Duckbill valve and puncture device using the duckbill valve

Abstract

The present invention discloses a duckbill valve and a puncture device using the duckbill valve, comprising: an outer valve body, and an inner valve body group nested in the outer valve body; wherein the outer valve body comprises an outer support portion and an outer duckbill portion connected in one piece, an outer inlet is formed in the support portion, and an outer outlet connected to the outer inlet is formed in the outer duckbill portion; the inner valve body group comprises a first inner valve body and a second inner valve body arranged opposite to each other and suitable for abutting and matching; the first inner valve body and the second inner valve body are suitable for abutting and enclosing to form a connected inner support portion and an inner duckbill portion, an inner inlet is formed in the inner support portion, and an inner outlet suitable for being stretched open and connected to the inner inlet is formed in the inner duckbill portion; after the inner valve body group is embedded in the outer valve body, the inner outlet is suitable for extending outward from the outer outlet away from the outer inlet. The duckbill valve of the present invention can effectively take into account the rigidity requirements in the reset state and the follow-up performance when the surgical instruments such as the puncture needle rod move.

Description

Technical Field

[0001] The present invention relates to the technical field of one-way valves, and in particular to a duckbill valve and a puncture device using the duckbill valve. Background Art

[0002] Duckbill valve is a one-way valve structure, commonly known as rubber sewage check valve, also known as: back pressure flexible check valve, duckbill check valve, rubber check valve, rubber check valve, rubber slow closing check valve, etc. Duckbill valve is widely used in pipelines, such as cement pipes or glass pipes or other types of products suitable for one-way flow cutoff of water flow, such as medical puncture devices.

[0003] The duckbill valve is made of, for example but not limited to, elastic neoprene and artificial fiber through special processing, and its shape is similar to a duckbill, so it is called a duckbill valve. Generally speaking, the duckbill outlet of the duckbill valve in the prior art is a strip-shaped duckbill outlet suitable for being opened by external forces such as liquid pressure or pointed cone parts produced by a cutting process on the overall duckbill valve. The duckbill outlet produced by such a process actually relies on the elastic reset ability of the duckbill valve material itself to achieve the closure of the duckbill outlet after the external force is removed (without interference fit). Often, a memory effect occurs after being in an open state for a long time, and the outlet does not close properly after the positive external force disappears.

[0004] When there is no internal pressure, the duckbill outlet closes due to its own elasticity; as the internal pressure gradually increases, the duckbill outlet gradually increases in size to keep the liquid discharged at a high flow rate, or the duckbill outlet is stretched open by the insertion of a pointed conical object (for example, when the duckbill valve is used in a puncture device, the pointed conical puncture needle rod and other surgical instruments need to pass through the duckbill outlet of the duckbill valve). For the duckbill outlet, it can be used as a water flow cutoff or as a gas seal when it is closed.

[0005] In the process of resetting the outlet of the duckbill valve, taking the puncture device as an example, after the puncture needle (surgical instrument) rod passes through the duckbill outlet of the duckbill valve, as the puncture needle rod and other surgical instruments move, the puncture needle rod and other surgical instruments will have a certain push-up effect on the two side walls of the duckbill outlet of the duckbill valve. At this time, the two side walls of the duckbill outlet of the stretched duckbill valve need to be sealed to ensure airtightness. The two side walls of the duckbill outlet need to have certain rigidity requirements to provide sufficient resetting force. However, certain rigidity requirements will cause the elasticity of the two side walls of the duckbill outlet to decrease (pressure increase), thereby increasing the resistance of the puncture needle rod and other surgical instruments when they move. The increase in resistance will reduce the smoothness of the movement of the puncture needle rod and other surgical instruments. Therefore, here, it is necessary to meet the resetting force required when the duckbill outlet is reset and closed, and to reduce the resistance of the two side walls of the duckbill outlet to the puncture needle rod and other surgical instruments when they move, that is, to improve the smoothness of the puncture needle rod and other surgical instruments when they move. The duckbill valve conventionally used in the prior art is difficult to achieve. Summary of the invention

[0006] The first object of the present invention is to provide a duckbill valve to solve the technical problem of maintaining a good resetting effect of the duckbill valve when resetting while taking into account the elastic follow-up performance.

