Needleless Injector Dual-Switch Activation for Stable Ejection
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Solution Overview
Problem
Existing needleless injectors face issues with inconsistent operation due to varying reaction forces from the target region, leading to potential instability and safety concerns during ejection of injection substances.
Innovation Solution
A needleless injector design utilizing two switches - a sliding switch and a pressing switch - arranged differently on the housing to ensure stable and safe operation, with a control unit activating the driving part only after sequential and intentional user actions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a standby switch is provided to prevent unintentional activation, then safety is improved, but the operation mechanism becomes more complex and requires two-stage operation
Solution Approach 1:
The patent combines the standby switch and activation switch into a single integrated switch structure. The switch has two positions: a standby position (first position) where the ejection operation is inhibited, and an activation position (second position) where the ejection operation is enabled. This merging eliminates the need for separate switches while maintaining the two-stage safety operation requirement.
Solution Approach 2:
The single switch performs multiple functions: it serves as both the standby switch (by being positioned in the standby position to inhibit ejection) and the activation switch (by being positioned in the activation position to enable ejection). This multi-functionality reduces the overall number of components and simplifies the operation mechanism while preserving safety features.
2Reliability
If the standby switch is pushed in by contact with the target region, then safety is improved, but the operation becomes unstable due to varying reaction forces
Solution Approach 1:
Instead of having the target region contact push the standby switch (which caused instability due to varying reaction forces), the patent inverts the operation: the user actively moves the single switch to the standby position using their finger. This inversion transfers control from passive contact to active user input, ensuring stable and intentional operation.
Solution Approach 2:
The patent introduces a finger as an intermediary between the user and the switch. The user's finger deliberately positions the switch in the standby or activation position, providing a stable and controlled interaction mechanism. This intermediary eliminates the variability caused by direct contact between the target region and the switch.
3Reliability
If two switches are used for two-stage operation, then safety is improved, but the number of components increases
Solution Approach 1:
The patent merges the standby switch and activation switch into a single switch component. The switch has two distinct positions that correspond to the two stages of operation: standby position (first position) and activation position (second position). This merging reduces the component count from two separate switches to one integrated switch while maintaining the two-stage safety operation.
Solution Approach 2:
The single switch is designed to perform both the standby function and the activation function. By positioning the switch in different positions (first position for standby, second position for activation), it fulfills the roles of two separate switches, thereby reducing component complexity while preserving safety requirements.
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 two-stage switch mechanism enhances safety and stability by preventing unintentional activation and ensuring consistent ejection of injection substances, improving user operability and reducing interference from the power cable.
Implementation Method 1
a combustion chamber 20a into which a combustion product is discharged
Implementation Method 2
a piston 40 that is movable in the longitudinal direction of the actuator 20
Data Source
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AI summary
A needleless injector of the present disclosure includes an injector enclosure that has a tubular shape and is configured to be capable of being held by one hand of a user, a first switch and a second switch that is provided to the injector enclosure for activation of a driving part, and a control unit that controls the activation of the driving part in response to a predetermined operation on the first switch and the second switch. The first switch is arranged to be slidable in a predetermined direction different from a contact direction of a palm of the user, in a first region on a side surface that is a part of a surface of the injector enclosure positioned on side of the user, the first region being covered by the palm of the user in a holding state of the user, and the second switch has an upper side surface with at least a part inclined toward the side of the user to be visible from the user in a holding state of the user, and is arranged on an upper side of the injector enclosure to be able to be pressed. With this configuration, improvement in safety and stable operation can both be achieved.