Dosing Syringe Adapter Seal to Prevent Drug Wastage and Soiling
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Solution Overview
Problem
Dosing syringes with adapters suffer from issues such as drug wastage, soiling, and discomfort during administration, particularly for children and individuals with limited mobility, due to inadequate sealing and design that can cause pain or injury.
Innovation Solution
A dosing syringe and adapter system that ensures liquid-tight coupling, preventing drug contact with the syringe's outer surface and allowing easy disengagement, with a hemispherical or elliptical proximal end and complementary seat design for snap-fit engagement, ensuring precise and safe drug aspiration without soiling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a pointed end syringe is used, then the aspiration of drug is facilitated, but the syringe may hit parts of the mouth causing pain and injury
Solution Approach 1:
The invention inverts the traditional pointed end design by providing a syringe with a flat proximal end instead of a pointed tip. This inversion maintains the aspiration function while eliminating the harmful effect of the pointed end hitting the mouth during administration to children or persons with limited facial movements.
2Object-affected harmful factors
If a flat end syringe is used, then the administration comfort is improved, but the syringe may penetrate past the adapter and get soiled with drug
Solution Approach 1:
The invention applies the nesting principle by providing a recessed seat within the adapter that receives and houses the flat proximal end of the syringe. This nested structure ensures the syringe is properly positioned and contained within the adapter, preventing penetration past the adapter while maintaining administration comfort and eliminating drug soiling.
3Loss of substance
If the syringe is tightly coupled to the adapter, then drug wastage is prevented, but the disengagement becomes difficult
Solution Approach 1:
The invention applies preliminary action by providing a pre-configured snap-fit engagement mechanism with complementary shapes and snap-fit features that create a tight seal during aspiration. The design allows the components to be easily disengaged after use by simply pulling the syringe away from the adapter, resolving the contradiction between tight coupling for drug wastage prevention and ease of disengagement.
4Loss of substance
If the adapter and syringe are tightly coupled, then drug filtration through gaps is prevented, but the manufacturing precision requirements increase
Solution Approach 1:
The invention applies local quality by providing a recessed seat within the adapter that locally contains the sealing interface. This localized sealing structure ensures tight coupling and prevents drug filtration through gaps while maintaining reasonable manufacturing precision requirements, as the sealing function is concentrated in a specific localized area rather than requiring precision throughout the entire adapter-syringe interface.
Data Source
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AI summary
The invention relates to a dosing syringe (100) comprising a hollow cylindrical body (10) and a plunger (20) sliding within the hollow cylindrical body (10). The hollow cylindrical body comprises a main body (11) and a proximal end (12) provided with an aperture (13). The main body (11) has at least one portion having a cross-section smaller than that of the proximal end (12), whereby a surface (14) is delimited between the main body and the proximal end, which is configured to abut against a corresponding surface of an adapter (30), so that the proximal end is removable and liquid-tight blocked between said surface of the adapter and a bottom wall (37) provided with an aperture (39) of the adapter, the aperture (13) of the proximal end (12) and the aperture (39) of the bottom wall (37) being in direct fluid communication therebetween. The invention also relates to an adapter for use with a dosing syringe as defined above and an administration kit comprising the dosing syringe and the relative adapter.