[0007] The second object of the present invention is to provide a trocar to solve the technical problem of maintaining a good resetting effect of the duckbill valve when resetting while taking into account the elastic follow-up property.

[0008] The duckbill valve of the present invention is realized as follows:

[0009] A duckbill valve comprises: an outer valve body, and an inner valve body assembly nested inside the outer valve body;

[0010] The outer valve body comprises an outer support portion and an outer duckbill portion which are connected in one piece, an outer inlet is formed in the support portion, and an outer outlet which is in communication with the outer inlet is formed in the outer duckbill portion;

[0011] The inner valve body assembly comprises a first inner valve body and a second inner valve body which are arranged opposite to each other and are suitable for abutting and matching; the first inner valve body and the second inner valve body are suitable for abutting and enclosing to form a connected inner support portion and an inner duckbill portion, an inner inlet is formed in the inner support portion, and an inner outlet which is suitable for being stretched open and communicates with the inner inlet is formed in the inner duckbill portion;

[0012] After the inner valve body assembly is embedded in the outer valve body, the inner outlet is suitable for extending outward from the outer side of the outer outlet away from the outer inlet.

[0013] In a preferred embodiment of the present invention, the first inner valve body comprises a first inner support portion and a first inner duckbill portion which are connected in one piece; a first folding wing portion is formed by bending at the end of the first inner duckbill portion which is away from the first inner support portion;

[0014] The second inner valve body comprises a second inner support portion and a second inner duckbill portion which are connected in one piece; a second folding wing portion is formed by bending at the end of the second inner duckbill portion which is away from the second inner support portion;

[0015] When the first inner valve body and the second inner valve body abut against each other, the second folding wing portion abuts against the first folding wing portion to form the inner outlet suitable for being stretched open;

[0016] The first folding wing portion and the second folding wing portion are adapted to partially extend outwardly of the outer outlet away from the outer inlet after abutting against each other.

[0017] In a preferred embodiment of the present invention, the first inner support portion and the second inner support portion are symmetrically arranged, and the first inner duckbill portion and the second inner duckbill portion are symmetrically arranged; and

[0018] The first folding wing portion and the second folding wing portion are symmetrically arranged.

[0019] In a preferred embodiment of the present invention, the first inner support portion and the second inner support portion are symmetrically arranged, and the first inner duckbill portion and the second inner duckbill portion are symmetrically arranged; and

[0020] The side end surface of the first folding wing portion that is suitable for abutting against the second folding wing portion is set as a slightly convex convex arc surface, and correspondingly, the side end surface of the second folding wing portion that is suitable for abutting against the first folding wing portion is set as a slightly concave concave arc surface;

[0021] When the first folding wing portion abuts against the second folding wing portion, the convex arc surface abuts against the concave arc surface and the convex arc surface is compressed and deformed under the pressing action of the concave arc surface.

[0022] 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 outward-turned portion connected to the first connecting portion and folded in a direction away from the symmetry line of the first inner duckbill portion and the second inner duckbill portion, and a first protruding portion connected to the first outward-turned portion and bent toward the plane where the inner outlet is located;

[0023] The second inner supporting portion includes a second connecting portion connected to the second inner duckbill portion, a second outward-turned portion connected to the second connecting portion and folded in a direction away from the second inner duckbill portion and a symmetry line of the second inner duckbill portion, and a second protruding portion connected to the second outward-turned portion and bent toward the plane where the inner outlet is located; and

[0024] The outer supporting portion includes an outer connecting portion connected to the outer duckbill portion, a folding portion connected to the outer connecting portion and folded toward a direction away from a symmetry line of the first inner duckbill portion and the second inner duckbill portion, and a clamping portion connected to the folding portion and bent toward a plane where the inner outlet is located, the clamping interface of the clamping portion faces the first protruding portion and the second protruding portion, and the first protruding portion and the second protruding portion are suitable for being clamped and assembled in the clamping portion;

[0025] After the inner valve body assembly is embedded in the outer valve body, the outer duckbill portion is suitable for abutting against the first inner duckbill portion and the second inner duckbill portion at the same time, the outer connecting portion is suitable for abutting against the first inner connecting portion and the second inner connecting portion at the same time, and the folding portion is suitable for abutting against the first outward-turned portion and the second outward-turned portion at the same time.

