Injector Spindle Dial Mechanism for Injection Progress Feedback
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Solution Overview
Problem
Current injector devices lack an effective mechanism to provide clear and intuitive feedback to users about the progress of the injection process, which can lead to user uncertainty and potential errors during medicament administration.
Innovation Solution
The injector device incorporates a spindle with a dial and a threaded arrangement that rotates as the plunger rod moves, providing visual feedback through a display window, allowing users to track the injection progress and receive tactile feedback, ensuring accurate administration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If no indicator mechanism is provided in the injector device, then the device structure remains simple, but users lack clear feedback on injection progress leading to uncertainty and potential errors
Solution Approach 1:
The patent implements a feedback mechanism through a dial indicator that rotates in response to plunger rod movement. The dial provides continuous visual feedback to users about the injection progress, transforming the invisible internal plunger movement into visible rotational movement that users can monitor throughout the injection process.
Solution Approach 2:
The spindle acts as an intermediary mechanism that translates the linear movement of the plunger rod into rotational movement of the dial. This intermediary converts the direct connection between plunger and needle into an indirect measurement system, allowing users to track progress without directly observing the plunger's position.
2Measurement precision
If a threaded arrangement is used to convert linear plunger rod movement to rotational dial movement, then continuous visual feedback is provided, but the mechanism becomes more complex
Solution Approach 1:
The patent replaces complex electronic or optical measurement systems with a simple mechanical threaded arrangement. The thread converts linear displacement into rotational movement through pure mechanical means, providing precise measurement of injection progress without requiring sensors, batteries, or electronic components.
Solution Approach 2:
The threaded arrangement changes the parameter of motion from linear (plunger rod movement) to rotational (dial movement). This parameter transformation allows the injection progress to be displayed in a more intuitive circular format while maintaining precise measurement through the thread's pitch relationship.
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
This solution enhances user confidence by providing clear, continuous, and intuitive feedback on the injection process, ensuring accurate and efficient medicament delivery.
Implementation Method 1
the shaft of the spindle comprises a threaded arrangement configured to engage with a threaded arrangement on the plunger rod such that longitudinal movement of the plunger rod from the primed position towards the completed position is configured to cause the dial of the spindle to rotate
Data Source
AI summary
An injector device comprising an elongate housing having a proximal end and a distal end, and configured to receive a container of medicament, a plunger rod moveable longitudinally within the housing between a primed position and a completed position, the plunger rod being configured to engage a container of medicament when received in the housing; wherein the housing comprises an indicator located in a proximal region of the housing; the indicator comprising a spindle, the spindle comprising a shaft and a dial, and wherein the shaft of the spindle comprises a threaded arrangement configured to engage with a threaded arrangement on the plunger rod such that longitudinal movement of the plunger rod from the primed position towards the completed position is configured to cause the dial of the spindle to rotate to provide a user with information associated with the progress of the injection process dependent upon the longitudinal position of the plunger rod.