Variable Latching Injection Device for Precise Dosing
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Solution Overview
Problem
Existing injection devices have fixed dosing increments, requiring users to overcome multiple latching steps and resulting in significant fluid wastage during the priming procedure, with no audible feedback when dispensing, making it difficult to set precise dosages like 0.20 ml or 0.25 ml.
Innovation Solution
An injection device with a latching unit that allows for variable spacing of latching positions, where each position is assigned a unique rotational position of the setting part relative to the housing, enabling precise control and minimizing the force required for dispensing, and allowing for skipping of latching positions with adjustable torque.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If fixed dosing increments are used, then the device structure is simple, but the dosing precision is insufficient and fluid wastage increases
Solution Approach 1:
The latching unit is designed with variable spacing between latching positions rather than fixed uniform spacing. This allows the device to adapt to different dosing requirements, providing finer resolution when small dosages are needed while maintaining simplicity for larger dosages. The dynamic configuration of latching positions enables precise control over dosing increments without requiring a completely complex device structure.
Solution Approach 2:
The spacing between consecutive latching positions is varied as a parameter. Some intervals between latching positions are smaller than others, allowing for different levels of dosing precision in different ranges. This parameter change approach enables the device to achieve high dosing precision for small volumes while avoiding excessive complexity throughout the entire dosing range.
2Loss of substance
If smaller dosing increments are used, then fluid wastage during priming is reduced, but the number of latching positions increases significantly
Solution Approach 1:
The latching unit employs variable spacing where smaller intervals are strategically placed in the dosing range where precision is most needed (small dosages), while larger intervals are used for larger dosages. This dynamic spacing reduces the total number of latching positions compared to a uniform fine-grained system, thereby reducing fluid wastage during priming while maintaining the ability to set small dosages precisely.
3Measurement precision
If multiple latching steps are required, then dosing precision can be achieved, but the ease of operation is reduced
Solution Approach 1:
The variable spacing of latching positions allows for larger intervals in certain ranges, reducing the number of latching steps the user must overcome when setting dosages in those ranges. This makes the device easier to operate for common dosing scenarios while still providing fine precision when needed, balancing dosing precision with ease of operation.
Data Source
AI summary
An injection device includes a housing and a setting part configured to, in relation to said housing, rotate in a first rotational direction when an amount of injection fluid to be dispensed is being set. The setting part rotates in a second rotational direction counter to the first rotational direction when the injection fluid is pressed out of the injection device. A latching unit defines at least one latching position of the setting part and acts between the setting part and the housing. The latching unit is active at least when the amount of injection fluid to be dispensed is set and each of the latching positions has an unequivocal rotational position of the setting part in relation to the housing assigned thereto.