[0026] In a preferred embodiment of the present invention, the side end surface of the first folding wing facing away from the inner outlet and the side end surface of the first inner duckbill portion facing the outer duckbill portion form a first obtuse angle structure;

[0027] A second obtuse angle structure is formed between the side end surface of the second folding wing facing away from the inner outlet and the side end surface of the second inner duckbill portion facing the outer duckbill portion.

[0028] In a preferred embodiment of the present invention, the first obtuse-angle structure and the second obtuse-angle structure are of the same size.

[0029] In a preferred embodiment of the present invention, the material of the first inner duckbill portion and the first folding wing portion is the same as the material of the second inner duckbill portion and the second folding wing portion; and

[0030] The first inner duckbill portion and the first flap portion are made of a material having a stiffness greater than a stiffness of a material made of the outer duckbill portion.

[0031] In a preferred embodiment of the present invention, the end surfaces where the first folding wing portion and the second folding wing portion abut against each other are both smooth surface structures.

[0032] The trocar of the present invention is achieved as follows:

[0033] A trocar comprises: the duckbill valve.

[0034] By adopting the above technical scheme, the present invention has the following beneficial effects: compared with the traditional duckbill valve with a single integral structure, the duckbill valve of the present invention and the puncture device using the duckbill valve are composed of an outer valve body and an inner valve body group that are nested and connected, and the inner valve body group includes a first inner valve body and a second inner valve body that are suitable for abutment and cooperation, that is, there is no fixed connection relationship between the first inner valve body and the second inner valve body, but a contact relationship between the two is achieved by being nested in the outer valve body. Such a contact relationship makes it possible that even if the first inner valve body and the second inner valve body are made of a material with good rigidity, when surgical instruments such as the puncture needle rod of the puncture device are withdrawn from the duckbill valve, the good rigidity between the two makes the inner exit formed by the first inner valve body and the second inner valve body The opening closes quickly and has good air tightness after closing. At the same time, the good rigidity of the two will not form a large resistance to the movement of surgical instruments such as the puncture needle rod, because there is no absolute fixed connection between the two. The two are limited by the elasticity of the outer valve body itself. On the basis of maintaining the good elasticity of the outer valve body, the first inner valve body and the second inner valve body can also produce good follow-up performance with the outer valve body relative to surgical instruments such as the puncture needle rod, thereby making the movement of surgical instruments such as the puncture needle rod smooth, and the follow-up performance of the outer valve body with the puncture needle rod disappears after the puncture needle rod and other surgical instruments are withdrawn. At this time, the first inner valve body and the second inner valve body rely on their respective rigidity to achieve recovery to the initial tight abutment state, thereby maintaining good air tightness of the inner outlet. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a schematic structural diagram of the duckbill valve of the present invention from a first perspective;

[0036] Figure 2 It is a schematic structural diagram of the duckbill valve of the present invention from a second viewing angle;

[0037] Figure 3 It is a schematic structural diagram of the outer valve body and the inner valve body assembly of the duckbill valve of the present invention after explosion and decomposition;

[0038] Figure 4 It is a schematic diagram of the overall structure of the inner valve body assembly of the duckbill valve of the present invention;

[0039] Figure 5 It is a schematic structural diagram of the first inner valve body and the second inner valve body of the inner valve body group of the duckbill valve of the present invention after explosion and decomposition;

[0040] Figure 6 It is a schematic diagram of the overall structure of the outer valve body of the duckbill valve of the present invention;

[0041] Figure 7 It is a third perspective structural schematic diagram of the duckbill valve of the present invention;

[0042] Figure 8for Figure 7 A-section view.

