Injection Device Trigger Damping for Accidental Activation Prevention
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Solution Overview
Problem
Existing injection devices can be unintentionally activated by sudden impact forces, such as dropping, leading to accidental discharge and unclear usage status due to loose triggers that can return to their starting position.
Innovation Solution
Incorporation of a damping means, specifically a viscous non-Newtonian fluid, between the trigger and the housing to absorb impact energy, prevent accidental activation, and retain the trigger in its active position, indicating usage, while reducing noise and preventing self-activation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the trigger is made loose and free to move for easy operation, then ease of operation is improved, but reliability deteriorates because the trigger can return to its starting position making it unclear whether the device has been used
Solution Approach 1:
A damping means is introduced as an intermediary element between the trigger and the drive mechanism. This damping means provides resistance to trigger movement, preventing the trigger from returning to its starting position after actuation, while still allowing intentional user operation. The damping means thus mediates between the need for easy operation and the need for reliable usage status indication.
2Ease of operation
If the trigger is made loose and free to move for easy operation, then ease of operation is improved, but reliability deteriorates because the trigger can be unintentionally activated by sudden impact forces
Solution Approach 1:
The damping means acts as a cushioning element that is already in place before impact occurs. When sudden impact forces are applied to the device, the damping means absorbs and dissipates the impact energy, preventing the trigger from being unintentionally activated. This beforehand cushioning allows the trigger to remain relatively loose for easy operation while protecting against accidental activation.
3Ease of operation
If the trigger is made loose and free to move for easy operation, then ease of operation is improved, but harmful factors increase due to noise when the trigger is operated
Solution Approach 1:
The damping means serves as a pre-positioned cushioning element that absorbs the mechanical energy of trigger operation. As the trigger moves from its rest position to its active position, the damping means dissipates the energy through viscous resistance, significantly reducing the noise generated by the trigger mechanism. This allows the trigger to remain loose for easy operation while minimizing noise pollution.
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 damping means effectively prevents accidental discharge and clearly indicates usage status, enhancing the reliability and safety of the injection device by absorbing impact forces and maintaining the trigger in its active position, thus reducing noise and potential damage.
Implementation Method 1
A problem with an injection device of this type is that the trigger may be unintentionally activated by a sudden impact force, for example that associated with the injection device being dropped and striking the ground.
Implementation Method 2
The damping means is be a viscous fluid. Preferably, the viscous fluid is a non-Newtonian fluid.
Data Source
Figure 1~2
Figure 3~4
Figure 5
AI summary
An injection device (110) is provided that includes a housing (1 12) and a drive (121) that acts upon a syringe (122) when released by a trigger (1 14). The trigger (114) is rotatable from a rest position, in which it causes the drive (121) to be retained, to an active position, in which it no longer causes the drive (121) to be retained. A damping means (132) is arranged in conjunction with the trigger (114) to prevent accidental actuation of the device (110). Such an injection device (110) provides improved reliability and resilience to damage caused by impact forces, for example, when the device (110) is dropped onto a hard surface. The trigger (114) is also retained in its active position after actuation, indicating that the device (110) has been used. Additionally, the noise production by the operation of the trigger (114), which may be distressing to a user, is reduced.