Direct Coupling Dose Setting Mechanism for Injection Devices
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Solution Overview
Problem
Existing dose setting devices for injection devices lack efficient mechanisms for directly transmitting rotational movements to drive elements, resulting in complex and force-intensive operations for setting and dispensing doses.
Innovation Solution
A dosing device mechanism that includes an actuating element, a thrust element, and a coupling system allowing direct transmission of rotational movements from the actuating element to the thrust element, enabling efficient dose setting and dispensing with reduced user force and increased precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a traditional dose setting mechanism is used without direct coupling, then the structure is simpler to manufacture, but the operation requires more user force and is less efficient
Solution Approach 1:
The patent combines the actuating element and thrust element into a directly coupled system where the actuating element's rotational movement is directly transmitted to the thrust element. This merging eliminates intermediate transmission components, reducing the force required during operation while maintaining structural efficiency.
Solution Approach 2:
The patent introduces a coupling mechanism as an intermediary component that efficiently transmits rotational movement from the actuating element to the thrust element. This mediator enables direct force transmission without requiring complex gear systems or multiple transmission stages, thereby reducing operational force requirements.
2Measurement precision
If direct transmission of rotational movement is implemented, then dose setting precision is improved, but the mechanism becomes more complex
Solution Approach 1:
By directly coupling the actuating element with the thrust element, the patent eliminates intermediate transmission components that could introduce play or imprecision. This direct merging ensures that rotational movements are accurately and directly translated into dosing actions, improving precision without requiring complex adjustment mechanisms.
3Adaptability or versatility
If axial movement of the actuating element is greater than the thrust element, then the dosing range is expanded, but the mechanical efficiency is reduced
Solution Approach 1:
The patent employs a dynamic coupling mechanism that allows for variable transmission ratios between the actuating element and thrust element. This dynamic adjustment enables the system to expand the dosing range by varying the axial movement relationship while maintaining high mechanical efficiency through optimized force transmission at each operating point.
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 solution enables high-force operation with reduced user effort, allowing for precise dose setting and dispensing, while simplifying the mechanism and enhancing user experience.
Implementation Method 1
a coupling to which the actuating element and the thrust element are coupled such that a rotational movement of the actuating element is transmitted directly to the thrust element
Implementation Method 2
the operating element is in threaded engagement with the dose setting element, housing or insert, and can be moved to set a dose to be dispensed from the injection device
Data Source
AI summary
A dosing device for an injection device, the dosing device including an actuating element for adjusting and/or dispensing a dose from the injection device, a thrust element for generating a forward movement for discharging a dose and a coupling to which the actuating element and the thrust element are coupled such that a rotational movement of the actuating element is transmitted directly to the thrust element and an axial movement of the actuating element is different than an axial movement of the thrust element.