WO2021078155A1

WO2021078155A1 - One-way valve and medical catheter having same

Info

Publication number: WO2021078155A1
Application number: PCT/CN2020/122502
Authority: WO
Inventors: 叶乐; 许冠哲; 高猛; 杨旭燕
Original assignee: 杭州未名信科科技有限公司; 浙江省北大信息技术高等研究院
Priority date: 2019-10-22
Filing date: 2020-10-21
Publication date: 2021-04-29
Also published as: CN110947092A

Abstract

A one-way valve and a medical catheter having same, which belong to the field of medical instruments. The one-way valve (10) comprises: a fixed portion (11), the fixed portion (11) being used for being connected to the inner wall of a catheter body (20) of a medical catheter, a flow-through hole (111) being provided on the fixed portion (11); and a deformation portion (121), the deformation portion (121) being connected to the fixed portion (11), the deformation portion (121) having a first form and a second form, the deformation portion (121) blocking the flow-through hole (111) when in the first form, and the deformation portion (121) unblocking the flow-through hole (111) when in the second form, when a liquid in the catheter body (20) flows in a first direction, the deformation portion (121) being driven to be in the first form, and when the liquid in the catheter body (20) flows in a second direction, the deformation portion (121) being driven to be in the second form. The one-way valve has a purely mechanical structure, not needing a circuit to perform control or considering the sealing problem in a liquid environment, thus allowing a relatively simple structure and a relatively low manufacturing cost.

Description

One-way valve and medical catheter with same

Technical field

The invention belongs to the field of medical equipment, and specifically relates to a one-way valve and a medical catheter with the one-way valve.

Background technique

Medical catheters are widely used in various medical devices that require liquid delivery, such as the most common infusion catheters. When medical catheters are used in implantable/interventional medical devices, the mechanical properties and biocompatibility of the medical catheters have more stringent requirements. In addition, in certain application scenarios, medical catheters are also required to have some special properties, such as unidirectional fluidity. Take the medical catheter of an implantable insulin pump as an example. If the medical catheter does not have unidirectional fluidity, the body fluid will come into contact with the drug solution in the medical catheter, thereby contaminating the drug. Insulin is also easy to crystallize, which hinders the delivery of subsequent drug solutions and affects the therapeutic effect.

In the related art, medical catheters usually use one-way valves to achieve their one-way fluidity. The existing one-way valves are mostly controlled by circuits, and sealing problems need to be considered in a liquid environment, so the structure is complicated and the cost is high.

Summary of the invention

The purpose of the present invention is to at least solve the problem of complicated structure and high cost of the one-way valve of the existing medical catheter. This purpose is achieved through the following technical solutions:

The embodiment of the first aspect of the present invention proposes a one-way valve for a medical catheter. The one-way valve includes a fixing portion for connecting the inner wall of the catheter body of the medical catheter. The part is provided with a flow hole; a deformed part, the deformed part is connected to the fixed part, the deformed part has a first form and a second form, and the deformed part blocks the Overflow hole, when the deformed portion is in the second form, the blocking of the overflow hole is released, and when the liquid in the catheter body flows in the first direction, the deformed portion is driven into the first form, so When the liquid in the catheter body flows in the second direction, the deformed portion is driven into the second form.

According to the one-way valve of the embodiment of the present invention, it includes a fixed part and a deformed part. The deformed part can switch between the first form and the second form under the action of the liquid in the catheter body of the medical catheter, and the deformed part is in the second form. In the first form, the overflow hole on the fixed part is blocked, and when the deformed part is in the second form, the blockage of the overflow hole is released, and when the liquid in the catheter body flows in the first direction, the deformed part is driven into the first form. When the liquid in the pipe body flows in the second direction, the deformed portion is driven into the second form, thereby ensuring that the liquid in the pipe body can only pass through the flow hole when flowing in the second direction, thereby realizing the liquid in the pipe body. One-way flow. In addition, the one-way valve of the embodiment of the present invention has a purely mechanical structure, which does not need to be controlled by a circuit, and does not need to consider the sealing problem in a liquid environment, so the structure is relatively simple and the manufacturing cost is relatively low.