[0043] In the figure: external inlet 1, external outlet 2, internal inlet 3, first internal support portion 101, first connecting portion 1011, first outward-turned portion 1012, first raised portion 1013, first internal duckbill portion 102, first folded wing portion 103, second internal support portion 201, second connecting portion 2011, second outward-turned portion 2012, second raised portion 2013, second internal duckbill portion 202, second folded wing portion 203, external support portion 301, external duckbill portion 302, inclined surface 3021, external connecting portion 3011, folded portion 3012, and clamping portion 3013. DETAILED DESCRIPTION

[0044] In order to make the contents of the present invention more clearly understood, the present invention is further described in detail below based on specific embodiments in conjunction with the accompanying drawings.

[0045] Embodiment 1:

[0046] See also Figures 1 to 8 As shown, this embodiment provides a duckbill valve, comprising: an outer valve body, and an inner valve body group nested in the outer valve body; wherein the outer valve body comprises an outer support portion 301 and an outer duckbill portion 302 connected in one piece, an outer inlet 1 is formed in the support portion, and an outer outlet 2 communicating with the outer inlet 1 is formed in the outer duckbill portion 302. The inner valve body group comprises a first inner valve body and a second inner valve body arranged opposite to each other and suitable for abutting and matching; the first inner valve body and the second inner valve body are suitable for abutting and enclosing to form a connected inner support portion and an inner duckbill portion, an inner inlet 3 is formed in the inner support portion, and an inner outlet suitable for being stretched open and communicating with the inner inlet 3 is formed in the inner duckbill portion (not marked in the figure, the figure shows the structure of the duckbill valve when it is not subjected to external force); after the inner valve body group is embedded in the outer valve body, the inner outlet is suitable for extending outward of the outer outlet 2 away from the outer inlet 1.

[0047] That is to say, the duckbill valve of this embodiment is not a single integral structure fish-mouth valve conventionally used in the traditional technology, but actually 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 fixedly connected, but are both nested in the outer valve body to achieve a butt-fit relationship between the two. It should be noted that the outer valve body and the first inner valve body and the second inner valve body of this embodiment are made of a material with a certain elasticity and deformability, such as but not limited to silicone.

[0048] In detail, the first inner valve body includes a first inner support portion 101 and a first inner duckbill portion 102 that are integrally connected; a first folded wing portion 103 is formed by bending at the end of the first inner duckbill portion 102 away from the first inner support portion 101; the second inner valve body includes a second inner support portion 201 and a second inner duckbill portion 202 that are integrally connected; a second folded wing portion 203 is formed by bending at the end of the second inner duckbill portion 202 away from the second inner support portion 201; when the first inner valve body and the second inner valve body are abutted, the second folded wing portion 203 abuts against the first folded wing portion 103 to form an inner outlet suitable for being stretched open; the first folded wing portion 103 and the second folded wing portion 203 are suitable for partially extending out of the outer outlet 2 away from the outer inlet 1 after abutting against each other.

[0049] In an optional embodiment, the first inner support portion 101 and the second inner support portion 201 are symmetrically arranged, the first inner duckbill portion 102 and the second inner duckbill portion 202 are symmetrically arranged; and the first folding wing portion 103 and the second folding wing portion 203 are symmetrically arranged. It should be noted here that when the first folding wing portion 103 and the second folding wing portion 203 are in symmetrical structures, under normal conditions, that is, when the duckbill valve is not subjected to external force, the first folding wing portion 103 and the second folding wing portion 203 are tightly abutted.

[0050] In another optional embodiment, the first inner support portion 101 is symmetrically arranged with the second inner support portion 201, and the first inner duckbill portion 102 is symmetrically arranged with the second inner duckbill portion 202; and the side end surface of the first folding wing portion 103 suitable for abutting with the second folding wing portion 203 is set as a slightly convex convex arc surface, and correspondingly, the side end surface of the second folding wing portion 203 suitable for abutting with the first folding wing portion 103 is set as a slightly concave concave arc surface; when the first folding wing portion 103 abuts with the second folding wing portion 203, the convex arc surface abuts with the concave arc surface and the convex arc surface is compressed and deformed under the pressure of the concave arc surface. That is to say, the first folding wing portion 103 and the second folding wing portion 203 are asymmetrical structures, but are designed with a concave arc surface and a convex arc surface that are matched and abutted. Of course, this is not limited to the arc surface structure, and it can also be other structures suitable for matching. In this optional implementation, in order to achieve the tightness of the abutment between the first folding wing portion 103 and the second folding wing portion 203, the concave arc surface and the convex arc surface are not exactly matched structures, but when the first folding wing portion 103 and the second folding wing portion 203 abut, the convex arc surface abuts against the concave arc surface and the convex arc surface is compressed and deformed under the pressure of the concave arc surface. In other words, the elasticity of the material itself that makes up the first inner valve body and the second inner valve body is utilized to further enhance the air tightness in the contact state compared with the abutment between the single flat end surfaces of the first folding wing portion 103 and the second folding wing portion 203.

