A medical injection check valve

Abstract

This invention provides a medical injection one-way valve, comprising a front housing and a rear housing connected together, forming a cavity between them and extending a connecting tube communicating with the cavity. A limiting block is provided within the cavity of the rear housing, and a gasket valve core overlaps within the cavity of the front housing, with a gap between the gasket valve core and the limiting block on the side closest to the rear housing. The contact surface between the gasket valve core and the front housing has a recessed portion with radially distributed reinforcing ribs. When fluid flows in the forward direction, it impacts the gasket valve core, causing it to deform and contact the limiting block, forming a stable passage through the gap; when flowing in the reverse direction, the non-recessed surface is pressed tightly against the front housing, blocking the backflow. This invention increases the pressure resistance of the gasket in the one-way valve to 500 kPa, effectively solving the problems of easy bulging and insufficient sealing of traditional diaphragm valve cores.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, specifically to a one-way valve for infusion or blood transfusion, and in particular a medical injection one-way valve. Background Technology

[0002] A one-way valve is a device that allows fluid to flow in only one direction. It prevents backflow through its mechanical design. In medical devices, one-way valves for infusions or blood transfusions are typically integrated into infusion lines, blood transfusion sets, and infusion pumps to ensure that the fluid flows only in a preset direction, preventing backflow of blood / medication, contamination, or blockage of the equipment due to pressure changes or operational errors. A one-way valve usually includes a housing and a valve core. When the infusion pump or gravity drives the fluid to flow in the forward direction, the valve core, with its gasket structure, opens the passage under pressure. When a pressure difference occurs during infusion, the valve core automatically closes, preventing backflow of fluid or blood. However, the gasket in a traditional valve core, such as the diaphragm in the diaphragm-type one-way valve shown in utility model patent CN210196569U, is simply a circular plate, which will rupture under pressure of around 300 kPa. Utility Model Content

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a one-way valve with higher pressure resistance. To achieve the above objective, the technical solution provided by this invention is as follows.

[0004] A medical injection one-way valve includes a front housing and a rear housing connected together. A cavity is left between the front housing and the rear housing, and a connecting tube extending from the end face of the two housings away from the cavity is provided to communicate with the cavity. A limit block is provided in the rear housing extending from the front housing within the cavity. A gasket valve core is overlapped in the front housing within the cavity. A gap is left between the gasket valve core and the limit block on the side of the gasket valve core near the rear housing. A recess is provided on the mating surface of the gasket valve core and the front housing. The recess is provided with reinforcing ribs distributed radially.

[0005] When fluid flows from the front housing through the cavity to the rear housing, the fluid impacts the gasket valve core, causing the gasket valve core to abut against the limiting block. After the gasket valve core deforms, the fluid flows through the gap between the gasket valve core and the front housing to the rear housing. When the fluid stops flowing, the gasket valve core returns to its original shape, forming a seal, thus achieving unidirectional flow of the fluid. To explain, when the fluid flows in the opposite direction, the non-concave surface of the gasket valve core is pressed, causing it to abut against the inside of the front housing, preventing the fluid from flowing in the opposite direction.

[0006] Furthermore, the front housing has guide posts on the outer periphery of the cavity, forming flow channels between adjacent guide posts. When fluid impacts the gasket valve core, the edge of the gasket valve core deforms, connecting the flow channels and reducing unnecessary flow resistance. At the same time, the annularly distributed guide posts also provide radial limiting for the gasket valve core, preventing it from tilting.

[0007] Furthermore, the front housing and the rear housing are fitted together. The fitting method includes, but is not limited to, threads, snap-fit ​​connections, etc. After fitting, the two can be integrally connected by rotational friction, ultrasonic welding, hot melt welding, or other welding methods to improve the sealing effect of the one-way valve.

[0008] Furthermore, the front housing and the gasket valve core are connected by a stepped structure with rounded corners. The rounded corners of the stepped structure provide a good sealing fit while reducing the resistance of the right-angle connection and minimizing drug residue.

[0009] Furthermore, the gasket valve core includes a pressure-resistant sheet and a support sheet that are fitted together, with the recessed portion disposed on the pressure-resistant sheet. This separate structure also facilitates the creation of reinforcing ribs through molding when the pressure-resistant sheet is molded separately, reducing the complexity of the manufacturing process. The pressure-resistant sheet and the support sheet can be integrally connected by gluing, welding, or other methods.

