Injection Device Feedback Mechanism for Controlled Mixing
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Solution Overview
Problem
Existing medicament delivery devices face challenges in safely and reliably administering mixed medicament agents, as they often subject these agents to high mixing forces, are prone to degradation, and lack intuitive user interfaces for locking and dose accuracy, especially in emergency situations.
Innovation Solution
An injection device with a feedback mechanism that includes a housing, plunger rod, button, tubular flexible locking device, drive force device, and guide rod, providing audible and tactile feedback upon automatic injection initiation and completion, ensuring controlled mixing and injection forces while preventing premature activation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If automatic mixing is performed using springs and mechanical means, then the mixing process is facilitated and dosage is controlled, but the mixing force is too high at the beginning causing medicament degradation
Solution Approach 1:
The device performs preliminary actions in a specific sequence: first mixing the medicament components, then penetrating the needle, and finally administering the injection. This staged approach allows the mixing to occur before the high-force injection phase, preventing degradation during the mixing phase while still enabling controlled delivery.
Solution Approach 2:
The device uses a dynamic mechanism where the plunger rod and stopper interact to control the mixing process. The stopper can be manually depressed to initiate mixing, and the system transitions from a mixed state to an injection state, allowing adaptive control of the mixing force based on user action rather than constant high force.
2Reliability
If manual mixing is performed by depressing stoppers, then the medicament can be prepared for delivery, but the procedure is awkward and difficult for users not trained in handling these devices
Solution Approach 1:
The device is designed to perform the mixing function automatically or with minimal user intervention. The mechanical structure allows the mixing to occur through the natural operation of the device components, reducing the need for users to manually manipulate stoppers and understand complex procedures.
Solution Approach 2:
The mixing action is prepared and enabled in advance through the device structure, where the stoppers and chambers are positioned to allow easy mixing when activated. This preliminary preparation makes the actual mixing step simple for the user while ensuring reliable medicament preparation.
3Measurement precision
If the device provides automatic injection functionality, then dosage accuracy is improved, but the device complexity increases with additional components and mechanisms
Solution Approach 1:
The device combines multiple functions into a single integrated system: the plunger rod serves both as a mixing mechanism and an injection mechanism, the stopper serves both to seal chambers during mixing and to control delivery during injection. This multi-functionality reduces the need for separate components while maintaining dosage accuracy.
Solution Approach 2:
The device merges the mixing and injection processes into a single operational sequence using shared components. The plunger rod and stopper system performs both mixing and injection functions, reducing overall device complexity while ensuring accurate dosage delivery through the integrated mechanism.
4Reliability
If the device uses electronic control for mixing and injection, then precision and reliability are improved, but the device becomes sensitive to noise, moisture, and battery dependency
Solution Approach 1:
The device replaces electronic control systems with a purely mechanical control mechanism. The plunger rod, stopper, and spring system provide precise control through mechanical interactions rather than electronic signals, eliminating sensitivity to noise, moisture, and battery dependency while maintaining control precision.
Solution Approach 2:
The mechanical system is self-regulating and does not require external power sources or electronic control. The spring-loaded mechanism and mechanical linkages automatically control the mixing and injection processes based on physical principles, making the device independent of batteries and immune to environmental electromagnetic interference.
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 device ensures safe and reliable automatic injection with controlled mixing forces, preventing medicament degradation and improving user interface simplicity, reducing the risk of malfunctions and ensuring accurate dosing.
Implementation Method 1
a drive force device pre-tensioned arranged between a distal portion of the activation member and the proximal end of the plunger rod
Data Source
AI summary
An injection device with a feedback mechanism includes a housing for a medicament container having a stopper, a plunger rod for acting on the stopper, a button interactively connected to the plunger rod, an activation member having a flexible locking device releasably connected to the plunger rod, a drive force device, a locking member slidable between positions in which the locking member either completely or partially surrounds the flexible locking device, and a guide rod. Audible and tactile information that an injection has started is provided by the plunger rod's hitting the stopper.