In addition, the one-way valve according to the embodiment of the present invention may also have the following additional technical features:

In some embodiments of the present invention, the deformable portion includes a plurality of bionic valves, and mouths are formed between the plurality of bionic valves, and the ends of the plurality of bionic valves are exposed to liquid flowing in the first direction. Under the action of, can be close to each other to close the mouth, and the ends of a plurality of the bionic petals can be moved away from each other under the action of the liquid flowing in the second direction to open the mouth.

In some embodiments of the present invention, the number of the bionic valve is three.

In some embodiments of the present invention, the bionic valve is made of one of polyethylene, polypropylene, nylon, polyetheretherketone, polytetrafluoroethylene, polyoxymethylene, ABS, PBT, and polyphenylene sulfide.

In some embodiments of the present invention, the deforming part is a blade rotatably connected with the fixed part.

In some embodiments of the present invention, the number of blades is two, the one-way valve further includes a connecting shaft disposed in the flow hole, the connecting shaft passes through the center of the flow hole, and two The blades are all rotatably connected with the connecting shaft.

In some embodiments of the present invention, the flow hole is a tapered hole that is tapered along the first direction, and the outer edge of the blade is a curved surface that matches the wall surface of the tapered hole.

In some embodiments of the present invention, the one-way valve is made of titanium alloy, stainless steel, aluminum alloy, magnesium aluminum alloy, nickel alloy, polyethylene, polypropylene, nylon, polyether ether ketone, polytetrafluoroethylene , At least one of polyoxymethylene, ABS, PBT, and polyphenylene sulfide.

In some embodiments of the present invention, the fixing part is a fixing ring.

The embodiment of the second aspect of the present invention proposes a medical catheter, including a catheter body and a one-way valve provided in the catheter body, the one-way valve being the one-way valve in any of the above-mentioned embodiments.

A medical catheter according to an embodiment of the present invention includes a catheter body and a one-way valve provided in the catheter body, wherein the one-way valve includes a fixing part and a deforming part, and the deforming part can act on the liquid in the catheter body of the medical catheter Switch between the first form and the second form. When the deformed part is in the first form, the over-flow hole on the fixed part is blocked, and when the deformed part is in the second form, the over-flow hole is released, and the catheter When the liquid in the body flows in the first direction, the deformed part is driven into the first form, and when the liquid in the catheter body flows in the second direction, the deformed part is driven into the second form. This ensures that the liquid in the catheter body only moves along the second form. It can pass through the flow hole only when it flows in two directions, so as to realize the one-way flow of the liquid in the pipe body. Since the one-way valve is a purely mechanical structure, it does not need to be controlled by an electric circuit, nor does it need to consider the sealing problem in a liquid environment, so the structure is relatively simple and the manufacturing cost is relatively low.

Description of the drawings

By reading the detailed description of the preferred embodiments below, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only used for the purpose of illustrating the preferred embodiments, and are not considered as a limitation to the present invention. Throughout the drawings, the same reference numerals are used to denote the same components. In the attached picture:

Figure 1 is a schematic diagram of a medical catheter according to an embodiment of the present invention (the one-way valve is in the first form);

Figure 2 is a schematic diagram of a medical catheter according to an embodiment of the present invention (the one-way valve is in the second form);

Figure 3 is a schematic diagram of a one-way valve according to an embodiment of the present invention;

Figure 4 is a schematic diagram of a one-way valve according to another embodiment of the present invention (in the first form);

Fig. 5 is a schematic side view of the structure shown in Fig. 4;

Fig. 6 is a schematic diagram of a one-way valve according to another embodiment of the present invention (in the second form).

The symbols in the drawings are as follows:

100: Medical catheter;

10: One-way valve;

11: fixed part, 111: flow hole, 12: deformed part, 121: bionic valve, 122: mouth, 123: blade, 13: connecting shaft;

20: Catheter body.

