Dose Selector Clutch Decoupling for Accurate Delivery
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Solution Overview
Problem
Existing dose delivery devices face issues with incorrect dose delivery due to accidental rotation of the dose dial, and user discomfort during the dose delivery process.
Innovation Solution
A rotatable dose selector clutch mechanism that allows for simultaneous coupling and decoupling of a dosage scale drum and a thrust bearing, preventing incorrect dose delivery and improving user comfort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a helical track coupling mechanism is used between the dose setting member and dose dial, then the dose can be set and delivered, but the dose dial can be accidentally rotated backwards when pressure is applied to the push-button, causing incorrect dose display
Solution Approach 1:
The coupling mechanism is divided into two independent sets of coupling means: outer coupling means (first set) connecting the dose dial to the dose selector, and inner coupling means (second set) connecting the thrust bearing to the dose selector. This segmentation allows independent control and decoupling of each connection, preventing accidental rotation of the dose dial during dose delivery while maintaining reliable dose setting functionality.
2Productivity
If a helical track coupling mechanism is used, then dose setting and delivery is enabled, but the dose setting member rotates slowly during dose delivery, causing user discomfort
Solution Approach 1:
The segmented coupling mechanism allows the inner coupling means to be decoupled independently during dose delivery. This enables the dose setting member to rotate freely without the constraint of the helical track, significantly improving rotation speed and user comfort during the dose delivery process while maintaining the gearing mechanism's functionality when needed.
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 mechanism ensures accurate dose delivery by preventing accidental resetting of the dose and allows for independent rotation of driver parts during dosing, enhancing user experience and comfort.
Implementation Method 1
the thrust bearing is configured to be threaded coupled to a piston rod
Data Source
AI summary
A rotatable dose selector clutch for a dose delivery device is disclosed. The dose delivery device having a dosage scale drum with interior dosage scale coupling means and a thrust bearing with exterior thrust bearing coupling means, the thrust bearing is configured to be threaded coupled to a piston rod, wherein the dose selector clutch is configured to be arranged in: •a coupled position, wherein the dose selector clutch couples to the dosage scale drum and the thrust bearing, such that the dosage scale drum and the thrust bearing rotates when the dose selector clutch is rotated, and •a decoupled position, wherein the dose selector clutch decouples from the dosage scale drum and the thrust bearing, such that the dosage scale drum and the thrust bearing are free to rotate independently of the dose selector clutch.