[0051] Specifically, the first inner support portion 101 includes a first connecting portion 1011 connected to the first inner duckbill portion 102, a first outward-turned portion 1012 connected to the first connecting portion 1011 and folded in the direction of the symmetry line away from the first inner duckbill portion 102 and the second inner duckbill portion 202, and a first protruding portion 1013 connected to the first outward-turned portion 1012 and bent toward the plane where the inner outlet is located; the second inner support portion 201 includes a second connecting portion 2011 connected to the second inner duckbill portion 202, a second outward-turned portion 2012 connected to the second connecting portion 2011 and folded in the direction of the symmetry line away from the second inner duckbill portion 202 and the second inner duckbill portion 202, and a second protruding portion 2013 connected to the second outward-turned portion 2012 and bent toward the plane where the inner outlet is located. The outer support portion 301 includes an outer connecting portion 3011 connected to the outer duckbill portion 302, a folding portion 3012 connected to the outer connecting portion 3011 and folded toward the direction of the symmetry line away from the first inner duckbill portion 102 and the second inner duckbill portion 202, and a clamping portion 3013 connected to the folding portion 3012 and bent toward the plane where the inner outlet is located, the clamping interface of the clamping portion 3013 faces the first protruding portion 1013 and the second protruding portion 2013, and the first A protrusion 1013 and a second protrusion 2013 are suitable for being snap-fitted and assembled in the snap-fitting portion 3013; after the inner valve body assembly is embedded in the outer valve body, the outer duckbill portion 302 is suitable for simultaneously abutting against the first inner duckbill portion 102 and the second inner duckbill portion 202, the outer connecting portion 3011 is suitable for simultaneously abutting against the first inner connecting portion and the second inner connecting portion, and the folding portion 3012 is suitable for simultaneously abutting against the first outer eversion portion 1012 and the second outer eversion portion 2012. In other words, the first inner valve body and the second inner valve body as a whole are restricted by the interior of the outer valve body to produce corresponding deformation corresponding to the external force, for example, during the movement of surgical instruments such as the puncture needle rod, the first inner valve body and the second inner valve body also deform with the puncture needle rod and other surgical instruments.

[0052] With reference to the drawings of this embodiment, in a preferred implementation manner, the end of the outer duckbill portion 302 away from the outer connecting portion 3011 has an inclined surface 3021 which is suitable for abutting against the side end surfaces of the first folding wing portion 103 and the second folding wing portion 203 which are away from the inner outlet. The structure of such an inclined surface 3021 forms a restraining force for the first folding wing portion 103 and the second folding wing portion 203 from the outside to the inner outlet, thereby accelerating the resetting action of the first folding wing portion 103 and the second folding wing portion 203 when the external force is withdrawn.

[0053] In addition, the side end surface of the first folded wing away from the inner outlet and the side end surface of the first inner duckbill portion 102 toward the outer duckbill portion 302 form a first obtuse angle structure; the side end surface of the second folded wing away from the inner outlet and the side end surface of the second inner duckbill portion 202 toward the outer duckbill portion 302 form a second obtuse angle structure. In an optional case, the first obtuse angle structure and the second obtuse angle structure are the same in size.

[0054] It should be noted that, since the three parts of the fish-mouth valve of this embodiment, namely the outer valve body, the first inner valve body and the second inner valve body, are independent structures after disassembly, they can be molded and processed separately when producing the three parts. Therefore, in the separate processing process, the end faces of the first folding wing part 103 and the second folding wing part 203 that abut against each other can be processed into a smooth surface structure, so that the end faces of the inner outlet formed by the abutment of the first folding wing part 103 and the second folding wing part 203 and the puncture needle rod structure are smooth contact surfaces, which can reduce the friction resistance between the inner outlet and the puncture needle rod. Compared with the existing technology in which the cutting opening formed by cutting the opening on the single-structure duckbill valve cannot effectively ensure smoothness and the resistance is uncontrollable, this embodiment can significantly reduce the resistance problem existing here.

