rod, and the smoothness of the movement of the surgical instruments such as the puncture needle rod is improved due to the increase of the following performance. For the first inner valve body and the second inner valve body, the first inner valve body and the second inner valve body are not fixedly connected but are in contact relation realized by being embedded in the outer valve body, so that even if the first inner valve body and the second inner valve body are made of materials with better rigidity, when surgical instruments such as a puncture needle rod of a puncture outfit and the like are withdrawn from the duckbill valve, the inner outlets formed by the first inner valve body and the second inner valve body are quickly closed and have better air tightness after being closed due to the better rigidity between the first inner valve body and the second inner valve body, and meanwhile, larger resistance to the movement process of the surgical instruments such as the puncture needle rod and the like cannot be formed due to the better rigidity between the first inner valve body and the second inner valve body because of the absence of absolute fixed connection relation between the first inner valve body and the second inner valve body, the first inner valve body and the second inner valve body are limited by the elasticity of the outer valve body, and on the basis of keeping the good elasticity of the, and then make surgical instruments such as the puncture needle bar move smoothly, and the outer valve body disappears after surgical instruments such as the puncture needle bar withdraw from along with the follow-up nature of surgical instruments such as the puncture needle bar, and first inner valve body and second inner valve body rely on each independent rigidity to realize restoring to under the initial state of closely abutting cooperation to keep interior export good gas tightness.

In a further alternative embodiment, for the first inner valve body and the second inner valve body of the present embodiment, a plurality of reinforcing ribs extending along the direction from the outer supporting portion 301 to the outer duck mouth portion 302 may be further designed at the side ends of the first inner duck mouth portion 102 and the second inner duck mouth portion 202 away from the outer duck mouth portion 302, so as to improve the rigidity of the first inner valve body and the second inner valve body by the reinforcing ribs, thereby accelerating the efficiency when the first inner valve body and the second inner valve body are reset. Similarly, because the second inner valve body and the second inner valve body are not fixedly connected, the following performance of the first inner valve body and the second inner valve body relative to the movement of the needle rod of the puncture outfit can not be influenced due to the design of the reinforcing ribs.

Example 2:

on the basis of the duckbill valve of embodiment 1, the present embodiment provides a puncture instrument including: the duckbill valve of example 1.

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. A duckbill valve, comprising: the outer valve body and the inner valve body group are nested inside the outer valve body; wherein

2. A duckbill valve according to claim 1 wherein said first inner valve body comprises integrally connected first inner support portion and first inner duckbill portion; a first wing folding part is formed at the end part of the first inner duckbill part deviating from the first inner supporting part in a bending way;

3. A duckbill valve according to claim 2 wherein said first and second inner support portions are symmetrically disposed, said first and second inner duckbills being symmetrically disposed; and

the first flap part and the second flap part are symmetrically arranged.

4. A duckbill valve according to claim 2 wherein said first and second inner support portions are symmetrically disposed, said first and second inner duckbills being symmetrically disposed; and

5. A duckbill valve according to any of claims 3 or 4 wherein said first inner support portion comprises a first connection to said first inner duckbill portion, a first eversion portion connected to said first connection and turned away from a line of symmetry of said first inner duckbill portion and said second inner duckbill portion, and a first protrusion connected to said first eversion portion and turned towards a plane of said inner outlet;

6. A duckbill valve according to claim 5 wherein the side end surface of said first flap facing away from said inner outlet is formed with a first obtuse angled configuration with the side end surface of said first inner duckbill facing toward said outer duckbill portion;

7. A duckbill valve according to claim 6 wherein said first obtuse angled structure is the same size as said second obtuse angled structure.

8. A duckbill valve according to claim 5 wherein said first inner duckbill and first flap portion are formed of the same material as said second inner duckbill and second flap portion; and

9. A duckbill valve according to claim 5 wherein the end surfaces of said first and second flap portions abutting each other are of smooth-faced construction.

10. A puncture instrument, comprising: a duckbill valve according to any of claims 1 to 9.