Infusion set and catheter device

Abstract

This utility model discloses an infusion connector and an indwelling needle device, comprising: a connector having an inner cavity, the connector having a first connection port and a second connection port communicating with its inner cavity; an elastic seal fixedly connected in the inner cavity of the connector, a gap being provided between the elastic seal and the inner wall of the connector, the elastic seal at least partially abutting against the wall of the first connection port to close the first connection port, the elastic seal being configured to deform under external force to form a gap between the elastic seal and the wall of the first connection port; and an antifoaming layer disposed on the outer surface of the elastic seal. This infusion connector provides an antifoaming layer on the outer surface of the elastic seal to prevent air bubbles from adhering to the elastic seal, thereby preventing air bubbles from being introduced into the body during infusion.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, specifically an infusion connector and an indwelling needle device. Background Technology

[0002] In clinical use, needle-free infusion connectors are often added as extra accessories to disposable intravenous catheter products, such as positive pressure needle-free infusion connectors and septated membrane needle-free infusion connectors. During the infusion and air release process, the internal elastic seal of the positive pressure needle-free infusion connector is compressed and deformed, forming a corrugated area. This corrugated area is prone to air bubbles adhering to it, and excessive air bubbles introduced into the body can affect human safety. Summary of the Invention

[0003] In order to overcome the defects in the prior art, this utility model provides an infusion connector and an indwelling needle device. The infusion connector has an antifoaming layer on the outer surface of the elastic seal to prevent air bubbles from adhering to the elastic seal, thereby preventing air bubbles from being introduced into the human body during infusion.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is: an infusion connector, comprising:

[0005] A connector having an inner cavity, the connector having a first connection port and a second connection port communicating with its inner cavity;

[0006] An elastic seal is fixedly connected in the inner cavity of the connector, and a gap is provided between the elastic seal and the inner wall of the connector. The elastic seal at least partially abuts against the wall of the first connection port to close the first connection port. The elastic seal is configured to deform under external force to form a gap between the elastic seal and the wall of the first connection port.

[0007] An antifoaming layer is disposed on the outer surface of the elastic seal.

[0008] The above technical solution involves providing an anti-foaming layer on the outer surface of the elastic seal to prevent air bubbles from adhering to the elastic seal, thereby preventing air bubbles from being introduced into the human body during infusion.

[0009] Furthermore, the defoaming layer comprises one or a combination of two of polyvinylpyrrolidone and polyethylene glycol. The defoaming layer made of polyvinylpyrrolidone and polyethylene glycol can disrupt the stability of bubbles, thereby preventing bubble adhesion.

[0010] Furthermore, the defoaming layer is 3μm to 5μm thick.

[0011] Furthermore, a limiting post is provided within the connecting body, and the elastic seal and the connecting body are fixedly connected. The limiting post facilitates the fixation of the elastic seal.

[0012] Furthermore, the elastic seal includes a neck that passes through the first connection port and a base connected to the neck. The base is a hollow cylinder. One end of the base away from the neck is sleeved on the limiting post. The limiting post is provided with an exhaust hole, which connects the hollow area of ​​the base to the external environment.

[0013] With the above technical solution, when the elastic seal is squeezed by external force, the air in the base of the hollow cylinder is discharged from the exhaust hole.

[0014] Furthermore, the neck of the elastic seal is provided with a notch. When the elastic seal is subjected to external force, due to the presence of the notch, the elastic seal is more likely to deform, causing a gap to form between the elastic seal body and the wall of the first connection port.

[0015] Furthermore, the connection between the neck and base of the elastic seal is frustum-shaped. The diameter of the upper base of the frustum is less than or equal to the diameter of the first connection port, and the diameter of the lower base of the frustum is greater than the diameter of the first connection port but less than the diameter of the inner cavity of the connector. The lower base of the frustum is fixedly connected to the base. With this design, when no external force is applied, the frustum fits tightly against the inner end of the first connection port under the action of elastic force, ensuring the closure of the first connection port.

[0016] Furthermore, a sidewall flow channel is provided on the wall surface of the connector, which connects the inner cavity of the connector and the second connection port from within the wall surface. Liquid flowing into the inner cavity of the connector can flow to the second connection port through the sidewall flow channel.

[0017] Furthermore, the connector includes:

[0018] A housing having an inner cavity, and the housing having a first connection port and an opening;

[0019] A base, which is detachably connected to the opening of the housing, and the base is provided with a second connection port;

[0020] The limiting post is mounted on the base.

[0021] With the above technical solution, when assembling the infusion connector, the elastic seal and the limiting post on the base can be connected and fixed first, and then the base and the shell can be connected and fixed.

[0022] An indwelling needle device using the above-mentioned infusion connector includes a needle assembly, a catheter connected to the needle assembly, and a flow stop clamp disposed on the catheter. The second connection port of the infusion connector is connected to one end of the catheter away from the needle assembly.