[0010] Furthermore, the front housing has an annular groove on the outer periphery of the connecting pipe, the annular groove being used to install O-rings and / or elastic sealing rings.

[0011] Furthermore, the connecting pipe is one of a tapered pipe or a Luer connector pipe.

[0012] Furthermore, the limiting block is a cylindrical body with a notch.

[0013] Furthermore, the recessed portion has 20-40 reinforcing ribs evenly distributed, with the length of the reinforcing ribs being 0.5-1cm and the diameter being 0.5-1mm.

[0014] Furthermore, the pressure-resistant sheet is made of silicone, and the support sheet is made of plastic with a thickness of 0.2-1mm.

[0015] The advantages and beneficial effects of this utility model are as follows: the concave portion of the radial reinforcing ribs enables controllable deformation and rapid response of the valve core. During forward flow, fluid impact causes the valve core to deform and contact the limiting block, forming a stable passage through the gap. During reverse flow, the non-concave surface is pressed tightly against the front housing, avoiding the risk of backflow. The pressure-resistant plate provides elastic deformation capability while the support plate ensures mechanical strength. The one-way valve using this gasket valve core achieves a pressure resistance of 500 kPa. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of a traditional gasket;

[0017] Figure 2 This is a front view schematic diagram of the valve core gasket of this utility model;

[0018] Figure 3 This is a side sectional view of the valve core gasket of this utility model;

[0019] Figure 4 This is a schematic diagram of the one-way valve of this utility model;

[0020] Figure 5 This is a cross-sectional structural schematic diagram of the one-way valve of this utility model;

[0021] Figure 6 This is an enlarged structural schematic diagram of the one-way valve A of this utility model;

[0022] Figure 7 This is a schematic diagram of the combined structure of the valve core gasket and the rear housing of this utility model;

[0023] Figure 8 This is a three-dimensional structural diagram of the front housing of the one-way valve of this utility model;

[0024] Figure 9 This is a three-dimensional structural diagram of the rear housing of the one-way valve of this utility model;

[0025] Figure label:

[0026] 1-Front housing, 2-Rear housing, 3-Cavity, 4-Gasket valve core, 5-Connecting pipe, 6-Limiting block, 7-Recessed part, 8-Reinforcing rib, 9-Guide post, 10-Step with rounded corners, 11-Pressure-resistant plate, 12-Support plate, 13-Annular groove. Detailed Implementation

[0027] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings and examples. The following examples are only used to more clearly illustrate the technical solution of this utility model and should not be construed as limiting the scope of protection of this utility model.

[0028] Example 1

[0029] A medical injection check valve, please refer to Figures 2-7 It includes a front housing 1 and a rear housing 2 connected by a threaded fitting. A cavity 3 is left between the front housing 1 and the rear housing 2. A connecting pipe 5, which is a Luer connector pipe, extends from the end face of the front housing 1 and the rear housing 2 away from the cavity 3. A limiting block 6, which is a notched cylindrical body, is provided on the rear housing 2 extending from the front housing 1 within the cavity 3. A gasket valve core 4 is overlapped in the front housing 1 within the cavity 3. A 1mm gap is left between the gasket valve core 4 and the limiting block 6 on the side of the gasket valve core 4 closest to the rear housing 2. A recessed part 7 is provided on the contact surface of the gasket valve core 4 and the front housing 1. Forty reinforcing ribs 8 with a diameter of 0.8mm and a length of 0.7cm are radially distributed in the recessed part 7. An annular groove 13 is provided between the front housing 1 and the integrally formed connecting pipe. The annular groove 13 can be used to install silicone O-rings and sealing gaskets during use.

[0030] Example 2

[0031] A medical injection check valve differs from Embodiment 1 in that the front housing 1 is fitted to the rear housing 2 via a snap-fit ​​structure, and the contact surface is provided with an arc-shaped rounded step 10 to position the gasket valve core 4. The gasket valve core 4 is composed of a silicone pressure-resistant sheet 11 and a PP (polypropylene) plastic support sheet 12 bonded together. The limiting block 6 is a PEEK (polyetheretherketone) cylinder with three notches, and the gap between it and the valve core is controlled at 0.2 mm. The connecting tube 5 is a tapered tube, and six guide posts 9 are provided.

[0032] Example 3

[0033] A medical injection check valve differs from Embodiment 1 in that the annular groove 13 is compositely equipped with a fluororubber O-ring and a spring sealing ring, and the connecting tube 5 adopts a Luer connector. The reinforcing ribs 8 are composed of 40 titanium alloy wires, each with a diameter of 1 mm and a length of 1 cm, embedded in the silicone pressure-resistant sheet 11.

