A drug delivery device pad

Abstract

This invention provides a drug delivery device pad. The pad comprises an elastic outer layer, a sealing middle layer, and a leak-proof inner layer stacked sequentially, with the three layers integrally connected by heat fusion, adhesive bonding, or welding. The elastic outer layer is made of silicone or polyurethane, providing flexible cushioning to prevent relative sliding with the drug delivery device; the sealing middle layer is made of EPDM rubber or hydrogenated nitrile rubber, enhancing pressure resistance and long-term sealing performance; the leak-proof inner layer is made of fluororubber or polytetrafluoroethylene, forming an inert protective layer to block the risk of drug adsorption or oxidation. The layers are connected by an interlocking structure and a locking block-slot physical locking method, achieving double fixation and preventing peeling. This invention balances elastic deformation and structural stability, effectively solving the problems of easy deformation and damage, poor sealing performance, and drug adsorption in traditional pads, significantly improving the sealing reliability and drug protection performance of the drug delivery device.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, specifically to a sealing gasket for a drug delivery device. Background Technology

[0002] A drug delivery device is a tool used to deliver medication, offering advantages such as controllable dosage, ease of use, and adaptability to different dosage forms. The sealing gasket, a key component of the delivery device, is typically made of elastic material to prevent microorganisms and dust from entering through the container opening. Traditional delivery device gaskets are often made of single-layer rubber or foamed low-density polyethylene (LDPE). When placed in a sprayer, these gaskets are easily deformed and damaged by external forces, leading to drug leakage and contamination. Furthermore, foamed LDPE itself has poor airtightness and low barrier properties, which may cause oxidation or volatilization of the active pharmaceutical ingredient, or even adsorption of the drug solution, resulting in waste. Utility Model Content

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a drug delivery pad to solve several problems mentioned in the background art.

[0004] To achieve the above objectives, the technical solution provided by this utility model is a drug delivery device pad, comprising an elastic outer layer, a sealing middle layer, and a leak-proof inner layer stacked sequentially, the three layers being integrally connected by at least one of the following methods: hot melting, gluing, and welding.

[0005] Furthermore, the elastic outer layer is a silicone layer or a polyurethane layer with a thickness of 0.5-2 mm.

[0006] Furthermore, the sealing middle layer is a EPDM rubber layer or a hydrogenated nitrile rubber layer, with a thickness of 1-3 mm.

[0007] Furthermore, the impermeable inner layer is a fluororubber layer or a polytetrafluoroethylene layer, with a thickness of 0.1-0.5 mm.

[0008] Furthermore, the surface of the elastic outer layer is provided with anti-slip texture.

[0009] Furthermore, the elastic outer layer and the sealing middle layer are interlocked, and / or the sealing middle layer and the impermeable inner layer are interlocked.

[0010] Furthermore, a snap-fit ​​block is provided in the middle of the elastic outer layer and / or the impermeable inner layer extending into the sealing middle layer, and the sealing middle layer is provided with a snap-fit ​​groove adapted to the snap-fit ​​block.

[0011] Furthermore, the elastic outer layer, the sealing middle layer, and the impermeable inner layer are provided with through holes.

[0012] The advantages and beneficial effects of this utility model are as follows: This gasket provides flexible cushioning through an elastic outer layer, enhances pressure resistance and long-term sealing through a sealing middle layer, and provides inert protection through an impermeable inner layer, balancing elastic deformation requirements with structural stability. It can be flexibly adapted to various drug delivery devices. The interlayer locking blocks and slots are connected by methods such as heat fusion, achieving dual fixation through physical locking and chemical bonding to prevent interlayer peeling. The anti-slip texture on the surface of the elastic outer layer prevents sealing failure due to rotation of the delivery device. Attached Figure Description

[0013] Figure 1 This is a disassembly diagram of the present invention;

[0014] Reference numerals: 1-Elastic outer layer, 2-Sealing middle layer, 3-Imperible inner layer, 4-Anti-slip texture, 5-Snap-fit ​​block, 6-Slot, 7-Through hole. Detailed Implementation

[0015] 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.

[0016] Example 1

[0017] A drug delivery device pad includes a silicone elastic outer layer 1 with a thickness of 0.5 mm, a EPDM rubber sealing middle layer 2 with a thickness of 1 mm, and a fluororubber anti-seepage inner layer 3 with a thickness of 0.5 mm, which are stacked sequentially. The three layers are integrally connected by a hot-melt process.

[0018] Example 2

[0019] A drug delivery device pad includes a 2mm thick polyurethane elastic outer layer 1, a 3mm thick hydrogenated nitrile rubber sealing middle layer 2, and a 0.1mm thick polytetrafluoroethylene leak-proof inner layer 3, which are stacked sequentially. The three layers are integrally connected by an adhesive bonding process.