Detailed ways

Hereinafter, exemplary embodiments of the present disclosure will be described in more detail with reference to the accompanying drawings. Although the drawings show exemplary embodiments of the present disclosure, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

It should be understood that the terms used in the text are only for the purpose of describing specific example embodiments, and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "a", "an" and "said" as used in the text may also mean that the plural forms are included. The terms "including", "including", "containing" and "having" are inclusive, and therefore indicate the existence of the stated features, steps, operations, elements and/or components, but do not exclude the existence or addition of one or Various other features, steps, operations, elements, parts, and/or combinations thereof. The method steps, processes, and operations described in the text are not interpreted as requiring them to be executed in the specific order described or illustrated, unless the order of execution is clearly indicated. It should also be understood that additional or alternative steps may be used.

Although the terms first, second, third, etc. may be used in the text to describe multiple elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be These terms are restricted. These terms may only be used to distinguish one element, component, region, layer or section from another region, layer or section. Unless clearly indicated by the context, terms such as "first", "second" and other numerical terms do not imply an order or order when used in the text. Therefore, the first element, component, region, layer or section discussed below may be referred to as a second element, component, region, layer or section without departing from the teachings of the example embodiments.

For ease of description, spatial relative terms may be used in the text to describe the relationship of one element or feature relative to another element or feature as shown in the figure. These relative terms are, for example, "inner", "outer", and "inner". ", "outside", "below", "below", "above", "above", etc. This spatial relative relationship term is intended to include different orientations of the device in use or operation other than the orientation depicted in the figure. For example, if the device in the figure is turned over, then elements described as "below other elements or features" or "below other elements or features" will then be oriented as "above the other elements or features" or "over the other elements or features". Above features". Therefore, the example term "below" can include an orientation of above and below. The device can be otherwise oriented (rotated by 90 degrees or in other directions) and the spatial relative relationship descriptors used in the text are explained accordingly.

As shown in FIGS. 1 to 6, the embodiment of the first aspect of the present invention proposes a one-way valve 10, which is used in a medical catheter 100, and the one-way valve 10 includes a fixed portion 11 and a deformed portion 12. Specifically, the fixing part 11 is used to connect the inner wall of the catheter body 20 of the medical catheter 100, and the fixing part 11 is provided with a flow hole 111, and the flow hole 111 is used to allow the liquid in the catheter body 20 to pass through the one-way valve 10. The deforming part 12 is connected to the fixing part 11. The deforming part 12 has a first form and a second form that can be converted to each other. When the deforming part 12 is in the first form, the flow hole 111 is blocked. At this time, the liquid in the catheter body 20 cannot Through the flow hole 111, when the deformed part 12 is in the second form, the blocking of the flow hole 111 is released. At this time, the liquid in the catheter body 20 can pass through the flow hole 111. When the liquid in the catheter body 20 flows in the first direction, the deformed portion 12 is driven into the first form, and when the liquid in the catheter body 20 flows in the second direction, the deformed portion 12 is driven into the second form.

It is easy to understand that the liquid in the duct body 20 may have two opposite flow directions. If one of the flow directions is defined as the first direction, then the other flow direction is defined as the second direction.

According to the one-way valve 10 of the embodiment of the present invention, it includes a fixed portion 11 and a deformed portion 12. The deformed portion 12 can be operated between the first form and the second form under the action of the liquid in the catheter body 20 of the medical catheter 100 Conversion: when the deformed part 12 is in the first form, the overflow hole 111 on the fixed part 11 is blocked, and when the deformed part 12 is in the second form, the overflow hole 111 is unblocked, and the liquid in the catheter body 20 follows the first form. When flowing in one direction, the deformed portion 12 is driven into the first form, and when the liquid in the catheter body 20 flows in the second direction, the deformed portion 12 is driven into the second form, thereby ensuring that the liquid in the catheter body 20 only moves in the second direction. It can pass through the flow hole 111 when it flows, so that the one-way flow of the liquid in the pipe body 20 is realized. In addition, the one-way valve 10 of the embodiment of the present invention has a purely mechanical structure, which does not need to be controlled by a circuit, and does not need to consider the sealing problem in a liquid environment, so the structure is relatively simple and the manufacturing cost is relatively low.

