Injection Device Mixing Detection via Accelerometer Feedback
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Solution Overview
Problem
Existing insulin injection devices lack a reliable method to ensure thorough mixing of therapeutic agents before administration, which can lead to incorrect dosages and ineffective insulin delivery due to varying densities of active ingredients or fillers, potentially causing adverse effects such as hypoglycemia in diabetes patients.
Innovation Solution
A method involving a movement sensor, such as a gyro sensor, within the injection device to measure acceleration over time, generating a signal when a predefinable limit value is exceeded, indicating sufficient mixing of the therapeutic agent, ensuring proper administration before injection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If therapeutic agent is stored in ampoule with varying densities of active ingredients or fillers, then separation occurs leading to incorrect dosages, but adding mixing mechanisms increases device complexity
Solution Approach 1:
The patent implements feedback by using an accelerometer to detect mixing movements and a sensor to verify therapeutic agent homogeneity before injection. The system monitors the mixing process in real-time and provides feedback to confirm proper mixing, ensuring dosing accuracy without requiring complex mechanical mixing mechanisms.
Solution Approach 2:
The patent replaces complex mechanical mixing mechanisms with a sensor-based detection system. Instead of using mechanical means to ensure mixing, the invention uses an accelerometer to detect user-performed mixing movements and a sensor to verify therapeutic agent homogeneity, substituting mechanical complexity with electronic sensing and signal processing.
2Reliability
If mixing is not thoroughly performed before injection, then incorrect dosages are administered, but providing clear mixing confirmation increases device complexity
Solution Approach 1:
The system provides feedback to the user through visual or audible signals that confirm proper mixing has been achieved. The control unit processes signals from the accelerometer and sensor, then provides clear confirmation to the user when mixing is sufficient, eliminating ambiguity without requiring complex additional mechanisms.
Solution Approach 2:
The device performs self-verification of mixing by automatically monitoring its own state through the accelerometer and sensor. The system independently determines whether mixing is sufficient and provides confirmation, eliminating the need for external verification methods or complex user assessment procedures.
3Measurement precision
If acceleration threshold is set too low, then false positives occur indicating mixing when insufficient, but setting too high misses adequate mixing
Solution Approach 1:
The system uses feedback from multiple sensors including an accelerometer and additional therapeutic agent sensors to continuously monitor mixing status. The control unit processes this feedback dynamically to adjust the acceleration threshold, ensuring accurate mixing detection without false positives or false negatives.
Solution Approach 2:
The patent implements dynamic parameter changes by adjusting the acceleration threshold based on real-time sensor data and mixing conditions. Instead of using a fixed threshold, the system modifies the threshold parameter adaptively to maintain optimal mixing detection accuracy across varying conditions, resolving the contradiction between sensitivity and reliability.
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
This approach enhances dosing accuracy by confirming adequate mixing of insulin, allowing for precise adjustment of insulin doses based on patient-specific circumstances, thereby reducing the risk of short-term complications like hypoglycemia and improving long-term management of diabetes.
Implementation Method 1
A method is provided involving a movement sensor, such as a gyro sensor, within the injection device to measure acceleration over time
Data Source
AI summary
The invention relates to an injection device (10) for injecting dosed amounts of a liquid therapeutic agent, comprising a receiving system (14) for the therapeutic agent, an application system (16) for transferring the therapeutic agent to an application site, a dosing system (22) for transferring the therapeutic agent from the receiving system (14) to the application system (16), a trigger system (28) for activating the dosing system (22), and a detection system (36) for detecting the amount of the therapeutic agent applied. According to the invention, a sensor arrangement comprises at least one recognition system which detects, prior to injection, whether the therapeutic agent has been mixed.