[0055] It should also be noted that the material of the first inner duckbill 102 and the first folded wing 103 is the same as the material of the second inner duckbill 202 and the second folded wing 203; and the rigidity of the material of the first inner duckbill 102 and the first folded wing 103 is greater than the rigidity of the material of the outer duckbill 302. Such material matching allows the outer valve body to have better follow-up performance with the movement of surgical instruments such as the puncture needle rod, and the increase in follow-up performance improves the smoothness of the movement of surgical instruments such as the puncture needle rod. There is no fixed connection between the first inner valve body and the second inner valve body, but a contact relationship between the two is achieved by being nested in the outer valve body. Such a contact relationship makes it possible for the first inner valve body and the second inner valve body to be made of a material with good rigidity. When surgical instruments such as the puncture needle rod of the puncture device are withdrawn from the duckbill valve, the good rigidity between the two makes the inner outlet formed by the first inner valve body and the second inner valve body close quickly and the air tightness after closing is good. At the same time, the good rigidity of the two will not form a large resistance to the movement of surgical instruments such as the puncture needle rod, because the two There is no absolutely fixed connection between them. The two are limited by the elasticity of the outer valve body itself. On the basis of maintaining good elasticity of the outer valve body, the first inner valve body and the second inner valve body can also produce good follow-up performance as the outer valve body is formed relative to surgical instruments such as the puncture needle rod, thereby making the puncture needle rod and other surgical instruments move smoothly. The follow-up performance of the outer valve body as the puncture needle rod and other surgical instruments disappears after the puncture needle rod and other surgical instruments are withdrawn. At this time, the first inner valve body and the second inner valve body rely on their respective rigidity to achieve recovery to the initial tight abutment state, thereby maintaining good air tightness of the inner outlet.

[0056] Here, in an optional implementation mode, for the first inner valve body and the second inner valve body of this embodiment, the side ends of the first inner duckbill portion 102 and the second inner duckbill portion 202 away from the outer duckbill portion 302 can also be designed with a plurality of reinforcing ribs extending from the outer support portion 301 to the outer duckbill portion 302, and the stiffness of the first inner valve body and the second inner valve body is increased by the reinforcing ribs, thereby accelerating the efficiency of the two when they are reset. Similarly, since there is no fixed connection between the second inner valve body and the second inner valve body, the design of the reinforcing ribs will not affect the follow-up performance of the first inner valve body and the second inner valve body relative to the needle rod of the puncture device.

[0057] Embodiment 2:

[0058] Based on the duckbill valve of Example 1, this embodiment provides a puncture device, including: the duckbill valve of Example 1.

[0059] The above specific embodiments further illustrate the purpose, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above are only specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

[0060] In the description of the present invention, it is necessary to understand that the terms indicating orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0061] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0062] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the product of the invention is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0063] In addition, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components are required to be absolutely horizontal or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0064] In the present invention, unless otherwise clearly specified and limited, a first feature being above or below a second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through another feature between them. Moreover, a first feature being above, above, and above a second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being below, below, and below a second feature includes the first feature being directly below and obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