[0034] Example 4

[0035] A medical injection check valve differs from Embodiment 1 in that the rear housing limiting block 6 is a medical-grade PC cylinder with a cross-shaped notch. The support plate 12 is made of medical-grade POM (polyoxymethylene) plastic with an antibacterial coating sprayed on its surface.

[0036] Example 5

[0037] A medical injection check valve differs from Embodiment 1 in that the front housing 1 and the rear housing 2 are ultrasonically welded, and a PP guide post 9 with an arc-shaped step 10 is installed in the cavity 3. The gasket valve core 4 consists of a three-layer structure: an upper silicone pressure-resistant sheet 11 with 35 0.6mm reinforcing ribs 8, a middle PET (polyethylene terephthalate) support mesh, and a lower TPE (thermoplastic elastomer) buffer layer. The limiting block 6 has a honeycomb porous structure.

[0038] The working principle of this invention lies in the fact that the valve core gasket adopts a concave portion, combined with a pleated shape formed by reinforcing ribs, achieving a larger pressure-bearing area than traditional gaskets. Simultaneously, the radially distributed reinforcing ribs ensure uniform fluid flow to the outer periphery of the gasket valve core, preventing excessive flow in one direction. When fluid (such as medicine or blood) enters the cavity from the connecting pipe of the front housing, the fluid pressure acts on the concave surface of the gasket valve core. After the gasket valve core abuts against the limiting block, the fluid impact causes the pressure-resistant sheet to elastically deform, bending towards the rear housing. The fluid bypasses the gasket valve core and replenishes the cavity, then continues flowing through the notched cylinder. During this process, after the gasket valve core contacts the limiting block, the deformation amplitude of the gasket valve core is limited, forming uniform micro-gaps through which the fluid flows stably to the connecting pipe of the rear housing. When the fluid stops flowing, the silicone pressure-resistant sheet quickly returns to its original position due to its elastic restoring force, disengaging from the limiting block and re-sealing with the contact surface of the front housing, preventing accidental leakage.

[0039] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A medical injection check valve, comprising a front housing (1) and a rear housing (2) connected in combination, wherein a cavity (3) is formed between the front housing (1) and the rear housing (2), and a connecting tube (5) communicating with the cavity (3) extends from the end faces of the two housings away from the cavity (3), characterized in that: The rear housing (2) extends into the front housing (1) within the cavity (3) and is provided with a limiting block (6). The front housing (1) has a gasket valve core (4) overlapping in the cavity (3), and the gasket valve core (4) has a gap between the side of the rear housing (2) and the limiting block (6). The gasket valve core (4) and the front housing (1) are provided with a recess (7), and the recess (7) is provided with reinforcing ribs (8) arranged radially.

2. The medical injection check valve according to claim 1, characterized in that: The front housing (1) has guide posts (9) on the outer periphery of the cavity (3), and flow channels are formed between adjacent guide posts (9).

3. The medical injection check valve according to claim 2, characterized in that: The front housing (1) and the rear housing (2) are fitted together.

4. The medical injection check valve according to claim 3, characterized in that: The front housing (1) and the gasket valve core (4) are connected by a step (10) with rounded corners.

5. The medical injection check valve according to any one of claims 1-4, characterized in that: The gasket valve core (4) includes a pressure-resistant sheet (11) and a support sheet (12) that are fitted together, and the recess (7) is disposed on the pressure-resistant sheet (11).

6. The medical injection check valve according to any one of claims 1-4, characterized in that: The front housing (1) has an annular groove (13) on the outer periphery of the connecting pipe (5), and the annular groove (13) is used to install O-rings and / or elastic sealing rings.

7. The medical injection check valve according to any one of claims 1-4, characterized in that: The connecting pipe (5) is a tapered pipe or a Luer connector pipe.

8. The medical injection check valve according to any one of claims 1-4, characterized in that: The limiting block (6) is a cylinder with a notch.

9. The medical injection check valve according to claim 5, characterized in that: The pressure-resistant sheet (11) is a silicone sheet, and the support sheet (12) is a plastic sheet with a thickness of 0.2-1mm.

10. The medical injection check valve according to claim 9, characterized in that: The recessed portion (7) has 20-40 reinforcing ribs (8) evenly distributed, with each reinforcing rib (8) having a length of 0.5-1cm and a diameter of 0.5-1mm.

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