Injection Device Radial Clicker Arm Feedback
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Solution Overview
Problem
Existing drug delivery devices often provide unclear or confusing feedback to users, especially during dose dispensing, and may not be compact in design, leading to difficulties for visually impaired users and potential inaccuracies in dose administration.
Innovation Solution
A handheld injection device with a dose indicator and gauge element that provides tactile and audible feedback only during dispensing, featuring a flexible clicker arm that displaces radially during dose delivery and returns to indicate the end of the dose, while maintaining a compact design by keeping components within the housing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If feedback mechanisms are provided during dose setting, then user guidance is improved, but confusion arises during dose correction
Solution Approach 1:
The feedback mechanism is made dynamic by conditioning its activation on the drive member's axial position. The flexible clicker arm is only activated during dose dispensing when the drive member is in the distal position, while during dose setting (proximal position) the feedback is suppressed. This dynamic behavior resolves the contradiction by providing guidance when needed (during dispensing) while preventing confusion during correction.
Solution Approach 2:
The feedback mechanism applies different qualities to different operational phases. During dose dispensing, the flexible clicker arm provides audible/tactile feedback through engagement with the gauge element. During dose setting, the same mechanism remains inactive. This local differentiation of feedback quality based on operational context resolves the contradiction between providing guidance and avoiding confusion.
2Ease of operation
If components are extended outside housing for feedback indication, then feedback visibility is improved, but device compactness deteriorates
Solution Approach 1:
The flexible clicker arm and gauge element are nested within the housing boundaries. The clicker arm is positioned radially inward and engages with the gauge element in a compact arrangement that fits within the housing volume. This nesting approach provides feedback functionality without extending components outside the housing, resolving the contradiction between feedback visibility and device compactness.
Solution Approach 2:
Instead of extending feedback components in the axial dimension (outside housing), the invention uses radial displacement of the flexible clicker arm to provide feedback. The clicker arm deflects radially inward to engage the gauge element, creating feedback in the radial dimension while maintaining axial compactness within the housing. This dimensional shift resolves the contradiction.
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 accurate and intuitive dose administration with clear feedback, preventing confusion during dose correction and maintaining a compact form factor, enhancing usability for both visually impaired and general users.
Implementation Method 1
a flexible clicker arm which, only during dispense, is displaced by the drive member in a first radial direction and, when the device reaches its minimum dose (zero) position, in a second, opposite radial direction by the gauge element
Data Source
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Figure 3~4b
Figure 5~7b
AI summary
The invention refers to a handheld injection device comprising a housing (10; 410)and a dose indicator (90; 480) positioned within and axially constrained to the housing (10; 410) and rotatable with respect to the housing (10; 410) during dose setting and during dose dispensing. The dose indicator (90; 480) may comprise a flexible clicker arm (95; 482) which, only during dispense, is displaced in a first radial direction and, when the device reaches its minimum dose (zero) position, in a second, opposite radial direction.