Claims

1. A duckbill valve, characterized in that: It comprises: an outer valve body, and an inner valve body assembly nested inside the outer valve body; in The outer valve body comprises an outer support portion and an outer duckbill portion which are connected in one piece, an outer inlet is formed in the support portion, and an outer outlet which is in communication with the outer inlet is formed in the outer duckbill portion; The inner valve body assembly comprises a first inner valve body and a second inner valve body which are arranged opposite to each other and are suitable for abutting and matching; the first inner valve body and the second inner valve body are suitable for abutting and enclosing to form a connected inner support portion and an inner duckbill portion, an inner inlet is formed in the inner support portion, and an inner outlet which is suitable for being stretched open and communicates with the inner inlet is formed in the inner duckbill portion; After the inner valve body assembly is embedded in the outer valve body, the inner outlet is adapted to extend outwardly from the outer outlet away from the outer inlet; The first inner valve body comprises a first inner support portion and a first inner duckbill portion which are connected in one piece; a first folding wing portion is formed by bending at the end of the first inner duckbill portion which is away from the first inner support portion; The second inner valve body comprises a second inner support portion and a second inner duckbill portion which are connected in one piece; a second folding wing portion is formed by bending at the end of the second inner duckbill portion which is away from the second inner support portion; When the first inner valve body and the second inner valve body abut against each other, the second folding wing portion abuts against the first folding wing portion to form the inner outlet suitable for being stretched open; The first folding wing portion and the second folding wing portion are adapted to partially extend outward of the outer outlet away from the outer inlet after abutting against each other; The first inner support portion is symmetrically arranged with the second inner support portion, and the first inner duckbill portion is symmetrically arranged with the second inner duckbill portion; the first folding wing portion is symmetrically arranged with the second folding wing portion; The first inner supporting portion includes a first connecting portion connected to the first inner duckbill portion, a first outward-turned portion connected to the first connecting portion and folded in a direction away from the symmetry line of the first inner duckbill portion and the second inner duckbill portion, and a first protruding portion connected to the first outward-turned portion and bent toward the plane where the inner outlet is located; The second inner supporting portion includes a second connecting portion connected to the second inner duckbill portion, a second outward-turned portion connected to the second connecting portion and folded in a direction away from the second inner duckbill portion and a symmetry line of the second inner duckbill portion, and a second protruding portion connected to the second outward-turned portion and bent toward the plane where the inner outlet is located; and The outer supporting portion includes an outer connecting portion connected to the outer duckbill portion, a folding portion connected to the outer connecting portion and folded toward a direction away from a symmetry line of the first inner duckbill portion and the second inner duckbill portion, and a clamping portion connected to the folding portion and bent toward a plane where the inner outlet is located, the clamping interface of the clamping portion faces the first protruding portion and the second protruding portion, and the first protruding portion and the second protruding portion are suitable for being clamped and assembled in the clamping portion; After the inner valve body assembly is embedded in the outer valve body, the outer duckbill portion is adapted to abut against the first inner duckbill portion and the second inner duckbill portion at the same time, the outer connecting portion is adapted to abut against the first inner connecting portion and the second inner connecting portion at the same time, and the folding portion is adapted to abut against the first everted portion and the second everted portion at the same time; The side end surface of the first folded wing portion facing away from the inner outlet and the side end surface of the first inner duckbill portion facing the outer duckbill portion form a first obtuse angle structure; The side end surface of the second folded wing portion facing away from the inner outlet and the side end surface of the second inner duckbill portion facing the outer duckbill portion form a second obtuse angle structure; The first inner duckbill portion and the first flap portion are made of the same material as the second inner duckbill portion and the second flap portion; and The first inner duckbill portion and the first flap portion are made of a material having a stiffness greater than a stiffness of a material made of the outer duckbill portion.

2. The duckbill valve according to claim 1, characterized in that: The first inner supporting portion is symmetrically arranged with the second inner supporting portion, and the first inner duckbill portion is symmetrically arranged with the second inner duckbill portion; and The side end surface of the first folding wing portion that is suitable for abutting against the second folding wing portion is set as a slightly convex convex arc surface, and correspondingly, the side end surface of the second folding wing portion that is suitable for abutting against the first folding wing portion is set as a slightly concave concave arc surface; When the first folding wing portion abuts against the second folding wing portion, the convex arc surface abuts against the concave arc surface and the convex arc surface is compressed and deformed under the pressing action of the concave arc surface.

3. The duckbill valve according to claim 1, characterized in that: The first obtuse-angle structure and the second obtuse-angle structure have the same size.

4. The duckbill valve according to claim 1, characterized in that: The end surfaces where the first folding wing portion and the second folding wing portion abut against each other are both smooth surface structures.

5. A trocar, characterized in that: include: A duckbill valve as claimed in any one of claims 1 to 4.

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