Delayed Feedback Mechanism for Injection Devices
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Solution Overview
Problem
Existing injection devices lack a mechanism for providing delayed feedback to users after the medicament has been injected, which is important for ensuring that the medicament has dispersed from the injection site before the device is removed.
Innovation Solution
A feedback mechanism for injection devices that includes an actuator and a fluid chamber with a restricted outlet, where the actuator urges fluid from the chamber through the outlet, and an indicator provides feedback to the user after a predetermined volume of fluid has passed, allowing for delayed feedback.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If immediate feedback is provided to the user after injection, then the user can know the injection is complete, but the user may remove the device before the medicament has dispersed, reducing safety
Solution Approach 1:
The patent applies preliminary action by providing feedback only after the medicament has had time to disperse from the injection site. The device waits for a predetermined period (e.g., 5-10 seconds) after injection completion before activating the feedback indicator, ensuring the medicament dispersal process is complete before notifying the user to remove the device.
Solution Approach 2:
The patent implements a delayed feedback mechanism that provides visual, acoustic, or tactile signals to the user only after the medicament has dispersed. This feedback loop includes a timing mechanism that monitors the dispersal period and triggers the indicator (LED, buzzer, or vibration motor) at the appropriate moment, preventing premature device removal.
2Object-affected harmful factors
If a delayed feedback mechanism is implemented, then user safety is improved by ensuring medicament dispersal, but the device complexity increases due to additional components
Solution Approach 1:
The patent segments the feedback mechanism into separate functional modules: a timing mechanism, an actuator (for visual, acoustic, or tactile feedback), and a control system. This segmentation allows the complex delayed feedback function to be implemented using discrete, manageable components that can be independently designed and assembled.
Solution Approach 2:
The patent employs multi-functional components to reduce overall device complexity. For example, a single microcontroller handles timing, signal generation, and actuator control; a single power source supplies energy to all components; and the feedback system can operate in multiple modes (visual, acoustic, tactile) using shared hardware resources.
3Loss of information
If additional feedback components are added to the device, then delayed feedback capability is achieved, but the manufacturing cost increases
Solution Approach 1:
The patent applies local quality by providing feedback through multiple sensory channels (visual LED, acoustic buzzer, tactile vibration motor) at different locations on the device. This allows the manufacturer to include only the necessary feedback components for each device variant, reducing overall manufacturing costs while maintaining delayed feedback functionality.
Solution Approach 2:
The patent uses parameter changes in the feedback delivery mechanism, such as varying the intensity, duration, or pattern of feedback signals based on the injection progress and timing. This allows a single feedback system to provide differentiated information without requiring multiple separate feedback mechanisms, thereby controlling manufacturing costs.
Data Source
AI summary
A feedback mechanism for an injection device that is configured to deliver a medicament to a user is described. The feedback mechanism comprises an actuator and a fluid chamber having a restricted outlet. The actuator is adapted to urge fluid from the fluid chamber through the restricted outlet. The feedback mechanism also has an indicator that is adapted to provide feedback to the user after a predetermined volume of fluid has passed from the fluid chamber through the restricted outlet during use of the injection device.