Syringe Slider-Button Mechanism for Air Removal and Needle Stability
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Solution Overview
Problem
Conventional injection devices require frequent switching of the area to be held during operations such as air removal and injection, which can cause discomfort and potential damage to the injection site due to needle movement.
Innovation Solution
An injection device with a syringe, conversion portion, button, and slider mechanism that allows air removal and injection without frequent area switching by using a button with inclined leg portions and engaging slopes, supported by a slider that moves the conversion portion and button in a single direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the user operates the plunger to remove air and then holds the plunger for injection, then the injection operations can be completed, but the user has to frequently switch the held area from the syringe tip to the plunger, which makes the operations troublesome
Solution Approach 1:
The patent combines the plunger operation and syringe holding into a single integrated operation. The push rod transmits force from the plunger to the gasket, allowing the user to hold only the syringe body while the plunger automatically pushes the gasket forward for both air removal and injection, eliminating the need to switch between holding different parts.
Solution Approach 2:
The push rod acts as an intermediary mechanism that connects the plunger to the gasket. It transmits the pushing force from the plunger through the syringe body to the gasket, enabling automatic gasket advancement without requiring the user to directly manipulate both the plunger and syringe tip separately.
2Ease of operation
If the user holds the plunger after sticking the needle, then the injection can proceed, but the needle tip may be shaken, which may damage skin cells or tissue and cause pain
Solution Approach 1:
The patent extracts the plunger holding requirement from the injection operation. By using the push rod to transmit force automatically, the user only needs to hold the syringe body, not the plunger. This removes the source of instability (plunger manipulation) while maintaining the injection function.
Solution Approach 2:
The push rod is pre-configured to transmit force from the plunger to the gasket automatically. This preliminary mechanical arrangement ensures that when the user pushes the plunger, the gasket moves forward without requiring the user to simultaneously stabilize the needle tip, preventing shaking before it occurs.
3Adaptability or versatility
If conventional injection devices are used, then injection functions are provided, but frequent switching of the held area increases operational complexity and user burden
Solution Approach 1:
The push rod mechanism serves multiple functions: it transmits force during air removal, maintains gasket position during needle insertion, and enables injection by pushing the gasket forward. This single mechanism handles all injection-related movements, simplifying the overall operation despite maintaining full injection functionality.
Data Source
AI summary
An injection device includes a syringe including a body having an opening, a conversion portion, a button, and a slider. The button includes a pair of leg portions disposed so as to straddle the conversion portion and having front slopes inclined with respect to a tip direction by a set angle. The conversion portion includes a pair of engaging portions connected to a rear end portion of a gasket and having rear slopes that slidingly contact the front slopes of the leg portions. The slider moves the conversion portion and button in the tip direction. The conversion portion moves in the tip direction along with the gasket in accordance with an operation of pushing down the button toward the inside of the body. An injection unit includes the injection device and one or more adjustment members configured to adjust the frontmost position of the button in the opening.