Peripheral Dose Indicator for Injection Device Grip Clearance
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Solution Overview
Problem
Existing injection devices face challenges in providing an efficient and accurate dose indication mechanism that does not interfere with the user's grip, as conventional dose indicators often occupy central space and are passively operated in parallel to the spring charging process.
Innovation Solution
An injection device design featuring an odometer dose indicator coupled with a spring, where the dose selector is operatively connectable to the dose indicator, allowing for dual functionality of displaying the selected dose and transferring charging force to the spring, ensuring accurate dose indication and energy storage for medicament delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If a number sleeve is used as a dose indicator, then the dose can be displayed, but the indicator area occupies a large portion of the device and is centrally located, interfering with the user's grip
Solution Approach 1:
The patent relocates the dose indicator from a central axial position to a peripheral position on the device housing. This spatial reconfiguration moves the indicator away from the user's gripping hand, eliminating the obstruction problem while maintaining dose visibility through a window in the housing.
Solution Approach 2:
The dose indicator is extracted from the central operational area and repositioned to a peripheral location. This separation removes the indicator from the user's grip zone, allowing clear viewing without finger obstruction while preserving the dose display function.
2Loss of information
If a number sleeve is used for dose indication, then the dose can be displayed, but the indicator operates passively in parallel to the spring charging process
Solution Approach 1:
The patent merges the dose indication function with the spring charging mechanism by coupling the dose selector to the dose indicator. This integration ensures that rotating the dose selector to charge the spring simultaneously updates the dose display, eliminating passive parallel operation and improving charging efficiency through active feedback.
Solution Approach 2:
The dose indicator provides real-time feedback on the charging state of the spring through visual display. As the dose selector is rotated to charge the spring, the indicator actively reflects the current dose setting, creating a feedback loop that enhances user awareness and charging efficiency.
3Illumination intensity
If the dose indicator is positioned centrally, then it is easily visible, but it interferes with the user's finger position during grip
Solution Approach 1:
The patent repositions the dose indicator from a central axial location to a peripheral position on the device housing. This spatial relocation moves the indicator away from the user's gripping hand, eliminating finger obstruction while maintaining visibility through a strategically positioned window.
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 design enhances dose accuracy and visibility by actively reflecting the spring's charging state during both dose setting and delivery, providing a more efficient and user-friendly interface without interfering with the user's grip.
Implementation Method 1
a spring capable of storing energy necessary for ejecting the dose from the injection device; wherein the spring is locked at one end to the dose indicator such that a charging force can be transferred from the dose selector to the spring via the dose indicator, when the dose selector is operatively connected to the dose indicator, to increase the energy stored by the spring
Implementation Method 2
an injection device having a torsion spring for assisting injection of a dose of medicament from an injection device
Data Source
AI summary
An injection device comprising a housing (112), and a dose selector (116) operatively connectable to a dose indicator positioned within the housing. The dose selector and the dose indicator (118, 119) are capable of cooperating to set a dose to be ejected from the injection device. The injection device further comprises a spring (120) capable of storing energy necessary for ejecting the dose from the injection device. The spring is locked to the dose indicator such that a charging force can be transferred from the dose selector to the spring via the dose indicator to increase the energy stored by the spring.