Fixed Dose Injection Device Trigger Mechanism
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Solution Overview
Problem
Existing injection devices are inconvenient and confusing for users with visual impairments or cognitive deficiencies, particularly when administering repeated doses of medications like rapid-acting insulins or heparin, as they require manual operation and lack simplicity in dose setting.
Innovation Solution
A semi-automatic fixed dose injection device that allows users to set a predetermined dose between 0.01 ml and 0.30 ml, featuring a rotatable gear with evenly spaced teeth and a torsional spring, ensuring accurate and easy delivery of a fixed dose without the need for complex dose adjustments, with features preventing under or over-dosing and providing ergonomic usability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a manual injection device with adjustable dose settings is used, then the device can accommodate different dose requirements, but it becomes confusing and difficult to use for users with visual impairments or cognitive deficiencies
Solution Approach 1:
The patent extracts the dose adjustment capability from the injection device, allowing only a single predetermined fixed dose to be set. This eliminates the complexity of multiple dose settings while maintaining the ability to deliver the required medication amount. The device is designed to deliver only one specific dose, removing the confusing adjustable dial while still meeting the medical need for precise dosing.
Solution Approach 2:
The patent changes the dose parameter from being continuously adjustable to being fixed at a predetermined value. By fixing the dose parameter, the device simplifies the user interface and operation, making it much easier for users with visual or cognitive impairments to use correctly, while still providing the necessary adaptability through the selection of different fixed dose options.
2Measurement precision
If a fixed dose mechanism is implemented, then dosing accuracy is improved, but the device complexity increases due to additional mechanical components
Solution Approach 1:
The patent applies preliminary action by pre-setting the dose during the manufacturing process. The plunger is pre-positioned to deliver a specific fixed dose, and the device is designed to deliver only this predetermined amount. This eliminates the need for complex adjustable mechanisms at the user end, while maintaining high dosing accuracy through the pre-configured mechanical setup.
Solution Approach 2:
The patent employs a disposable injection device design where the entire device, including the fixed dose mechanism, is discarded after a single use. This allows for simpler mechanical construction without the need for complex reusable adjustment mechanisms, as the device is optimized for single-use precision dosing. The disposable nature reduces the complexity requirements while maintaining dosing accuracy.
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 ensures consistent and accurate delivery of a predetermined dose with improved usability, reducing the risk of errors and making it easier for users with dexterity issues or visual impairments to administer medication correctly.
Implementation Method 1
a torsional spring, and a drive shaft; and a trigger connected to the rotatable gear such that when the trigger is activated the torsional spring unwinds and causes the gear wheel to rotate through angle α
Data Source
Figure 1
Figure 2~3
AI summary
A semi-automatic "fixed" dose injection device (1) is disclosed containing a reservoir of medicament, where a trigger (6) controls the unwinding of a torsional spring (18) to cause a predetermined injection of medicament from the reservoir through a disposable needle.