Injection Data Logger Trigger Switch Mechanism
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Solution Overview
Problem
Existing drug delivery devices lack efficient and user-friendly data logging capabilities, particularly for patients with impaired vision or dexterity, making it difficult to track and monitor the use of injection devices, especially for variable dose settings and dispensing.
Innovation Solution
A data logging device integrated into or adaptable to injection devices, featuring a processor, switch arrangement, and trigger mechanism that detects and records dose settings and dispensing events, with a hysteresis function to prevent premature switching, allowing for easy integration and low-cost production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a data logging device is integrated into the injection device, then monitoring and recording of dose settings and dispensing events is improved, but device complexity increases
Solution Approach 1:
The data logging device is integrated into the injection device by combining the trigger mechanism with the dose button assembly. The trigger is formed as a single piece with the dose button, and the switch arrangement is integrated into the trigger structure, eliminating the need for separate components and reducing overall device complexity while maintaining monitoring functionality.
Solution Approach 2:
The trigger mechanism serves multiple functions: it acts as both the dose dispensing button and the activation switch for the data logging device. The same mechanical component (trigger) that dispenses the dose also activates the switch arrangement to log the event, thereby achieving multi-functionality and reducing device complexity.
2Measurement precision
If a switch arrangement is used to detect trigger position, then measurement precision of dose events is improved, but device complexity increases
Solution Approach 1:
The trigger mechanism automatically activates the switch arrangement through its own mechanical movement. The trigger is designed to directly engage with the switch arrangement, using its自身的 motion to detect and record dose events without requiring external sensors or complex detection systems.
Solution Approach 2:
The patent uses a simple mechanical switch arrangement that detects trigger position through direct mechanical engagement. This mechanical detection system replaces more complex electronic or optical sensing mechanisms, providing sufficient measurement precision while minimizing device complexity.
3Reliability
If hysteresis function is implemented in the trigger mechanism, then reliability of dose event detection is improved, but device complexity increases
Solution Approach 1:
The hysteresis function is built into the trigger mechanism design beforehand, using the geometric configuration of the trigger and switch arrangement to automatically prevent premature switching. The trigger geometry is designed so that it naturally provides hysteresis behavior, eliminating the need for additional control mechanisms or complex electronics.
Data Source
AI summary
The present disclosure relates to a data logging device for monitoring an injection device, the injection device including a housing and a movable part movable between a first end position and a second end position, the data logging device including a trigger connectable to at least one of the movable part and the housing, a switch arrangement including a first switch engaged with the trigger and movable between a first trigger end position and a second trigger end position, the switch arrangement operable to switch between a first switching state and a second switching state upon movement of the trigger, and a processor connected to the switch arrangement and operable to detect a transition of the switch arrangement between the first switching state and the second switching state.