[0023] Based on the above technical solution, the beneficial effects of this utility model are as follows:

[0024] The infusion connector disclosed in this application has an anti-foaming layer on the outer surface of the elastic seal to prevent air bubbles from adhering to the elastic seal, thereby preventing air bubbles from being introduced into the human body during infusion.

[0025] This application provides a frustum structure between the neck and base of the elastic seal, which can ensure the sealing performance of the infusion connector when it is not in use.

[0026] To make the above and other objects, features and advantages of this utility model more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a cross-sectional view of the overall device of the infusion connector in this embodiment of the utility model;

[0029] Figure 2 This is a cross-sectional view of the connector in an embodiment of this utility model;

[0030] Figure 3 This is a cross-sectional view of the elastic seal in an embodiment of this utility model;

[0031] Figure 4 This is a cross-sectional view of other connectors connecting to the infusion connector in this embodiment of the present invention;

[0032] Figure 5 This is a schematic diagram of the indwelling needle device in an embodiment of this utility model.

[0033] The reference numerals in the above figures are as follows: 11, first connection port; 12, second connection port; 13, housing; 14, base; 141, limiting post; 1411, vent hole; 1412, liquid flow channel; 15, side wall flow channel; 2, elastic seal; 21, neck; 211, notch; 22, base; 23, frustum; 3, other connectors; 4, needle assembly; 5, conduit; 6, flow stop clamp. Detailed Implementation

[0034] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0035] It should be noted that in the description of this utility model, the terms "first," "second," etc., are used only for descriptive purposes and to distinguish similar objects; there is no order between them, nor should they be construed as indicating or implying relative importance. Furthermore, in the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0036] Example: This example discloses an infusion connector, comprising:

[0037] A connector having an inner cavity, and the surface of the connector having a first connection port 11 and a second connection port 12 communicating with the inner cavity.

[0038] In some feasible embodiments, such as Figure 2 As shown, the connector includes a housing 13 and a base 14 detachably connected to the housing 13. The housing 13 has an inner cavity and a first connection port 11 for connecting other connectors 3 externally. The housing 13 also has an opening. The base 14 is detachably connected to the opening of the housing 13 and has a second connection port 12. The housing 13 and the base 14 can be connected by a threaded connection or a snap-fit ​​connection. It should be noted that the housing 13 and the base 14 are also provided with sealing rings.

[0039] An elastic sealing element 2 is provided in the inner cavity of the connector. The elastic sealing element 2 is fixed in the inner cavity of the connector, and a gap is provided between the elastic sealing element 2 and the inner wall of the connector. The elastic sealing element 2 at least partially abuts against the wall surface of the first connection port 11 to close the first connection port 11. Under the action of external force, the elastic sealing element 2 can deform to create a gap between the elastic sealing element 2 and the wall surface of the first connection port 11.

[0040] In some feasible embodiments, combined with Figure 1 , 3As shown, the elastic seal 2 includes a neck 21 that passes through the first connection port 11, and a base 22 connected to the neck 21. The base 22 is a hollow cylinder. A limiting post 141 is provided on the base 14. One end of the base 22 opposite to the neck 21 is sleeved on the limiting post 141. The limiting post 141 is provided with a vent hole 1411, which connects the hollow area of ​​the base 22 to the external environment.

[0041] The base 22 of the elastic seal 2 and the limiting post 141 can be sealed with heat shrink tubing.

[0042] In some feasible embodiments, the limiting post 141 extends from the second connection port 12 toward the side opposite to the base 14. The limiting post 141 is also provided with a liquid flow channel 1412, which communicates with the second connection port 12.

[0043] When assembling the above-mentioned infusion connector, first connect and fix the base 22 of the elastic seal 2 and the limiting post 141 on the base 14, and then connect and fix the base 14 and the housing 13.

[0044] When assembled into an infusion connector using the above technical solution, other connectors 3 are connected to the first connection port 11. Under the compression of the other connectors 3, the air in the base 22 of the elastic seal 2 is discharged from the vent 1411. The elastic seal 2 deforms under force, creating a gap between the body of the elastic seal 2 and the wall of the first connection port 11 for liquid to flow through. The fluid flows into the inner cavity of the housing 13 from the gap and flows out through the second connection port 12.

[0045] Before infusion, the indwelling needle device needs to be vented. During this venting process, the elastic seal inside the infusion connector is compressed and deformed, forming a corrugated area. Air bubbles easily adhere to this corrugated area, and excessive air bubbles entering the body can affect human safety. Therefore, to eliminate air bubbles, this application provides an antifoaming layer on the outer surface of the elastic seal 2. The antifoaming layer comprises one or a combination of polyvinylpyrrolidone (PVP) and polyethylene glycol (PEG). The antifoaming layer made of PPVP and PEG can disrupt the stability of air bubbles, thereby preventing their adhesion.

[0046] In this process, polyvinylpyrrolidone molecules are adsorbed onto the surface of the bubble liquid film through their hydrophilic groups, forming a dense polymer film. This film alters the original elasticity of the liquid film, reducing its stability and causing the bubbles to rupture due to uneven stress. Polyethylene glycol significantly reduces the overall surface tension of the liquid, weakening the bubble film's strength. Its ether bonds form hydrogen bonds with water molecules, further compromising foam stability.

