Deformable Medical Injection Stopper for High-Viscosity Flow
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Solution Overview
Problem
Existing medical injection devices face challenges in easily injecting high-viscosity compositions, causing user strain and repetitive injuries, and suffer from mixing of contents due to inadequate sealing and dead volume issues, leading to inaccuracies and waste.
Innovation Solution
A stopper design featuring a gasket and insert that transitions between closed and open configurations, ensuring optimal sealing and minimizing dead volume, allowing easy injection of multiple compositions by deforming under pressure to create a fluid pathway.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the opening in the mobile diaphragm has a small diameter to prevent mixing of two solutions, then the sealing of the first chamber is improved, but the injection of the second solution becomes difficult due to increased force requirements
Solution Approach 1:
The stopper is designed to transition between a closed configuration (preventing mixing) and an open configuration (facilitating injection). The flexible membrane allows the stopper to dynamically change its state based on pressure conditions, resolving the contradiction between maintaining seal integrity and enabling easy injection of the second solution.
Solution Approach 2:
The invention changes the physical state of the stopper from rigid to flexible by incorporating a membrane that can deform under pressure. This parameter change allows the stopper to adapt its opening size dynamically, providing both effective sealing when needed and easy passage for the second solution when injection is required.
2Reliability
If the opening diameter is reduced to prevent solution mixing, then chamber sealing is improved, but user effort increases causing strain and repetitive injuries
Solution Approach 1:
The flexible membrane enables the stopper to dynamically respond to pressure changes, transitioning from a sealed state to an open state during injection. This dynamic behavior reduces the force required from the user compared to a rigid stopper with a small fixed opening.
Solution Approach 2:
The membrane acts as a flexible element that can deform under pressure to create a fluid pathway. This flexibility allows the stopper to maintain effective sealing when closed while requiring minimal user force to open and allow solution passage.
3Strength
If a plug with flanges is used to separate chambers, then structural support is improved, but sealing adequacy deteriorates allowing solution mixing
Solution Approach 1:
The membrane provides a flexible sealing surface that can conform to pressure changes and maintain effective sealing between chambers. Unlike rigid flanges, the membrane adapts to pressure differentials, ensuring reliable prevention of solution mixing while maintaining structural integrity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Facilitates easy injection of high-viscosity compositions with reduced user effort, prevents mixing until the first composition is fully injected, and minimizes dead volume, enhancing precision and reducing waste.
Implementation Method 1
the stopper is adapted to deform between: a closed configuration wherein the gasket cooperates with the insert to hermetically close the through hole
Implementation Method 2
the stopper comprises: a gasket comprising a proximal end, a distal end, a lateral wall, and a through hole extending from the proximal end to the distal end
Data Source
AI summary
The present disclosure relates to a stopper configured to be positioned inside a barrel of an injection device for injecting at least one composition, said stopper including:a gasket including a proximal end, a distal end, a lateral wall, and a through hole extending from the proximal end to the distal end,an insert inserted in the through hole,wherein the stopper is adapted to deform between:a closed configuration wherein the gasket cooperates with the insert to hermetically close the through hole, for preventing flow of the composition between the proximal end and the distal end of the gasket, andan open configuration wherein the gasket cooperates with the insert to open a fluidic pathway in the through hole between the proximal end and the distal end of the gasket for allowing flow of the composition.