Dispensing Device Snap-Fastening and Non-Return Valves
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Solution Overview
Problem
Existing product dispensing devices, particularly in the medical field, face challenges in preventing bacterial contamination due to inadequate sealing and risk of sterility loss, especially when using chemical preservative-free products.
Innovation Solution
A product dispensing device with a snap-fastening mechanism that securely attaches to the reservoir neck, featuring a clamping collar and outer ring to retain the dispensing nozzle, ensuring airtight and bacteria-proof sealing, combined with non-return valves for additional protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a simple dispensing device is used, then ease of operation is improved, but reliability of sealing against bacteria and liquids deteriorates
Solution Approach 1:
The device is divided into distinct functional segments: a pump unit with dosing chamber, a nozzle assembly with non-return valve, and a reservoir. Each segment has specific sealing interfaces that work together to maintain the preservative-free barrier while keeping the overall device simple to operate.
Solution Approach 2:
A non-return valve is introduced as an intermediary component between the reservoir and the external environment. This valve acts as a one-way barrier that allows product flow outward while preventing backward contamination, thereby improving sealing reliability without complicating user operation.
2Reliability
If chemical preservatives are eliminated from the product, then product safety and purity are improved, but the risk of bacterial contamination increases
Solution Approach 1:
The device incorporates preliminary protective measures through multiple non-return valves positioned at critical interfaces. These valves are pre-configured to prevent bacterial ingress before contamination can occur, addressing the increased vulnerability of preservative-free products without requiring post-contamination remediation.
Solution Approach 2:
The sealing system is designed with redundant barriers (multiple non-return valves and sealed interfaces) that provide a cushion of protection against potential bacterial contamination. This multi-layer approach ensures that even if one barrier is compromised, other barriers remain intact to protect the preservative-free product.
3Ease of repair
If the dispensing nozzle is easily removable, then ease of cleaning and maintenance is improved, but the risk of sterility loss and bacterial introduction increases
Solution Approach 1:
The nozzle assembly is designed as a disposable or replaceable component that can be easily removed and discarded after use. This eliminates the need for complex cleaning and sterilization procedures, while the low cost of replacement ensures that users will replace rather than risk reusing potentially contaminated nozzles, thereby maintaining sterility.
Data Source
Figure 1~2
Figure 3~4
AI summary
The product dispensing device (10) is added to the neck (14) of a container (12) and comprises: a pump (16) comprising a metering chamber closed by a first needle valve forming a nonreturn valve; a dispensing end piece (18) added to the pump and comprising a second needle valve (66) forming a nonreturn valve and a bearing surface on which a user can press to activate the device; a cap (20) for protecting the device; a clamping collar (22) bearing the cap; and a member (24) for fixing the device on the neck (14) of the container, said member comprising means (88) for attaching the member around the neck, that can be activated by sliding the collar (22) with respect to the fixing member (24) from a pre-assembly configuration to an assembly configuration, an inner ring (80) for centring the pump on the container, and an outer ring (82) carrying means (84) for securing the dispensing end piece.