In some embodiments of the present invention, as shown in FIG. 3, the deforming portion 12 includes a plurality of bionic valves 121, and an opening 122 communicating with the flow hole 111 is formed between the plurality of bionic valves 121. The ends can be close to each other under the action of the liquid flowing in the first direction to close the mouth 122, and the ends of the multiple pieces of bionic valve 121 can be moved away from each other under the action of the liquid flowing in the second direction to make the mouth 122 Open.

In this embodiment, the deforming portion 12 includes a plurality of bionic valves 121, which mainly imitate the aortic valve in an animal body. When the liquid in the catheter body 20 flows in the second direction, the ends of the multiple bionic valves 121 are moved away from each other under the impact of the liquid, so that the mouth 122 is opened. At this time, the liquid can pass through the flow hole. 111. When the liquid in the catheter body 20 flows in the first direction, under the impact of the liquid, its ends are close to each other, that is, the bionic valve 121 is folded to close the mouth 122. At this time, the liquid cannot pass through the flow hole 111 .

Further, the number of the bionic valve 121 is at least two, that is to say, the provision of two bionic valves 121 is the minimum requirement to realize the plugging of the flow hole 111 and the contact plugging. Preferably, the number of biomimetic valves 121 is three. In this case, the overflow hole 111 can be better blocked, and the number of biomimetic valves 121 can be relatively small, thereby reducing the processing cost.

Further, the biomimetic valve 121 must have a certain deformability. Therefore, the preferred manufacturing material can be polyethylene, polypropylene, nylon, polyether ether ketone, polytetrafluoroethylene, polyoxymethylene, ABS (Acrylonitrile Butadiene Styrene, propylene One of nitrile-butadiene-styrene copolymer), PBT (Polybutylene terephthalate, polybutylene terephthalate), and polyphenylene sulfide.

In some other embodiments of the present invention, as shown in FIGS. 4-6, the deforming portion 12 is a blade 123 rotatably connected to the fixed portion 11, and the rotation of the blade 123 can block and release the flow hole 111 Blocking, thereby realizing the one-way flow of the liquid in the catheter body 20.

Further, there are two blades 123, the one-way valve 10 further includes a connecting shaft 13 arranged in the flow hole 111, the connecting shaft 13 passes through the center of the flow hole 111, and the two blades 123 are both rotatably connected with the connecting shaft 13. In this embodiment, the connecting shaft 13 passes through the center of the flow hole 111, and there are two blades 123 that are both rotatably connected to the connecting shaft 13. As a result, the blades 123 can be arranged substantially symmetrically with respect to the connecting shaft 13, thereby ensuring When the liquid passes through the flow hole 111 when the two blades 123 are opened, the flow velocity of each part of the liquid is substantially equal, thereby ensuring the smooth flow of the liquid.

Further, the flow hole 111 is a tapered hole arranged in a first direction, the outer edge of the blade 123 is a curved surface that matches the wall surface of the tapered hole, and the flow hole 111 is set as a tapered hole. A limit is formed on the blade 123, so as to ensure that the blade 123 does not continue to rotate after it rotates to block the flow hole 111. On the other hand, the sealing performance when the blade 123 blocks the flow hole 111 can also be enhanced.

Further, the one-way valve 10 can be made of metal materials or polymer materials, such as titanium alloy, stainless steel, aluminum alloy, magnesium aluminum alloy, nickel alloy, polyethylene, polypropylene, nylon, polyether ether ketone, and polytetrafluoroethylene. At least one of ethylene, polyoxymethylene, ABS, PBT, and polyphenylene sulfide.

In some embodiments of the present invention, the fixing portion 11 is a fixing ring, and the outer diameter of the fixing ring can be adapted to the inner diameter of the catheter body 20 to ensure the assembly stability between the fixing ring and the catheter body 20. Further, the fixing ring and the catheter body 20 can be connected by two-shot injection molding, bonding, suture, stent fixation, and the like.