[0047] In some feasible embodiments, the defoaming layer is applied to the surface of the elastic sealant by dip coating or ultrasonic spraying, and the thickness of the defoaming layer is 3μm to 5μm.

[0048] In some feasible embodiments, the connection between the neck 21 and the base 22 of the elastic seal 2 is frustum-shaped, the diameter of the upper bottom surface of the frustum 23 is less than or equal to the diameter of the first connection port 11, the diameter of the lower bottom surface of the frustum 23 is greater than the diameter of the first connection port 11 but less than the diameter of the inner cavity of the housing 13, and the lower bottom surface of the frustum 23 is fixedly connected to the base 22.

[0049] With the above scheme, when no external force is applied, the frustum 23 fits tightly against the inner end of the first connection port 11 under the action of elastic force, so as to ensure that the first connection port 11 is closed.

[0050] In some feasible embodiments, the neck 21 of the elastic seal 2 is provided with a notch 211. When the elastic seal 2 is subjected to external force, due to the presence of the notch 211, the elastic seal 2 is more likely to deform, causing a gap between the body of the elastic seal 2 and the wall of the first connection port 11.

[0051] In some feasible embodiments, a sidewall flow channel 15 is provided on the wall surface of the connector, and the sidewall flow channel 15 connects the inner cavity of the connector and the second connection port 12 from the inside of the wall surface.

[0052] Through the above technical solution, the liquid flowing into the inner cavity of the connector can flow directly from the inner cavity of the connector into the second connection port 12 through the liquid flow channel 1412, or flow into the second connection port 12 through the side wall flow channel 15.

[0053] This application also discloses an indwelling needle device, such as Figure 5 As shown, it includes a needle assembly 4, a catheter 5 connected to the needle assembly 4, and a stop clamp 6 disposed on the catheter. The second connection port 12 of the infusion connector is connected to the end of the catheter 5 away from the needle assembly 4.

[0054] This utility model uses specific embodiments to illustrate the principle and implementation of the utility model. The above description of the embodiments is only for the purpose of helping to understand the method and core idea of ​​the utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation and application scope based on the idea of ​​the utility model. Therefore, the content of this specification should not be construed as a limitation of the utility model.

Claims

1. An infusion connector, comprising: include: A connector having an inner cavity, the connector having a first connection port and a second connection port communicating with its inner cavity; An elastic seal is fixedly connected in the inner cavity of the connector, and a gap is provided between the elastic seal and the inner wall of the connector. The elastic seal at least partially abuts against the wall of the first connection port to close the first connection port. The elastic seal is configured to deform under external force to form a gap between the elastic seal and the wall of the first connection port. An antifoaming layer is disposed on the outer surface of the elastic seal.

2. The infusion adapter of claim 1, wherein, The defoaming layer comprises one or a combination of two of polyvinylpyrrolidone and polyethylene glycol.

3. The infusion adapter of claim 2, wherein, The defoaming layer is 3μm to 5μm thick.

4. The infusion adapter of claim 1, wherein, A limiting post is provided in the connecting body, and the elastic seal and the connecting are fixedly connected.

5. The infusion adapter of claim 4, wherein the first and second ends of the first and second conduits are configured to be connected to a first and second catheter, respectively. The elastic seal includes a neck that passes through the first connection port and a base connected to the neck. The base is a hollow cylinder. One end of the base away from the neck is sleeved on the limiting post. The limiting post is provided with an exhaust hole, which connects the hollow area of ​​the base to the external environment.

6. The infusion adapter of claim 5, wherein the first and second ends of the first and second conduits are configured to be connected to a first and second catheter, respectively. The neck of the resilient seal is provided with a notch.

7. The infusion adapter of claim 6, wherein the first and second ends of the first and second conduits are configured to be connected to a first and second catheter, respectively. The connection between the neck and the base of the elastic seal is frustum-shaped. The diameter of the upper base of the frustum is less than or equal to the diameter of the first connection port, and the diameter of the lower base of the frustum is greater than the diameter of the first connection port but less than the diameter of the inner cavity of the connector. The lower base of the frustum is fixedly connected to the base.

8. The infusion adapter of claim 1, wherein, The wall surface of the connector is provided with a side wall flow channel, which connects the inner cavity of the connector and the second connection port from the inside of the wall surface.

9. The infusion adapter of claim 4, wherein, The connector includes: A housing having an inner cavity, and the housing having a first connection port and an opening; A base, which is detachably connected to the opening of the housing, and the base is provided with a second connection port; The limiting post is mounted on the base.

10. A catheter assembly using the infusion adapter of any one of claims 1-9, wherein, It includes a needle assembly, a catheter connected to the needle assembly, and a flow stop clamp disposed on the catheter. The second connection port of the infusion connector is connected to the end of the catheter opposite to the needle assembly.

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