Two-Chamber Syringe Structure for Stable Mixing and Leak Control
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Solution Overview
Problem
Conventional two-chamber type combined container-syringes experience issues with medicinal fluid leakage and inefficient mixing due to high kinetic energy during plunger movement, leading to contamination and improper drug preparation.
Innovation Solution
A two-chamber type combined container-syringe design with specific chamber ratios, support ribs on the plunger rod, and enhanced stopper seals to stabilize the plunger and improve mixing efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the plunger is pushed rapidly to improve productivity, then the medicinal fluid exits the bypass groove portion rapidly, but the medicinal fluid leaks through gaps or grooves and flows backward, causing contamination and insufficient mixing
Solution Approach 1:
The patent applies preliminary anti-action by designing the bypass groove portion with specific geometric features (rounded corners, controlled depth) that preemptively prevent fluid leakage and backward flow before rapid plunger movement occurs. The groove is positioned and dimensioned to maintain sealability even under high-speed operation conditions.
Solution Approach 2:
The patent changes physical parameters of the bypass groove portion, specifically controlling its depth, width, and rounded corner radius. These parameter modifications optimize the flow characteristics to prevent leakage while maintaining rapid mixing capability during plunger operation.
2Productivity
If the plunger rod is made stable to prevent shaking, then mixing efficiency improves, but the device complexity increases due to additional support structures
Solution Approach 1:
The plunger rod is segmented into multiple functional portions: a shaft portion for insertion, a hub portion for rotation, and support ribs for stability. Each segment performs a specific function, with the support ribs providing structural reinforcement to prevent shaking during operation.
Solution Approach 2:
The hub portion of the plunger rod is designed with a curved or rounded geometry that facilitates smooth rotation and reduces stress concentration. This curved design improves mixing efficiency while maintaining structural integrity without requiring additional complex support elements.
3Productivity
If the chamber volume ratio is optimized to improve mixing, then the manufacturing precision requirements increase
Solution Approach 1:
The first and second chambers are designed with predetermined volume ratios during the molding process. The chamber dimensions are pre-calculated to achieve optimal mixing conditions, eliminating the need for post-manufacturing adjustment while maintaining precise volume relationships.
Solution Approach 2:
The patent optimizes the volume ratio parameter between the first chamber (medicinal agent) and second chamber (medicinal fluid) to enhance mixing efficiency. Specific dimensional parameters of the chambers are controlled to maintain the optimal ratio while accommodating manufacturing tolerances.
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
The design ensures effective mixing of medicinal agent and fluid, reduces leakage, and enhances user convenience by stabilizing the plunger rod, ensuring accurate drug preparation.
Implementation Method 1
a plunger rod connected to the third stopper, and having a plurality of support ribs provided to come in contact with an inner surface of the finger grip
Implementation Method 2
a plunger rod connected to the third stopper and having a plurality of support ribs provided to come in contact with an inner surface of the finger grip
Data Source
AI summary
The present invention provides a two-chamber type combined container-syringe including: a cylinder having a first end portion, a second end portion in an opposite direction of the first end portion, and a bypass portion disposed between the first end portion and the second end portion; a finger grip mounted on the second end portion of the cylinder; a first stopper, a second stopper, and a third stopper that are sequentially disposed from the first end portion toward the second end portion in a space of the cylinder; and a plunger rod that is connected to the third stopper and has a plurality of support ribs provided to come in contact with an inner surface of the finger grip, wherein a space between the first stopper and the second stopper forms a front chamber, a space between the second stopper and the third stopper forms a rear chamber, a first ingredient and a second ingredient are accommodated in the front chamber and the rear chamber, respectively, a length ratio of the front chamber and the rear chamber is in a range of 1.6:1 to 3:1 when the plunger rod is at an initial position which is a state before the front chamber and the rear chamber communicate with each other through the bypass portion, and at the initial position, one or more support ribs are disposed in at least one of the finger grip and a region in the cylinder that is adjacent to the finger grip.