The embodiment of the second aspect of the present invention proposes a medical catheter 100, which includes a catheter body 20 and a one-way valve 10 provided in the catheter body 20. The one-way valve 10 is the one-way valve 10 in any of the above-mentioned embodiments. .

The medical catheter 100 according to the embodiment of the present invention includes a catheter body 20 and a one-way valve 10 provided in the catheter body 20. The one-way valve 10 includes a fixed portion 11 and a deformed portion 12, and the deformed portion 12 can be used in the medical catheter. The liquid in the catheter body 20 of 100 switches between the first form and the second form. When the deformed part 12 is in the first form, the overflow hole 111 on the fixed part 11 is blocked, and the deformed part 12 is in the second form. In the configuration, the blocking of the flow hole 111 is released, and when the liquid in the catheter body 20 flows in the first direction, the deformed portion 12 is driven into the first configuration, and when the liquid in the catheter body 20 flows in the second direction, the deformed portion is driven 12 enters the second form, thereby ensuring that the liquid in the duct body 20 can only pass through the flow hole 111 when flowing in the second direction, thereby realizing the unidirectional flow of the liquid in the duct body 20. Since the one-way valve 10 has a purely mechanical structure, it does not need to be controlled by an electric circuit, nor does it need to consider the sealing problem in a liquid environment, so the structure is relatively simple and the manufacturing cost is relatively low.

The above are only the preferred specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or changes within the technical scope disclosed by the present invention. All replacements shall be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

A one-way valve for medical catheters, characterized in that the one-way valve includes:

A fixing part, the fixing part is used to connect the inner wall of the catheter body of the medical catheter, and the fixing part is provided with a flow hole;

A deformed portion, the deformed portion is connected to the fixed portion, the deformed portion has a first form and a second form, and when the deformed portion is in the first form, the flow hole is blocked, the deformed portion When in the second form, the blocking of the flow hole is released. When the liquid in the catheter body flows in the first direction, the deformed portion is driven into the first form, and the liquid in the catheter body flows along the first form. When flowing in two directions, the deformed portion is driven into the second form.
The one-way valve according to claim 1, wherein the deformed portion comprises a plurality of bionic valves, the mouths are formed between the plurality of bionic valves, and the ends of the plurality of bionic valves are along the The liquid flowing in the first direction can approach each other to close the mouth, and the ends of multiple pieces of the bionic valve can move away from each other under the action of the liquid flowing in the second direction to close the mouth. Department opened.
The one-way valve according to claim 2, wherein the number of the bionic valve is three.
The one-way valve according to claim 2, wherein the bionic valve is made of polyethylene, polypropylene, nylon, polyetheretherketone, polytetrafluoroethylene, polyoxymethylene, ABS, PBT, polystyrene One of the thioethers.
The one-way valve according to claim 1, wherein the deformed portion is a blade that is rotatably connected with the fixed portion.
The one-way valve according to claim 5, wherein the number of blades is two, and the one-way valve further comprises a connecting shaft arranged in the flow hole, and the connecting shaft passes through the flow hole. In the center of the hole, the two blades are both rotatably connected with the connecting shaft.
The one-way valve according to claim 6, wherein the flow hole is a tapered hole that is tapered along the first direction, and the outer edge of the blade is connected to the tapered hole. A curved surface that matches the wall surface.
The one-way valve of claim 5, wherein the one-way valve is made of titanium alloy, stainless steel, aluminum alloy, magnesium aluminum alloy, nickel alloy, polyethylene, polypropylene, nylon, polyether ether At least one of ketone, polytetrafluoroethylene, polyoxymethylene, ABS, PBT, and polyphenylene sulfide.
The one-way valve according to any one of claims 1 to 8, wherein the fixed part is a fixed ring.
A medical catheter, which is characterized by comprising a catheter body and a one-way valve arranged in the catheter body, the one-way valve being the one-way valve according to any one of claims 1 to 9.