Variable Thread Guide Injection Device Dose Setting
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Solution Overview
Problem
Existing injection devices face challenges in robustly and simply setting doses, ensuring accurate substance quantity delivery, providing reliable real-time displays, preventing incorrect operation due to ampoule insertion issues, and accommodating different dose requirements without modifying internal threads.
Innovation Solution
A threaded rod with a cruciform design and engagement elements, a dose setting mechanism with a rotating sleeve and spring, a direct coupling of the display element with the dispensing element, a mechanical lock for ampoule insertion, and an internal thread with multiple contact faces to accommodate various thread pitches.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a threaded rod with engagement regions is used to enable robust dose setting, then the reliability of dose selection is improved, but the device complexity increases due to additional engagement elements and grooves
Solution Approach 1:
The threaded rod is segmented with longitudinal engagement regions and grooves that divide the thread structure into distinct functional zones. These segments allow catch elements to engage at specific positions, providing reliable dose setting while maintaining a relatively simple overall structure.
Solution Approach 2:
Catch elements act as intermediary components between the threaded rod and the setting mechanism. These elements mediate the interaction by engaging with the engagement regions and grooves, enabling robust dose selection without requiring complex direct coupling mechanisms.
2Ease of operation
If the threaded rod is designed with a cruciform cross-section for stable rotated positions, then the ease of operation is improved through defined positioning, but the manufacturing precision requirements increase
Solution Approach 1:
The threaded rod employs a cruciform cross-section with four asymmetric points that create four stable rotated positions (0°, 90°, 180°, 270°). This asymmetric geometry provides tactile feedback and defined positioning during operation, making it easy to set doses without requiring high manufacturing precision beyond standard tolerances.
3Adaptability or versatility
If an internal thread with multiple contact faces is used to accommodate different thread pitches, then the adaptability is improved, but the device complexity increases
Solution Approach 1:
The internal thread is designed with multiple contact faces that can accommodate different external thread pitches. This universal design allows a single injection device to work with various threaded rods for different dose applications, eliminating the need for multiple specialized components and reducing overall system complexity.
4Ease of operation
If chamfered outer regions are provided on the threaded rod to facilitate engagement element movement, then the ease of operation is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The outer regions of the threaded rod are pre-chamfered to create inclined surfaces that facilitate the disengagement of catch elements. This preliminary geometric preparation ensures that when the rod is rotated, the chamfered surfaces automatically guide the catch elements out of the engagement grooves, making the operation smooth and easy without requiring high precision during use.
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
Enables robust dose setting, reliable real-time substance quantity display, prevents incorrect operation by ensuring proper ampoule insertion, and allows for universal use across different dose applications without thread modifications.
Implementation Method 1
a spring element (4), which can be rotated together with the rotating sleeve (2) and which stores a setting energy in a setting state and releases the setting energy in an injected state
Data Source
AI summary
An injection device for injecting a substance from an ampoule inserted in the device, the device including one or more of the following components: an internal thread for engaging a threaded rod, the internal thread including several contact faces enabling the use of a different threaded rods, a real-time display for displaying a quantity of a substance, e.g., the quantity to be injected or dispensed, the quantity available for dispensing or the quantity dispensed, a mechanical lock for locking the device prior to inserting the ampoule, and a claw lock for preventing use of the injection device.