[0020] Example 3

[0021] A drug delivery device pad includes a silicone elastic outer layer 1 with a thickness of 1.5 mm, a EPDM rubber sealing middle layer 2 with a thickness of 2 mm, and a fluororubber anti-seepage inner layer 3 with a thickness of 0.3 mm, which are stacked sequentially. The three layers are integrally connected by welding.

[0022] Example 4

[0023] A drug delivery device pad includes a silicone elastic outer layer 1 with a thickness of 1 mm, a EPDM rubber sealing middle layer 2 with a thickness of 1.5 mm, and a fluororubber anti-seepage inner layer 3 with a thickness of 0.2 mm, which are stacked sequentially. The three layers are integrally connected by a hot-melt process. The surface of the elastic outer layer 1 is provided with a wavy anti-slip texture 4 with a texture depth of 0.2 mm and a texture spacing of 0.5 mm.

[0024] Example 5

[0025] A drug delivery device pad includes a polyurethane elastic outer layer 1 with a thickness of 0.8 mm, a hydrogenated nitrile rubber sealing middle layer 2 with a thickness of 2 mm, and a polytetrafluoroethylene anti-seepage inner layer 3 with a thickness of 0.4 mm, which are stacked in sequence and connected as a whole by a hot-melt process.

[0026] A snap-fit ​​block 5 with a diameter of 2 mm and a height of 0.5 mm is provided in the middle of the elastic outer layer 1 and extends towards the sealing middle layer 2; a matching slot 6 with a depth of 0.5 mm is provided in the corresponding position of the sealing middle layer 2, and the snap-fit ​​block and the slot are fitted together.

[0027] Example 6

[0028] A drug delivery device pad includes a silicone elastic outer layer 1 with a thickness of 1.2 mm, a EPDM rubber sealing middle layer 2 with a thickness of 2.5 mm, and a fluororubber anti-seepage inner layer 3 with a thickness of 0.3 mm, which are stacked sequentially. The three layers are integrally connected by an adhesive bonding process. The elastic outer layer 1, the sealing middle layer 2, and the anti-seepage inner layer 3 are provided with through holes 7 with a diameter of 8 mm.

[0029] The working principle of this invention lies in the following: the elastic outer layer provides flexible cushioning, adapting to the inner side of the cap of the delivery device opening through deformation, absorbing external impacts and preventing gasket deformation; the sealing middle layer resists long-term compressive stress, blocking the permeation paths of microorganisms and gases; the impermeable inner layer has the advantage of chemical inertness, isolating the drug from external reactions and preventing drug adsorption or component volatilization. The interlocking structure between the layers enhances the connection strength through mechanical interlocking, and the three layers can be integrally connected by welding, gluing, heat fusion, etc., with anti-slip texture increasing the friction of the contact surface. The through hole adapts to the tubular structure of spray-type delivery devices, and the functions of each layer complement each other, maintaining the overall structural stability and long-term sealing reliability during dynamic use.

[0030] 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 drug delivery device pad, characterized in that, It includes an elastic outer layer (1), a sealing middle layer (2), and an impermeable inner layer (3) stacked in sequence, wherein the elastic outer layer (1), the sealing middle layer (2), and the impermeable inner layer (3) are integrally connected by at least one of the following methods: hot melting, gluing, or welding.

2. The applicator pad according to claim 1, characterized in that, The elastic outer layer (1) is a silicone layer or a polyurethane layer with a thickness of 0.5-2 mm.

3. The applicator pad according to claim 1, characterized in that, The sealing middle layer (2) is a EPDM rubber layer or a hydrogenated nitrile rubber layer with a thickness of 1-3 mm.

4. The applicator pad according to claim 1, characterized in that, The impermeable inner layer (3) is a fluororubber layer or a polytetrafluoroethylene layer with a thickness of 0.1-0.5 mm.

5. The applicator pad according to any one of claims 1-4, characterized in that, The surface of the elastic outer layer (1) is provided with anti-slip texture (4).

6. The applicator pad according to claim 5, characterized in that, The elastic outer layer (1) and the sealing middle layer (2), and / or the sealing middle layer (2) and the impermeable inner layer (3) are connected by an interlocking method.

7. The applicator pad according to claim 6, characterized in that, The elastic outer layer (1) and / or the impermeable inner layer (3) are provided with a snap-fit ​​block (5) extending from the middle of the sealing middle layer (2), and the sealing middle layer (2) is provided with a snap-fit ​​groove (6) adapted to the snap-fit ​​block (5).

8. The applicator pad according to any one of claims 1-4, characterized in that, The elastic outer layer (1), the sealing middle layer (2), and the impermeable inner layer (3) are provided with through holes (7).

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