Variable Latching Injection Device for Precise Dosage Control
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Solution Overview
Problem
Existing injection devices have fixed dosage increments, requiring users to overcome multiple latching steps to reach desired dosages and resulting in significant fluid wastage during priming, which is inefficient and cumbersome.
Innovation Solution
An injection device with a setting part that rotates and moves in relation to the housing, allowing for variable latching positions at different spacings, enabling precise control over dosage increments and reducing the number of latching positions needed, thereby simplifying operation and minimizing fluid wastage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If fixed dosage increments are used, then the device structure is simple, but the number of latching positions increases and fluid wastage increases
Solution Approach 1:
The latching positions are made variable rather than fixed. The setting part can be rotated to different angular positions, allowing the spacing between latching positions to be dynamically adjusted. This enables the device to accommodate different dosage requirements without requiring a fixed, dense array of latching positions, thereby reducing fluid wastage while maintaining operational simplicity.
Solution Approach 2:
The spacing between latching positions is changed from a fixed parameter to a variable parameter. By allowing the setting part to rotate to different angular positions, the effective spacing between latching positions can be adjusted according to the specific dosage requirements, optimizing the balance between device simplicity and fluid efficiency.
2Loss of substance
If smaller dosing increments are used, then fluid wastage is reduced, but the number of latching positions increases
Solution Approach 1:
Instead of providing many fixed latching positions for small dosing increments, the invention uses a dynamic system where the setting part can rotate to different angular positions. This allows the same physical structure to provide different effective dosing increments based on the rotational position, reducing the need for multiple fixed latching positions while maintaining the ability to deliver precise small dosages.
3Measurement precision
If multiple latching positions are provided, then dosage precision is improved, but operation becomes more complex
Solution Approach 1:
The invention simplifies operation by making the latching positions dynamic rather than fixed. The setting part rotates to different angular positions to achieve different dosages, and the latching mechanism automatically engages at the desired position. This eliminates the need for users to manually navigate through multiple fixed latching steps, reducing operational complexity while maintaining dosage precision.
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 allows for precise control over dosage increments, simplifies the operation by reducing the number of latching positions, and minimizes fluid wastage during the priming procedure, enhancing user experience and efficiency.
Implementation Method 1
the setting part having a thread of a third threaded connection and being configured to, in relation to the housing, rotate in a first rotation direction about the longitudinal center axis and move in the distal direction by virtue of the third threaded connection when the amount of injection fluid to be dispensed is being set
Implementation Method 2
a latching unit defining at least one latching position of the setting part; the latching unit being configured to act between the setting part and the housing
Data Source
AI summary
An injection device includes a housing; a receptacle for injection fluid; a dosing piston to press out the injection fluid; a feed part connected to the dosing piston via a first threaded connection; a slide having a thread of a second threaded connection; and, a setting part having a thread of a third threaded connection and configured to set an amount of injection fluid to be dispensed. The setting part moves in the distal direction by virtue of the third threaded connection when the amount of injection fluid to be dispensed is being set. The setting part can move in the proximal direction when the injection fluid is pressed out. A latching unit defines a latching position of the setting part and acts between the setting part and housing. Each latching position has an unequivocal rotational position of the setting part in relation to the housing assigned thereto.