Medicine Administration Device with Grip Section for High Back Pressure
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Solution Overview
Problem
Existing drug administration devices face challenges when administering drugs to the skin's upper section due to high back pressure, leading to needle dislodgment and drug leakage, and are complicated in design with increased parts for high-pressure injection.
Innovation Solution
A drug administration device with a tubular section, a pusher section, and a grip section that allows for strong force application to prevent needle dislodgment, featuring a gasket and plunger system with a connection section for stable operation, reducing complexity and preventing drug leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If a drug is administered to the skin upper section using an ordinary syringe, then the injection pressure increases to overcome high back pressure, but the needle comes off from the skin and the drug leaks
Solution Approach 1:
The pressing section is designed to apply pressing force to the skin in advance before and during the injection process. This preliminary action counteracts the high back pressure that would otherwise cause needle dislodgment, allowing the needle to remain securely in place while enabling drug delivery to the skin upper section.
2Stress or pressure
If a pressure syringe with release button and compression spring is used to generate high pressure, then the injection pressure increases, but the number of parts increases and the constitution becomes complicated
Solution Approach 1:
The invention merges the pressing function and injection function into a single integrated structure. The pressing section is formed as an integral part of the syringe body, eliminating the need for separate components like release buttons and compression springs. This integration maintains the capability to generate high injection pressure while significantly simplifying the overall device structure.
Solution Approach 2:
The pressing section is designed to be directly operable by the user's finger without requiring separate control mechanisms. The structure allows the user to apply pressing force directly to the skin through the pressing section, which automatically translates this force into the necessary injection pressure, eliminating the need for complex mechanical advantage systems.
3Quantity of substance
If a small-sized syringe is used to administer small amount of drug (about 100 μL), then the drug amount is appropriate, but the syringe cannot strongly press against the skin to prevent drug leakage
Solution Approach 1:
The syringe is segmented into distinct functional sections: the tubular section for holding the drug, the pressing section for applying force to the skin, and the connection section for linking these functions. This segmentation allows the pressing section to be optimized for force application while the tubular section maintains appropriate size for small drug volumes, resolving the conflict between size and pressing capability.
Data Source
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AI summary
A needle does not come off even if a high back pressure occurs at the skin upper section. Thus, the drug leakage from the skin can be prevented. A drug administration device 1 includes a tubular section 2 having a fluid chamber 7 capable of accommodating a drug and a discharge section 22, a pusher member 3 moving within the tubular section 2, a grip section 4, and a connection section 5. The pusher member 3 includes a rod-shape plunger 31 and a gasket 32. The grip section 4 is disposed along the outer periphery of the tubular section 2 and kept away from the tubular section 2, and the connection section 5 is formed between the tubular section 2 and the grip section 4.